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FFmpeg/libavcodec/mpeg4videodec.c
Andreas Rheinhardt 832ead2ec4 avcodec/mpeg4videodec: Fix data race when initializing VLCs 
Both the MPEG-4 parser as well as the decoder initialized
several VLCs. There is a "static int done = 0;" in order to
guard against initializing these multiple times, but this does
not work when several threads try to initialize these VLCs
concurrently, which can happen when initializing several parsers
at the same time (they don't use the global lock that is used
for codecs without the FF_CODEC_CAP_INIT_THREADSAFE cap; actually,
they don't use any lock at all).

Since ff_mpeg4_decode_picture_header() now aborts early when called
from the parser, it no longer needs to have these VLCs initialized
at all. This commit therefore does exactly this.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-01-09 09:32:53 +01:00

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/*
* MPEG-4 decoder
* Copyright (c) 2000,2001 Fabrice Bellard
* Copyright (c) 2002-2010 Michael Niedermayer <michaelni@gmx.at>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#define UNCHECKED_BITSTREAM_READER 1
#include "libavutil/internal.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "libavutil/thread.h"
#include "error_resilience.h"
#include "hwconfig.h"
#include "idctdsp.h"
#include "internal.h"
#include "mpegutils.h"
#include "mpegvideo.h"
#include "mpegvideodata.h"
#include "mpeg4video.h"
#include "h263.h"
#include "profiles.h"
#include "thread.h"
#include "xvididct.h"
#include "unary.h"
/* The defines below define the number of bits that are read at once for
* reading vlc values. Changing these may improve speed and data cache needs
* be aware though that decreasing them may need the number of stages that is
* passed to get_vlc* to be increased. */
#define SPRITE_TRAJ_VLC_BITS 6
#define DC_VLC_BITS 9
#define MB_TYPE_B_VLC_BITS 4
#define STUDIO_INTRA_BITS 9
static VLC dc_lum, dc_chrom;
static VLC sprite_trajectory;
static VLC mb_type_b_vlc;
static VLC studio_intra_tab[12];
static VLC studio_luma_dc;
static VLC studio_chroma_dc;
static const int mb_type_b_map[4] = {
MB_TYPE_DIRECT2 | MB_TYPE_L0L1,
MB_TYPE_L0L1 | MB_TYPE_16x16,
MB_TYPE_L1 | MB_TYPE_16x16,
MB_TYPE_L0 | MB_TYPE_16x16,
};
/**
* Predict the ac.
* @param n block index (0-3 are luma, 4-5 are chroma)
* @param dir the ac prediction direction
*/
void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n, int dir)
{
int i;
int16_t *ac_val, *ac_val1;
int8_t *const qscale_table = s->current_picture.qscale_table;
/* find prediction */
ac_val = &s->ac_val[0][0][0] + s->block_index[n] * 16;
ac_val1 = ac_val;
if (s->ac_pred) {
if (dir == 0) {
const int xy = s->mb_x - 1 + s->mb_y * s->mb_stride;
/* left prediction */
ac_val -= 16;
if (s->mb_x == 0 || s->qscale == qscale_table[xy] ||
n == 1 || n == 3) {
/* same qscale */
for (i = 1; i < 8; i++)
block[s->idsp.idct_permutation[i << 3]] += ac_val[i];
} else {
/* different qscale, we must rescale */
for (i = 1; i < 8; i++)
block[s->idsp.idct_permutation[i << 3]] += ROUNDED_DIV(ac_val[i] * qscale_table[xy], s->qscale);
}
} else {
const int xy = s->mb_x + s->mb_y * s->mb_stride - s->mb_stride;
/* top prediction */
ac_val -= 16 * s->block_wrap[n];
if (s->mb_y == 0 || s->qscale == qscale_table[xy] ||
n == 2 || n == 3) {
/* same qscale */
for (i = 1; i < 8; i++)
block[s->idsp.idct_permutation[i]] += ac_val[i + 8];
} else {
/* different qscale, we must rescale */
for (i = 1; i < 8; i++)
block[s->idsp.idct_permutation[i]] += ROUNDED_DIV(ac_val[i + 8] * qscale_table[xy], s->qscale);
}
}
}
/* left copy */
for (i = 1; i < 8; i++)
ac_val1[i] = block[s->idsp.idct_permutation[i << 3]];
/* top copy */
for (i = 1; i < 8; i++)
ac_val1[8 + i] = block[s->idsp.idct_permutation[i]];
}
/**
* check if the next stuff is a resync marker or the end.
* @return 0 if not
*/
static inline int mpeg4_is_resync(Mpeg4DecContext *ctx)
{
MpegEncContext *s = &ctx->m;
int bits_count = get_bits_count(&s->gb);
int v = show_bits(&s->gb, 16);
if (s->workaround_bugs & FF_BUG_NO_PADDING && !ctx->resync_marker)
return 0;
while (v <= 0xFF) {
if (s->pict_type == AV_PICTURE_TYPE_B ||
(v >> (8 - s->pict_type) != 1) || s->partitioned_frame)
break;
skip_bits(&s->gb, 8 + s->pict_type);
bits_count += 8 + s->pict_type;
v = show_bits(&s->gb, 16);
}
if (bits_count + 8 >= s->gb.size_in_bits) {
v >>= 8;
v |= 0x7F >> (7 - (bits_count & 7));
if (v == 0x7F)
return s->mb_num;
} else {
if (v == ff_mpeg4_resync_prefix[bits_count & 7]) {
int len, mb_num;
int mb_num_bits = av_log2(s->mb_num - 1) + 1;
GetBitContext gb = s->gb;
skip_bits(&s->gb, 1);
align_get_bits(&s->gb);
for (len = 0; len < 32; len++)
if (get_bits1(&s->gb))
break;
mb_num = get_bits(&s->gb, mb_num_bits);
if (!mb_num || mb_num > s->mb_num || get_bits_count(&s->gb)+6 > s->gb.size_in_bits)
mb_num= -1;
s->gb = gb;
if (len >= ff_mpeg4_get_video_packet_prefix_length(s))
return mb_num;
}
}
return 0;
}
static int mpeg4_decode_sprite_trajectory(Mpeg4DecContext *ctx, GetBitContext *gb)
{
MpegEncContext *s = &ctx->m;
int a = 2 << s->sprite_warping_accuracy;
int rho = 3 - s->sprite_warping_accuracy;
int r = 16 / a;
int alpha = 1;
int beta = 0;
int w = s->width;
int h = s->height;
int min_ab, i, w2, h2, w3, h3;
int sprite_ref[4][2];
int virtual_ref[2][2];
int64_t sprite_offset[2][2];
int64_t sprite_delta[2][2];
// only true for rectangle shapes
const int vop_ref[4][2] = { { 0, 0 }, { s->width, 0 },
{ 0, s->height }, { s->width, s->height } };
int d[4][2] = { { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 } };
if (w <= 0 || h <= 0)
return AVERROR_INVALIDDATA;
for (i = 0; i < ctx->num_sprite_warping_points; i++) {
int length;
int x = 0, y = 0;
length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 2);
if (length > 0)
x = get_xbits(gb, length);
if (!(ctx->divx_version == 500 && ctx->divx_build == 413))
check_marker(s->avctx, gb, "before sprite_trajectory");
length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 2);
if (length > 0)
y = get_xbits(gb, length);
check_marker(s->avctx, gb, "after sprite_trajectory");
ctx->sprite_traj[i][0] = d[i][0] = x;
ctx->sprite_traj[i][1] = d[i][1] = y;
}
for (; i < 4; i++)
ctx->sprite_traj[i][0] = ctx->sprite_traj[i][1] = 0;
while ((1 << alpha) < w)
alpha++;
while ((1 << beta) < h)
beta++; /* typo in the MPEG-4 std for the definition of w' and h' */
w2 = 1 << alpha;
h2 = 1 << beta;
// Note, the 4th point isn't used for GMC
if (ctx->divx_version == 500 && ctx->divx_build == 413) {
sprite_ref[0][0] = a * vop_ref[0][0] + d[0][0];
sprite_ref[0][1] = a * vop_ref[0][1] + d[0][1];
sprite_ref[1][0] = a * vop_ref[1][0] + d[0][0] + d[1][0];
sprite_ref[1][1] = a * vop_ref[1][1] + d[0][1] + d[1][1];
sprite_ref[2][0] = a * vop_ref[2][0] + d[0][0] + d[2][0];
sprite_ref[2][1] = a * vop_ref[2][1] + d[0][1] + d[2][1];
} else {
sprite_ref[0][0] = (a >> 1) * (2 * vop_ref[0][0] + d[0][0]);
sprite_ref[0][1] = (a >> 1) * (2 * vop_ref[0][1] + d[0][1]);
sprite_ref[1][0] = (a >> 1) * (2 * vop_ref[1][0] + d[0][0] + d[1][0]);
sprite_ref[1][1] = (a >> 1) * (2 * vop_ref[1][1] + d[0][1] + d[1][1]);
sprite_ref[2][0] = (a >> 1) * (2 * vop_ref[2][0] + d[0][0] + d[2][0]);
sprite_ref[2][1] = (a >> 1) * (2 * vop_ref[2][1] + d[0][1] + d[2][1]);
}
/* sprite_ref[3][0] = (a >> 1) * (2 * vop_ref[3][0] + d[0][0] + d[1][0] + d[2][0] + d[3][0]);
* sprite_ref[3][1] = (a >> 1) * (2 * vop_ref[3][1] + d[0][1] + d[1][1] + d[2][1] + d[3][1]); */
/* This is mostly identical to the MPEG-4 std (and is totally unreadable
* because of that...). Perhaps it should be reordered to be more readable.
* The idea behind this virtual_ref mess is to be able to use shifts later
* per pixel instead of divides so the distance between points is converted
* from w&h based to w2&h2 based which are of the 2^x form. */
virtual_ref[0][0] = 16 * (vop_ref[0][0] + w2) +
ROUNDED_DIV(((w - w2) *
(r * sprite_ref[0][0] - 16LL * vop_ref[0][0]) +
w2 * (r * sprite_ref[1][0] - 16LL * vop_ref[1][0])), w);
virtual_ref[0][1] = 16 * vop_ref[0][1] +
ROUNDED_DIV(((w - w2) *
(r * sprite_ref[0][1] - 16LL * vop_ref[0][1]) +
w2 * (r * sprite_ref[1][1] - 16LL * vop_ref[1][1])), w);
virtual_ref[1][0] = 16 * vop_ref[0][0] +
ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][0] - 16LL * vop_ref[0][0]) +
h2 * (r * sprite_ref[2][0] - 16LL * vop_ref[2][0])), h);
virtual_ref[1][1] = 16 * (vop_ref[0][1] + h2) +
ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][1] - 16LL * vop_ref[0][1]) +
h2 * (r * sprite_ref[2][1] - 16LL * vop_ref[2][1])), h);
switch (ctx->num_sprite_warping_points) {
case 0:
sprite_offset[0][0] =
sprite_offset[0][1] =
sprite_offset[1][0] =
sprite_offset[1][1] = 0;
sprite_delta[0][0] = a;
sprite_delta[0][1] =
sprite_delta[1][0] = 0;
sprite_delta[1][1] = a;
ctx->sprite_shift[0] =
ctx->sprite_shift[1] = 0;
break;
case 1: // GMC only
sprite_offset[0][0] = sprite_ref[0][0] - a * vop_ref[0][0];
sprite_offset[0][1] = sprite_ref[0][1] - a * vop_ref[0][1];
sprite_offset[1][0] = ((sprite_ref[0][0] >> 1) | (sprite_ref[0][0] & 1)) -
a * (vop_ref[0][0] / 2);
sprite_offset[1][1] = ((sprite_ref[0][1] >> 1) | (sprite_ref[0][1] & 1)) -
a * (vop_ref[0][1] / 2);
sprite_delta[0][0] = a;
sprite_delta[0][1] =
sprite_delta[1][0] = 0;
sprite_delta[1][1] = a;
ctx->sprite_shift[0] =
ctx->sprite_shift[1] = 0;
break;
case 2:
sprite_offset[0][0] = ((int64_t) sprite_ref[0][0] * (1 << alpha + rho)) +
((int64_t) -r * sprite_ref[0][0] + virtual_ref[0][0]) *
((int64_t) -vop_ref[0][0]) +
((int64_t) r * sprite_ref[0][1] - virtual_ref[0][1]) *
((int64_t) -vop_ref[0][1]) + (1 << (alpha + rho - 1));
sprite_offset[0][1] = ((int64_t) sprite_ref[0][1] * (1 << alpha + rho)) +
((int64_t) -r * sprite_ref[0][1] + virtual_ref[0][1]) *
((int64_t) -vop_ref[0][0]) +
((int64_t) -r * sprite_ref[0][0] + virtual_ref[0][0]) *
((int64_t) -vop_ref[0][1]) + (1 << (alpha + rho - 1));
sprite_offset[1][0] = (((int64_t)-r * sprite_ref[0][0] + virtual_ref[0][0]) *
((int64_t)-2 * vop_ref[0][0] + 1) +
((int64_t) r * sprite_ref[0][1] - virtual_ref[0][1]) *
((int64_t)-2 * vop_ref[0][1] + 1) + 2 * w2 * r *
(int64_t) sprite_ref[0][0] - 16 * w2 + (1 << (alpha + rho + 1)));
sprite_offset[1][1] = (((int64_t)-r * sprite_ref[0][1] + virtual_ref[0][1]) *
((int64_t)-2 * vop_ref[0][0] + 1) +
((int64_t)-r * sprite_ref[0][0] + virtual_ref[0][0]) *
((int64_t)-2 * vop_ref[0][1] + 1) + 2 * w2 * r *
(int64_t) sprite_ref[0][1] - 16 * w2 + (1 << (alpha + rho + 1)));
sprite_delta[0][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
sprite_delta[0][1] = (+r * sprite_ref[0][1] - virtual_ref[0][1]);
sprite_delta[1][0] = (-r * sprite_ref[0][1] + virtual_ref[0][1]);
sprite_delta[1][1] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
ctx->sprite_shift[0] = alpha + rho;
ctx->sprite_shift[1] = alpha + rho + 2;
break;
case 3:
min_ab = FFMIN(alpha, beta);
w3 = w2 >> min_ab;
h3 = h2 >> min_ab;
sprite_offset[0][0] = ((int64_t)sprite_ref[0][0] * (1 << (alpha + beta + rho - min_ab))) +
((int64_t)-r * sprite_ref[0][0] + virtual_ref[0][0]) * h3 * (-vop_ref[0][0]) +
((int64_t)-r * sprite_ref[0][0] + virtual_ref[1][0]) * w3 * (-vop_ref[0][1]) +
((int64_t)1 << (alpha + beta + rho - min_ab - 1));
sprite_offset[0][1] = ((int64_t)sprite_ref[0][1] * (1 << (alpha + beta + rho - min_ab))) +
((int64_t)-r * sprite_ref[0][1] + virtual_ref[0][1]) * h3 * (-vop_ref[0][0]) +
((int64_t)-r * sprite_ref[0][1] + virtual_ref[1][1]) * w3 * (-vop_ref[0][1]) +
((int64_t)1 << (alpha + beta + rho - min_ab - 1));
sprite_offset[1][0] = ((int64_t)-r * sprite_ref[0][0] + virtual_ref[0][0]) * h3 * (-2 * vop_ref[0][0] + 1) +
((int64_t)-r * sprite_ref[0][0] + virtual_ref[1][0]) * w3 * (-2 * vop_ref[0][1] + 1) +
(int64_t)2 * w2 * h3 * r * sprite_ref[0][0] - 16 * w2 * h3 +
((int64_t)1 << (alpha + beta + rho - min_ab + 1));
sprite_offset[1][1] = ((int64_t)-r * sprite_ref[0][1] + virtual_ref[0][1]) * h3 * (-2 * vop_ref[0][0] + 1) +
((int64_t)-r * sprite_ref[0][1] + virtual_ref[1][1]) * w3 * (-2 * vop_ref[0][1] + 1) +
(int64_t)2 * w2 * h3 * r * sprite_ref[0][1] - 16 * w2 * h3 +
((int64_t)1 << (alpha + beta + rho - min_ab + 1));
sprite_delta[0][0] = (-r * (int64_t)sprite_ref[0][0] + virtual_ref[0][0]) * h3;
sprite_delta[0][1] = (-r * (int64_t)sprite_ref[0][0] + virtual_ref[1][0]) * w3;
sprite_delta[1][0] = (-r * (int64_t)sprite_ref[0][1] + virtual_ref[0][1]) * h3;
sprite_delta[1][1] = (-r * (int64_t)sprite_ref[0][1] + virtual_ref[1][1]) * w3;
ctx->sprite_shift[0] = alpha + beta + rho - min_ab;
ctx->sprite_shift[1] = alpha + beta + rho - min_ab + 2;
break;
}
/* try to simplify the situation */
if (sprite_delta[0][0] == a << ctx->sprite_shift[0] &&
sprite_delta[0][1] == 0 &&
sprite_delta[1][0] == 0 &&
sprite_delta[1][1] == a << ctx->sprite_shift[0]) {
sprite_offset[0][0] >>= ctx->sprite_shift[0];
sprite_offset[0][1] >>= ctx->sprite_shift[0];
sprite_offset[1][0] >>= ctx->sprite_shift[1];
sprite_offset[1][1] >>= ctx->sprite_shift[1];
sprite_delta[0][0] = a;
sprite_delta[0][1] = 0;
sprite_delta[1][0] = 0;
sprite_delta[1][1] = a;
ctx->sprite_shift[0] = 0;
ctx->sprite_shift[1] = 0;
s->real_sprite_warping_points = 1;
} else {
int shift_y = 16 - ctx->sprite_shift[0];
int shift_c = 16 - ctx->sprite_shift[1];
for (i = 0; i < 2; i++) {
if (shift_c < 0 || shift_y < 0 ||
FFABS( sprite_offset[0][i]) >= INT_MAX >> shift_y ||
FFABS( sprite_offset[1][i]) >= INT_MAX >> shift_c ||
FFABS( sprite_delta[0][i]) >= INT_MAX >> shift_y ||
FFABS( sprite_delta[1][i]) >= INT_MAX >> shift_y
) {
avpriv_request_sample(s->avctx, "Too large sprite shift, delta or offset");
goto overflow;
}
}
for (i = 0; i < 2; i++) {
sprite_offset[0][i] *= 1 << shift_y;
sprite_offset[1][i] *= 1 << shift_c;
sprite_delta[0][i] *= 1 << shift_y;
sprite_delta[1][i] *= 1 << shift_y;
ctx->sprite_shift[i] = 16;
}
for (i = 0; i < 2; i++) {
int64_t sd[2] = {
sprite_delta[i][0] - a * (1LL<<16),
sprite_delta[i][1] - a * (1LL<<16)
};
if (llabs(sprite_offset[0][i] + sprite_delta[i][0] * (w+16LL)) >= INT_MAX ||
llabs(sprite_offset[0][i] + sprite_delta[i][1] * (h+16LL)) >= INT_MAX ||
llabs(sprite_offset[0][i] + sprite_delta[i][0] * (w+16LL) + sprite_delta[i][1] * (h+16LL)) >= INT_MAX ||
llabs(sprite_delta[i][0] * (w+16LL)) >= INT_MAX ||
llabs(sprite_delta[i][1] * (h+16LL)) >= INT_MAX ||
llabs(sd[0]) >= INT_MAX ||
llabs(sd[1]) >= INT_MAX ||
llabs(sprite_offset[0][i] + sd[0] * (w+16LL)) >= INT_MAX ||
llabs(sprite_offset[0][i] + sd[1] * (h+16LL)) >= INT_MAX ||
llabs(sprite_offset[0][i] + sd[0] * (w+16LL) + sd[1] * (h+16LL)) >= INT_MAX
) {
avpriv_request_sample(s->avctx, "Overflow on sprite points");
goto overflow;
}
}
s->real_sprite_warping_points = ctx->num_sprite_warping_points;
}
for (i = 0; i < 4; i++) {
s->sprite_offset[i&1][i>>1] = sprite_offset[i&1][i>>1];
s->sprite_delta [i&1][i>>1] = sprite_delta [i&1][i>>1];
}
return 0;
overflow:
memset(s->sprite_offset, 0, sizeof(s->sprite_offset));
memset(s->sprite_delta, 0, sizeof(s->sprite_delta));
return AVERROR_PATCHWELCOME;
}
static int decode_new_pred(Mpeg4DecContext *ctx, GetBitContext *gb) {
MpegEncContext *s = &ctx->m;
int len = FFMIN(ctx->time_increment_bits + 3, 15);
get_bits(gb, len);
if (get_bits1(gb))
get_bits(gb, len);
check_marker(s->avctx, gb, "after new_pred");
return 0;
}
/**
* Decode the next video packet.
* @return <0 if something went wrong
*/
int ff_mpeg4_decode_video_packet_header(Mpeg4DecContext *ctx)
{
MpegEncContext *s = &ctx->m;
int mb_num_bits = av_log2(s->mb_num - 1) + 1;
int header_extension = 0, mb_num, len;
/* is there enough space left for a video packet + header */
if (get_bits_count(&s->gb) > s->gb.size_in_bits - 20)
return AVERROR_INVALIDDATA;
for (len = 0; len < 32; len++)
if (get_bits1(&s->gb))
break;
if (len != ff_mpeg4_get_video_packet_prefix_length(s)) {
av_log(s->avctx, AV_LOG_ERROR, "marker does not match f_code\n");
return AVERROR_INVALIDDATA;
}
if (ctx->shape != RECT_SHAPE) {
header_extension = get_bits1(&s->gb);
// FIXME more stuff here
}
mb_num = get_bits(&s->gb, mb_num_bits);
if (mb_num >= s->mb_num || !mb_num) {
av_log(s->avctx, AV_LOG_ERROR,
"illegal mb_num in video packet (%d %d) \n", mb_num, s->mb_num);
return AVERROR_INVALIDDATA;
}
s->mb_x = mb_num % s->mb_width;
s->mb_y = mb_num / s->mb_width;
if (ctx->shape != BIN_ONLY_SHAPE) {
int qscale = get_bits(&s->gb, s->quant_precision);
if (qscale)
s->chroma_qscale = s->qscale = qscale;
}
if (ctx->shape == RECT_SHAPE)
header_extension = get_bits1(&s->gb);
if (header_extension) {
int time_incr = 0;
while (get_bits1(&s->gb) != 0)
time_incr++;
check_marker(s->avctx, &s->gb, "before time_increment in video packed header");
skip_bits(&s->gb, ctx->time_increment_bits); /* time_increment */
check_marker(s->avctx, &s->gb, "before vop_coding_type in video packed header");
skip_bits(&s->gb, 2); /* vop coding type */
// FIXME not rect stuff here
if (ctx->shape != BIN_ONLY_SHAPE) {
skip_bits(&s->gb, 3); /* intra dc vlc threshold */
// FIXME don't just ignore everything
if (s->pict_type == AV_PICTURE_TYPE_S &&
ctx->vol_sprite_usage == GMC_SPRITE) {
if (mpeg4_decode_sprite_trajectory(ctx, &s->gb) < 0)
return AVERROR_INVALIDDATA;
av_log(s->avctx, AV_LOG_ERROR, "untested\n");
}
// FIXME reduced res stuff here
if (s->pict_type != AV_PICTURE_TYPE_I) {
int f_code = get_bits(&s->gb, 3); /* fcode_for */
if (f_code == 0)
av_log(s->avctx, AV_LOG_ERROR,
"Error, video packet header damaged (f_code=0)\n");
}
if (s->pict_type == AV_PICTURE_TYPE_B) {
int b_code = get_bits(&s->gb, 3);
if (b_code == 0)
av_log(s->avctx, AV_LOG_ERROR,
"Error, video packet header damaged (b_code=0)\n");
}
}
}
if (ctx->new_pred)
decode_new_pred(ctx, &s->gb);
return 0;
}
static void reset_studio_dc_predictors(MpegEncContext *s)
{
/* Reset DC Predictors */
s->last_dc[0] =
s->last_dc[1] =
s->last_dc[2] = 1 << (s->avctx->bits_per_raw_sample + s->dct_precision + s->intra_dc_precision - 1);
}
/**
* Decode the next video packet.
* @return <0 if something went wrong
*/
int ff_mpeg4_decode_studio_slice_header(Mpeg4DecContext *ctx)
{
MpegEncContext *s = &ctx->m;
GetBitContext *gb = &s->gb;
unsigned vlc_len;
uint16_t mb_num;
if (get_bits_left(gb) >= 32 && get_bits_long(gb, 32) == SLICE_STARTCODE) {
vlc_len = av_log2(s->mb_width * s->mb_height) + 1;
mb_num = get_bits(gb, vlc_len);
if (mb_num >= s->mb_num)
return AVERROR_INVALIDDATA;
s->mb_x = mb_num % s->mb_width;
s->mb_y = mb_num / s->mb_width;
if (ctx->shape != BIN_ONLY_SHAPE)
s->qscale = mpeg_get_qscale(s);
if (get_bits1(gb)) { /* slice_extension_flag */
skip_bits1(gb); /* intra_slice */
skip_bits1(gb); /* slice_VOP_id_enable */
skip_bits(gb, 6); /* slice_VOP_id */
while (get_bits1(gb)) /* extra_bit_slice */
skip_bits(gb, 8); /* extra_information_slice */
}
reset_studio_dc_predictors(s);
}
else {
return AVERROR_INVALIDDATA;
}
return 0;
}
/**
* Get the average motion vector for a GMC MB.
* @param n either 0 for the x component or 1 for y
* @return the average MV for a GMC MB
*/
static inline int get_amv(Mpeg4DecContext *ctx, int n)
{
MpegEncContext *s = &ctx->m;
int x, y, mb_v, sum, dx, dy, shift;
int len = 1 << (s->f_code + 4);
const int a = s->sprite_warping_accuracy;
if (s->workaround_bugs & FF_BUG_AMV)
len >>= s->quarter_sample;
if (s->real_sprite_warping_points == 1) {
if (ctx->divx_version == 500 && ctx->divx_build == 413 && a >= s->quarter_sample)
sum = s->sprite_offset[0][n] / (1 << (a - s->quarter_sample));
else
sum = RSHIFT(s->sprite_offset[0][n] * (1 << s->quarter_sample), a);
} else {
dx = s->sprite_delta[n][0];
dy = s->sprite_delta[n][1];
shift = ctx->sprite_shift[0];
if (n)
dy -= 1 << (shift + a + 1);
else
dx -= 1 << (shift + a + 1);
mb_v = s->sprite_offset[0][n] + dx * s->mb_x * 16U + dy * s->mb_y * 16U;
sum = 0;
for (y = 0; y < 16; y++) {
int v;
v = mb_v + dy * y;
// FIXME optimize
for (x = 0; x < 16; x++) {
sum += v >> shift;
v += dx;
}
}
sum = RSHIFT(sum, a + 8 - s->quarter_sample);
}
if (sum < -len)
sum = -len;
else if (sum >= len)
sum = len - 1;
return sum;
}
/**
* Decode the dc value.
* @param n block index (0-3 are luma, 4-5 are chroma)
* @param dir_ptr the prediction direction will be stored here
* @return the quantized dc
*/
static inline int mpeg4_decode_dc(MpegEncContext *s, int n, int *dir_ptr)
{
int level, code;
if (n < 4)
code = get_vlc2(&s->gb, dc_lum.table, DC_VLC_BITS, 1);
else
code = get_vlc2(&s->gb, dc_chrom.table, DC_VLC_BITS, 1);
if (code < 0 || code > 9 /* && s->nbit < 9 */) {
av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
return AVERROR_INVALIDDATA;
}
if (code == 0) {
level = 0;
} else {
if (IS_3IV1) {
if (code == 1)
level = 2 * get_bits1(&s->gb) - 1;
else {
if (get_bits1(&s->gb))
level = get_bits(&s->gb, code - 1) + (1 << (code - 1));
else
level = -get_bits(&s->gb, code - 1) - (1 << (code - 1));
}
} else {
level = get_xbits(&s->gb, code);
}
if (code > 8) {
if (get_bits1(&s->gb) == 0) { /* marker */
if (s->avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)) {
av_log(s->avctx, AV_LOG_ERROR, "dc marker bit missing\n");
return AVERROR_INVALIDDATA;
}
}
}
}
return ff_mpeg4_pred_dc(s, n, level, dir_ptr, 0);
}
/**
* Decode first partition.
* @return number of MBs decoded or <0 if an error occurred
*/
static int mpeg4_decode_partition_a(Mpeg4DecContext *ctx)
{
MpegEncContext *s = &ctx->m;
int mb_num = 0;
static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
/* decode first partition */
s->first_slice_line = 1;
for (; s->mb_y < s->mb_height; s->mb_y++) {
ff_init_block_index(s);
for (; s->mb_x < s->mb_width; s->mb_x++) {
const int xy = s->mb_x + s->mb_y * s->mb_stride;
int cbpc;
int dir = 0;
mb_num++;
ff_update_block_index(s);
if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
s->first_slice_line = 0;
if (s->pict_type == AV_PICTURE_TYPE_I) {
int i;
do {
if (show_bits(&s->gb, 19) == DC_MARKER)
return mb_num - 1;
cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
if (cbpc < 0) {
av_log(s->avctx, AV_LOG_ERROR,
"mcbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
return AVERROR_INVALIDDATA;
}
} while (cbpc == 8);
s->cbp_table[xy] = cbpc & 3;
s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
s->mb_intra = 1;
if (cbpc & 4)
ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
s->current_picture.qscale_table[xy] = s->qscale;
s->mbintra_table[xy] = 1;
for (i = 0; i < 6; i++) {
int dc_pred_dir;
int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
if (dc < 0) {
av_log(s->avctx, AV_LOG_ERROR,
"DC corrupted at %d %d\n", s->mb_x, s->mb_y);
return dc;
}
dir <<= 1;
if (dc_pred_dir)
dir |= 1;
}
s->pred_dir_table[xy] = dir;
} else { /* P/S_TYPE */
int mx, my, pred_x, pred_y, bits;
int16_t *const mot_val = s->current_picture.motion_val[0][s->block_index[0]];
const int stride = s->b8_stride * 2;
try_again:
bits = show_bits(&s->gb, 17);
if (bits == MOTION_MARKER)
return mb_num - 1;
skip_bits1(&s->gb);
if (bits & 0x10000) {
/* skip mb */
if (s->pict_type == AV_PICTURE_TYPE_S &&
ctx->vol_sprite_usage == GMC_SPRITE) {
s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
MB_TYPE_16x16 |
MB_TYPE_GMC |
MB_TYPE_L0;
mx = get_amv(ctx, 0);
my = get_amv(ctx, 1);
} else {
s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
MB_TYPE_16x16 |
MB_TYPE_L0;
mx = my = 0;
}
mot_val[0] =
mot_val[2] =
mot_val[0 + stride] =
mot_val[2 + stride] = mx;
mot_val[1] =
mot_val[3] =
mot_val[1 + stride] =
mot_val[3 + stride] = my;
if (s->mbintra_table[xy])
ff_clean_intra_table_entries(s);
continue;
}
cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
if (cbpc < 0) {
av_log(s->avctx, AV_LOG_ERROR,
"mcbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
return AVERROR_INVALIDDATA;
}
if (cbpc == 20)
goto try_again;
s->cbp_table[xy] = cbpc & (8 + 3); // 8 is dquant
s->mb_intra = ((cbpc & 4) != 0);
if (s->mb_intra) {
s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
s->mbintra_table[xy] = 1;
mot_val[0] =
mot_val[2] =
mot_val[0 + stride] =
mot_val[2 + stride] = 0;
mot_val[1] =
mot_val[3] =
mot_val[1 + stride] =
mot_val[3 + stride] = 0;
} else {
if (s->mbintra_table[xy])
ff_clean_intra_table_entries(s);
if (s->pict_type == AV_PICTURE_TYPE_S &&
ctx->vol_sprite_usage == GMC_SPRITE &&
(cbpc & 16) == 0)
s->mcsel = get_bits1(&s->gb);
else
s->mcsel = 0;
if ((cbpc & 16) == 0) {
/* 16x16 motion prediction */
ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
if (!s->mcsel) {
mx = ff_h263_decode_motion(s, pred_x, s->f_code);
if (mx >= 0xffff)
return AVERROR_INVALIDDATA;
my = ff_h263_decode_motion(s, pred_y, s->f_code);
if (my >= 0xffff)
return AVERROR_INVALIDDATA;
s->current_picture.mb_type[xy] = MB_TYPE_16x16 |
MB_TYPE_L0;
} else {
mx = get_amv(ctx, 0);
my = get_amv(ctx, 1);
s->current_picture.mb_type[xy] = MB_TYPE_16x16 |
MB_TYPE_GMC |
MB_TYPE_L0;
}
mot_val[0] =
mot_val[2] =
mot_val[0 + stride] =
mot_val[2 + stride] = mx;
mot_val[1] =
mot_val[3] =
mot_val[1 + stride] =
mot_val[3 + stride] = my;
} else {
int i;
s->current_picture.mb_type[xy] = MB_TYPE_8x8 |
MB_TYPE_L0;
for (i = 0; i < 4; i++) {
int16_t *mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
mx = ff_h263_decode_motion(s, pred_x, s->f_code);
if (mx >= 0xffff)
return AVERROR_INVALIDDATA;
my = ff_h263_decode_motion(s, pred_y, s->f_code);
if (my >= 0xffff)
return AVERROR_INVALIDDATA;
mot_val[0] = mx;
mot_val[1] = my;
}
}
}
}
}
s->mb_x = 0;
}
return mb_num;
}
/**
* decode second partition.
* @return <0 if an error occurred
*/
static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count)
{
int mb_num = 0;
static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
s->mb_x = s->resync_mb_x;
s->first_slice_line = 1;
for (s->mb_y = s->resync_mb_y; mb_num < mb_count; s->mb_y++) {
ff_init_block_index(s);
for (; mb_num < mb_count && s->mb_x < s->mb_width; s->mb_x++) {
const int xy = s->mb_x + s->mb_y * s->mb_stride;
mb_num++;
ff_update_block_index(s);
if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1)
s->first_slice_line = 0;
if (s->pict_type == AV_PICTURE_TYPE_I) {
int ac_pred = get_bits1(&s->gb);
int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
if (cbpy < 0) {
av_log(s->avctx, AV_LOG_ERROR,
"cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
return AVERROR_INVALIDDATA;
}
s->cbp_table[xy] |= cbpy << 2;
s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
} else { /* P || S_TYPE */
if (IS_INTRA(s->current_picture.mb_type[xy])) {
int i;
int dir = 0;
int ac_pred = get_bits1(&s->gb);
int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
if (cbpy < 0) {
av_log(s->avctx, AV_LOG_ERROR,
"I cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
return AVERROR_INVALIDDATA;
}
if (s->cbp_table[xy] & 8)
ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
s->current_picture.qscale_table[xy] = s->qscale;
for (i = 0; i < 6; i++) {
int dc_pred_dir;
int dc = mpeg4_decode_dc(s, i, &dc_pred_dir);
if (dc < 0) {
av_log(s->avctx, AV_LOG_ERROR,
"DC corrupted at %d %d\n", s->mb_x, s->mb_y);
return dc;
}
dir <<= 1;
if (dc_pred_dir)
dir |= 1;
}
s->cbp_table[xy] &= 3; // remove dquant
s->cbp_table[xy] |= cbpy << 2;
s->current_picture.mb_type[xy] |= ac_pred * MB_TYPE_ACPRED;
s->pred_dir_table[xy] = dir;
} else if (IS_SKIP(s->current_picture.mb_type[xy])) {
s->current_picture.qscale_table[xy] = s->qscale;
s->cbp_table[xy] = 0;
} else {
int cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
if (cbpy < 0) {
av_log(s->avctx, AV_LOG_ERROR,
"P cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
return AVERROR_INVALIDDATA;
}
if (s->cbp_table[xy] & 8)
ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
s->current_picture.qscale_table[xy] = s->qscale;
s->cbp_table[xy] &= 3; // remove dquant
s->cbp_table[xy] |= (cbpy ^ 0xf) << 2;
}
}
}
if (mb_num >= mb_count)
return 0;
s->mb_x = 0;
}
return 0;
}
/**
* Decode the first and second partition.
* @return <0 if error (and sets error type in the error_status_table)
*/
int ff_mpeg4_decode_partitions(Mpeg4DecContext *ctx)
{
MpegEncContext *s = &ctx->m;
int mb_num;
int ret;
const int part_a_error = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_ERROR | ER_MV_ERROR) : ER_MV_ERROR;
const int part_a_end = s->pict_type == AV_PICTURE_TYPE_I ? (ER_DC_END | ER_MV_END) : ER_MV_END;
mb_num = mpeg4_decode_partition_a(ctx);
if (mb_num <= 0) {
ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
s->mb_x, s->mb_y, part_a_error);
return mb_num ? mb_num : AVERROR_INVALIDDATA;
}
if (s->resync_mb_x + s->resync_mb_y * s->mb_width + mb_num > s->mb_num) {
av_log(s->avctx, AV_LOG_ERROR, "slice below monitor ...\n");
ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
s->mb_x, s->mb_y, part_a_error);
return AVERROR_INVALIDDATA;
}
s->mb_num_left = mb_num;
if (s->pict_type == AV_PICTURE_TYPE_I) {
while (show_bits(&s->gb, 9) == 1)
skip_bits(&s->gb, 9);
if (get_bits(&s->gb, 19) != DC_MARKER) {
av_log(s->avctx, AV_LOG_ERROR,
"marker missing after first I partition at %d %d\n",
s->mb_x, s->mb_y);
return AVERROR_INVALIDDATA;
}
} else {
while (show_bits(&s->gb, 10) == 1)
skip_bits(&s->gb, 10);
if (get_bits(&s->gb, 17) != MOTION_MARKER) {
av_log(s->avctx, AV_LOG_ERROR,
"marker missing after first P partition at %d %d\n",
s->mb_x, s->mb_y);
return AVERROR_INVALIDDATA;
}
}
ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
s->mb_x - 1, s->mb_y, part_a_end);
ret = mpeg4_decode_partition_b(s, mb_num);
if (ret < 0) {
if (s->pict_type == AV_PICTURE_TYPE_P)
ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
s->mb_x, s->mb_y, ER_DC_ERROR);
return ret;
} else {
if (s->pict_type == AV_PICTURE_TYPE_P)
ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
s->mb_x - 1, s->mb_y, ER_DC_END);
}
return 0;
}
/**
* Decode a block.
* @return <0 if an error occurred
*/
static inline int mpeg4_decode_block(Mpeg4DecContext *ctx, int16_t *block,
int n, int coded, int intra, int rvlc)
{
MpegEncContext *s = &ctx->m;
int level, i, last, run, qmul, qadd;
int av_uninit(dc_pred_dir);
RLTable *rl;
RL_VLC_ELEM *rl_vlc;
const uint8_t *scan_table;
// Note intra & rvlc should be optimized away if this is inlined
if (intra) {
if (ctx->use_intra_dc_vlc) {
/* DC coef */
if (s->partitioned_frame) {
level = s->dc_val[0][s->block_index[n]];
if (n < 4)
level = FASTDIV((level + (s->y_dc_scale >> 1)), s->y_dc_scale);
else
level = FASTDIV((level + (s->c_dc_scale >> 1)), s->c_dc_scale);
dc_pred_dir = (s->pred_dir_table[s->mb_x + s->mb_y * s->mb_stride] << n) & 32;
} else {
level = mpeg4_decode_dc(s, n, &dc_pred_dir);
if (level < 0)
return level;
}
block[0] = level;
i = 0;
} else {
i = -1;
ff_mpeg4_pred_dc(s, n, 0, &dc_pred_dir, 0);
}
if (!coded)
goto not_coded;
if (rvlc) {
rl = &ff_rvlc_rl_intra;
rl_vlc = ff_rvlc_rl_intra.rl_vlc[0];
} else {
rl = &ff_mpeg4_rl_intra;
rl_vlc = ff_mpeg4_rl_intra.rl_vlc[0];
}
if (s->ac_pred) {
if (dc_pred_dir == 0)
scan_table = s->intra_v_scantable.permutated; /* left */
else
scan_table = s->intra_h_scantable.permutated; /* top */
} else {
scan_table = s->intra_scantable.permutated;
}
qmul = 1;
qadd = 0;
} else {
i = -1;
if (!coded) {
s->block_last_index[n] = i;
return 0;
}
if (rvlc)
rl = &ff_rvlc_rl_inter;
else
rl = &ff_h263_rl_inter;
scan_table = s->intra_scantable.permutated;
if (s->mpeg_quant) {
qmul = 1;
qadd = 0;
if (rvlc)
rl_vlc = ff_rvlc_rl_inter.rl_vlc[0];
else
rl_vlc = ff_h263_rl_inter.rl_vlc[0];
} else {
qmul = s->qscale << 1;
qadd = (s->qscale - 1) | 1;
if (rvlc)
rl_vlc = ff_rvlc_rl_inter.rl_vlc[s->qscale];
else
rl_vlc = ff_h263_rl_inter.rl_vlc[s->qscale];
}
}
{
OPEN_READER(re, &s->gb);
for (;;) {
UPDATE_CACHE(re, &s->gb);
GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
if (level == 0) {
/* escape */
if (rvlc) {
if (SHOW_UBITS(re, &s->gb, 1) == 0) {
av_log(s->avctx, AV_LOG_ERROR,
"1. marker bit missing in rvlc esc\n");
return AVERROR_INVALIDDATA;
}
SKIP_CACHE(re, &s->gb, 1);
last = SHOW_UBITS(re, &s->gb, 1);
SKIP_CACHE(re, &s->gb, 1);
run = SHOW_UBITS(re, &s->gb, 6);
SKIP_COUNTER(re, &s->gb, 1 + 1 + 6);
UPDATE_CACHE(re, &s->gb);
if (SHOW_UBITS(re, &s->gb, 1) == 0) {
av_log(s->avctx, AV_LOG_ERROR,
"2. marker bit missing in rvlc esc\n");
return AVERROR_INVALIDDATA;
}
SKIP_CACHE(re, &s->gb, 1);
level = SHOW_UBITS(re, &s->gb, 11);
SKIP_CACHE(re, &s->gb, 11);
if (SHOW_UBITS(re, &s->gb, 5) != 0x10) {
av_log(s->avctx, AV_LOG_ERROR, "reverse esc missing\n");
return AVERROR_INVALIDDATA;
}
SKIP_CACHE(re, &s->gb, 5);
level = level * qmul + qadd;
level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
SKIP_COUNTER(re, &s->gb, 1 + 11 + 5 + 1);
i += run + 1;
if (last)
i += 192;
} else {
int cache;
cache = GET_CACHE(re, &s->gb);
if (IS_3IV1)
cache ^= 0xC0000000;
if (cache & 0x80000000) {
if (cache & 0x40000000) {
/* third escape */
SKIP_CACHE(re, &s->gb, 2);
last = SHOW_UBITS(re, &s->gb, 1);
SKIP_CACHE(re, &s->gb, 1);
run = SHOW_UBITS(re, &s->gb, 6);
SKIP_COUNTER(re, &s->gb, 2 + 1 + 6);
UPDATE_CACHE(re, &s->gb);
if (IS_3IV1) {
level = SHOW_SBITS(re, &s->gb, 12);
LAST_SKIP_BITS(re, &s->gb, 12);
} else {
if (SHOW_UBITS(re, &s->gb, 1) == 0) {
av_log(s->avctx, AV_LOG_ERROR,
"1. marker bit missing in 3. esc\n");
if (!(s->avctx->err_recognition & AV_EF_IGNORE_ERR))
return AVERROR_INVALIDDATA;
}
SKIP_CACHE(re, &s->gb, 1);
level = SHOW_SBITS(re, &s->gb, 12);
SKIP_CACHE(re, &s->gb, 12);
if (SHOW_UBITS(re, &s->gb, 1) == 0) {
av_log(s->avctx, AV_LOG_ERROR,
"2. marker bit missing in 3. esc\n");
if (!(s->avctx->err_recognition & AV_EF_IGNORE_ERR))
return AVERROR_INVALIDDATA;
}
SKIP_COUNTER(re, &s->gb, 1 + 12 + 1);
}
#if 0
if (s->error_recognition >= FF_ER_COMPLIANT) {
const int abs_level= FFABS(level);
if (abs_level<=MAX_LEVEL && run<=MAX_RUN) {
const int run1= run - rl->max_run[last][abs_level] - 1;
if (abs_level <= rl->max_level[last][run]) {
av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, vlc encoding possible\n");
return AVERROR_INVALIDDATA;
}
if (s->error_recognition > FF_ER_COMPLIANT) {
if (abs_level <= rl->max_level[last][run]*2) {
av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 1 encoding possible\n");
return AVERROR_INVALIDDATA;
}
if (run1 >= 0 && abs_level <= rl->max_level[last][run1]) {
av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 2 encoding possible\n");
return AVERROR_INVALIDDATA;
}
}
}
}
#endif
if (level > 0)
level = level * qmul + qadd;
else
level = level * qmul - qadd;
if ((unsigned)(level + 2048) > 4095) {
if (s->avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_AGGRESSIVE)) {
if (level > 2560 || level < -2560) {
av_log(s->avctx, AV_LOG_ERROR,
"|level| overflow in 3. esc, qp=%d\n",
s->qscale);
return AVERROR_INVALIDDATA;
}
}
level = level < 0 ? -2048 : 2047;
}
i += run + 1;
if (last)
i += 192;
} else {
/* second escape */
SKIP_BITS(re, &s->gb, 2);
GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
i += run + rl->max_run[run >> 7][level / qmul] + 1; // FIXME opt indexing
level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
LAST_SKIP_BITS(re, &s->gb, 1);
}
} else {
/* first escape */
SKIP_BITS(re, &s->gb, 1);
GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
i += run;
level = level + rl->max_level[run >> 7][(run - 1) & 63] * qmul; // FIXME opt indexing
level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
LAST_SKIP_BITS(re, &s->gb, 1);
}
}
} else {
i += run;
level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
LAST_SKIP_BITS(re, &s->gb, 1);
}
ff_tlog(s->avctx, "dct[%d][%d] = %- 4d end?:%d\n", scan_table[i&63]&7, scan_table[i&63] >> 3, level, i>62);
if (i > 62) {
i -= 192;
if (i & (~63)) {
av_log(s->avctx, AV_LOG_ERROR,
"ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
return AVERROR_INVALIDDATA;
}
block[scan_table[i]] = level;
break;
}
block[scan_table[i]] = level;
}
CLOSE_READER(re, &s->gb);
}
not_coded:
if (intra) {
if (!ctx->use_intra_dc_vlc) {
block[0] = ff_mpeg4_pred_dc(s, n, block[0], &dc_pred_dir, 0);
i -= i >> 31; // if (i == -1) i = 0;
}
ff_mpeg4_pred_ac(s, block, n, dc_pred_dir);
if (s->ac_pred)
i = 63; // FIXME not optimal
}
s->block_last_index[n] = i;
return 0;
}
/**
* decode partition C of one MB.
* @return <0 if an error occurred
*/
static int mpeg4_decode_partitioned_mb(MpegEncContext *s, int16_t block[6][64])
{
Mpeg4DecContext *ctx = s->avctx->priv_data;
int cbp, mb_type;
const int xy = s->mb_x + s->mb_y * s->mb_stride;
av_assert2(s == (void*)ctx);
mb_type = s->current_picture.mb_type[xy];
cbp = s->cbp_table[xy];
ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
if (s->current_picture.qscale_table[xy] != s->qscale)
ff_set_qscale(s, s->current_picture.qscale_table[xy]);
if (s->pict_type == AV_PICTURE_TYPE_P ||
s->pict_type == AV_PICTURE_TYPE_S) {
int i;
for (i = 0; i < 4; i++) {
s->mv[0][i][0] = s->current_picture.motion_val[0][s->block_index[i]][0];
s->mv[0][i][1] = s->current_picture.motion_val[0][s->block_index[i]][1];
}
s->mb_intra = IS_INTRA(mb_type);
if (IS_SKIP(mb_type)) {
/* skip mb */
for (i = 0; i < 6; i++)
s->block_last_index[i] = -1;
s->mv_dir = MV_DIR_FORWARD;
s->mv_type = MV_TYPE_16X16;
if (s->pict_type == AV_PICTURE_TYPE_S
&& ctx->vol_sprite_usage == GMC_SPRITE) {
s->mcsel = 1;
s->mb_skipped = 0;
} else {
s->mcsel = 0;
s->mb_skipped = 1;
}
} else if (s->mb_intra) {
s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]);
} else if (!s->mb_intra) {
// s->mcsel = 0; // FIXME do we need to init that?
s->mv_dir = MV_DIR_FORWARD;
if (IS_8X8(mb_type)) {
s->mv_type = MV_TYPE_8X8;
} else {
s->mv_type = MV_TYPE_16X16;
}
}
} else { /* I-Frame */
s->mb_intra = 1;
s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]);
}
if (!IS_SKIP(mb_type)) {
int i;
s->bdsp.clear_blocks(s->block[0]);
/* decode each block */
for (i = 0; i < 6; i++) {
if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, s->mb_intra, ctx->rvlc) < 0) {
av_log(s->avctx, AV_LOG_ERROR,
"texture corrupted at %d %d %d\n",
s->mb_x, s->mb_y, s->mb_intra);
return AVERROR_INVALIDDATA;
}
cbp += cbp;
}
}
/* per-MB end of slice check */
if (--s->mb_num_left <= 0) {
if (mpeg4_is_resync(ctx))
return SLICE_END;
else
return SLICE_NOEND;
} else {
if (mpeg4_is_resync(ctx)) {
const int delta = s->mb_x + 1 == s->mb_width ? 2 : 1;
if (s->cbp_table[xy + delta])
return SLICE_END;
}
return SLICE_OK;
}
}
static int mpeg4_decode_mb(MpegEncContext *s, int16_t block[6][64])
{
Mpeg4DecContext *ctx = s->avctx->priv_data;
int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
int16_t *mot_val;
static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
const int xy = s->mb_x + s->mb_y * s->mb_stride;
av_assert2(s == (void*)ctx);
av_assert2(s->h263_pred);
if (s->pict_type == AV_PICTURE_TYPE_P ||
s->pict_type == AV_PICTURE_TYPE_S) {
do {
if (get_bits1(&s->gb)) {
/* skip mb */
s->mb_intra = 0;
for (i = 0; i < 6; i++)
s->block_last_index[i] = -1;
s->mv_dir = MV_DIR_FORWARD;
s->mv_type = MV_TYPE_16X16;
if (s->pict_type == AV_PICTURE_TYPE_S &&
ctx->vol_sprite_usage == GMC_SPRITE) {
s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
MB_TYPE_GMC |
MB_TYPE_16x16 |
MB_TYPE_L0;
s->mcsel = 1;
s->mv[0][0][0] = get_amv(ctx, 0);
s->mv[0][0][1] = get_amv(ctx, 1);
s->mb_skipped = 0;
} else {
s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
MB_TYPE_16x16 |
MB_TYPE_L0;
s->mcsel = 0;
s->mv[0][0][0] = 0;
s->mv[0][0][1] = 0;
s->mb_skipped = 1;
}
goto end;
}
cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
if (cbpc < 0) {
av_log(s->avctx, AV_LOG_ERROR,
"mcbpc damaged at %d %d\n", s->mb_x, s->mb_y);
return AVERROR_INVALIDDATA;
}
} while (cbpc == 20);
s->bdsp.clear_blocks(s->block[0]);
dquant = cbpc & 8;
s->mb_intra = ((cbpc & 4) != 0);
if (s->mb_intra)
goto intra;
if (s->pict_type == AV_PICTURE_TYPE_S &&
ctx->vol_sprite_usage == GMC_SPRITE && (cbpc & 16) == 0)
s->mcsel = get_bits1(&s->gb);
else
s->mcsel = 0;
cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1) ^ 0x0F;
if (cbpy < 0) {
av_log(s->avctx, AV_LOG_ERROR,
"P cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
return AVERROR_INVALIDDATA;
}
cbp = (cbpc & 3) | (cbpy << 2);
if (dquant)
ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
if ((!s->progressive_sequence) &&
(cbp || (s->workaround_bugs & FF_BUG_XVID_ILACE)))
s->interlaced_dct = get_bits1(&s->gb);
s->mv_dir = MV_DIR_FORWARD;
if ((cbpc & 16) == 0) {
if (s->mcsel) {
s->current_picture.mb_type[xy] = MB_TYPE_GMC |
MB_TYPE_16x16 |
MB_TYPE_L0;
/* 16x16 global motion prediction */
s->mv_type = MV_TYPE_16X16;
mx = get_amv(ctx, 0);
my = get_amv(ctx, 1);
s->mv[0][0][0] = mx;
s->mv[0][0][1] = my;
} else if ((!s->progressive_sequence) && get_bits1(&s->gb)) {
s->current_picture.mb_type[xy] = MB_TYPE_16x8 |
MB_TYPE_L0 |
MB_TYPE_INTERLACED;
/* 16x8 field motion prediction */
s->mv_type = MV_TYPE_FIELD;
s->field_select[0][0] = get_bits1(&s->gb);
s->field_select[0][1] = get_bits1(&s->gb);
ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
for (i = 0; i < 2; i++) {
mx = ff_h263_decode_motion(s, pred_x, s->f_code);
if (mx >= 0xffff)
return AVERROR_INVALIDDATA;
my = ff_h263_decode_motion(s, pred_y / 2, s->f_code);
if (my >= 0xffff)
return AVERROR_INVALIDDATA;
s->mv[0][i][0] = mx;
s->mv[0][i][1] = my;
}
} else {
s->current_picture.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_L0;
/* 16x16 motion prediction */
s->mv_type = MV_TYPE_16X16;
ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
mx = ff_h263_decode_motion(s, pred_x, s->f_code);
if (mx >= 0xffff)
return AVERROR_INVALIDDATA;
my = ff_h263_decode_motion(s, pred_y, s->f_code);
if (my >= 0xffff)
return AVERROR_INVALIDDATA;
s->mv[0][0][0] = mx;
s->mv[0][0][1] = my;
}
} else {
s->current_picture.mb_type[xy] = MB_TYPE_8x8 | MB_TYPE_L0;
s->mv_type = MV_TYPE_8X8;
for (i = 0; i < 4; i++) {
mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
mx = ff_h263_decode_motion(s, pred_x, s->f_code);
if (mx >= 0xffff)
return AVERROR_INVALIDDATA;
my = ff_h263_decode_motion(s, pred_y, s->f_code);
if (my >= 0xffff)
return AVERROR_INVALIDDATA;
s->mv[0][i][0] = mx;
s->mv[0][i][1] = my;
mot_val[0] = mx;
mot_val[1] = my;
}
}
} else if (s->pict_type == AV_PICTURE_TYPE_B) {
int modb1; // first bit of modb
int modb2; // second bit of modb
int mb_type;
s->mb_intra = 0; // B-frames never contain intra blocks
s->mcsel = 0; // ... true gmc blocks
if (s->mb_x == 0) {
for (i = 0; i < 2; i++) {
s->last_mv[i][0][0] =
s->last_mv[i][0][1] =
s->last_mv[i][1][0] =
s->last_mv[i][1][1] = 0;
}
ff_thread_await_progress(&s->next_picture_ptr->tf, s->mb_y, 0);
}
/* if we skipped it in the future P-frame than skip it now too */
s->mb_skipped = s->next_picture.mbskip_table[s->mb_y * s->mb_stride + s->mb_x]; // Note, skiptab=0 if last was GMC
if (s->mb_skipped) {
/* skip mb */
for (i = 0; i < 6; i++)
s->block_last_index[i] = -1;
s->mv_dir = MV_DIR_FORWARD;
s->mv_type = MV_TYPE_16X16;
s->mv[0][0][0] =
s->mv[0][0][1] =
s->mv[1][0][0] =
s->mv[1][0][1] = 0;
s->current_picture.mb_type[xy] = MB_TYPE_SKIP |
MB_TYPE_16x16 |
MB_TYPE_L0;
goto end;
}
modb1 = get_bits1(&s->gb);
if (modb1) {
// like MB_TYPE_B_DIRECT but no vectors coded
mb_type = MB_TYPE_DIRECT2 | MB_TYPE_SKIP | MB_TYPE_L0L1;
cbp = 0;
} else {
modb2 = get_bits1(&s->gb);
mb_type = get_vlc2(&s->gb, mb_type_b_vlc.table, MB_TYPE_B_VLC_BITS, 1);
if (mb_type < 0) {
av_log(s->avctx, AV_LOG_ERROR, "illegal MB_type\n");
return AVERROR_INVALIDDATA;
}
mb_type = mb_type_b_map[mb_type];
if (modb2) {
cbp = 0;
} else {
s->bdsp.clear_blocks(s->block[0]);
cbp = get_bits(&s->gb, 6);
}
if ((!IS_DIRECT(mb_type)) && cbp) {
if (get_bits1(&s->gb))
ff_set_qscale(s, s->qscale + get_bits1(&s->gb) * 4 - 2);
}
if (!s->progressive_sequence) {
if (cbp)
s->interlaced_dct = get_bits1(&s->gb);
if (!IS_DIRECT(mb_type) && get_bits1(&s->gb)) {
mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
mb_type &= ~MB_TYPE_16x16;
if (USES_LIST(mb_type, 0)) {
s->field_select[0][0] = get_bits1(&s->gb);
s->field_select[0][1] = get_bits1(&s->gb);
}
if (USES_LIST(mb_type, 1)) {
s->field_select[1][0] = get_bits1(&s->gb);
s->field_select[1][1] = get_bits1(&s->gb);
}
}
}
s->mv_dir = 0;
if ((mb_type & (MB_TYPE_DIRECT2 | MB_TYPE_INTERLACED)) == 0) {
s->mv_type = MV_TYPE_16X16;
if (USES_LIST(mb_type, 0)) {
s->mv_dir = MV_DIR_FORWARD;
mx = ff_h263_decode_motion(s, s->last_mv[0][0][0], s->f_code);
my = ff_h263_decode_motion(s, s->last_mv[0][0][1], s->f_code);
s->last_mv[0][1][0] =
s->last_mv[0][0][0] =
s->mv[0][0][0] = mx;
s->last_mv[0][1][1] =
s->last_mv[0][0][1] =
s->mv[0][0][1] = my;
}
if (USES_LIST(mb_type, 1)) {
s->mv_dir |= MV_DIR_BACKWARD;
mx = ff_h263_decode_motion(s, s->last_mv[1][0][0], s->b_code);
my = ff_h263_decode_motion(s, s->last_mv[1][0][1], s->b_code);
s->last_mv[1][1][0] =
s->last_mv[1][0][0] =
s->mv[1][0][0] = mx;
s->last_mv[1][1][1] =
s->last_mv[1][0][1] =
s->mv[1][0][1] = my;
}
} else if (!IS_DIRECT(mb_type)) {
s->mv_type = MV_TYPE_FIELD;
if (USES_LIST(mb_type, 0)) {
s->mv_dir = MV_DIR_FORWARD;
for (i = 0; i < 2; i++) {
mx = ff_h263_decode_motion(s, s->last_mv[0][i][0], s->f_code);
my = ff_h263_decode_motion(s, s->last_mv[0][i][1] / 2, s->f_code);
s->last_mv[0][i][0] =
s->mv[0][i][0] = mx;
s->last_mv[0][i][1] = (s->mv[0][i][1] = my) * 2;
}
}
if (USES_LIST(mb_type, 1)) {
s->mv_dir |= MV_DIR_BACKWARD;
for (i = 0; i < 2; i++) {
mx = ff_h263_decode_motion(s, s->last_mv[1][i][0], s->b_code);
my = ff_h263_decode_motion(s, s->last_mv[1][i][1] / 2, s->b_code);
s->last_mv[1][i][0] =
s->mv[1][i][0] = mx;
s->last_mv[1][i][1] = (s->mv[1][i][1] = my) * 2;
}
}
}
}
if (IS_DIRECT(mb_type)) {
if (IS_SKIP(mb_type)) {
mx =
my = 0;
} else {
mx = ff_h263_decode_motion(s, 0, 1);
my = ff_h263_decode_motion(s, 0, 1);
}
s->mv_dir = MV_DIR_FORWARD | MV_DIR_BACKWARD | MV_DIRECT;
mb_type |= ff_mpeg4_set_direct_mv(s, mx, my);
}
s->current_picture.mb_type[xy] = mb_type;
} else { /* I-Frame */
do {
cbpc = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
if (cbpc < 0) {
av_log(s->avctx, AV_LOG_ERROR,
"I cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
return AVERROR_INVALIDDATA;
}
} while (cbpc == 8);
dquant = cbpc & 4;
s->mb_intra = 1;
intra:
s->ac_pred = get_bits1(&s->gb);
if (s->ac_pred)
s->current_picture.mb_type[xy] = MB_TYPE_INTRA | MB_TYPE_ACPRED;
else
s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
if (cbpy < 0) {
av_log(s->avctx, AV_LOG_ERROR,
"I cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
return AVERROR_INVALIDDATA;
}
cbp = (cbpc & 3) | (cbpy << 2);
ctx->use_intra_dc_vlc = s->qscale < ctx->intra_dc_threshold;
if (dquant)
ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
if (!s->progressive_sequence)
s->interlaced_dct = get_bits1(&s->gb);
s->bdsp.clear_blocks(s->block[0]);
/* decode each block */
for (i = 0; i < 6; i++) {
if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 1, 0) < 0)
return AVERROR_INVALIDDATA;
cbp += cbp;
}
goto end;
}
/* decode each block */
for (i = 0; i < 6; i++) {
if (mpeg4_decode_block(ctx, block[i], i, cbp & 32, 0, 0) < 0)
return AVERROR_INVALIDDATA;
cbp += cbp;
}
end:
/* per-MB end of slice check */
if (s->codec_id == AV_CODEC_ID_MPEG4) {
int next = mpeg4_is_resync(ctx);
if (next) {
if (s->mb_x + s->mb_y*s->mb_width + 1 > next && (s->avctx->err_recognition & AV_EF_AGGRESSIVE)) {
return AVERROR_INVALIDDATA;
} else if (s->mb_x + s->mb_y*s->mb_width + 1 >= next)
return SLICE_END;
if (s->pict_type == AV_PICTURE_TYPE_B) {
const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1;
ff_thread_await_progress(&s->next_picture_ptr->tf,
(s->mb_x + delta >= s->mb_width)
? FFMIN(s->mb_y + 1, s->mb_height - 1)
: s->mb_y, 0);
if (s->next_picture.mbskip_table[xy + delta])
return SLICE_OK;
}
return SLICE_END;
}
}
return SLICE_OK;
}
/* As per spec, studio start code search isn't the same as the old type of start code */
static void next_start_code_studio(GetBitContext *gb)
{
align_get_bits(gb);
while (get_bits_left(gb) >= 24 && show_bits(gb, 24) != 0x1) {
get_bits(gb, 8);
}
}
/* additional_code, vlc index */
static const uint8_t ac_state_tab[22][2] =
{
{0, 0},
{0, 1},
{1, 1},
{2, 1},
{3, 1},
{4, 1},
{5, 1},
{1, 2},
{2, 2},
{3, 2},
{4, 2},
{5, 2},
{6, 2},
{1, 3},
{2, 4},
{3, 5},
{4, 6},
{5, 7},
{6, 8},
{7, 9},
{8, 10},
{0, 11}
};
static int mpeg4_decode_studio_block(MpegEncContext *s, int32_t block[64], int n)
{
Mpeg4DecContext *ctx = s->avctx->priv_data;
int cc, dct_dc_size, dct_diff, code, j, idx = 1, group = 0, run = 0,
additional_code_len, sign, mismatch;
const VLC *cur_vlc = &studio_intra_tab[0];
uint8_t *const scantable = s->intra_scantable.permutated;
const uint16_t *quant_matrix;
uint32_t flc;
const int min = -1 * (1 << (s->avctx->bits_per_raw_sample + 6));
const int max = ((1 << (s->avctx->bits_per_raw_sample + 6)) - 1);
int shift = 3 - s->dct_precision;
mismatch = 1;
memset(block, 0, 64 * sizeof(int32_t));
if (n < 4) {
cc = 0;
dct_dc_size = get_vlc2(&s->gb, studio_luma_dc.table, STUDIO_INTRA_BITS, 2);
quant_matrix = s->intra_matrix;
} else {
cc = (n & 1) + 1;
if (ctx->rgb)
dct_dc_size = get_vlc2(&s->gb, studio_luma_dc.table, STUDIO_INTRA_BITS, 2);
else
dct_dc_size = get_vlc2(&s->gb, studio_chroma_dc.table, STUDIO_INTRA_BITS, 2);
quant_matrix = s->chroma_intra_matrix;
}
if (dct_dc_size == 0) {
dct_diff = 0;
} else {
dct_diff = get_xbits(&s->gb, dct_dc_size);
if (dct_dc_size > 8) {
if(!check_marker(s->avctx, &s->gb, "dct_dc_size > 8"))
return AVERROR_INVALIDDATA;
}
}
s->last_dc[cc] += dct_diff;
if (s->mpeg_quant)
block[0] = s->last_dc[cc] * (8 >> s->intra_dc_precision);
else
block[0] = s->last_dc[cc] * (8 >> s->intra_dc_precision) * (8 >> s->dct_precision);
/* TODO: support mpeg_quant for AC coefficients */
block[0] = av_clip(block[0], min, max);
mismatch ^= block[0];
/* AC Coefficients */
while (1) {
group = get_vlc2(&s->gb, cur_vlc->table, STUDIO_INTRA_BITS, 2);
if (group < 0) {
av_log(s->avctx, AV_LOG_ERROR, "illegal ac coefficient group vlc\n");
return AVERROR_INVALIDDATA;
}
additional_code_len = ac_state_tab[group][0];
cur_vlc = &studio_intra_tab[ac_state_tab[group][1]];
if (group == 0) {
/* End of Block */
break;
} else if (group >= 1 && group <= 6) {
/* Zero run length (Table B.47) */
run = 1 << additional_code_len;
if (additional_code_len)
run += get_bits(&s->gb, additional_code_len);
idx += run;
continue;
} else if (group >= 7 && group <= 12) {
/* Zero run length and +/-1 level (Table B.48) */
code = get_bits(&s->gb, additional_code_len);
sign = code & 1;
code >>= 1;
run = (1 << (additional_code_len - 1)) + code;
idx += run;
if (idx > 63)
return AVERROR_INVALIDDATA;
j = scantable[idx++];
block[j] = sign ? 1 : -1;
} else if (group >= 13 && group <= 20) {
/* Level value (Table B.49) */
if (idx > 63)
return AVERROR_INVALIDDATA;
j = scantable[idx++];
block[j] = get_xbits(&s->gb, additional_code_len);
} else if (group == 21) {
/* Escape */
if (idx > 63)
return AVERROR_INVALIDDATA;
j = scantable[idx++];
additional_code_len = s->avctx->bits_per_raw_sample + s->dct_precision + 4;
flc = get_bits(&s->gb, additional_code_len);
if (flc >> (additional_code_len-1))
block[j] = -1 * (( flc ^ ((1 << additional_code_len) -1)) + 1);
else
block[j] = flc;
}
block[j] = ((block[j] * quant_matrix[j] * s->qscale) * (1 << shift)) / 16;
block[j] = av_clip(block[j], min, max);
mismatch ^= block[j];
}
block[63] ^= mismatch & 1;
return 0;
}
static int mpeg4_decode_dpcm_macroblock(MpegEncContext *s, int16_t macroblock[256], int n)
{
int i, j, w, h, idx = 0;
int block_mean, rice_parameter, rice_prefix_code, rice_suffix_code,
dpcm_residual, left, top, topleft, min_left_top, max_left_top, p, p2, output;
h = 16 >> (n ? s->chroma_y_shift : 0);
w = 16 >> (n ? s->chroma_x_shift : 0);
block_mean = get_bits(&s->gb, s->avctx->bits_per_raw_sample);
if (block_mean == 0){
av_log(s->avctx, AV_LOG_ERROR, "Forbidden block_mean\n");
return AVERROR_INVALIDDATA;
}
s->last_dc[n] = block_mean * (1 << (s->dct_precision + s->intra_dc_precision));
rice_parameter = get_bits(&s->gb, 4);
if (rice_parameter == 0) {
av_log(s->avctx, AV_LOG_ERROR, "Forbidden rice_parameter\n");
return AVERROR_INVALIDDATA;
}
if (rice_parameter == 15)
rice_parameter = 0;
if (rice_parameter > 11) {
av_log(s->avctx, AV_LOG_ERROR, "Forbidden rice_parameter\n");
return AVERROR_INVALIDDATA;
}
for (i = 0; i < h; i++) {
output = 1 << (s->avctx->bits_per_raw_sample - 1);
top = 1 << (s->avctx->bits_per_raw_sample - 1);
for (j = 0; j < w; j++) {
left = output;
topleft = top;
rice_prefix_code = get_unary(&s->gb, 1, 12);
/* Escape */
if (rice_prefix_code == 11)
dpcm_residual = get_bits(&s->gb, s->avctx->bits_per_raw_sample);
else {
if (rice_prefix_code == 12) {
av_log(s->avctx, AV_LOG_ERROR, "Forbidden rice_prefix_code\n");
return AVERROR_INVALIDDATA;
}
rice_suffix_code = get_bitsz(&s->gb, rice_parameter);
dpcm_residual = (rice_prefix_code << rice_parameter) + rice_suffix_code;
}
/* Map to a signed residual */
if (dpcm_residual & 1)
dpcm_residual = (-1 * dpcm_residual) >> 1;
else
dpcm_residual = (dpcm_residual >> 1);
if (i != 0)
top = macroblock[idx-w];
p = left + top - topleft;
min_left_top = FFMIN(left, top);
if (p < min_left_top)
p = min_left_top;
max_left_top = FFMAX(left, top);
if (p > max_left_top)
p = max_left_top;
p2 = (FFMIN(min_left_top, topleft) + FFMAX(max_left_top, topleft)) >> 1;
if (p2 == p)
p2 = block_mean;
if (p2 > p)
dpcm_residual *= -1;
macroblock[idx++] = output = (dpcm_residual + p) & ((1 << s->avctx->bits_per_raw_sample) - 1);
}
}
return 0;
}
static int mpeg4_decode_studio_mb(MpegEncContext *s, int16_t block_[12][64])
{
int i;
s->dpcm_direction = 0;
/* StudioMacroblock */
/* Assumes I-VOP */
s->mb_intra = 1;
if (get_bits1(&s->gb)) { /* compression_mode */
/* DCT */
/* macroblock_type, 1 or 2-bit VLC */
if (!get_bits1(&s->gb)) {
skip_bits1(&s->gb);
s->qscale = mpeg_get_qscale(s);
}
for (i = 0; i < mpeg4_block_count[s->chroma_format]; i++) {
if (mpeg4_decode_studio_block(s, (*s->block32)[i], i) < 0)
return AVERROR_INVALIDDATA;
}
} else {
/* DPCM */
check_marker(s->avctx, &s->gb, "DPCM block start");
s->dpcm_direction = get_bits1(&s->gb) ? -1 : 1;
for (i = 0; i < 3; i++) {
if (mpeg4_decode_dpcm_macroblock(s, (*s->dpcm_macroblock)[i], i) < 0)
return AVERROR_INVALIDDATA;
}
}
if (get_bits_left(&s->gb) >= 24 && show_bits(&s->gb, 23) == 0) {
next_start_code_studio(&s->gb);
return SLICE_END;
}
//vcon-stp9L1.bits (first frame)
if (get_bits_left(&s->gb) == 0)
return SLICE_END;
//vcon-stp2L1.bits, vcon-stp3L1.bits, vcon-stp6L1.bits, vcon-stp7L1.bits, vcon-stp8L1.bits, vcon-stp10L1.bits (first frame)
if (get_bits_left(&s->gb) < 8U && show_bits(&s->gb, get_bits_left(&s->gb)) == 0)
return SLICE_END;
return SLICE_OK;
}
static int mpeg4_decode_gop_header(MpegEncContext *s, GetBitContext *gb)
{
int hours, minutes, seconds;
if (!show_bits(gb, 23)) {
av_log(s->avctx, AV_LOG_WARNING, "GOP header invalid\n");
return AVERROR_INVALIDDATA;
}
hours = get_bits(gb, 5);
minutes = get_bits(gb, 6);
check_marker(s->avctx, gb, "in gop_header");
seconds = get_bits(gb, 6);
s->time_base = seconds + 60*(minutes + 60*hours);
skip_bits1(gb);
skip_bits1(gb);
return 0;
}
static int mpeg4_decode_profile_level(MpegEncContext *s, GetBitContext *gb, int *profile, int *level)
{
*profile = get_bits(gb, 4);
*level = get_bits(gb, 4);
// for Simple profile, level 0
if (*profile == 0 && *level == 8) {
*level = 0;
}
return 0;
}
static int mpeg4_decode_visual_object(MpegEncContext *s, GetBitContext *gb)
{
int visual_object_type;
int is_visual_object_identifier = get_bits1(gb);
if (is_visual_object_identifier) {
skip_bits(gb, 4+3);
}
visual_object_type = get_bits(gb, 4);
if (visual_object_type == VOT_VIDEO_ID ||
visual_object_type == VOT_STILL_TEXTURE_ID) {
int video_signal_type = get_bits1(gb);
if (video_signal_type) {
int video_range, color_description;
skip_bits(gb, 3); // video_format
video_range = get_bits1(gb);
color_description = get_bits1(gb);
s->avctx->color_range = video_range ? AVCOL_RANGE_JPEG : AVCOL_RANGE_MPEG;
if (color_description) {
s->avctx->color_primaries = get_bits(gb, 8);
s->avctx->color_trc = get_bits(gb, 8);
s->avctx->colorspace = get_bits(gb, 8);
}
}
}
return 0;
}
static void mpeg4_load_default_matrices(MpegEncContext *s)
{
int i, v;
/* load default matrices */
for (i = 0; i < 64; i++) {
int j = s->idsp.idct_permutation[i];
v = ff_mpeg4_default_intra_matrix[i];
s->intra_matrix[j] = v;
s->chroma_intra_matrix[j] = v;
v = ff_mpeg4_default_non_intra_matrix[i];
s->inter_matrix[j] = v;
s->chroma_inter_matrix[j] = v;
}
}
static int read_quant_matrix_ext(MpegEncContext *s, GetBitContext *gb)
{
int i, j, v;
if (get_bits1(gb)) {
if (get_bits_left(gb) < 64*8)
return AVERROR_INVALIDDATA;
/* intra_quantiser_matrix */
for (i = 0; i < 64; i++) {
v = get_bits(gb, 8);
j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
s->intra_matrix[j] = v;
s->chroma_intra_matrix[j] = v;
}
}
if (get_bits1(gb)) {
if (get_bits_left(gb) < 64*8)
return AVERROR_INVALIDDATA;
/* non_intra_quantiser_matrix */
for (i = 0; i < 64; i++) {
get_bits(gb, 8);
}
}
if (get_bits1(gb)) {
if (get_bits_left(gb) < 64*8)
return AVERROR_INVALIDDATA;
/* chroma_intra_quantiser_matrix */
for (i = 0; i < 64; i++) {
v = get_bits(gb, 8);
j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
s->chroma_intra_matrix[j] = v;
}
}
if (get_bits1(gb)) {
if (get_bits_left(gb) < 64*8)
return AVERROR_INVALIDDATA;
/* chroma_non_intra_quantiser_matrix */
for (i = 0; i < 64; i++) {
get_bits(gb, 8);
}
}
next_start_code_studio(gb);
return 0;
}
static void extension_and_user_data(MpegEncContext *s, GetBitContext *gb, int id)
{
uint32_t startcode;
uint8_t extension_type;
startcode = show_bits_long(gb, 32);
if (startcode == USER_DATA_STARTCODE || startcode == EXT_STARTCODE) {
if ((id == 2 || id == 4) && startcode == EXT_STARTCODE) {
skip_bits_long(gb, 32);
extension_type = get_bits(gb, 4);
if (extension_type == QUANT_MATRIX_EXT_ID)
read_quant_matrix_ext(s, gb);
}
}
}
static int decode_studio_vol_header(Mpeg4DecContext *ctx, GetBitContext *gb)
{
MpegEncContext *s = &ctx->m;
int width, height;
int bits_per_raw_sample;
int rgb, chroma_format;
// random_accessible_vol and video_object_type_indication have already
// been read by the caller decode_vol_header()
skip_bits(gb, 4); /* video_object_layer_verid */
ctx->shape = get_bits(gb, 2); /* video_object_layer_shape */
skip_bits(gb, 4); /* video_object_layer_shape_extension */
skip_bits1(gb); /* progressive_sequence */
if (ctx->shape != RECT_SHAPE) {
avpriv_request_sample(s->avctx, "MPEG-4 Studio profile non rectangular shape");
return AVERROR_PATCHWELCOME;
}
if (ctx->shape != BIN_ONLY_SHAPE) {
rgb = get_bits1(gb); /* rgb_components */
chroma_format = get_bits(gb, 2); /* chroma_format */
if (!chroma_format || chroma_format == CHROMA_420 || (rgb && chroma_format == CHROMA_422)) {
av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n");
return AVERROR_INVALIDDATA;
}
bits_per_raw_sample = get_bits(gb, 4); /* bit_depth */
if (bits_per_raw_sample == 10) {
if (rgb) {
s->avctx->pix_fmt = AV_PIX_FMT_GBRP10;
} else {
s->avctx->pix_fmt = chroma_format == CHROMA_422 ? AV_PIX_FMT_YUV422P10 : AV_PIX_FMT_YUV444P10;
}
} else {
avpriv_request_sample(s->avctx, "MPEG-4 Studio profile bit-depth %u", bits_per_raw_sample);
return AVERROR_PATCHWELCOME;
}
if (rgb != ctx->rgb || s->chroma_format != chroma_format)
s->context_reinit = 1;
s->avctx->bits_per_raw_sample = bits_per_raw_sample;
ctx->rgb = rgb;
s->chroma_format = chroma_format;
}
if (ctx->shape == RECT_SHAPE) {
check_marker(s->avctx, gb, "before video_object_layer_width");
width = get_bits(gb, 14); /* video_object_layer_width */
check_marker(s->avctx, gb, "before video_object_layer_height");
height = get_bits(gb, 14); /* video_object_layer_height */
check_marker(s->avctx, gb, "after video_object_layer_height");
/* Do the same check as non-studio profile */
if (width && height) {
if (s->width && s->height &&
(s->width != width || s->height != height))
s->context_reinit = 1;
s->width = width;
s->height = height;
}
}
s->aspect_ratio_info = get_bits(gb, 4);
if (s->aspect_ratio_info == FF_ASPECT_EXTENDED) {
s->avctx->sample_aspect_ratio.num = get_bits(gb, 8); // par_width
s->avctx->sample_aspect_ratio.den = get_bits(gb, 8); // par_height
} else {
s->avctx->sample_aspect_ratio = ff_h263_pixel_aspect[s->aspect_ratio_info];
}
skip_bits(gb, 4); /* frame_rate_code */
skip_bits(gb, 15); /* first_half_bit_rate */
check_marker(s->avctx, gb, "after first_half_bit_rate");
skip_bits(gb, 15); /* latter_half_bit_rate */
check_marker(s->avctx, gb, "after latter_half_bit_rate");
skip_bits(gb, 15); /* first_half_vbv_buffer_size */
check_marker(s->avctx, gb, "after first_half_vbv_buffer_size");
skip_bits(gb, 3); /* latter_half_vbv_buffer_size */
skip_bits(gb, 11); /* first_half_vbv_buffer_size */
check_marker(s->avctx, gb, "after first_half_vbv_buffer_size");
skip_bits(gb, 15); /* latter_half_vbv_occupancy */
check_marker(s->avctx, gb, "after latter_half_vbv_occupancy");
s->low_delay = get_bits1(gb);
s->mpeg_quant = get_bits1(gb); /* mpeg2_stream */
next_start_code_studio(gb);
extension_and_user_data(s, gb, 2);
return 0;
}
static int decode_vol_header(Mpeg4DecContext *ctx, GetBitContext *gb)
{
MpegEncContext *s = &ctx->m;
int width, height, vo_ver_id;
/* vol header */
skip_bits(gb, 1); /* random access */
s->vo_type = get_bits(gb, 8);
/* If we are in studio profile (per vo_type), check if its all consistent
* and if so continue pass control to decode_studio_vol_header().
* elIf something is inconsistent, error out
* else continue with (non studio) vol header decpoding.
*/
if (s->vo_type == CORE_STUDIO_VO_TYPE ||
s->vo_type == SIMPLE_STUDIO_VO_TYPE) {
if (s->avctx->profile != FF_PROFILE_UNKNOWN && s->avctx->profile != FF_PROFILE_MPEG4_SIMPLE_STUDIO)
return AVERROR_INVALIDDATA;
s->studio_profile = 1;
s->avctx->profile = FF_PROFILE_MPEG4_SIMPLE_STUDIO;
return decode_studio_vol_header(ctx, gb);
} else if (s->studio_profile) {
return AVERROR_PATCHWELCOME;
}
if (get_bits1(gb) != 0) { /* is_ol_id */
vo_ver_id = get_bits(gb, 4); /* vo_ver_id */
skip_bits(gb, 3); /* vo_priority */
} else {
vo_ver_id = 1;
}
s->aspect_ratio_info = get_bits(gb, 4);
if (s->aspect_ratio_info == FF_ASPECT_EXTENDED) {
s->avctx->sample_aspect_ratio.num = get_bits(gb, 8); // par_width
s->avctx->sample_aspect_ratio.den = get_bits(gb, 8); // par_height
} else {
s->avctx->sample_aspect_ratio = ff_h263_pixel_aspect[s->aspect_ratio_info];
}
if ((ctx->vol_control_parameters = get_bits1(gb))) { /* vol control parameter */
int chroma_format = get_bits(gb, 2);
if (chroma_format != CHROMA_420)
av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n");
s->low_delay = get_bits1(gb);
if (get_bits1(gb)) { /* vbv parameters */
get_bits(gb, 15); /* first_half_bitrate */
check_marker(s->avctx, gb, "after first_half_bitrate");
get_bits(gb, 15); /* latter_half_bitrate */
check_marker(s->avctx, gb, "after latter_half_bitrate");
get_bits(gb, 15); /* first_half_vbv_buffer_size */
check_marker(s->avctx, gb, "after first_half_vbv_buffer_size");
get_bits(gb, 3); /* latter_half_vbv_buffer_size */
get_bits(gb, 11); /* first_half_vbv_occupancy */
check_marker(s->avctx, gb, "after first_half_vbv_occupancy");
get_bits(gb, 15); /* latter_half_vbv_occupancy */
check_marker(s->avctx, gb, "after latter_half_vbv_occupancy");
}
} else {
/* is setting low delay flag only once the smartest thing to do?
* low delay detection will not be overridden. */
if (s->picture_number == 0) {
switch(s->vo_type) {
case SIMPLE_VO_TYPE:
case ADV_SIMPLE_VO_TYPE:
s->low_delay = 1;
break;
default:
s->low_delay = 0;
}
}
}
ctx->shape = get_bits(gb, 2); /* vol shape */
if (ctx->shape != RECT_SHAPE)
av_log(s->avctx, AV_LOG_ERROR, "only rectangular vol supported\n");
if (ctx->shape == GRAY_SHAPE && vo_ver_id != 1) {
av_log(s->avctx, AV_LOG_ERROR, "Gray shape not supported\n");
skip_bits(gb, 4); /* video_object_layer_shape_extension */
}
check_marker(s->avctx, gb, "before time_increment_resolution");
s->avctx->framerate.num = get_bits(gb, 16);
if (!s->avctx->framerate.num) {
av_log(s->avctx, AV_LOG_ERROR, "framerate==0\n");
return AVERROR_INVALIDDATA;
}
ctx->time_increment_bits = av_log2(s->avctx->framerate.num - 1) + 1;
if (ctx->time_increment_bits < 1)
ctx->time_increment_bits = 1;
check_marker(s->avctx, gb, "before fixed_vop_rate");
if (get_bits1(gb) != 0) /* fixed_vop_rate */
s->avctx->framerate.den = get_bits(gb, ctx->time_increment_bits);
else
s->avctx->framerate.den = 1;
s->avctx->time_base = av_inv_q(av_mul_q(s->avctx->framerate, (AVRational){s->avctx->ticks_per_frame, 1}));
ctx->t_frame = 0;
if (ctx->shape != BIN_ONLY_SHAPE) {
if (ctx->shape == RECT_SHAPE) {
check_marker(s->avctx, gb, "before width");
width = get_bits(gb, 13);
check_marker(s->avctx, gb, "before height");
height = get_bits(gb, 13);
check_marker(s->avctx, gb, "after height");
if (width && height && /* they should be non zero but who knows */
!(s->width && s->codec_tag == AV_RL32("MP4S"))) {
if (s->width && s->height &&
(s->width != width || s->height != height))
s->context_reinit = 1;
s->width = width;
s->height = height;
}
}
s->progressive_sequence =
s->progressive_frame = get_bits1(gb) ^ 1;
s->interlaced_dct = 0;
if (!get_bits1(gb) && (s->avctx->debug & FF_DEBUG_PICT_INFO))
av_log(s->avctx, AV_LOG_INFO, /* OBMC Disable */
"MPEG-4 OBMC not supported (very likely buggy encoder)\n");
if (vo_ver_id == 1)
ctx->vol_sprite_usage = get_bits1(gb); /* vol_sprite_usage */
else
ctx->vol_sprite_usage = get_bits(gb, 2); /* vol_sprite_usage */
if (ctx->vol_sprite_usage == STATIC_SPRITE)
av_log(s->avctx, AV_LOG_ERROR, "Static Sprites not supported\n");
if (ctx->vol_sprite_usage == STATIC_SPRITE ||
ctx->vol_sprite_usage == GMC_SPRITE) {
if (ctx->vol_sprite_usage == STATIC_SPRITE) {
skip_bits(gb, 13); // sprite_width
check_marker(s->avctx, gb, "after sprite_width");
skip_bits(gb, 13); // sprite_height
check_marker(s->avctx, gb, "after sprite_height");
skip_bits(gb, 13); // sprite_left
check_marker(s->avctx, gb, "after sprite_left");
skip_bits(gb, 13); // sprite_top
check_marker(s->avctx, gb, "after sprite_top");
}
ctx->num_sprite_warping_points = get_bits(gb, 6);
if (ctx->num_sprite_warping_points > 3) {
av_log(s->avctx, AV_LOG_ERROR,
"%d sprite_warping_points\n",
ctx->num_sprite_warping_points);
ctx->num_sprite_warping_points = 0;
return AVERROR_INVALIDDATA;
}
s->sprite_warping_accuracy = get_bits(gb, 2);
ctx->sprite_brightness_change = get_bits1(gb);
if (ctx->vol_sprite_usage == STATIC_SPRITE)
skip_bits1(gb); // low_latency_sprite
}
// FIXME sadct disable bit if verid!=1 && shape not rect
if (get_bits1(gb) == 1) { /* not_8_bit */
s->quant_precision = get_bits(gb, 4); /* quant_precision */
if (get_bits(gb, 4) != 8) /* bits_per_pixel */
av_log(s->avctx, AV_LOG_ERROR, "N-bit not supported\n");
if (s->quant_precision != 5)
av_log(s->avctx, AV_LOG_ERROR,
"quant precision %d\n", s->quant_precision);
if (s->quant_precision<3 || s->quant_precision>9) {
s->quant_precision = 5;
}
} else {
s->quant_precision = 5;
}
// FIXME a bunch of grayscale shape things
if ((s->mpeg_quant = get_bits1(gb))) { /* vol_quant_type */
int i, v;
mpeg4_load_default_matrices(s);
/* load custom intra matrix */
if (get_bits1(gb)) {
int last = 0;
for (i = 0; i < 64; i++) {
int j;
if (get_bits_left(gb) < 8) {
av_log(s->avctx, AV_LOG_ERROR, "insufficient data for custom matrix\n");
return AVERROR_INVALIDDATA;
}
v = get_bits(gb, 8);
if (v == 0)
break;
last = v;
j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
s->intra_matrix[j] = last;
s->chroma_intra_matrix[j] = last;
}
/* replicate last value */
for (; i < 64; i++) {
int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
s->intra_matrix[j] = last;
s->chroma_intra_matrix[j] = last;
}
}
/* load custom non intra matrix */
if (get_bits1(gb)) {
int last = 0;
for (i = 0; i < 64; i++) {
int j;
if (get_bits_left(gb) < 8) {
av_log(s->avctx, AV_LOG_ERROR, "insufficient data for custom matrix\n");
return AVERROR_INVALIDDATA;
}
v = get_bits(gb, 8);
if (v == 0)
break;
last = v;
j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
s->inter_matrix[j] = v;
s->chroma_inter_matrix[j] = v;
}
/* replicate last value */
for (; i < 64; i++) {
int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
s->inter_matrix[j] = last;
s->chroma_inter_matrix[j] = last;
}
}
// FIXME a bunch of grayscale shape things
}
if (vo_ver_id != 1)
s->quarter_sample = get_bits1(gb);
else
s->quarter_sample = 0;
if (get_bits_left(gb) < 4) {
av_log(s->avctx, AV_LOG_ERROR, "VOL Header truncated\n");
return AVERROR_INVALIDDATA;
}
if (!get_bits1(gb)) {
int pos = get_bits_count(gb);
int estimation_method = get_bits(gb, 2);
if (estimation_method < 2) {
if (!get_bits1(gb)) {
ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* opaque */
ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* transparent */
ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_cae */
ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* inter_cae */
ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* no_update */
ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* upsampling */
}
if (!get_bits1(gb)) {
ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* intra_blocks */
ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter_blocks */
ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* inter4v_blocks */
ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* not coded blocks */
}
if (!check_marker(s->avctx, gb, "in complexity estimation part 1")) {
skip_bits_long(gb, pos - get_bits_count(gb));
goto no_cplx_est;
}
if (!get_bits1(gb)) {
ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_coeffs */
ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* dct_lines */
ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* vlc_syms */
ctx->cplx_estimation_trash_i += 4 * get_bits1(gb); /* vlc_bits */
}
if (!get_bits1(gb)) {
ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* apm */
ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* npm */
ctx->cplx_estimation_trash_b += 8 * get_bits1(gb); /* interpolate_mc_q */
ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* forwback_mc_q */
ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel2 */
ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* halfpel4 */
}
if (!check_marker(s->avctx, gb, "in complexity estimation part 2")) {
skip_bits_long(gb, pos - get_bits_count(gb));
goto no_cplx_est;
}
if (estimation_method == 1) {
ctx->cplx_estimation_trash_i += 8 * get_bits1(gb); /* sadct */
ctx->cplx_estimation_trash_p += 8 * get_bits1(gb); /* qpel */
}
} else
av_log(s->avctx, AV_LOG_ERROR,
"Invalid Complexity estimation method %d\n",
estimation_method);
} else {
no_cplx_est:
ctx->cplx_estimation_trash_i =
ctx->cplx_estimation_trash_p =
ctx->cplx_estimation_trash_b = 0;
}
ctx->resync_marker = !get_bits1(gb); /* resync_marker_disabled */
s->data_partitioning = get_bits1(gb);
if (s->data_partitioning)
ctx->rvlc = get_bits1(gb);
if (vo_ver_id != 1) {
ctx->new_pred = get_bits1(gb);
if (ctx->new_pred) {
av_log(s->avctx, AV_LOG_ERROR, "new pred not supported\n");
skip_bits(gb, 2); /* requested upstream message type */
skip_bits1(gb); /* newpred segment type */
}
if (get_bits1(gb)) // reduced_res_vop
av_log(s->avctx, AV_LOG_ERROR,
"reduced resolution VOP not supported\n");
} else {
ctx->new_pred = 0;
}
ctx->scalability = get_bits1(gb);
if (ctx->scalability) {
GetBitContext bak = *gb;
int h_sampling_factor_n;
int h_sampling_factor_m;
int v_sampling_factor_n;
int v_sampling_factor_m;
skip_bits1(gb); // hierarchy_type
skip_bits(gb, 4); /* ref_layer_id */
skip_bits1(gb); /* ref_layer_sampling_dir */
h_sampling_factor_n = get_bits(gb, 5);
h_sampling_factor_m = get_bits(gb, 5);
v_sampling_factor_n = get_bits(gb, 5);
v_sampling_factor_m = get_bits(gb, 5);
ctx->enhancement_type = get_bits1(gb);
if (h_sampling_factor_n == 0 || h_sampling_factor_m == 0 ||
v_sampling_factor_n == 0 || v_sampling_factor_m == 0) {
/* illegal scalability header (VERY broken encoder),
* trying to workaround */
ctx->scalability = 0;
*gb = bak;
} else
av_log(s->avctx, AV_LOG_ERROR, "scalability not supported\n");
// bin shape stuff FIXME
}
}
if (s->avctx->debug&FF_DEBUG_PICT_INFO) {
av_log(s->avctx, AV_LOG_DEBUG, "tb %d/%d, tincrbits:%d, qp_prec:%d, ps:%d, low_delay:%d %s%s%s%s\n",
s->avctx->framerate.den, s->avctx->framerate.num,
ctx->time_increment_bits,
s->quant_precision,
s->progressive_sequence,
s->low_delay,
ctx->scalability ? "scalability " :"" , s->quarter_sample ? "qpel " : "",
s->data_partitioning ? "partition " : "", ctx->rvlc ? "rvlc " : ""
);
}
return 0;
}
/**
* Decode the user data stuff in the header.
* Also initializes divx/xvid/lavc_version/build.
*/
static int decode_user_data(Mpeg4DecContext *ctx, GetBitContext *gb)
{
MpegEncContext *s = &ctx->m;
char buf[256];
int i;
int e;
int ver = 0, build = 0, ver2 = 0, ver3 = 0;
char last;
for (i = 0; i < 255 && get_bits_count(gb) < gb->size_in_bits; i++) {
if (show_bits(gb, 23) == 0)
break;
buf[i] = get_bits(gb, 8);
}
buf[i] = 0;
/* divx detection */
e = sscanf(buf, "DivX%dBuild%d%c", &ver, &build, &last);
if (e < 2)
e = sscanf(buf, "DivX%db%d%c", &ver, &build, &last);
if (e >= 2) {
ctx->divx_version = ver;
ctx->divx_build = build;
s->divx_packed = e == 3 && last == 'p';
}
/* libavcodec detection */
e = sscanf(buf, "FFmpe%*[^b]b%d", &build) + 3;
if (e != 4)
e = sscanf(buf, "FFmpeg v%d.%d.%d / libavcodec build: %d", &ver, &ver2, &ver3, &build);
if (e != 4) {
e = sscanf(buf, "Lavc%d.%d.%d", &ver, &ver2, &ver3) + 1;
if (e > 1) {
if (ver > 0xFFU || ver2 > 0xFFU || ver3 > 0xFFU) {
av_log(s->avctx, AV_LOG_WARNING,
"Unknown Lavc version string encountered, %d.%d.%d; "
"clamping sub-version values to 8-bits.\n",
ver, ver2, ver3);
}
build = ((ver & 0xFF) << 16) + ((ver2 & 0xFF) << 8) + (ver3 & 0xFF);
}
}
if (e != 4) {
if (strcmp(buf, "ffmpeg") == 0)
ctx->lavc_build = 4600;
}
if (e == 4)
ctx->lavc_build = build;
/* Xvid detection */
e = sscanf(buf, "XviD%d", &build);
if (e == 1)
ctx->xvid_build = build;
return 0;
}
int ff_mpeg4_workaround_bugs(AVCodecContext *avctx)
{
Mpeg4DecContext *ctx = avctx->priv_data;
MpegEncContext *s = &ctx->m;
if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1) {
if (s->codec_tag == AV_RL32("XVID") ||
s->codec_tag == AV_RL32("XVIX") ||
s->codec_tag == AV_RL32("RMP4") ||
s->codec_tag == AV_RL32("ZMP4") ||
s->codec_tag == AV_RL32("SIPP"))
ctx->xvid_build = 0;
}
if (ctx->xvid_build == -1 && ctx->divx_version == -1 && ctx->lavc_build == -1)
if (s->codec_tag == AV_RL32("DIVX") && s->vo_type == 0 &&
ctx->vol_control_parameters == 0)
ctx->divx_version = 400; // divx 4
if (ctx->xvid_build >= 0 && ctx->divx_version >= 0) {
ctx->divx_version =
ctx->divx_build = -1;
}
if (s->workaround_bugs & FF_BUG_AUTODETECT) {
if (s->codec_tag == AV_RL32("XVIX"))
s->workaround_bugs |= FF_BUG_XVID_ILACE;
if (s->codec_tag == AV_RL32("UMP4"))
s->workaround_bugs |= FF_BUG_UMP4;
if (ctx->divx_version >= 500 && ctx->divx_build < 1814)
s->workaround_bugs |= FF_BUG_QPEL_CHROMA;
if (ctx->divx_version > 502 && ctx->divx_build < 1814)
s->workaround_bugs |= FF_BUG_QPEL_CHROMA2;
if (ctx->xvid_build <= 3U)
s->padding_bug_score = 256 * 256 * 256 * 64;
if (ctx->xvid_build <= 1U)
s->workaround_bugs |= FF_BUG_QPEL_CHROMA;
if (ctx->xvid_build <= 12U)
s->workaround_bugs |= FF_BUG_EDGE;
if (ctx->xvid_build <= 32U)
s->workaround_bugs |= FF_BUG_DC_CLIP;
#define SET_QPEL_FUNC(postfix1, postfix2) \
s->qdsp.put_ ## postfix1 = ff_put_ ## postfix2; \
s->qdsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2; \
s->qdsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
if (ctx->lavc_build < 4653U)
s->workaround_bugs |= FF_BUG_STD_QPEL;
if (ctx->lavc_build < 4655U)
s->workaround_bugs |= FF_BUG_DIRECT_BLOCKSIZE;
if (ctx->lavc_build < 4670U)
s->workaround_bugs |= FF_BUG_EDGE;
if (ctx->lavc_build <= 4712U)
s->workaround_bugs |= FF_BUG_DC_CLIP;
if ((ctx->lavc_build&0xFF) >= 100) {
if (ctx->lavc_build > 3621476 && ctx->lavc_build < 3752552 &&
(ctx->lavc_build < 3752037 || ctx->lavc_build > 3752191) // 3.2.1+
)
s->workaround_bugs |= FF_BUG_IEDGE;
}
if (ctx->divx_version >= 0)
s->workaround_bugs |= FF_BUG_DIRECT_BLOCKSIZE;
if (ctx->divx_version == 501 && ctx->divx_build == 20020416)
s->padding_bug_score = 256 * 256 * 256 * 64;
if (ctx->divx_version < 500U)
s->workaround_bugs |= FF_BUG_EDGE;
if (ctx->divx_version >= 0)
s->workaround_bugs |= FF_BUG_HPEL_CHROMA;
}
if (s->workaround_bugs & FF_BUG_STD_QPEL) {
SET_QPEL_FUNC(qpel_pixels_tab[0][5], qpel16_mc11_old_c)
SET_QPEL_FUNC(qpel_pixels_tab[0][7], qpel16_mc31_old_c)
SET_QPEL_FUNC(qpel_pixels_tab[0][9], qpel16_mc12_old_c)
SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
SET_QPEL_FUNC(qpel_pixels_tab[1][5], qpel8_mc11_old_c)
SET_QPEL_FUNC(qpel_pixels_tab[1][7], qpel8_mc31_old_c)
SET_QPEL_FUNC(qpel_pixels_tab[1][9], qpel8_mc12_old_c)
SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
}
if (avctx->debug & FF_DEBUG_BUGS)
av_log(s->avctx, AV_LOG_DEBUG,
"bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
s->workaround_bugs, ctx->lavc_build, ctx->xvid_build,
ctx->divx_version, ctx->divx_build, s->divx_packed ? "p" : "");
if (CONFIG_MPEG4_DECODER && ctx->xvid_build >= 0 &&
s->codec_id == AV_CODEC_ID_MPEG4 &&
avctx->idct_algo == FF_IDCT_AUTO) {
avctx->idct_algo = FF_IDCT_XVID;
ff_mpv_idct_init(s);
return 1;
}
return 0;
}
static int decode_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb,
int parse_only)
{
MpegEncContext *s = &ctx->m;
int time_incr, time_increment;
int64_t pts;
s->mcsel = 0;
s->pict_type = get_bits(gb, 2) + AV_PICTURE_TYPE_I; /* pict type: I = 0 , P = 1 */
if (s->pict_type == AV_PICTURE_TYPE_B && s->low_delay &&
ctx->vol_control_parameters == 0 && !(s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)) {
av_log(s->avctx, AV_LOG_ERROR, "low_delay flag set incorrectly, clearing it\n");
s->low_delay = 0;
}
s->partitioned_frame = s->data_partitioning && s->pict_type != AV_PICTURE_TYPE_B;
if (s->partitioned_frame)
s->decode_mb = mpeg4_decode_partitioned_mb;
else
s->decode_mb = mpeg4_decode_mb;
time_incr = 0;
while (get_bits1(gb) != 0)
time_incr++;
check_marker(s->avctx, gb, "before time_increment");
if (ctx->time_increment_bits == 0 ||
!(show_bits(gb, ctx->time_increment_bits + 1) & 1)) {
av_log(s->avctx, AV_LOG_WARNING,
"time_increment_bits %d is invalid in relation to the current bitstream, this is likely caused by a missing VOL header\n", ctx->time_increment_bits);
for (ctx->time_increment_bits = 1;
ctx->time_increment_bits < 16;
ctx->time_increment_bits++) {
if (s->pict_type == AV_PICTURE_TYPE_P ||
(s->pict_type == AV_PICTURE_TYPE_S &&
ctx->vol_sprite_usage == GMC_SPRITE)) {
if ((show_bits(gb, ctx->time_increment_bits + 6) & 0x37) == 0x30)
break;
} else if ((show_bits(gb, ctx->time_increment_bits + 5) & 0x1F) == 0x18)
break;
}
av_log(s->avctx, AV_LOG_WARNING,
"time_increment_bits set to %d bits, based on bitstream analysis\n", ctx->time_increment_bits);
if (s->avctx->framerate.num && 4*s->avctx->framerate.num < 1<<ctx->time_increment_bits) {
s->avctx->framerate.num = 1<<ctx->time_increment_bits;
s->avctx->time_base = av_inv_q(av_mul_q(s->avctx->framerate, (AVRational){s->avctx->ticks_per_frame, 1}));
}
}
if (IS_3IV1)
time_increment = get_bits1(gb); // FIXME investigate further
else
time_increment = get_bits(gb, ctx->time_increment_bits);
if (s->pict_type != AV_PICTURE_TYPE_B) {
s->last_time_base = s->time_base;
s->time_base += time_incr;
s->time = s->time_base * (int64_t)s->avctx->framerate.num + time_increment;
if (s->workaround_bugs & FF_BUG_UMP4) {
if (s->time < s->last_non_b_time) {
/* header is not mpeg-4-compatible, broken encoder,
* trying to workaround */
s->time_base++;
s->time += s->avctx->framerate.num;
}
}
s->pp_time = s->time - s->last_non_b_time;
s->last_non_b_time = s->time;
} else {
s->time = (s->last_time_base + time_incr) * (int64_t)s->avctx->framerate.num + time_increment;
s->pb_time = s->pp_time - (s->last_non_b_time - s->time);
if (s->pp_time <= s->pb_time ||
s->pp_time <= s->pp_time - s->pb_time ||
s->pp_time <= 0) {
/* messed up order, maybe after seeking? skipping current B-frame */
return FRAME_SKIPPED;
}
ff_mpeg4_init_direct_mv(s);
if (ctx->t_frame == 0)
ctx->t_frame = s->pb_time;
if (ctx->t_frame == 0)
ctx->t_frame = 1; // 1/0 protection
s->pp_field_time = (ROUNDED_DIV(s->last_non_b_time, ctx->t_frame) -
ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
s->pb_field_time = (ROUNDED_DIV(s->time, ctx->t_frame) -
ROUNDED_DIV(s->last_non_b_time - s->pp_time, ctx->t_frame)) * 2;
if (s->pp_field_time <= s->pb_field_time || s->pb_field_time <= 1) {
s->pb_field_time = 2;
s->pp_field_time = 4;
if (!s->progressive_sequence)
return FRAME_SKIPPED;
}
}
if (s->avctx->framerate.den)
pts = ROUNDED_DIV(s->time, s->avctx->framerate.den);
else
pts = AV_NOPTS_VALUE;
ff_dlog(s->avctx, "MPEG4 PTS: %"PRId64"\n", pts);
check_marker(s->avctx, gb, "before vop_coded");
/* vop coded */
if (get_bits1(gb) != 1) {
if (s->avctx->debug & FF_DEBUG_PICT_INFO)
av_log(s->avctx, AV_LOG_ERROR, "vop not coded\n");
return FRAME_SKIPPED;
}
if (ctx->new_pred)
decode_new_pred(ctx, gb);
if (ctx->shape != BIN_ONLY_SHAPE &&
(s->pict_type == AV_PICTURE_TYPE_P ||
(s->pict_type == AV_PICTURE_TYPE_S &&
ctx->vol_sprite_usage == GMC_SPRITE))) {
/* rounding type for motion estimation */
s->no_rounding = get_bits1(gb);
} else {
s->no_rounding = 0;
}
// FIXME reduced res stuff
if (ctx->shape != RECT_SHAPE) {
if (ctx->vol_sprite_usage != 1 || s->pict_type != AV_PICTURE_TYPE_I) {
skip_bits(gb, 13); /* width */
check_marker(s->avctx, gb, "after width");
skip_bits(gb, 13); /* height */
check_marker(s->avctx, gb, "after height");
skip_bits(gb, 13); /* hor_spat_ref */
check_marker(s->avctx, gb, "after hor_spat_ref");
skip_bits(gb, 13); /* ver_spat_ref */
}
skip_bits1(gb); /* change_CR_disable */
if (get_bits1(gb) != 0)
skip_bits(gb, 8); /* constant_alpha_value */
}
// FIXME complexity estimation stuff
if (ctx->shape != BIN_ONLY_SHAPE) {
skip_bits_long(gb, ctx->cplx_estimation_trash_i);
if (s->pict_type != AV_PICTURE_TYPE_I)
skip_bits_long(gb, ctx->cplx_estimation_trash_p);
if (s->pict_type == AV_PICTURE_TYPE_B)
skip_bits_long(gb, ctx->cplx_estimation_trash_b);
if (get_bits_left(gb) < 3) {
av_log(s->avctx, AV_LOG_ERROR, "Header truncated\n");
return AVERROR_INVALIDDATA;
}
ctx->intra_dc_threshold = ff_mpeg4_dc_threshold[get_bits(gb, 3)];
if (!s->progressive_sequence) {
s->top_field_first = get_bits1(gb);
s->alternate_scan = get_bits1(gb);
} else
s->alternate_scan = 0;
}
if (s->alternate_scan) {
ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_vertical_scan);
ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
} else {
ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan);
ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
}
/* Skip at this point when only parsing since the remaining
* data is not useful for a parser and requires the
* sprite_trajectory VLC to be initialized. */
if (parse_only)
goto end;
if (s->pict_type == AV_PICTURE_TYPE_S) {
if((ctx->vol_sprite_usage == STATIC_SPRITE ||
ctx->vol_sprite_usage == GMC_SPRITE)) {
if (mpeg4_decode_sprite_trajectory(ctx, gb) < 0)
return AVERROR_INVALIDDATA;
if (ctx->sprite_brightness_change)
av_log(s->avctx, AV_LOG_ERROR,
"sprite_brightness_change not supported\n");
if (ctx->vol_sprite_usage == STATIC_SPRITE)
av_log(s->avctx, AV_LOG_ERROR, "static sprite not supported\n");
} else {
memset(s->sprite_offset, 0, sizeof(s->sprite_offset));
memset(s->sprite_delta, 0, sizeof(s->sprite_delta));
}
}
if (ctx->shape != BIN_ONLY_SHAPE) {
s->chroma_qscale = s->qscale = get_bits(gb, s->quant_precision);
if (s->qscale == 0) {
av_log(s->avctx, AV_LOG_ERROR,
"Error, header damaged or not MPEG-4 header (qscale=0)\n");
return AVERROR_INVALIDDATA; // makes no sense to continue, as there is nothing left from the image then
}
if (s->pict_type != AV_PICTURE_TYPE_I) {
s->f_code = get_bits(gb, 3); /* fcode_for */
if (s->f_code == 0) {
av_log(s->avctx, AV_LOG_ERROR,
"Error, header damaged or not MPEG-4 header (f_code=0)\n");
s->f_code = 1;
return AVERROR_INVALIDDATA; // makes no sense to continue, as there is nothing left from the image then
}
} else
s->f_code = 1;
if (s->pict_type == AV_PICTURE_TYPE_B) {
s->b_code = get_bits(gb, 3);
if (s->b_code == 0) {
av_log(s->avctx, AV_LOG_ERROR,
"Error, header damaged or not MPEG4 header (b_code=0)\n");
s->b_code=1;
return AVERROR_INVALIDDATA; // makes no sense to continue, as the MV decoding will break very quickly
}
} else
s->b_code = 1;
if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
av_log(s->avctx, AV_LOG_DEBUG,
"qp:%d fc:%d,%d %s size:%d pro:%d alt:%d top:%d %spel part:%d resync:%d w:%d a:%d rnd:%d vot:%d%s dc:%d ce:%d/%d/%d time:%"PRId64" tincr:%d\n",
s->qscale, s->f_code, s->b_code,
s->pict_type == AV_PICTURE_TYPE_I ? "I" : (s->pict_type == AV_PICTURE_TYPE_P ? "P" : (s->pict_type == AV_PICTURE_TYPE_B ? "B" : "S")),
gb->size_in_bits,s->progressive_sequence, s->alternate_scan,
s->top_field_first, s->quarter_sample ? "q" : "h",
s->data_partitioning, ctx->resync_marker,
ctx->num_sprite_warping_points, s->sprite_warping_accuracy,
1 - s->no_rounding, s->vo_type,
ctx->vol_control_parameters ? " VOLC" : " ", ctx->intra_dc_threshold,
ctx->cplx_estimation_trash_i, ctx->cplx_estimation_trash_p,
ctx->cplx_estimation_trash_b,
s->time,
time_increment
);
}
if (!ctx->scalability) {
if (ctx->shape != RECT_SHAPE && s->pict_type != AV_PICTURE_TYPE_I)
skip_bits1(gb); // vop shape coding type
} else {
if (ctx->enhancement_type) {
int load_backward_shape = get_bits1(gb);
if (load_backward_shape)
av_log(s->avctx, AV_LOG_ERROR,
"load backward shape isn't supported\n");
}
skip_bits(gb, 2); // ref_select_code
}
}
end:
/* detect buggy encoders which don't set the low_delay flag
* (divx4/xvid/opendivx). Note we cannot detect divx5 without B-frames
* easily (although it's buggy too) */
if (s->vo_type == 0 && ctx->vol_control_parameters == 0 &&
ctx->divx_version == -1 && s->picture_number == 0) {
av_log(s->avctx, AV_LOG_WARNING,
"looks like this file was encoded with (divx4/(old)xvid/opendivx) -> forcing low_delay flag\n");
s->low_delay = 1;
}
s->picture_number++; // better than pic number==0 always ;)
// FIXME add short header support
s->y_dc_scale_table = ff_mpeg4_y_dc_scale_table;
s->c_dc_scale_table = ff_mpeg4_c_dc_scale_table;
if (s->workaround_bugs & FF_BUG_EDGE) {
s->h_edge_pos = s->width;
s->v_edge_pos = s->height;
}
return 0;
}
static void decode_smpte_tc(Mpeg4DecContext *ctx, GetBitContext *gb)
{
MpegEncContext *s = &ctx->m;
skip_bits(gb, 16); /* Time_code[63..48] */
check_marker(s->avctx, gb, "after Time_code[63..48]");
skip_bits(gb, 16); /* Time_code[47..32] */
check_marker(s->avctx, gb, "after Time_code[47..32]");
skip_bits(gb, 16); /* Time_code[31..16] */
check_marker(s->avctx, gb, "after Time_code[31..16]");
skip_bits(gb, 16); /* Time_code[15..0] */
check_marker(s->avctx, gb, "after Time_code[15..0]");
skip_bits(gb, 4); /* reserved_bits */
}
/**
* Decode the next studio vop header.
* @return <0 if something went wrong
*/
static int decode_studio_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb)
{
MpegEncContext *s = &ctx->m;
if (get_bits_left(gb) <= 32)
return 0;
s->partitioned_frame = 0;
s->interlaced_dct = 0;
s->decode_mb = mpeg4_decode_studio_mb;
decode_smpte_tc(ctx, gb);
skip_bits(gb, 10); /* temporal_reference */
skip_bits(gb, 2); /* vop_structure */
s->pict_type = get_bits(gb, 2) + AV_PICTURE_TYPE_I; /* vop_coding_type */
if (get_bits1(gb)) { /* vop_coded */
skip_bits1(gb); /* top_field_first */
skip_bits1(gb); /* repeat_first_field */
s->progressive_frame = get_bits1(gb) ^ 1; /* progressive_frame */
}
if (s->pict_type == AV_PICTURE_TYPE_I) {
if (get_bits1(gb))
reset_studio_dc_predictors(s);
}
if (ctx->shape != BIN_ONLY_SHAPE) {
s->alternate_scan = get_bits1(gb);
s->frame_pred_frame_dct = get_bits1(gb);
s->dct_precision = get_bits(gb, 2);
s->intra_dc_precision = get_bits(gb, 2);
s->q_scale_type = get_bits1(gb);
}
if (s->alternate_scan) {
ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_vertical_scan);
ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
} else {
ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
ff_init_scantable(s->idsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan);
ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
}
mpeg4_load_default_matrices(s);
next_start_code_studio(gb);
extension_and_user_data(s, gb, 4);
return 0;
}
static int decode_studiovisualobject(Mpeg4DecContext *ctx, GetBitContext *gb)
{
MpegEncContext *s = &ctx->m;
int visual_object_type;
skip_bits(gb, 4); /* visual_object_verid */
visual_object_type = get_bits(gb, 4);
if (visual_object_type != VOT_VIDEO_ID) {
avpriv_request_sample(s->avctx, "VO type %u", visual_object_type);
return AVERROR_PATCHWELCOME;
}
next_start_code_studio(gb);
extension_and_user_data(s, gb, 1);
return 0;
}
/**
* Decode MPEG-4 headers.
*
* @param header If set the absence of a VOP is not treated as error; otherwise, it is treated as such.
* @param parse_only If set, things only relevant to a decoder may be skipped;
* furthermore, the VLC tables may be uninitialized.
* @return <0 if an error occurred
* FRAME_SKIPPED if a not coded VOP is found
* 0 else
*/
int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb,
int header, int parse_only)
{
MpegEncContext *s = &ctx->m;
unsigned startcode, v;
int ret;
int vol = 0;
/* search next start code */
align_get_bits(gb);
// If we have not switched to studio profile than we also did not switch bps
// that means something else (like a previous instance) outside set bps which
// would be inconsistant with the currect state, thus reset it
if (!s->studio_profile && s->avctx->bits_per_raw_sample != 8)
s->avctx->bits_per_raw_sample = 0;
if (s->codec_tag == AV_RL32("WV1F") && show_bits(gb, 24) == 0x575630) {
skip_bits(gb, 24);
if (get_bits(gb, 8) == 0xF0)
goto end;
}
startcode = 0xff;
for (;;) {
if (get_bits_count(gb) >= gb->size_in_bits) {
if (gb->size_in_bits == 8 &&
(ctx->divx_version >= 0 || ctx->xvid_build >= 0) || s->codec_tag == AV_RL32("QMP4")) {
av_log(s->avctx, AV_LOG_VERBOSE, "frame skip %d\n", gb->size_in_bits);
return FRAME_SKIPPED; // divx bug
} else if (header && get_bits_count(gb) == gb->size_in_bits) {
return 0; // ordinary return value for parsing of extradata
} else
return AVERROR_INVALIDDATA; // end of stream
}
/* use the bits after the test */
v = get_bits(gb, 8);
startcode = ((startcode << 8) | v) & 0xffffffff;
if ((startcode & 0xFFFFFF00) != 0x100)
continue; // no startcode
if (s->avctx->debug & FF_DEBUG_STARTCODE) {
av_log(s->avctx, AV_LOG_DEBUG, "startcode: %3X ", startcode);
if (startcode <= 0x11F)
av_log(s->avctx, AV_LOG_DEBUG, "Video Object Start");
else if (startcode <= 0x12F)
av_log(s->avctx, AV_LOG_DEBUG, "Video Object Layer Start");
else if (startcode <= 0x13F)
av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
else if (startcode <= 0x15F)
av_log(s->avctx, AV_LOG_DEBUG, "FGS bp start");
else if (startcode <= 0x1AF)
av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
else if (startcode == 0x1B0)
av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq Start");
else if (startcode == 0x1B1)
av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq End");
else if (startcode == 0x1B2)
av_log(s->avctx, AV_LOG_DEBUG, "User Data");
else if (startcode == 0x1B3)
av_log(s->avctx, AV_LOG_DEBUG, "Group of VOP start");
else if (startcode == 0x1B4)
av_log(s->avctx, AV_LOG_DEBUG, "Video Session Error");
else if (startcode == 0x1B5)
av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Start");
else if (startcode == 0x1B6)
av_log(s->avctx, AV_LOG_DEBUG, "Video Object Plane start");
else if (startcode == 0x1B7)
av_log(s->avctx, AV_LOG_DEBUG, "slice start");
else if (startcode == 0x1B8)
av_log(s->avctx, AV_LOG_DEBUG, "extension start");
else if (startcode == 0x1B9)
av_log(s->avctx, AV_LOG_DEBUG, "fgs start");
else if (startcode == 0x1BA)
av_log(s->avctx, AV_LOG_DEBUG, "FBA Object start");
else if (startcode == 0x1BB)
av_log(s->avctx, AV_LOG_DEBUG, "FBA Object Plane start");
else if (startcode == 0x1BC)
av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object start");
else if (startcode == 0x1BD)
av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object Plane start");
else if (startcode == 0x1BE)
av_log(s->avctx, AV_LOG_DEBUG, "Still Texture Object start");
else if (startcode == 0x1BF)
av_log(s->avctx, AV_LOG_DEBUG, "Texture Spatial Layer start");
else if (startcode == 0x1C0)
av_log(s->avctx, AV_LOG_DEBUG, "Texture SNR Layer start");
else if (startcode == 0x1C1)
av_log(s->avctx, AV_LOG_DEBUG, "Texture Tile start");
else if (startcode == 0x1C2)
av_log(s->avctx, AV_LOG_DEBUG, "Texture Shape Layer start");
else if (startcode == 0x1C3)
av_log(s->avctx, AV_LOG_DEBUG, "stuffing start");
else if (startcode <= 0x1C5)
av_log(s->avctx, AV_LOG_DEBUG, "reserved");
else if (startcode <= 0x1FF)
av_log(s->avctx, AV_LOG_DEBUG, "System start");
av_log(s->avctx, AV_LOG_DEBUG, " at %d\n", get_bits_count(gb));
}
if (startcode >= 0x120 && startcode <= 0x12F) {
if (vol) {
av_log(s->avctx, AV_LOG_WARNING, "Ignoring multiple VOL headers\n");
continue;
}
vol++;
if ((ret = decode_vol_header(ctx, gb)) < 0)
return ret;
} else if (startcode == USER_DATA_STARTCODE) {
decode_user_data(ctx, gb);
} else if (startcode == GOP_STARTCODE) {
mpeg4_decode_gop_header(s, gb);
} else if (startcode == VOS_STARTCODE) {
int profile, level;
mpeg4_decode_profile_level(s, gb, &profile, &level);
if (profile == FF_PROFILE_MPEG4_SIMPLE_STUDIO &&
(level > 0 && level < 9)) {
s->studio_profile = 1;
next_start_code_studio(gb);
extension_and_user_data(s, gb, 0);
} else if (s->studio_profile) {
avpriv_request_sample(s->avctx, "Mix of studio and non studio profile");
return AVERROR_PATCHWELCOME;
}
s->avctx->profile = profile;
s->avctx->level = level;
} else if (startcode == VISUAL_OBJ_STARTCODE) {
if (s->studio_profile) {
if ((ret = decode_studiovisualobject(ctx, gb)) < 0)
return ret;
} else
mpeg4_decode_visual_object(s, gb);
} else if (startcode == VOP_STARTCODE) {
break;
}
align_get_bits(gb);
startcode = 0xff;
}
end:
if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
s->low_delay = 1;
s->avctx->has_b_frames = !s->low_delay;
if (s->studio_profile) {
if (!s->avctx->bits_per_raw_sample) {
av_log(s->avctx, AV_LOG_ERROR, "Missing VOL header\n");
return AVERROR_INVALIDDATA;
}
return decode_studio_vop_header(ctx, gb);
} else
return decode_vop_header(ctx, gb, parse_only);
}
int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
{
Mpeg4DecContext *ctx = avctx->priv_data;
MpegEncContext *s = &ctx->m;
/* divx 5.01+ bitstream reorder stuff */
/* Since this clobbers the input buffer and hwaccel codecs still need the
* data during hwaccel->end_frame we should not do this any earlier */
if (s->divx_packed) {
int current_pos = s->gb.buffer == s->bitstream_buffer ? 0 : (get_bits_count(&s->gb) >> 3);
int startcode_found = 0;
if (buf_size - current_pos > 7) {
int i;
for (i = current_pos; i < buf_size - 4; i++)
if (buf[i] == 0 &&
buf[i + 1] == 0 &&
buf[i + 2] == 1 &&
buf[i + 3] == 0xB6) {
startcode_found = !(buf[i + 4] & 0x40);
break;
}
}
if (startcode_found) {
if (!ctx->showed_packed_warning) {
av_log(s->avctx, AV_LOG_INFO, "Video uses a non-standard and "
"wasteful way to store B-frames ('packed B-frames'). "
"Consider using the mpeg4_unpack_bframes bitstream filter without encoding but stream copy to fix it.\n");
ctx->showed_packed_warning = 1;
}
av_fast_padded_malloc(&s->bitstream_buffer,
&s->allocated_bitstream_buffer_size,
buf_size - current_pos);
if (!s->bitstream_buffer) {
s->bitstream_buffer_size = 0;
return AVERROR(ENOMEM);
}
memcpy(s->bitstream_buffer, buf + current_pos,
buf_size - current_pos);
s->bitstream_buffer_size = buf_size - current_pos;
}
}
return 0;
}
#if HAVE_THREADS
static int mpeg4_update_thread_context(AVCodecContext *dst,
const AVCodecContext *src)
{
Mpeg4DecContext *s = dst->priv_data;
const Mpeg4DecContext *s1 = src->priv_data;
int init = s->m.context_initialized;
int ret = ff_mpeg_update_thread_context(dst, src);
if (ret < 0)
return ret;
// copy all the necessary fields explicitly
s->time_increment_bits = s1->time_increment_bits;
s->shape = s1->shape;
s->vol_sprite_usage = s1->vol_sprite_usage;
s->sprite_brightness_change = s1->sprite_brightness_change;
s->num_sprite_warping_points = s1->num_sprite_warping_points;
s->rvlc = s1->rvlc;
s->resync_marker = s1->resync_marker;
s->t_frame = s1->t_frame;
s->new_pred = s1->new_pred;
s->enhancement_type = s1->enhancement_type;
s->scalability = s1->scalability;
s->use_intra_dc_vlc = s1->use_intra_dc_vlc;
s->intra_dc_threshold = s1->intra_dc_threshold;
s->divx_version = s1->divx_version;
s->divx_build = s1->divx_build;
s->xvid_build = s1->xvid_build;
s->lavc_build = s1->lavc_build;
s->showed_packed_warning = s1->showed_packed_warning;
s->vol_control_parameters = s1->vol_control_parameters;
s->cplx_estimation_trash_i = s1->cplx_estimation_trash_i;
s->cplx_estimation_trash_p = s1->cplx_estimation_trash_p;
s->cplx_estimation_trash_b = s1->cplx_estimation_trash_b;
s->rgb = s1->rgb;
memcpy(s->sprite_shift, s1->sprite_shift, sizeof(s1->sprite_shift));
memcpy(s->sprite_traj, s1->sprite_traj, sizeof(s1->sprite_traj));
if (CONFIG_MPEG4_DECODER && !init && s1->xvid_build >= 0)
ff_xvid_idct_init(&s->m.idsp, dst);
return 0;
}
static int mpeg4_update_thread_context_for_user(AVCodecContext *dst,
const AVCodecContext *src)
{
MpegEncContext *m = dst->priv_data;
const MpegEncContext *m1 = src->priv_data;
m->quarter_sample = m1->quarter_sample;
m->divx_packed = m1->divx_packed;
return 0;
}
#endif
static av_cold void mpeg4_init_static(void)
{
static uint8_t mpeg4_rvlc_rl_tables[2][2][2 * MAX_RUN + MAX_LEVEL + 3];
INIT_VLC_STATIC_FROM_LENGTHS(&studio_luma_dc, STUDIO_INTRA_BITS, 19,
&ff_mpeg4_studio_dc_luma[0][1], 2,
&ff_mpeg4_studio_dc_luma[0][0], 2, 1,
0, 0, 528);
INIT_VLC_STATIC_FROM_LENGTHS(&studio_chroma_dc, STUDIO_INTRA_BITS, 19,
&ff_mpeg4_studio_dc_chroma[0][1], 2,
&ff_mpeg4_studio_dc_chroma[0][0], 2, 1,
0, 0, 528);
for (unsigned i = 0, offset = 0; i < 12; i++) {
static VLC_TYPE vlc_buf[6498][2];
studio_intra_tab[i].table = &vlc_buf[offset];
studio_intra_tab[i].table_allocated = FF_ARRAY_ELEMS(vlc_buf) - offset;
ff_init_vlc_from_lengths(&studio_intra_tab[i],
STUDIO_INTRA_BITS, 24,
&ff_mpeg4_studio_intra[i][0][1], 2,
&ff_mpeg4_studio_intra[i][0][0], 2, 1,
0, INIT_VLC_STATIC_OVERLONG, NULL);
offset += studio_intra_tab[i].table_size;
}
ff_mpeg4_init_rl_intra();
ff_rl_init(&ff_rvlc_rl_inter, mpeg4_rvlc_rl_tables[0]);
ff_rl_init(&ff_rvlc_rl_intra, mpeg4_rvlc_rl_tables[1]);
INIT_FIRST_VLC_RL(ff_mpeg4_rl_intra, 554);
INIT_VLC_RL(ff_rvlc_rl_inter, 1072);
INIT_FIRST_VLC_RL(ff_rvlc_rl_intra, 1072);
INIT_VLC_STATIC(&dc_lum, DC_VLC_BITS, 10 /* 13 */,
&ff_mpeg4_DCtab_lum[0][1], 2, 1,
&ff_mpeg4_DCtab_lum[0][0], 2, 1, 512);
INIT_VLC_STATIC(&dc_chrom, DC_VLC_BITS, 10 /* 13 */,
&ff_mpeg4_DCtab_chrom[0][1], 2, 1,
&ff_mpeg4_DCtab_chrom[0][0], 2, 1, 512);
INIT_VLC_STATIC_FROM_LENGTHS(&sprite_trajectory, SPRITE_TRAJ_VLC_BITS, 15,
ff_sprite_trajectory_lens, 1,
NULL, 0, 0, 0, 0, 128);
INIT_VLC_STATIC(&mb_type_b_vlc, MB_TYPE_B_VLC_BITS, 4,
&ff_mb_type_b_tab[0][1], 2, 1,
&ff_mb_type_b_tab[0][0], 2, 1, 16);
}
static av_cold int decode_init(AVCodecContext *avctx)
{
static AVOnce init_static_once = AV_ONCE_INIT;
Mpeg4DecContext *ctx = avctx->priv_data;
MpegEncContext *s = &ctx->m;
int ret;
ctx->divx_version =
ctx->divx_build =
ctx->xvid_build =
ctx->lavc_build = -1;
if ((ret = ff_h263_decode_init(avctx)) < 0)
return ret;
s->h263_pred = 1;
s->low_delay = 0; /* default, might be overridden in the vol header during header parsing */
s->decode_mb = mpeg4_decode_mb;
ctx->time_increment_bits = 4; /* default value for broken headers */
avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
ff_thread_once(&init_static_once, mpeg4_init_static);
return 0;
}
#define OFFSET(x) offsetof(MpegEncContext, x)
#define FLAGS AV_OPT_FLAG_EXPORT | AV_OPT_FLAG_READONLY
static const AVOption mpeg4_options[] = {
{"quarter_sample", "1/4 subpel MC", OFFSET(quarter_sample), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, FLAGS},
{"divx_packed", "divx style packed b frames", OFFSET(divx_packed), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, FLAGS},
{NULL}
};
static const AVClass mpeg4_class = {
.class_name = "MPEG4 Video Decoder",
.item_name = av_default_item_name,
.option = mpeg4_options,
.version = LIBAVUTIL_VERSION_INT,
};
const AVCodec ff_mpeg4_decoder = {
.name = "mpeg4",
.long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_MPEG4,
.priv_data_size = sizeof(Mpeg4DecContext),
.init = decode_init,
.close = ff_h263_decode_end,
.decode = ff_h263_decode_frame,
.capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
#if FF_API_FLAG_TRUNCATED
AV_CODEC_CAP_TRUNCATED |
#endif
AV_CODEC_CAP_DELAY | AV_CODEC_CAP_FRAME_THREADS,
.caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM |
FF_CODEC_CAP_ALLOCATE_PROGRESS,
.flush = ff_mpeg_flush,
.max_lowres = 3,
.pix_fmts = ff_h263_hwaccel_pixfmt_list_420,
.profiles = NULL_IF_CONFIG_SMALL(ff_mpeg4_video_profiles),
.update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg4_update_thread_context),
.update_thread_context_for_user = ONLY_IF_THREADS_ENABLED(mpeg4_update_thread_context_for_user),
.priv_class = &mpeg4_class,
.hw_configs = (const AVCodecHWConfigInternal *const []) {
#if CONFIG_MPEG4_NVDEC_HWACCEL
HWACCEL_NVDEC(mpeg4),
#endif
#if CONFIG_MPEG4_VAAPI_HWACCEL
HWACCEL_VAAPI(mpeg4),
#endif
#if CONFIG_MPEG4_VDPAU_HWACCEL
HWACCEL_VDPAU(mpeg4),
#endif
#if CONFIG_MPEG4_VIDEOTOOLBOX_HWACCEL
HWACCEL_VIDEOTOOLBOX(mpeg4),
#endif
NULL
},
};
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