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FFmpeg/libavcodec/mpeg4videodec.c
Michael Niedermayer 12245ab1f6 avcodec/mpeg4videodec: Check sprite delta upshift against overflowing. 
Fixes: runtime error: signed integer overflow: -268386304 * 16 cannot be represented in type 'int'
Fixes: 2204/clusterfuzz-testcase-minimized-5616756909408256

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
2017-06-15 00:16:20 +02:00

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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 "error_resilience.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"
/* 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
static VLC dc_lum, dc_chrom;
static VLC sprite_trajectory;
static VLC mb_type_b_vlc;
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 = 0;
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];
// 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, 3);
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, 3);
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] - 16 * vop_ref[0][0]) +
w2 * (r * sprite_ref[1][0] - 16 * vop_ref[1][0])), w);
virtual_ref[0][1] = 16 * vop_ref[0][1] +
ROUNDED_DIV(((w - w2) *
(r * sprite_ref[0][1] - 16 * vop_ref[0][1]) +
w2 * (r * sprite_ref[1][1] - 16 * vop_ref[1][1])), w);
virtual_ref[1][0] = 16 * vop_ref[0][0] +
ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][0] - 16 * vop_ref[0][0]) +
h2 * (r * sprite_ref[2][0] - 16 * vop_ref[2][0])), h);
virtual_ref[1][1] = 16 * (vop_ref[0][1] + h2) +
ROUNDED_DIV(((h - h2) * (r * sprite_ref[0][1] - 16 * vop_ref[0][1]) +
h2 * (r * sprite_ref[2][1] - 16 * 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;
s->sprite_delta[0][0] = a;
s->sprite_delta[0][1] =
s->sprite_delta[1][0] = 0;
s->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);
s->sprite_delta[0][0] = a;
s->sprite_delta[0][1] =
s->sprite_delta[1][0] = 0;
s->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)));
s->sprite_delta[0][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]);
s->sprite_delta[0][1] = (+r * sprite_ref[0][1] - virtual_ref[0][1]);
s->sprite_delta[1][0] = (-r * sprite_ref[0][1] + virtual_ref[0][1]);
s->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));
s->sprite_delta[0][0] = (-r * sprite_ref[0][0] + virtual_ref[0][0]) * h3;
s->sprite_delta[0][1] = (-r * sprite_ref[0][0] + virtual_ref[1][0]) * w3;
s->sprite_delta[1][0] = (-r * sprite_ref[0][1] + virtual_ref[0][1]) * h3;
s->sprite_delta[1][1] = (-r * 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 (s->sprite_delta[0][0] == a << ctx->sprite_shift[0] &&
s->sprite_delta[0][1] == 0 &&
s->sprite_delta[1][0] == 0 &&
s->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];
s->sprite_delta[0][0] = a;
s->sprite_delta[0][1] = 0;
s->sprite_delta[1][0] = 0;
s->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(s->sprite_delta[0][i]) >= INT_MAX >> shift_y ||
FFABS(s->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;
s->sprite_delta[0][i] *= 1 << shift_y;
s->sprite_delta[1][i] *= 1 << shift_y;
ctx->sprite_shift[i] = 16;
}
for (i = 0; i < 2; i++) {
int64_t sd[2] = {
s->sprite_delta[i][0] - a * (1LL<<16),
s->sprite_delta[i][1] - a * (1LL<<16)
};
if (llabs(sprite_offset[0][i] + s->sprite_delta[i][0] * (w+16LL)) >= INT_MAX ||
llabs(sprite_offset[0][i] + s->sprite_delta[i][1] * (h+16LL)) >= INT_MAX ||
llabs(sprite_offset[0][i] + s->sprite_delta[i][0] * (w+16LL) + s->sprite_delta[i][1] * (h+16LL)) >= INT_MAX ||
llabs(s->sprite_delta[i][0] * (w+16LL)) >= INT_MAX ||
llabs(s->sprite_delta[i][1] * (w+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;
}
s->sprite_offset[0][0] = sprite_offset[0][0];
s->sprite_offset[0][1] = sprite_offset[0][1];
s->sprite_offset[1][0] = sprite_offset[1][0];
s->sprite_offset[1][1] = sprite_offset[1][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 -1;
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 -1;
}
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) {
av_log(s->avctx, AV_LOG_ERROR,
"illegal mb_num in video packet (%d %d) \n", mb_num, s->mb_num);
return -1;
}
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;
}
/**
* 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)
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 * 16 + dy * s->mb_y * 16;
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 -1;
}
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 -1;
}
}
}
}
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_long(&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 -1;
}
} 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 -1;
}
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 -1;
}
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 -1;
my = ff_h263_decode_motion(s, pred_y, s->f_code);
if (my >= 0xffff)
return -1;
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 -1;
my = ff_h263_decode_motion(s, pred_y, s->f_code);
if (my >= 0xffff)
return -1;
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 -1;
}
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 -1;
}
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 -1;
}
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 -1;
}
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;
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 -1;
}
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 -1;
}
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_long(&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 -1;
}
} 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 -1;
}
}
ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
s->mb_x - 1, s->mb_y, part_a_end);
if (mpeg4_decode_partition_b(s, mb_num) < 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 -1;
} 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 -1;
}
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 -1;
}
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 -1;
}
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 -1;
}
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 -1;
}
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 -1;
}
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 -1;
}
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 -1;
}
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 -1;
}
}
}
}
#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 -1;
}
}
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 -1;
}
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 = (Mpeg4DecContext *)s;
int cbp, mb_type;
const int xy = s->mb_x + s->mb_y * s->mb_stride;
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 -1;
}
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 = (Mpeg4DecContext *)s;
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->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 -1;
}
} 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 -1;
my = ff_h263_decode_motion(s, pred_y / 2, s->f_code);
if (my >= 0xffff)
return -1;
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 -1;
my = ff_h263_decode_motion(s, pred_y, s->f_code);
if (my >= 0xffff)
return -1;
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 -1;
my = ff_h263_decode_motion(s, pred_y, s->f_code);
if (my >= 0xffff)
return -1;
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 -1;
}
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 -1;
}
} 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 -1;
}
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 -1;
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 -1;
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 -1;
} 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;
}
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 -1;
}
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)
{
s->avctx->profile = get_bits(gb, 4);
s->avctx->level = get_bits(gb, 4);
// for Simple profile, level 0
if (s->avctx->profile == 0 && s->avctx->level == 8) {
s->avctx->level = 0;
}
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 (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;
/* load default matrixes */
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;
}
/* 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)
build = (ver << 16) + (ver2 << 8) + ver3;
}
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)
{
MpegEncContext *s = &ctx->m;
int time_incr, time_increment;
int64_t pts;
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);
}
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
}
}
/* 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;
}
/**
* Decode MPEG-4 headers.
* @return <0 if no VOP found (or a damaged one)
* FRAME_SKIPPED if a not coded VOP is found
* 0 if a VOP is found
*/
int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb)
{
MpegEncContext *s = &ctx->m;
unsigned startcode, v;
int ret;
int vol = 0;
/* search next start code */
align_get_bits(gb);
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
return -1; // 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_ERROR, "Multiple VOL headers");
return AVERROR_INVALIDDATA;
}
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) {
mpeg4_decode_profile_level(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;
return decode_vop_header(ctx, gb);
}
av_cold void ff_mpeg4videodec_static_init(void) {
static int done = 0;
if (!done) {
ff_rl_init(&ff_mpeg4_rl_intra, ff_mpeg4_static_rl_table_store[0]);
ff_rl_init(&ff_rvlc_rl_inter, ff_mpeg4_static_rl_table_store[1]);
ff_rl_init(&ff_rvlc_rl_intra, ff_mpeg4_static_rl_table_store[2]);
INIT_VLC_RL(ff_mpeg4_rl_intra, 554);
INIT_VLC_RL(ff_rvlc_rl_inter, 1072);
INIT_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(&sprite_trajectory, SPRITE_TRAJ_VLC_BITS, 15,
&ff_sprite_trajectory_tab[0][1], 4, 2,
&ff_sprite_trajectory_tab[0][0], 4, 2, 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);
done = 1;
}
}
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;
memcpy(((uint8_t*)s) + sizeof(MpegEncContext), ((uint8_t*)s1) + sizeof(MpegEncContext), sizeof(Mpeg4DecContext) - sizeof(MpegEncContext));
if (CONFIG_MPEG4_DECODER && !init && s1->xvid_build >= 0)
ff_xvid_idct_init(&s->m.idsp, dst);
return 0;
}
#endif
static av_cold int decode_init(AVCodecContext *avctx)
{
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;
ff_mpeg4videodec_static_init();
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;
avctx->internal->allocate_progress = 1;
return 0;
}
static const AVOption mpeg4_options[] = {
{"quarter_sample", "1/4 subpel MC", offsetof(MpegEncContext, quarter_sample), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, 0},
{"divx_packed", "divx style packed b frames", offsetof(MpegEncContext, divx_packed), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, 0},
{NULL}
};
static const AVClass mpeg4_class = {
"MPEG4 Video Decoder",
av_default_item_name,
mpeg4_options,
LIBAVUTIL_VERSION_INT,
};
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 |
AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |
AV_CODEC_CAP_FRAME_THREADS,
.caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
.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),
.priv_class = &mpeg4_class,
};
#if CONFIG_MPEG4_VDPAU_DECODER && FF_API_VDPAU
static const AVClass mpeg4_vdpau_class = {
"MPEG4 Video VDPAU Decoder",
av_default_item_name,
mpeg4_options,
LIBAVUTIL_VERSION_INT,
};
AVCodec ff_mpeg4_vdpau_decoder = {
.name = "mpeg4_vdpau",
.long_name = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 (VDPAU)"),
.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_DR1 | AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |
AV_CODEC_CAP_HWACCEL_VDPAU,
.pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_VDPAU_MPEG4,
AV_PIX_FMT_NONE },
.priv_class = &mpeg4_vdpau_class,
};
#endif
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