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7b1f9873be
FFmpeg/libavcodec/mpeg12dec.c
wm4 f9e7a2f95a dxva: add support for new dxva2 and d3d11 hwaccel APIs 
This also adds support to avconv (which is trivial due to the new
hwaccel API being generic enough).

The new decoder setup code in dxva2.c is significantly based on work by
Steve Lhomme <robux4@gmail.com>, but with heavy changes/rewrites.

Signed-off-by: Diego Biurrun <diego@biurrun.de>
2017-06-08 21:20:18 +02:00

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/*
* MPEG-1/2 decoder
* Copyright (c) 2000, 2001 Fabrice Bellard
* Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
*
* This file is part of Libav.
*
* Libav 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.
*
* Libav 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 Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* MPEG-1/2 decoder
*/
#include <inttypes.h>
#include "libavutil/attributes.h"
#include "libavutil/internal.h"
#include "libavutil/stereo3d.h"
#include "avcodec.h"
#include "bytestream.h"
#include "error_resilience.h"
#include "idctdsp.h"
#include "internal.h"
#include "mpeg_er.h"
#include "mpeg12.h"
#include "mpeg12data.h"
#include "mpegutils.h"
#include "mpegvideo.h"
#include "mpegvideodata.h"
#include "profiles.h"
#include "thread.h"
#include "version.h"
typedef struct Mpeg1Context {
MpegEncContext mpeg_enc_ctx;
int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
int repeat_field; /* true if we must repeat the field */
AVPanScan pan_scan; /* some temporary storage for the panscan */
AVStereo3D stereo3d;
int has_stereo3d;
uint8_t *a53_caption;
int a53_caption_size;
uint8_t afd;
int has_afd;
int slice_count;
int save_aspect_info;
int save_width, save_height, save_progressive_seq;
AVRational frame_rate_ext; /* MPEG-2 specific framerate modificator */
int sync; /* Did we reach a sync point like a GOP/SEQ/KEYFrame? */
int closed_gop; /* GOP is closed */
int first_slice;
int extradata_decoded;
} Mpeg1Context;
#define MB_TYPE_ZERO_MV 0x20000000
static const uint32_t ptype2mb_type[7] = {
MB_TYPE_INTRA,
MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
MB_TYPE_L0,
MB_TYPE_L0 | MB_TYPE_CBP,
MB_TYPE_QUANT | MB_TYPE_INTRA,
MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP,
};
static const uint32_t btype2mb_type[11] = {
MB_TYPE_INTRA,
MB_TYPE_L1,
MB_TYPE_L1 | MB_TYPE_CBP,
MB_TYPE_L0,
MB_TYPE_L0 | MB_TYPE_CBP,
MB_TYPE_L0L1,
MB_TYPE_L0L1 | MB_TYPE_CBP,
MB_TYPE_QUANT | MB_TYPE_INTRA,
MB_TYPE_QUANT | MB_TYPE_L1 | MB_TYPE_CBP,
MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP,
MB_TYPE_QUANT | MB_TYPE_L0L1 | MB_TYPE_CBP,
};
static const uint8_t non_linear_qscale[32] = {
0, 1, 2, 3, 4, 5, 6, 7,
8, 10, 12, 14, 16, 18, 20, 22,
24, 28, 32, 36, 40, 44, 48, 52,
56, 64, 72, 80, 88, 96, 104, 112,
};
/* as H.263, but only 17 codes */
static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
{
int code, sign, val, shift;
code = get_vlc2(&s->gb, ff_mv_vlc.table, MV_VLC_BITS, 2);
if (code == 0)
return pred;
if (code < 0)
return 0xffff;
sign = get_bits1(&s->gb);
shift = fcode - 1;
val = code;
if (shift) {
val = (val - 1) << shift;
val |= get_bits(&s->gb, shift);
val++;
}
if (sign)
val = -val;
val += pred;
/* modulo decoding */
return sign_extend(val, 5 + shift);
}
#define MAX_INDEX (64 - 1)
#define check_scantable_index(ctx, x) \
do { \
if ((x) > MAX_INDEX) { \
av_log(ctx->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", \
ctx->mb_x, ctx->mb_y); \
return AVERROR_INVALIDDATA; \
} \
} while (0)
static inline int mpeg1_decode_block_inter(MpegEncContext *s,
int16_t *block, int n)
{
int level, i, j, run;
RLTable *rl = &ff_rl_mpeg1;
uint8_t *const scantable = s->intra_scantable.permutated;
const uint16_t *quant_matrix = s->inter_matrix;
const int qscale = s->qscale;
{
OPEN_READER(re, &s->gb);
i = -1;
// special case for first coefficient, no need to add second VLC table
UPDATE_CACHE(re, &s->gb);
if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
level = (3 * qscale * quant_matrix[0]) >> 5;
level = (level - 1) | 1;
if (GET_CACHE(re, &s->gb) & 0x40000000)
level = -level;
block[0] = level;
i++;
SKIP_BITS(re, &s->gb, 2);
if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
goto end;
}
/* now quantify & encode AC coefficients */
for (;;) {
GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
TEX_VLC_BITS, 2, 0);
if (level != 0) {
i += run;
if (i > MAX_INDEX)
break;
j = scantable[i];
level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
level = (level - 1) | 1;
level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
SHOW_SBITS(re, &s->gb, 1);
SKIP_BITS(re, &s->gb, 1);
} else {
/* escape */
run = SHOW_UBITS(re, &s->gb, 6) + 1;
LAST_SKIP_BITS(re, &s->gb, 6);
UPDATE_CACHE(re, &s->gb);
level = SHOW_SBITS(re, &s->gb, 8);
SKIP_BITS(re, &s->gb, 8);
if (level == -128) {
level = SHOW_UBITS(re, &s->gb, 8) - 256;
SKIP_BITS(re, &s->gb, 8);
} else if (level == 0) {
level = SHOW_UBITS(re, &s->gb, 8);
SKIP_BITS(re, &s->gb, 8);
}
i += run;
if (i > MAX_INDEX)
break;
j = scantable[i];
if (level < 0) {
level = -level;
level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
level = (level - 1) | 1;
level = -level;
} else {
level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
level = (level - 1) | 1;
}
}
block[j] = level;
if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
break;
UPDATE_CACHE(re, &s->gb);
}
end:
LAST_SKIP_BITS(re, &s->gb, 2);
CLOSE_READER(re, &s->gb);
}
check_scantable_index(s, i);
s->block_last_index[n] = i;
return 0;
}
static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s,
int16_t *block, int n)
{
int level, i, j, run;
RLTable *rl = &ff_rl_mpeg1;
uint8_t *const scantable = s->intra_scantable.permutated;
const int qscale = s->qscale;
{
OPEN_READER(re, &s->gb);
i = -1;
// Special case for first coefficient, no need to add second VLC table.
UPDATE_CACHE(re, &s->gb);
if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
level = (3 * qscale) >> 1;
level = (level - 1) | 1;
if (GET_CACHE(re, &s->gb) & 0x40000000)
level = -level;
block[0] = level;
i++;
SKIP_BITS(re, &s->gb, 2);
if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
goto end;
}
/* now quantify & encode AC coefficients */
for (;;) {
GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
TEX_VLC_BITS, 2, 0);
if (level != 0) {
i += run;
if (i > MAX_INDEX)
break;
j = scantable[i];
level = ((level * 2 + 1) * qscale) >> 1;
level = (level - 1) | 1;
level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
SHOW_SBITS(re, &s->gb, 1);
SKIP_BITS(re, &s->gb, 1);
} else {
/* escape */
run = SHOW_UBITS(re, &s->gb, 6) + 1;
LAST_SKIP_BITS(re, &s->gb, 6);
UPDATE_CACHE(re, &s->gb);
level = SHOW_SBITS(re, &s->gb, 8);
SKIP_BITS(re, &s->gb, 8);
if (level == -128) {
level = SHOW_UBITS(re, &s->gb, 8) - 256;
SKIP_BITS(re, &s->gb, 8);
} else if (level == 0) {
level = SHOW_UBITS(re, &s->gb, 8);
SKIP_BITS(re, &s->gb, 8);
}
i += run;
if (i > MAX_INDEX)
break;
j = scantable[i];
if (level < 0) {
level = -level;
level = ((level * 2 + 1) * qscale) >> 1;
level = (level - 1) | 1;
level = -level;
} else {
level = ((level * 2 + 1) * qscale) >> 1;
level = (level - 1) | 1;
}
}
block[j] = level;
if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
break;
UPDATE_CACHE(re, &s->gb);
}
end:
LAST_SKIP_BITS(re, &s->gb, 2);
CLOSE_READER(re, &s->gb);
}
check_scantable_index(s, i);
s->block_last_index[n] = i;
return 0;
}
static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
int16_t *block, int n)
{
int level, i, j, run;
RLTable *rl = &ff_rl_mpeg1;
uint8_t *const scantable = s->intra_scantable.permutated;
const uint16_t *quant_matrix;
const int qscale = s->qscale;
int mismatch;
mismatch = 1;
{
OPEN_READER(re, &s->gb);
i = -1;
if (n < 4)
quant_matrix = s->inter_matrix;
else
quant_matrix = s->chroma_inter_matrix;
// Special case for first coefficient, no need to add second VLC table.
UPDATE_CACHE(re, &s->gb);
if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
level = (3 * qscale * quant_matrix[0]) >> 5;
if (GET_CACHE(re, &s->gb) & 0x40000000)
level = -level;
block[0] = level;
mismatch ^= level;
i++;
SKIP_BITS(re, &s->gb, 2);
if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
goto end;
}
/* now quantify & encode AC coefficients */
for (;;) {
GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
TEX_VLC_BITS, 2, 0);
if (level != 0) {
i += run;
if (i > MAX_INDEX)
break;
j = scantable[i];
level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
SHOW_SBITS(re, &s->gb, 1);
SKIP_BITS(re, &s->gb, 1);
} else {
/* escape */
run = SHOW_UBITS(re, &s->gb, 6) + 1;
LAST_SKIP_BITS(re, &s->gb, 6);
UPDATE_CACHE(re, &s->gb);
level = SHOW_SBITS(re, &s->gb, 12);
SKIP_BITS(re, &s->gb, 12);
i += run;
if (i > MAX_INDEX)
break;
j = scantable[i];
if (level < 0) {
level = ((-level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
level = -level;
} else {
level = ((level * 2 + 1) * qscale * quant_matrix[j]) >> 5;
}
}
mismatch ^= level;
block[j] = level;
if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
break;
UPDATE_CACHE(re, &s->gb);
}
end:
LAST_SKIP_BITS(re, &s->gb, 2);
CLOSE_READER(re, &s->gb);
}
block[63] ^= (mismatch & 1);
check_scantable_index(s, i);
s->block_last_index[n] = i;
return 0;
}
static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
int16_t *block, int n)
{
int level, i, j, run;
RLTable *rl = &ff_rl_mpeg1;
uint8_t *const scantable = s->intra_scantable.permutated;
const int qscale = s->qscale;
OPEN_READER(re, &s->gb);
i = -1;
// special case for first coefficient, no need to add second VLC table
UPDATE_CACHE(re, &s->gb);
if (((int32_t) GET_CACHE(re, &s->gb)) < 0) {
level = (3 * qscale) >> 1;
if (GET_CACHE(re, &s->gb) & 0x40000000)
level = -level;
block[0] = level;
i++;
SKIP_BITS(re, &s->gb, 2);
if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
goto end;
}
/* now quantify & encode AC coefficients */
for (;;) {
GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
if (level != 0) {
i += run;
if (i > MAX_INDEX)
break;
j = scantable[i];
level = ((level * 2 + 1) * qscale) >> 1;
level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
SHOW_SBITS(re, &s->gb, 1);
SKIP_BITS(re, &s->gb, 1);
} else {
/* escape */
run = SHOW_UBITS(re, &s->gb, 6) + 1;
LAST_SKIP_BITS(re, &s->gb, 6);
UPDATE_CACHE(re, &s->gb);
level = SHOW_SBITS(re, &s->gb, 12);
SKIP_BITS(re, &s->gb, 12);
i += run;
if (i > MAX_INDEX)
break;
j = scantable[i];
if (level < 0) {
level = ((-level * 2 + 1) * qscale) >> 1;
level = -level;
} else {
level = ((level * 2 + 1) * qscale) >> 1;
}
}
block[j] = level;
if (((int32_t) GET_CACHE(re, &s->gb)) <= (int32_t) 0xBFFFFFFF)
break;
UPDATE_CACHE(re, &s->gb);
}
end:
LAST_SKIP_BITS(re, &s->gb, 2);
CLOSE_READER(re, &s->gb);
check_scantable_index(s, i);
s->block_last_index[n] = i;
return 0;
}
static inline int mpeg2_decode_block_intra(MpegEncContext *s,
int16_t *block, int n)
{
int level, dc, diff, i, j, run;
int component;
RLTable *rl;
uint8_t *const scantable = s->intra_scantable.permutated;
const uint16_t *quant_matrix;
const int qscale = s->qscale;
int mismatch;
/* DC coefficient */
if (n < 4) {
quant_matrix = s->intra_matrix;
component = 0;
} else {
quant_matrix = s->chroma_intra_matrix;
component = (n & 1) + 1;
}
diff = decode_dc(&s->gb, component);
if (diff >= 0xffff)
return AVERROR_INVALIDDATA;
dc = s->last_dc[component];
dc += diff;
s->last_dc[component] = dc;
block[0] = dc << (3 - s->intra_dc_precision);
ff_dlog(s->avctx, "dc=%d\n", block[0]);
mismatch = block[0] ^ 1;
i = 0;
if (s->intra_vlc_format)
rl = &ff_rl_mpeg2;
else
rl = &ff_rl_mpeg1;
{
OPEN_READER(re, &s->gb);
/* now quantify & encode AC coefficients */
for (;;) {
UPDATE_CACHE(re, &s->gb);
GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
TEX_VLC_BITS, 2, 0);
if (level == 127) {
break;
} else if (level != 0) {
i += run;
if (i > MAX_INDEX)
break;
j = scantable[i];
level = (level * qscale * quant_matrix[j]) >> 4;
level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
SHOW_SBITS(re, &s->gb, 1);
LAST_SKIP_BITS(re, &s->gb, 1);
} else {
/* escape */
run = SHOW_UBITS(re, &s->gb, 6) + 1;
LAST_SKIP_BITS(re, &s->gb, 6);
UPDATE_CACHE(re, &s->gb);
level = SHOW_SBITS(re, &s->gb, 12);
SKIP_BITS(re, &s->gb, 12);
i += run;
if (i > MAX_INDEX)
break;
j = scantable[i];
if (level < 0) {
level = (-level * qscale * quant_matrix[j]) >> 4;
level = -level;
} else {
level = (level * qscale * quant_matrix[j]) >> 4;
}
}
mismatch ^= level;
block[j] = level;
}
CLOSE_READER(re, &s->gb);
}
block[63] ^= mismatch & 1;
check_scantable_index(s, i);
s->block_last_index[n] = i;
return 0;
}
static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s,
int16_t *block, int n)
{
int level, dc, diff, i, j, run;
int component;
RLTable *rl;
uint8_t *const scantable = s->intra_scantable.permutated;
const uint16_t *quant_matrix;
const int qscale = s->qscale;
/* DC coefficient */
if (n < 4) {
quant_matrix = s->intra_matrix;
component = 0;
} else {
quant_matrix = s->chroma_intra_matrix;
component = (n & 1) + 1;
}
diff = decode_dc(&s->gb, component);
if (diff >= 0xffff)
return AVERROR_INVALIDDATA;
dc = s->last_dc[component];
dc += diff;
s->last_dc[component] = dc;
block[0] = dc << (3 - s->intra_dc_precision);
i = 0;
if (s->intra_vlc_format)
rl = &ff_rl_mpeg2;
else
rl = &ff_rl_mpeg1;
{
OPEN_READER(re, &s->gb);
/* now quantify & encode AC coefficients */
for (;;) {
UPDATE_CACHE(re, &s->gb);
GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0],
TEX_VLC_BITS, 2, 0);
if (level == 127) {
break;
} else if (level != 0) {
i += run;
if (i > MAX_INDEX)
break;
j = scantable[i];
level = (level * qscale * quant_matrix[j]) >> 4;
level = (level ^ SHOW_SBITS(re, &s->gb, 1)) -
SHOW_SBITS(re, &s->gb, 1);
LAST_SKIP_BITS(re, &s->gb, 1);
} else {
/* escape */
run = SHOW_UBITS(re, &s->gb, 6) + 1;
LAST_SKIP_BITS(re, &s->gb, 6);
UPDATE_CACHE(re, &s->gb);
level = SHOW_SBITS(re, &s->gb, 12);
SKIP_BITS(re, &s->gb, 12);
i += run;
if (i > MAX_INDEX)
break;
j = scantable[i];
if (level < 0) {
level = (-level * qscale * quant_matrix[j]) >> 4;
level = -level;
} else {
level = (level * qscale * quant_matrix[j]) >> 4;
}
}
block[j] = level;
}
CLOSE_READER(re, &s->gb);
}
check_scantable_index(s, i);
s->block_last_index[n] = i;
return 0;
}
/******************************************/
/* decoding */
static inline int get_dmv(MpegEncContext *s)
{
if (get_bits1(&s->gb))
return 1 - (get_bits1(&s->gb) << 1);
else
return 0;
}
static inline int get_qscale(MpegEncContext *s)
{
int qscale = get_bits(&s->gb, 5);
if (s->q_scale_type)
return non_linear_qscale[qscale];
else
return qscale << 1;
}
/* motion type (for MPEG-2) */
#define MT_FIELD 1
#define MT_FRAME 2
#define MT_16X8 2
#define MT_DMV 3
static int mpeg_decode_mb(MpegEncContext *s, int16_t block[12][64])
{
int i, j, k, cbp, val, mb_type, motion_type;
const int mb_block_count = 4 + (1 << s->chroma_format);
int ret;
ff_dlog(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
assert(s->mb_skipped == 0);
if (s->mb_skip_run-- != 0) {
if (s->pict_type == AV_PICTURE_TYPE_P) {
s->mb_skipped = 1;
s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16;
} else {
int mb_type;
if (s->mb_x)
mb_type = s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1];
else
// FIXME not sure if this is allowed in MPEG at all
mb_type = s->current_picture.mb_type[s->mb_width + (s->mb_y - 1) * s->mb_stride - 1];
if (IS_INTRA(mb_type))
return AVERROR_INVALIDDATA;
s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
mb_type | MB_TYPE_SKIP;
// assert(s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride - 1] & (MB_TYPE_16x16 | MB_TYPE_16x8));
if ((s->mv[0][0][0] | s->mv[0][0][1] | s->mv[1][0][0] | s->mv[1][0][1]) == 0)
s->mb_skipped = 1;
}
return 0;
}
switch (s->pict_type) {
default:
case AV_PICTURE_TYPE_I:
if (get_bits1(&s->gb) == 0) {
if (get_bits1(&s->gb) == 0) {
av_log(s->avctx, AV_LOG_ERROR,
"Invalid mb type in I-frame at %d %d\n",
s->mb_x, s->mb_y);
return AVERROR_INVALIDDATA;
}
mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA;
} else {
mb_type = MB_TYPE_INTRA;
}
break;
case AV_PICTURE_TYPE_P:
mb_type = get_vlc2(&s->gb, ff_mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
if (mb_type < 0) {
av_log(s->avctx, AV_LOG_ERROR,
"Invalid mb type in P-frame at %d %d\n", s->mb_x, s->mb_y);
return AVERROR_INVALIDDATA;
}
mb_type = ptype2mb_type[mb_type];
break;
case AV_PICTURE_TYPE_B:
mb_type = get_vlc2(&s->gb, ff_mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
if (mb_type < 0) {
av_log(s->avctx, AV_LOG_ERROR,
"Invalid mb type in B-frame at %d %d\n", s->mb_x, s->mb_y);
return AVERROR_INVALIDDATA;
}
mb_type = btype2mb_type[mb_type];
break;
}
ff_dlog(s->avctx, "mb_type=%x\n", mb_type);
// motion_type = 0; /* avoid warning */
if (IS_INTRA(mb_type)) {
s->bdsp.clear_blocks(s->block[0]);
if (!s->chroma_y_shift)
s->bdsp.clear_blocks(s->block[6]);
/* compute DCT type */
// FIXME: add an interlaced_dct coded var?
if (s->picture_structure == PICT_FRAME &&
!s->frame_pred_frame_dct)
s->interlaced_dct = get_bits1(&s->gb);
if (IS_QUANT(mb_type))
s->qscale = get_qscale(s);
if (s->concealment_motion_vectors) {
/* just parse them */
if (s->picture_structure != PICT_FRAME)
skip_bits1(&s->gb); /* field select */
s->mv[0][0][0] =
s->last_mv[0][0][0] =
s->last_mv[0][1][0] = mpeg_decode_motion(s, s->mpeg_f_code[0][0],
s->last_mv[0][0][0]);
s->mv[0][0][1] =
s->last_mv[0][0][1] =
s->last_mv[0][1][1] = mpeg_decode_motion(s, s->mpeg_f_code[0][1],
s->last_mv[0][0][1]);
skip_bits1(&s->gb); /* marker */
} else {
/* reset mv prediction */
memset(s->last_mv, 0, sizeof(s->last_mv));
}
s->mb_intra = 1;
if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
for (i = 0; i < 6; i++)
mpeg2_fast_decode_block_intra(s, *s->pblocks[i], i);
} else {
for (i = 0; i < mb_block_count; i++)
if ((ret = mpeg2_decode_block_intra(s, *s->pblocks[i], i)) < 0)
return ret;
}
} else {
for (i = 0; i < 6; i++) {
ret = ff_mpeg1_decode_block_intra(&s->gb,
s->intra_matrix,
s->intra_scantable.permutated,
s->last_dc, *s->pblocks[i],
i, s->qscale);
if (ret < 0) {
av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n",
s->mb_x, s->mb_y);
return ret;
}
s->block_last_index[i] = ret;
}
}
} else {
if (mb_type & MB_TYPE_ZERO_MV) {
assert(mb_type & MB_TYPE_CBP);
s->mv_dir = MV_DIR_FORWARD;
if (s->picture_structure == PICT_FRAME) {
if (!s->frame_pred_frame_dct)
s->interlaced_dct = get_bits1(&s->gb);
s->mv_type = MV_TYPE_16X16;
} else {
s->mv_type = MV_TYPE_FIELD;
mb_type |= MB_TYPE_INTERLACED;
s->field_select[0][0] = s->picture_structure - 1;
}
if (IS_QUANT(mb_type))
s->qscale = get_qscale(s);
s->last_mv[0][0][0] = 0;
s->last_mv[0][0][1] = 0;
s->last_mv[0][1][0] = 0;
s->last_mv[0][1][1] = 0;
s->mv[0][0][0] = 0;
s->mv[0][0][1] = 0;
} else {
assert(mb_type & MB_TYPE_L0L1);
// FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
/* get additional motion vector type */
if (s->frame_pred_frame_dct) {
motion_type = MT_FRAME;
} else {
motion_type = get_bits(&s->gb, 2);
if (s->picture_structure == PICT_FRAME && HAS_CBP(mb_type))
s->interlaced_dct = get_bits1(&s->gb);
}
if (IS_QUANT(mb_type))
s->qscale = get_qscale(s);
/* motion vectors */
s->mv_dir = (mb_type >> 13) & 3;
ff_dlog(s->avctx, "motion_type=%d\n", motion_type);
switch (motion_type) {
case MT_FRAME: /* or MT_16X8 */
if (s->picture_structure == PICT_FRAME) {
mb_type |= MB_TYPE_16x16;
s->mv_type = MV_TYPE_16X16;
for (i = 0; i < 2; i++) {
if (USES_LIST(mb_type, i)) {
/* MT_FRAME */
s->mv[i][0][0] =
s->last_mv[i][0][0] =
s->last_mv[i][1][0] =
mpeg_decode_motion(s, s->mpeg_f_code[i][0],
s->last_mv[i][0][0]);
s->mv[i][0][1] =
s->last_mv[i][0][1] =
s->last_mv[i][1][1] =
mpeg_decode_motion(s, s->mpeg_f_code[i][1],
s->last_mv[i][0][1]);
/* full_pel: only for MPEG-1 */
if (s->full_pel[i]) {
s->mv[i][0][0] <<= 1;
s->mv[i][0][1] <<= 1;
}
}
}
} else {
mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
s->mv_type = MV_TYPE_16X8;
for (i = 0; i < 2; i++) {
if (USES_LIST(mb_type, i)) {
/* MT_16X8 */
for (j = 0; j < 2; j++) {
s->field_select[i][j] = get_bits1(&s->gb);
for (k = 0; k < 2; k++) {
val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
s->last_mv[i][j][k]);
s->last_mv[i][j][k] = val;
s->mv[i][j][k] = val;
}
}
}
}
}
break;
case MT_FIELD:
s->mv_type = MV_TYPE_FIELD;
if (s->picture_structure == PICT_FRAME) {
mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
for (i = 0; i < 2; i++) {
if (USES_LIST(mb_type, i)) {
for (j = 0; j < 2; j++) {
s->field_select[i][j] = get_bits1(&s->gb);
val = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
s->last_mv[i][j][0]);
s->last_mv[i][j][0] = val;
s->mv[i][j][0] = val;
ff_dlog(s->avctx, "fmx=%d\n", val);
val = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
s->last_mv[i][j][1] >> 1);
s->last_mv[i][j][1] = val << 1;
s->mv[i][j][1] = val;
ff_dlog(s->avctx, "fmy=%d\n", val);
}
}
}
} else {
mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
for (i = 0; i < 2; i++) {
if (USES_LIST(mb_type, i)) {
s->field_select[i][0] = get_bits1(&s->gb);
for (k = 0; k < 2; k++) {
val = mpeg_decode_motion(s, s->mpeg_f_code[i][k],
s->last_mv[i][0][k]);
s->last_mv[i][0][k] = val;
s->last_mv[i][1][k] = val;
s->mv[i][0][k] = val;
}
}
}
}
break;
case MT_DMV:
s->mv_type = MV_TYPE_DMV;
for (i = 0; i < 2; i++) {
if (USES_LIST(mb_type, i)) {
int dmx, dmy, mx, my, m;
const int my_shift = s->picture_structure == PICT_FRAME;
mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
s->last_mv[i][0][0]);
s->last_mv[i][0][0] = mx;
s->last_mv[i][1][0] = mx;
dmx = get_dmv(s);
my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
s->last_mv[i][0][1] >> my_shift);
dmy = get_dmv(s);
s->last_mv[i][0][1] = my << my_shift;
s->last_mv[i][1][1] = my << my_shift;
s->mv[i][0][0] = mx;
s->mv[i][0][1] = my;
s->mv[i][1][0] = mx; // not used
s->mv[i][1][1] = my; // not used
if (s->picture_structure == PICT_FRAME) {
mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED;
// m = 1 + 2 * s->top_field_first;
m = s->top_field_first ? 1 : 3;
/* top -> top pred */
s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1;
m = 4 - m;
s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx;
s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1;
} else {
mb_type |= MB_TYPE_16x16;
s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx;
s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy;
if (s->picture_structure == PICT_TOP_FIELD)
s->mv[i][2][1]--;
else
s->mv[i][2][1]++;
}
}
}
break;
default:
av_log(s->avctx, AV_LOG_ERROR,
"00 motion_type at %d %d\n", s->mb_x, s->mb_y);
return AVERROR_INVALIDDATA;
}
}
s->mb_intra = 0;
if (HAS_CBP(mb_type)) {
s->bdsp.clear_blocks(s->block[0]);
cbp = get_vlc2(&s->gb, ff_mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
if (mb_block_count > 6) {
cbp <<= mb_block_count - 6;
cbp |= get_bits(&s->gb, mb_block_count - 6);
s->bdsp.clear_blocks(s->block[6]);
}
if (cbp <= 0) {
av_log(s->avctx, AV_LOG_ERROR,
"invalid cbp at %d %d\n", s->mb_x, s->mb_y);
return AVERROR_INVALIDDATA;
}
if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
for (i = 0; i < 6; i++) {
if (cbp & 32)
mpeg2_fast_decode_block_non_intra(s, *s->pblocks[i], i);
else
s->block_last_index[i] = -1;
cbp += cbp;
}
} else {
cbp <<= 12 - mb_block_count;
for (i = 0; i < mb_block_count; i++) {
if (cbp & (1 << 11)) {
if ((ret = mpeg2_decode_block_non_intra(s, *s->pblocks[i], i)) < 0)
return ret;
} else {
s->block_last_index[i] = -1;
}
cbp += cbp;
}
}
} else {
if (s->avctx->flags2 & AV_CODEC_FLAG2_FAST) {
for (i = 0; i < 6; i++) {
if (cbp & 32)
mpeg1_fast_decode_block_inter(s, *s->pblocks[i], i);
else
s->block_last_index[i] = -1;
cbp += cbp;
}
} else {
for (i = 0; i < 6; i++) {
if (cbp & 32) {
if ((ret = mpeg1_decode_block_inter(s, *s->pblocks[i], i)) < 0)
return ret;
} else {
s->block_last_index[i] = -1;
}
cbp += cbp;
}
}
}
} else {
for (i = 0; i < 12; i++)
s->block_last_index[i] = -1;
}
}
s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] = mb_type;
return 0;
}
static av_cold int mpeg_decode_init(AVCodecContext *avctx)
{
Mpeg1Context *s = avctx->priv_data;
MpegEncContext *s2 = &s->mpeg_enc_ctx;
ff_mpv_decode_defaults(s2);
s->mpeg_enc_ctx.avctx = avctx;
/* we need some permutation to store matrices,
* until the decoder sets the real permutation. */
ff_mpv_idct_init(s2);
ff_mpeg12_common_init(&s->mpeg_enc_ctx);
ff_mpeg12_init_vlcs();
s->mpeg_enc_ctx_allocated = 0;
s->mpeg_enc_ctx.picture_number = 0;
s->repeat_field = 0;
s->mpeg_enc_ctx.codec_id = avctx->codec->id;
avctx->color_range = AVCOL_RANGE_MPEG;
if (avctx->codec->id == AV_CODEC_ID_MPEG1VIDEO)
avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
else
avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
return 0;
}
static int mpeg_decode_update_thread_context(AVCodecContext *avctx,
const AVCodecContext *avctx_from)
{
Mpeg1Context *ctx = avctx->priv_data, *ctx_from = avctx_from->priv_data;
MpegEncContext *s = &ctx->mpeg_enc_ctx, *s1 = &ctx_from->mpeg_enc_ctx;
int err;
if (avctx == avctx_from ||
!ctx_from->mpeg_enc_ctx_allocated ||
!s1->context_initialized)
return 0;
err = ff_mpeg_update_thread_context(avctx, avctx_from);
if (err)
return err;
if (!ctx->mpeg_enc_ctx_allocated) {
// copy the whole context after the initial MpegEncContext structure
memcpy(ctx, ctx_from, sizeof(*ctx));
memset(&ctx->mpeg_enc_ctx, 0, sizeof(ctx->mpeg_enc_ctx));
}
if (!(s->pict_type == AV_PICTURE_TYPE_B || s->low_delay))
s->picture_number++;
return 0;
}
static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
const uint8_t *new_perm)
{
uint16_t temp_matrix[64];
int i;
memcpy(temp_matrix, matrix, 64 * sizeof(uint16_t));
for (i = 0; i < 64; i++)
matrix[new_perm[i]] = temp_matrix[old_perm[i]];
}
static const enum AVPixelFormat mpeg12_hwaccel_pixfmt_list_420[] = {
#if CONFIG_MPEG2_DXVA2_HWACCEL
AV_PIX_FMT_DXVA2_VLD,
#endif
#if CONFIG_MPEG2_D3D11VA_HWACCEL
AV_PIX_FMT_D3D11VA_VLD,
AV_PIX_FMT_D3D11,
#endif
#if CONFIG_MPEG2_VAAPI_HWACCEL
AV_PIX_FMT_VAAPI,
#endif
#if CONFIG_MPEG1_VDPAU_HWACCEL | CONFIG_MPEG2_VDPAU_HWACCEL
AV_PIX_FMT_VDPAU,
#endif
AV_PIX_FMT_YUV420P,
AV_PIX_FMT_NONE
};
static const enum AVPixelFormat mpeg12_pixfmt_list_422[] = {
AV_PIX_FMT_YUV422P,
AV_PIX_FMT_NONE
};
static const enum AVPixelFormat mpeg12_pixfmt_list_444[] = {
AV_PIX_FMT_YUV444P,
AV_PIX_FMT_NONE
};
static enum AVPixelFormat mpeg_get_pixelformat(AVCodecContext *avctx)
{
Mpeg1Context *s1 = avctx->priv_data;
MpegEncContext *s = &s1->mpeg_enc_ctx;
const enum AVPixelFormat *pix_fmts;
if (s->chroma_format < 2)
pix_fmts = mpeg12_hwaccel_pixfmt_list_420;
else if (s->chroma_format == 2)
pix_fmts = mpeg12_pixfmt_list_422;
else
pix_fmts = mpeg12_pixfmt_list_444;
return ff_get_format(avctx, pix_fmts);
}
/* Call this function when we know all parameters.
* It may be called in different places for MPEG-1 and MPEG-2. */
static int mpeg_decode_postinit(AVCodecContext *avctx)
{
Mpeg1Context *s1 = avctx->priv_data;
MpegEncContext *s = &s1->mpeg_enc_ctx;
uint8_t old_permutation[64];
int ret;
if ((s1->mpeg_enc_ctx_allocated == 0) ||
avctx->coded_width != s->width ||
avctx->coded_height != s->height ||
s1->save_width != s->width ||
s1->save_height != s->height ||
s1->save_aspect_info != s->aspect_ratio_info ||
s1->save_progressive_seq != s->progressive_sequence ||
0) {
if (s1->mpeg_enc_ctx_allocated) {
ParseContext pc = s->parse_context;
s->parse_context.buffer = 0;
ff_mpv_common_end(s);
s->parse_context = pc;
}
ret = ff_set_dimensions(avctx, s->width, s->height);
if (ret < 0)
return ret;
avctx->bit_rate = s->bit_rate;
s1->save_aspect_info = s->aspect_ratio_info;
s1->save_width = s->width;
s1->save_height = s->height;
s1->save_progressive_seq = s->progressive_sequence;
/* low_delay may be forced, in this case we will have B-frames
* that behave like P-frames. */
avctx->has_b_frames = !s->low_delay;
if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
// MPEG-1 fps
avctx->framerate = ff_mpeg12_frame_rate_tab[s->frame_rate_index];
// MPEG-1 aspect
avctx->sample_aspect_ratio = av_d2q(1.0 / ff_mpeg1_aspect[s->aspect_ratio_info], 255);
avctx->ticks_per_frame = 1;
} else { // MPEG-2
// MPEG-2 fps
av_reduce(&s->avctx->framerate.num,
&s->avctx->framerate.den,
ff_mpeg12_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num * 2,
ff_mpeg12_frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den,
1 << 30);
avctx->ticks_per_frame = 2;
// MPEG-2 aspect
if (s->aspect_ratio_info > 1) {
AVRational dar =
av_mul_q(av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
(AVRational) { s1->pan_scan.width,
s1->pan_scan.height }),
(AVRational) { s->width, s->height });
/* We ignore the spec here and guess a bit as reality does not
* match the spec, see for example res_change_ffmpeg_aspect.ts
* and sequence-display-aspect.mpg.
* issue1613, 621, 562 */
if ((s1->pan_scan.width == 0) || (s1->pan_scan.height == 0) ||
(av_cmp_q(dar, (AVRational) { 4, 3 }) &&
av_cmp_q(dar, (AVRational) { 16, 9 }))) {
s->avctx->sample_aspect_ratio =
av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
(AVRational) { s->width, s->height });
} else {
s->avctx->sample_aspect_ratio =
av_div_q(ff_mpeg2_aspect[s->aspect_ratio_info],
(AVRational) { s1->pan_scan.width, s1->pan_scan.height });
// issue1613 4/3 16/9 -> 16/9
// res_change_ffmpeg_aspect.ts 4/3 225/44 ->4/3
// widescreen-issue562.mpg 4/3 16/9 -> 16/9
// s->avctx->sample_aspect_ratio = av_mul_q(s->avctx->sample_aspect_ratio, (AVRational) {s->width, s->height});
ff_dlog(avctx, "A %d/%d\n",
ff_mpeg2_aspect[s->aspect_ratio_info].num,
ff_mpeg2_aspect[s->aspect_ratio_info].den);
ff_dlog(avctx, "B %d/%d\n", s->avctx->sample_aspect_ratio.num,
s->avctx->sample_aspect_ratio.den);
}
} else {
s->avctx->sample_aspect_ratio =
ff_mpeg2_aspect[s->aspect_ratio_info];
}
} // MPEG-2
ff_set_sar(s->avctx, s->avctx->sample_aspect_ratio);
avctx->pix_fmt = mpeg_get_pixelformat(avctx);
// until then pix_fmt may be changed right after codec init
if (avctx->hwaccel && avctx->idct_algo == FF_IDCT_AUTO)
avctx->idct_algo = FF_IDCT_SIMPLE;
/* Quantization matrices may need reordering
* if DCT permutation is changed. */
memcpy(old_permutation, s->idsp.idct_permutation, 64 * sizeof(uint8_t));
ff_mpv_idct_init(s);
if ((ret = ff_mpv_common_init(s)) < 0)
return ret;
quant_matrix_rebuild(s->intra_matrix, old_permutation, s->idsp.idct_permutation);
quant_matrix_rebuild(s->inter_matrix, old_permutation, s->idsp.idct_permutation);
quant_matrix_rebuild(s->chroma_intra_matrix, old_permutation, s->idsp.idct_permutation);
quant_matrix_rebuild(s->chroma_inter_matrix, old_permutation, s->idsp.idct_permutation);
s1->mpeg_enc_ctx_allocated = 1;
}
return 0;
}
static int mpeg1_decode_picture(AVCodecContext *avctx, const uint8_t *buf,
int buf_size)
{
Mpeg1Context *s1 = avctx->priv_data;
MpegEncContext *s = &s1->mpeg_enc_ctx;
int ref, f_code, vbv_delay;
init_get_bits(&s->gb, buf, buf_size * 8);
ref = get_bits(&s->gb, 10); /* temporal ref */
s->pict_type = get_bits(&s->gb, 3);
if (s->pict_type == 0 || s->pict_type > 3)
return AVERROR_INVALIDDATA;
vbv_delay = get_bits(&s->gb, 16);
if (s->pict_type == AV_PICTURE_TYPE_P ||
s->pict_type == AV_PICTURE_TYPE_B) {
s->full_pel[0] = get_bits1(&s->gb);
f_code = get_bits(&s->gb, 3);
if (f_code == 0 && (avctx->err_recognition & AV_EF_BITSTREAM))
return AVERROR_INVALIDDATA;
s->mpeg_f_code[0][0] = f_code;
s->mpeg_f_code[0][1] = f_code;
}
if (s->pict_type == AV_PICTURE_TYPE_B) {
s->full_pel[1] = get_bits1(&s->gb);
f_code = get_bits(&s->gb, 3);
if (f_code == 0 && (avctx->err_recognition & AV_EF_BITSTREAM))
return AVERROR_INVALIDDATA;
s->mpeg_f_code[1][0] = f_code;
s->mpeg_f_code[1][1] = f_code;
}
s->current_picture.f->pict_type = s->pict_type;
s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
if (avctx->debug & FF_DEBUG_PICT_INFO)
av_log(avctx, AV_LOG_DEBUG,
"vbv_delay %d, ref %d type:%d\n", vbv_delay, ref, s->pict_type);
s->y_dc_scale = 8;
s->c_dc_scale = 8;
return 0;
}
static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
{
MpegEncContext *s = &s1->mpeg_enc_ctx;
int horiz_size_ext, vert_size_ext;
int bit_rate_ext;
skip_bits(&s->gb, 1); /* profile and level esc*/
s->avctx->profile = get_bits(&s->gb, 3);
s->avctx->level = get_bits(&s->gb, 4);
s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */
s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
horiz_size_ext = get_bits(&s->gb, 2);
vert_size_ext = get_bits(&s->gb, 2);
s->width |= (horiz_size_ext << 12);
s->height |= (vert_size_ext << 12);
bit_rate_ext = get_bits(&s->gb, 12) << 18;
if (bit_rate_ext < INT_MAX / 400 &&
bit_rate_ext * 400 < INT_MAX - s->bit_rate) {
s->bit_rate += bit_rate_ext * 400;
} else {
av_log(s->avctx, AV_LOG_WARNING, "Invalid bit rate extension value: %d\n",
bit_rate_ext >> 18);
s->bit_rate = 0;
}
skip_bits1(&s->gb); /* marker */
s->avctx->rc_buffer_size += get_bits(&s->gb, 8) * 1024 * 16 << 10;
s->low_delay = get_bits1(&s->gb);
if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
s->low_delay = 1;
s1->frame_rate_ext.num = get_bits(&s->gb, 2) + 1;
s1->frame_rate_ext.den = get_bits(&s->gb, 5) + 1;
ff_dlog(s->avctx, "sequence extension\n");
s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
if (s->avctx->debug & FF_DEBUG_PICT_INFO)
av_log(s->avctx, AV_LOG_DEBUG,
"profile: %d, level: %d vbv buffer: %d, bitrate:%d\n",
s->avctx->profile, s->avctx->level,
s->avctx->rc_buffer_size, s->bit_rate);
}
static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
{
MpegEncContext *s = &s1->mpeg_enc_ctx;
int color_description, w, h;
skip_bits(&s->gb, 3); /* video format */
color_description = get_bits1(&s->gb);
if (color_description) {
s->avctx->color_primaries = get_bits(&s->gb, 8);
s->avctx->color_trc = get_bits(&s->gb, 8);
s->avctx->colorspace = get_bits(&s->gb, 8);
}
w = get_bits(&s->gb, 14);
skip_bits(&s->gb, 1); // marker
h = get_bits(&s->gb, 14);
// remaining 3 bits are zero padding
s1->pan_scan.width = 16 * w;
s1->pan_scan.height = 16 * h;
if (s->avctx->debug & FF_DEBUG_PICT_INFO)
av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
}
static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
{
MpegEncContext *s = &s1->mpeg_enc_ctx;
int i, nofco;
nofco = 1;
if (s->progressive_sequence) {
if (s->repeat_first_field) {
nofco++;
if (s->top_field_first)
nofco++;
}
} else {
if (s->picture_structure == PICT_FRAME) {
nofco++;
if (s->repeat_first_field)
nofco++;
}
}
for (i = 0; i < nofco; i++) {
s1->pan_scan.position[i][0] = get_sbits(&s->gb, 16);
skip_bits(&s->gb, 1); // marker
s1->pan_scan.position[i][1] = get_sbits(&s->gb, 16);
skip_bits(&s->gb, 1); // marker
}
if (s->avctx->debug & FF_DEBUG_PICT_INFO)
av_log(s->avctx, AV_LOG_DEBUG,
"pde (%"PRId16",%"PRId16") (%"PRId16",%"PRId16") (%"PRId16",%"PRId16")\n",
s1->pan_scan.position[0][0], s1->pan_scan.position[0][1],
s1->pan_scan.position[1][0], s1->pan_scan.position[1][1],
s1->pan_scan.position[2][0], s1->pan_scan.position[2][1]);
}
static int load_matrix(MpegEncContext *s, uint16_t matrix0[64],
uint16_t matrix1[64], int intra)
{
int i;
for (i = 0; i < 64; i++) {
int j = s->idsp.idct_permutation[ff_zigzag_direct[i]];
int v = get_bits(&s->gb, 8);
if (v == 0) {
av_log(s->avctx, AV_LOG_ERROR, "matrix damaged\n");
return AVERROR_INVALIDDATA;
}
if (intra && i == 0 && v != 8) {
av_log(s->avctx, AV_LOG_ERROR, "intra matrix invalid, ignoring\n");
v = 8; // needed by pink.mpg / issue1046
}
matrix0[j] = v;
if (matrix1)
matrix1[j] = v;
}
return 0;
}
static void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
{
ff_dlog(s->avctx, "matrix extension\n");
if (get_bits1(&s->gb))
load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
if (get_bits1(&s->gb))
load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
if (get_bits1(&s->gb))
load_matrix(s, s->chroma_intra_matrix, NULL, 1);
if (get_bits1(&s->gb))
load_matrix(s, s->chroma_inter_matrix, NULL, 0);
}
static void mpeg_decode_picture_coding_extension(Mpeg1Context *s1)
{
MpegEncContext *s = &s1->mpeg_enc_ctx;
s->full_pel[0] = s->full_pel[1] = 0;
s->mpeg_f_code[0][0] = get_bits(&s->gb, 4);
s->mpeg_f_code[0][1] = get_bits(&s->gb, 4);
s->mpeg_f_code[1][0] = get_bits(&s->gb, 4);
s->mpeg_f_code[1][1] = get_bits(&s->gb, 4);
if (!s->pict_type && s1->mpeg_enc_ctx_allocated) {
av_log(s->avctx, AV_LOG_ERROR,
"Missing picture start code, guessing missing values\n");
if (s->mpeg_f_code[1][0] == 15 && s->mpeg_f_code[1][1] == 15) {
if (s->mpeg_f_code[0][0] == 15 && s->mpeg_f_code[0][1] == 15)
s->pict_type = AV_PICTURE_TYPE_I;
else
s->pict_type = AV_PICTURE_TYPE_P;
} else
s->pict_type = AV_PICTURE_TYPE_B;
s->current_picture.f->pict_type = s->pict_type;
s->current_picture.f->key_frame = s->pict_type == AV_PICTURE_TYPE_I;
}
s->intra_dc_precision = get_bits(&s->gb, 2);
s->picture_structure = get_bits(&s->gb, 2);
s->top_field_first = get_bits1(&s->gb);
s->frame_pred_frame_dct = get_bits1(&s->gb);
s->concealment_motion_vectors = get_bits1(&s->gb);
s->q_scale_type = get_bits1(&s->gb);
s->intra_vlc_format = get_bits1(&s->gb);
s->alternate_scan = get_bits1(&s->gb);
s->repeat_first_field = get_bits1(&s->gb);
s->chroma_420_type = get_bits1(&s->gb);
s->progressive_frame = get_bits1(&s->gb);
if (s->progressive_sequence && !s->progressive_frame) {
s->progressive_frame = 1;
av_log(s->avctx, AV_LOG_ERROR,
"interlaced frame in progressive sequence, ignoring\n");
}
if (s->picture_structure == 0 ||
(s->progressive_frame && s->picture_structure != PICT_FRAME)) {
av_log(s->avctx, AV_LOG_ERROR,
"picture_structure %d invalid, ignoring\n",
s->picture_structure);
s->picture_structure = PICT_FRAME;
}
if (s->progressive_sequence && !s->frame_pred_frame_dct)
av_log(s->avctx, AV_LOG_WARNING, "invalid frame_pred_frame_dct\n");
if (s->picture_structure == PICT_FRAME) {
s->v_edge_pos = 16 * s->mb_height;
} else {
s->v_edge_pos = 8 * s->mb_height;
memset(s->mbskip_table, 0, s->mb_stride * s->mb_height);
}
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);
} 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);
}
/* composite display not parsed */
ff_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
ff_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
ff_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
ff_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
ff_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
ff_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
ff_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
ff_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
ff_dlog(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
}
static int mpeg_field_start(MpegEncContext *s, const uint8_t *buf, int buf_size)
{
AVCodecContext *avctx = s->avctx;
Mpeg1Context *s1 = (Mpeg1Context *) s;
int ret;
if (s->picture_structure == PICT_FRAME)
s->first_field = 0;
else
s->first_field ^= 1;
/* start frame decoding */
if (s->first_field || s->picture_structure == PICT_FRAME) {
AVFrameSideData *pan_scan;
if ((ret = ff_mpv_frame_start(s, avctx)) < 0)
return ret;
ff_mpeg_er_frame_start(s);
/* first check if we must repeat the frame */
s->current_picture_ptr->f->repeat_pict = 0;
if (s->repeat_first_field) {
if (s->progressive_sequence) {
if (s->top_field_first)
s->current_picture_ptr->f->repeat_pict = 4;
else
s->current_picture_ptr->f->repeat_pict = 2;
} else if (s->progressive_frame) {
s->current_picture_ptr->f->repeat_pict = 1;
}
}
pan_scan = av_frame_new_side_data(s->current_picture_ptr->f,
AV_FRAME_DATA_PANSCAN,
sizeof(s1->pan_scan));
if (!pan_scan)
return AVERROR(ENOMEM);
memcpy(pan_scan->data, &s1->pan_scan, sizeof(s1->pan_scan));
if (s1->a53_caption) {
AVFrameSideData *sd = av_frame_new_side_data(
s->current_picture_ptr->f, AV_FRAME_DATA_A53_CC,
s1->a53_caption_size);
if (sd)
memcpy(sd->data, s1->a53_caption, s1->a53_caption_size);
av_freep(&s1->a53_caption);
}
if (s1->has_stereo3d) {
AVStereo3D *stereo = av_stereo3d_create_side_data(s->current_picture_ptr->f);
if (!stereo)
return AVERROR(ENOMEM);
*stereo = s1->stereo3d;
s1->has_stereo3d = 0;
}
if (s1->has_afd) {
AVFrameSideData *sd =
av_frame_new_side_data(s->current_picture_ptr->f,
AV_FRAME_DATA_AFD, 1);
if (!sd)
return AVERROR(ENOMEM);
*sd->data = s1->afd;
s1->has_afd = 0;
}
if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_FRAME))
ff_thread_finish_setup(avctx);
} else { // second field
int i;
if (!s->current_picture_ptr) {
av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
return AVERROR_INVALIDDATA;
}
if (s->avctx->hwaccel &&
(s->avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
av_log(avctx, AV_LOG_ERROR,
"hardware accelerator failed to decode first field\n");
}
for (i = 0; i < 4; i++) {
s->current_picture.f->data[i] = s->current_picture_ptr->f->data[i];
if (s->picture_structure == PICT_BOTTOM_FIELD)
s->current_picture.f->data[i] +=
s->current_picture_ptr->f->linesize[i];
}
}
if (avctx->hwaccel) {
if ((ret = avctx->hwaccel->start_frame(avctx, buf, buf_size)) < 0)
return ret;
}
return 0;
}
#define DECODE_SLICE_ERROR -1
#define DECODE_SLICE_OK 0
/**
* Decode a slice.
* MpegEncContext.mb_y must be set to the MB row from the startcode.
* @return DECODE_SLICE_ERROR if the slice is damaged,
* DECODE_SLICE_OK if this slice is OK
*/
static int mpeg_decode_slice(MpegEncContext *s, int mb_y,
const uint8_t **buf, int buf_size)
{
AVCodecContext *avctx = s->avctx;
const int field_pic = s->picture_structure != PICT_FRAME;
int ret;
s->resync_mb_x =
s->resync_mb_y = -1;
assert(mb_y < s->mb_height);
init_get_bits(&s->gb, *buf, buf_size * 8);
ff_mpeg1_clean_buffers(s);
s->interlaced_dct = 0;
s->qscale = get_qscale(s);
if (s->qscale == 0) {
av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
return AVERROR_INVALIDDATA;
}
/* extra slice info */
while (get_bits1(&s->gb) != 0)
skip_bits(&s->gb, 8);
s->mb_x = 0;
if (mb_y == 0 && s->codec_tag == AV_RL32("SLIF")) {
skip_bits1(&s->gb);
} else {
while (get_bits_left(&s->gb) > 0) {
int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
MBINCR_VLC_BITS, 2);
if (code < 0) {
av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damaged\n");
return AVERROR_INVALIDDATA;
}
if (code >= 33) {
if (code == 33)
s->mb_x += 33;
/* otherwise, stuffing, nothing to do */
} else {
s->mb_x += code;
break;
}
}
}
if (s->mb_x >= (unsigned) s->mb_width) {
av_log(s->avctx, AV_LOG_ERROR, "initial skip overflow\n");
return AVERROR_INVALIDDATA;
}
if (avctx->hwaccel) {
const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
int start_code = -1;
buf_end = avpriv_find_start_code(buf_start + 2, *buf + buf_size, &start_code);
if (buf_end < *buf + buf_size)
buf_end -= 4;
s->mb_y = mb_y;
if (avctx->hwaccel->decode_slice(avctx, buf_start, buf_end - buf_start) < 0)
return DECODE_SLICE_ERROR;
*buf = buf_end;
return DECODE_SLICE_OK;
}
s->resync_mb_x = s->mb_x;
s->resync_mb_y = s->mb_y = mb_y;
s->mb_skip_run = 0;
ff_init_block_index(s);
if (s->mb_y == 0 && s->mb_x == 0 && (s->first_field || s->picture_structure == PICT_FRAME)) {
if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
av_log(s->avctx, AV_LOG_DEBUG,
"qp:%d fc:%2d%2d%2d%2d %s %s %s %s %s dc:%d pstruct:%d fdct:%d cmv:%d qtype:%d ivlc:%d rff:%d %s\n",
s->qscale,
s->mpeg_f_code[0][0], s->mpeg_f_code[0][1],
s->mpeg_f_code[1][0], s->mpeg_f_code[1][1],
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")),
s->progressive_sequence ? "ps" : "",
s->progressive_frame ? "pf" : "",
s->alternate_scan ? "alt" : "",
s->top_field_first ? "top" : "",
s->intra_dc_precision, s->picture_structure,
s->frame_pred_frame_dct, s->concealment_motion_vectors,
s->q_scale_type, s->intra_vlc_format,
s->repeat_first_field, s->chroma_420_type ? "420" : "");
}
}
for (;;) {
if ((ret = mpeg_decode_mb(s, s->block)) < 0)
return ret;
// Note motion_val is normally NULL unless we want to extract the MVs.
if (s->current_picture.motion_val[0] && !s->encoding) {
const int wrap = s->b8_stride;
int xy = s->mb_x * 2 + s->mb_y * 2 * wrap;
int b8_xy = 4 * (s->mb_x + s->mb_y * s->mb_stride);
int motion_x, motion_y, dir, i;
for (i = 0; i < 2; i++) {
for (dir = 0; dir < 2; dir++) {
if (s->mb_intra ||
(dir == 1 && s->pict_type != AV_PICTURE_TYPE_B)) {
motion_x = motion_y = 0;
} else if (s->mv_type == MV_TYPE_16X16 ||
(s->mv_type == MV_TYPE_FIELD && field_pic)) {
motion_x = s->mv[dir][0][0];
motion_y = s->mv[dir][0][1];
} else { /* if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8)) */
motion_x = s->mv[dir][i][0];
motion_y = s->mv[dir][i][1];
}
s->current_picture.motion_val[dir][xy][0] = motion_x;
s->current_picture.motion_val[dir][xy][1] = motion_y;
s->current_picture.motion_val[dir][xy + 1][0] = motion_x;
s->current_picture.motion_val[dir][xy + 1][1] = motion_y;
s->current_picture.ref_index [dir][b8_xy] =
s->current_picture.ref_index [dir][b8_xy + 1] = s->field_select[dir][i];
assert(s->field_select[dir][i] == 0 ||
s->field_select[dir][i] == 1);
}
xy += wrap;
b8_xy += 2;
}
}
s->dest[0] += 16;
s->dest[1] += 16 >> s->chroma_x_shift;
s->dest[2] += 16 >> s->chroma_x_shift;
ff_mpv_decode_mb(s, s->block);
if (++s->mb_x >= s->mb_width) {
const int mb_size = 16;
ff_mpeg_draw_horiz_band(s, mb_size * (s->mb_y >> field_pic), mb_size);
ff_mpv_report_decode_progress(s);
s->mb_x = 0;
s->mb_y += 1 << field_pic;
if (s->mb_y >= s->mb_height) {
int left = get_bits_left(&s->gb);
int is_d10 = s->chroma_format == 2 &&
s->pict_type == AV_PICTURE_TYPE_I &&
avctx->profile == 0 && avctx->level == 5 &&
s->intra_dc_precision == 2 &&
s->q_scale_type == 1 && s->alternate_scan == 0 &&
s->progressive_frame == 0
/* vbv_delay == 0xBBB || 0xE10 */;
if (left < 0 ||
(left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10) ||
((avctx->err_recognition & AV_EF_BUFFER) && left > 8)) {
av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X\n",
left, show_bits(&s->gb, FFMIN(left, 23)));
return AVERROR_INVALIDDATA;
} else
goto eos;
}
ff_init_block_index(s);
}
/* skip mb handling */
if (s->mb_skip_run == -1) {
/* read increment again */
s->mb_skip_run = 0;
for (;;) {
int code = get_vlc2(&s->gb, ff_mbincr_vlc.table,
MBINCR_VLC_BITS, 2);
if (code < 0) {
av_log(s->avctx, AV_LOG_ERROR, "mb incr damaged\n");
return AVERROR_INVALIDDATA;
}
if (code >= 33) {
if (code == 33) {
s->mb_skip_run += 33;
} else if (code == 35) {
if (s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0) {
av_log(s->avctx, AV_LOG_ERROR, "slice mismatch\n");
return AVERROR_INVALIDDATA;
}
goto eos; /* end of slice */
}
/* otherwise, stuffing, nothing to do */
} else {
s->mb_skip_run += code;
break;
}
}
if (s->mb_skip_run) {
int i;
if (s->pict_type == AV_PICTURE_TYPE_I) {
av_log(s->avctx, AV_LOG_ERROR,
"skipped MB in I-frame at %d %d\n", s->mb_x, s->mb_y);
return AVERROR_INVALIDDATA;
}
/* skip mb */
s->mb_intra = 0;
for (i = 0; i < 12; i++)
s->block_last_index[i] = -1;
if (s->picture_structure == PICT_FRAME)
s->mv_type = MV_TYPE_16X16;
else
s->mv_type = MV_TYPE_FIELD;
if (s->pict_type == AV_PICTURE_TYPE_P) {
/* if P type, zero motion vector is implied */
s->mv_dir = MV_DIR_FORWARD;
s->mv[0][0][0] = s->mv[0][0][1] = 0;
s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0;
s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0;
s->field_select[0][0] = (s->picture_structure - 1) & 1;
} else {
/* if B type, reuse previous vectors and directions */
s->mv[0][0][0] = s->last_mv[0][0][0];
s->mv[0][0][1] = s->last_mv[0][0][1];
s->mv[1][0][0] = s->last_mv[1][0][0];
s->mv[1][0][1] = s->last_mv[1][0][1];
}
}
}
}
eos: // end of slice
*buf += (get_bits_count(&s->gb) - 1) / 8;
ff_dlog(s, "y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
return 0;
}
static int slice_decode_thread(AVCodecContext *c, void *arg)
{
MpegEncContext *s = *(void **) arg;
const uint8_t *buf = s->gb.buffer;
int mb_y = s->start_mb_y;
const int field_pic = s->picture_structure != PICT_FRAME;
s->er.error_count = (3 * (s->end_mb_y - s->start_mb_y) * s->mb_width) >> field_pic;
for (;;) {
uint32_t start_code;
int ret;
ret = mpeg_decode_slice(s, mb_y, &buf, s->gb.buffer_end - buf);
emms_c();
ff_dlog(c, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y,
s->start_mb_y, s->end_mb_y, s->er.error_count);
if (ret < 0) {
if (c->err_recognition & AV_EF_EXPLODE)
return ret;
if (s->resync_mb_x >= 0 && s->resync_mb_y >= 0)
ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
s->mb_x, s->mb_y,
ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
} else {
ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y,
s->mb_x - 1, s->mb_y,
ER_AC_END | ER_DC_END | ER_MV_END);
}
if (s->mb_y == s->end_mb_y)
return 0;
start_code = -1;
buf = avpriv_find_start_code(buf, s->gb.buffer_end, &start_code);
mb_y = (start_code - SLICE_MIN_START_CODE) << field_pic;
if (s->picture_structure == PICT_BOTTOM_FIELD)
mb_y++;
if (mb_y < 0 || mb_y >= s->end_mb_y)
return AVERROR_INVALIDDATA;
}
}
/**
* Handle slice ends.
* @return 1 if it seems to be the last slice
*/
static int slice_end(AVCodecContext *avctx, AVFrame *pict)
{
Mpeg1Context *s1 = avctx->priv_data;
MpegEncContext *s = &s1->mpeg_enc_ctx;
if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr)
return 0;
if (s->avctx->hwaccel) {
if (s->avctx->hwaccel->end_frame(s->avctx) < 0)
av_log(avctx, AV_LOG_ERROR,
"hardware accelerator failed to decode picture\n");
}
/* end of slice reached */
if (/* s->mb_y << field_pic == s->mb_height && */ !s->first_field) {
/* end of image */
ff_er_frame_end(&s->er);
ff_mpv_frame_end(s);
if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
int ret = av_frame_ref(pict, s->current_picture_ptr->f);
if (ret < 0)
return ret;
ff_print_debug_info(s, s->current_picture_ptr);
} else {
if (avctx->active_thread_type & FF_THREAD_FRAME)
s->picture_number++;
/* latency of 1 frame for I- and P-frames */
/* XXX: use another variable than picture_number */
if (s->last_picture_ptr) {
int ret = av_frame_ref(pict, s->last_picture_ptr->f);
if (ret < 0)
return ret;
ff_print_debug_info(s, s->last_picture_ptr);
}
}
return 1;
} else {
return 0;
}
}
static int mpeg1_decode_sequence(AVCodecContext *avctx,
const uint8_t *buf, int buf_size)
{
Mpeg1Context *s1 = avctx->priv_data;
MpegEncContext *s = &s1->mpeg_enc_ctx;
int width, height;
int i, v, j;
init_get_bits(&s->gb, buf, buf_size * 8);
width = get_bits(&s->gb, 12);
height = get_bits(&s->gb, 12);
if (width == 0 || height == 0) {
av_log(avctx, AV_LOG_WARNING,
"Invalid horizontal or vertical size value.\n");
if (avctx->err_recognition & AV_EF_BITSTREAM)
return AVERROR_INVALIDDATA;
}
s->aspect_ratio_info = get_bits(&s->gb, 4);
if (s->aspect_ratio_info == 0) {
av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
if (avctx->err_recognition & AV_EF_BITSTREAM)
return AVERROR_INVALIDDATA;
}
s->frame_rate_index = get_bits(&s->gb, 4);
if (s->frame_rate_index == 0 || s->frame_rate_index > 13) {
av_log(avctx, AV_LOG_WARNING,
"frame_rate_index %d is invalid\n", s->frame_rate_index);
return AVERROR_INVALIDDATA;
}
s->bit_rate = get_bits(&s->gb, 18) * 400;
if (get_bits1(&s->gb) == 0) { /* marker */
av_log(avctx, AV_LOG_ERROR, "Marker in sequence header missing\n");
return AVERROR_INVALIDDATA;
}
s->width = width;
s->height = height;
s->avctx->rc_buffer_size = get_bits(&s->gb, 10) * 1024 * 16;
skip_bits(&s->gb, 1);
/* get matrix */
if (get_bits1(&s->gb)) {
load_matrix(s, s->chroma_intra_matrix, s->intra_matrix, 1);
} else {
for (i = 0; i < 64; i++) {
j = s->idsp.idct_permutation[i];
v = ff_mpeg1_default_intra_matrix[i];
s->intra_matrix[j] = v;
s->chroma_intra_matrix[j] = v;
}
}
if (get_bits1(&s->gb)) {
load_matrix(s, s->chroma_inter_matrix, s->inter_matrix, 0);
} else {
for (i = 0; i < 64; i++) {
int j = s->idsp.idct_permutation[i];
v = ff_mpeg1_default_non_intra_matrix[i];
s->inter_matrix[j] = v;
s->chroma_inter_matrix[j] = v;
}
}
if (show_bits(&s->gb, 23) != 0) {
av_log(s->avctx, AV_LOG_ERROR, "sequence header damaged\n");
return AVERROR_INVALIDDATA;
}
/* We set MPEG-2 parameters so that it emulates MPEG-1. */
s->progressive_sequence = 1;
s->progressive_frame = 1;
s->picture_structure = PICT_FRAME;
s->frame_pred_frame_dct = 1;
s->chroma_format = 1;
s->codec_id =
s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
s->out_format = FMT_MPEG1;
if (s->avctx->flags & AV_CODEC_FLAG_LOW_DELAY)
s->low_delay = 1;
if (s->avctx->debug & FF_DEBUG_PICT_INFO)
av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%d\n",
s->avctx->rc_buffer_size, s->bit_rate);
return 0;
}
static int vcr2_init_sequence(AVCodecContext *avctx)
{
Mpeg1Context *s1 = avctx->priv_data;
MpegEncContext *s = &s1->mpeg_enc_ctx;
int i, v, ret;
/* start new MPEG-1 context decoding */
s->out_format = FMT_MPEG1;
if (s1->mpeg_enc_ctx_allocated) {
ff_mpv_common_end(s);
}
s->width = avctx->coded_width;
s->height = avctx->coded_height;
avctx->has_b_frames = 0; // true?
s->low_delay = 1;
avctx->pix_fmt = mpeg_get_pixelformat(avctx);
if (avctx->hwaccel && avctx->idct_algo == FF_IDCT_AUTO)
avctx->idct_algo = FF_IDCT_SIMPLE;
ff_mpv_idct_init(s);
if ((ret = ff_mpv_common_init(s)) < 0)
return ret;
s1->mpeg_enc_ctx_allocated = 1;
for (i = 0; i < 64; i++) {
int j = s->idsp.idct_permutation[i];
v = ff_mpeg1_default_intra_matrix[i];
s->intra_matrix[j] = v;
s->chroma_intra_matrix[j] = v;
v = ff_mpeg1_default_non_intra_matrix[i];
s->inter_matrix[j] = v;
s->chroma_inter_matrix[j] = v;
}
s->progressive_sequence = 1;
s->progressive_frame = 1;
s->picture_structure = PICT_FRAME;
s->frame_pred_frame_dct = 1;
s->chroma_format = 1;
s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG2VIDEO;
s1->save_width = s->width;
s1->save_height = s->height;
s1->save_progressive_seq = s->progressive_sequence;
return 0;
}
static int mpeg_decode_a53_cc(AVCodecContext *avctx,
const uint8_t *p, int buf_size)
{
Mpeg1Context *s1 = avctx->priv_data;
if (buf_size >= 6 &&
p[0] == 'G' && p[1] == 'A' && p[2] == '9' && p[3] == '4' &&
p[4] == 3 && (p[5] & 0x40)) {
/* extract A53 Part 4 CC data */
int cc_count = p[5] & 0x1f;
if (cc_count > 0 && buf_size >= 7 + cc_count * 3) {
av_freep(&s1->a53_caption);
s1->a53_caption_size = cc_count * 3;
s1->a53_caption = av_malloc(s1->a53_caption_size);
if (s1->a53_caption)
memcpy(s1->a53_caption, p + 7, s1->a53_caption_size);
}
return 1;
} else if (buf_size >= 11 &&
p[0] == 'C' && p[1] == 'C' && p[2] == 0x01 && p[3] == 0xf8) {
/* extract DVD CC data */
int cc_count = 0;
int i;
// There is a caption count field in the data, but it is often
// incorrect. So count the number of captions present.
for (i = 5; i + 6 <= buf_size && ((p[i] & 0xfe) == 0xfe); i += 6)
cc_count++;
// Transform the DVD format into A53 Part 4 format
if (cc_count > 0) {
av_freep(&s1->a53_caption);
s1->a53_caption_size = cc_count * 6;
s1->a53_caption = av_malloc(s1->a53_caption_size);
if (s1->a53_caption) {
uint8_t field1 = !!(p[4] & 0x80);
uint8_t *cap = s1->a53_caption;
p += 5;
for (i = 0; i < cc_count; i++) {
cap[0] = (p[0] == 0xff && field1) ? 0xfc : 0xfd;
cap[1] = p[1];
cap[2] = p[2];
cap[3] = (p[3] == 0xff && !field1) ? 0xfc : 0xfd;
cap[4] = p[4];
cap[5] = p[5];
cap += 6;
p += 6;
}
}
}
return 1;
}
return 0;
}
static void mpeg_decode_user_data(AVCodecContext *avctx,
const uint8_t *p, int buf_size)
{
const uint8_t *buf_end = p + buf_size;
Mpeg1Context *s1 = avctx->priv_data;
/* we parse the DTG active format information */
if (buf_end - p >= 5 &&
p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
int flags = p[4];
p += 5;
if (flags & 0x80) {
/* skip event id */
p += 2;
}
if (flags & 0x40) {
if (buf_end - p < 1)
return;
s1->has_afd = 1;
s1->afd = p[0] & 0x0f;
}
} else if (buf_end - p >= 6 &&
p[0] == 'J' && p[1] == 'P' && p[2] == '3' && p[3] == 'D' &&
p[4] == 0x03) { // S3D_video_format_length
// the 0x7F mask ignores the reserved_bit value
const uint8_t S3D_video_format_type = p[5] & 0x7F;
if (S3D_video_format_type == 0x03 ||
S3D_video_format_type == 0x04 ||
S3D_video_format_type == 0x08 ||
S3D_video_format_type == 0x23) {
s1->has_stereo3d = 1;
switch (S3D_video_format_type) {
case 0x03:
s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE;
break;
case 0x04:
s1->stereo3d.type = AV_STEREO3D_TOPBOTTOM;
break;
case 0x08:
s1->stereo3d.type = AV_STEREO3D_2D;
break;
case 0x23:
s1->stereo3d.type = AV_STEREO3D_SIDEBYSIDE_QUINCUNX;
break;
}
}
} else if (mpeg_decode_a53_cc(avctx, p, buf_size)) {
return;
}
}
static void mpeg_decode_gop(AVCodecContext *avctx,
const uint8_t *buf, int buf_size)
{
Mpeg1Context *s1 = avctx->priv_data;
MpegEncContext *s = &s1->mpeg_enc_ctx;
int time_code_hours, time_code_minutes;
int time_code_seconds, time_code_pictures;
int broken_link;
init_get_bits(&s->gb, buf, buf_size * 8);
skip_bits1(&s->gb); /* drop_frame_flag */
time_code_hours = get_bits(&s->gb, 5);
time_code_minutes = get_bits(&s->gb, 6);
skip_bits1(&s->gb); // marker bit
time_code_seconds = get_bits(&s->gb, 6);
time_code_pictures = get_bits(&s->gb, 6);
s1->closed_gop = get_bits1(&s->gb);
/* broken_link indicate that after editing the
* reference frames of the first B-Frames after GOP I-Frame
* are missing (open gop) */
broken_link = get_bits1(&s->gb);
if (s->avctx->debug & FF_DEBUG_PICT_INFO)
av_log(s->avctx, AV_LOG_DEBUG,
"GOP (%2d:%02d:%02d.[%02d]) closed_gop=%d broken_link=%d\n",
time_code_hours, time_code_minutes, time_code_seconds,
time_code_pictures, s1->closed_gop, broken_link);
}
static int decode_chunks(AVCodecContext *avctx, AVFrame *picture,
int *got_output, const uint8_t *buf, int buf_size)
{
Mpeg1Context *s = avctx->priv_data;
MpegEncContext *s2 = &s->mpeg_enc_ctx;
const uint8_t *buf_ptr = buf;
const uint8_t *buf_end = buf + buf_size;
int ret, input_size;
int last_code = 0, skip_frame = 0;
for (;;) {
/* find next start code */
uint32_t start_code = -1;
buf_ptr = avpriv_find_start_code(buf_ptr, buf_end, &start_code);
if (start_code > 0x1ff) {
if (!skip_frame) {
if (HAVE_THREADS &&
(avctx->active_thread_type & FF_THREAD_SLICE) &&
!avctx->hwaccel) {
int i;
avctx->execute(avctx, slice_decode_thread,
&s2->thread_context[0], NULL,
s->slice_count, sizeof(void *));
for (i = 0; i < s->slice_count; i++)
s2->er.error_count += s2->thread_context[i]->er.error_count;
}
ret = slice_end(avctx, picture);
if (ret < 0)
return ret;
else if (ret) {
// FIXME: merge with the stuff in mpeg_decode_slice
if (s2->last_picture_ptr || s2->low_delay)
*got_output = 1;
}
}
s2->pict_type = 0;
return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index);
}
input_size = buf_end - buf_ptr;
if (avctx->debug & FF_DEBUG_STARTCODE)
av_log(avctx, AV_LOG_DEBUG, "%3"PRIX32" at %td left %d\n",
start_code, buf_ptr - buf, input_size);
/* prepare data for next start code */
switch (start_code) {
case SEQ_START_CODE:
if (last_code == 0) {
mpeg1_decode_sequence(avctx, buf_ptr, input_size);
s->sync = 1;
} else {
av_log(avctx, AV_LOG_ERROR,
"ignoring SEQ_START_CODE after %X\n", last_code);
if (avctx->err_recognition & AV_EF_EXPLODE)
return AVERROR_INVALIDDATA;
}
break;
case PICTURE_START_CODE:
if (s2->width <= 0 || s2->height <= 0) {
av_log(avctx, AV_LOG_ERROR, "Invalid frame dimensions %dx%d.\n",
s2->width, s2->height);
return AVERROR_INVALIDDATA;
}
if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) &&
!avctx->hwaccel && s->slice_count) {
int i;
avctx->execute(avctx, slice_decode_thread,
s2->thread_context, NULL,
s->slice_count, sizeof(void *));
for (i = 0; i < s->slice_count; i++)
s2->er.error_count += s2->thread_context[i]->er.error_count;
s->slice_count = 0;
}
if (last_code == 0 || last_code == SLICE_MIN_START_CODE) {
ret = mpeg_decode_postinit(avctx);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR,
"mpeg_decode_postinit() failure\n");
return ret;
}
/* We have a complete image: we try to decompress it. */
if (mpeg1_decode_picture(avctx, buf_ptr, input_size) < 0)
s2->pict_type = 0;
s->first_slice = 1;
last_code = PICTURE_START_CODE;
} else {
av_log(avctx, AV_LOG_ERROR,
"ignoring pic after %X\n", last_code);
if (avctx->err_recognition & AV_EF_EXPLODE)
return AVERROR_INVALIDDATA;
}
break;
case EXT_START_CODE:
init_get_bits(&s2->gb, buf_ptr, input_size * 8);
switch (get_bits(&s2->gb, 4)) {
case 0x1:
if (last_code == 0) {
mpeg_decode_sequence_extension(s);
} else {
av_log(avctx, AV_LOG_ERROR,
"ignoring seq ext after %X\n", last_code);
if (avctx->err_recognition & AV_EF_EXPLODE)
return AVERROR_INVALIDDATA;
}
break;
case 0x2:
mpeg_decode_sequence_display_extension(s);
break;
case 0x3:
mpeg_decode_quant_matrix_extension(s2);
break;
case 0x7:
mpeg_decode_picture_display_extension(s);
break;
case 0x8:
if (last_code == PICTURE_START_CODE) {
mpeg_decode_picture_coding_extension(s);
} else {
av_log(avctx, AV_LOG_ERROR,
"ignoring pic cod ext after %X\n", last_code);
if (avctx->err_recognition & AV_EF_EXPLODE)
return AVERROR_INVALIDDATA;
}
break;
}
break;
case USER_START_CODE:
mpeg_decode_user_data(avctx, buf_ptr, input_size);
break;
case GOP_START_CODE:
if (last_code == 0) {
s2->first_field = 0;
mpeg_decode_gop(avctx, buf_ptr, input_size);
s->sync = 1;
} else {
av_log(avctx, AV_LOG_ERROR,
"ignoring GOP_START_CODE after %X\n", last_code);
if (avctx->err_recognition & AV_EF_EXPLODE)
return AVERROR_INVALIDDATA;
}
break;
default:
if (start_code >= SLICE_MIN_START_CODE &&
start_code <= SLICE_MAX_START_CODE && last_code != 0) {
const int field_pic = s2->picture_structure != PICT_FRAME;
int mb_y = (start_code - SLICE_MIN_START_CODE) << field_pic;
last_code = SLICE_MIN_START_CODE;
if (s2->picture_structure == PICT_BOTTOM_FIELD)
mb_y++;
if (mb_y >= s2->mb_height) {
av_log(s2->avctx, AV_LOG_ERROR,
"slice below image (%d >= %d)\n", mb_y, s2->mb_height);
return AVERROR_INVALIDDATA;
}
if (!s2->last_picture_ptr) {
/* Skip B-frames if we do not have reference frames and
* GOP is not closed. */
if (s2->pict_type == AV_PICTURE_TYPE_B) {
if (!s->closed_gop) {
skip_frame = 1;
break;
}
}
}
if (s2->pict_type == AV_PICTURE_TYPE_I)
s->sync = 1;
if (!s2->next_picture_ptr) {
/* Skip P-frames if we do not have a reference frame or
* we have an invalid header. */
if (s2->pict_type == AV_PICTURE_TYPE_P && !s->sync) {
skip_frame = 1;
break;
}
}
if ((avctx->skip_frame >= AVDISCARD_NONREF &&
s2->pict_type == AV_PICTURE_TYPE_B) ||
(avctx->skip_frame >= AVDISCARD_NONKEY &&
s2->pict_type != AV_PICTURE_TYPE_I) ||
avctx->skip_frame >= AVDISCARD_ALL) {
skip_frame = 1;
break;
}
if (!s->mpeg_enc_ctx_allocated)
break;
if (s2->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
if (mb_y < avctx->skip_top ||
mb_y >= s2->mb_height - avctx->skip_bottom)
break;
}
if (!s2->pict_type) {
av_log(avctx, AV_LOG_ERROR, "Missing picture start code\n");
if (avctx->err_recognition & AV_EF_EXPLODE)
return AVERROR_INVALIDDATA;
break;
}
if (s->first_slice) {
skip_frame = 0;
s->first_slice = 0;
if ((ret = mpeg_field_start(s2, buf, buf_size)) < 0)
return ret;
}
if (!s2->current_picture_ptr) {
av_log(avctx, AV_LOG_ERROR,
"current_picture not initialized\n");
return AVERROR_INVALIDDATA;
}
if (HAVE_THREADS &&
(avctx->active_thread_type & FF_THREAD_SLICE) &&
!avctx->hwaccel) {
int threshold = (s2->mb_height * s->slice_count +
s2->slice_context_count / 2) /
s2->slice_context_count;
if (threshold <= mb_y) {
MpegEncContext *thread_context = s2->thread_context[s->slice_count];
thread_context->start_mb_y = mb_y;
thread_context->end_mb_y = s2->mb_height;
if (s->slice_count) {
s2->thread_context[s->slice_count - 1]->end_mb_y = mb_y;
ret = ff_update_duplicate_context(thread_context, s2);
if (ret < 0)
return ret;
}
init_get_bits(&thread_context->gb, buf_ptr, input_size * 8);
s->slice_count++;
}
buf_ptr += 2; // FIXME add minimum number of bytes per slice
} else {
ret = mpeg_decode_slice(s2, mb_y, &buf_ptr, input_size);
emms_c();
if (ret < 0) {
if (avctx->err_recognition & AV_EF_EXPLODE)
return ret;
if (s2->resync_mb_x >= 0 && s2->resync_mb_y >= 0)
ff_er_add_slice(&s2->er, s2->resync_mb_x,
s2->resync_mb_y, s2->mb_x, s2->mb_y,
ER_AC_ERROR | ER_DC_ERROR | ER_MV_ERROR);
} else {
ff_er_add_slice(&s2->er, s2->resync_mb_x,
s2->resync_mb_y, s2->mb_x - 1, s2->mb_y,
ER_AC_END | ER_DC_END | ER_MV_END);
}
}
}
break;
}
}
}
static int mpeg_decode_frame(AVCodecContext *avctx, void *data,
int *got_output, AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
Mpeg1Context *s = avctx->priv_data;
AVFrame *picture = data;
MpegEncContext *s2 = &s->mpeg_enc_ctx;
ff_dlog(avctx, "fill_buffer\n");
if (buf_size == 0 || (buf_size == 4 && AV_RB32(buf) == SEQ_END_CODE)) {
/* special case for last picture */
if (s2->low_delay == 0 && s2->next_picture_ptr) {
int ret = av_frame_ref(picture, s2->next_picture_ptr->f);
if (ret < 0)
return ret;
s2->next_picture_ptr = NULL;
*got_output = 1;
}
return buf_size;
}
if (s2->avctx->flags & AV_CODEC_FLAG_TRUNCATED) {
int next = ff_mpeg1_find_frame_end(&s2->parse_context, buf,
buf_size, NULL);
if (ff_combine_frame(&s2->parse_context, next,
(const uint8_t **) &buf, &buf_size) < 0)
return buf_size;
}
if (s->mpeg_enc_ctx_allocated == 0 && avctx->codec_tag == AV_RL32("VCR2"))
vcr2_init_sequence(avctx);
s->slice_count = 0;
if (avctx->extradata && !s->extradata_decoded) {
int ret = decode_chunks(avctx, picture, got_output,
avctx->extradata, avctx->extradata_size);
s->extradata_decoded = 1;
if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE))
return ret;
}
return decode_chunks(avctx, picture, got_output, buf, buf_size);
}
static void flush(AVCodecContext *avctx)
{
Mpeg1Context *s = avctx->priv_data;
s->sync = 0;
s->closed_gop = 0;
ff_mpeg_flush(avctx);
}
static av_cold int mpeg_decode_end(AVCodecContext *avctx)
{
Mpeg1Context *s = avctx->priv_data;
if (s->mpeg_enc_ctx_allocated)
ff_mpv_common_end(&s->mpeg_enc_ctx);
av_freep(&s->a53_caption);
return 0;
}
AVCodec ff_mpeg1video_decoder = {
.name = "mpeg1video",
.long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_MPEG1VIDEO,
.priv_data_size = sizeof(Mpeg1Context),
.init = mpeg_decode_init,
.close = mpeg_decode_end,
.decode = mpeg_decode_frame,
.capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |
AV_CODEC_CAP_SLICE_THREADS,
.flush = flush,
.update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg_decode_update_thread_context)
};
AVCodec ff_mpeg2video_decoder = {
.name = "mpeg2video",
.long_name = NULL_IF_CONFIG_SMALL("MPEG-2 video"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_MPEG2VIDEO,
.priv_data_size = sizeof(Mpeg1Context),
.init = mpeg_decode_init,
.close = mpeg_decode_end,
.decode = mpeg_decode_frame,
.capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
AV_CODEC_CAP_TRUNCATED | AV_CODEC_CAP_DELAY |
AV_CODEC_CAP_SLICE_THREADS,
.flush = flush,
.profiles = NULL_IF_CONFIG_SMALL(ff_mpeg2_video_profiles),
};
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