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FFmpeg/libavcodec/mpeg12dec.c
Marth64 0b342a2f15 avcodec/mpeg12dec: extract only one type of CC substream 
In MPEG-2 user data, there can be different types of Closed Captions
formats embedded (A53, SCTE-20, or DVD). The current behavior of the
CC extraction code in the MPEG-2 decoder is to not be aware of
multiple formats if multiple exist, therefore allowing one format
to overwrite the other during the extraction process since the CC
extraction shares one output buffer for the normalized bytes.

This causes sources that have two CC formats to produce flawed output.
There exist real-world samples which contain both A53 and SCTE-20 captions
in the same MPEG-2 stream, and that manifest this problem. Example of symptom:
THANK YOU (expected) --> THTHANANK K YOYOUU (actual)

The solution is to pick only the first CC substream observed with valid bytes,
and ignore the other types. Additionally, provide an option for users
to manually "force" a type in the event that this matters for a particular
source.

Signed-off-by: Marth64 <marth64@proxyid.net>
2024-03-19 15:52:05 +01:00

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/*
* MPEG-1/2 decoder
* Copyright (c) 2000, 2001 Fabrice Bellard
* Copyright (c) 2002-2013 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
*/
/**
* @file
* MPEG-1/2 decoder
*/
#include "config_components.h"
#define UNCHECKED_BITSTREAM_READER 1
#include <inttypes.h>
#include "libavutil/attributes.h"
#include "libavutil/emms.h"
#include "libavutil/imgutils.h"
#include "libavutil/internal.h"
#include "libavutil/mem_internal.h"
#include "libavutil/reverse.h"
#include "libavutil/stereo3d.h"
#include "libavutil/timecode.h"
#include "avcodec.h"
#include "codec_internal.h"
#include "decode.h"
#include "error_resilience.h"
#include "hwaccel_internal.h"
#include "hwconfig.h"
#include "idctdsp.h"
#include "internal.h"
#include "mpeg_er.h"
#include "mpeg12.h"
#include "mpeg12codecs.h"
#include "mpeg12data.h"
#include "mpeg12dec.h"
#include "mpegutils.h"
#include "mpegvideo.h"
#include "mpegvideodata.h"
#include "mpegvideodec.h"
#include "profiles.h"
#include "startcode.h"
#include "thread.h"
#define A53_MAX_CC_COUNT 2000
enum Mpeg2ClosedCaptionsFormat {
CC_FORMAT_AUTO,
CC_FORMAT_A53_PART4,
CC_FORMAT_SCTE20,
CC_FORMAT_DVD
};
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;
AVBufferRef *a53_buf_ref;
enum Mpeg2ClosedCaptionsFormat cc_format;
uint8_t afd;
int has_afd;
int slice_count;
unsigned aspect_ratio_info;
AVRational save_aspect;
int save_width, save_height, save_progressive_seq;
AVRational frame_rate_ext; /* MPEG-2 specific framerate modificator */
unsigned frame_rate_index;
int sync; /* Did we reach a sync point like a GOP/SEQ/KEYFrame? */
int closed_gop;
int tmpgexs;
int first_slice;
int extradata_decoded;
int64_t timecode_frame_start; /*< GOP timecode frame start number, in non drop frame format */
} 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,
};
/* 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, 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;
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, ff_mpeg1_rl_vlc,
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 mpeg2_decode_block_non_intra(MpegEncContext *s,
int16_t *block, int n)
{
int level, i, j, run;
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, ff_mpeg1_rl_vlc,
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_decode_block_intra(MpegEncContext *s,
int16_t *block, int n)
{
int level, dc, diff, i, j, run;
int component;
const RL_VLC_ELEM *rl_vlc;
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);
dc = s->last_dc[component];
dc += diff;
s->last_dc[component] = dc;
block[0] = dc * (1 << (3 - s->intra_dc_precision));
ff_tlog(s->avctx, "dc=%d\n", block[0]);
mismatch = block[0] ^ 1;
i = 0;
if (s->intra_vlc_format)
rl_vlc = ff_mpeg2_rl_vlc;
else
rl_vlc = ff_mpeg1_rl_vlc;
{
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_vlc,
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;
SKIP_BITS(re, &s->gb, 6);
level = SHOW_SBITS(re, &s->gb, 12);
LAST_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;
}
/******************************************/
/* decoding */
static inline int get_dmv(MpegEncContext *s)
{
if (get_bits1(&s->gb))
return 1 - (get_bits1(&s->gb) << 1);
else
return 0;
}
/* 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_tlog(s->avctx, "decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y);
av_assert2(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)) {
av_log(s->avctx, AV_LOG_ERROR, "skip with previntra\n");
return AVERROR_INVALIDDATA;
}
s->current_picture.mb_type[s->mb_x + s->mb_y * s->mb_stride] =
mb_type | MB_TYPE_SKIP;
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, 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, 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_tlog(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 = mpeg_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]);
check_marker(s->avctx, &s->gb, "after concealment_motion_vectors");
} 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) {
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) {
av_assert2(mb_type & MB_TYPE_CBP);
s->mv_dir = MV_DIR_FORWARD;
if (s->picture_structure == PICT_FRAME) {
if (s->picture_structure == PICT_FRAME
&& !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 = mpeg_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 {
av_assert2(mb_type & MB_TYPE_L0L1);
// FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED
/* get additional motion vector type */
if (s->picture_structure == PICT_FRAME && 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 = mpeg_get_qscale(s);
/* motion vectors */
s->mv_dir = (mb_type >> 13) & 3;
ff_tlog(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] *= 2;
s->mv[i][0][1] *= 2;
}
}
}
} 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_tlog(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] = 2 * val;
s->mv[i][j][1] = val;
ff_tlog(s->avctx, "fmy=%d\n", val);
}
}
}
} else {
av_assert0(!s->progressive_sequence);
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:
if (s->progressive_sequence){
av_log(s->avctx, AV_LOG_ERROR, "MT_DMV in progressive_sequence\n");
return AVERROR_INVALIDDATA;
}
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 * (1 << my_shift);
s->last_mv[i][1][1] = my * (1 << 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, MB_PAT_VLC_BITS, 1);
if (mb_block_count > 6) {
cbp *= 1 << 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 %d at %d %d\n", cbp, s->mb_x, s->mb_y);
return AVERROR_INVALIDDATA;
}
if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
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 {
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;
if ( avctx->codec_tag != AV_RL32("VCR2")
&& avctx->codec_tag != AV_RL32("BW10"))
avctx->coded_width = avctx->coded_height = 0; // do not trust dimensions from input
ff_mpv_decode_init(s2, avctx);
ff_mpeg12_init_vlcs();
s2->chroma_format = 1;
s->mpeg_enc_ctx_allocated = 0;
s->repeat_field = 0;
avctx->color_range = AVCOL_RANGE_MPEG;
return 0;
}
#if HAVE_THREADS
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)
memcpy(s + 1, s1 + 1, sizeof(Mpeg1Context) - sizeof(MpegEncContext));
return 0;
}
#endif
static const enum AVPixelFormat mpeg1_hwaccel_pixfmt_list_420[] = {
#if CONFIG_MPEG1_NVDEC_HWACCEL
AV_PIX_FMT_CUDA,
#endif
#if CONFIG_MPEG1_VDPAU_HWACCEL
AV_PIX_FMT_VDPAU,
#endif
AV_PIX_FMT_YUV420P,
AV_PIX_FMT_NONE
};
static const enum AVPixelFormat mpeg2_hwaccel_pixfmt_list_420[] = {
#if CONFIG_MPEG2_NVDEC_HWACCEL
AV_PIX_FMT_CUDA,
#endif
#if CONFIG_MPEG2_VDPAU_HWACCEL
AV_PIX_FMT_VDPAU,
#endif
#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_D3D12VA_HWACCEL
AV_PIX_FMT_D3D12,
#endif
#if CONFIG_MPEG2_VAAPI_HWACCEL
AV_PIX_FMT_VAAPI,
#endif
#if CONFIG_MPEG2_VIDEOTOOLBOX_HWACCEL
AV_PIX_FMT_VIDEOTOOLBOX,
#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 (CONFIG_GRAY && (avctx->flags & AV_CODEC_FLAG_GRAY))
return AV_PIX_FMT_GRAY8;
if (s->chroma_format < 2)
pix_fmts = avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO ?
mpeg1_hwaccel_pixfmt_list_420 :
mpeg2_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;
int ret;
if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
// MPEG-1 aspect
AVRational aspect_inv = av_d2q(ff_mpeg1_aspect[s1->aspect_ratio_info], 255);
avctx->sample_aspect_ratio = (AVRational) { aspect_inv.den, aspect_inv.num };
} else { // MPEG-2
// MPEG-2 aspect
if (s1->aspect_ratio_info > 1) {
AVRational dar =
av_mul_q(av_div_q(ff_mpeg2_aspect[s1->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[s1->aspect_ratio_info],
(AVRational) { s->width, s->height });
} else {
s->avctx->sample_aspect_ratio =
av_div_q(ff_mpeg2_aspect[s1->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, "aspect A %d/%d\n",
ff_mpeg2_aspect[s1->aspect_ratio_info].num,
ff_mpeg2_aspect[s1->aspect_ratio_info].den);
ff_dlog(avctx, "aspect 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[s1->aspect_ratio_info];
}
} // MPEG-2
if (av_image_check_sar(s->width, s->height,
avctx->sample_aspect_ratio) < 0) {
av_log(avctx, AV_LOG_WARNING, "ignoring invalid SAR: %u/%u\n",
avctx->sample_aspect_ratio.num,
avctx->sample_aspect_ratio.den);
avctx->sample_aspect_ratio = (AVRational){ 0, 1 };
}
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 ||
av_cmp_q(s1->save_aspect, s->avctx->sample_aspect_ratio) ||
(s1->save_progressive_seq != s->progressive_sequence && FFALIGN(s->height, 16) != FFALIGN(s->height, 32)) ||
0) {
if (s1->mpeg_enc_ctx_allocated) {
ff_mpv_common_end(s);
s1->mpeg_enc_ctx_allocated = 0;
}
ret = ff_set_dimensions(avctx, s->width, s->height);
if (ret < 0)
return ret;
if (avctx->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->bit_rate &&
(s->bit_rate != 0x3FFFF*400)) {
avctx->rc_max_rate = s->bit_rate;
} else if (avctx->codec_id == AV_CODEC_ID_MPEG1VIDEO && s->bit_rate &&
(s->bit_rate != 0x3FFFF*400 || s->vbv_delay != 0xFFFF)) {
avctx->bit_rate = s->bit_rate;
}
s1->save_aspect = s->avctx->sample_aspect_ratio;
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[s1->frame_rate_index];
#if FF_API_TICKS_PER_FRAME
FF_DISABLE_DEPRECATION_WARNINGS
avctx->ticks_per_frame = 1;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
} else { // MPEG-2
// MPEG-2 fps
av_reduce(&s->avctx->framerate.num,
&s->avctx->framerate.den,
ff_mpeg12_frame_rate_tab[s1->frame_rate_index].num * s1->frame_rate_ext.num,
ff_mpeg12_frame_rate_tab[s1->frame_rate_index].den * s1->frame_rate_ext.den,
1 << 30);
#if FF_API_TICKS_PER_FRAME
FF_DISABLE_DEPRECATION_WARNINGS
avctx->ticks_per_frame = 2;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
switch (s->chroma_format) {
case 1: avctx->chroma_sample_location = AVCHROMA_LOC_LEFT; break;
case 2:
case 3: avctx->chroma_sample_location = AVCHROMA_LOC_TOPLEFT; break;
default: av_assert0(0);
}
} // MPEG-2
avctx->pix_fmt = mpeg_get_pixelformat(avctx);
if ((ret = ff_mpv_common_init(s)) < 0)
return ret;
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, ret;
ret = init_get_bits8(&s->gb, buf, buf_size);
if (ret < 0)
return ret;
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);
s->vbv_delay = vbv_delay;
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|AV_EF_COMPLIANT)))
return AVERROR_INVALIDDATA;
f_code += !f_code;
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|AV_EF_COMPLIANT)))
return AVERROR_INVALIDDATA;
f_code += !f_code;
s->mpeg_f_code[1][0] = f_code;
s->mpeg_f_code[1][1] = f_code;
}
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 */
if (!s->chroma_format) {
s->chroma_format = 1;
av_log(s->avctx, AV_LOG_WARNING, "Chroma format invalid\n");
}
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); /* XXX: handle it */
s->bit_rate += (bit_rate_ext << 18) * 400LL;
check_marker(s->avctx, &s->gb, "after bit rate extension");
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 ps: %d cf:%d vbv buffer: %d, bitrate:%"PRId64"\n",
s->avctx->profile, s->avctx->level, s->progressive_sequence, s->chroma_format,
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_DEBUG, "intra matrix specifies invalid DC quantizer %d, ignoring\n", v);
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 int 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);
s->mpeg_f_code[0][0] += !s->mpeg_f_code[0][0];
s->mpeg_f_code[0][1] += !s->mpeg_f_code[0][1];
s->mpeg_f_code[1][0] += !s->mpeg_f_code[1][0];
s->mpeg_f_code[1][1] += !s->mpeg_f_code[1][1];
if (!s->pict_type && s1->mpeg_enc_ctx_allocated) {
av_log(s->avctx, AV_LOG_ERROR, "Missing picture start code\n");
if (s->avctx->err_recognition & AV_EF_EXPLODE)
return AVERROR_INVALIDDATA;
av_log(s->avctx, AV_LOG_WARNING, "Guessing pict_type from mpeg_f_code\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->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->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);
return 0;
}
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 (!(avctx->flags2 & AV_CODEC_FLAG2_CHUNKS)) {
if (s->mb_width * s->mb_height * 11LL / (33 * 2 * 8) > buf_size)
return AVERROR_INVALIDDATA;
}
/* 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;
}
}
ret = ff_frame_new_side_data(s->avctx, s->current_picture_ptr->f,
AV_FRAME_DATA_PANSCAN, sizeof(s1->pan_scan),
&pan_scan);
if (ret < 0)
return ret;
if (pan_scan)
memcpy(pan_scan->data, &s1->pan_scan, sizeof(s1->pan_scan));
if (s1->a53_buf_ref) {
ret = ff_frame_new_side_data_from_buf(
s->avctx, s->current_picture_ptr->f, AV_FRAME_DATA_A53_CC,
&s1->a53_buf_ref, NULL);
if (ret < 0)
return ret;
}
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;
ret = ff_frame_new_side_data(s->avctx, s->current_picture_ptr->f,
AV_FRAME_DATA_AFD, 1, &sd);
if (ret < 0)
return ret;
if (sd)
*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) {
if ((ret = FF_HW_SIMPLE_CALL(s->avctx, end_frame)) < 0) {
av_log(avctx, AV_LOG_ERROR,
"hardware accelerator failed to decode first field\n");
return ret;
}
}
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 = FF_HW_CALL(avctx, start_frame, 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 lowres = s->avctx->lowres;
const int field_pic = s->picture_structure != PICT_FRAME;
int ret;
s->resync_mb_x =
s->resync_mb_y = -1;
av_assert0(mb_y < s->mb_height);
ret = init_get_bits8(&s->gb, *buf, buf_size);
if (ret < 0)
return ret;
if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
skip_bits(&s->gb, 3);
ff_mpeg1_clean_buffers(s);
s->interlaced_dct = 0;
s->qscale = mpeg_get_qscale(s);
if (s->qscale == 0) {
av_log(s->avctx, AV_LOG_ERROR, "qscale == 0\n");
return AVERROR_INVALIDDATA;
}
/* extra slice info */
if (skip_1stop_8data_bits(&s->gb) < 0)
return AVERROR_INVALIDDATA;
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,
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 (FF_HW_CALL(avctx, decode_slice, 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 %c %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]) {
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];
av_assert2(s->field_select[dir][i] == 0 ||
s->field_select[dir][i] == 1);
}
xy += wrap;
b8_xy += 2;
}
}
s->dest[0] += 16 >> lowres;
s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
ff_mpv_reconstruct_mb(s, s->block);
if (++s->mb_x >= s->mb_width) {
const int mb_size = 16 >> s->avctx->lowres;
int left;
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 >= 32 && !is_d10) {
GetBitContext gb = s->gb;
align_get_bits(&gb);
if (show_bits(&gb, 24) == 0x060E2B) {
av_log(avctx, AV_LOG_DEBUG, "Invalid MXF data found in video stream\n");
is_d10 = 1;
}
if (left > 32 && show_bits_long(&gb, 32) == 0x201) {
av_log(avctx, AV_LOG_DEBUG, "skipping m704 alpha (unsupported)\n");
goto eos;
}
}
if (left < 0 ||
(left && show_bits(&s->gb, FFMIN(left, 23)) && !is_d10) ||
((avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE)) && left > 8)) {
av_log(avctx, AV_LOG_ERROR, "end mismatch left=%d %0X at %d %d\n",
left, left>0 ? show_bits(&s->gb, FFMIN(left, 23)) : 0, s->mb_x, s->mb_y);
return AVERROR_INVALIDDATA;
} else
goto eos;
}
// There are some files out there which are missing the last slice
// in cases where the slice is completely outside the visible
// area, we detect this here instead of running into the end expecting
// more data
left = get_bits_left(&s->gb);
if (s->mb_y >= ((s->height + 15) >> 4) &&
!s->progressive_sequence &&
left <= 25 &&
left >= 0 &&
s->mb_skip_run == -1 &&
(!left || show_bits(&s->gb, left) == 0))
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,
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];
s->field_select[0][0] = (s->picture_structure - 1) & 1;
s->field_select[1][0] = (s->picture_structure - 1) & 1;
}
}
}
}
eos: // end of slice
if (get_bits_left(&s->gb) < 0) {
av_log(s, AV_LOG_ERROR, "overread %d\n", -get_bits_left(&s->gb));
return AVERROR_INVALIDDATA;
}
*buf += (get_bits_count(&s->gb) - 1) / 8;
ff_dlog(s, "Slice start:%d %d end:%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);
if (start_code < SLICE_MIN_START_CODE || start_code > SLICE_MAX_START_CODE)
return AVERROR_INVALIDDATA;
mb_y = start_code - SLICE_MIN_START_CODE;
if (s->codec_id != AV_CODEC_ID_MPEG1VIDEO && s->mb_height > 2800/16)
mb_y += (*buf&0xE0)<<2;
mb_y <<= field_pic;
if (s->picture_structure == PICT_BOTTOM_FIELD)
mb_y++;
if (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) {
int ret = FF_HW_SIMPLE_CALL(s->avctx, end_frame);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR,
"hardware accelerator failed to decode picture\n");
return ret;
}
}
/* end of slice reached */
if (/* s->mb_y << field_pic == s->mb_height && */ !s->first_field && !s1->first_slice) {
/* end of image */
ff_er_frame_end(&s->er, NULL);
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, pict);
ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_MPV_QSCALE_TYPE_MPEG2);
} else {
/* latency of 1 frame for I- and P-frames */
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, pict);
ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_MPV_QSCALE_TYPE_MPEG2);
}
}
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;
int ret = init_get_bits8(&s->gb, buf, buf_size);
if (ret < 0)
return ret;
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 | AV_EF_COMPLIANT))
return AVERROR_INVALIDDATA;
}
s1->aspect_ratio_info = get_bits(&s->gb, 4);
if (s1->aspect_ratio_info == 0) {
av_log(avctx, AV_LOG_ERROR, "aspect ratio has forbidden 0 value\n");
if (avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_COMPLIANT))
return AVERROR_INVALIDDATA;
}
s1->frame_rate_index = get_bits(&s->gb, 4);
if (s1->frame_rate_index == 0 || s1->frame_rate_index > 13) {
av_log(avctx, AV_LOG_WARNING,
"frame_rate_index %d is invalid\n", s1->frame_rate_index);
s1->frame_rate_index = 1;
}
s->bit_rate = get_bits(&s->gb, 18) * 400LL;
if (check_marker(s->avctx, &s->gb, "in sequence header") == 0) {
return AVERROR_INVALIDDATA;
}
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;
}
s->width = width;
s->height = height;
/* 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->first_field = 0;
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:%"PRId64", aspect_ratio_info: %d \n",
s->avctx->rc_buffer_size, s->bit_rate, s1->aspect_ratio_info);
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);
s1->mpeg_enc_ctx_allocated = 0;
}
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 ((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->first_field = 0;
s->frame_pred_frame_dct = 1;
s->chroma_format = 1;
if (s->codec_tag == AV_RL32("BW10")) {
s->codec_id = s->avctx->codec_id = AV_CODEC_ID_MPEG1VIDEO;
} else {
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 void mpeg_set_cc_format(AVCodecContext *avctx, enum Mpeg2ClosedCaptionsFormat format,
const char *label)
{
Mpeg1Context *s1 = avctx->priv_data;
av_assert2(format != CC_FORMAT_AUTO);
if (!s1->cc_format) {
s1->cc_format = format;
av_log(avctx, AV_LOG_DEBUG, "CC: first seen substream is %s format\n", label);
}
}
static int mpeg_decode_a53_cc(AVCodecContext *avctx,
const uint8_t *p, int buf_size)
{
Mpeg1Context *s1 = avctx->priv_data;
if ((!s1->cc_format || s1->cc_format == CC_FORMAT_A53_PART4) &&
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) {
int old_size = s1->a53_buf_ref ? s1->a53_buf_ref->size : 0;
const uint64_t new_size = (old_size + cc_count
* UINT64_C(3));
int ret;
if (new_size > 3*A53_MAX_CC_COUNT)
return AVERROR(EINVAL);
ret = av_buffer_realloc(&s1->a53_buf_ref, new_size);
if (ret >= 0)
memcpy(s1->a53_buf_ref->data + old_size, p + 7, cc_count * UINT64_C(3));
avctx->properties |= FF_CODEC_PROPERTY_CLOSED_CAPTIONS;
mpeg_set_cc_format(avctx, CC_FORMAT_A53_PART4, "A/53 Part 4");
}
return 1;
} else if ((!s1->cc_format || s1->cc_format == CC_FORMAT_SCTE20) &&
buf_size >= 2 &&
p[0] == 0x03 && (p[1]&0x7f) == 0x01) {
/* extract SCTE-20 CC data */
GetBitContext gb;
int cc_count = 0;
int i, ret;
ret = init_get_bits8(&gb, p + 2, buf_size - 2);
if (ret < 0)
return ret;
cc_count = get_bits(&gb, 5);
if (cc_count > 0) {
int old_size = s1->a53_buf_ref ? s1->a53_buf_ref->size : 0;
const uint64_t new_size = (old_size + cc_count
* UINT64_C(3));
if (new_size > 3*A53_MAX_CC_COUNT)
return AVERROR(EINVAL);
ret = av_buffer_realloc(&s1->a53_buf_ref, new_size);
if (ret >= 0) {
uint8_t field, cc1, cc2;
uint8_t *cap = s1->a53_buf_ref->data;
memset(s1->a53_buf_ref->data + old_size, 0, cc_count * 3);
for (i = 0; i < cc_count && get_bits_left(&gb) >= 26; i++) {
skip_bits(&gb, 2); // priority
field = get_bits(&gb, 2);
skip_bits(&gb, 5); // line_offset
cc1 = get_bits(&gb, 8);
cc2 = get_bits(&gb, 8);
skip_bits(&gb, 1); // marker
if (!field) { // forbidden
cap[0] = cap[1] = cap[2] = 0x00;
} else {
field = (field == 2 ? 1 : 0);
if (!s1->mpeg_enc_ctx.top_field_first) field = !field;
cap[0] = 0x04 | field;
cap[1] = ff_reverse[cc1];
cap[2] = ff_reverse[cc2];
}
cap += 3;
}
}
avctx->properties |= FF_CODEC_PROPERTY_CLOSED_CAPTIONS;
mpeg_set_cc_format(avctx, CC_FORMAT_SCTE20, "SCTE-20");
}
return 1;
} else if ((!s1->cc_format || s1->cc_format == CC_FORMAT_DVD) &&
buf_size >= 11 &&
p[0] == 'C' && p[1] == 'C' && p[2] == 0x01 && p[3] == 0xf8) {
/* extract DVD CC data
*
* uint32_t user_data_start_code 0x000001B2 (big endian)
* uint16_t user_identifier 0x4343 "CC"
* uint8_t user_data_type_code 0x01
* uint8_t caption_block_size 0xF8
* uint8_t
* bit 7 caption_odd_field_first 1=odd field (CC1/CC2) first 0=even field (CC3/CC4) first
* bit 6 caption_filler 0
* bit 5:1 caption_block_count number of caption blocks (pairs of caption words = frames). Most DVDs use 15 per start of GOP.
* bit 0 caption_extra_field_added 1=one additional caption word
*
* struct caption_field_block {
* uint8_t
* bit 7:1 caption_filler 0x7F (all 1s)
* bit 0 caption_field_odd 1=odd field (this is CC1/CC2) 0=even field (this is CC3/CC4)
* uint8_t caption_first_byte
* uint8_t caption_second_byte
* } caption_block[(caption_block_count * 2) + caption_extra_field_added];
*
* Some DVDs encode caption data for both fields with caption_field_odd=1. The only way to decode the fields
* correctly is to start on the field indicated by caption_odd_field_first and count between odd/even fields.
* Don't assume that the first caption word is the odd field. There do exist MPEG files in the wild that start
* on the even field. There also exist DVDs in the wild that encode an odd field count and the
* caption_extra_field_added/caption_odd_field_first bits change per packet to allow that. */
int cc_count = 0;
int i, ret;
// 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) {
int old_size = s1->a53_buf_ref ? s1->a53_buf_ref->size : 0;
const uint64_t new_size = (old_size + cc_count
* UINT64_C(6));
if (new_size > 3*A53_MAX_CC_COUNT)
return AVERROR(EINVAL);
ret = av_buffer_realloc(&s1->a53_buf_ref, new_size);
if (ret >= 0) {
uint8_t field1 = !!(p[4] & 0x80);
uint8_t *cap = s1->a53_buf_ref->data;
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;
}
}
avctx->properties |= FF_CODEC_PROPERTY_CLOSED_CAPTIONS;
mpeg_set_cc_format(avctx, CC_FORMAT_DVD, "DVD");
}
return 1;
}
return 0;
}
static void mpeg_decode_user_data(AVCodecContext *avctx,
const uint8_t *p, int buf_size)
{
Mpeg1Context *s = avctx->priv_data;
const uint8_t *buf_end = p + buf_size;
Mpeg1Context *s1 = avctx->priv_data;
#if 0
int i;
for(i=0; !(!p[i-2] && !p[i-1] && p[i]==1) && i<buf_size; i++){
av_log(avctx, AV_LOG_ERROR, "%c", p[i]);
}
av_log(avctx, AV_LOG_ERROR, "\n");
#endif
if (buf_size > 29){
int i;
for(i=0; i<20; i++)
if (!memcmp(p+i, "\0TMPGEXS\0", 9)){
s->tmpgexs= 1;
}
}
/* 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 int mpeg_decode_gop(AVCodecContext *avctx,
const uint8_t *buf, int buf_size)
{
Mpeg1Context *s1 = avctx->priv_data;
MpegEncContext *s = &s1->mpeg_enc_ctx;
int broken_link;
int64_t tc;
int ret = init_get_bits8(&s->gb, buf, buf_size);
if (ret < 0)
return ret;
tc = s1->timecode_frame_start = get_bits(&s->gb, 25);
s1->closed_gop = get_bits1(&s->gb);
/* broken_link indicates 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) {
char tcbuf[AV_TIMECODE_STR_SIZE];
av_timecode_make_mpeg_tc_string(tcbuf, tc);
av_log(s->avctx, AV_LOG_DEBUG,
"GOP (%s) closed_gop=%d broken_link=%d\n",
tcbuf, s1->closed_gop, broken_link);
}
return 0;
}
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;
int picture_start_code_seen = 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;
av_assert0(avctx->thread_count > 1);
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 || s2->pict_type == AV_PICTURE_TYPE_B)
*got_output = 1;
}
}
s2->pict_type = 0;
if (avctx->err_recognition & AV_EF_EXPLODE && s2->er.error_count)
return AVERROR_INVALIDDATA;
return FFMAX(0, buf_ptr - buf);
}
input_size = buf_end - buf_ptr;
if (avctx->debug & FF_DEBUG_STARTCODE)
av_log(avctx, AV_LOG_DEBUG, "%3"PRIX32" at %"PTRDIFF_SPECIFIER" 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);
if (buf != avctx->extradata)
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 (picture_start_code_seen && s2->picture_structure == PICT_FRAME) {
/* If it's a frame picture, there can't be more than one picture header.
Yet, it does happen and we need to handle it. */
av_log(avctx, AV_LOG_WARNING, "ignoring extra picture following a frame-picture\n");
break;
}
picture_start_code_seen = 1;
if (buf == avctx->extradata && avctx->codec_tag == AV_RL32("AVmp")) {
av_log(avctx, AV_LOG_WARNING, "ignoring picture start code in AVmp extradata\n");
break;
}
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 (s->tmpgexs){
s2->intra_dc_precision= 3;
s2->intra_matrix[0]= 1;
}
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:
ret = init_get_bits8(&s2->gb, buf_ptr, input_size);
if (ret < 0)
return ret;
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) {
int ret = mpeg_decode_picture_coding_extension(s);
if (ret < 0)
return ret;
} 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;
ret = mpeg_decode_gop(avctx, buf_ptr, input_size);
if (ret < 0)
return ret;
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 == PICTURE_START_CODE) {
if (s2->progressive_sequence && !s2->progressive_frame) {
s2->progressive_frame = 1;
av_log(s2->avctx, AV_LOG_ERROR,
"interlaced frame in progressive sequence, ignoring\n");
}
if (s2->picture_structure == 0 ||
(s2->progressive_frame && s2->picture_structure != PICT_FRAME)) {
av_log(s2->avctx, AV_LOG_ERROR,
"picture_structure %d invalid, ignoring\n",
s2->picture_structure);
s2->picture_structure = PICT_FRAME;
}
if (s2->progressive_sequence && !s2->frame_pred_frame_dct)
av_log(s2->avctx, AV_LOG_WARNING, "invalid frame_pred_frame_dct\n");
if (s2->picture_structure == PICT_FRAME) {
s2->first_field = 0;
s2->v_edge_pos = 16 * s2->mb_height;
} else {
s2->first_field ^= 1;
s2->v_edge_pos = 8 * s2->mb_height;
memset(s2->mbskip_table, 0, s2->mb_stride * s2->mb_height);
}
}
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;
last_code = SLICE_MIN_START_CODE;
if (s2->codec_id != AV_CODEC_ID_MPEG1VIDEO && s2->mb_height > 2800/16)
mb_y += (*buf_ptr&0xE0)<<2;
mb_y <<= field_pic;
if (s2->picture_structure == PICT_BOTTOM_FIELD)
mb_y++;
if (buf_end - buf_ptr < 2) {
av_log(s2->avctx, AV_LOG_ERROR, "slice too small\n");
return AVERROR_INVALIDDATA;
}
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;
av_log(s2->avctx, AV_LOG_DEBUG,
"Skipping B slice due to open GOP\n");
break;
}
}
}
if (s2->pict_type == AV_PICTURE_TYPE_I || (s2->avctx->flags2 & AV_CODEC_FLAG2_SHOW_ALL))
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;
av_log(s2->avctx, AV_LOG_DEBUG,
"Skipping P slice due to !sync\n");
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;
av_assert0(avctx->thread_count > 1);
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;
}
ret = init_get_bits8(&thread_context->gb, buf_ptr, input_size);
if (ret < 0)
return ret;
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, AVFrame *picture,
int *got_output, AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int ret;
int buf_size = avpkt->size;
Mpeg1Context *s = avctx->priv_data;
MpegEncContext *s2 = &s->mpeg_enc_ctx;
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 (s->mpeg_enc_ctx_allocated == 0 && ( s2->codec_tag == AV_RL32("VCR2")
|| s2->codec_tag == AV_RL32("BW10")
))
vcr2_init_sequence(avctx);
s->slice_count = 0;
if (avctx->extradata && !s->extradata_decoded) {
ret = decode_chunks(avctx, picture, got_output,
avctx->extradata, avctx->extradata_size);
if (*got_output) {
av_log(avctx, AV_LOG_ERROR, "picture in extradata\n");
av_frame_unref(picture);
*got_output = 0;
}
s->extradata_decoded = 1;
if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE)) {
s2->current_picture_ptr = NULL;
return ret;
}
}
ret = decode_chunks(avctx, picture, got_output, buf, buf_size);
if (ret<0 || *got_output) {
s2->current_picture_ptr = NULL;
if (s->timecode_frame_start != -1 && *got_output) {
char tcbuf[AV_TIMECODE_STR_SIZE];
AVFrameSideData *tcside = av_frame_new_side_data(picture,
AV_FRAME_DATA_GOP_TIMECODE,
sizeof(int64_t));
if (!tcside)
return AVERROR(ENOMEM);
memcpy(tcside->data, &s->timecode_frame_start, sizeof(int64_t));
av_timecode_make_mpeg_tc_string(tcbuf, s->timecode_frame_start);
av_dict_set(&picture->metadata, "timecode", tcbuf, 0);
s->timecode_frame_start = -1;
}
}
return ret;
}
static void flush(AVCodecContext *avctx)
{
Mpeg1Context *s = avctx->priv_data;
s->sync = 0;
s->closed_gop = 0;
av_buffer_unref(&s->a53_buf_ref);
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_buffer_unref(&s->a53_buf_ref);
return 0;
}
const FFCodec ff_mpeg1video_decoder = {
.p.name = "mpeg1video",
CODEC_LONG_NAME("MPEG-1 video"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_MPEG1VIDEO,
.priv_data_size = sizeof(Mpeg1Context),
.init = mpeg_decode_init,
.close = mpeg_decode_end,
FF_CODEC_DECODE_CB(mpeg_decode_frame),
.p.capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
AV_CODEC_CAP_DELAY | AV_CODEC_CAP_SLICE_THREADS,
.caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
.flush = flush,
.p.max_lowres = 3,
UPDATE_THREAD_CONTEXT(mpeg_decode_update_thread_context),
.hw_configs = (const AVCodecHWConfigInternal *const []) {
#if CONFIG_MPEG1_NVDEC_HWACCEL
HWACCEL_NVDEC(mpeg1),
#endif
#if CONFIG_MPEG1_VDPAU_HWACCEL
HWACCEL_VDPAU(mpeg1),
#endif
#if CONFIG_MPEG1_VIDEOTOOLBOX_HWACCEL
HWACCEL_VIDEOTOOLBOX(mpeg1),
#endif
NULL
},
};
#define M2V_OFFSET(x) offsetof(Mpeg1Context, x)
#define M2V_PARAM AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
static const AVOption mpeg2video_options[] = {
{ "cc_format", "extract a specific Closed Captions format",
M2V_OFFSET(cc_format), AV_OPT_TYPE_INT, { .i64 = CC_FORMAT_AUTO },
CC_FORMAT_AUTO, CC_FORMAT_DVD, M2V_PARAM, .unit = "cc_format" },
{ "auto", "pick first seen CC substream", 0, AV_OPT_TYPE_CONST,
{ .i64 = CC_FORMAT_AUTO }, .flags = M2V_PARAM, .unit = "cc_format" },
{ "a53", "pick A/53 Part 4 CC substream", 0, AV_OPT_TYPE_CONST,
{ .i64 = CC_FORMAT_A53_PART4 }, .flags = M2V_PARAM, .unit = "cc_format" },
{ "scte20", "pick SCTE-20 CC substream", 0, AV_OPT_TYPE_CONST,
{ .i64 = CC_FORMAT_SCTE20 }, .flags = M2V_PARAM, .unit = "cc_format" },
{ "dvd", "pick DVD CC substream", 0, AV_OPT_TYPE_CONST,
{ .i64 = CC_FORMAT_DVD }, .flags = M2V_PARAM, .unit = "cc_format" },
{ NULL }
};
static const AVClass mpeg2video_class = {
.class_name = "MPEG-2 video",
.item_name = av_default_item_name,
.option = mpeg2video_options,
.version = LIBAVUTIL_VERSION_INT,
.category = AV_CLASS_CATEGORY_DECODER,
};
const FFCodec ff_mpeg2video_decoder = {
.p.name = "mpeg2video",
CODEC_LONG_NAME("MPEG-2 video"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_MPEG2VIDEO,
.p.priv_class = &mpeg2video_class,
.priv_data_size = sizeof(Mpeg1Context),
.init = mpeg_decode_init,
.close = mpeg_decode_end,
FF_CODEC_DECODE_CB(mpeg_decode_frame),
.p.capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
AV_CODEC_CAP_DELAY | AV_CODEC_CAP_SLICE_THREADS,
.caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
.flush = flush,
.p.max_lowres = 3,
.p.profiles = NULL_IF_CONFIG_SMALL(ff_mpeg2_video_profiles),
.hw_configs = (const AVCodecHWConfigInternal *const []) {
#if CONFIG_MPEG2_DXVA2_HWACCEL
HWACCEL_DXVA2(mpeg2),
#endif
#if CONFIG_MPEG2_D3D11VA_HWACCEL
HWACCEL_D3D11VA(mpeg2),
#endif
#if CONFIG_MPEG2_D3D11VA2_HWACCEL
HWACCEL_D3D11VA2(mpeg2),
#endif
#if CONFIG_MPEG2_D3D12VA_HWACCEL
HWACCEL_D3D12VA(mpeg2),
#endif
#if CONFIG_MPEG2_NVDEC_HWACCEL
HWACCEL_NVDEC(mpeg2),
#endif
#if CONFIG_MPEG2_VAAPI_HWACCEL
HWACCEL_VAAPI(mpeg2),
#endif
#if CONFIG_MPEG2_VDPAU_HWACCEL
HWACCEL_VDPAU(mpeg2),
#endif
#if CONFIG_MPEG2_VIDEOTOOLBOX_HWACCEL
HWACCEL_VIDEOTOOLBOX(mpeg2),
#endif
NULL
},
};
//legacy decoder
const FFCodec ff_mpegvideo_decoder = {
.p.name = "mpegvideo",
CODEC_LONG_NAME("MPEG-1 video"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_MPEG2VIDEO,
.priv_data_size = sizeof(Mpeg1Context),
.init = mpeg_decode_init,
.close = mpeg_decode_end,
FF_CODEC_DECODE_CB(mpeg_decode_frame),
.p.capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
AV_CODEC_CAP_DELAY | AV_CODEC_CAP_SLICE_THREADS,
.caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
.flush = flush,
.p.max_lowres = 3,
};
typedef struct IPUContext {
MpegEncContext m;
int flags;
DECLARE_ALIGNED(32, int16_t, block)[6][64];
} IPUContext;
static int ipu_decode_frame(AVCodecContext *avctx, AVFrame *frame,
int *got_frame, AVPacket *avpkt)
{
IPUContext *s = avctx->priv_data;
MpegEncContext *m = &s->m;
GetBitContext *gb = &m->gb;
int ret;
// Check for minimal intra MB size (considering mb header, luma & chroma dc VLC, ac EOB VLC)
if (avpkt->size*8LL < (avctx->width+15)/16 * ((avctx->height+15)/16) * (2 + 3*4 + 2*2 + 2*6))
return AVERROR_INVALIDDATA;
ret = ff_get_buffer(avctx, frame, 0);
if (ret < 0)
return ret;
ret = init_get_bits8(gb, avpkt->data, avpkt->size);
if (ret < 0)
return ret;
s->flags = get_bits(gb, 8);
m->intra_dc_precision = s->flags & 3;
m->q_scale_type = !!(s->flags & 0x40);
m->intra_vlc_format = !!(s->flags & 0x20);
m->alternate_scan = !!(s->flags & 0x10);
if (s->flags & 0x10) {
ff_init_scantable(m->idsp.idct_permutation, &m->inter_scantable, ff_alternate_vertical_scan);
ff_init_scantable(m->idsp.idct_permutation, &m->intra_scantable, ff_alternate_vertical_scan);
} else {
ff_init_scantable(m->idsp.idct_permutation, &m->inter_scantable, ff_zigzag_direct);
ff_init_scantable(m->idsp.idct_permutation, &m->intra_scantable, ff_zigzag_direct);
}
m->last_dc[0] = m->last_dc[1] = m->last_dc[2] = 1 << (7 + (s->flags & 3));
m->qscale = 1;
for (int y = 0; y < avctx->height; y += 16) {
int intraquant;
for (int x = 0; x < avctx->width; x += 16) {
if (x || y) {
if (!get_bits1(gb))
return AVERROR_INVALIDDATA;
}
if (get_bits1(gb)) {
intraquant = 0;
} else {
if (!get_bits1(gb))
return AVERROR_INVALIDDATA;
intraquant = 1;
}
if (s->flags & 4)
skip_bits1(gb);
if (intraquant)
m->qscale = mpeg_get_qscale(m);
memset(s->block, 0, sizeof(s->block));
for (int n = 0; n < 6; n++) {
if (s->flags & 0x80) {
ret = ff_mpeg1_decode_block_intra(&m->gb,
m->intra_matrix,
m->intra_scantable.permutated,
m->last_dc, s->block[n],
n, m->qscale);
if (ret >= 0)
m->block_last_index[n] = ret;
} else {
ret = mpeg2_decode_block_intra(m, s->block[n], n);
}
if (ret < 0)
return ret;
}
m->idsp.idct_put(frame->data[0] + y * frame->linesize[0] + x,
frame->linesize[0], s->block[0]);
m->idsp.idct_put(frame->data[0] + y * frame->linesize[0] + x + 8,
frame->linesize[0], s->block[1]);
m->idsp.idct_put(frame->data[0] + (y + 8) * frame->linesize[0] + x,
frame->linesize[0], s->block[2]);
m->idsp.idct_put(frame->data[0] + (y + 8) * frame->linesize[0] + x + 8,
frame->linesize[0], s->block[3]);
m->idsp.idct_put(frame->data[1] + (y >> 1) * frame->linesize[1] + (x >> 1),
frame->linesize[1], s->block[4]);
m->idsp.idct_put(frame->data[2] + (y >> 1) * frame->linesize[2] + (x >> 1),
frame->linesize[2], s->block[5]);
}
}
align_get_bits(gb);
if (get_bits_left(gb) != 32)
return AVERROR_INVALIDDATA;
frame->pict_type = AV_PICTURE_TYPE_I;
frame->flags |= AV_FRAME_FLAG_KEY;
*got_frame = 1;
return avpkt->size;
}
static av_cold int ipu_decode_init(AVCodecContext *avctx)
{
IPUContext *s = avctx->priv_data;
MpegEncContext *m = &s->m;
avctx->pix_fmt = AV_PIX_FMT_YUV420P;
ff_mpv_decode_init(m, avctx);
ff_mpeg12_init_vlcs();
for (int i = 0; i < 64; i++) {
int j = m->idsp.idct_permutation[i];
int v = ff_mpeg1_default_intra_matrix[i];
m->intra_matrix[j] = v;
m->chroma_intra_matrix[j] = v;
}
for (int i = 0; i < 64; i++) {
int j = m->idsp.idct_permutation[i];
int v = ff_mpeg1_default_non_intra_matrix[i];
m->inter_matrix[j] = v;
m->chroma_inter_matrix[j] = v;
}
return 0;
}
static av_cold int ipu_decode_end(AVCodecContext *avctx)
{
IPUContext *s = avctx->priv_data;
ff_mpv_common_end(&s->m);
return 0;
}
const FFCodec ff_ipu_decoder = {
.p.name = "ipu",
CODEC_LONG_NAME("IPU Video"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_IPU,
.priv_data_size = sizeof(IPUContext),
.init = ipu_decode_init,
FF_CODEC_DECODE_CB(ipu_decode_frame),
.close = ipu_decode_end,
.p.capabilities = AV_CODEC_CAP_DR1,
.caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
};
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