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19e30a58fc
ffmpeg/libavcodec/mpeg12dec.c
Diego Biurrun 19e30a58fc Deprecate obsolete XvMC hardware decoding support 
XvMC has long ago been superseded by newer acceleration APIs, such as
VDPAU, and few downstreams still support it. Furthermore XvMC is not
implemented within the hwaccel framework, but requires its own specific
code in the MPEG-1/2 decoder, which is a maintenance burden.
2013-11-13 21:07:45 +01:00

2507 lines
90 KiB
C
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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 "libavutil/attributes.h"
#include "libavutil/internal.h"
#include "internal.h"
#include "avcodec.h"
#include "dsputil.h"
#include "mpegvideo.h"
#include "error_resilience.h"
#include "mpeg12.h"
#include "mpeg12data.h"
#include "bytestream.h"
#include "xvmc_internal.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 */
int slice_count;
int swap_uv;//indicate VCR2
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 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);
}
static inline int mpeg1_decode_block_intra(MpegEncContext *s, int16_t *block, int n)
{
int level, dc, diff, i, j, run;
int component;
RLTable *rl = &ff_rl_mpeg1;
uint8_t * const scantable = s->intra_scantable.permutated;
const uint16_t *quant_matrix = s->intra_matrix;
const int qscale = s->qscale;
/* DC coefficient */
component = (n <= 3 ? 0 : n - 4 + 1);
diff = decode_dc(&s->gb, component);
if (diff >= 0xffff)
return -1;
dc = s->last_dc[component];
dc += diff;
s->last_dc[component] = dc;
block[0] = dc * quant_matrix[0];
av_dlog(s->avctx, "dc=%d diff=%d\n", dc, diff);
i = 0;
{
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;
j = scantable[i];
level = (level * qscale * quant_matrix[j]) >> 4;
level = (level - 1) | 1;
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, 8); SKIP_BITS(re, &s->gb, 8);
if (level == -128) {
level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
} else if (level == 0) {
level = SHOW_UBITS(re, &s->gb, 8) ; LAST_SKIP_BITS(re, &s->gb, 8);
}
i += run;
j = scantable[i];
if (level < 0) {
level = -level;
level = (level * qscale * quant_matrix[j]) >> 4;
level = (level - 1) | 1;
level = -level;
} else {
level = (level * qscale * quant_matrix[j]) >> 4;
level = (level - 1) | 1;
}
}
if (i > 63) {
av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
return -1;
}
block[j] = level;
}
CLOSE_READER(re, &s->gb);
}
s->block_last_index[n] = i;
return 0;
}
int ff_mpeg1_decode_block_intra(MpegEncContext *s, int16_t *block, int n)
{
return mpeg1_decode_block_intra(s, block, n);
}
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;
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;
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;
}
}
if (i > 63) {
av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
return -1;
}
block[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);
}
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;
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;
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);
}
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;
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;
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;
}
}
if (i > 63) {
av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
return -1;
}
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);
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;
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;
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);
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 -1;
dc = s->last_dc[component];
dc += diff;
s->last_dc[component] = dc;
block[0] = dc << (3 - s->intra_dc_precision);
av_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;
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;
j = scantable[i];
if (level < 0) {
level = (-level * qscale * quant_matrix[j]) >> 4;
level = -level;
} else {
level = (level * qscale * quant_matrix[j]) >> 4;
}
}
if (i > 63) {
av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
return -1;
}
mismatch ^= level;
block[j] = level;
}
CLOSE_READER(re, &s->gb);
}
block[63] ^= mismatch & 1;
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, j, run;
int component;
RLTable *rl;
uint8_t * 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 -1;
dc = s->last_dc[component];
dc += diff;
s->last_dc[component] = dc;
block[0] = dc << (3 - s->intra_dc_precision);
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) {
scantable += run;
j = *scantable;
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);
scantable += run;
j = *scantable;
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);
}
s->block_last_index[n] = scantable - s->intra_scantable.permutated;
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;
}
}
static void exchange_uv(MpegEncContext *s)
{
int16_t (*tmp)[64];
tmp = s->pblocks[4];
s->pblocks[4] = s->pblocks[5];
s->pblocks[5] = tmp;
}
/* 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);
av_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
mb_type = s->current_picture.mb_type[s->mb_width + (s->mb_y - 1) * s->mb_stride - 1]; // FIXME not sure if this is allowed in MPEG at all
if (IS_INTRA(mb_type))
return -1;
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 -1;
}
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 -1;
}
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 -1;
}
mb_type = btype2mb_type[mb_type];
break;
}
av_dlog(s->avctx, "mb_type=%x\n", mb_type);
// motion_type = 0; /* avoid warning */
if (IS_INTRA(mb_type)) {
s->dsp.clear_blocks(s->block[0]);
if (!s->chroma_y_shift) {
s->dsp.clear_blocks(s->block[6]);
}
/* compute DCT type */
if (s->picture_structure == PICT_FRAME && // FIXME add an interlaced_dct coded var?
!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
memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */
s->mb_intra = 1;
#if FF_API_XVMC
FF_DISABLE_DEPRECATION_WARNINGS
// if 1, we memcpy blocks in xvmcvideo
if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1) {
ff_xvmc_pack_pblocks(s, -1); // inter are always full blocks
if (s->swap_uv) {
exchange_uv(s);
}
}
FF_ENABLE_DEPRECATION_WARNINGS
#endif /* FF_API_XVMC */
if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
if (s->flags2 & 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 (mpeg2_decode_block_intra(s, *s->pblocks[i], i) < 0)
return -1;
}
}
} else {
for (i = 0; i < 6; i++) {
if (mpeg1_decode_block_intra(s, *s->pblocks[i], i) < 0)
return -1;
}
}
} 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;
av_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;
av_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;
av_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 -1;
}
}
s->mb_intra = 0;
if (HAS_CBP(mb_type)) {
s->dsp.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->dsp.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 -1;
}
#if FF_API_XVMC
FF_DISABLE_DEPRECATION_WARNINGS
//if 1, we memcpy blocks in xvmcvideo
if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1) {
ff_xvmc_pack_pblocks(s, cbp);
if (s->swap_uv) {
exchange_uv(s);
}
}
FF_ENABLE_DEPRECATION_WARNINGS
#endif /* FF_API_XVMC */
if (s->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
if (s->flags2 & 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 (mpeg2_decode_block_non_intra(s, *s->pblocks[i], i) < 0)
return -1;
} else {
s->block_last_index[i] = -1;
}
cbp += cbp;
}
}
} else {
if (s->flags2 & 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 (mpeg1_decode_block_inter(s, *s->pblocks[i], i) < 0)
return -1;
} 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;
int i;
/* we need some permutation to store matrices,
* until MPV_common_init() sets the real permutation. */
for (i = 0; i < 64; i++)
s2->dsp.idct_permutation[i]=i;
ff_MPV_decode_defaults(s2);
s->mpeg_enc_ctx.avctx = avctx;
s->mpeg_enc_ctx.flags = avctx->flags;
s->mpeg_enc_ctx.flags2 = avctx->flags2;
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)
memcpy(s + 1, s1 + 1, sizeof(Mpeg1Context) - sizeof(MpegEncContext));
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]];
}
}
#if FF_API_XVMC
static const enum AVPixelFormat pixfmt_xvmc_mpg2_420[] = {
AV_PIX_FMT_XVMC_MPEG2_IDCT,
AV_PIX_FMT_XVMC_MPEG2_MC,
AV_PIX_FMT_NONE };
#endif /* FF_API_XVMC */
static const enum AVPixelFormat mpeg12_hwaccel_pixfmt_list_420[] = {
#if CONFIG_MPEG2_DXVA2_HWACCEL
AV_PIX_FMT_DXVA2_VLD,
#endif
#if CONFIG_MPEG2_VAAPI_HWACCEL
AV_PIX_FMT_VAAPI_VLD,
#endif
#if CONFIG_MPEG1_VDPAU_HWACCEL | CONFIG_MPEG2_VDPAU_HWACCEL
AV_PIX_FMT_VDPAU,
#endif
AV_PIX_FMT_YUV420P,
AV_PIX_FMT_NONE
};
static enum AVPixelFormat mpeg_get_pixelformat(AVCodecContext *avctx)
{
Mpeg1Context *s1 = avctx->priv_data;
MpegEncContext *s = &s1->mpeg_enc_ctx;
#if FF_API_XVMC
FF_DISABLE_DEPRECATION_WARNINGS
if (avctx->xvmc_acceleration)
return avctx->get_format(avctx, pixfmt_xvmc_mpg2_420);
FF_ENABLE_DEPRECATION_WARNINGS
#endif /* FF_API_XVMC */
if (s->chroma_format < 2)
return avctx->get_format(avctx, mpeg12_hwaccel_pixfmt_list_420);
else if (s->chroma_format == 2)
return AV_PIX_FMT_YUV422P;
else
return AV_PIX_FMT_YUV444P;
}
/* 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;
}
if ((s->width == 0) || (s->height == 0))
return -2;
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->time_base.den = ff_mpeg12_frame_rate_tab[s->frame_rate_index].num;
avctx->time_base.num = ff_mpeg12_frame_rate_tab[s->frame_rate_index].den;
//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->time_base.den,
&s->avctx->time_base.num,
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});
av_dlog(avctx, "A %d/%d\n",
ff_mpeg2_aspect[s->aspect_ratio_info].num, ff_mpeg2_aspect[s->aspect_ratio_info].den);
av_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
avctx->pix_fmt = mpeg_get_pixelformat(avctx);
avctx->hwaccel = ff_find_hwaccel(avctx);
// until then pix_fmt may be changed right after codec init
#if FF_API_XVMC
if ((avctx->pix_fmt == AV_PIX_FMT_XVMC_MPEG2_IDCT ||
avctx->hwaccel) && avctx->idct_algo == FF_IDCT_AUTO)
#else
if (avctx->hwaccel && avctx->idct_algo == FF_IDCT_AUTO)
#endif /* FF_API_XVMC */
avctx->idct_algo = FF_IDCT_SIMPLE;
/* Quantization matrices may need reordering
* if DCT permutation is changed. */
memcpy(old_permutation, s->dsp.idct_permutation, 64 * sizeof(uint8_t));
if (ff_MPV_common_init(s) < 0)
return -2;
quant_matrix_rebuild(s->intra_matrix, old_permutation, s->dsp.idct_permutation);
quant_matrix_rebuild(s->inter_matrix, old_permutation, s->dsp.idct_permutation);
quant_matrix_rebuild(s->chroma_intra_matrix, old_permutation, s->dsp.idct_permutation);
quant_matrix_rebuild(s->chroma_inter_matrix, old_permutation, s->dsp.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 -1;
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 -1;
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 -1;
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); /* XXX: handle it */
s->bit_rate += (bit_rate_ext << 18) * 400;
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->flags & 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;
av_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 (%d,%d) (%d,%d) (%d,%d)\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->dsp.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 -1;
}
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)
{
av_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->first_field = 0;
s->v_edge_pos = 16 * s->mb_height;
} else {
s->first_field ^= 1;
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->dsp.idct_permutation, &s->inter_scantable, ff_alternate_vertical_scan);
ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_alternate_vertical_scan);
} else {
ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable, ff_zigzag_direct);
ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable, ff_zigzag_direct);
}
/* composite display not parsed */
av_dlog(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
av_dlog(s->avctx, "picture_structure=%d\n", s->picture_structure);
av_dlog(s->avctx, "top field first=%d\n", s->top_field_first);
av_dlog(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
av_dlog(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
av_dlog(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
av_dlog(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
av_dlog(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
av_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;
/* start frame decoding */
if (s->first_field || s->picture_structure == PICT_FRAME) {
AVFrameSideData *pan_scan;
if (ff_MPV_frame_start(s, avctx) < 0)
return -1;
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 (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 -1;
}
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 (avctx->hwaccel->start_frame(avctx, buf, buf_size) < 0)
return -1;
}
#if FF_API_XVMC
FF_DISABLE_DEPRECATION_WARNINGS
// MPV_frame_start will call this function too,
// but we need to call it on every field
if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
if (ff_xvmc_field_start(s, avctx) < 0)
return -1;
FF_ENABLE_DEPRECATION_WARNINGS
#endif /* FF_API_XVMC */
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;
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 -1;
}
/* 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 -1;
}
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 -1;
}
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 FF_API_XVMC
FF_DISABLE_DEPRECATION_WARNINGS
// If 1, we memcpy blocks in xvmcvideo.
if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1)
ff_xvmc_init_block(s); // set s->block
FF_ENABLE_DEPRECATION_WARNINGS
#endif /* FF_API_XVMC */
if (mpeg_decode_mb(s, s->block) < 0)
return -1;
if (s->current_picture.motion_val[0] && !s->encoding) { // note motion_val is normally NULL unless we want to extract the MVs
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 -1;
} 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 -1;
}
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 -1;
}
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 -1;
}
/* 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;
av_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();
av_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 -1;
}
}
/**
* 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");
}
#if FF_API_XVMC
FF_DISABLE_DEPRECATION_WARNINGS
if (CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
ff_xvmc_field_end(s);
FF_ENABLE_DEPRECATION_WARNINGS
#endif /* FF_API_XVMC */
/* 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 != NULL) {
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 -1;
}
s->frame_rate_index = get_bits(&s->gb, 4);
if (s->frame_rate_index == 0 || s->frame_rate_index > 13)
return -1;
s->bit_rate = get_bits(&s->gb, 18) * 400;
if (get_bits1(&s->gb) == 0) /* marker */
return -1;
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->dsp.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->dsp.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 -1;
}
/* 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;
s->swap_uv = 0; // AFAIK VCR2 does not have SEQ_HEADER
if (s->flags & 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;
/* 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);
avctx->hwaccel = ff_find_hwaccel(avctx);
#if FF_API_XVMC
if ((avctx->pix_fmt == AV_PIX_FMT_XVMC_MPEG2_IDCT || avctx->hwaccel) &&
avctx->idct_algo == FF_IDCT_AUTO)
#else
if (avctx->hwaccel && avctx->idct_algo == FF_IDCT_AUTO)
#endif /* FF_API_XVMC */
avctx->idct_algo = FF_IDCT_SIMPLE;
if (ff_MPV_common_init(s) < 0)
return -1;
exchange_uv(s); // common init reset pblocks, so we swap them here
s->swap_uv = 1; // in case of xvmc we need to swap uv for each MB
s1->mpeg_enc_ctx_allocated = 1;
for (i = 0; i < 64; i++) {
int j = s->dsp.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 void mpeg_decode_user_data(AVCodecContext *avctx,
const uint8_t *p, int buf_size)
{
const uint8_t *buf_end = p + buf_size;
/* 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;
avctx->dtg_active_format = p[0] & 0x0f;
}
}
}
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) {
if (s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
*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, "%3X 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;
s2->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 -1;
}
if (s2->last_picture_ptr == NULL) {
/* 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 == NULL) {
/* 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 (s2->first_slice) {
skip_frame = 0;
s2->first_slice = 0;
if (mpeg_field_start(s2, buf, buf_size) < 0)
return -1;
}
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;
av_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->flags & 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);
return 0;
}
static const AVProfile mpeg2_video_profiles[] = {
{ FF_PROFILE_MPEG2_422, "4:2:2" },
{ FF_PROFILE_MPEG2_HIGH, "High" },
{ FF_PROFILE_MPEG2_SS, "Spatially Scalable" },
{ FF_PROFILE_MPEG2_SNR_SCALABLE, "SNR Scalable" },
{ FF_PROFILE_MPEG2_MAIN, "Main" },
{ FF_PROFILE_MPEG2_SIMPLE, "Simple" },
{ FF_PROFILE_RESERVED, "Reserved" },
{ FF_PROFILE_RESERVED, "Reserved" },
{ FF_PROFILE_UNKNOWN },
};
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 = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
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 = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
CODEC_CAP_SLICE_THREADS,
.flush = flush,
.profiles = NULL_IF_CONFIG_SMALL(mpeg2_video_profiles),
};
#if FF_API_XVMC
#if CONFIG_MPEG_XVMC_DECODER
static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx)
{
if (avctx->active_thread_type & FF_THREAD_SLICE)
return -1;
if (!(avctx->slice_flags & SLICE_FLAG_CODED_ORDER))
return -1;
if (!(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD)) {
av_dlog(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
}
mpeg_decode_init(avctx);
avctx->pix_fmt = AV_PIX_FMT_XVMC_MPEG2_IDCT;
avctx->xvmc_acceleration = 2; // 2 - the blocks are packed!
return 0;
}
AVCodec ff_mpeg_xvmc_decoder = {
.name = "mpegvideo_xvmc",
.long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video XvMC (X-Video Motion Compensation)"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_MPEG2VIDEO_XVMC,
.priv_data_size = sizeof(Mpeg1Context),
.init = mpeg_mc_decode_init,
.close = mpeg_decode_end,
.decode = mpeg_decode_frame,
.capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
.flush = flush,
};
#endif
#endif /* FF_API_XVMC */
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