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a4c7a5ea27
third_party_ffmpeg/libavcodec/mpeg12.c
Michael Niedermayer a4c7a5ea27 Call ff_fetch_timestamp() for mpeg1/2 when a picture start code is found instead 
of calling it at the end of a frame with a large negative offset.
This significantly reduces the maximal distance in container packets between
the point where the first byte of the "access unit" was stored and where
we call ff_fetch_timestamp() thus reducing the constraints on our parser.
Also change the parser from next_frame_offset to cur, this is needed
because now the reference is from container packet start instead of
frame start. (i previously misinterpreted this as bug)

Originally committed as revision 17731 to svn://svn.ffmpeg.org/ffmpeg/trunk
2009-03-02 14:53:18 +00:00

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/*
* MPEG-1/2 decoder
* Copyright (c) 2000,2001 Fabrice Bellard
* Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
*
* This file is part of 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 libavcodec/mpeg12.c
* MPEG-1/2 decoder
*/
//#define DEBUG
#include "internal.h"
#include "avcodec.h"
#include "dsputil.h"
#include "mpegvideo.h"
#include "mpeg12.h"
#include "mpeg12data.h"
#include "mpeg12decdata.h"
#include "bytestream.h"
#include "vdpau_internal.h"
#include "xvmc_internal.h"
//#undef NDEBUG
//#include <assert.h>
#define MV_VLC_BITS 9
#define MBINCR_VLC_BITS 9
#define MB_PAT_VLC_BITS 9
#define MB_PTYPE_VLC_BITS 6
#define MB_BTYPE_VLC_BITS 6
static inline int mpeg1_decode_block_inter(MpegEncContext *s,
DCTELEM *block,
int n);
static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n);
static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
DCTELEM *block,
int n);
static inline int mpeg2_decode_block_intra(MpegEncContext *s,
DCTELEM *block,
int n);
static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s, DCTELEM *block, int n);
static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n);
static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred);
static void exchange_uv(MpegEncContext *s);
static const enum PixelFormat pixfmt_xvmc_mpg2_420[] = {
PIX_FMT_XVMC_MPEG2_IDCT,
PIX_FMT_XVMC_MPEG2_MC,
PIX_FMT_NONE};
uint8_t ff_mpeg12_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];
#define INIT_2D_VLC_RL(rl, static_size)\
{\
static RL_VLC_ELEM rl_vlc_table[static_size];\
INIT_VLC_STATIC(&rl.vlc, TEX_VLC_BITS, rl.n + 2,\
&rl.table_vlc[0][1], 4, 2,\
&rl.table_vlc[0][0], 4, 2, static_size);\
\
rl.rl_vlc[0]= rl_vlc_table;\
init_2d_vlc_rl(&rl);\
}
static void init_2d_vlc_rl(RLTable *rl)
{
int i;
for(i=0; i<rl->vlc.table_size; i++){
int code= rl->vlc.table[i][0];
int len = rl->vlc.table[i][1];
int level, run;
if(len==0){ // illegal code
run= 65;
level= MAX_LEVEL;
}else if(len<0){ //more bits needed
run= 0;
level= code;
}else{
if(code==rl->n){ //esc
run= 65;
level= 0;
}else if(code==rl->n+1){ //eob
run= 0;
level= 127;
}else{
run= rl->table_run [code] + 1;
level= rl->table_level[code];
}
}
rl->rl_vlc[0][i].len= len;
rl->rl_vlc[0][i].level= level;
rl->rl_vlc[0][i].run= run;
}
}
void ff_mpeg12_common_init(MpegEncContext *s)
{
s->y_dc_scale_table=
s->c_dc_scale_table= mpeg2_dc_scale_table[s->intra_dc_precision];
}
void ff_mpeg1_clean_buffers(MpegEncContext *s){
s->last_dc[0] = 1 << (7 + s->intra_dc_precision);
s->last_dc[1] = s->last_dc[0];
s->last_dc[2] = s->last_dc[0];
memset(s->last_mv, 0, sizeof(s->last_mv));
}
/******************************************/
/* decoding */
static VLC mv_vlc;
static VLC mbincr_vlc;
static VLC mb_ptype_vlc;
static VLC mb_btype_vlc;
static VLC mb_pat_vlc;
av_cold void ff_mpeg12_init_vlcs(void)
{
static int done = 0;
if (!done) {
done = 1;
INIT_VLC_STATIC(&dc_lum_vlc, DC_VLC_BITS, 12,
ff_mpeg12_vlc_dc_lum_bits, 1, 1,
ff_mpeg12_vlc_dc_lum_code, 2, 2, 512);
INIT_VLC_STATIC(&dc_chroma_vlc, DC_VLC_BITS, 12,
ff_mpeg12_vlc_dc_chroma_bits, 1, 1,
ff_mpeg12_vlc_dc_chroma_code, 2, 2, 514);
INIT_VLC_STATIC(&mv_vlc, MV_VLC_BITS, 17,
&ff_mpeg12_mbMotionVectorTable[0][1], 2, 1,
&ff_mpeg12_mbMotionVectorTable[0][0], 2, 1, 518);
INIT_VLC_STATIC(&mbincr_vlc, MBINCR_VLC_BITS, 36,
&ff_mpeg12_mbAddrIncrTable[0][1], 2, 1,
&ff_mpeg12_mbAddrIncrTable[0][0], 2, 1, 538);
INIT_VLC_STATIC(&mb_pat_vlc, MB_PAT_VLC_BITS, 64,
&ff_mpeg12_mbPatTable[0][1], 2, 1,
&ff_mpeg12_mbPatTable[0][0], 2, 1, 512);
INIT_VLC_STATIC(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7,
&table_mb_ptype[0][1], 2, 1,
&table_mb_ptype[0][0], 2, 1, 64);
INIT_VLC_STATIC(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11,
&table_mb_btype[0][1], 2, 1,
&table_mb_btype[0][0], 2, 1, 64);
init_rl(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
init_rl(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);
INIT_2D_VLC_RL(ff_rl_mpeg1, 680);
INIT_2D_VLC_RL(ff_rl_mpeg2, 674);
}
}
static inline int get_dmv(MpegEncContext *s)
{
if(get_bits1(&s->gb))
return 1 - (get_bits1(&s->gb) << 1);
else
return 0;
}
static inline int get_qscale(MpegEncContext *s)
{
int qscale = get_bits(&s->gb, 5);
if (s->q_scale_type) {
return non_linear_qscale[qscale];
} else {
return qscale << 1;
}
}
/* motion type (for MPEG-2) */
#define MT_FIELD 1
#define MT_FRAME 2
#define MT_16X8 2
#define MT_DMV 3
static int mpeg_decode_mb(MpegEncContext *s,
DCTELEM block[12][64])
{
int i, j, k, cbp, val, mb_type, motion_type;
const int mb_block_count = 4 + (1<< s->chroma_format);
dprintf(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 == FF_P_TYPE) {
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 FF_I_TYPE:
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 FF_P_TYPE:
mb_type = get_vlc2(&s->gb, 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 FF_B_TYPE:
mb_type = get_vlc2(&s->gb, 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;
}
dprintf(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 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);
}
}
if (s->codec_id == 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 (ff_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;
dprintf(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;
dprintf(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;
dprintf(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;
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] >> 1);
dmy = get_dmv(s);
s->last_mv[i][0][1] = my<<1;
s->last_mv[i][1][1] = my<<1;
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, 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 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);
}
}
if (s->codec_id == 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;
}
/* as H.263, but only 17 codes */
static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
{
int code, sign, val, l, shift;
code = get_vlc2(&s->gb, 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 */
l= INT_BIT - 5 - shift;
val = (val<<l)>>l;
return val;
}
inline int ff_mpeg1_decode_block_intra(MpegEncContext *s,
DCTELEM *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];
dprintf(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;
}
static inline int mpeg1_decode_block_inter(MpegEncContext *s,
DCTELEM *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;
}
#if MIN_CACHE_BITS < 19
UPDATE_CACHE(re, &s->gb);
#endif
/* 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 MIN_CACHE_BITS < 19
UPDATE_CACHE(re, &s->gb);
#endif
if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
break;
#if MIN_CACHE_BITS >= 19
UPDATE_CACHE(re, &s->gb);
#endif
}
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, DCTELEM *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;
}
#if MIN_CACHE_BITS < 19
UPDATE_CACHE(re, &s->gb);
#endif
/* 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 MIN_CACHE_BITS < 19
UPDATE_CACHE(re, &s->gb);
#endif
if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
break;
#if MIN_CACHE_BITS >= 19
UPDATE_CACHE(re, &s->gb);
#endif
}
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,
DCTELEM *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;
}
#if MIN_CACHE_BITS < 19
UPDATE_CACHE(re, &s->gb);
#endif
/* 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 MIN_CACHE_BITS < 19
UPDATE_CACHE(re, &s->gb);
#endif
if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
break;
#if MIN_CACHE_BITS >= 19
UPDATE_CACHE(re, &s->gb);
#endif
}
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,
DCTELEM *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;
}
#if MIN_CACHE_BITS < 19
UPDATE_CACHE(re, &s->gb);
#endif
/* 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 MIN_CACHE_BITS < 19
UPDATE_CACHE(re, &s->gb);
#endif
if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
break;
#if MIN_CACHE_BITS >=19
UPDATE_CACHE(re, &s->gb);
#endif
}
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,
DCTELEM *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);
dprintf(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,
DCTELEM *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;
}
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;
AVRational frame_rate_ext; ///< MPEG-2 specific framerate modificator
} Mpeg1Context;
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;
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;
return 0;
}
static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm,
const uint8_t *new_perm){
uint16_t temp_matrix[64];
int i;
memcpy(temp_matrix,matrix,64*sizeof(uint16_t));
for(i=0;i<64;i++){
matrix[new_perm[i]] = temp_matrix[old_perm[i]];
}
}
static enum PixelFormat mpeg_get_pixelformat(AVCodecContext *avctx){
Mpeg1Context *s1 = avctx->priv_data;
MpegEncContext *s = &s1->mpeg_enc_ctx;
if(avctx->xvmc_acceleration)
return avctx->get_format(avctx,pixfmt_xvmc_mpg2_420);
else if(avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU){
if(avctx->codec_id == CODEC_ID_MPEG1VIDEO)
return PIX_FMT_VDPAU_MPEG1;
else
return PIX_FMT_VDPAU_MPEG2;
}else{
if(s->chroma_format < 2)
return avctx->get_format(avctx,ff_hwaccel_pixfmt_list_420);
else if(s->chroma_format == 2)
return PIX_FMT_YUV422P;
else
return 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];
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||
0)
{
if (s1->mpeg_enc_ctx_allocated) {
ParseContext pc= s->parse_context;
s->parse_context.buffer=0;
MPV_common_end(s);
s->parse_context= pc;
}
if( (s->width == 0 )||(s->height == 0))
return -2;
avcodec_set_dimensions(avctx, s->width, s->height);
avctx->bit_rate = s->bit_rate;
s1->save_aspect_info = s->aspect_ratio_info;
s1->save_width = s->width;
s1->save_height = s->height;
/* 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);
assert((avctx->sub_id==1) == (avctx->codec_id==CODEC_ID_MPEG1VIDEO));
if(avctx->codec_id==CODEC_ID_MPEG1VIDEO){
//MPEG-1 fps
avctx->time_base.den= ff_frame_rate_tab[s->frame_rate_index].num;
avctx->time_base.num= ff_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_frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num*2,
ff_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){
//we ignore the spec here as reality does not match the spec, see for example
// res_change_ffmpeg_aspect.ts and sequence-display-aspect.mpg
if( (s1->pan_scan.width == 0 )||(s1->pan_scan.height == 0) || 1){
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}
);
}
}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->codec->id, avctx->pix_fmt);
//until then pix_fmt may be changed right after codec init
if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT ||
avctx->hwaccel ||
s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU )
if( avctx->idct_algo == FF_IDCT_AUTO )
avctx->idct_algo = FF_IDCT_SIMPLE;
/* Quantization matrices may need reordering
* if DCT permutation is changed. */
memcpy(old_permutation,s->dsp.idct_permutation,64*sizeof(uint8_t));
if (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;
if(mpeg_decode_postinit(s->avctx) < 0)
return -2;
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 == FF_P_TYPE || s->pict_type == FF_B_TYPE) {
s->full_pel[0] = get_bits1(&s->gb);
f_code = get_bits(&s->gb, 3);
if (f_code == 0 && avctx->error_recognition >= FF_ER_COMPLIANT)
return -1;
s->mpeg_f_code[0][0] = f_code;
s->mpeg_f_code[0][1] = f_code;
}
if (s->pict_type == FF_B_TYPE) {
s->full_pel[1] = get_bits1(&s->gb);
f_code = get_bits(&s->gb, 3);
if (f_code == 0 && avctx->error_recognition >= FF_ER_COMPLIANT)
return -1;
s->mpeg_f_code[1][0] = f_code;
s->mpeg_f_code[1][1] = f_code;
}
s->current_picture.pict_type= s->pict_type;
s->current_picture.key_frame= s->pict_type == FF_I_TYPE;
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;
s->first_slice = 1;
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;
dprintf(s->avctx, "sequence extension\n");
s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
s->avctx->sub_id = 2; /* indicates MPEG-2 found */
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){
skip_bits(&s->gb, 8); /* color primaries */
skip_bits(&s->gb, 8); /* transfer_characteristics */
skip_bits(&s->gb, 8); /* matrix_coefficients */
}
w= get_bits(&s->gb, 14);
skip_bits(&s->gb, 1); //marker
h= get_bits(&s->gb, 14);
skip_bits(&s->gb, 1); //marker
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 void mpeg_decode_quant_matrix_extension(MpegEncContext *s)
{
int i, v, j;
dprintf(s->avctx, "matrix extension\n");
if (get_bits1(&s->gb)) {
for(i=0;i<64;i++) {
v = get_bits(&s->gb, 8);
j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
s->intra_matrix[j] = v;
s->chroma_intra_matrix[j] = v;
}
}
if (get_bits1(&s->gb)) {
for(i=0;i<64;i++) {
v = get_bits(&s->gb, 8);
j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
s->inter_matrix[j] = v;
s->chroma_inter_matrix[j] = v;
}
}
if (get_bits1(&s->gb)) {
for(i=0;i<64;i++) {
v = get_bits(&s->gb, 8);
j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
s->chroma_intra_matrix[j] = v;
}
}
if (get_bits1(&s->gb)) {
for(i=0;i<64;i++) {
v = get_bits(&s->gb, 8);
j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
s->chroma_inter_matrix[j] = v;
}
}
}
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= FF_I_TYPE;
else
s->pict_type= FF_P_TYPE;
}else
s->pict_type= FF_B_TYPE;
s->current_picture.pict_type= s->pict_type;
s->current_picture.key_frame= s->pict_type == FF_I_TYPE;
s->first_slice= 1;
}
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->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 */
dprintf(s->avctx, "intra_dc_precision=%d\n", s->intra_dc_precision);
dprintf(s->avctx, "picture_structure=%d\n", s->picture_structure);
dprintf(s->avctx, "top field first=%d\n", s->top_field_first);
dprintf(s->avctx, "repeat first field=%d\n", s->repeat_first_field);
dprintf(s->avctx, "conceal=%d\n", s->concealment_motion_vectors);
dprintf(s->avctx, "intra_vlc_format=%d\n", s->intra_vlc_format);
dprintf(s->avctx, "alternate_scan=%d\n", s->alternate_scan);
dprintf(s->avctx, "frame_pred_frame_dct=%d\n", s->frame_pred_frame_dct);
dprintf(s->avctx, "progressive_frame=%d\n", s->progressive_frame);
}
static void mpeg_decode_extension(AVCodecContext *avctx,
const uint8_t *buf, int buf_size)
{
Mpeg1Context *s1 = avctx->priv_data;
MpegEncContext *s = &s1->mpeg_enc_ctx;
int ext_type;
init_get_bits(&s->gb, buf, buf_size*8);
ext_type = get_bits(&s->gb, 4);
switch(ext_type) {
case 0x1:
mpeg_decode_sequence_extension(s1);
break;
case 0x2:
mpeg_decode_sequence_display_extension(s1);
break;
case 0x3:
mpeg_decode_quant_matrix_extension(s);
break;
case 0x7:
mpeg_decode_picture_display_extension(s1);
break;
case 0x8:
mpeg_decode_picture_coding_extension(s1);
break;
}
}
static void exchange_uv(MpegEncContext *s){
DCTELEM (*tmp)[64];
tmp = s->pblocks[4];
s->pblocks[4] = s->pblocks[5];
s->pblocks[5] = tmp;
}
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){
if(MPV_frame_start(s, avctx) < 0)
return -1;
ff_er_frame_start(s);
/* first check if we must repeat the frame */
s->current_picture_ptr->repeat_pict = 0;
if (s->repeat_first_field) {
if (s->progressive_sequence) {
if (s->top_field_first)
s->current_picture_ptr->repeat_pict = 4;
else
s->current_picture_ptr->repeat_pict = 2;
} else if (s->progressive_frame) {
s->current_picture_ptr->repeat_pict = 1;
}
}
*s->current_picture_ptr->pan_scan= s1->pan_scan;
}else{ //second field
int i;
if(!s->current_picture_ptr){
av_log(s->avctx, AV_LOG_ERROR, "first field missing\n");
return -1;
}
for(i=0; i<4; i++){
s->current_picture.data[i] = s->current_picture_ptr->data[i];
if(s->picture_structure == PICT_BOTTOM_FIELD){
s->current_picture.data[i] += s->current_picture_ptr->linesize[i];
}
}
}
if (avctx->hwaccel) {
if (avctx->hwaccel->start_frame(avctx, buf, buf_size) < 0)
return -1;
}
// 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;
return 0;
}
#define DECODE_SLICE_ERROR -1
#define DECODE_SLICE_OK 0
/**
* decodes a slice. MpegEncContext.mb_y must be set to the MB row from the startcode
* @return DECODE_SLICE_ERROR if the slice is damaged<br>
* DECODE_SLICE_OK if this slice is ok<br>
*/
static int mpeg_decode_slice(Mpeg1Context *s1, int mb_y,
const uint8_t **buf, int buf_size)
{
MpegEncContext *s = &s1->mpeg_enc_ctx;
AVCodecContext *avctx= s->avctx;
const int field_pic= s->picture_structure != PICT_FRAME;
const int lowres= s->avctx->lowres;
s->resync_mb_x=
s->resync_mb_y= -1;
if (mb_y<<field_pic >= s->mb_height){
av_log(s->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)\n", mb_y, s->mb_height);
return -1;
}
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 (avctx->hwaccel) {
const uint8_t *buf_end, *buf_start = *buf - 4; /* include start_code */
int start_code = -1;
buf_end = ff_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;
}
for(;;) {
int code = get_vlc2(&s->gb, 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;
}
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 == FF_I_TYPE ? "I" : (s->pict_type == FF_P_TYPE ? "P" : (s->pict_type == FF_B_TYPE ? "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 1, we memcpy blocks in xvmcvideo.
if(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration > 1)
ff_xvmc_init_block(s);//set s->block
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 = field_pic ? 2*s->b8_stride : s->b8_stride;
int xy = s->mb_x*2 + s->mb_y*2*wrap;
int motion_x, motion_y, dir, i;
if(field_pic && !s->first_field)
xy += wrap/2;
for(i=0; i<2; i++){
for(dir=0; dir<2; dir++){
if (s->mb_intra || (dir==1 && s->pict_type != FF_B_TYPE)) {
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][xy ]=
s->current_picture.ref_index [dir][xy + 1]= s->field_select[dir][i];
assert(s->field_select[dir][i]==0 || s->field_select[dir][i]==1);
}
xy += wrap;
}
}
s->dest[0] += 16 >> lowres;
s->dest[1] +=(16 >> lowres) >> s->chroma_x_shift;
s->dest[2] +=(16 >> lowres) >> s->chroma_x_shift;
MPV_decode_mb(s, s->block);
if (++s->mb_x >= s->mb_width) {
const int mb_size= 16>>s->avctx->lowres;
ff_draw_horiz_band(s, mb_size*s->mb_y, mb_size);
s->mb_x = 0;
s->mb_y++;
if(s->mb_y<<field_pic >= s->mb_height){
int left= s->gb.size_in_bits - get_bits_count(&s->gb);
int is_d10= s->chroma_format==2 && s->pict_type==FF_I_TYPE && 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->error_recognition >= FF_ER_AGGRESSIVE && 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, 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 == FF_I_TYPE){
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 == FF_P_TYPE) {
/* 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;
} 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;
//printf("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;
s->error_count= 3*(s->end_mb_y - s->start_mb_y)*s->mb_width;
for(;;){
uint32_t start_code;
int ret;
ret= mpeg_decode_slice((Mpeg1Context*)s, mb_y, &buf, s->gb.buffer_end - buf);
emms_c();
//av_log(c, AV_LOG_DEBUG, "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->error_count);
if(ret < 0){
if(s->resync_mb_x>=0 && s->resync_mb_y>=0)
ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, AC_ERROR|DC_ERROR|MV_ERROR);
}else{
ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, AC_END|DC_END|MV_END);
}
if(s->mb_y == s->end_mb_y)
return 0;
start_code= -1;
buf = ff_find_start_code(buf, s->gb.buffer_end, &start_code);
mb_y= start_code - SLICE_MIN_START_CODE;
if(mb_y < 0 || mb_y >= s->end_mb_y)
return -1;
}
return 0; //not reached
}
/**
* Handles 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(CONFIG_MPEG_XVMC_DECODER && s->avctx->xvmc_acceleration)
ff_xvmc_field_end(s);
/* end of slice reached */
if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) {
/* end of image */
s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2;
ff_er_frame_end(s);
MPV_frame_end(s);
if (s->pict_type == FF_B_TYPE || s->low_delay) {
*pict= *(AVFrame*)s->current_picture_ptr;
ff_print_debug_info(s, pict);
} else {
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) {
*pict= *(AVFrame*)s->last_picture_ptr;
ff_print_debug_info(s, pict);
}
}
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)
return -1;
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->error_recognition >= FF_ER_COMPLIANT)
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)) {
for(i=0;i<64;i++) {
v = get_bits(&s->gb, 8);
if(v==0){
av_log(s->avctx, AV_LOG_ERROR, "intra matrix damaged\n");
return -1;
}
j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
s->intra_matrix[j] = v;
s->chroma_intra_matrix[j] = v;
}
#ifdef DEBUG
dprintf(s->avctx, "intra matrix present\n");
for(i=0;i<64;i++)
dprintf(s->avctx, " %d", s->intra_matrix[s->dsp.idct_permutation[i]]);
dprintf(s->avctx, "\n");
#endif
} 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)) {
for(i=0;i<64;i++) {
v = get_bits(&s->gb, 8);
if(v==0){
av_log(s->avctx, AV_LOG_ERROR, "inter matrix damaged\n");
return -1;
}
j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
s->inter_matrix[j] = v;
s->chroma_inter_matrix[j] = v;
}
#ifdef DEBUG
dprintf(s->avctx, "non-intra matrix present\n");
for(i=0;i<64;i++)
dprintf(s->avctx, " %d", s->inter_matrix[s->dsp.idct_permutation[i]]);
dprintf(s->avctx, "\n");
#endif
} 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= CODEC_ID_MPEG1VIDEO;
avctx->sub_id = 1; /* indicates MPEG-1 */
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) {
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->codec->id, avctx->pix_fmt);
if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT || avctx->hwaccel ||
s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU )
if( avctx->idct_algo == FF_IDCT_AUTO )
avctx->idct_algo = FF_IDCT_SIMPLE;
if (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= CODEC_ID_MPEG2VIDEO;
avctx->sub_id = 2; /* indicates MPEG-2 */
return 0;
}
static void mpeg_decode_user_data(AVCodecContext *avctx,
const uint8_t *buf, int buf_size)
{
const uint8_t *p;
int len, flags;
p = buf;
len = buf_size;
/* we parse the DTG active format information */
if (len >= 5 &&
p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
flags = p[4];
p += 5;
len -= 5;
if (flags & 0x80) {
/* skip event id */
if (len < 2)
return;
p += 2;
len -= 2;
}
if (flags & 0x40) {
if (len < 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 drop_frame_flag;
int time_code_hours, time_code_minutes;
int time_code_seconds, time_code_pictures;
int closed_gop, broken_link;
init_get_bits(&s->gb, buf, buf_size*8);
drop_frame_flag = get_bits1(&s->gb);
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);
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, closed_gop, broken_link);
}
/**
* Finds the end of the current frame in the bitstream.
* @return the position of the first byte of the next frame, or -1
*/
int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size, AVCodecParserContext *s)
{
int i;
uint32_t state= pc->state;
/* EOF considered as end of frame */
if (buf_size == 0)
return 0;
/*
0 frame start -> 1/4
1 first_SEQEXT -> 0/2
2 first field start -> 3/0
3 second_SEQEXT -> 2/0
4 searching end
*/
for(i=0; i<buf_size; i++){
assert(pc->frame_start_found>=0 && pc->frame_start_found<=4);
if(pc->frame_start_found&1){
if(state == EXT_START_CODE && (buf[i]&0xF0) != 0x80)
pc->frame_start_found--;
else if(state == EXT_START_CODE+2){
if((buf[i]&3) == 3) pc->frame_start_found= 0;
else pc->frame_start_found= (pc->frame_start_found+1)&3;
}
state++;
}else{
i= ff_find_start_code(buf+i, buf+buf_size, &state) - buf - 1;
if(pc->frame_start_found==0 && state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){
i++;
pc->frame_start_found=4;
}
if(state == SEQ_END_CODE){
pc->state=-1;
return i+1;
}
if(pc->frame_start_found==2 && state == SEQ_START_CODE)
pc->frame_start_found= 0;
if(pc->frame_start_found<4 && state == EXT_START_CODE)
pc->frame_start_found++;
if(pc->frame_start_found == 4 && (state&0xFFFFFF00) == 0x100){
if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
pc->frame_start_found=0;
pc->state=-1;
return i-3;
}
}
if(s && state == PICTURE_START_CODE){
ff_fetch_timestamp(s, i-4, 1);
}
}
}
pc->state= state;
return END_NOT_FOUND;
}
static int decode_chunks(AVCodecContext *avctx,
AVFrame *picture, int *data_size,
const uint8_t *buf, int buf_size);
/* handle buffering and image synchronisation */
static int mpeg_decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
const uint8_t *buf, int buf_size)
{
Mpeg1Context *s = avctx->priv_data;
AVFrame *picture = data;
MpegEncContext *s2 = &s->mpeg_enc_ctx;
dprintf(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) {
*picture= *(AVFrame*)s2->next_picture_ptr;
s2->next_picture_ptr= NULL;
*data_size = sizeof(AVFrame);
}
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 0
if (s->repeat_field % 2 == 1) {
s->repeat_field++;
//fprintf(stderr,"\nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number,
// s2->picture_number, s->repeat_field);
if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) {
*data_size = sizeof(AVPicture);
goto the_end;
}
}
#endif
if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == AV_RL32("VCR2"))
vcr2_init_sequence(avctx);
s->slice_count= 0;
if(avctx->extradata && !avctx->frame_number)
decode_chunks(avctx, picture, data_size, avctx->extradata, avctx->extradata_size);
return decode_chunks(avctx, picture, data_size, buf, buf_size);
}
static int decode_chunks(AVCodecContext *avctx,
AVFrame *picture, int *data_size,
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;
for(;;) {
/* find next start code */
uint32_t start_code = -1;
buf_ptr = ff_find_start_code(buf_ptr,buf_end, &start_code);
if (start_code > 0x1ff){
if(s2->pict_type != FF_B_TYPE || avctx->skip_frame <= AVDISCARD_DEFAULT){
if(avctx->thread_count > 1){
int i;
avctx->execute(avctx, slice_decode_thread, (void**)&(s2->thread_context[0]), NULL, s->slice_count, sizeof(void*));
for(i=0; i<s->slice_count; i++)
s2->error_count += s2->thread_context[i]->error_count;
}
if (CONFIG_MPEG_VDPAU_DECODER && avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU)
ff_vdpau_mpeg_picture_complete(s2, buf, buf_size, s->slice_count);
if (slice_end(avctx, picture)) {
if(s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice
*data_size = sizeof(AVPicture);
}
}
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:
mpeg1_decode_sequence(avctx, buf_ptr,
input_size);
break;
case PICTURE_START_CODE:
/* we have a complete image: we try to decompress it */
if(mpeg1_decode_picture(avctx,
buf_ptr, input_size) < 0)
s2->pict_type=0;
break;
case EXT_START_CODE:
mpeg_decode_extension(avctx,
buf_ptr, input_size);
break;
case USER_START_CODE:
mpeg_decode_user_data(avctx,
buf_ptr, input_size);
break;
case GOP_START_CODE:
s2->first_field=0;
mpeg_decode_gop(avctx,
buf_ptr, input_size);
break;
default:
if (start_code >= SLICE_MIN_START_CODE &&
start_code <= SLICE_MAX_START_CODE) {
int mb_y= start_code - SLICE_MIN_START_CODE;
if(s2->last_picture_ptr==NULL){
/* Skip B-frames if we do not have reference frames. */
if(s2->pict_type==FF_B_TYPE) break;
}
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==FF_P_TYPE && (s2->first_field || s2->picture_structure==PICT_FRAME)) break;
}
/* Skip B-frames if we are in a hurry. */
if(avctx->hurry_up && s2->pict_type==FF_B_TYPE) break;
if( (avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type==FF_B_TYPE)
||(avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type!=FF_I_TYPE)
|| avctx->skip_frame >= AVDISCARD_ALL)
break;
/* Skip everything if we are in a hurry>=5. */
if(avctx->hurry_up>=5) break;
if (!s->mpeg_enc_ctx_allocated) break;
if(s2->codec_id == 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");
break;
}
if(s2->first_slice){
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 -1;
}
if (avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU) {
s->slice_count++;
break;
}
if(avctx->thread_count > 1){
int threshold= (s2->mb_height*s->slice_count + avctx->thread_count/2) / avctx->thread_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;
ff_update_duplicate_context(thread_context, s2);
}
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(s, mb_y, &buf_ptr, input_size);
emms_c();
if(ret < 0){
if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0)
ff_er_add_slice(s2, s2->resync_mb_x, s2->resync_mb_y, s2->mb_x, s2->mb_y, AC_ERROR|DC_ERROR|MV_ERROR);
}else{
ff_er_add_slice(s2, s2->resync_mb_x, s2->resync_mb_y, s2->mb_x-1, s2->mb_y, AC_END|DC_END|MV_END);
}
}
}
break;
}
}
}
static int mpeg_decode_end(AVCodecContext *avctx)
{
Mpeg1Context *s = avctx->priv_data;
if (s->mpeg_enc_ctx_allocated)
MPV_common_end(&s->mpeg_enc_ctx);
return 0;
}
AVCodec mpeg1video_decoder = {
"mpeg1video",
CODEC_TYPE_VIDEO,
CODEC_ID_MPEG1VIDEO,
sizeof(Mpeg1Context),
mpeg_decode_init,
NULL,
mpeg_decode_end,
mpeg_decode_frame,
CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
.flush= ff_mpeg_flush,
.long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
};
AVCodec mpeg2video_decoder = {
"mpeg2video",
CODEC_TYPE_VIDEO,
CODEC_ID_MPEG2VIDEO,
sizeof(Mpeg1Context),
mpeg_decode_init,
NULL,
mpeg_decode_end,
mpeg_decode_frame,
CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
.flush= ff_mpeg_flush,
.long_name= NULL_IF_CONFIG_SMALL("MPEG-2 video"),
};
//legacy decoder
AVCodec mpegvideo_decoder = {
"mpegvideo",
CODEC_TYPE_VIDEO,
CODEC_ID_MPEG2VIDEO,
sizeof(Mpeg1Context),
mpeg_decode_init,
NULL,
mpeg_decode_end,
mpeg_decode_frame,
CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
.flush= ff_mpeg_flush,
.long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
};
#if CONFIG_MPEG_XVMC_DECODER
static av_cold int mpeg_mc_decode_init(AVCodecContext *avctx){
if( avctx->thread_count > 1)
return -1;
if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) )
return -1;
if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) ){
dprintf(avctx, "mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is set\n");
}
mpeg_decode_init(avctx);
avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT;
avctx->xvmc_acceleration = 2;//2 - the blocks are packed!
return 0;
}
AVCodec mpeg_xvmc_decoder = {
"mpegvideo_xvmc",
CODEC_TYPE_VIDEO,
CODEC_ID_MPEG2VIDEO_XVMC,
sizeof(Mpeg1Context),
mpeg_mc_decode_init,
NULL,
mpeg_decode_end,
mpeg_decode_frame,
CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY,
.flush= ff_mpeg_flush,
.long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video XvMC (X-Video Motion Compensation)"),
};
#endif
#if CONFIG_MPEG_VDPAU_DECODER
AVCodec mpeg_vdpau_decoder = {
"mpegvideo_vdpau",
CODEC_TYPE_VIDEO,
CODEC_ID_MPEG2VIDEO,
sizeof(Mpeg1Context),
mpeg_decode_init,
NULL,
mpeg_decode_end,
mpeg_decode_frame,
CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
.flush= ff_mpeg_flush,
.long_name = NULL_IF_CONFIG_SMALL("MPEG-1/2 video (VDPAU acceleration)"),
};
#endif
#if CONFIG_MPEG1_VDPAU_DECODER
AVCodec mpeg1_vdpau_decoder = {
"mpeg1video_vdpau",
CODEC_TYPE_VIDEO,
CODEC_ID_MPEG1VIDEO,
sizeof(Mpeg1Context),
mpeg_decode_init,
NULL,
mpeg_decode_end,
mpeg_decode_frame,
CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_HWACCEL_VDPAU | CODEC_CAP_DELAY,
.flush= ff_mpeg_flush,
.long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video (VDPAU acceleration)"),
};
#endif
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