/*
* MPEG-1/2 decoder
- * Copyright (c) 2000,2001 Fabrice Bellard
+ * Copyright (c) 2000, 2001 Fabrice Bellard
* Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
*
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * 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.
*
- * FFmpeg is distributed in the hope that it will be useful,
+ * 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 FFmpeg; if not, write to the Free Software
+ * License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
* MPEG-1/2 decoder
*/
-//#define DEBUG
+#include "libavutil/attributes.h"
#include "internal.h"
#include "avcodec.h"
-#include "dsputil.h"
#include "mpegvideo.h"
-
+#include "error_resilience.h"
#include "mpeg12.h"
#include "mpeg12data.h"
-#include "mpeg12decdata.h"
+#include "mpegvideodata.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_intra(MpegEncContext *s,
- DCTELEM *block,
- int n);
-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};
+#include "thread.h"
uint8_t ff_mpeg12_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];
+static const uint8_t table_mb_ptype[7][2] = {
+ { 3, 5 }, // 0x01 MB_INTRA
+ { 1, 2 }, // 0x02 MB_PAT
+ { 1, 3 }, // 0x08 MB_FOR
+ { 1, 1 }, // 0x0A MB_FOR|MB_PAT
+ { 1, 6 }, // 0x11 MB_QUANT|MB_INTRA
+ { 1, 5 }, // 0x12 MB_QUANT|MB_PAT
+ { 2, 5 }, // 0x1A MB_QUANT|MB_FOR|MB_PAT
+};
+
+static const uint8_t table_mb_btype[11][2] = {
+ { 3, 5 }, // 0x01 MB_INTRA
+ { 2, 3 }, // 0x04 MB_BACK
+ { 3, 3 }, // 0x06 MB_BACK|MB_PAT
+ { 2, 4 }, // 0x08 MB_FOR
+ { 3, 4 }, // 0x0A MB_FOR|MB_PAT
+ { 2, 2 }, // 0x0C MB_FOR|MB_BACK
+ { 3, 2 }, // 0x0E MB_FOR|MB_BACK|MB_PAT
+ { 1, 6 }, // 0x11 MB_QUANT|MB_INTRA
+ { 2, 6 }, // 0x16 MB_QUANT|MB_BACK|MB_PAT
+ { 3, 6 }, // 0x1A MB_QUANT|MB_FOR|MB_PAT
+ { 2, 5 }, // 0x1E MB_QUANT|MB_FOR|MB_BACK|MB_PAT
+};
#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.table_vlc[0][1], 4, 2,\
+ &rl.table_vlc[0][0], 4, 2, static_size);\
\
- rl.rl_vlc[0]= rl_vlc_table;\
+ rl.rl_vlc[0] = rl_vlc_table;\
init_2d_vlc_rl(&rl);\
}
-static void init_2d_vlc_rl(RLTable *rl)
+static av_cold 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];
+ 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];
+ 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;
+ 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)
+av_cold void ff_mpeg12_common_init(MpegEncContext *s)
{
- s->y_dc_scale_table=
- s->c_dc_scale_table= ff_mpeg2_dc_scale_table[s->intra_dc_precision];
+ s->y_dc_scale_table =
+ s->c_dc_scale_table = ff_mpeg2_dc_scale_table[s->intra_dc_precision];
}
-void ff_mpeg1_clean_buffers(MpegEncContext *s){
+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];
/******************************************/
/* decoding */
-static VLC mv_vlc;
-static VLC mbincr_vlc;
-static VLC mb_ptype_vlc;
-static VLC mb_btype_vlc;
-static VLC mb_pat_vlc;
+VLC ff_mv_vlc;
+
+VLC ff_dc_lum_vlc;
+VLC ff_dc_chroma_vlc;
+
+VLC ff_mbincr_vlc;
+VLC ff_mb_ptype_vlc;
+VLC ff_mb_btype_vlc;
+VLC ff_mb_pat_vlc;
av_cold void ff_mpeg12_init_vlcs(void)
{
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_VLC_STATIC(&ff_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(&ff_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(&ff_mv_vlc, MV_VLC_BITS, 17,
+ &ff_mpeg12_mbMotionVectorTable[0][1], 2, 1,
+ &ff_mpeg12_mbMotionVectorTable[0][0], 2, 1, 518);
+ INIT_VLC_STATIC(&ff_mbincr_vlc, MBINCR_VLC_BITS, 36,
+ &ff_mpeg12_mbAddrIncrTable[0][1], 2, 1,
+ &ff_mpeg12_mbAddrIncrTable[0][0], 2, 1, 538);
+ INIT_VLC_STATIC(&ff_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(&ff_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(&ff_mb_btype_vlc, MB_BTYPE_VLC_BITS, 11,
+ &table_mb_btype[0][1], 2, 1,
+ &table_mb_btype[0][0], 2, 1, 64);
+ ff_rl_init(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
+ ff_rl_init(&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])
+/**
+ * Find 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, 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;
- }
+ int i;
+ uint32_t state = pc->state;
+ /* EOF considered as end of frame */
+ if (buf_size == 0)
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);
- }
- }
+/*
+ 0 frame start -> 1/4
+ 1 first_SEQEXT -> 0/2
+ 2 first field start -> 3/0
+ 3 second_SEQEXT -> 2/0
+ 4 searching end
+*/
- 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;
- }
+ 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 {
- 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;
- 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;
- 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, 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]);
+ i = avpriv_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 (cbp <= 0){
- av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y);
- return -1;
+ if (state == SEQ_END_CODE) {
+ pc->frame_start_found = 0;
+ pc->state=-1;
+ return i+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 (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->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;
- }
- }
+ if (pc->frame_start_found == 0 && s && state == PICTURE_START_CODE) {
+ ff_fetch_timestamp(s, i - 3, 1);
}
- }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;
+ pc->state = state;
+ return END_NOT_FOUND;
}
-/* 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;
-}
+#define MAX_INDEX (64 - 1)
-static inline int mpeg1_decode_block_intra(MpegEncContext *s,
- DCTELEM *block,
- int n)
+int ff_mpeg1_decode_block_intra(GetBitContext *gb,
+ const uint16_t *quant_matrix,
+ uint8_t *const scantable, int last_dc[3],
+ int16_t *block, int index, int qscale)
{
- int level, dc, diff, i, j, run;
- int component;
+ int dc, diff, i = 0, 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;
- }
+ component = index <= 3 ? 0 : index - 4 + 1;
- block[j] = level;
- }
- CLOSE_READER(re, &s->gb);
- }
- s->block_last_index[n] = i;
- return 0;
-}
+ diff = decode_dc(gb, component);
+ if (diff >= 0xffff)
+ return AVERROR_INVALIDDATA;
-int ff_mpeg1_decode_block_intra(MpegEncContext *s,
- DCTELEM *block,
- int n)
-{
- return mpeg1_decode_block_intra(s, block, n);
-}
+ dc = last_dc[component];
+ dc += diff;
+ last_dc[component] = dc;
-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;
+ block[0] = dc * quant_matrix[0];
{
- 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
+ OPEN_READER(re, gb);
/* now quantify & encode AC coefficients */
- for(;;) {
- GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
+ while (1) {
+ int level, run, j;
- 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;
- }
+ UPDATE_CACHE(re, gb);
+ GET_RL_VLC(level, run, re, gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
- 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)
+ if (level == 127) {
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) {
+ } else if (level != 0) {
i += run;
+ if (i > MAX_INDEX)
+ break;
+
j = scantable[i];
- level= ((level*2+1)*qscale)>>1;
- level= (level-1)|1;
- level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
- SKIP_BITS(re, &s->gb, 1);
+ level = (level * qscale * quant_matrix[j]) >> 4;
+ level = (level - 1) | 1;
+ level = (level ^ SHOW_SBITS(re, gb, 1)) -
+ SHOW_SBITS(re, gb, 1);
+ LAST_SKIP_BITS(re, 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);
+ run = SHOW_UBITS(re, gb, 6) + 1;
+ LAST_SKIP_BITS(re, gb, 6);
+ UPDATE_CACHE(re, gb);
+ level = SHOW_SBITS(re, gb, 8);
+ SKIP_BITS(re, gb, 8);
+
if (level == -128) {
- level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8);
+ level = SHOW_UBITS(re, gb, 8) - 256;
+ LAST_SKIP_BITS(re, gb, 8);
} else if (level == 0) {
- level = SHOW_UBITS(re, &s->gb, 8) ; SKIP_BITS(re, &s->gb, 8);
+ level = SHOW_UBITS(re, gb, 8);
+ LAST_SKIP_BITS(re, 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);
+ if (i > MAX_INDEX)
+ break;
- 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 (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;
- }
- 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;
+ CLOSE_READER(re, gb);
}
- 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;
+ if (i > MAX_INDEX)
+ i = AVERROR_INVALIDDATA;
- s->block_last_index[n] = i;
- return 0;
+ return i;
}
-
-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, 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?
-} 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;
- avctx->color_range= AVCOL_RANGE_MPEG;
- if (avctx->codec->id == CODEC_ID_MPEG1VIDEO)
- avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
- else
- avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
- 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||
- s1->save_progressive_seq != s->progressive_sequence ||
- 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;
- 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);
-
- 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;
-
- 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;
- 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){
- 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)
-{
- dprintf(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= 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->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_ERROR, "invalid frame_pred_frame_dct\n");
- s->frame_pred_frame_dct= 1;
- }
-
- 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 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;
-
- 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{
- 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;
- }
-
- 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;
- }
-
- 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 = 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 != 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][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 >> 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>>field_pic), mb_size);
-
- 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==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) & 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;
- const int field_pic= s->picture_structure != PICT_FRAME;
-
- s->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((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
-}
-
-/**
- * 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(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)) {
- 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= 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 */
- 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 drop_frame_flag;
- 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);
-
- 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);
-
- s->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, s->closed_gop, broken_link);
-}
-/**
- * Find 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(pc->frame_start_found == 0 && s && state == PICTURE_START_CODE){
- ff_fetch_timestamp(s, i-3, 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,
- 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;
- 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;
- int last_code= 0;
-
- 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, &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:
- 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);
- }
- break;
-
- case PICTURE_START_CODE:
- if(last_code == 0 || last_code == SLICE_MIN_START_CODE){
- if(mpeg_decode_postinit(avctx) < 0){
- av_log(avctx, AV_LOG_ERROR, "mpeg_decode_postinit() failure\n");
- return -1;
- }
-
- /* 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);
- }
- 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);
- }
- 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);
- }
- 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);
- }
- 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==FF_B_TYPE){
- if(!s2->closed_gop)
- break;
- }
- }
- if(s2->pict_type==FF_I_TYPE)
- 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==FF_P_TYPE && !s->sync) 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 void flush(AVCodecContext *avctx){
- Mpeg1Context *s = avctx->priv_data;
-
- s->sync=0;
-
- ff_mpeg_flush(avctx);
-}
-
-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",
- AVMEDIA_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= flush,
- .max_lowres= 3,
- .long_name= NULL_IF_CONFIG_SMALL("MPEG-1 video"),
-};
-
-AVCodec mpeg2video_decoder = {
- "mpeg2video",
- AVMEDIA_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= flush,
- .max_lowres= 3,
- .long_name= NULL_IF_CONFIG_SMALL("MPEG-2 video"),
-};
-
-//legacy decoder
-AVCodec mpegvideo_decoder = {
- "mpegvideo",
- AVMEDIA_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= flush,
- .max_lowres= 3,
- .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",
- AVMEDIA_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= 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",
- AVMEDIA_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= 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",
- AVMEDIA_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= flush,
- .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 video (VDPAU acceleration)"),
-};
-#endif
-
projects / ffmpeg / blobdiff