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ffmpeg/libavcodec/h263dec.c
Reimar Döffinger 2aa8e33d7d Fix nonsense MPEG-4 hwaccel code. 
Issues with the code:
1) The skip_bits_long breaks packed B-frames since we skip
of the packed frame, even for VDPAU.
2) Calling ff_h263_find_resync_marker_reverse is nonsense for MPEG-4,
and for H.263 the only code using this (vaapi_mpeg4) explicitly reverts
this change!
3) mb_x/mb_y are always 0 when vaapi_mpeg4_decode_slice, so doing
computations with them is just obfuscation
4) due to not updating mb_y the code would always go into the error
resilience case, causing nonsense error messages and maybe further
issues.

While tested to fix the data provided to the decoder in case of
VDPAU so it is the same as for the non-hwaccel code, the VA-API code
was not tested to still work, and adding regression testing even
as a quick hack is much more complicated for it.

Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>
2013-09-22 16:08:35 +02:00

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/*
* H.263 decoder
* Copyright (c) 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
* H.263 decoder.
*/
#define UNCHECKED_BITSTREAM_READER 1
#include "libavutil/cpu.h"
#include "internal.h"
#include "avcodec.h"
#include "error_resilience.h"
#include "mpegvideo.h"
#include "h263.h"
#include "h263_parser.h"
#include "mpeg4video_parser.h"
#include "msmpeg4.h"
#include "vdpau_internal.h"
#include "thread.h"
#include "flv.h"
#include "mpeg4video.h"
av_cold int ff_h263_decode_init(AVCodecContext *avctx)
{
MpegEncContext *s = avctx->priv_data;
int ret;
s->avctx = avctx;
s->out_format = FMT_H263;
s->width = avctx->coded_width;
s->height = avctx->coded_height;
s->workaround_bugs= avctx->workaround_bugs;
// set defaults
ff_MPV_decode_defaults(s);
s->quant_precision=5;
s->decode_mb= ff_h263_decode_mb;
s->low_delay= 1;
if (avctx->codec->id == AV_CODEC_ID_MSS2)
avctx->pix_fmt = AV_PIX_FMT_YUV420P;
else
avctx->pix_fmt = avctx->get_format(avctx, avctx->codec->pix_fmts);
s->unrestricted_mv= 1;
/* select sub codec */
switch(avctx->codec->id) {
case AV_CODEC_ID_H263:
case AV_CODEC_ID_H263P:
s->unrestricted_mv= 0;
avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
break;
case AV_CODEC_ID_MPEG4:
break;
case AV_CODEC_ID_MSMPEG4V1:
s->h263_pred = 1;
s->msmpeg4_version=1;
break;
case AV_CODEC_ID_MSMPEG4V2:
s->h263_pred = 1;
s->msmpeg4_version=2;
break;
case AV_CODEC_ID_MSMPEG4V3:
s->h263_pred = 1;
s->msmpeg4_version=3;
break;
case AV_CODEC_ID_WMV1:
s->h263_pred = 1;
s->msmpeg4_version=4;
break;
case AV_CODEC_ID_WMV2:
s->h263_pred = 1;
s->msmpeg4_version=5;
break;
case AV_CODEC_ID_VC1:
case AV_CODEC_ID_WMV3:
case AV_CODEC_ID_VC1IMAGE:
case AV_CODEC_ID_WMV3IMAGE:
case AV_CODEC_ID_MSS2:
s->h263_pred = 1;
s->msmpeg4_version=6;
avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
break;
case AV_CODEC_ID_H263I:
break;
case AV_CODEC_ID_FLV1:
s->h263_flv = 1;
break;
default:
return AVERROR(EINVAL);
}
s->codec_id= avctx->codec->id;
avctx->hwaccel= ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
if (avctx->stream_codec_tag == AV_RL32("l263") && avctx->extradata_size == 56 && avctx->extradata[0] == 1)
s->ehc_mode = 1;
/* for h263, we allocate the images after having read the header */
if (avctx->codec->id != AV_CODEC_ID_H263 && avctx->codec->id != AV_CODEC_ID_H263P && avctx->codec->id != AV_CODEC_ID_MPEG4)
if ((ret = ff_MPV_common_init(s)) < 0)
return ret;
ff_h263_decode_init_vlc();
return 0;
}
av_cold int ff_h263_decode_end(AVCodecContext *avctx)
{
MpegEncContext *s = avctx->priv_data;
ff_MPV_common_end(s);
return 0;
}
/**
* Return the number of bytes consumed for building the current frame.
*/
static int get_consumed_bytes(MpegEncContext *s, int buf_size){
int pos= (get_bits_count(&s->gb)+7)>>3;
if(s->divx_packed || s->avctx->hwaccel){
//we would have to scan through the whole buf to handle the weird reordering ...
return buf_size;
}else if(s->flags&CODEC_FLAG_TRUNCATED){
pos -= s->parse_context.last_index;
if(pos<0) pos=0; // padding is not really read so this might be -1
return pos;
}else{
if(pos==0) pos=1; //avoid infinite loops (i doubt that is needed but ...)
if(pos+10>buf_size) pos=buf_size; // oops ;)
return pos;
}
}
static int decode_slice(MpegEncContext *s){
const int part_mask= s->partitioned_frame ? (ER_AC_END|ER_AC_ERROR) : 0x7F;
const int mb_size= 16>>s->avctx->lowres;
int ret;
s->last_resync_gb= s->gb;
s->first_slice_line= 1;
s->resync_mb_x= s->mb_x;
s->resync_mb_y= s->mb_y;
ff_set_qscale(s, s->qscale);
if (s->avctx->hwaccel) {
const uint8_t *start= s->gb.buffer + get_bits_count(&s->gb)/8;
ret = s->avctx->hwaccel->decode_slice(s->avctx, start, s->gb.buffer_end - start);
// ensure we exit decode loop
s->mb_y = s->mb_height;
return ret;
}
if(s->partitioned_frame){
const int qscale= s->qscale;
if(CONFIG_MPEG4_DECODER && s->codec_id==AV_CODEC_ID_MPEG4){
if ((ret = ff_mpeg4_decode_partitions(s)) < 0)
return ret;
}
/* restore variables which were modified */
s->first_slice_line=1;
s->mb_x= s->resync_mb_x;
s->mb_y= s->resync_mb_y;
ff_set_qscale(s, qscale);
}
for(; s->mb_y < s->mb_height; s->mb_y++) {
/* per-row end of slice checks */
if(s->msmpeg4_version){
if(s->resync_mb_y + s->slice_height == s->mb_y){
ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, ER_MB_END);
return 0;
}
}
if(s->msmpeg4_version==1){
s->last_dc[0]=
s->last_dc[1]=
s->last_dc[2]= 128;
}
ff_init_block_index(s);
for(; s->mb_x < s->mb_width; s->mb_x++) {
int ret;
ff_update_block_index(s);
if(s->resync_mb_x == s->mb_x && s->resync_mb_y+1 == s->mb_y){
s->first_slice_line=0;
}
/* DCT & quantize */
s->mv_dir = MV_DIR_FORWARD;
s->mv_type = MV_TYPE_16X16;
// s->mb_skipped = 0;
av_dlog(s, "%d %d %06X\n",
ret, get_bits_count(&s->gb), show_bits(&s->gb, 24));
ret= s->decode_mb(s, s->block);
if (s->pict_type!=AV_PICTURE_TYPE_B)
ff_h263_update_motion_val(s);
if(ret<0){
const int xy= s->mb_x + s->mb_y*s->mb_stride;
if(ret==SLICE_END){
ff_MPV_decode_mb(s, s->block);
if(s->loop_filter)
ff_h263_loop_filter(s);
ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_MB_END&part_mask);
s->padding_bug_score--;
if(++s->mb_x >= s->mb_width){
s->mb_x=0;
ff_mpeg_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
ff_MPV_report_decode_progress(s);
s->mb_y++;
}
return 0;
}else if(ret==SLICE_NOEND){
av_log(s->avctx, AV_LOG_ERROR, "Slice mismatch at MB: %d\n", xy);
ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x+1, s->mb_y, ER_MB_END&part_mask);
return AVERROR_INVALIDDATA;
}
av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_MB_ERROR&part_mask);
return AVERROR_INVALIDDATA;
}
ff_MPV_decode_mb(s, s->block);
if(s->loop_filter)
ff_h263_loop_filter(s);
}
ff_mpeg_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
ff_MPV_report_decode_progress(s);
s->mb_x= 0;
}
av_assert1(s->mb_x==0 && s->mb_y==s->mb_height);
if(s->codec_id==AV_CODEC_ID_MPEG4
&& (s->workaround_bugs&FF_BUG_AUTODETECT)
&& get_bits_left(&s->gb) >= 48
&& show_bits(&s->gb, 24)==0x4010
&& !s->data_partitioning)
s->padding_bug_score+=32;
/* try to detect the padding bug */
if( s->codec_id==AV_CODEC_ID_MPEG4
&& (s->workaround_bugs&FF_BUG_AUTODETECT)
&& get_bits_left(&s->gb) >=0
&& get_bits_left(&s->gb) < 137
// && !s->resync_marker
&& !s->data_partitioning){
const int bits_count= get_bits_count(&s->gb);
const int bits_left = s->gb.size_in_bits - bits_count;
if(bits_left==0){
s->padding_bug_score+=16;
} else if(bits_left != 1){
int v= show_bits(&s->gb, 8);
v|= 0x7F >> (7-(bits_count&7));
if(v==0x7F && bits_left<=8)
s->padding_bug_score--;
else if(v==0x7F && ((get_bits_count(&s->gb)+8)&8) && bits_left<=16)
s->padding_bug_score+= 4;
else
s->padding_bug_score++;
}
}
if(s->workaround_bugs&FF_BUG_AUTODETECT){
if(s->padding_bug_score > -2 && !s->data_partitioning /*&& (s->divx_version>=0 || !s->resync_marker)*/)
s->workaround_bugs |= FF_BUG_NO_PADDING;
else
s->workaround_bugs &= ~FF_BUG_NO_PADDING;
}
// handle formats which don't have unique end markers
if(s->msmpeg4_version || (s->workaround_bugs&FF_BUG_NO_PADDING)){ //FIXME perhaps solve this more cleanly
int left= get_bits_left(&s->gb);
int max_extra=7;
/* no markers in M$ crap */
if(s->msmpeg4_version && s->pict_type==AV_PICTURE_TYPE_I)
max_extra+= 17;
/* buggy padding but the frame should still end approximately at the bitstream end */
if((s->workaround_bugs&FF_BUG_NO_PADDING) && (s->err_recognition&(AV_EF_BUFFER|AV_EF_AGGRESSIVE)))
max_extra+= 48;
else if((s->workaround_bugs&FF_BUG_NO_PADDING))
max_extra+= 256*256*256*64;
if(left>max_extra){
av_log(s->avctx, AV_LOG_ERROR, "discarding %d junk bits at end, next would be %X\n", left, show_bits(&s->gb, 24));
}
else if(left<0){
av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
}else
ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, ER_MB_END);
return 0;
}
av_log(s->avctx, AV_LOG_ERROR, "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
get_bits_left(&s->gb),
show_bits(&s->gb, 24), s->padding_bug_score);
ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_MB_END&part_mask);
return AVERROR_INVALIDDATA;
}
int ff_h263_decode_frame(AVCodecContext *avctx,
void *data, int *got_frame,
AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
MpegEncContext *s = avctx->priv_data;
int ret;
AVFrame *pict = data;
s->flags= avctx->flags;
s->flags2= avctx->flags2;
/* no supplementary picture */
if (buf_size == 0) {
/* special case for last picture */
if (s->low_delay==0 && s->next_picture_ptr) {
if ((ret = av_frame_ref(pict, &s->next_picture_ptr->f)) < 0)
return ret;
s->next_picture_ptr= NULL;
*got_frame = 1;
}
return 0;
}
if(s->flags&CODEC_FLAG_TRUNCATED){
int next;
if(CONFIG_MPEG4_DECODER && s->codec_id==AV_CODEC_ID_MPEG4){
next= ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
}else if(CONFIG_H263_DECODER && s->codec_id==AV_CODEC_ID_H263){
next= ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
}else if(CONFIG_H263P_DECODER && s->codec_id==AV_CODEC_ID_H263P){
next= ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
}else{
av_log(s->avctx, AV_LOG_ERROR, "this codec does not support truncated bitstreams\n");
return AVERROR(EINVAL);
}
if( ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
return buf_size;
}
retry:
if(s->divx_packed && s->bitstream_buffer_size){
int i;
for(i=0; i<buf_size-3; i++){
if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1){
if(buf[i+3]==0xB0){
av_log(s->avctx, AV_LOG_WARNING, "Discarding excessive bitstream in packed xvid\n");
s->bitstream_buffer_size=0;
}
break;
}
}
}
if(s->bitstream_buffer_size && (s->divx_packed || buf_size<20)){ //divx 5.01+/xvid frame reorder
init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8);
}else
init_get_bits(&s->gb, buf, buf_size*8);
s->bitstream_buffer_size=0;
if (!s->context_initialized) {
if ((ret = ff_MPV_common_init(s)) < 0) //we need the idct permutaton for reading a custom matrix
return ret;
}
/* We need to set current_picture_ptr before reading the header,
* otherwise we cannot store anyting in there */
if (s->current_picture_ptr == NULL || s->current_picture_ptr->f.data[0]) {
int i= ff_find_unused_picture(s, 0);
if (i < 0)
return i;
s->current_picture_ptr= &s->picture[i];
}
/* let's go :-) */
if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5) {
ret= ff_wmv2_decode_picture_header(s);
} else if (CONFIG_MSMPEG4_DECODER && s->msmpeg4_version) {
ret = ff_msmpeg4_decode_picture_header(s);
} else if (CONFIG_MPEG4_DECODER && s->h263_pred) {
if(s->avctx->extradata_size && s->picture_number==0){
GetBitContext gb;
init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
ret = ff_mpeg4_decode_picture_header(s, &gb);
}
ret = ff_mpeg4_decode_picture_header(s, &s->gb);
} else if (CONFIG_H263I_DECODER && s->codec_id == AV_CODEC_ID_H263I) {
ret = ff_intel_h263_decode_picture_header(s);
} else if (CONFIG_FLV_DECODER && s->h263_flv) {
ret = ff_flv_decode_picture_header(s);
} else {
ret = ff_h263_decode_picture_header(s);
}
if (ret < 0 || ret==FRAME_SKIPPED) {
if ( s->width != avctx->coded_width
|| s->height != avctx->coded_height) {
av_log(s->avctx, AV_LOG_WARNING, "Reverting picture dimensions change due to header decoding failure\n");
s->width = avctx->coded_width;
s->height= avctx->coded_height;
}
}
if(ret==FRAME_SKIPPED) return get_consumed_bytes(s, buf_size);
/* skip if the header was thrashed */
if (ret < 0){
av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
return ret;
}
avctx->has_b_frames= !s->low_delay;
if(s->xvid_build==-1 && s->divx_version==-1 && s->lavc_build==-1){
if(s->stream_codec_tag == AV_RL32("XVID") ||
s->codec_tag == AV_RL32("XVID") || s->codec_tag == AV_RL32("XVIX") ||
s->codec_tag == AV_RL32("RMP4") || s->codec_tag == AV_RL32("ZMP4") ||
s->codec_tag == AV_RL32("SIPP")
)
s->xvid_build= 0;
#if 0
if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==1
&& s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc
s->xvid_build= 0;
#endif
}
if(s->xvid_build==-1 && s->divx_version==-1 && s->lavc_build==-1){
if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==0)
s->divx_version= 400; //divx 4
}
if(s->xvid_build>=0 && s->divx_version>=0){
s->divx_version=
s->divx_build= -1;
}
if(s->workaround_bugs&FF_BUG_AUTODETECT){
if(s->codec_tag == AV_RL32("XVIX"))
s->workaround_bugs|= FF_BUG_XVID_ILACE;
if(s->codec_tag == AV_RL32("UMP4")){
s->workaround_bugs|= FF_BUG_UMP4;
}
if(s->divx_version>=500 && s->divx_build<1814){
s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
}
if(s->divx_version>502 && s->divx_build<1814){
s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
}
if(s->xvid_build<=3U)
s->padding_bug_score= 256*256*256*64;
if(s->xvid_build<=1U)
s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
if(s->xvid_build<=12U)
s->workaround_bugs|= FF_BUG_EDGE;
if(s->xvid_build<=32U)
s->workaround_bugs|= FF_BUG_DC_CLIP;
#define SET_QPEL_FUNC(postfix1, postfix2) \
s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
if(s->lavc_build<4653U)
s->workaround_bugs|= FF_BUG_STD_QPEL;
if(s->lavc_build<4655U)
s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
if(s->lavc_build<4670U){
s->workaround_bugs|= FF_BUG_EDGE;
}
if(s->lavc_build<=4712U)
s->workaround_bugs|= FF_BUG_DC_CLIP;
if(s->divx_version>=0)
s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
if(s->divx_version==501 && s->divx_build==20020416)
s->padding_bug_score= 256*256*256*64;
if(s->divx_version<500U){
s->workaround_bugs|= FF_BUG_EDGE;
}
if(s->divx_version>=0)
s->workaround_bugs|= FF_BUG_HPEL_CHROMA;
#if 0
if(s->divx_version==500)
s->padding_bug_score= 256*256*256*64;
/* very ugly XVID padding bug detection FIXME/XXX solve this differently
* Let us hope this at least works.
*/
if( s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==-1
&& s->codec_id==AV_CODEC_ID_MPEG4 && s->vo_type==0)
s->workaround_bugs|= FF_BUG_NO_PADDING;
if(s->lavc_build<4609U) //FIXME not sure about the version num but a 4609 file seems ok
s->workaround_bugs|= FF_BUG_NO_PADDING;
#endif
}
if(s->workaround_bugs& FF_BUG_STD_QPEL){
SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
}
if(avctx->debug & FF_DEBUG_BUGS)
av_log(s->avctx, AV_LOG_DEBUG, "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
s->workaround_bugs, s->lavc_build, s->xvid_build, s->divx_version, s->divx_build,
s->divx_packed ? "p" : "");
#if HAVE_MMX
if (s->codec_id == AV_CODEC_ID_MPEG4 && s->xvid_build>=0 && avctx->idct_algo == FF_IDCT_AUTO && (av_get_cpu_flags() & AV_CPU_FLAG_MMX)) {
avctx->idct_algo= FF_IDCT_XVIDMMX;
ff_dct_common_init(s);
goto retry;
}
#endif
/* After H263 & mpeg4 header decode we have the height, width,*/
/* and other parameters. So then we could init the picture */
/* FIXME: By the way H263 decoder is evolving it should have */
/* an H263EncContext */
if ((!avctx->coded_width || !avctx->coded_height) && 0) {
ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat
s->parse_context.buffer=0;
ff_MPV_common_end(s);
s->parse_context= pc;
avcodec_set_dimensions(avctx, s->width, s->height);
goto retry;
}
if (s->width != avctx->coded_width ||
s->height != avctx->coded_height ||
s->context_reinit) {
/* H.263 could change picture size any time */
s->context_reinit = 0;
avcodec_set_dimensions(avctx, s->width, s->height);
if ((ret = ff_MPV_common_frame_size_change(s)))
return ret;
}
if((s->codec_id==AV_CODEC_ID_H263 || s->codec_id==AV_CODEC_ID_H263P || s->codec_id == AV_CODEC_ID_H263I))
s->gob_index = ff_h263_get_gob_height(s);
// for skipping the frame
s->current_picture.f.pict_type = s->pict_type;
s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I;
/* skip B-frames if we don't have reference frames */
if (s->last_picture_ptr == NULL &&
(s->pict_type == AV_PICTURE_TYPE_B || s->droppable))
return get_consumed_bytes(s, buf_size);
if( (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==AV_PICTURE_TYPE_B)
|| (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=AV_PICTURE_TYPE_I)
|| avctx->skip_frame >= AVDISCARD_ALL)
return get_consumed_bytes(s, buf_size);
if(s->next_p_frame_damaged){
if(s->pict_type==AV_PICTURE_TYPE_B)
return get_consumed_bytes(s, buf_size);
else
s->next_p_frame_damaged=0;
}
if((!s->no_rounding) || s->pict_type==AV_PICTURE_TYPE_B){
s->me.qpel_put= s->dsp.put_qpel_pixels_tab;
s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
}else{
s->me.qpel_put= s->dsp.put_no_rnd_qpel_pixels_tab;
s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
}
if ((ret = ff_MPV_frame_start(s, avctx)) < 0)
return ret;
if (!s->divx_packed && !avctx->hwaccel)
ff_thread_finish_setup(avctx);
if (CONFIG_MPEG4_VDPAU_DECODER && (s->avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU)) {
ff_vdpau_mpeg4_decode_picture(s, s->gb.buffer, s->gb.buffer_end - s->gb.buffer);
goto frame_end;
}
if (avctx->hwaccel) {
if ((ret = avctx->hwaccel->start_frame(avctx, s->gb.buffer, s->gb.buffer_end - s->gb.buffer)) < 0)
return ret;
}
ff_mpeg_er_frame_start(s);
//the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type
//which is not available before ff_MPV_frame_start()
if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5){
ret = ff_wmv2_decode_secondary_picture_header(s);
if(ret<0) return ret;
if(ret==1) goto frame_end;
}
/* decode each macroblock */
s->mb_x=0;
s->mb_y=0;
ret = decode_slice(s);
while(s->mb_y<s->mb_height){
if(s->msmpeg4_version){
if(s->slice_height==0 || s->mb_x!=0 || (s->mb_y%s->slice_height)!=0 || get_bits_left(&s->gb)<0)
break;
}else{
int prev_x=s->mb_x, prev_y=s->mb_y;
if(ff_h263_resync(s)<0)
break;
if (prev_y * s->mb_width + prev_x < s->mb_y * s->mb_width + s->mb_x)
s->er.error_occurred = 1;
}
if(s->msmpeg4_version<4 && s->h263_pred)
ff_mpeg4_clean_buffers(s);
if (decode_slice(s) < 0) ret = AVERROR_INVALIDDATA;
}
if (s->msmpeg4_version && s->msmpeg4_version<4 && s->pict_type==AV_PICTURE_TYPE_I)
if(!CONFIG_MSMPEG4_DECODER || ff_msmpeg4_decode_ext_header(s, buf_size) < 0){
s->er.error_status_table[s->mb_num - 1] = ER_MB_ERROR;
}
av_assert1(s->bitstream_buffer_size==0);
frame_end:
ff_er_frame_end(&s->er);
if (avctx->hwaccel) {
if ((ret = avctx->hwaccel->end_frame(avctx)) < 0)
return ret;
}
ff_MPV_frame_end(s);
/* divx 5.01+ bitstream reorder stuff */
/* Since this clobbers the input buffer and hwaccel codecs still need the
* data during hwaccel->end_frame we should not do this any earlier */
if(s->codec_id==AV_CODEC_ID_MPEG4 && s->divx_packed){
int current_pos= s->gb.buffer == s->bitstream_buffer ? 0 : (get_bits_count(&s->gb)>>3);
int startcode_found=0;
if(buf_size - current_pos > 7){
int i;
for(i=current_pos; i<buf_size-4; i++){
if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
startcode_found=!(buf[i+4]&0x40);
break;
}
}
}
if(startcode_found){
av_fast_malloc(
&s->bitstream_buffer,
&s->allocated_bitstream_buffer_size,
buf_size - current_pos + FF_INPUT_BUFFER_PADDING_SIZE);
if (!s->bitstream_buffer)
return AVERROR(ENOMEM);
memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
s->bitstream_buffer_size= buf_size - current_pos;
}
}
if (!s->divx_packed && avctx->hwaccel)
ff_thread_finish_setup(avctx);
av_assert1(s->current_picture.f.pict_type == s->current_picture_ptr->f.pict_type);
av_assert1(s->current_picture.f.pict_type == s->pict_type);
if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
if ((ret = av_frame_ref(pict, &s->current_picture_ptr->f)) < 0)
return ret;
ff_print_debug_info(s, s->current_picture_ptr, pict);
ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG1);
} else if (s->last_picture_ptr != NULL) {
if ((ret = av_frame_ref(pict, &s->last_picture_ptr->f)) < 0)
return ret;
ff_print_debug_info(s, s->last_picture_ptr, pict);
ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_QSCALE_TYPE_MPEG1);
}
if(s->last_picture_ptr || s->low_delay){
if ( pict->format == AV_PIX_FMT_YUV420P
&& (s->codec_tag == AV_RL32("GEOV") || s->codec_tag == AV_RL32("GEOX"))) {
int x, y, p;
av_frame_make_writable(pict);
for (p=0; p<3; p++) {
int w = FF_CEIL_RSHIFT(pict-> width, !!p);
int h = FF_CEIL_RSHIFT(pict->height, !!p);
int linesize = pict->linesize[p];
for (y=0; y<(h>>1); y++)
for (x=0; x<w; x++)
FFSWAP(int,
pict->data[p][x + y*linesize],
pict->data[p][x + (h-1-y)*linesize]);
}
}
*got_frame = 1;
}
return (ret && (avctx->err_recognition & AV_EF_EXPLODE))?ret:get_consumed_bytes(s, buf_size);
}
const enum AVPixelFormat ff_h263_hwaccel_pixfmt_list_420[] = {
#if CONFIG_VAAPI
AV_PIX_FMT_VAAPI_VLD,
#endif
#if CONFIG_VDPAU
AV_PIX_FMT_VDPAU,
#endif
AV_PIX_FMT_YUV420P,
AV_PIX_FMT_NONE
};
AVCodec ff_h263_decoder = {
.name = "h263",
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_H263,
.priv_data_size = sizeof(MpegEncContext),
.init = ff_h263_decode_init,
.close = ff_h263_decode_end,
.decode = ff_h263_decode_frame,
.capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
.flush = ff_mpeg_flush,
.max_lowres = 3,
.long_name = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
.pix_fmts = ff_h263_hwaccel_pixfmt_list_420,
};
AVCodec ff_h263p_decoder = {
.name = "h263p",
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_H263P,
.priv_data_size = sizeof(MpegEncContext),
.init = ff_h263_decode_init,
.close = ff_h263_decode_end,
.decode = ff_h263_decode_frame,
.capabilities = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
.flush = ff_mpeg_flush,
.max_lowres = 3,
.long_name = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
.pix_fmts = ff_h263_hwaccel_pixfmt_list_420,
};
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