* Copyright (c) 2001 Fabrice Bellard
* Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
*
- * This file is part of Libav.
+ * This file is part of FFmpeg.
*
- * Libav is free software; you can redistribute it and/or
+ * 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.
*
- * Libav is distributed in the hope that it will be useful,
+ * 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 Libav; if not, write to the Free Software
+ * License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
* H.263 decoder.
*/
+#define UNCHECKED_BITSTREAM_READER 1
+
#include "libavutil/cpu.h"
#include "internal.h"
#include "avcodec.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;
/* 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;
s->h263_flv = 1;
break;
default:
- return -1;
+ return AVERROR(EINVAL);
}
s->codec_id= avctx->codec->id;
avctx->hwaccel= ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
/* 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_MPEG4)
- if (ff_MPV_common_init(s) < 0)
- return -1;
+ 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(s);
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;
+ const int mb_size= 16>>s->avctx->lowres;
+ int ret;
+
s->last_resync_gb= s->gb;
s->first_slice_line= 1;
if (s->avctx->hwaccel) {
const uint8_t *start= s->gb.buffer + get_bits_count(&s->gb)/8;
- const uint8_t *end = ff_h263_find_resync_marker(start + 1, s->gb.buffer_end);
+ const uint8_t *end = ff_h263_find_resync_marker(s, start + 1, s->gb.buffer_end);
skip_bits_long(&s->gb, 8*(end - start));
return s->avctx->hwaccel->decode_slice(s->avctx, start, end - start);
}
const int qscale= s->qscale;
if(CONFIG_MPEG4_DECODER && s->codec_id==AV_CODEC_ID_MPEG4){
- if(ff_mpeg4_decode_partitions(s) < 0)
- return -1;
+ if ((ret = ff_mpeg4_decode_partitions(s)) < 0)
+ return ret;
}
/* restore variables which were modified */
}else if(ret==SLICE_NOEND){
av_log(s->avctx, AV_LOG_ERROR, "Slice mismatch at MB: %d\n", xy);
ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x+1, s->mb_y, ER_MB_END&part_mask);
- return -1;
+ return AVERROR_INVALIDDATA;
}
av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_MB_ERROR&part_mask);
- return -1;
+ return AVERROR_INVALIDDATA;
}
ff_MPV_decode_mb(s, s->block);
s->mb_x= 0;
}
- assert(s->mb_x==0 && s->mb_y==s->mb_height);
+ 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)
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) < 48
+ && get_bits_left(&s->gb) < 137
// && !s->resync_marker
&& !s->data_partitioning){
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))
+ 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;
ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_MB_END&part_mask);
- return -1;
+ return AVERROR_INVALIDDATA;
}
int ff_h263_decode_frame(AVCodecContext *avctx,
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 -1;
+ return AVERROR(EINVAL);
}
if( ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
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);
s->bitstream_buffer_size=0;
if (!s->context_initialized) {
- if (ff_MPV_common_init(s) < 0) //we need the idct permutaton for reading a custom matrix
- return -1;
+ 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,
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 -1;
+ return ret;
}
avctx->has_b_frames= !s->low_delay;
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);
- s->picture_number=0;
+ goto retry;
}
#endif
/* FIXME: By the way H263 decoder is evolving it should have */
/* an H263EncContext */
- if (!avctx->coded_width || !avctx->coded_height) {
+ 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;
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->dropable)) return get_consumed_bytes(s, buf_size);
+ 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)
s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
}
- if(ff_MPV_frame_start(s, avctx) < 0)
- return -1;
+ if ((ret = ff_MPV_frame_start(s, avctx)) < 0)
+ return ret;
if (!s->divx_packed) ff_thread_finish_setup(avctx);
}
if (avctx->hwaccel) {
- if (avctx->hwaccel->start_frame(avctx, s->gb.buffer, s->gb.buffer_end - s->gb.buffer) < 0)
- return -1;
+ if ((ret = avctx->hwaccel->start_frame(avctx, s->gb.buffer, s->gb.buffer_end - s->gb.buffer)) < 0)
+ return ret;
}
ff_er_frame_start(s);
s->error_status_table[s->mb_num-1]= ER_MB_ERROR;
}
- assert(s->bitstream_buffer_size==0);
+ av_assert1(s->bitstream_buffer_size==0);
frame_end:
/* divx 5.01+ bistream reorder stuff */
if(s->codec_id==AV_CODEC_ID_MPEG4 && s->divx_packed){
- int current_pos= get_bits_count(&s->gb)>>3;
+ 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 > 5){
+ if(buf_size - current_pos > 7){
int i;
- for(i=current_pos; i<buf_size-3; 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=1;
+ startcode_found=!(buf[i+4]&0x40);
break;
}
}
}
- if(s->gb.buffer == s->bitstream_buffer && buf_size>7 && s->xvid_build>=0){ //xvid style
- startcode_found=1;
- current_pos=0;
- }
if(startcode_found){
av_fast_malloc(
ff_er_frame_end(s);
if (avctx->hwaccel) {
- if (avctx->hwaccel->end_frame(avctx) < 0)
- return -1;
+ if ((ret = avctx->hwaccel->end_frame(avctx)) < 0)
+ return ret;
}
ff_MPV_frame_end(s);
.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_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_hwaccel_pixfmt_list_420,
};
projects / ffmpeg / blobdiff