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make the h263 decoder more error tolerant

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Originally committed as revision 2099 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2003-08-01 11:00:03 +00:00
parent e7d0374f27
commit ffba1dc02b
3 changed files with 23 additions and 16 deletions
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9
libavcodec/h263.c
View File

@ -2500,6 +2500,8 @@ static int h263_decode_gob_header(MpegEncContext *s)
return -1;
s->mb_x= 0;
s->mb_y= s->gob_index* s->gob_number;
if(s->mb_y >= s->mb_height)
return -1;
#ifdef DEBUG
fprintf(stderr, "\nGN: %u GFID: %u Quant: %u\n", s->gob_number, gfid, s->qscale);
#endif
@ -4069,7 +4071,7 @@ int h263_decode_picture_header(MpegEncContext *s)
startcode= get_bits(&s->gb, 22-8);
for(i= s->gb.size_in_bits - get_bits_count(&s->gb); i>0; i--) {
for(i= s->gb.size_in_bits - get_bits_count(&s->gb); i>24; i-=8) {
startcode = ((startcode << 8) | get_bits(&s->gb, 8)) & 0x003FFFFF;
if(startcode == 0x20)
@ -4116,8 +4118,6 @@ int h263_decode_picture_header(MpegEncContext *s)
if (!width)
return -1;
s->width = width;
s->height = height;
s->pict_type = I_TYPE + get_bits1(&s->gb);
s->unrestricted_mv = get_bits1(&s->gb);
@ -4137,6 +4137,9 @@ int h263_decode_picture_header(MpegEncContext *s)
}
s->qscale = get_bits(&s->gb, 5);
skip_bits1(&s->gb); /* Continuous Presence Multipoint mode: off */
s->width = width;
s->height = height;
} else {
int ufep;

16
libavcodec/h263dec.c
View File

@ -470,6 +470,15 @@ retry:
} else {
ret = h263_decode_picture_header(s);
}
if(ret==FRAME_SKIPED) return get_consumed_bytes(s, buf_size);
/* skip if the header was thrashed */
if (ret < 0){
fprintf(stderr, "header damaged\n");
return -1;
}
avctx->has_b_frames= !s->low_delay;
if(s->workaround_bugs&FF_BUG_AUTODETECT){
@ -604,13 +613,6 @@ retry:
if((s->codec_id==CODEC_ID_H263 || s->codec_id==CODEC_ID_H263P))
s->gob_index = ff_h263_get_gob_height(s);
if(ret==FRAME_SKIPED) return get_consumed_bytes(s, buf_size);
/* skip if the header was thrashed */
if (ret < 0){
fprintf(stderr, "header damaged\n");
return -1;
}
// for hurry_up==5
s->current_picture.pict_type= s->pict_type;

14
libavcodec/mpegvideo.c
View File

@ -1004,6 +1004,14 @@ alloc:
if(s->next_picture_ptr) s->next_picture= *s->next_picture_ptr;
if(s->new_picture_ptr ) s->new_picture = *s->new_picture_ptr;
if(s->pict_type != I_TYPE && s->last_picture_ptr==NULL){
fprintf(stderr, "warning: first frame is no keyframe\n");
assert(s->pict_type != B_TYPE); //these should have been dropped if we dont have a reference
goto alloc;
}
assert(s->pict_type == I_TYPE || (s->last_picture_ptr && s->last_picture_ptr->data[0]));
if(s->picture_structure!=PICT_FRAME){
int i;
for(i=0; i<4; i++){
@ -1015,12 +1023,6 @@ alloc:
s->next_picture.linesize[i] *=2;
}
}
if(s->pict_type != I_TYPE && s->last_picture_ptr==NULL){
fprintf(stderr, "warning: first frame is no keyframe\n");
assert(s->pict_type != B_TYPE); //these should have been dropped if we dont have a reference
goto alloc;
}
}
s->hurry_up= s->avctx->hurry_up;