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Make rv1/2 decoder use the next slice if needed. 

Fixes issue782.

Originally committed as revision 20690 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2009-12-01 21:10:37 +00:00
parent 66765b5933
commit e7e578b73c
1 changed files with 16 additions and 4 deletions
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20
libavcodec/rv10.c
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@ -520,7 +520,7 @@ static av_cold int rv10_decode_end(AVCodecContext *avctx)
}
static int rv10_decode_packet(AVCodecContext *avctx,
const uint8_t *buf, int buf_size)
const uint8_t *buf, int buf_size, int buf_size2)
{
MpegEncContext *s = avctx->priv_data;
int mb_count, mb_pos, left, start_mb_x;
@ -603,6 +603,12 @@ static int rv10_decode_packet(AVCodecContext *avctx,
s->mv_type = MV_TYPE_16X16;
ret=ff_h263_decode_mb(s, s->block);
if (ret != SLICE_ERROR && s->gb.size_in_bits < get_bits_count(&s->gb) && 8*buf_size2 >= get_bits_count(&s->gb)){
av_log(avctx, AV_LOG_DEBUG, "update size from %d to %d\n", s->gb.size_in_bits, 8*buf_size2);
s->gb.size_in_bits= 8*buf_size2;
ret= SLICE_OK;
}
if (ret == SLICE_ERROR || s->gb.size_in_bits < get_bits_count(&s->gb)) {
av_log(s->avctx, AV_LOG_ERROR, "ERROR at MB %d %d\n", s->mb_x, s->mb_y);
return -1;
@ -625,7 +631,7 @@ static int rv10_decode_packet(AVCodecContext *avctx,
ff_er_add_slice(s, start_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, AC_END|DC_END|MV_END);
return buf_size;
return s->gb.size_in_bits;
}
static int get_slice_offset(AVCodecContext *avctx, const uint8_t *buf, int n)
@ -662,14 +668,20 @@ static int rv10_decode_frame(AVCodecContext *avctx,
for(i=0; i<slice_count; i++){
int offset= get_slice_offset(avctx, slices_hdr, i);
int size;
int size, size2;
if(i+1 == slice_count)
size= buf_size - offset;
else
size= get_slice_offset(avctx, slices_hdr, i+1) - offset;
rv10_decode_packet(avctx, buf+offset, size);
if(i+2 >= slice_count)
size2= buf_size - offset;
else
size2= get_slice_offset(avctx, slices_hdr, i+2) - offset;
if(rv10_decode_packet(avctx, buf+offset, size, size2) > 8*size)
i++;
}
if(s->current_picture_ptr != NULL && s->mb_y>=s->mb_height){