videolan/ffmpeg
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fix multiple slices per frame

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Originally committed as revision 17137 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Stefan Gehrer 2009-02-10 20:51:35 +00:00
parent 4ca6f4b29c
commit b9fce05205
2 changed files with 11 additions and 3 deletions
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2
libavcodec/cavs.c
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@ -608,8 +608,6 @@ int ff_cavs_next_mb(AVSContext *h) {
h->cv = h->picture.data[2] + h->mby*8*h->c_stride;
if(h->mby == h->mb_height) { //frame end
return 0;
} else {
//check_for_slice(h);
}
}
return 1;

12
libavcodec/cavsdec.c
View File

@ -415,6 +415,9 @@ static inline int decode_slice_header(AVSContext *h, GetBitContext *gb) {
if(h->stc > 0xAF)
av_log(h->s.avctx, AV_LOG_ERROR, "unexpected start code 0x%02x\n", h->stc);
h->mby = h->stc;
/* mark top macroblocks as unavailable */
h->flags &= ~(B_AVAIL|C_AVAIL);
if((h->mby == 0) && (!h->qp_fixed)){
h->qp_fixed = get_bits1(gb);
h->qp = get_bits(gb,6);
@ -431,6 +434,9 @@ static inline int decode_slice_header(AVSContext *h, GetBitContext *gb) {
static inline void check_for_slice(AVSContext *h) {
GetBitContext *gb = &h->s.gb;
int align;
if(h->mbx)
return;
align = (-get_bits_count(gb)) & 7;
if((show_bits_long(gb,24+align) & 0xFFFFFF) == 0x000001) {
skip_bits_long(gb,24+align);
@ -525,13 +531,14 @@ static int decode_pic(AVSContext *h) {
} else {
h->alpha_offset = h->beta_offset = 0;
}
check_for_slice(h);
if(h->pic_type == FF_I_TYPE) {
do {
check_for_slice(h);
decode_mb_i(h, 0);
} while(ff_cavs_next_mb(h));
} else if(h->pic_type == FF_P_TYPE) {
do {
check_for_slice(h);
if(h->skip_mode_flag) {
skip_count = get_ue_golomb(&s->gb);
while(skip_count--) {
@ -539,6 +546,7 @@ static int decode_pic(AVSContext *h) {
if(!ff_cavs_next_mb(h))
goto done;
}
check_for_slice(h);
mb_type = get_ue_golomb(&s->gb) + P_16X16;
} else
mb_type = get_ue_golomb(&s->gb) + P_SKIP;
@ -549,6 +557,7 @@ static int decode_pic(AVSContext *h) {
} while(ff_cavs_next_mb(h));
} else { /* FF_B_TYPE */
do {
check_for_slice(h);
if(h->skip_mode_flag) {
skip_count = get_ue_golomb(&s->gb);
while(skip_count--) {
@ -556,6 +565,7 @@ static int decode_pic(AVSContext *h) {
if(!ff_cavs_next_mb(h))
goto done;
}
check_for_slice(h);
mb_type = get_ue_golomb(&s->gb) + B_DIRECT;
} else
mb_type = get_ue_golomb(&s->gb) + B_SKIP;