static void vc1_extract_headers(AVCodecParserContext *s, AVCodecContext *avctx,
const uint8_t *buf, int buf_size)
{
VC1ParseContext *vpc = s->priv_data;
GetBitContext gb;
const uint8_t *start, *end, *next;
uint8_t *buf2 = av_mallocz(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
vpc->v.s.avctx = avctx;
vpc->v.parse_only = 1;
next = buf;
s->repeat_pict = 0;
for(start = buf, end = buf + buf_size; next < end; start = next){
int buf2_size, size;
next = find_next_marker(start + 4, end);
size = next - start - 4;
buf2_size = vc1_unescape_buffer(start + 4, size, buf2);
init_get_bits(&gb, buf2, buf2_size * 8);
if(size <= 0) continue;
switch(AV_RB32(start)){
case VC1_CODE_SEQHDR:
ff_vc1_decode_sequence_header(avctx, &vpc->v, &gb);
break;
case VC1_CODE_ENTRYPOINT:
ff_vc1_decode_entry_point(avctx, &vpc->v, &gb);
break;
case VC1_CODE_FRAME:
if(vpc->v.profile < PROFILE_ADVANCED)
ff_vc1_parse_frame_header (&vpc->v, &gb);
else
ff_vc1_parse_frame_header_adv(&vpc->v, &gb);
/* keep AV_PICTURE_TYPE_BI internal to VC1 */
if (vpc->v.s.pict_type == AV_PICTURE_TYPE_BI)
s->pict_type = AV_PICTURE_TYPE_B;
else
s->pict_type = vpc->v.s.pict_type;
if (avctx->ticks_per_frame > 1){
// process pulldown flags
s->repeat_pict = 1;
// Pulldown flags are only valid when 'broadcast' has been set.
// So ticks_per_frame will be 2
if (vpc->v.rff){
// repeat field
s->repeat_pict = 2;
}else if (vpc->v.rptfrm){
// repeat frames
s->repeat_pict = vpc->v.rptfrm * 2 + 1;
}
}
break;
}
}
av_free(buf2);
}
static void vc1_extract_header(AVCodecParserContext *s, AVCodecContext *avctx,
const uint8_t *buf, int buf_size)
{
/* Parse the header we just finished unescaping */
VC1ParseContext *vpc = s->priv_data;
GetBitContext gb;
int ret;
vpc->v.s.avctx = avctx;
vpc->v.parse_only = 1;
init_get_bits(&gb, buf, buf_size * 8);
switch (vpc->prev_start_code) {
case VC1_CODE_SEQHDR & 0xFF:
ff_vc1_decode_sequence_header(avctx, &vpc->v, &gb);
break;
case VC1_CODE_ENTRYPOINT & 0xFF:
ff_vc1_decode_entry_point(avctx, &vpc->v, &gb);
break;
case VC1_CODE_FRAME & 0xFF:
if(vpc->v.profile < PROFILE_ADVANCED)
ret = ff_vc1_parse_frame_header (&vpc->v, &gb);
else
ret = ff_vc1_parse_frame_header_adv(&vpc->v, &gb);
if (ret < 0)
break;
/* keep AV_PICTURE_TYPE_BI internal to VC1 */
if (vpc->v.s.pict_type == AV_PICTURE_TYPE_BI)
s->pict_type = AV_PICTURE_TYPE_B;
else
s->pict_type = vpc->v.s.pict_type;
if (avctx->ticks_per_frame > 1){
// process pulldown flags
s->repeat_pict = 1;
// Pulldown flags are only valid when 'broadcast' has been set.
// So ticks_per_frame will be 2
if (vpc->v.rff){
// repeat field
s->repeat_pict = 2;
}else if (vpc->v.rptfrm){
// repeat frames
s->repeat_pict = vpc->v.rptfrm * 2 + 1;
}
}else{
s->repeat_pict = 0;
}
if (vpc->v.broadcast && vpc->v.interlace && !vpc->v.psf)
s->field_order = vpc->v.tff ? AV_FIELD_TT : AV_FIELD_BB;
else
s->field_order = AV_FIELD_PROGRESSIVE;
break;
}
}
