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mlpdec: Cleaner and better termination word check. 

Originally committed as revision 18236 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Ramiro Polla 2009-03-30 03:34:15 +00:00
parent 125cf771f6
commit 7b18e13a7c
1 changed files with 12 additions and 11 deletions
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23
libavcodec/mlpdec.c
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@ -1021,19 +1021,20 @@ static int read_access_unit(AVCodecContext *avctx, void* data, int *data_size,
&& get_bits1(&gb) == 0);
skip_bits(&gb, (-get_bits_count(&gb)) & 15);
if (substream_data_len[substr] * 8 - get_bits_count(&gb) >= 32 &&
(show_bits_long(&gb, 32) == END_OF_STREAM ||
show_bits_long(&gb, 20) == 0xd234e)) {
skip_bits(&gb, 18);
if (substream_data_len[substr] * 8 - get_bits_count(&gb) >= 32) {
int shorten_by;
if (get_bits(&gb, 16) != 0xD234)
return -1;
shorten_by = get_bits(&gb, 16);
if (m->avctx->codec_id == CODEC_ID_TRUEHD && shorten_by & 0x2000)
s->blockpos -= FFMIN(shorten_by & 0x1FFF, s->blockpos);
else if (m->avctx->codec_id == CODEC_ID_MLP && shorten_by != 0xD234)
return -1;
if (substr == m->max_decoded_substream)
av_log(m->avctx, AV_LOG_INFO, "End of stream indicated.\n");
if (get_bits1(&gb)) {
int shorten_by = get_bits(&gb, 13);
shorten_by = FFMIN(shorten_by, s->blockpos);
s->blockpos -= shorten_by;
} else
skip_bits(&gb, 13);
}
if (substream_data_len[substr] * 8 - get_bits_count(&gb) >= 16 &&
substream_parity_present[substr]) {