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Fix channel order for some MLP samples.

This commit is contained in:
Carl Eugen Hoyos 2011-04-14 03:14:05 +02:00
parent 19de9d5646
commit 939a12e25d
1 changed files with 18 additions and 0 deletions
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18
libavcodec/mlpdec.c
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@ -133,6 +133,9 @@ typedef struct MLPDecodeContext {
//! Index of the last substream to decode - further substreams are skipped.
uint8_t max_decoded_substream;
//! Stream needs channel reordering to comply with FFmpeg's channel order
uint8_t needs_reordering;
//! number of PCM samples contained in each frame
int access_unit_size;
//! next power of two above the number of samples in each frame
@ -326,6 +329,8 @@ static int read_major_sync(MLPDecodeContext *m, GetBitContext *gb)
for (substr = 0; substr < MAX_SUBSTREAMS; substr++)
m->substream[substr].restart_seen = 0;
m->needs_reordering = mh.channels_mlp >= 18 && mh.channels_mlp <= 20;
return 0;
}
@ -436,6 +441,19 @@ static int read_restart_header(MLPDecodeContext *m, GetBitContext *gbp,
s->ch_assign[ch_assign] = ch;
}
if (m->avctx->codec_id == CODEC_ID_MLP && m->needs_reordering) {
if (m->avctx->channel_layout == (AV_CH_LAYOUT_2_2|AV_CH_LOW_FREQUENCY) ||
m->avctx->channel_layout == AV_CH_LAYOUT_5POINT0) {
int i = s->ch_assign[4];
s->ch_assign[4] = s->ch_assign[3];
s->ch_assign[3] = s->ch_assign[2];
s->ch_assign[2] = i;
} else if (m->avctx->channel_layout == AV_CH_LAYOUT_5POINT1) {
FFSWAP(int, s->ch_assign[2], s->ch_assign[4]);
FFSWAP(int, s->ch_assign[3], s->ch_assign[5]);
}
}
checksum = ff_mlp_restart_checksum(buf, get_bits_count(gbp) - start_count);
if (checksum != get_bits(gbp, 8))