From 2288834f8766fb268e0f6d72e0b3627ff2dadce3 Mon Sep 17 00:00:00 2001 From: Baptiste Coudurier Date: Sun, 3 Aug 2008 18:37:35 +0000 Subject: [PATCH] full lpcm support in mov audio stsd v2 Originally committed as revision 14524 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavformat/mov.c | 39 +++++++++++++++++++++++++++++++++++++-- 1 file changed, 37 insertions(+), 2 deletions(-) diff --git a/libavformat/mov.c b/libavformat/mov.c index 74c7a7ceef..252e7af585 100644 --- a/libavformat/mov.c +++ b/libavformat/mov.c @@ -665,6 +665,41 @@ static int mov_read_stco(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom) return 0; } +/** + * Compute codec id for 'lpcm' tag. + * See CoreAudioTypes and AudioStreamBasicDescription at Apple. + */ +static int mov_get_lpcm_codec_id(int bps, int flags) +{ + if (flags & 1) { // floating point + if (flags & 2) { // big endian + if (bps == 32) return CODEC_ID_PCM_F32BE; + //else if (bps == 64) return CODEC_ID_PCM_F64BE; + } else { + //if (bps == 32) return CODEC_ID_PCM_F32LE; + //else if (bps == 64) return CODEC_ID_PCM_F64LE; + } + } else { + if (flags & 2) { + if (bps == 8) + // signed integer + if (flags & 4) return CODEC_ID_PCM_S8; + else return CODEC_ID_PCM_U8; + else if (bps == 16) return CODEC_ID_PCM_S16BE; + else if (bps == 24) return CODEC_ID_PCM_S24BE; + else if (bps == 32) return CODEC_ID_PCM_S32BE; + } else { + if (bps == 8) + if (flags & 4) return CODEC_ID_PCM_S8; + else return CODEC_ID_PCM_U8; + if (bps == 16) return CODEC_ID_PCM_S16LE; + else if (bps == 24) return CODEC_ID_PCM_S24LE; + else if (bps == 32) return CODEC_ID_PCM_S32LE; + } + } + return 0; +} + static int mov_read_stsd(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom) { AVStream *st = c->fc->streams[c->fc->nb_streams-1]; @@ -865,8 +900,8 @@ static int mov_read_stsd(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom) flags = get_be32(pb); /* lcpm format specific flag */ sc->bytes_per_frame = get_be32(pb); /* bytes per audio packet if constant */ sc->samples_per_frame = get_be32(pb); /* lpcm frames per audio packet if constant */ - if (flags & 2) // big endian - st->codec->codec_id = CODEC_ID_PCM_S16BE; + if (format == MKTAG('l','p','c','m')) + st->codec->codec_id = mov_get_lpcm_codec_id(st->codec->bits_per_sample, flags); } }