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author | Martijn van Beurden <mvanb1@gmail.com> | 2022-06-11 09:31:12 +0200 |
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committer | Paul B Mahol <onemda@gmail.com> | 2022-07-05 14:11:20 +0200 |
commit | 056a9fac5b8fef3b9f5abeb5bf581a3e52e28a37 (patch) | |
tree | 88fc80727b21b15c9f8d7c09a59913b39380d848 /libavformat/cafdec.c | |
parent | aa8905a1b13c6ac206d532afbad953dc71319247 (diff) | |
download | ffmpeg-056a9fac5b8fef3b9f5abeb5bf581a3e52e28a37.tar.gz |
avformat/cafdec: Implement FLAC-in-CAF parsing
The afconvert utility shipped with MacOS supports muxing of FLAC
in CAF, see afconvert help output on a recent Mac here:
https://hydrogenaud.io/index.php?topic=122509.0 A file created
with afconvert free of copyright (licensed CC0) can be found here:
http://www.audiograaf.nl/misc_stuff/afconvert-FLAC-in-CAF.caf
Diffstat (limited to 'libavformat/cafdec.c')
-rw-r--r-- | libavformat/cafdec.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/libavformat/cafdec.c b/libavformat/cafdec.c index 168f69f20b..d5b8c38c25 100644 --- a/libavformat/cafdec.c +++ b/libavformat/cafdec.c @@ -32,6 +32,7 @@ #include "internal.h" #include "isom.h" #include "mov_chan.h" +#include "libavcodec/flac.h" #include "libavutil/intreadwrite.h" #include "libavutil/intfloat.h" #include "libavutil/dict.h" @@ -170,6 +171,49 @@ static int read_kuki_chunk(AVFormatContext *s, int64_t size) } avio_skip(pb, size - ALAC_NEW_KUKI); } + } else if (st->codecpar->codec_id == AV_CODEC_ID_FLAC) { + int last, type, flac_metadata_size; + uint8_t buf[4]; + /* The magic cookie format for FLAC consists mostly of an mp4 dfLa atom. */ + if (size < (16 + FLAC_STREAMINFO_SIZE)) { + av_log(s, AV_LOG_ERROR, "invalid FLAC magic cookie\n"); + return AVERROR_INVALIDDATA; + } + /* Check cookie version. */ + if (avio_r8(pb) != 0) { + av_log(s, AV_LOG_ERROR, "unknown FLAC magic cookie\n"); + return AVERROR_INVALIDDATA; + } + avio_rb24(pb); /* Flags */ + /* read dfLa fourcc */ + if (avio_read(pb, buf, 4) != 4) { + av_log(s, AV_LOG_ERROR, "failed to read FLAC magic cookie\n"); + return pb->error < 0 ? pb->error : AVERROR_INVALIDDATA; + } + if (memcmp(buf, "dfLa", 4)) { + av_log(s, AV_LOG_ERROR, "invalid FLAC magic cookie\n"); + return AVERROR_INVALIDDATA; + } + /* Check dfLa version. */ + if (avio_r8(pb) != 0) { + av_log(s, AV_LOG_ERROR, "unknown dfLa version\n"); + return AVERROR_INVALIDDATA; + } + avio_rb24(pb); /* Flags */ + if (avio_read(pb, buf, sizeof(buf)) != sizeof(buf)) { + av_log(s, AV_LOG_ERROR, "failed to read FLAC metadata block header\n"); + return pb->error < 0 ? pb->error : AVERROR_INVALIDDATA; + } + flac_parse_block_header(buf, &last, &type, &flac_metadata_size); + if (type != FLAC_METADATA_TYPE_STREAMINFO || flac_metadata_size != FLAC_STREAMINFO_SIZE) { + av_log(s, AV_LOG_ERROR, "STREAMINFO must be first FLACMetadataBlock\n"); + return AVERROR_INVALIDDATA; + } + ret = ff_get_extradata(s, st->codecpar, pb, FLAC_STREAMINFO_SIZE); + if (ret < 0) + return ret; + if (!last) + av_log(s, AV_LOG_WARNING, "non-STREAMINFO FLACMetadataBlock(s) ignored\n"); } else if (st->codecpar->codec_id == AV_CODEC_ID_OPUS) { // The data layout for Opus is currently unknown, so we do not export // extradata at all. Multichannel streams are not supported. |