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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
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@ -46,6 +46,7 @@ const AVCodecTag ff_codec_caf_tags[] = {
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{ AV_CODEC_ID_GSM, MKTAG('a','g','s','m') },
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{ AV_CODEC_ID_GSM, MKTAG('a','g','s','m') },
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{ AV_CODEC_ID_GSM_MS, MKTAG('m','s', 0, '1') },
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{ AV_CODEC_ID_GSM_MS, MKTAG('m','s', 0, '1') },
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{ AV_CODEC_ID_ILBC, MKTAG('i','l','b','c') },
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{ AV_CODEC_ID_ILBC, MKTAG('i','l','b','c') },
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{ AV_CODEC_ID_FLAC, MKTAG('f','l','a','c') },
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{ AV_CODEC_ID_MACE3, MKTAG('M','A','C','3') },
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{ AV_CODEC_ID_MACE3, MKTAG('M','A','C','3') },
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{ AV_CODEC_ID_MACE6, MKTAG('M','A','C','6') },
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{ AV_CODEC_ID_MACE6, MKTAG('M','A','C','6') },
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{ AV_CODEC_ID_MP1, MKTAG('.','m','p','1') },
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{ AV_CODEC_ID_MP1, MKTAG('.','m','p','1') },
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@ -32,6 +32,7 @@
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#include "internal.h"
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#include "internal.h"
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#include "isom.h"
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#include "isom.h"
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#include "mov_chan.h"
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#include "mov_chan.h"
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#include "libavcodec/flac.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/intfloat.h"
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#include "libavutil/intfloat.h"
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#include "libavutil/dict.h"
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#include "libavutil/dict.h"
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@ -170,6 +171,49 @@ static int read_kuki_chunk(AVFormatContext *s, int64_t size)
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}
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}
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avio_skip(pb, size - ALAC_NEW_KUKI);
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avio_skip(pb, size - ALAC_NEW_KUKI);
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}
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}
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} else if (st->codecpar->codec_id == AV_CODEC_ID_FLAC) {
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int last, type, flac_metadata_size;
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uint8_t buf[4];
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/* The magic cookie format for FLAC consists mostly of an mp4 dfLa atom. */
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if (size < (16 + FLAC_STREAMINFO_SIZE)) {
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av_log(s, AV_LOG_ERROR, "invalid FLAC magic cookie\n");
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return AVERROR_INVALIDDATA;
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}
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/* Check cookie version. */
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if (avio_r8(pb) != 0) {
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av_log(s, AV_LOG_ERROR, "unknown FLAC magic cookie\n");
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return AVERROR_INVALIDDATA;
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}
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avio_rb24(pb); /* Flags */
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/* read dfLa fourcc */
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if (avio_read(pb, buf, 4) != 4) {
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av_log(s, AV_LOG_ERROR, "failed to read FLAC magic cookie\n");
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return pb->error < 0 ? pb->error : AVERROR_INVALIDDATA;
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}
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if (memcmp(buf, "dfLa", 4)) {
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av_log(s, AV_LOG_ERROR, "invalid FLAC magic cookie\n");
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return AVERROR_INVALIDDATA;
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}
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/* Check dfLa version. */
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if (avio_r8(pb) != 0) {
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av_log(s, AV_LOG_ERROR, "unknown dfLa version\n");
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return AVERROR_INVALIDDATA;
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}
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avio_rb24(pb); /* Flags */
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if (avio_read(pb, buf, sizeof(buf)) != sizeof(buf)) {
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av_log(s, AV_LOG_ERROR, "failed to read FLAC metadata block header\n");
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return pb->error < 0 ? pb->error : AVERROR_INVALIDDATA;
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}
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flac_parse_block_header(buf, &last, &type, &flac_metadata_size);
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if (type != FLAC_METADATA_TYPE_STREAMINFO || flac_metadata_size != FLAC_STREAMINFO_SIZE) {
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av_log(s, AV_LOG_ERROR, "STREAMINFO must be first FLACMetadataBlock\n");
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return AVERROR_INVALIDDATA;
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}
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ret = ff_get_extradata(s, st->codecpar, pb, FLAC_STREAMINFO_SIZE);
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if (ret < 0)
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return ret;
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if (!last)
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av_log(s, AV_LOG_WARNING, "non-STREAMINFO FLACMetadataBlock(s) ignored\n");
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} else if (st->codecpar->codec_id == AV_CODEC_ID_OPUS) {
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} else if (st->codecpar->codec_id == AV_CODEC_ID_OPUS) {
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// The data layout for Opus is currently unknown, so we do not export
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// The data layout for Opus is currently unknown, so we do not export
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// extradata at all. Multichannel streams are not supported.
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// extradata at all. Multichannel streams are not supported.
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