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/*
* Core Audio Format muxer
* Copyright (c) 2011 Carl Eugen Hoyos
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "avformat.h"
#include "caf.h"
#include "riff.h"
#include "isom.h"
#include "avio_internal.h"
#include "libavutil/intfloat_readwrite.h"
typedef struct {
int64_t data;
} CAFContext;
static uint32_t codec_flags(enum CodecID codec_id) {
switch (codec_id) {
case CODEC_ID_PCM_F32BE:
case CODEC_ID_PCM_F64BE:
return 1; //< kCAFLinearPCMFormatFlagIsFloat
case CODEC_ID_PCM_S16LE:
case CODEC_ID_PCM_S24LE:
case CODEC_ID_PCM_S32LE:
return 2; //< kCAFLinearPCMFormatFlagIsLittleEndian
case CODEC_ID_PCM_F32LE:
case CODEC_ID_PCM_F64LE:
return 3; //< kCAFLinearPCMFormatFlagIsFloat | kCAFLinearPCMFormatFlagIsLittleEndian
default:
return 0;
}
}
static uint32_t samples_per_packet(enum CodecID codec_id, int channels) {
switch (codec_id) {
case CODEC_ID_PCM_S8:
case CODEC_ID_PCM_S16LE:
case CODEC_ID_PCM_S16BE:
case CODEC_ID_PCM_S24LE:
case CODEC_ID_PCM_S24BE:
case CODEC_ID_PCM_S32LE:
case CODEC_ID_PCM_S32BE:
case CODEC_ID_PCM_F32LE:
case CODEC_ID_PCM_F32BE:
case CODEC_ID_PCM_F64LE:
case CODEC_ID_PCM_F64BE:
case CODEC_ID_PCM_ALAW:
case CODEC_ID_PCM_MULAW:
return 1;
case CODEC_ID_MACE3:
case CODEC_ID_MACE6:
return 6;
case CODEC_ID_ADPCM_IMA_QT:
return 64;
case CODEC_ID_AMR_NB:
case CODEC_ID_GSM:
case CODEC_ID_QCELP:
return 160;
case CODEC_ID_GSM_MS:
return 320;
case CODEC_ID_MP1:
return 384;
case CODEC_ID_MP2:
case CODEC_ID_MP3:
return 1152;
case CODEC_ID_AC3:
return 1536;
case CODEC_ID_ALAC:
case CODEC_ID_QDM2:
return 4096;
case CODEC_ID_ADPCM_IMA_WAV:
return (1024 - 4 * channels) * 8 / (4 * channels) + 1;
case CODEC_ID_ADPCM_MS:
return (1024 - 7 * channels) * 2 / channels + 2;
default:
return 0;
}
}
static int caf_write_header(AVFormatContext *s)
{
AVIOContext *pb = s->pb;
AVCodecContext *enc = s->streams[0]->codec;
CAFContext *caf = s->priv_data;
unsigned int codec_tag = ff_codec_get_tag(ff_codec_caf_tags, enc->codec_id);
switch (enc->codec_id) {
case CODEC_ID_PCM_S8:
case CODEC_ID_PCM_S16LE:
case CODEC_ID_PCM_S16BE:
case CODEC_ID_PCM_S24LE:
case CODEC_ID_PCM_S24BE:
case CODEC_ID_PCM_S32LE:
case CODEC_ID_PCM_S32BE:
case CODEC_ID_PCM_F32LE:
case CODEC_ID_PCM_F32BE:
case CODEC_ID_PCM_F64LE:
case CODEC_ID_PCM_F64BE:
case CODEC_ID_PCM_ALAW:
case CODEC_ID_PCM_MULAW:
codec_tag = MKBETAG('l','p','c','m');
}
if (!codec_tag) {
av_log(s, AV_LOG_ERROR, "unsupported codec\n");
return AVERROR_INVALIDDATA;
}
if (!enc->block_align) {
av_log(s, AV_LOG_ERROR, "muxing with unknown or variable packet size not yet supported\n");
return AVERROR_PATCHWELCOME;
}
ffio_wfourcc(pb, "caff"); //< mFileType
avio_wb16(pb, 1); //< mFileVersion
avio_wb16(pb, 0); //< mFileFlags
ffio_wfourcc(pb, "desc"); //< Audio Description chunk
avio_wb64(pb, 32); //< mChunkSize
avio_wb64(pb, av_dbl2int(enc->sample_rate)); //< mSampleRate
avio_wb32(pb, codec_tag); //< mFormatID
avio_wb32(pb, codec_flags(enc->codec_id)); //< mFormatFlags
avio_wb32(pb, enc->block_align); //< mBytesPerPacket
avio_wb32(pb, samples_per_packet(enc->codec_id, enc->channels)); //< mFramesPerPacket
avio_wb32(pb, enc->channels); //< mChannelsPerFrame
avio_wb32(pb, enc->bits_per_coded_sample); //< mBitsPerChannel
if (enc->channel_layout) {
ffio_wfourcc(pb, "chan");
avio_wb64(pb, 12);
ff_mov_write_chan(pb, enc->channel_layout);
}
ffio_wfourcc(pb, "data"); //< Audio Data chunk
caf->data = avio_tell(pb);
avio_wb64(pb, -1); //< mChunkSize
avio_wb32(pb, 0); //< mEditCount
avio_flush(pb);
return 0;
}
static int caf_write_packet(AVFormatContext *s, AVPacket *pkt)
{
avio_write(s->pb, pkt->data, pkt->size);
return 0;
}
static int caf_write_trailer(AVFormatContext *s)
{
AVIOContext *pb = s->pb;
if (pb->seekable) {
CAFContext *caf = s->priv_data;
int64_t file_size = avio_tell(pb);
avio_seek(pb, caf->data, SEEK_SET);
avio_wb64(pb, file_size - caf->data - 8);
avio_seek(pb, file_size, SEEK_SET);
avio_flush(pb);
}
return 0;
}
AVOutputFormat ff_caf_muxer = {
"caf",
NULL_IF_CONFIG_SMALL("Apple Core Audio Format"),
"audio/x-caf",
"caf",
sizeof(CAFContext),
CODEC_ID_PCM_S16BE,
CODEC_ID_NONE,
caf_write_header,
caf_write_packet,
caf_write_trailer,
.codec_tag= (const AVCodecTag* const []){ff_codec_caf_tags, 0},
};