0,0 → 1,286 |
/* |
* 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 "isom.h" |
#include "avio_internal.h" |
#include "libavutil/intfloat.h" |
#include "libavutil/dict.h" |
|
typedef struct { |
int64_t data; |
uint8_t *pkt_sizes; |
int size_buffer_size; |
int size_entries_used; |
int packets; |
} CAFContext; |
|
static uint32_t codec_flags(enum AVCodecID codec_id) { |
switch (codec_id) { |
case AV_CODEC_ID_PCM_F32BE: |
case AV_CODEC_ID_PCM_F64BE: |
return 1; //< kCAFLinearPCMFormatFlagIsFloat |
case AV_CODEC_ID_PCM_S16LE: |
case AV_CODEC_ID_PCM_S24LE: |
case AV_CODEC_ID_PCM_S32LE: |
return 2; //< kCAFLinearPCMFormatFlagIsLittleEndian |
case AV_CODEC_ID_PCM_F32LE: |
case AV_CODEC_ID_PCM_F64LE: |
return 3; //< kCAFLinearPCMFormatFlagIsFloat | kCAFLinearPCMFormatFlagIsLittleEndian |
default: |
return 0; |
} |
} |
|
static uint32_t samples_per_packet(enum AVCodecID codec_id, int channels, int block_align) { |
switch (codec_id) { |
case AV_CODEC_ID_PCM_S8: |
case AV_CODEC_ID_PCM_S16LE: |
case AV_CODEC_ID_PCM_S16BE: |
case AV_CODEC_ID_PCM_S24LE: |
case AV_CODEC_ID_PCM_S24BE: |
case AV_CODEC_ID_PCM_S32LE: |
case AV_CODEC_ID_PCM_S32BE: |
case AV_CODEC_ID_PCM_F32LE: |
case AV_CODEC_ID_PCM_F32BE: |
case AV_CODEC_ID_PCM_F64LE: |
case AV_CODEC_ID_PCM_F64BE: |
case AV_CODEC_ID_PCM_ALAW: |
case AV_CODEC_ID_PCM_MULAW: |
return 1; |
case AV_CODEC_ID_MACE3: |
case AV_CODEC_ID_MACE6: |
return 6; |
case AV_CODEC_ID_ADPCM_IMA_QT: |
return 64; |
case AV_CODEC_ID_AMR_NB: |
case AV_CODEC_ID_GSM: |
case AV_CODEC_ID_ILBC: |
case AV_CODEC_ID_QCELP: |
return 160; |
case AV_CODEC_ID_GSM_MS: |
return 320; |
case AV_CODEC_ID_MP1: |
return 384; |
case AV_CODEC_ID_MP2: |
case AV_CODEC_ID_MP3: |
return 1152; |
case AV_CODEC_ID_AC3: |
return 1536; |
case AV_CODEC_ID_QDM2: |
return 2048 * channels; |
case AV_CODEC_ID_ALAC: |
return 4096; |
case AV_CODEC_ID_ADPCM_IMA_WAV: |
return (block_align - 4 * channels) * 8 / (4 * channels) + 1; |
case AV_CODEC_ID_ADPCM_MS: |
return (block_align - 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; |
AVDictionaryEntry *t = NULL; |
unsigned int codec_tag = ff_codec_get_tag(ff_codec_caf_tags, enc->codec_id); |
int64_t chunk_size = 0; |
int frame_size = enc->frame_size; |
|
if (s->nb_streams != 1) { |
av_log(s, AV_LOG_ERROR, "CAF files have exactly one stream\n"); |
return AVERROR(EINVAL); |
} |
|
switch (enc->codec_id) { |
case AV_CODEC_ID_AAC: |
av_log(s, AV_LOG_ERROR, "muxing codec currently unsupported\n"); |
return AVERROR_PATCHWELCOME; |
} |
|
switch (enc->codec_id) { |
case AV_CODEC_ID_PCM_S8: |
case AV_CODEC_ID_PCM_S16LE: |
case AV_CODEC_ID_PCM_S16BE: |
case AV_CODEC_ID_PCM_S24LE: |
case AV_CODEC_ID_PCM_S24BE: |
case AV_CODEC_ID_PCM_S32LE: |
case AV_CODEC_ID_PCM_S32BE: |
case AV_CODEC_ID_PCM_F32LE: |
case AV_CODEC_ID_PCM_F32BE: |
case AV_CODEC_ID_PCM_F64LE: |
case AV_CODEC_ID_PCM_F64BE: |
codec_tag = MKTAG('l','p','c','m'); |
} |
|
if (!codec_tag) { |
av_log(s, AV_LOG_ERROR, "unsupported codec\n"); |
return AVERROR_INVALIDDATA; |
} |
|
if (!enc->block_align && !pb->seekable) { |
av_log(s, AV_LOG_ERROR, "Muxing variable packet size not supported on non seekable output\n"); |
return AVERROR_INVALIDDATA; |
} |
|
if (enc->codec_id != AV_CODEC_ID_MP3 || frame_size != 576) |
frame_size = samples_per_packet(enc->codec_id, enc->channels, enc->block_align); |
|
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_double2int(enc->sample_rate)); //< mSampleRate |
avio_wl32(pb, codec_tag); //< mFormatID |
avio_wb32(pb, codec_flags(enc->codec_id)); //< mFormatFlags |
avio_wb32(pb, enc->block_align); //< mBytesPerPacket |
avio_wb32(pb, frame_size); //< mFramesPerPacket |
avio_wb32(pb, enc->channels); //< mChannelsPerFrame |
avio_wb32(pb, av_get_bits_per_sample(enc->codec_id)); //< mBitsPerChannel |
|
if (enc->channel_layout) { |
ffio_wfourcc(pb, "chan"); |
avio_wb64(pb, 12); |
ff_mov_write_chan(pb, enc->channel_layout); |
} |
|
if (enc->codec_id == AV_CODEC_ID_ALAC) { |
ffio_wfourcc(pb, "kuki"); |
avio_wb64(pb, 12 + enc->extradata_size); |
avio_write(pb, "\0\0\0\14frmaalac", 12); |
avio_write(pb, enc->extradata, enc->extradata_size); |
} else if (enc->codec_id == AV_CODEC_ID_AMR_NB) { |
ffio_wfourcc(pb, "kuki"); |
avio_wb64(pb, 29); |
avio_write(pb, "\0\0\0\14frmasamr", 12); |
avio_wb32(pb, 0x11); /* size */ |
avio_write(pb, "samrFFMP", 8); |
avio_w8(pb, 0); /* decoder version */ |
|
avio_wb16(pb, 0x81FF); /* Mode set (all modes for AMR_NB) */ |
avio_w8(pb, 0x00); /* Mode change period (no restriction) */ |
avio_w8(pb, 0x01); /* Frames per sample */ |
} else if (enc->codec_id == AV_CODEC_ID_QDM2) { |
ffio_wfourcc(pb, "kuki"); |
avio_wb64(pb, enc->extradata_size); |
avio_write(pb, enc->extradata, enc->extradata_size); |
} |
|
if (av_dict_count(s->metadata)) { |
ffio_wfourcc(pb, "info"); //< Information chunk |
while ((t = av_dict_get(s->metadata, "", t, AV_DICT_IGNORE_SUFFIX))) { |
chunk_size += strlen(t->key) + strlen(t->value) + 2; |
} |
avio_wb64(pb, chunk_size + 4); |
avio_wb32(pb, av_dict_count(s->metadata)); |
t = NULL; |
while ((t = av_dict_get(s->metadata, "", t, AV_DICT_IGNORE_SUFFIX))) { |
avio_put_str(pb, t->key); |
avio_put_str(pb, t->value); |
} |
} |
|
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) |
{ |
CAFContext *caf = s->priv_data; |
|
avio_write(s->pb, pkt->data, pkt->size); |
if (!s->streams[0]->codec->block_align) { |
void *pkt_sizes = caf->pkt_sizes; |
int i, alloc_size = caf->size_entries_used + 5; |
if (alloc_size < 0) { |
caf->pkt_sizes = NULL; |
} else { |
caf->pkt_sizes = av_fast_realloc(caf->pkt_sizes, |
&caf->size_buffer_size, |
alloc_size); |
} |
if (!caf->pkt_sizes) { |
av_free(pkt_sizes); |
return AVERROR(ENOMEM); |
} |
for (i = 4; i > 0; i--) { |
unsigned top = pkt->size >> i * 7; |
if (top) |
caf->pkt_sizes[caf->size_entries_used++] = 128 | top; |
} |
caf->pkt_sizes[caf->size_entries_used++] = pkt->size & 127; |
caf->packets++; |
} |
return 0; |
} |
|
static int caf_write_trailer(AVFormatContext *s) |
{ |
CAFContext *caf = s->priv_data; |
AVIOContext *pb = s->pb; |
AVCodecContext *enc = s->streams[0]->codec; |
|
if (pb->seekable) { |
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); |
if (!enc->block_align) { |
ffio_wfourcc(pb, "pakt"); |
avio_wb64(pb, caf->size_entries_used + 24); |
avio_wb64(pb, caf->packets); ///< mNumberPackets |
avio_wb64(pb, caf->packets * samples_per_packet(enc->codec_id, enc->channels, enc->block_align)); ///< mNumberValidFrames |
avio_wb32(pb, 0); ///< mPrimingFrames |
avio_wb32(pb, 0); ///< mRemainderFrames |
avio_write(pb, caf->pkt_sizes, caf->size_entries_used); |
caf->size_buffer_size = 0; |
} |
avio_flush(pb); |
} |
av_freep(&caf->pkt_sizes); |
return 0; |
} |
|
AVOutputFormat ff_caf_muxer = { |
.name = "caf", |
.long_name = NULL_IF_CONFIG_SMALL("Apple CAF (Core Audio Format)"), |
.mime_type = "audio/x-caf", |
.extensions = "caf", |
.priv_data_size = sizeof(CAFContext), |
.audio_codec = AV_CODEC_ID_PCM_S16BE, |
.video_codec = AV_CODEC_ID_NONE, |
.write_header = caf_write_header, |
.write_packet = caf_write_packet, |
.write_trailer = caf_write_trailer, |
.codec_tag = (const AVCodecTag* const []){ff_codec_caf_tags, 0}, |
}; |