mirror of https://git.ffmpeg.org/ffmpeg.git
245 lines
7.4 KiB
C
245 lines
7.4 KiB
C
/*
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* Core Audio Format muxer
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* Copyright (c) 2011 Carl Eugen Hoyos
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "avformat.h"
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#include "caf.h"
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#include "riff.h"
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#include "isom.h"
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#include "avio_internal.h"
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#include "libavutil/intfloat_readwrite.h"
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typedef struct {
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int64_t data;
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uint8_t *pkt_sizes;
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int size_buffer_size;
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int size_entries_used;
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int packets;
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} CAFContext;
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static uint32_t codec_flags(enum CodecID codec_id) {
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switch (codec_id) {
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case CODEC_ID_PCM_F32BE:
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case CODEC_ID_PCM_F64BE:
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return 1; //< kCAFLinearPCMFormatFlagIsFloat
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case CODEC_ID_PCM_S16LE:
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case CODEC_ID_PCM_S24LE:
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case CODEC_ID_PCM_S32LE:
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return 2; //< kCAFLinearPCMFormatFlagIsLittleEndian
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case CODEC_ID_PCM_F32LE:
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case CODEC_ID_PCM_F64LE:
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return 3; //< kCAFLinearPCMFormatFlagIsFloat | kCAFLinearPCMFormatFlagIsLittleEndian
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default:
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return 0;
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}
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}
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static uint32_t samples_per_packet(enum CodecID codec_id, int channels) {
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switch (codec_id) {
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case CODEC_ID_PCM_S8:
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case CODEC_ID_PCM_S16LE:
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case CODEC_ID_PCM_S16BE:
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case CODEC_ID_PCM_S24LE:
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case CODEC_ID_PCM_S24BE:
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case CODEC_ID_PCM_S32LE:
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case CODEC_ID_PCM_S32BE:
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case CODEC_ID_PCM_F32LE:
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case CODEC_ID_PCM_F32BE:
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case CODEC_ID_PCM_F64LE:
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case CODEC_ID_PCM_F64BE:
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case CODEC_ID_PCM_ALAW:
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case CODEC_ID_PCM_MULAW:
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return 1;
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case CODEC_ID_MACE3:
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case CODEC_ID_MACE6:
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return 6;
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case CODEC_ID_ADPCM_IMA_QT:
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return 64;
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case CODEC_ID_AMR_NB:
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case CODEC_ID_GSM:
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case CODEC_ID_QCELP:
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return 160;
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case CODEC_ID_GSM_MS:
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return 320;
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case CODEC_ID_MP1:
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return 384;
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case CODEC_ID_MP2:
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case CODEC_ID_MP3:
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return 1152;
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case CODEC_ID_AC3:
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return 1536;
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case CODEC_ID_ALAC:
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case CODEC_ID_QDM2:
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return 4096;
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case CODEC_ID_ADPCM_IMA_WAV:
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return (1024 - 4 * channels) * 8 / (4 * channels) + 1;
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case CODEC_ID_ADPCM_MS:
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return (1024 - 7 * channels) * 2 / channels + 2;
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default:
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return 0;
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}
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}
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static int caf_write_header(AVFormatContext *s)
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{
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AVIOContext *pb = s->pb;
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AVCodecContext *enc = s->streams[0]->codec;
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CAFContext *caf = s->priv_data;
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unsigned int codec_tag = ff_codec_get_tag(ff_codec_caf_tags, enc->codec_id);
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switch (enc->codec_id) {
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case CODEC_ID_AAC:
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case CODEC_ID_AC3:
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case CODEC_ID_ALAC:
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case CODEC_ID_AMR_NB:
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case CODEC_ID_QCELP:
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case CODEC_ID_QDM2:
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av_log(s, AV_LOG_ERROR, "muxing codec currently unsupported\n");
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return AVERROR_PATCHWELCOME;
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}
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switch (enc->codec_id) {
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case CODEC_ID_PCM_S8:
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case CODEC_ID_PCM_S16LE:
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case CODEC_ID_PCM_S16BE:
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case CODEC_ID_PCM_S24LE:
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case CODEC_ID_PCM_S24BE:
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case CODEC_ID_PCM_S32LE:
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case CODEC_ID_PCM_S32BE:
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case CODEC_ID_PCM_F32LE:
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case CODEC_ID_PCM_F32BE:
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case CODEC_ID_PCM_F64LE:
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case CODEC_ID_PCM_F64BE:
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case CODEC_ID_PCM_ALAW:
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case CODEC_ID_PCM_MULAW:
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codec_tag = MKTAG('l','p','c','m');
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}
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if (!codec_tag) {
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av_log(s, AV_LOG_ERROR, "unsupported codec\n");
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return AVERROR_INVALIDDATA;
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}
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if (!enc->block_align && !pb->seekable) {
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av_log(s, AV_LOG_ERROR, "Muxing variable packet size not supported on non seekable output\n");
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return AVERROR_INVALIDDATA;
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}
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ffio_wfourcc(pb, "caff"); //< mFileType
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avio_wb16(pb, 1); //< mFileVersion
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avio_wb16(pb, 0); //< mFileFlags
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ffio_wfourcc(pb, "desc"); //< Audio Description chunk
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avio_wb64(pb, 32); //< mChunkSize
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avio_wb64(pb, av_dbl2int(enc->sample_rate)); //< mSampleRate
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avio_wl32(pb, codec_tag); //< mFormatID
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avio_wb32(pb, codec_flags(enc->codec_id)); //< mFormatFlags
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avio_wb32(pb, enc->block_align); //< mBytesPerPacket
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avio_wb32(pb, samples_per_packet(enc->codec_id, enc->channels)); //< mFramesPerPacket
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avio_wb32(pb, enc->channels); //< mChannelsPerFrame
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avio_wb32(pb, av_get_bits_per_sample(enc->codec_id)); //< mBitsPerChannel
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if (enc->channel_layout) {
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ffio_wfourcc(pb, "chan");
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avio_wb64(pb, 12);
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ff_mov_write_chan(pb, enc->channel_layout);
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}
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ffio_wfourcc(pb, "data"); //< Audio Data chunk
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caf->data = avio_tell(pb);
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avio_wb64(pb, -1); //< mChunkSize
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avio_wb32(pb, 0); //< mEditCount
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avio_flush(pb);
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return 0;
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}
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static int caf_write_packet(AVFormatContext *s, AVPacket *pkt)
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{
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CAFContext *caf = s->priv_data;
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avio_write(s->pb, pkt->data, pkt->size);
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if (!s->streams[0]->codec->block_align) {
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void *pkt_sizes = caf->pkt_sizes;
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int i, alloc_size = caf->size_entries_used + 5;
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if (alloc_size < 0) {
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caf->pkt_sizes = NULL;
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} else {
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caf->pkt_sizes = av_fast_realloc(caf->pkt_sizes,
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&caf->size_buffer_size,
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alloc_size);
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}
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if (!caf->pkt_sizes) {
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av_free(pkt_sizes);
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return AVERROR(ENOMEM);
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}
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for (i = 4; i > 0; i--) {
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unsigned top = pkt->size >> i * 7;
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if (top)
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caf->pkt_sizes[caf->size_entries_used++] = 128 | top;
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}
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caf->pkt_sizes[caf->size_entries_used++] = pkt->size & 127;
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caf->packets++;
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}
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return 0;
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}
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static int caf_write_trailer(AVFormatContext *s)
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{
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AVIOContext *pb = s->pb;
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AVCodecContext *enc = s->streams[0]->codec;
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if (pb->seekable) {
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CAFContext *caf = s->priv_data;
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int64_t file_size = avio_tell(pb);
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avio_seek(pb, caf->data, SEEK_SET);
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avio_wb64(pb, file_size - caf->data - 8);
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avio_seek(pb, file_size, SEEK_SET);
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if (!enc->block_align) {
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ffio_wfourcc(pb, "pakt");
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avio_wb64(pb, caf->size_entries_used + 24);
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avio_wb64(pb, caf->packets); ///< mNumberPackets
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avio_wb64(pb, caf->packets * samples_per_packet(enc->codec_id, enc->channels)); ///< mNumberValidFrames
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avio_wb32(pb, 0); ///< mPrimingFrames
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avio_wb32(pb, 0); ///< mRemainderFrames
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avio_write(pb, caf->pkt_sizes, caf->size_entries_used);
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av_freep(&caf->pkt_sizes);
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caf->size_buffer_size = 0;
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}
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avio_flush(pb);
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}
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return 0;
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}
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AVOutputFormat ff_caf_muxer = {
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"caf",
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NULL_IF_CONFIG_SMALL("Apple Core Audio Format"),
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"audio/x-caf",
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"caf",
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sizeof(CAFContext),
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CODEC_ID_PCM_S16BE,
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CODEC_ID_NONE,
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caf_write_header,
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caf_write_packet,
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caf_write_trailer,
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.codec_tag= (const AVCodecTag* const []){ff_codec_caf_tags, 0},
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};
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