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https://github.com/FFmpeg/FFmpeg.git
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ed240db9e3
Frame size of Opus stream was previously presumed here to be 960 samples (20ms), however sizes of 120, 240, 480, 1920, and 2880 are also allowed. It can also alter on a per-packet basis and even multiple frames may be present in a single packet according to the specification, for the sake of simplicity however, let us assume that this doesn't occur. Because the mFramesPerPacket field, representing the number of samples per packet in the ffmpeg terminilogy, is the key factor in calculating packet durations and all that follows from that (index, bitrate, ...), it is crucial to get right. Therefore, if the packet size is not available ahead of time (as it is in the case of Opus), calculate an average from the stream duration once we know how many packets there are and update the filed in the header.
286 lines
9.6 KiB
C
286 lines
9.6 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 "isom.h"
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#include "avio_internal.h"
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#include "libavutil/intfloat.h"
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#include "libavutil/dict.h"
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#define FRAME_SIZE_OFFSET 40
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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 AVCodecID codec_id) {
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switch (codec_id) {
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case AV_CODEC_ID_PCM_F32BE:
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case AV_CODEC_ID_PCM_F64BE:
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return 1; //< kCAFLinearPCMFormatFlagIsFloat
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case AV_CODEC_ID_PCM_S16LE:
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case AV_CODEC_ID_PCM_S24LE:
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case AV_CODEC_ID_PCM_S32LE:
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return 2; //< kCAFLinearPCMFormatFlagIsLittleEndian
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case AV_CODEC_ID_PCM_F32LE:
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case AV_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 AVCodecID codec_id, int channels, int block_align) {
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switch (codec_id) {
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case AV_CODEC_ID_PCM_S8:
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case AV_CODEC_ID_PCM_S16LE:
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case AV_CODEC_ID_PCM_S16BE:
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case AV_CODEC_ID_PCM_S24LE:
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case AV_CODEC_ID_PCM_S24BE:
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case AV_CODEC_ID_PCM_S32LE:
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case AV_CODEC_ID_PCM_S32BE:
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case AV_CODEC_ID_PCM_F32LE:
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case AV_CODEC_ID_PCM_F32BE:
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case AV_CODEC_ID_PCM_F64LE:
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case AV_CODEC_ID_PCM_F64BE:
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case AV_CODEC_ID_PCM_ALAW:
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case AV_CODEC_ID_PCM_MULAW:
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return 1;
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case AV_CODEC_ID_MACE3:
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case AV_CODEC_ID_MACE6:
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return 6;
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case AV_CODEC_ID_ADPCM_IMA_QT:
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return 64;
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case AV_CODEC_ID_AMR_NB:
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case AV_CODEC_ID_GSM:
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case AV_CODEC_ID_ILBC:
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case AV_CODEC_ID_QCELP:
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return 160;
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case AV_CODEC_ID_GSM_MS:
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return 320;
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case AV_CODEC_ID_MP1:
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return 384;
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case AV_CODEC_ID_MP2:
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case AV_CODEC_ID_MP3:
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return 1152;
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case AV_CODEC_ID_AC3:
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return 1536;
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case AV_CODEC_ID_QDM2:
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case AV_CODEC_ID_QDMC:
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return 2048 * channels;
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case AV_CODEC_ID_ALAC:
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return 4096;
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case AV_CODEC_ID_ADPCM_IMA_WAV:
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return (block_align - 4 * channels) * 8 / (4 * channels) + 1;
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case AV_CODEC_ID_ADPCM_MS:
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return (block_align - 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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AVCodecParameters *par = s->streams[0]->codecpar;
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CAFContext *caf = s->priv_data;
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AVDictionaryEntry *t = NULL;
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unsigned int codec_tag = ff_codec_get_tag(ff_codec_caf_tags, par->codec_id);
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int64_t chunk_size = 0;
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int frame_size = par->frame_size;
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if (s->nb_streams != 1) {
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av_log(s, AV_LOG_ERROR, "CAF files have exactly one stream\n");
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return AVERROR(EINVAL);
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}
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switch (par->codec_id) {
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case AV_CODEC_ID_AAC:
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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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if (par->codec_id == AV_CODEC_ID_OPUS && par->channels > 2) {
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av_log(s, AV_LOG_ERROR, "Only mono and stereo are supported for Opus\n");
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return AVERROR_INVALIDDATA;
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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 (!par->block_align && !(pb->seekable & AVIO_SEEKABLE_NORMAL)) {
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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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if (par->codec_id != AV_CODEC_ID_MP3 || frame_size != 576)
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frame_size = samples_per_packet(par->codec_id, par->channels, par->block_align);
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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_double2int(par->sample_rate)); //< mSampleRate
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avio_wl32(pb, codec_tag); //< mFormatID
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avio_wb32(pb, codec_flags(par->codec_id)); //< mFormatFlags
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avio_wb32(pb, par->block_align); //< mBytesPerPacket
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avio_wb32(pb, frame_size); //< mFramesPerPacket
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avio_wb32(pb, par->channels); //< mChannelsPerFrame
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avio_wb32(pb, av_get_bits_per_sample(par->codec_id)); //< mBitsPerChannel
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if (par->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, par->channel_layout);
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}
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if (par->codec_id == AV_CODEC_ID_ALAC) {
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ffio_wfourcc(pb, "kuki");
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avio_wb64(pb, 12 + par->extradata_size);
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avio_write(pb, "\0\0\0\14frmaalac", 12);
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avio_write(pb, par->extradata, par->extradata_size);
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} else if (par->codec_id == AV_CODEC_ID_AMR_NB) {
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ffio_wfourcc(pb, "kuki");
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avio_wb64(pb, 29);
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avio_write(pb, "\0\0\0\14frmasamr", 12);
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avio_wb32(pb, 0x11); /* size */
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avio_write(pb, "samrFFMP", 8);
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avio_w8(pb, 0); /* decoder version */
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avio_wb16(pb, 0x81FF); /* Mode set (all modes for AMR_NB) */
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avio_w8(pb, 0x00); /* Mode change period (no restriction) */
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avio_w8(pb, 0x01); /* Frames per sample */
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} else if (par->codec_id == AV_CODEC_ID_QDM2 || par->codec_id == AV_CODEC_ID_QDMC) {
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ffio_wfourcc(pb, "kuki");
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avio_wb64(pb, par->extradata_size);
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avio_write(pb, par->extradata, par->extradata_size);
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}
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ff_standardize_creation_time(s);
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if (av_dict_count(s->metadata)) {
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ffio_wfourcc(pb, "info"); //< Information chunk
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while ((t = av_dict_get(s->metadata, "", t, AV_DICT_IGNORE_SUFFIX))) {
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chunk_size += strlen(t->key) + strlen(t->value) + 2;
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}
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avio_wb64(pb, chunk_size + 4);
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avio_wb32(pb, av_dict_count(s->metadata));
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t = NULL;
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while ((t = av_dict_get(s->metadata, "", t, AV_DICT_IGNORE_SUFFIX))) {
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avio_put_str(pb, t->key);
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avio_put_str(pb, t->value);
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}
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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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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]->codecpar->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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CAFContext *caf = s->priv_data;
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AVIOContext *pb = s->pb;
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AVStream *st = s->streams[0];
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AVCodecParameters *par = st->codecpar;
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if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
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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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if (!par->block_align) {
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int packet_size = samples_per_packet(par->codec_id, par->channels, par->block_align);
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if (!packet_size) {
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packet_size = st->duration / (caf->packets - 1);
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avio_seek(pb, FRAME_SIZE_OFFSET, SEEK_SET);
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avio_wb32(pb, packet_size);
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}
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avio_seek(pb, file_size, SEEK_SET);
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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 * packet_size); ///< 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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caf->size_buffer_size = 0;
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}
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}
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av_freep(&caf->pkt_sizes);
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return 0;
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}
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const AVOutputFormat ff_caf_muxer = {
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.name = "caf",
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.long_name = NULL_IF_CONFIG_SMALL("Apple CAF (Core Audio Format)"),
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.mime_type = "audio/x-caf",
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.extensions = "caf",
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.priv_data_size = sizeof(CAFContext),
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.audio_codec = AV_CODEC_ID_PCM_S16BE,
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.video_codec = AV_CODEC_ID_NONE,
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.write_header = caf_write_header,
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.write_packet = caf_write_packet,
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.write_trailer = caf_write_trailer,
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.codec_tag = ff_caf_codec_tags_list,
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};
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