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  1. /*
  2.  * Core Audio Format muxer
  3.  * Copyright (c) 2011 Carl Eugen Hoyos
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. #include "avformat.h"
  23. #include "caf.h"
  24. #include "isom.h"
  25. #include "avio_internal.h"
  26. #include "libavutil/intfloat.h"
  27. #include "libavutil/dict.h"
  28.  
  29. typedef struct {
  30.     int64_t data;
  31.     uint8_t *pkt_sizes;
  32.     int size_buffer_size;
  33.     int size_entries_used;
  34.     int packets;
  35. } CAFContext;
  36.  
  37. static uint32_t codec_flags(enum AVCodecID codec_id) {
  38.     switch (codec_id) {
  39.     case AV_CODEC_ID_PCM_F32BE:
  40.     case AV_CODEC_ID_PCM_F64BE:
  41.         return 1; //< kCAFLinearPCMFormatFlagIsFloat
  42.     case AV_CODEC_ID_PCM_S16LE:
  43.     case AV_CODEC_ID_PCM_S24LE:
  44.     case AV_CODEC_ID_PCM_S32LE:
  45.         return 2; //< kCAFLinearPCMFormatFlagIsLittleEndian
  46.     case AV_CODEC_ID_PCM_F32LE:
  47.     case AV_CODEC_ID_PCM_F64LE:
  48.         return 3; //< kCAFLinearPCMFormatFlagIsFloat | kCAFLinearPCMFormatFlagIsLittleEndian
  49.     default:
  50.         return 0;
  51.     }
  52. }
  53.  
  54. static uint32_t samples_per_packet(enum AVCodecID codec_id, int channels, int block_align) {
  55.     switch (codec_id) {
  56.     case AV_CODEC_ID_PCM_S8:
  57.     case AV_CODEC_ID_PCM_S16LE:
  58.     case AV_CODEC_ID_PCM_S16BE:
  59.     case AV_CODEC_ID_PCM_S24LE:
  60.     case AV_CODEC_ID_PCM_S24BE:
  61.     case AV_CODEC_ID_PCM_S32LE:
  62.     case AV_CODEC_ID_PCM_S32BE:
  63.     case AV_CODEC_ID_PCM_F32LE:
  64.     case AV_CODEC_ID_PCM_F32BE:
  65.     case AV_CODEC_ID_PCM_F64LE:
  66.     case AV_CODEC_ID_PCM_F64BE:
  67.     case AV_CODEC_ID_PCM_ALAW:
  68.     case AV_CODEC_ID_PCM_MULAW:
  69.         return 1;
  70.     case AV_CODEC_ID_MACE3:
  71.     case AV_CODEC_ID_MACE6:
  72.         return 6;
  73.     case AV_CODEC_ID_ADPCM_IMA_QT:
  74.         return 64;
  75.     case AV_CODEC_ID_AMR_NB:
  76.     case AV_CODEC_ID_GSM:
  77.     case AV_CODEC_ID_ILBC:
  78.     case AV_CODEC_ID_QCELP:
  79.         return 160;
  80.     case AV_CODEC_ID_GSM_MS:
  81.         return 320;
  82.     case AV_CODEC_ID_MP1:
  83.         return 384;
  84.     case AV_CODEC_ID_MP2:
  85.     case AV_CODEC_ID_MP3:
  86.         return 1152;
  87.     case AV_CODEC_ID_AC3:
  88.         return 1536;
  89.     case AV_CODEC_ID_QDM2:
  90.         return 2048 * channels;
  91.     case AV_CODEC_ID_ALAC:
  92.         return 4096;
  93.     case AV_CODEC_ID_ADPCM_IMA_WAV:
  94.         return (block_align - 4 * channels) * 8 / (4 * channels) + 1;
  95.     case AV_CODEC_ID_ADPCM_MS:
  96.         return (block_align - 7 * channels) * 2 / channels + 2;
  97.     default:
  98.         return 0;
  99.     }
  100. }
  101.  
  102. static int caf_write_header(AVFormatContext *s)
  103. {
  104.     AVIOContext *pb = s->pb;
  105.     AVCodecContext *enc = s->streams[0]->codec;
  106.     CAFContext *caf = s->priv_data;
  107.     AVDictionaryEntry *t = NULL;
  108.     unsigned int codec_tag = ff_codec_get_tag(ff_codec_caf_tags, enc->codec_id);
  109.     int64_t chunk_size = 0;
  110.     int frame_size = enc->frame_size;
  111.  
  112.     if (s->nb_streams != 1) {
  113.         av_log(s, AV_LOG_ERROR, "CAF files have exactly one stream\n");
  114.         return AVERROR(EINVAL);
  115.     }
  116.  
  117.     switch (enc->codec_id) {
  118.     case AV_CODEC_ID_AAC:
  119.         av_log(s, AV_LOG_ERROR, "muxing codec currently unsupported\n");
  120.         return AVERROR_PATCHWELCOME;
  121.     }
  122.  
  123.     switch (enc->codec_id) {
  124.     case AV_CODEC_ID_PCM_S8:
  125.     case AV_CODEC_ID_PCM_S16LE:
  126.     case AV_CODEC_ID_PCM_S16BE:
  127.     case AV_CODEC_ID_PCM_S24LE:
  128.     case AV_CODEC_ID_PCM_S24BE:
  129.     case AV_CODEC_ID_PCM_S32LE:
  130.     case AV_CODEC_ID_PCM_S32BE:
  131.     case AV_CODEC_ID_PCM_F32LE:
  132.     case AV_CODEC_ID_PCM_F32BE:
  133.     case AV_CODEC_ID_PCM_F64LE:
  134.     case AV_CODEC_ID_PCM_F64BE:
  135.         codec_tag = MKTAG('l','p','c','m');
  136.     }
  137.  
  138.     if (!codec_tag) {
  139.         av_log(s, AV_LOG_ERROR, "unsupported codec\n");
  140.         return AVERROR_INVALIDDATA;
  141.     }
  142.  
  143.     if (!enc->block_align && !pb->seekable) {
  144.         av_log(s, AV_LOG_ERROR, "Muxing variable packet size not supported on non seekable output\n");
  145.         return AVERROR_INVALIDDATA;
  146.     }
  147.  
  148.     if (enc->codec_id != AV_CODEC_ID_MP3 || frame_size != 576)
  149.         frame_size = samples_per_packet(enc->codec_id, enc->channels, enc->block_align);
  150.  
  151.     ffio_wfourcc(pb, "caff"); //< mFileType
  152.     avio_wb16(pb, 1);         //< mFileVersion
  153.     avio_wb16(pb, 0);         //< mFileFlags
  154.  
  155.     ffio_wfourcc(pb, "desc");                         //< Audio Description chunk
  156.     avio_wb64(pb, 32);                                //< mChunkSize
  157.     avio_wb64(pb, av_double2int(enc->sample_rate));   //< mSampleRate
  158.     avio_wl32(pb, codec_tag);                         //< mFormatID
  159.     avio_wb32(pb, codec_flags(enc->codec_id));        //< mFormatFlags
  160.     avio_wb32(pb, enc->block_align);                  //< mBytesPerPacket
  161.     avio_wb32(pb, frame_size);                        //< mFramesPerPacket
  162.     avio_wb32(pb, enc->channels);                     //< mChannelsPerFrame
  163.     avio_wb32(pb, av_get_bits_per_sample(enc->codec_id)); //< mBitsPerChannel
  164.  
  165.     if (enc->channel_layout) {
  166.         ffio_wfourcc(pb, "chan");
  167.         avio_wb64(pb, 12);
  168.         ff_mov_write_chan(pb, enc->channel_layout);
  169.     }
  170.  
  171.     if (enc->codec_id == AV_CODEC_ID_ALAC) {
  172.         ffio_wfourcc(pb, "kuki");
  173.         avio_wb64(pb, 12 + enc->extradata_size);
  174.         avio_write(pb, "\0\0\0\14frmaalac", 12);
  175.         avio_write(pb, enc->extradata, enc->extradata_size);
  176.     } else if (enc->codec_id == AV_CODEC_ID_AMR_NB) {
  177.         ffio_wfourcc(pb, "kuki");
  178.         avio_wb64(pb, 29);
  179.         avio_write(pb, "\0\0\0\14frmasamr", 12);
  180.         avio_wb32(pb, 0x11); /* size */
  181.         avio_write(pb, "samrFFMP", 8);
  182.         avio_w8(pb, 0); /* decoder version */
  183.  
  184.         avio_wb16(pb, 0x81FF); /* Mode set (all modes for AMR_NB) */
  185.         avio_w8(pb, 0x00); /* Mode change period (no restriction) */
  186.         avio_w8(pb, 0x01); /* Frames per sample */
  187.     } else if (enc->codec_id == AV_CODEC_ID_QDM2) {
  188.         ffio_wfourcc(pb, "kuki");
  189.         avio_wb64(pb, enc->extradata_size);
  190.         avio_write(pb, enc->extradata, enc->extradata_size);
  191.     }
  192.  
  193.     if (av_dict_count(s->metadata)) {
  194.         ffio_wfourcc(pb, "info"); //< Information chunk
  195.         while ((t = av_dict_get(s->metadata, "", t, AV_DICT_IGNORE_SUFFIX))) {
  196.             chunk_size += strlen(t->key) + strlen(t->value) + 2;
  197.         }
  198.         avio_wb64(pb, chunk_size + 4);
  199.         avio_wb32(pb, av_dict_count(s->metadata));
  200.         t = NULL;
  201.         while ((t = av_dict_get(s->metadata, "", t, AV_DICT_IGNORE_SUFFIX))) {
  202.             avio_put_str(pb, t->key);
  203.             avio_put_str(pb, t->value);
  204.         }
  205.     }
  206.  
  207.     ffio_wfourcc(pb, "data"); //< Audio Data chunk
  208.     caf->data = avio_tell(pb);
  209.     avio_wb64(pb, -1);        //< mChunkSize
  210.     avio_wb32(pb, 0);         //< mEditCount
  211.  
  212.     avio_flush(pb);
  213.     return 0;
  214. }
  215.  
  216. static int caf_write_packet(AVFormatContext *s, AVPacket *pkt)
  217. {
  218.     CAFContext *caf = s->priv_data;
  219.  
  220.     avio_write(s->pb, pkt->data, pkt->size);
  221.     if (!s->streams[0]->codec->block_align) {
  222.         void *pkt_sizes = caf->pkt_sizes;
  223.         int i, alloc_size = caf->size_entries_used + 5;
  224.         if (alloc_size < 0) {
  225.             caf->pkt_sizes = NULL;
  226.         } else {
  227.             caf->pkt_sizes = av_fast_realloc(caf->pkt_sizes,
  228.                                              &caf->size_buffer_size,
  229.                                              alloc_size);
  230.         }
  231.         if (!caf->pkt_sizes) {
  232.             av_free(pkt_sizes);
  233.             return AVERROR(ENOMEM);
  234.         }
  235.         for (i = 4; i > 0; i--) {
  236.             unsigned top = pkt->size >> i * 7;
  237.             if (top)
  238.                 caf->pkt_sizes[caf->size_entries_used++] = 128 | top;
  239.         }
  240.         caf->pkt_sizes[caf->size_entries_used++] = pkt->size & 127;
  241.         caf->packets++;
  242.     }
  243.     return 0;
  244. }
  245.  
  246. static int caf_write_trailer(AVFormatContext *s)
  247. {
  248.     CAFContext *caf = s->priv_data;
  249.     AVIOContext *pb = s->pb;
  250.     AVCodecContext *enc = s->streams[0]->codec;
  251.  
  252.     if (pb->seekable) {
  253.         int64_t file_size = avio_tell(pb);
  254.  
  255.         avio_seek(pb, caf->data, SEEK_SET);
  256.         avio_wb64(pb, file_size - caf->data - 8);
  257.         avio_seek(pb, file_size, SEEK_SET);
  258.         if (!enc->block_align) {
  259.             ffio_wfourcc(pb, "pakt");
  260.             avio_wb64(pb, caf->size_entries_used + 24);
  261.             avio_wb64(pb, caf->packets); ///< mNumberPackets
  262.             avio_wb64(pb, caf->packets * samples_per_packet(enc->codec_id, enc->channels, enc->block_align)); ///< mNumberValidFrames
  263.             avio_wb32(pb, 0); ///< mPrimingFrames
  264.             avio_wb32(pb, 0); ///< mRemainderFrames
  265.             avio_write(pb, caf->pkt_sizes, caf->size_entries_used);
  266.             caf->size_buffer_size = 0;
  267.         }
  268.         avio_flush(pb);
  269.     }
  270.     av_freep(&caf->pkt_sizes);
  271.     return 0;
  272. }
  273.  
  274. AVOutputFormat ff_caf_muxer = {
  275.     .name           = "caf",
  276.     .long_name      = NULL_IF_CONFIG_SMALL("Apple CAF (Core Audio Format)"),
  277.     .mime_type      = "audio/x-caf",
  278.     .extensions     = "caf",
  279.     .priv_data_size = sizeof(CAFContext),
  280.     .audio_codec    = AV_CODEC_ID_PCM_S16BE,
  281.     .video_codec    = AV_CODEC_ID_NONE,
  282.     .write_header   = caf_write_header,
  283.     .write_packet   = caf_write_packet,
  284.     .write_trailer  = caf_write_trailer,
  285.     .codec_tag      = (const AVCodecTag* const []){ff_codec_caf_tags, 0},
  286. };
  287.