LCOV - code coverage report
Current view: top level - src/libavformat - cafenc.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 74 136 54.4 %
Date: 2017-01-24 04:42:20 Functions: 5 5 100.0 %

          Line data    Source code
       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           1 : static uint32_t codec_flags(enum AVCodecID codec_id) {
      38           1 :     switch (codec_id) {
      39             :     case AV_CODEC_ID_PCM_F32BE:
      40             :     case AV_CODEC_ID_PCM_F64BE:
      41           0 :         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           0 :         return 2; //< kCAFLinearPCMFormatFlagIsLittleEndian
      46             :     case AV_CODEC_ID_PCM_F32LE:
      47             :     case AV_CODEC_ID_PCM_F64LE:
      48           0 :         return 3; //< kCAFLinearPCMFormatFlagIsFloat | kCAFLinearPCMFormatFlagIsLittleEndian
      49             :     default:
      50           1 :         return 0;
      51             :     }
      52             : }
      53             : 
      54           1 : static uint32_t samples_per_packet(enum AVCodecID codec_id, int channels, int block_align) {
      55           1 :     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           1 :         return 1;
      70             :     case AV_CODEC_ID_MACE3:
      71             :     case AV_CODEC_ID_MACE6:
      72           0 :         return 6;
      73             :     case AV_CODEC_ID_ADPCM_IMA_QT:
      74           0 :         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           0 :         return 160;
      80             :     case AV_CODEC_ID_GSM_MS:
      81           0 :         return 320;
      82             :     case AV_CODEC_ID_MP1:
      83           0 :         return 384;
      84             :     case AV_CODEC_ID_MP2:
      85             :     case AV_CODEC_ID_MP3:
      86           0 :         return 1152;
      87             :     case AV_CODEC_ID_AC3:
      88           0 :         return 1536;
      89             :     case AV_CODEC_ID_QDM2:
      90             :     case AV_CODEC_ID_QDMC:
      91           0 :         return 2048 * channels;
      92             :     case AV_CODEC_ID_ALAC:
      93           0 :         return 4096;
      94             :     case AV_CODEC_ID_ADPCM_IMA_WAV:
      95           0 :         return (block_align - 4 * channels) * 8 / (4 * channels) + 1;
      96             :     case AV_CODEC_ID_ADPCM_MS:
      97           0 :         return (block_align - 7 * channels) * 2 / channels + 2;
      98             :     default:
      99           0 :         return 0;
     100             :     }
     101             : }
     102             : 
     103           1 : static int caf_write_header(AVFormatContext *s)
     104             : {
     105           1 :     AVIOContext *pb = s->pb;
     106           1 :     AVCodecParameters *par = s->streams[0]->codecpar;
     107           1 :     CAFContext *caf = s->priv_data;
     108           1 :     AVDictionaryEntry *t = NULL;
     109           1 :     unsigned int codec_tag = ff_codec_get_tag(ff_codec_caf_tags, par->codec_id);
     110           1 :     int64_t chunk_size = 0;
     111           1 :     int frame_size = par->frame_size;
     112             : 
     113           1 :     if (s->nb_streams != 1) {
     114           0 :         av_log(s, AV_LOG_ERROR, "CAF files have exactly one stream\n");
     115           0 :         return AVERROR(EINVAL);
     116             :     }
     117             : 
     118           1 :     switch (par->codec_id) {
     119             :     case AV_CODEC_ID_AAC:
     120           0 :         av_log(s, AV_LOG_ERROR, "muxing codec currently unsupported\n");
     121           0 :         return AVERROR_PATCHWELCOME;
     122             :     }
     123             : 
     124           1 :     if (!codec_tag) {
     125           0 :         av_log(s, AV_LOG_ERROR, "unsupported codec\n");
     126           0 :         return AVERROR_INVALIDDATA;
     127             :     }
     128             : 
     129           1 :     if (!par->block_align && !pb->seekable) {
     130           0 :         av_log(s, AV_LOG_ERROR, "Muxing variable packet size not supported on non seekable output\n");
     131           0 :         return AVERROR_INVALIDDATA;
     132             :     }
     133             : 
     134           1 :     if (par->codec_id != AV_CODEC_ID_MP3 || frame_size != 576)
     135           1 :         frame_size = samples_per_packet(par->codec_id, par->channels, par->block_align);
     136             : 
     137           1 :     ffio_wfourcc(pb, "caff"); //< mFileType
     138           1 :     avio_wb16(pb, 1);         //< mFileVersion
     139           1 :     avio_wb16(pb, 0);         //< mFileFlags
     140             : 
     141           1 :     ffio_wfourcc(pb, "desc");                         //< Audio Description chunk
     142           1 :     avio_wb64(pb, 32);                                //< mChunkSize
     143           1 :     avio_wb64(pb, av_double2int(par->sample_rate));   //< mSampleRate
     144           1 :     avio_wl32(pb, codec_tag);                         //< mFormatID
     145           1 :     avio_wb32(pb, codec_flags(par->codec_id));        //< mFormatFlags
     146           1 :     avio_wb32(pb, par->block_align);                  //< mBytesPerPacket
     147           1 :     avio_wb32(pb, frame_size);                        //< mFramesPerPacket
     148           1 :     avio_wb32(pb, par->channels);                     //< mChannelsPerFrame
     149           1 :     avio_wb32(pb, av_get_bits_per_sample(par->codec_id)); //< mBitsPerChannel
     150             : 
     151           1 :     if (par->channel_layout) {
     152           1 :         ffio_wfourcc(pb, "chan");
     153           1 :         avio_wb64(pb, 12);
     154           1 :         ff_mov_write_chan(pb, par->channel_layout);
     155             :     }
     156             : 
     157           1 :     if (par->codec_id == AV_CODEC_ID_ALAC) {
     158           0 :         ffio_wfourcc(pb, "kuki");
     159           0 :         avio_wb64(pb, 12 + par->extradata_size);
     160           0 :         avio_write(pb, "\0\0\0\14frmaalac", 12);
     161           0 :         avio_write(pb, par->extradata, par->extradata_size);
     162           1 :     } else if (par->codec_id == AV_CODEC_ID_AMR_NB) {
     163           0 :         ffio_wfourcc(pb, "kuki");
     164           0 :         avio_wb64(pb, 29);
     165           0 :         avio_write(pb, "\0\0\0\14frmasamr", 12);
     166           0 :         avio_wb32(pb, 0x11); /* size */
     167           0 :         avio_write(pb, "samrFFMP", 8);
     168           0 :         avio_w8(pb, 0); /* decoder version */
     169             : 
     170           0 :         avio_wb16(pb, 0x81FF); /* Mode set (all modes for AMR_NB) */
     171           0 :         avio_w8(pb, 0x00); /* Mode change period (no restriction) */
     172           0 :         avio_w8(pb, 0x01); /* Frames per sample */
     173           1 :     } else if (par->codec_id == AV_CODEC_ID_QDM2 || par->codec_id == AV_CODEC_ID_QDMC) {
     174           0 :         ffio_wfourcc(pb, "kuki");
     175           0 :         avio_wb64(pb, par->extradata_size);
     176           0 :         avio_write(pb, par->extradata, par->extradata_size);
     177             :     }
     178             : 
     179           1 :     ff_standardize_creation_time(s);
     180           1 :     if (av_dict_count(s->metadata)) {
     181           1 :         ffio_wfourcc(pb, "info"); //< Information chunk
     182           3 :         while ((t = av_dict_get(s->metadata, "", t, AV_DICT_IGNORE_SUFFIX))) {
     183           1 :             chunk_size += strlen(t->key) + strlen(t->value) + 2;
     184             :         }
     185           1 :         avio_wb64(pb, chunk_size + 4);
     186           1 :         avio_wb32(pb, av_dict_count(s->metadata));
     187           1 :         t = NULL;
     188           3 :         while ((t = av_dict_get(s->metadata, "", t, AV_DICT_IGNORE_SUFFIX))) {
     189           1 :             avio_put_str(pb, t->key);
     190           1 :             avio_put_str(pb, t->value);
     191             :         }
     192             :     }
     193             : 
     194           1 :     ffio_wfourcc(pb, "data"); //< Audio Data chunk
     195           1 :     caf->data = avio_tell(pb);
     196           1 :     avio_wb64(pb, -1);        //< mChunkSize
     197           1 :     avio_wb32(pb, 0);         //< mEditCount
     198             : 
     199           1 :     avio_flush(pb);
     200           1 :     return 0;
     201             : }
     202             : 
     203          44 : static int caf_write_packet(AVFormatContext *s, AVPacket *pkt)
     204             : {
     205          44 :     CAFContext *caf = s->priv_data;
     206             : 
     207          44 :     avio_write(s->pb, pkt->data, pkt->size);
     208          44 :     if (!s->streams[0]->codecpar->block_align) {
     209           0 :         void *pkt_sizes = caf->pkt_sizes;
     210           0 :         int i, alloc_size = caf->size_entries_used + 5;
     211           0 :         if (alloc_size < 0) {
     212           0 :             caf->pkt_sizes = NULL;
     213             :         } else {
     214           0 :             caf->pkt_sizes = av_fast_realloc(caf->pkt_sizes,
     215           0 :                                              &caf->size_buffer_size,
     216             :                                              alloc_size);
     217             :         }
     218           0 :         if (!caf->pkt_sizes) {
     219           0 :             av_free(pkt_sizes);
     220           0 :             return AVERROR(ENOMEM);
     221             :         }
     222           0 :         for (i = 4; i > 0; i--) {
     223           0 :             unsigned top = pkt->size >> i * 7;
     224           0 :             if (top)
     225           0 :                 caf->pkt_sizes[caf->size_entries_used++] = 128 | top;
     226             :         }
     227           0 :         caf->pkt_sizes[caf->size_entries_used++] = pkt->size & 127;
     228           0 :         caf->packets++;
     229             :     }
     230          44 :     return 0;
     231             : }
     232             : 
     233           1 : static int caf_write_trailer(AVFormatContext *s)
     234             : {
     235           1 :     CAFContext *caf = s->priv_data;
     236           1 :     AVIOContext *pb = s->pb;
     237           1 :     AVCodecParameters *par = s->streams[0]->codecpar;
     238             : 
     239           1 :     if (pb->seekable) {
     240           1 :         int64_t file_size = avio_tell(pb);
     241             : 
     242           1 :         avio_seek(pb, caf->data, SEEK_SET);
     243           1 :         avio_wb64(pb, file_size - caf->data - 8);
     244           1 :         avio_seek(pb, file_size, SEEK_SET);
     245           1 :         if (!par->block_align) {
     246           0 :             ffio_wfourcc(pb, "pakt");
     247           0 :             avio_wb64(pb, caf->size_entries_used + 24);
     248           0 :             avio_wb64(pb, caf->packets); ///< mNumberPackets
     249           0 :             avio_wb64(pb, caf->packets * samples_per_packet(par->codec_id, par->channels, par->block_align)); ///< mNumberValidFrames
     250           0 :             avio_wb32(pb, 0); ///< mPrimingFrames
     251           0 :             avio_wb32(pb, 0); ///< mRemainderFrames
     252           0 :             avio_write(pb, caf->pkt_sizes, caf->size_entries_used);
     253           0 :             caf->size_buffer_size = 0;
     254             :         }
     255           1 :         avio_flush(pb);
     256             :     }
     257           1 :     av_freep(&caf->pkt_sizes);
     258           1 :     return 0;
     259             : }
     260             : 
     261             : AVOutputFormat ff_caf_muxer = {
     262             :     .name           = "caf",
     263             :     .long_name      = NULL_IF_CONFIG_SMALL("Apple CAF (Core Audio Format)"),
     264             :     .mime_type      = "audio/x-caf",
     265             :     .extensions     = "caf",
     266             :     .priv_data_size = sizeof(CAFContext),
     267             :     .audio_codec    = AV_CODEC_ID_PCM_S16BE,
     268             :     .video_codec    = AV_CODEC_ID_NONE,
     269             :     .write_header   = caf_write_header,
     270             :     .write_packet   = caf_write_packet,
     271             :     .write_trailer  = caf_write_trailer,
     272             :     .codec_tag      = (const AVCodecTag* const []){ff_codec_caf_tags, 0},
     273             : };

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