| 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 | }; |