| 1 | /* |
| 2 | * Yamaha SMAF format |
| 3 | * Copyright (c) 2005 Vidar Madsen |
| 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 "libavutil/channel_layout.h" |
| 23 | #include "avformat.h" |
| 24 | #include "avio_internal.h" |
| 25 | #include "internal.h" |
| 26 | #include "pcm.h" |
| 27 | #include "rawenc.h" |
| 28 | #include "riff.h" |
| 29 | |
| 30 | typedef struct { |
| 31 | int64_t atrpos, atsqpos, awapos; |
| 32 | int64_t data_end; |
| 33 | int stereo; |
| 34 | } MMFContext; |
| 35 | |
| 36 | static const int mmf_rates[] = { 4000, 8000, 11025, 22050, 44100 }; |
| 37 | |
| 38 | static int mmf_rate(int code) |
| 39 | { |
| 40 | if ((code < 0) || (code > 4)) |
| 41 | return -1; |
| 42 | return mmf_rates[code]; |
| 43 | } |
| 44 | |
| 45 | #if CONFIG_MMF_MUXER |
| 46 | static int mmf_rate_code(int rate) |
| 47 | { |
| 48 | int i; |
| 49 | for (i = 0; i < 5; i++) |
| 50 | if (mmf_rates[i] == rate) |
| 51 | return i; |
| 52 | return -1; |
| 53 | } |
| 54 | |
| 55 | /* Copy of end_tag() from avienc.c, but for big-endian chunk size */ |
| 56 | static void end_tag_be(AVIOContext *pb, int64_t start) |
| 57 | { |
| 58 | int64_t pos; |
| 59 | |
| 60 | pos = avio_tell(pb); |
| 61 | avio_seek(pb, start - 4, SEEK_SET); |
| 62 | avio_wb32(pb, (uint32_t)(pos - start)); |
| 63 | avio_seek(pb, pos, SEEK_SET); |
| 64 | } |
| 65 | |
| 66 | static int mmf_write_header(AVFormatContext *s) |
| 67 | { |
| 68 | MMFContext *mmf = s->priv_data; |
| 69 | AVIOContext *pb = s->pb; |
| 70 | int64_t pos; |
| 71 | int rate; |
| 72 | const char *version = s->flags & AVFMT_FLAG_BITEXACT ? |
| 73 | "VN:Lavf," : |
| 74 | "VN:"LIBAVFORMAT_IDENT","; |
| 75 | |
| 76 | rate = mmf_rate_code(s->streams[0]->codec->sample_rate); |
| 77 | if (rate < 0) { |
| 78 | av_log(s, AV_LOG_ERROR, "Unsupported sample rate %d, supported are 4000, 8000, 11025, 22050 and 44100\n", |
| 79 | s->streams[0]->codec->sample_rate); |
| 80 | return AVERROR(EINVAL); |
| 81 | } |
| 82 | |
| 83 | mmf->stereo = s->streams[0]->codec->channels > 1; |
| 84 | if (mmf->stereo && |
| 85 | s->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL) { |
| 86 | av_log(s, AV_LOG_ERROR, "Yamaha SMAF stereo is experimental, " |
| 87 | "add '-strict %d' if you want to use it.\n", |
| 88 | FF_COMPLIANCE_EXPERIMENTAL); |
| 89 | return AVERROR(EINVAL); |
| 90 | } |
| 91 | |
| 92 | ffio_wfourcc(pb, "MMMD"); |
| 93 | avio_wb32(pb, 0); |
| 94 | pos = ff_start_tag(pb, "CNTI"); |
| 95 | avio_w8(pb, 0); /* class */ |
| 96 | avio_w8(pb, 1); /* type */ |
| 97 | avio_w8(pb, 1); /* code type */ |
| 98 | avio_w8(pb, 0); /* status */ |
| 99 | avio_w8(pb, 0); /* counts */ |
| 100 | end_tag_be(pb, pos); |
| 101 | |
| 102 | pos = ff_start_tag(pb, "OPDA"); |
| 103 | avio_write(pb, version, strlen(version)); /* metadata ("ST:songtitle,VN:version,...") */ |
| 104 | end_tag_be(pb, pos); |
| 105 | |
| 106 | avio_write(pb, "ATR\x00", 4); |
| 107 | avio_wb32(pb, 0); |
| 108 | mmf->atrpos = avio_tell(pb); |
| 109 | avio_w8(pb, 0); /* format type */ |
| 110 | avio_w8(pb, 0); /* sequence type */ |
| 111 | avio_w8(pb, (mmf->stereo << 7) | (1 << 4) | rate); /* (channel << 7) | (format << 4) | rate */ |
| 112 | avio_w8(pb, 0); /* wave base bit */ |
| 113 | avio_w8(pb, 2); /* time base d */ |
| 114 | avio_w8(pb, 2); /* time base g */ |
| 115 | |
| 116 | ffio_wfourcc(pb, "Atsq"); |
| 117 | avio_wb32(pb, 16); |
| 118 | mmf->atsqpos = avio_tell(pb); |
| 119 | /* Will be filled on close */ |
| 120 | avio_write(pb, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 16); |
| 121 | |
| 122 | mmf->awapos = ff_start_tag(pb, "Awa\x01"); |
| 123 | |
| 124 | avpriv_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codec->sample_rate); |
| 125 | |
| 126 | avio_flush(pb); |
| 127 | |
| 128 | return 0; |
| 129 | } |
| 130 | |
| 131 | /* Write a variable-length symbol */ |
| 132 | static void put_varlength(AVIOContext *pb, int val) |
| 133 | { |
| 134 | if (val < 128) |
| 135 | avio_w8(pb, val); |
| 136 | else { |
| 137 | val -= 128; |
| 138 | avio_w8(pb, 0x80 | val >> 7); |
| 139 | avio_w8(pb, 0x7f & val); |
| 140 | } |
| 141 | } |
| 142 | |
| 143 | static int mmf_write_trailer(AVFormatContext *s) |
| 144 | { |
| 145 | AVIOContext *pb = s->pb; |
| 146 | MMFContext *mmf = s->priv_data; |
| 147 | int64_t pos, size; |
| 148 | int gatetime; |
| 149 | |
| 150 | if (s->pb->seekable) { |
| 151 | /* Fill in length fields */ |
| 152 | end_tag_be(pb, mmf->awapos); |
| 153 | end_tag_be(pb, mmf->atrpos); |
| 154 | end_tag_be(pb, 8); |
| 155 | |
| 156 | pos = avio_tell(pb); |
| 157 | size = pos - mmf->awapos; |
| 158 | |
| 159 | /* Fill Atsq chunk */ |
| 160 | avio_seek(pb, mmf->atsqpos, SEEK_SET); |
| 161 | |
| 162 | /* "play wav" */ |
| 163 | avio_w8(pb, 0); /* start time */ |
| 164 | avio_w8(pb, (mmf->stereo << 6) | 1); /* (channel << 6) | wavenum */ |
| 165 | gatetime = size * 500 / s->streams[0]->codec->sample_rate; |
| 166 | put_varlength(pb, gatetime); /* duration */ |
| 167 | |
| 168 | /* "nop" */ |
| 169 | put_varlength(pb, gatetime); /* start time */ |
| 170 | avio_write(pb, "\xff\x00", 2); /* nop */ |
| 171 | |
| 172 | /* "end of sequence" */ |
| 173 | avio_write(pb, "\x00\x00\x00\x00", 4); |
| 174 | |
| 175 | avio_seek(pb, pos, SEEK_SET); |
| 176 | |
| 177 | avio_flush(pb); |
| 178 | } |
| 179 | return 0; |
| 180 | } |
| 181 | #endif /* CONFIG_MMF_MUXER */ |
| 182 | |
| 183 | static int mmf_probe(AVProbeData *p) |
| 184 | { |
| 185 | /* check file header */ |
| 186 | if (p->buf[0] == 'M' && p->buf[1] == 'M' && |
| 187 | p->buf[2] == 'M' && p->buf[3] == 'D' && |
| 188 | p->buf[8] == 'C' && p->buf[9] == 'N' && |
| 189 | p->buf[10] == 'T' && p->buf[11] == 'I') |
| 190 | return AVPROBE_SCORE_MAX; |
| 191 | else |
| 192 | return 0; |
| 193 | } |
| 194 | |
| 195 | /* mmf input */ |
| 196 | static int mmf_read_header(AVFormatContext *s) |
| 197 | { |
| 198 | MMFContext *mmf = s->priv_data; |
| 199 | unsigned int tag; |
| 200 | AVIOContext *pb = s->pb; |
| 201 | AVStream *st; |
| 202 | int64_t size; |
| 203 | int rate, params; |
| 204 | |
| 205 | tag = avio_rl32(pb); |
| 206 | if (tag != MKTAG('M', 'M', 'M', 'D')) |
| 207 | return AVERROR_INVALIDDATA; |
| 208 | avio_skip(pb, 4); /* file_size */ |
| 209 | |
| 210 | /* Skip some unused chunks that may or may not be present */ |
| 211 | for (;; avio_skip(pb, size)) { |
| 212 | tag = avio_rl32(pb); |
| 213 | size = avio_rb32(pb); |
| 214 | if (tag == MKTAG('C', 'N', 'T', 'I')) |
| 215 | continue; |
| 216 | if (tag == MKTAG('O', 'P', 'D', 'A')) |
| 217 | continue; |
| 218 | break; |
| 219 | } |
| 220 | |
| 221 | /* Tag = "ATRx", where "x" = track number */ |
| 222 | if ((tag & 0xffffff) == MKTAG('M', 'T', 'R', 0)) { |
| 223 | av_log(s, AV_LOG_ERROR, "MIDI like format found, unsupported\n"); |
| 224 | return AVERROR_PATCHWELCOME; |
| 225 | } |
| 226 | if ((tag & 0xffffff) != MKTAG('A', 'T', 'R', 0)) { |
| 227 | av_log(s, AV_LOG_ERROR, "Unsupported SMAF chunk %08x\n", tag); |
| 228 | return AVERROR_PATCHWELCOME; |
| 229 | } |
| 230 | |
| 231 | avio_r8(pb); /* format type */ |
| 232 | avio_r8(pb); /* sequence type */ |
| 233 | params = avio_r8(pb); /* (channel << 7) | (format << 4) | rate */ |
| 234 | rate = mmf_rate(params & 0x0f); |
| 235 | if (rate < 0) { |
| 236 | av_log(s, AV_LOG_ERROR, "Invalid sample rate\n"); |
| 237 | return AVERROR_INVALIDDATA; |
| 238 | } |
| 239 | avio_r8(pb); /* wave base bit */ |
| 240 | avio_r8(pb); /* time base d */ |
| 241 | avio_r8(pb); /* time base g */ |
| 242 | |
| 243 | /* Skip some unused chunks that may or may not be present */ |
| 244 | for (;; avio_skip(pb, size)) { |
| 245 | tag = avio_rl32(pb); |
| 246 | size = avio_rb32(pb); |
| 247 | if (tag == MKTAG('A', 't', 's', 'q')) |
| 248 | continue; |
| 249 | if (tag == MKTAG('A', 's', 'p', 'I')) |
| 250 | continue; |
| 251 | break; |
| 252 | } |
| 253 | |
| 254 | /* Make sure it's followed by an Awa chunk, aka wave data */ |
| 255 | if ((tag & 0xffffff) != MKTAG('A', 'w', 'a', 0)) { |
| 256 | av_log(s, AV_LOG_ERROR, "Unexpected SMAF chunk %08x\n", tag); |
| 257 | return AVERROR_INVALIDDATA; |
| 258 | } |
| 259 | mmf->data_end = avio_tell(pb) + size; |
| 260 | |
| 261 | st = avformat_new_stream(s, NULL); |
| 262 | if (!st) |
| 263 | return AVERROR(ENOMEM); |
| 264 | |
| 265 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
| 266 | st->codec->codec_id = AV_CODEC_ID_ADPCM_YAMAHA; |
| 267 | st->codec->sample_rate = rate; |
| 268 | st->codec->channels = (params >> 7) + 1; |
| 269 | st->codec->channel_layout = params >> 7 ? AV_CH_LAYOUT_STEREO : AV_CH_LAYOUT_MONO; |
| 270 | st->codec->bits_per_coded_sample = 4; |
| 271 | st->codec->bit_rate = st->codec->sample_rate * |
| 272 | st->codec->bits_per_coded_sample; |
| 273 | |
| 274 | avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate); |
| 275 | |
| 276 | return 0; |
| 277 | } |
| 278 | |
| 279 | #define MAX_SIZE 4096 |
| 280 | |
| 281 | static int mmf_read_packet(AVFormatContext *s, AVPacket *pkt) |
| 282 | { |
| 283 | MMFContext *mmf = s->priv_data; |
| 284 | int64_t left, size; |
| 285 | int ret; |
| 286 | |
| 287 | left = mmf->data_end - avio_tell(s->pb); |
| 288 | size = FFMIN(left, MAX_SIZE); |
| 289 | if (avio_feof(s->pb) || size <= 0) |
| 290 | return AVERROR_EOF; |
| 291 | |
| 292 | ret = av_get_packet(s->pb, pkt, size); |
| 293 | if (ret < 0) |
| 294 | return ret; |
| 295 | |
| 296 | pkt->stream_index = 0; |
| 297 | |
| 298 | return ret; |
| 299 | } |
| 300 | |
| 301 | #if CONFIG_MMF_DEMUXER |
| 302 | AVInputFormat ff_mmf_demuxer = { |
| 303 | .name = "mmf", |
| 304 | .long_name = NULL_IF_CONFIG_SMALL("Yamaha SMAF"), |
| 305 | .priv_data_size = sizeof(MMFContext), |
| 306 | .read_probe = mmf_probe, |
| 307 | .read_header = mmf_read_header, |
| 308 | .read_packet = mmf_read_packet, |
| 309 | .flags = AVFMT_GENERIC_INDEX, |
| 310 | }; |
| 311 | #endif |
| 312 | |
| 313 | #if CONFIG_MMF_MUXER |
| 314 | AVOutputFormat ff_mmf_muxer = { |
| 315 | .name = "mmf", |
| 316 | .long_name = NULL_IF_CONFIG_SMALL("Yamaha SMAF"), |
| 317 | .mime_type = "application/vnd.smaf", |
| 318 | .extensions = "mmf", |
| 319 | .priv_data_size = sizeof(MMFContext), |
| 320 | .audio_codec = AV_CODEC_ID_ADPCM_YAMAHA, |
| 321 | .video_codec = AV_CODEC_ID_NONE, |
| 322 | .write_header = mmf_write_header, |
| 323 | .write_packet = ff_raw_write_packet, |
| 324 | .write_trailer = mmf_write_trailer, |
| 325 | }; |
| 326 | #endif |