libavformat/mmf.c

   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 "config_components.h"
  23
  24 #include "libavutil/channel_layout.h"
  25 #include "avformat.h"
  26 #include "avio_internal.h"
  27 #include "demux.h"
  28 #include "internal.h"
  29 #include "mux.h"
  30 #include "pcm.h"
  31 #include "rawenc.h"
  32 #include "riff.h"
  33 #include "version.h"
  34
  35 typedef struct MMFContext {
  36     int64_t atrpos, atsqpos, awapos;
  37     int64_t data_end;
  38     int stereo;
  39 } MMFContext;
  40
  41 static const int mmf_rates[] = { 4000, 8000, 11025, 22050, 44100 };
  42
  43 static int mmf_rate(int code)
  44 {
  45     if ((code < 0) || (code > 4))
  46         return -1;
  47     return mmf_rates[code];
  48 }
  49
  50 #if CONFIG_MMF_MUXER
  51 static int mmf_rate_code(int rate)
  52 {
  53     int i;
  54     for (i = 0; i < 5; i++)
  55         if (mmf_rates[i] == rate)
  56             return i;
  57     return -1;
  58 }
  59
  60 /* Copy of end_tag() from avienc.c, but for big-endian chunk size */
  61 static void end_tag_be(AVIOContext *pb, int64_t start)
  62 {
  63     int64_t pos;
  64
  65     pos = avio_tell(pb);
  66     avio_seek(pb, start - 4, SEEK_SET);
  67     avio_wb32(pb, (uint32_t)(pos - start));
  68     avio_seek(pb, pos, SEEK_SET);
  69 }
  70
  71 static int mmf_write_header(AVFormatContext *s)
  72 {
  73     MMFContext *mmf = s->priv_data;
  74     AVIOContext *pb = s->pb;
  75     int64_t pos;
  76     int rate;
  77     const char *version = s->flags & AVFMT_FLAG_BITEXACT ?
  78                           "VN:Lavf," :
  79                           "VN:"LIBAVFORMAT_IDENT",";
  80
  81     rate = mmf_rate_code(s->streams[0]->codecpar->sample_rate);
  82     if (rate < 0) {
  83         av_log(s, AV_LOG_ERROR, "Unsupported sample rate %d, supported are 4000, 8000, 11025, 22050 and 44100\n",
  84                s->streams[0]->codecpar->sample_rate);
  85         return AVERROR(EINVAL);
  86     }
  87
  88     mmf->stereo = s->streams[0]->codecpar->ch_layout.nb_channels > 1;
  89     if (mmf->stereo &&
  90         s->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL) {
  91         av_log(s, AV_LOG_ERROR, "Yamaha SMAF stereo is experimental, "
  92                "add '-strict %d' if you want to use it.\n",
  93                FF_COMPLIANCE_EXPERIMENTAL);
  94         return AVERROR(EINVAL);
  95     }
  96
  97     ffio_wfourcc(pb, "MMMD");
  98     avio_wb32(pb, 0);
  99     pos = ff_start_tag(pb, "CNTI");
 100     avio_w8(pb, 0); /* class */
 101     avio_w8(pb, 1); /* type */
 102     avio_w8(pb, 1); /* code type */
 103     avio_w8(pb, 0); /* status */
 104     avio_w8(pb, 0); /* counts */
 105     end_tag_be(pb, pos);
 106
 107     pos = ff_start_tag(pb, "OPDA");
 108     avio_write(pb, version, strlen(version)); /* metadata ("ST:songtitle,VN:version,...") */
 109     end_tag_be(pb, pos);
 110
 111     avio_write(pb, "ATR\x00", 4);
 112     avio_wb32(pb, 0);
 113     mmf->atrpos = avio_tell(pb);
 114     avio_w8(pb, 0); /* format type */
 115     avio_w8(pb, 0); /* sequence type */
 116     avio_w8(pb, (mmf->stereo << 7) | (1 << 4) | rate); /* (channel << 7) | (format << 4) | rate */
 117     avio_w8(pb, 0); /* wave base bit */
 118     avio_w8(pb, 2); /* time base d */
 119     avio_w8(pb, 2); /* time base g */
 120
 121     ffio_wfourcc(pb, "Atsq");
 122     avio_wb32(pb, 16);
 123     mmf->atsqpos = avio_tell(pb);
 124     /* Will be filled on close */
 125     avio_write(pb, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 16);
 126
 127     mmf->awapos = ff_start_tag(pb, "Awa\x01");
 128
 129     avpriv_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codecpar->sample_rate);
 130
 131     return 0;
 132 }
 133
 134 /* Write a variable-length symbol */
 135 static void put_varlength(AVIOContext *pb, int val)
 136 {
 137     if (val < 128)
 138         avio_w8(pb, val);
 139     else {
 140         val -= 128;
 141         avio_w8(pb, 0x80 | val >> 7);
 142         avio_w8(pb, 0x7f & val);
 143     }
 144 }
 145
 146 static int mmf_write_trailer(AVFormatContext *s)
 147 {
 148     AVIOContext *pb = s->pb;
 149     MMFContext *mmf = s->priv_data;
 150     int64_t pos, size;
 151     int gatetime;
 152
 153     if (s->pb->seekable & AVIO_SEEKABLE_NORMAL) {
 154         /* Fill in length fields */
 155         end_tag_be(pb, mmf->awapos);
 156         end_tag_be(pb, mmf->atrpos);
 157         end_tag_be(pb, 8);
 158
 159         pos  = avio_tell(pb);
 160         size = pos - mmf->awapos;
 161
 162         /* Fill Atsq chunk */
 163         avio_seek(pb, mmf->atsqpos, SEEK_SET);
 164
 165         /* "play wav" */
 166         avio_w8(pb, 0); /* start time */
 167         avio_w8(pb, (mmf->stereo << 6) | 1); /* (channel << 6) | wavenum */
 168         gatetime = size * 500 / s->streams[0]->codecpar->sample_rate;
 169         put_varlength(pb, gatetime); /* duration */
 170
 171         /* "nop" */
 172         put_varlength(pb, gatetime); /* start time */
 173         avio_write(pb, "\xff\x00", 2); /* nop */
 174
 175         /* "end of sequence" */
 176         avio_write(pb, "\x00\x00\x00\x00", 4);
 177
 178         avio_seek(pb, pos, SEEK_SET);
 179     }
 180     return 0;
 181 }
 182 #endif /* CONFIG_MMF_MUXER */
 183
 184 static int mmf_probe(const AVProbeData *p)
 185 {
 186     /* check file header */
 187     if (p->buf[0] == 'M' && p->buf[1] == 'M' &&
 188         p->buf[2] == 'M' && p->buf[3] == 'D' &&
 189         p->buf[8] == 'C' && p->buf[9] == 'N' &&
 190         p->buf[10] == 'T' && p->buf[11] == 'I')
 191         return AVPROBE_SCORE_MAX;
 192     else
 193         return 0;
 194 }
 195
 196 /* mmf input */
 197 static int mmf_read_header(AVFormatContext *s)
 198 {
 199     MMFContext *mmf = s->priv_data;
 200     unsigned int tag;
 201     AVIOContext *pb = s->pb;
 202     AVStream *st;
 203     int64_t size;
 204     int rate, params;
 205
 206     tag = avio_rl32(pb);
 207     if (tag != MKTAG('M', 'M', 'M', 'D'))
 208         return AVERROR_INVALIDDATA;
 209     avio_skip(pb, 4); /* file_size */
 210
 211     /* Skip some unused chunks that may or may not be present */
 212     for (;; avio_skip(pb, size)) {
 213         tag  = avio_rl32(pb);
 214         size = avio_rb32(pb);
 215         if (tag == MKTAG('C', 'N', 'T', 'I'))
 216             continue;
 217         if (tag == MKTAG('O', 'P', 'D', 'A'))
 218             continue;
 219         break;
 220     }
 221
 222     /* Tag = "ATRx", where "x" = track number */
 223     if ((tag & 0xffffff) == MKTAG('M', 'T', 'R', 0)) {
 224         av_log(s, AV_LOG_ERROR, "MIDI like format found, unsupported\n");
 225         return AVERROR_PATCHWELCOME;
 226     }
 227     if ((tag & 0xffffff) != MKTAG('A', 'T', 'R', 0)) {
 228         av_log(s, AV_LOG_ERROR, "Unsupported SMAF chunk %08x\n", tag);
 229         return AVERROR_PATCHWELCOME;
 230     }
 231
 232     avio_r8(pb); /* format type */
 233     avio_r8(pb); /* sequence type */
 234     params = avio_r8(pb); /* (channel << 7) | (format << 4) | rate */
 235     rate   = mmf_rate(params & 0x0f);
 236     if (rate < 0) {
 237         av_log(s, AV_LOG_ERROR, "Invalid sample rate\n");
 238         return AVERROR_INVALIDDATA;
 239     }
 240     avio_r8(pb); /* wave base bit */
 241     avio_r8(pb); /* time base d */
 242     avio_r8(pb); /* time base g */
 243
 244     /* Skip some unused chunks that may or may not be present */
 245     for (;; avio_skip(pb, size)) {
 246         tag  = avio_rl32(pb);
 247         size = avio_rb32(pb);
 248         if (tag == MKTAG('A', 't', 's', 'q'))
 249             continue;
 250         if (tag == MKTAG('A', 's', 'p', 'I'))
 251             continue;
 252         break;
 253     }
 254
 255     /* Make sure it's followed by an Awa chunk, aka wave data */
 256     if ((tag & 0xffffff) != MKTAG('A', 'w', 'a', 0)) {
 257         av_log(s, AV_LOG_ERROR, "Unexpected SMAF chunk %08x\n", tag);
 258         return AVERROR_INVALIDDATA;
 259     }
 260     mmf->data_end = avio_tell(pb) + size;
 261
 262     st = avformat_new_stream(s, NULL);
 263     if (!st)
 264         return AVERROR(ENOMEM);
 265
 266     st->codecpar->codec_type            = AVMEDIA_TYPE_AUDIO;
 267     st->codecpar->codec_id              = AV_CODEC_ID_ADPCM_YAMAHA;
 268     st->codecpar->sample_rate           = rate;
 269     av_channel_layout_default(&st->codecpar->ch_layout, (params >> 7) + 1);
 270     st->codecpar->bits_per_coded_sample = 4;
 271     st->codecpar->bit_rate              = st->codecpar->sample_rate *
 272                                           st->codecpar->bits_per_coded_sample;
 273
 274     avpriv_set_pts_info(st, 64, 1, st->codecpar->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 const FFInputFormat ff_mmf_demuxer = {
 303     .p.name         = "mmf",
 304     .p.long_name    = NULL_IF_CONFIG_SMALL("Yamaha SMAF"),
 305     .p.flags        = AVFMT_GENERIC_INDEX,
 306     .priv_data_size = sizeof(MMFContext),
 307     .read_probe     = mmf_probe,
 308     .read_header    = mmf_read_header,
 309     .read_packet    = mmf_read_packet,
 310 };
 311 #endif
 312
 313 #if CONFIG_MMF_MUXER
 314 const FFOutputFormat ff_mmf_muxer = {
 315     .p.name         = "mmf",
 316     .p.long_name    = NULL_IF_CONFIG_SMALL("Yamaha SMAF"),
 317     .p.mime_type    = "application/vnd.smaf",
 318     .p.extensions   = "mmf",
 319     .priv_data_size = sizeof(MMFContext),
 320     .p.audio_codec  = AV_CODEC_ID_ADPCM_YAMAHA,
 321     .p.video_codec  = AV_CODEC_ID_NONE,
 322     .p.subtitle_codec = AV_CODEC_ID_NONE,
 323     .flags_internal   = FF_OFMT_FLAG_MAX_ONE_OF_EACH |
 324                         FF_OFMT_FLAG_ONLY_DEFAULT_CODECS,
 325     .write_header   = mmf_write_header,
 326     .write_packet   = ff_raw_write_packet,
 327     .write_trailer  = mmf_write_trailer,
 328 };
 329 #endif