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 "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 MMFContext {
  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]->codecpar->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]->codecpar->sample_rate);
  80         return AVERROR(EINVAL);
  81     }
  82
  83     mmf->stereo = s->streams[0]->codecpar->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]->codecpar->sample_rate);
 125
 126     return 0;
 127 }
 128
 129 /* Write a variable-length symbol */
 130 static void put_varlength(AVIOContext *pb, int val)
 131 {
 132     if (val < 128)
 133         avio_w8(pb, val);
 134     else {
 135         val -= 128;
 136         avio_w8(pb, 0x80 | val >> 7);
 137         avio_w8(pb, 0x7f & val);
 138     }
 139 }
 140
 141 static int mmf_write_trailer(AVFormatContext *s)
 142 {
 143     AVIOContext *pb = s->pb;
 144     MMFContext *mmf = s->priv_data;
 145     int64_t pos, size;
 146     int gatetime;
 147
 148     if (s->pb->seekable & AVIO_SEEKABLE_NORMAL) {
 149         /* Fill in length fields */
 150         end_tag_be(pb, mmf->awapos);
 151         end_tag_be(pb, mmf->atrpos);
 152         end_tag_be(pb, 8);
 153
 154         pos  = avio_tell(pb);
 155         size = pos - mmf->awapos;
 156
 157         /* Fill Atsq chunk */
 158         avio_seek(pb, mmf->atsqpos, SEEK_SET);
 159
 160         /* "play wav" */
 161         avio_w8(pb, 0); /* start time */
 162         avio_w8(pb, (mmf->stereo << 6) | 1); /* (channel << 6) | wavenum */
 163         gatetime = size * 500 / s->streams[0]->codecpar->sample_rate;
 164         put_varlength(pb, gatetime); /* duration */
 165
 166         /* "nop" */
 167         put_varlength(pb, gatetime); /* start time */
 168         avio_write(pb, "\xff\x00", 2); /* nop */
 169
 170         /* "end of sequence" */
 171         avio_write(pb, "\x00\x00\x00\x00", 4);
 172
 173         avio_seek(pb, pos, SEEK_SET);
 174     }
 175     return 0;
 176 }
 177 #endif /* CONFIG_MMF_MUXER */
 178
 179 static int mmf_probe(const AVProbeData *p)
 180 {
 181     /* check file header */
 182     if (p->buf[0] == 'M' && p->buf[1] == 'M' &&
 183         p->buf[2] == 'M' && p->buf[3] == 'D' &&
 184         p->buf[8] == 'C' && p->buf[9] == 'N' &&
 185         p->buf[10] == 'T' && p->buf[11] == 'I')
 186         return AVPROBE_SCORE_MAX;
 187     else
 188         return 0;
 189 }
 190
 191 /* mmf input */
 192 static int mmf_read_header(AVFormatContext *s)
 193 {
 194     MMFContext *mmf = s->priv_data;
 195     unsigned int tag;
 196     AVIOContext *pb = s->pb;
 197     AVStream *st;
 198     int64_t size;
 199     int rate, params;
 200
 201     tag = avio_rl32(pb);
 202     if (tag != MKTAG('M', 'M', 'M', 'D'))
 203         return AVERROR_INVALIDDATA;
 204     avio_skip(pb, 4); /* file_size */
 205
 206     /* Skip some unused chunks that may or may not be present */
 207     for (;; avio_skip(pb, size)) {
 208         tag  = avio_rl32(pb);
 209         size = avio_rb32(pb);
 210         if (tag == MKTAG('C', 'N', 'T', 'I'))
 211             continue;
 212         if (tag == MKTAG('O', 'P', 'D', 'A'))
 213             continue;
 214         break;
 215     }
 216
 217     /* Tag = "ATRx", where "x" = track number */
 218     if ((tag & 0xffffff) == MKTAG('M', 'T', 'R', 0)) {
 219         av_log(s, AV_LOG_ERROR, "MIDI like format found, unsupported\n");
 220         return AVERROR_PATCHWELCOME;
 221     }
 222     if ((tag & 0xffffff) != MKTAG('A', 'T', 'R', 0)) {
 223         av_log(s, AV_LOG_ERROR, "Unsupported SMAF chunk %08x\n", tag);
 224         return AVERROR_PATCHWELCOME;
 225     }
 226
 227     avio_r8(pb); /* format type */
 228     avio_r8(pb); /* sequence type */
 229     params = avio_r8(pb); /* (channel << 7) | (format << 4) | rate */
 230     rate   = mmf_rate(params & 0x0f);
 231     if (rate < 0) {
 232         av_log(s, AV_LOG_ERROR, "Invalid sample rate\n");
 233         return AVERROR_INVALIDDATA;
 234     }
 235     avio_r8(pb); /* wave base bit */
 236     avio_r8(pb); /* time base d */
 237     avio_r8(pb); /* time base g */
 238
 239     /* Skip some unused chunks that may or may not be present */
 240     for (;; avio_skip(pb, size)) {
 241         tag  = avio_rl32(pb);
 242         size = avio_rb32(pb);
 243         if (tag == MKTAG('A', 't', 's', 'q'))
 244             continue;
 245         if (tag == MKTAG('A', 's', 'p', 'I'))
 246             continue;
 247         break;
 248     }
 249
 250     /* Make sure it's followed by an Awa chunk, aka wave data */
 251     if ((tag & 0xffffff) != MKTAG('A', 'w', 'a', 0)) {
 252         av_log(s, AV_LOG_ERROR, "Unexpected SMAF chunk %08x\n", tag);
 253         return AVERROR_INVALIDDATA;
 254     }
 255     mmf->data_end = avio_tell(pb) + size;
 256
 257     st = avformat_new_stream(s, NULL);
 258     if (!st)
 259         return AVERROR(ENOMEM);
 260
 261     st->codecpar->codec_type            = AVMEDIA_TYPE_AUDIO;
 262     st->codecpar->codec_id              = AV_CODEC_ID_ADPCM_YAMAHA;
 263     st->codecpar->sample_rate           = rate;
 264     st->codecpar->channels              = (params >> 7) + 1;
 265     st->codecpar->channel_layout        = params >> 7 ? AV_CH_LAYOUT_STEREO : AV_CH_LAYOUT_MONO;
 266     st->codecpar->bits_per_coded_sample = 4;
 267     st->codecpar->bit_rate              = st->codecpar->sample_rate *
 268                                           st->codecpar->bits_per_coded_sample;
 269
 270     avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
 271
 272     return 0;
 273 }
 274
 275 #define MAX_SIZE 4096
 276
 277 static int mmf_read_packet(AVFormatContext *s, AVPacket *pkt)
 278 {
 279     MMFContext *mmf = s->priv_data;
 280     int64_t left, size;
 281     int ret;
 282
 283     left = mmf->data_end - avio_tell(s->pb);
 284     size = FFMIN(left, MAX_SIZE);
 285     if (avio_feof(s->pb) || size <= 0)
 286         return AVERROR_EOF;
 287
 288     ret = av_get_packet(s->pb, pkt, size);
 289     if (ret < 0)
 290         return ret;
 291
 292     pkt->stream_index = 0;
 293
 294     return ret;
 295 }
 296
 297 #if CONFIG_MMF_DEMUXER
 298 AVInputFormat ff_mmf_demuxer = {
 299     .name           = "mmf",
 300     .long_name      = NULL_IF_CONFIG_SMALL("Yamaha SMAF"),
 301     .priv_data_size = sizeof(MMFContext),
 302     .read_probe     = mmf_probe,
 303     .read_header    = mmf_read_header,
 304     .read_packet    = mmf_read_packet,
 305     .flags          = AVFMT_GENERIC_INDEX,
 306 };
 307 #endif
 308
 309 #if CONFIG_MMF_MUXER
 310 AVOutputFormat ff_mmf_muxer = {
 311     .name           = "mmf",
 312     .long_name      = NULL_IF_CONFIG_SMALL("Yamaha SMAF"),
 313     .mime_type      = "application/vnd.smaf",
 314     .extensions     = "mmf",
 315     .priv_data_size = sizeof(MMFContext),
 316     .audio_codec    = AV_CODEC_ID_ADPCM_YAMAHA,
 317     .video_codec    = AV_CODEC_ID_NONE,
 318     .write_header   = mmf_write_header,
 319     .write_packet   = ff_raw_write_packet,
 320     .write_trailer  = mmf_write_trailer,
 321 };
 322 #endif