libavformat/wav.c

   1 /*
   2  * WAV muxer and demuxer
   3  * Copyright (c) 2001, 2002 Fabrice Bellard
   4  *
   5  * Sony Wave64 demuxer
   6  * Copyright (c) 2009 Daniel Verkamp
   7  *
   8  * This file is part of FFmpeg.
   9  *
  10  * FFmpeg is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU Lesser General Public
  12  * License as published by the Free Software Foundation; either
  13  * version 2.1 of the License, or (at your option) any later version.
  14  *
  15  * FFmpeg is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * Lesser General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU Lesser General Public
  21  * License along with FFmpeg; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  23  */
  24 #include "avformat.h"
  25 #include "raw.h"
  26 #include "riff.h"
  27
  28 typedef struct {
  29     int64_t data;
  30     int64_t data_end;
  31     int64_t minpts;
  32     int64_t maxpts;
  33     int last_duration;
  34     int w64;
  35 } WAVContext;
  36
  37 #if CONFIG_WAV_MUXER
  38 static int wav_write_header(AVFormatContext *s)
  39 {
  40     WAVContext *wav = s->priv_data;
  41     ByteIOContext *pb = s->pb;
  42     int64_t fmt, fact;
  43
  44     put_tag(pb, "RIFF");
  45     put_le32(pb, 0); /* file length */
  46     put_tag(pb, "WAVE");
  47
  48     /* format header */
  49     fmt = ff_start_tag(pb, "fmt ");
  50     if (ff_put_wav_header(pb, s->streams[0]->codec) < 0) {
  51         av_log(s, AV_LOG_ERROR, "%s codec not supported in WAVE format\n",
  52                s->streams[0]->codec->codec ? s->streams[0]->codec->codec->name : "NONE");
  53         av_free(wav);
  54         return -1;
  55     }
  56     ff_end_tag(pb, fmt);
  57
  58     if (s->streams[0]->codec->codec_tag != 0x01 /* hence for all other than PCM */
  59         && !url_is_streamed(s->pb)) {
  60         fact = ff_start_tag(pb, "fact");
  61         put_le32(pb, 0);
  62         ff_end_tag(pb, fact);
  63     }
  64
  65     av_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codec->sample_rate);
  66     wav->maxpts = wav->last_duration = 0;
  67     wav->minpts = INT64_MAX;
  68
  69     /* data header */
  70     wav->data = ff_start_tag(pb, "data");
  71
  72     put_flush_packet(pb);
  73
  74     return 0;
  75 }
  76
  77 static int wav_write_packet(AVFormatContext *s, AVPacket *pkt)
  78 {
  79     ByteIOContext *pb  = s->pb;
  80     WAVContext    *wav = s->priv_data;
  81     put_buffer(pb, pkt->data, pkt->size);
  82     if(pkt->pts != AV_NOPTS_VALUE) {
  83         wav->minpts        = FFMIN(wav->minpts, pkt->pts);
  84         wav->maxpts        = FFMAX(wav->maxpts, pkt->pts);
  85         wav->last_duration = pkt->duration;
  86     } else
  87         av_log(s, AV_LOG_ERROR, "wav_write_packet: NOPTS\n");
  88     return 0;
  89 }
  90
  91 static int wav_write_trailer(AVFormatContext *s)
  92 {
  93     ByteIOContext *pb  = s->pb;
  94     WAVContext    *wav = s->priv_data;
  95     int64_t file_size;
  96
  97     if (!url_is_streamed(s->pb)) {
  98         ff_end_tag(pb, wav->data);
  99
 100         /* update file size */
 101         file_size = url_ftell(pb);
 102         url_fseek(pb, 4, SEEK_SET);
 103         put_le32(pb, (uint32_t)(file_size - 8));
 104         url_fseek(pb, file_size, SEEK_SET);
 105
 106         put_flush_packet(pb);
 107
 108         if(s->streams[0]->codec->codec_tag != 0x01) {
 109             /* Update num_samps in fact chunk */
 110             int number_of_samples;
 111             number_of_samples = av_rescale(wav->maxpts - wav->minpts + wav->last_duration,
 112                                            s->streams[0]->codec->sample_rate * (int64_t)s->streams[0]->time_base.num,
 113                                            s->streams[0]->time_base.den);
 114             url_fseek(pb, wav->data-12, SEEK_SET);
 115             put_le32(pb, number_of_samples);
 116             url_fseek(pb, file_size, SEEK_SET);
 117             put_flush_packet(pb);
 118         }
 119     }
 120     return 0;
 121 }
 122 #endif /* CONFIG_WAV_MUXER */
 123
 124 /* return the size of the found tag */
 125 static int64_t find_tag(ByteIOContext *pb, uint32_t tag1)
 126 {
 127     unsigned int tag;
 128     int64_t size;
 129
 130     for (;;) {
 131         if (url_feof(pb))
 132             return -1;
 133         tag  = get_le32(pb);
 134         size = get_le32(pb);
 135         if (tag == tag1)
 136             break;
 137         url_fseek(pb, size, SEEK_CUR);
 138     }
 139     return size;
 140 }
 141
 142 static int wav_probe(AVProbeData *p)
 143 {
 144     /* check file header */
 145     if (p->buf_size <= 32)
 146         return 0;
 147     if (p->buf[ 0] == 'R' && p->buf[ 1] == 'I' &&
 148         p->buf[ 2] == 'F' && p->buf[ 3] == 'F' &&
 149         p->buf[ 8] == 'W' && p->buf[ 9] == 'A' &&
 150         p->buf[10] == 'V' && p->buf[11] == 'E')
 151         /*
 152           Since ACT demuxer has standard WAV header at top of it's own,
 153           returning score is decreased to avoid probe conflict
 154           between ACT and WAV.
 155         */
 156         return AVPROBE_SCORE_MAX - 1;
 157     else
 158         return 0;
 159 }
 160
 161 /* wav input */
 162 static int wav_read_header(AVFormatContext *s,
 163                            AVFormatParameters *ap)
 164 {
 165     int64_t size;
 166     unsigned int tag;
 167     ByteIOContext *pb = s->pb;
 168     AVStream *st;
 169     WAVContext *wav = s->priv_data;
 170
 171     /* check RIFF header */
 172     tag = get_le32(pb);
 173
 174     if (tag != MKTAG('R', 'I', 'F', 'F'))
 175         return -1;
 176     get_le32(pb); /* file size */
 177     tag = get_le32(pb);
 178     if (tag != MKTAG('W', 'A', 'V', 'E'))
 179         return -1;
 180
 181     /* parse fmt header */
 182     size = find_tag(pb, MKTAG('f', 'm', 't', ' '));
 183     if (size < 0)
 184         return -1;
 185     st = av_new_stream(s, 0);
 186     if (!st)
 187         return AVERROR(ENOMEM);
 188
 189     ff_get_wav_header(pb, st->codec, size);
 190     st->need_parsing = AVSTREAM_PARSE_FULL;
 191
 192     av_set_pts_info(st, 64, 1, st->codec->sample_rate);
 193
 194     size = find_tag(pb, MKTAG('d', 'a', 't', 'a'));
 195     if (size < 0)
 196         return -1;
 197     wav->data_end= url_ftell(pb) + size;
 198     return 0;
 199 }
 200
 201 #if CONFIG_W64_DEMUXER
 202
 203 static const uint8_t guid_riff[16] = { 'r', 'i', 'f', 'f',
 204     0x2E, 0x91, 0xCF, 0x11, 0xA5, 0xD6, 0x28, 0xDB, 0x04, 0xC1, 0x00, 0x00 };
 205
 206 static const uint8_t guid_wave[16] = { 'w', 'a', 'v', 'e',
 207     0xF3, 0xAC, 0xD3, 0x11, 0x8C, 0xD1, 0x00, 0xC0, 0x4F, 0x8E, 0xDB, 0x8A };
 208
 209 static const uint8_t guid_fmt [16] = { 'f', 'm', 't', ' ',
 210     0xF3, 0xAC, 0xD3, 0x11, 0x8C, 0xD1, 0x00, 0xC0, 0x4F, 0x8E, 0xDB, 0x8A };
 211
 212 static const uint8_t guid_data[16] = { 'd', 'a', 't', 'a',
 213     0xF3, 0xAC, 0xD3, 0x11, 0x8C, 0xD1, 0x00, 0xC0, 0x4F, 0x8E, 0xDB, 0x8A };
 214
 215 static int w64_probe(AVProbeData *p)
 216 {
 217     if (p->buf_size <= 40)
 218         return 0;
 219     if (!memcmp(p->buf,      guid_riff, 16) &&
 220         !memcmp(p->buf + 24, guid_wave, 16))
 221         return AVPROBE_SCORE_MAX;
 222     else
 223         return 0;
 224 }
 225
 226 /** Find chunk with w64 GUID by skipping over other chunks
 227  * @return the size of the found chunk
 228  */
 229 static int64_t find_guid(ByteIOContext *pb, const uint8_t guid1[16])
 230 {
 231     uint8_t guid[16];
 232     int64_t size;
 233
 234     while (!url_feof(pb)) {
 235         get_buffer(pb, guid, 16);
 236         size = get_le64(pb);
 237         if (size <= 24)
 238             return -1;
 239         if (!memcmp(guid, guid1, 16))
 240             return size;
 241         url_fskip(pb, FFALIGN(size, INT64_C(8)) - 24);
 242     }
 243     return -1;
 244 }
 245
 246 static int w64_read_header(AVFormatContext *s, AVFormatParameters *ap)
 247 {
 248     int64_t size;
 249     ByteIOContext *pb  = s->pb;
 250     WAVContext    *wav = s->priv_data;
 251     AVStream *st;
 252     uint8_t guid[16];
 253
 254     get_buffer(pb, guid, 16);
 255     if (memcmp(guid, guid_riff, 16))
 256         return -1;
 257
 258     if (get_le64(pb) < 16 + 8 + 16 + 8 + 16 + 8) /* riff + wave + fmt + sizes */
 259         return -1;
 260
 261     get_buffer(pb, guid, 16);
 262     if (memcmp(guid, guid_wave, 16)) {
 263         av_log(s, AV_LOG_ERROR, "could not find wave guid\n");
 264         return -1;
 265     }
 266
 267     size = find_guid(pb, guid_fmt);
 268     if (size < 0) {
 269         av_log(s, AV_LOG_ERROR, "could not find fmt guid\n");
 270         return -1;
 271     }
 272
 273     st = av_new_stream(s, 0);
 274     if (!st)
 275         return AVERROR(ENOMEM);
 276
 277     /* subtract chunk header size - normal wav file doesn't count it */
 278     ff_get_wav_header(pb, st->codec, size - 24);
 279     url_fskip(pb, FFALIGN(size, INT64_C(8)) - size);
 280
 281     st->need_parsing = AVSTREAM_PARSE_FULL;
 282
 283     av_set_pts_info(st, 64, 1, st->codec->sample_rate);
 284
 285     size = find_guid(pb, guid_data);
 286     if (size < 0) {
 287         av_log(s, AV_LOG_ERROR, "could not find data guid\n");
 288         return -1;
 289     }
 290     wav->data_end = url_ftell(pb) + size - 24;
 291     wav->w64      = 1;
 292
 293     return 0;
 294 }
 295 #endif /* CONFIG_W64_DEMUXER */
 296
 297 #define MAX_SIZE 4096
 298
 299 static int wav_read_packet(AVFormatContext *s,
 300                            AVPacket *pkt)
 301 {
 302     int ret, size;
 303     int64_t left;
 304     AVStream *st;
 305     WAVContext *wav = s->priv_data;
 306
 307     if (url_feof(s->pb))
 308         return AVERROR(EIO);
 309     st = s->streams[0];
 310
 311     left = wav->data_end - url_ftell(s->pb);
 312     if (left <= 0){
 313         if (CONFIG_W64_DEMUXER && wav->w64)
 314             left = find_guid(s->pb, guid_data) - 24;
 315         else
 316             left = find_tag(s->pb, MKTAG('d', 'a', 't', 'a'));
 317         if (left < 0)
 318             return AVERROR(EIO);
 319         wav->data_end= url_ftell(s->pb) + left;
 320     }
 321
 322     size = MAX_SIZE;
 323     if (st->codec->block_align > 1) {
 324         if (size < st->codec->block_align)
 325             size = st->codec->block_align;
 326         size = (size / st->codec->block_align) * st->codec->block_align;
 327     }
 328     size = FFMIN(size, left);
 329     ret  = av_get_packet(s->pb, pkt, size);
 330     if (ret <= 0)
 331         return AVERROR(EIO);
 332     pkt->stream_index = 0;
 333
 334     /* note: we need to modify the packet size here to handle the last
 335        packet */
 336     pkt->size = ret;
 337     return ret;
 338 }
 339
 340 static int wav_read_seek(AVFormatContext *s,
 341                          int stream_index, int64_t timestamp, int flags)
 342 {
 343     AVStream *st;
 344
 345     st = s->streams[0];
 346     switch (st->codec->codec_id) {
 347     case CODEC_ID_MP2:
 348     case CODEC_ID_MP3:
 349     case CODEC_ID_AC3:
 350     case CODEC_ID_DTS:
 351         /* use generic seeking with dynamically generated indexes */
 352         return -1;
 353     default:
 354         break;
 355     }
 356     return pcm_read_seek(s, stream_index, timestamp, flags);
 357 }
 358
 359 #if CONFIG_WAV_DEMUXER
 360 AVInputFormat wav_demuxer = {
 361     "wav",
 362     NULL_IF_CONFIG_SMALL("WAV format"),
 363     sizeof(WAVContext),
 364     wav_probe,
 365     wav_read_header,
 366     wav_read_packet,
 367     NULL,
 368     wav_read_seek,
 369     .flags= AVFMT_GENERIC_INDEX,
 370     .codec_tag= (const AVCodecTag* const []){ff_codec_wav_tags, 0},
 371 };
 372 #endif
 373
 374 #if CONFIG_WAV_MUXER
 375 AVOutputFormat wav_muxer = {
 376     "wav",
 377     NULL_IF_CONFIG_SMALL("WAV format"),
 378     "audio/x-wav",
 379     "wav",
 380     sizeof(WAVContext),
 381     CODEC_ID_PCM_S16LE,
 382     CODEC_ID_NONE,
 383     wav_write_header,
 384     wav_write_packet,
 385     wav_write_trailer,
 386     .codec_tag= (const AVCodecTag* const []){ff_codec_wav_tags, 0},
 387 };
 388 #endif
 389
 390 #if CONFIG_W64_DEMUXER
 391 AVInputFormat w64_demuxer = {
 392     "w64",
 393     NULL_IF_CONFIG_SMALL("Sony Wave64 format"),
 394     sizeof(WAVContext),
 395     w64_probe,
 396     w64_read_header,
 397     wav_read_packet,
 398     NULL,
 399     wav_read_seek,
 400     .flags = AVFMT_GENERIC_INDEX,
 401     .codec_tag = (const AVCodecTag* const []){ff_codec_wav_tags, 0},
 402 };
 403 #endif