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
 123 AVOutputFormat wav_muxer = {
 124     "wav",
 125     NULL_IF_CONFIG_SMALL("WAV format"),
 126     "audio/x-wav",
 127     "wav",
 128     sizeof(WAVContext),
 129     CODEC_ID_PCM_S16LE,
 130     CODEC_ID_NONE,
 131     wav_write_header,
 132     wav_write_packet,
 133     wav_write_trailer,
 134     .codec_tag= (const AVCodecTag* const []){ff_codec_wav_tags, 0},
 135 };
 136 #endif /* CONFIG_WAV_MUXER */
 137
 138
 139 #if CONFIG_WAV_DEMUXER
 140 /* return the size of the found tag */
 141 static int64_t find_tag(ByteIOContext *pb, uint32_t tag1)
 142 {
 143     unsigned int tag;
 144     int64_t size;
 145
 146     for (;;) {
 147         if (url_feof(pb))
 148             return -1;
 149         tag  = get_le32(pb);
 150         size = get_le32(pb);
 151         if (tag == tag1)
 152             break;
 153         url_fseek(pb, size, SEEK_CUR);
 154     }
 155     return size;
 156 }
 157
 158 static int wav_probe(AVProbeData *p)
 159 {
 160     /* check file header */
 161     if (p->buf_size <= 32)
 162         return 0;
 163     if (p->buf[ 0] == 'R' && p->buf[ 1] == 'I' &&
 164         p->buf[ 2] == 'F' && p->buf[ 3] == 'F' &&
 165         p->buf[ 8] == 'W' && p->buf[ 9] == 'A' &&
 166         p->buf[10] == 'V' && p->buf[11] == 'E')
 167         /*
 168           Since ACT demuxer has standard WAV header at top of it's own,
 169           returning score is decreased to avoid probe conflict
 170           between ACT and WAV.
 171         */
 172         return AVPROBE_SCORE_MAX - 1;
 173     else
 174         return 0;
 175 }
 176
 177 /* wav input */
 178 static int wav_read_header(AVFormatContext *s,
 179                            AVFormatParameters *ap)
 180 {
 181     int64_t size;
 182     unsigned int tag;
 183     ByteIOContext *pb = s->pb;
 184     AVStream *st;
 185     WAVContext *wav = s->priv_data;
 186
 187     /* check RIFF header */
 188     tag = get_le32(pb);
 189
 190     if (tag != MKTAG('R', 'I', 'F', 'F'))
 191         return -1;
 192     get_le32(pb); /* file size */
 193     tag = get_le32(pb);
 194     if (tag != MKTAG('W', 'A', 'V', 'E'))
 195         return -1;
 196
 197     /* parse fmt header */
 198     size = find_tag(pb, MKTAG('f', 'm', 't', ' '));
 199     if (size < 0)
 200         return -1;
 201     st = av_new_stream(s, 0);
 202     if (!st)
 203         return AVERROR(ENOMEM);
 204
 205     ff_get_wav_header(pb, st->codec, size);
 206     st->need_parsing = AVSTREAM_PARSE_FULL;
 207
 208     av_set_pts_info(st, 64, 1, st->codec->sample_rate);
 209
 210     size = find_tag(pb, MKTAG('d', 'a', 't', 'a'));
 211     if (size < 0)
 212         return -1;
 213     wav->data_end= url_ftell(pb) + size;
 214     return 0;
 215 }
 216
 217 /** Find chunk with w64 GUID by skipping over other chunks
 218  * @return the size of the found chunk
 219  */
 220 static int64_t find_guid(ByteIOContext *pb, const uint8_t guid1[16])
 221 {
 222     uint8_t guid[16];
 223     int64_t size;
 224
 225     while (!url_feof(pb)) {
 226         get_buffer(pb, guid, 16);
 227         size = get_le64(pb);
 228         if (size <= 24)
 229             return -1;
 230         if (!memcmp(guid, guid1, 16))
 231             return size;
 232         url_fskip(pb, FFALIGN(size, INT64_C(8)) - 24);
 233     }
 234     return -1;
 235 }
 236
 237 static const uint8_t guid_data[16] = { 'd', 'a', 't', 'a',
 238     0xF3, 0xAC, 0xD3, 0x11, 0x8C, 0xD1, 0x00, 0xC0, 0x4F, 0x8E, 0xDB, 0x8A };
 239
 240 #define MAX_SIZE 4096
 241
 242 static int wav_read_packet(AVFormatContext *s,
 243                            AVPacket *pkt)
 244 {
 245     int ret, size;
 246     int64_t left;
 247     AVStream *st;
 248     WAVContext *wav = s->priv_data;
 249
 250     st = s->streams[0];
 251
 252     left = wav->data_end - url_ftell(s->pb);
 253     if (left <= 0){
 254         if (CONFIG_W64_DEMUXER && wav->w64)
 255             left = find_guid(s->pb, guid_data) - 24;
 256         else
 257             left = find_tag(s->pb, MKTAG('d', 'a', 't', 'a'));
 258         if (left < 0)
 259             return AVERROR_EOF;
 260         wav->data_end= url_ftell(s->pb) + left;
 261     }
 262
 263     size = MAX_SIZE;
 264     if (st->codec->block_align > 1) {
 265         if (size < st->codec->block_align)
 266             size = st->codec->block_align;
 267         size = (size / st->codec->block_align) * st->codec->block_align;
 268     }
 269     size = FFMIN(size, left);
 270     ret  = av_get_packet(s->pb, pkt, size);
 271     if (ret < 0)
 272         return ret;
 273     pkt->stream_index = 0;
 274
 275     return ret;
 276 }
 277
 278 static int wav_read_seek(AVFormatContext *s,
 279                          int stream_index, int64_t timestamp, int flags)
 280 {
 281     AVStream *st;
 282
 283     st = s->streams[0];
 284     switch (st->codec->codec_id) {
 285     case CODEC_ID_MP2:
 286     case CODEC_ID_MP3:
 287     case CODEC_ID_AC3:
 288     case CODEC_ID_DTS:
 289         /* use generic seeking with dynamically generated indexes */
 290         return -1;
 291     default:
 292         break;
 293     }
 294     return pcm_read_seek(s, stream_index, timestamp, flags);
 295 }
 296
 297 AVInputFormat wav_demuxer = {
 298     "wav",
 299     NULL_IF_CONFIG_SMALL("WAV format"),
 300     sizeof(WAVContext),
 301     wav_probe,
 302     wav_read_header,
 303     wav_read_packet,
 304     NULL,
 305     wav_read_seek,
 306     .flags= AVFMT_GENERIC_INDEX,
 307     .codec_tag= (const AVCodecTag* const []){ff_codec_wav_tags, 0},
 308 };
 309 #endif /* CONFIG_WAV_DEMUXER */
 310
 311
 312 #if CONFIG_W64_DEMUXER
 313 static const uint8_t guid_riff[16] = { 'r', 'i', 'f', 'f',
 314     0x2E, 0x91, 0xCF, 0x11, 0xA5, 0xD6, 0x28, 0xDB, 0x04, 0xC1, 0x00, 0x00 };
 315
 316 static const uint8_t guid_wave[16] = { 'w', 'a', 'v', 'e',
 317     0xF3, 0xAC, 0xD3, 0x11, 0x8C, 0xD1, 0x00, 0xC0, 0x4F, 0x8E, 0xDB, 0x8A };
 318
 319 static const uint8_t guid_fmt [16] = { 'f', 'm', 't', ' ',
 320     0xF3, 0xAC, 0xD3, 0x11, 0x8C, 0xD1, 0x00, 0xC0, 0x4F, 0x8E, 0xDB, 0x8A };
 321
 322 static int w64_probe(AVProbeData *p)
 323 {
 324     if (p->buf_size <= 40)
 325         return 0;
 326     if (!memcmp(p->buf,      guid_riff, 16) &&
 327         !memcmp(p->buf + 24, guid_wave, 16))
 328         return AVPROBE_SCORE_MAX;
 329     else
 330         return 0;
 331 }
 332
 333 static int w64_read_header(AVFormatContext *s, AVFormatParameters *ap)
 334 {
 335     int64_t size;
 336     ByteIOContext *pb  = s->pb;
 337     WAVContext    *wav = s->priv_data;
 338     AVStream *st;
 339     uint8_t guid[16];
 340
 341     get_buffer(pb, guid, 16);
 342     if (memcmp(guid, guid_riff, 16))
 343         return -1;
 344
 345     if (get_le64(pb) < 16 + 8 + 16 + 8 + 16 + 8) /* riff + wave + fmt + sizes */
 346         return -1;
 347
 348     get_buffer(pb, guid, 16);
 349     if (memcmp(guid, guid_wave, 16)) {
 350         av_log(s, AV_LOG_ERROR, "could not find wave guid\n");
 351         return -1;
 352     }
 353
 354     size = find_guid(pb, guid_fmt);
 355     if (size < 0) {
 356         av_log(s, AV_LOG_ERROR, "could not find fmt guid\n");
 357         return -1;
 358     }
 359
 360     st = av_new_stream(s, 0);
 361     if (!st)
 362         return AVERROR(ENOMEM);
 363
 364     /* subtract chunk header size - normal wav file doesn't count it */
 365     ff_get_wav_header(pb, st->codec, size - 24);
 366     url_fskip(pb, FFALIGN(size, INT64_C(8)) - size);
 367
 368     st->need_parsing = AVSTREAM_PARSE_FULL;
 369
 370     av_set_pts_info(st, 64, 1, st->codec->sample_rate);
 371
 372     size = find_guid(pb, guid_data);
 373     if (size < 0) {
 374         av_log(s, AV_LOG_ERROR, "could not find data guid\n");
 375         return -1;
 376     }
 377     wav->data_end = url_ftell(pb) + size - 24;
 378     wav->w64      = 1;
 379
 380     return 0;
 381 }
 382
 383 AVInputFormat w64_demuxer = {
 384     "w64",
 385     NULL_IF_CONFIG_SMALL("Sony Wave64 format"),
 386     sizeof(WAVContext),
 387     w64_probe,
 388     w64_read_header,
 389     wav_read_packet,
 390     NULL,
 391     wav_read_seek,
 392     .flags = AVFMT_GENERIC_INDEX,
 393     .codec_tag = (const AVCodecTag* const []){ff_codec_wav_tags, 0},
 394 };
 395 #endif /* CONFIG_W64_DEMUXER */