git.sesse.net Git - ffmpeg/blob - libavformat/wavenc.c

   1 /*
   2  * WAV muxer
   3  * Copyright (c) 2001, 2002 Fabrice Bellard
   4  *
   5  * Sony Wave64 muxer
   6  * Copyright (c) 2012 Paul B Mahol
   7  *
   8  * WAV muxer RF64 support
   9  * Copyright (c) 2013 Daniel Verkamp <daniel@drv.nu>
  10  *
  11  * EBU Tech 3285 - Supplement 3 - Peak Envelope Chunk encoder
  12  * Copyright (c) 2014 Georg Lippitsch <georg.lippitsch@gmx.at>
  13  *
  14  * This file is part of FFmpeg.
  15  *
  16  * FFmpeg is free software; you can redistribute it and/or
  17  * modify it under the terms of the GNU Lesser General Public
  18  * License as published by the Free Software Foundation; either
  19  * version 2.1 of the License, or (at your option) any later version.
  20  *
  21  * FFmpeg is distributed in the hope that it will be useful,
  22  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  23  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  24  * Lesser General Public License for more details.
  25  *
  26  * You should have received a copy of the GNU Lesser General Public
  27  * License along with FFmpeg; if not, write to the Free Software
  28  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  29  */
  30
  31 #include <stdint.h>
  32 #include <string.h>
  33
  34 #include "libavutil/avstring.h"
  35 #include "libavutil/dict.h"
  36 #include "libavutil/common.h"
  37 #include "libavutil/intreadwrite.h"
  38 #include "libavutil/mathematics.h"
  39 #include "libavutil/opt.h"
  40 #include "libavutil/time.h"
  41 #include "libavutil/time_internal.h"
  42
  43 #include "avformat.h"
  44 #include "avio.h"
  45 #include "avio_internal.h"
  46 #include "internal.h"
  47 #include "riff.h"
  48
  49 #define RF64_AUTO   (-1)
  50 #define RF64_NEVER  0
  51 #define RF64_ALWAYS 1
  52
  53 #define PEAK_BUFFER_SIZE   1024
  54
  55 typedef enum {
  56     PEAK_OFF = 0,
  57     PEAK_ON,
  58     PEAK_ONLY
  59 } PeakType;
  60
  61 typedef enum {
  62     PEAK_FORMAT_UINT8 = 1,
  63     PEAK_FORMAT_UINT16
  64 } PeakFormat;
  65
  66 typedef struct WAVMuxContext {
  67     const AVClass *class;
  68     int64_t data;
  69     int64_t fact_pos;
  70     int64_t ds64;
  71     int64_t minpts;
  72     int64_t maxpts;
  73     int16_t *peak_maxpos, *peak_maxneg;
  74     uint32_t peak_num_frames;
  75     uint32_t peak_outbuf_size;
  76     uint32_t peak_outbuf_bytes;
  77     uint32_t peak_pos_pop;
  78     uint16_t peak_pop;
  79     uint8_t *peak_output;
  80     int last_duration;
  81     int write_bext;
  82     int write_peak;
  83     int rf64;
  84     int peak_block_size;
  85     PeakFormat peak_format;
  86     int peak_block_pos;
  87     int peak_ppv;
  88     int peak_bps;
  89 } WAVMuxContext;
  90
  91 #if CONFIG_WAV_MUXER
  92 static inline void bwf_write_bext_string(AVFormatContext *s, const char *key, int maxlen)
  93 {
  94     AVDictionaryEntry *tag;
  95     int len = 0;
  96
  97     if (tag = av_dict_get(s->metadata, key, NULL, 0)) {
  98         len = strlen(tag->value);
  99         len = FFMIN(len, maxlen);
 100         avio_write(s->pb, tag->value, len);
 101     }
 102
 103     ffio_fill(s->pb, 0, maxlen - len);
 104 }
 105
 106 static void bwf_write_bext_chunk(AVFormatContext *s)
 107 {
 108     AVDictionaryEntry *tmp_tag;
 109     uint64_t time_reference = 0;
 110     int64_t bext = ff_start_tag(s->pb, "bext");
 111
 112     bwf_write_bext_string(s, "description", 256);
 113     bwf_write_bext_string(s, "originator", 32);
 114     bwf_write_bext_string(s, "originator_reference", 32);
 115     bwf_write_bext_string(s, "origination_date", 10);
 116     bwf_write_bext_string(s, "origination_time", 8);
 117
 118     if (tmp_tag = av_dict_get(s->metadata, "time_reference", NULL, 0))
 119         time_reference = strtoll(tmp_tag->value, NULL, 10);
 120     avio_wl64(s->pb, time_reference);
 121     avio_wl16(s->pb, 1);  // set version to 1
 122
 123     if (tmp_tag = av_dict_get(s->metadata, "umid", NULL, 0)) {
 124         unsigned char umidpart_str[17] = {0};
 125         int i;
 126         uint64_t umidpart;
 127         int len = strlen(tmp_tag->value+2);
 128
 129         for (i = 0; i < len/16; i++) {
 130             memcpy(umidpart_str, tmp_tag->value + 2 + (i*16), 16);
 131             umidpart = strtoll(umidpart_str, NULL, 16);
 132             avio_wb64(s->pb, umidpart);
 133         }
 134         ffio_fill(s->pb, 0, 64 - i*8);
 135     } else
 136         ffio_fill(s->pb, 0, 64); // zero UMID
 137
 138     ffio_fill(s->pb, 0, 190); // Reserved
 139
 140     if (tmp_tag = av_dict_get(s->metadata, "coding_history", NULL, 0))
 141         avio_put_str(s->pb, tmp_tag->value);
 142
 143     ff_end_tag(s->pb, bext);
 144 }
 145
 146 static av_cold void peak_free_buffers(AVFormatContext *s)
 147 {
 148     WAVMuxContext *wav = s->priv_data;
 149
 150     av_freep(&wav->peak_maxpos);
 151     av_freep(&wav->peak_maxneg);
 152     av_freep(&wav->peak_output);
 153 }
 154
 155 static av_cold int peak_init_writer(AVFormatContext *s)
 156 {
 157     WAVMuxContext *wav = s->priv_data;
 158     AVCodecContext *enc = s->streams[0]->codec;
 159
 160     if (enc->codec_id != AV_CODEC_ID_PCM_S8 &&
 161         enc->codec_id != AV_CODEC_ID_PCM_S16LE &&
 162         enc->codec_id != AV_CODEC_ID_PCM_U8 &&
 163         enc->codec_id != AV_CODEC_ID_PCM_U16LE) {
 164         av_log(s, AV_LOG_ERROR, "%s codec not supported for Peak Chunk\n",
 165                s->streams[0]->codec->codec ? s->streams[0]->codec->codec->name : "NONE");
 166         return -1;
 167     }
 168
 169     wav->peak_bps = av_get_bits_per_sample(enc->codec_id) / 8;
 170
 171     if (wav->peak_bps == 1 && wav->peak_format == PEAK_FORMAT_UINT16) {
 172         av_log(s, AV_LOG_ERROR,
 173                "Writing 16 bit peak for 8 bit audio does not make sense\n");
 174         return AVERROR(EINVAL);
 175     }
 176
 177     wav->peak_maxpos = av_mallocz_array(enc->channels, sizeof(*wav->peak_maxpos));
 178     wav->peak_maxneg = av_mallocz_array(enc->channels, sizeof(*wav->peak_maxneg));
 179     wav->peak_output = av_malloc(PEAK_BUFFER_SIZE);
 180     if (!wav->peak_maxpos || !wav->peak_maxneg || !wav->peak_output)
 181         goto nomem;
 182
 183     wav->peak_outbuf_size = PEAK_BUFFER_SIZE;
 184
 185     return 0;
 186
 187 nomem:
 188     av_log(s, AV_LOG_ERROR, "Out of memory\n");
 189     peak_free_buffers(s);
 190     return AVERROR(ENOMEM);
 191 }
 192
 193 static void peak_write_frame(AVFormatContext *s)
 194 {
 195     WAVMuxContext *wav = s->priv_data;
 196     AVCodecContext *enc = s->streams[0]->codec;
 197     int peak_of_peaks;
 198     int c;
 199
 200     if (!wav->peak_output)
 201         return;
 202
 203     for (c = 0; c < enc->channels; c++) {
 204         wav->peak_maxneg[c] = -wav->peak_maxneg[c];
 205
 206         if (wav->peak_bps == 2 && wav->peak_format == PEAK_FORMAT_UINT8) {
 207             wav->peak_maxpos[c] = wav->peak_maxpos[c] / 256;
 208             wav->peak_maxneg[c] = wav->peak_maxneg[c] / 256;
 209         }
 210
 211         if (wav->peak_ppv == 1)
 212             wav->peak_maxpos[c] =
 213                 FFMAX(wav->peak_maxpos[c], wav->peak_maxneg[c]);
 214
 215         peak_of_peaks = FFMAX3(wav->peak_maxpos[c], wav->peak_maxneg[c],
 216                                wav->peak_pop);
 217         if (peak_of_peaks > wav->peak_pop)
 218             wav->peak_pos_pop = wav->peak_num_frames;
 219         wav->peak_pop = peak_of_peaks;
 220
 221         if (wav->peak_outbuf_size - wav->peak_outbuf_bytes <
 222             wav->peak_format * wav->peak_ppv) {
 223             wav->peak_outbuf_size += PEAK_BUFFER_SIZE;
 224             wav->peak_output = av_realloc(wav->peak_output,
 225                                           wav->peak_outbuf_size);
 226             if (!wav->peak_output) {
 227                 av_log(s, AV_LOG_ERROR, "No memory for peak data\n");
 228                 return;
 229             }
 230         }
 231
 232         if (wav->peak_format == PEAK_FORMAT_UINT8) {
 233             wav->peak_output[wav->peak_outbuf_bytes++] =
 234                 wav->peak_maxpos[c];
 235             if (wav->peak_ppv == 2) {
 236                 wav->peak_output[wav->peak_outbuf_bytes++] =
 237                     wav->peak_maxneg[c];
 238             }
 239         } else {
 240             AV_WL16(wav->peak_output + wav->peak_outbuf_bytes,
 241                     wav->peak_maxpos[c]);
 242             wav->peak_outbuf_bytes += 2;
 243             if (wav->peak_ppv == 2) {
 244                 AV_WL16(wav->peak_output + wav->peak_outbuf_bytes,
 245                         wav->peak_maxneg[c]);
 246                 wav->peak_outbuf_bytes += 2;
 247             }
 248         }
 249         wav->peak_maxpos[c] = 0;
 250         wav->peak_maxneg[c] = 0;
 251     }
 252     wav->peak_num_frames++;
 253 }
 254
 255 static void peak_write_chunk(AVFormatContext *s)
 256 {
 257     WAVMuxContext *wav = s->priv_data;
 258     AVIOContext *pb = s->pb;
 259     AVCodecContext *enc = s->streams[0]->codec;
 260     int64_t peak = ff_start_tag(s->pb, "levl");
 261     int64_t now0;
 262     time_t now_secs;
 263     char timestamp[28];
 264
 265     /* Peak frame of incomplete block at end */
 266     if (wav->peak_block_pos)
 267         peak_write_frame(s);
 268
 269     memset(timestamp, 0, sizeof(timestamp));
 270     if (!(s->flags & AVFMT_FLAG_BITEXACT)) {
 271         struct tm tmpbuf;
 272         av_log(s, AV_LOG_INFO, "Writing local time and date to Peak Envelope Chunk\n");
 273         now0 = av_gettime();
 274         now_secs = now0 / 1000000;
 275         strftime(timestamp, sizeof(timestamp), "%Y:%m:%d:%H:%M:%S:", localtime_r(&now_secs, &tmpbuf));
 276         av_strlcatf(timestamp, sizeof(timestamp), "%03d", (int)((now0 / 1000) % 1000));
 277     }
 278
 279     avio_wl32(pb, 1);                           /* version */
 280     avio_wl32(pb, wav->peak_format);            /* 8 or 16 bit */
 281     avio_wl32(pb, wav->peak_ppv);               /* positive and negative */
 282     avio_wl32(pb, wav->peak_block_size);        /* frames per value */
 283     avio_wl32(pb, enc->channels);               /* number of channels */
 284     avio_wl32(pb, wav->peak_num_frames);        /* number of peak frames */
 285     avio_wl32(pb, wav->peak_pos_pop);           /* audio sample frame index */
 286     avio_wl32(pb, 128);                         /* equal to size of header */
 287     avio_write(pb, timestamp, 28);              /* ASCII time stamp */
 288     ffio_fill(pb, 0, 60);
 289
 290     avio_write(pb, wav->peak_output, wav->peak_outbuf_bytes);
 291
 292     ff_end_tag(pb, peak);
 293
 294     if (!wav->data)
 295         wav->data = peak;
 296 }
 297
 298 static int wav_write_header(AVFormatContext *s)
 299 {
 300     WAVMuxContext *wav = s->priv_data;
 301     AVIOContext *pb = s->pb;
 302     int64_t fmt;
 303
 304     if (s->nb_streams != 1) {
 305         av_log(s, AV_LOG_ERROR, "WAVE files have exactly one stream\n");
 306         return AVERROR(EINVAL);
 307     }
 308
 309     if (wav->rf64 == RF64_ALWAYS) {
 310         ffio_wfourcc(pb, "RF64");
 311         avio_wl32(pb, -1); /* RF64 chunk size: use size in ds64 */
 312     } else {
 313         ffio_wfourcc(pb, "RIFF");
 314         avio_wl32(pb, -1); /* file length */
 315     }
 316
 317     ffio_wfourcc(pb, "WAVE");
 318
 319     if (wav->rf64 != RF64_NEVER) {
 320         /* write empty ds64 chunk or JUNK chunk to reserve space for ds64 */
 321         ffio_wfourcc(pb, wav->rf64 == RF64_ALWAYS ? "ds64" : "JUNK");
 322         avio_wl32(pb, 28); /* chunk size */
 323         wav->ds64 = avio_tell(pb);
 324         ffio_fill(pb, 0, 28);
 325     }
 326
 327     if (wav->write_peak != 2) {
 328         /* format header */
 329         fmt = ff_start_tag(pb, "fmt ");
 330         if (ff_put_wav_header(pb, s->streams[0]->codec, 0) < 0) {
 331             const AVCodecDescriptor *desc = avcodec_descriptor_get(s->streams[0]->codec->codec_id);
 332             av_log(s, AV_LOG_ERROR, "%s codec not supported in WAVE format\n",
 333                    desc ? desc->name : "unknown");
 334             return AVERROR(ENOSYS);
 335         }
 336         ff_end_tag(pb, fmt);
 337     }
 338
 339     if (s->streams[0]->codec->codec_tag != 0x01 /* hence for all other than PCM */
 340         && s->pb->seekable) {
 341         wav->fact_pos = ff_start_tag(pb, "fact");
 342         avio_wl32(pb, 0);
 343         ff_end_tag(pb, wav->fact_pos);
 344     }
 345
 346     if (wav->write_bext)
 347         bwf_write_bext_chunk(s);
 348
 349     if (wav->write_peak) {
 350         int ret;
 351         if ((ret = peak_init_writer(s)) < 0)
 352             return ret;
 353     }
 354
 355     avpriv_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codec->sample_rate);
 356     wav->maxpts = wav->last_duration = 0;
 357     wav->minpts = INT64_MAX;
 358
 359     if (wav->write_peak != 2) {
 360         /* info header */
 361         ff_riff_write_info(s);
 362
 363         /* data header */
 364         wav->data = ff_start_tag(pb, "data");
 365     }
 366
 367     avio_flush(pb);
 368
 369     return 0;
 370 }
 371
 372 static int wav_write_packet(AVFormatContext *s, AVPacket *pkt)
 373 {
 374     AVIOContext *pb  = s->pb;
 375     WAVMuxContext    *wav = s->priv_data;
 376
 377     if (wav->write_peak != 2)
 378         avio_write(pb, pkt->data, pkt->size);
 379
 380     if (wav->write_peak) {
 381         int c = 0;
 382         int i;
 383         for (i = 0; i < pkt->size; i += wav->peak_bps) {
 384             if (wav->peak_bps == 1) {
 385                 wav->peak_maxpos[c] = FFMAX(wav->peak_maxpos[c], *(int8_t*)(pkt->data + i));
 386                 wav->peak_maxneg[c] = FFMIN(wav->peak_maxneg[c], *(int8_t*)(pkt->data + i));
 387             } else {
 388                 wav->peak_maxpos[c] = FFMAX(wav->peak_maxpos[c], (int16_t)AV_RL16(pkt->data + i));
 389                 wav->peak_maxneg[c] = FFMIN(wav->peak_maxneg[c], (int16_t)AV_RL16(pkt->data + i));
 390             }
 391             if (++c == s->streams[0]->codec->channels) {
 392                 c = 0;
 393                 if (++wav->peak_block_pos == wav->peak_block_size) {
 394                     peak_write_frame(s);
 395                     wav->peak_block_pos = 0;
 396                 }
 397             }
 398         }
 399     }
 400
 401     if(pkt->pts != AV_NOPTS_VALUE) {
 402         wav->minpts        = FFMIN(wav->minpts, pkt->pts);
 403         wav->maxpts        = FFMAX(wav->maxpts, pkt->pts);
 404         wav->last_duration = pkt->duration;
 405     } else
 406         av_log(s, AV_LOG_ERROR, "wav_write_packet: NOPTS\n");
 407     return 0;
 408 }
 409
 410 static int wav_write_trailer(AVFormatContext *s)
 411 {
 412     AVIOContext *pb  = s->pb;
 413     WAVMuxContext    *wav = s->priv_data;
 414     int64_t file_size, data_size;
 415     int64_t number_of_samples = 0;
 416     int rf64 = 0;
 417
 418     avio_flush(pb);
 419
 420     if (s->pb->seekable) {
 421         if (wav->write_peak != 2) {
 422             ff_end_tag(pb, wav->data);
 423             avio_flush(pb);
 424         }
 425
 426         if (wav->write_peak && wav->peak_output) {
 427             peak_write_chunk(s);
 428             avio_flush(pb);
 429         }
 430
 431         /* update file size */
 432         file_size = avio_tell(pb);
 433         data_size = file_size - wav->data;
 434         if (wav->rf64 == RF64_ALWAYS || (wav->rf64 == RF64_AUTO && file_size - 8 > UINT32_MAX)) {
 435             rf64 = 1;
 436         } else {
 437             avio_seek(pb, 4, SEEK_SET);
 438             avio_wl32(pb, (uint32_t)(file_size - 8));
 439             avio_seek(pb, file_size, SEEK_SET);
 440
 441             avio_flush(pb);
 442         }
 443
 444         number_of_samples = av_rescale(wav->maxpts - wav->minpts + wav->last_duration,
 445                                        s->streams[0]->codec->sample_rate * (int64_t)s->streams[0]->time_base.num,
 446                                        s->streams[0]->time_base.den);
 447
 448         if(s->streams[0]->codec->codec_tag != 0x01) {
 449             /* Update num_samps in fact chunk */
 450             avio_seek(pb, wav->fact_pos, SEEK_SET);
 451             if (rf64 || (wav->rf64 == RF64_AUTO && number_of_samples > UINT32_MAX)) {
 452                 rf64 = 1;
 453                 avio_wl32(pb, -1);
 454             } else {
 455                 avio_wl32(pb, number_of_samples);
 456                 avio_seek(pb, file_size, SEEK_SET);
 457                 avio_flush(pb);
 458             }
 459         }
 460
 461         if (rf64) {
 462             /* overwrite RIFF with RF64 */
 463             avio_seek(pb, 0, SEEK_SET);
 464             ffio_wfourcc(pb, "RF64");
 465             avio_wl32(pb, -1);
 466
 467             /* write ds64 chunk (overwrite JUNK if rf64 == RF64_AUTO) */
 468             avio_seek(pb, wav->ds64 - 8, SEEK_SET);
 469             ffio_wfourcc(pb, "ds64");
 470             avio_wl32(pb, 28);                  /* ds64 chunk size */
 471             avio_wl64(pb, file_size - 8);       /* RF64 chunk size */
 472             avio_wl64(pb, data_size);           /* data chunk size */
 473             avio_wl64(pb, number_of_samples);   /* fact chunk number of samples */
 474             avio_wl32(pb, 0);                   /* number of table entries for non-'data' chunks */
 475
 476             /* write -1 in data chunk size */
 477             avio_seek(pb, wav->data - 4, SEEK_SET);
 478             avio_wl32(pb, -1);
 479
 480             avio_seek(pb, file_size, SEEK_SET);
 481             avio_flush(pb);
 482         }
 483     }
 484
 485     if (wav->write_peak)
 486         peak_free_buffers(s);
 487
 488     return 0;
 489 }
 490
 491 #define OFFSET(x) offsetof(WAVMuxContext, x)
 492 #define ENC AV_OPT_FLAG_ENCODING_PARAM
 493 static const AVOption options[] = {
 494     { "write_bext", "Write BEXT chunk.", OFFSET(write_bext), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, ENC },
 495     { "write_peak", "Write Peak Envelope chunk.",            OFFSET(write_peak), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 2, ENC, "peak" },
 496     { "off",        "Do not write peak chunk.",              0,                  AV_OPT_TYPE_CONST, { .i64 = PEAK_OFF  }, 0, 0, ENC, "peak" },
 497     { "on",         "Append peak chunk after wav data.",     0,                  AV_OPT_TYPE_CONST, { .i64 = PEAK_ON   }, 0, 0, ENC, "peak" },
 498     { "only",       "Write only peak chunk, omit wav data.", 0,                  AV_OPT_TYPE_CONST, { .i64 = PEAK_ONLY }, 0, 0, ENC, "peak" },
 499     { "rf64",       "Use RF64 header rather than RIFF for large files.",    OFFSET(rf64), AV_OPT_TYPE_INT,   { .i64 = RF64_NEVER  },-1, 1, ENC, "rf64" },
 500     { "auto",       "Write RF64 header if file grows large enough.",        0,            AV_OPT_TYPE_CONST, { .i64 = RF64_AUTO   }, 0, 0, ENC, "rf64" },
 501     { "always",     "Always write RF64 header regardless of file size.",    0,            AV_OPT_TYPE_CONST, { .i64 = RF64_ALWAYS }, 0, 0, ENC, "rf64" },
 502     { "never",      "Never write RF64 header regardless of file size.",     0,            AV_OPT_TYPE_CONST, { .i64 = RF64_NEVER  }, 0, 0, ENC, "rf64" },
 503     { "peak_block_size", "Number of audio samples used to generate each peak frame.",   OFFSET(peak_block_size), AV_OPT_TYPE_INT, { .i64 = 256 }, 0, 65536, ENC },
 504     { "peak_format",     "The format of the peak envelope data (1: uint8, 2: uint16).", OFFSET(peak_format), AV_OPT_TYPE_INT,     { .i64 = PEAK_FORMAT_UINT16 }, PEAK_FORMAT_UINT8, PEAK_FORMAT_UINT16, ENC },
 505     { "peak_ppv",        "Number of peak points per peak value (1 or 2).",              OFFSET(peak_ppv), AV_OPT_TYPE_INT, { .i64 = 2 }, 1, 2, ENC },
 506     { NULL },
 507 };
 508
 509 static const AVClass wav_muxer_class = {
 510     .class_name = "WAV muxer",
 511     .item_name  = av_default_item_name,
 512     .option     = options,
 513     .version    = LIBAVUTIL_VERSION_INT,
 514 };
 515
 516 AVOutputFormat ff_wav_muxer = {
 517     .name              = "wav",
 518     .long_name         = NULL_IF_CONFIG_SMALL("WAV / WAVE (Waveform Audio)"),
 519     .mime_type         = "audio/x-wav",
 520     .extensions        = "wav",
 521     .priv_data_size    = sizeof(WAVMuxContext),
 522     .audio_codec       = AV_CODEC_ID_PCM_S16LE,
 523     .video_codec       = AV_CODEC_ID_NONE,
 524     .write_header      = wav_write_header,
 525     .write_packet      = wav_write_packet,
 526     .write_trailer     = wav_write_trailer,
 527     .flags             = AVFMT_TS_NONSTRICT,
 528     .codec_tag         = (const AVCodecTag* const []){ ff_codec_wav_tags, 0 },
 529     .priv_class        = &wav_muxer_class,
 530 };
 531 #endif /* CONFIG_WAV_MUXER */
 532
 533 #if CONFIG_W64_MUXER
 534 #include "w64.h"
 535
 536 static void start_guid(AVIOContext *pb, const uint8_t *guid, int64_t *pos)
 537 {
 538     *pos = avio_tell(pb);
 539
 540     avio_write(pb, guid, 16);
 541     avio_wl64(pb, INT64_MAX);
 542 }
 543
 544 static void end_guid(AVIOContext *pb, int64_t start)
 545 {
 546     int64_t end, pos = avio_tell(pb);
 547
 548     end = FFALIGN(pos, 8);
 549     ffio_fill(pb, 0, end - pos);
 550     avio_seek(pb, start + 16, SEEK_SET);
 551     avio_wl64(pb, end - start);
 552     avio_seek(pb, end, SEEK_SET);
 553 }
 554
 555 static int w64_write_header(AVFormatContext *s)
 556 {
 557     WAVMuxContext *wav = s->priv_data;
 558     AVIOContext *pb = s->pb;
 559     int64_t start;
 560     int ret;
 561
 562     avio_write(pb, ff_w64_guid_riff, sizeof(ff_w64_guid_riff));
 563     avio_wl64(pb, -1);
 564     avio_write(pb, ff_w64_guid_wave, sizeof(ff_w64_guid_wave));
 565     start_guid(pb, ff_w64_guid_fmt, &start);
 566     if ((ret = ff_put_wav_header(pb, s->streams[0]->codec, 0)) < 0) {
 567         av_log(s, AV_LOG_ERROR, "%s codec not supported\n",
 568                s->streams[0]->codec->codec ? s->streams[0]->codec->codec->name : "NONE");
 569         return ret;
 570     }
 571     end_guid(pb, start);
 572
 573     if (s->streams[0]->codec->codec_tag != 0x01 /* hence for all other than PCM */
 574         && s->pb->seekable) {
 575         start_guid(pb, ff_w64_guid_fact, &wav->fact_pos);
 576         avio_wl64(pb, 0);
 577         end_guid(pb, wav->fact_pos);
 578     }
 579
 580     start_guid(pb, ff_w64_guid_data, &wav->data);
 581
 582     return 0;
 583 }
 584
 585 static int w64_write_trailer(AVFormatContext *s)
 586 {
 587     AVIOContext    *pb = s->pb;
 588     WAVMuxContext *wav = s->priv_data;
 589     int64_t file_size;
 590
 591     if (pb->seekable) {
 592         end_guid(pb, wav->data);
 593
 594         file_size = avio_tell(pb);
 595         avio_seek(pb, 16, SEEK_SET);
 596         avio_wl64(pb, file_size);
 597
 598         if (s->streams[0]->codec->codec_tag != 0x01) {
 599             int64_t number_of_samples;
 600
 601             number_of_samples = av_rescale(wav->maxpts - wav->minpts + wav->last_duration,
 602                                            s->streams[0]->codec->sample_rate * (int64_t)s->streams[0]->time_base.num,
 603                                            s->streams[0]->time_base.den);
 604             avio_seek(pb, wav->fact_pos + 24, SEEK_SET);
 605             avio_wl64(pb, number_of_samples);
 606         }
 607
 608         avio_seek(pb, file_size, SEEK_SET);
 609         avio_flush(pb);
 610     }
 611
 612     return 0;
 613 }
 614
 615 AVOutputFormat ff_w64_muxer = {
 616     .name              = "w64",
 617     .long_name         = NULL_IF_CONFIG_SMALL("Sony Wave64"),
 618     .extensions        = "w64",
 619     .priv_data_size    = sizeof(WAVMuxContext),
 620     .audio_codec       = AV_CODEC_ID_PCM_S16LE,
 621     .video_codec       = AV_CODEC_ID_NONE,
 622     .write_header      = w64_write_header,
 623     .write_packet      = wav_write_packet,
 624     .write_trailer     = w64_write_trailer,
 625     .flags             = AVFMT_TS_NONSTRICT,
 626     .codec_tag         = (const AVCodecTag* const []){ ff_codec_wav_tags, 0 },
 627 };
 628 #endif /* CONFIG_W64_MUXER */