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     uint8_t *peak_output;
  78     int last_duration;
  79     int write_bext;
  80     int write_peak;
  81     int rf64;
  82     int peak_block_size;
  83     int peak_format;
  84     int peak_block_pos;
  85     int peak_ppv;
  86     int peak_bps;
  87 } WAVMuxContext;
  88
  89 #if CONFIG_WAV_MUXER
  90 static inline void bwf_write_bext_string(AVFormatContext *s, const char *key, int maxlen)
  91 {
  92     AVDictionaryEntry *tag;
  93     size_t len = 0;
  94
  95     if (tag = av_dict_get(s->metadata, key, NULL, 0)) {
  96         len = strlen(tag->value);
  97         len = FFMIN(len, maxlen);
  98         avio_write(s->pb, tag->value, len);
  99     }
 100
 101     ffio_fill(s->pb, 0, maxlen - len);
 102 }
 103
 104 static void bwf_write_bext_chunk(AVFormatContext *s)
 105 {
 106     AVDictionaryEntry *tmp_tag;
 107     uint64_t time_reference = 0;
 108     int64_t bext = ff_start_tag(s->pb, "bext");
 109
 110     bwf_write_bext_string(s, "description", 256);
 111     bwf_write_bext_string(s, "originator", 32);
 112     bwf_write_bext_string(s, "originator_reference", 32);
 113     bwf_write_bext_string(s, "origination_date", 10);
 114     bwf_write_bext_string(s, "origination_time", 8);
 115
 116     if (tmp_tag = av_dict_get(s->metadata, "time_reference", NULL, 0))
 117         time_reference = strtoll(tmp_tag->value, NULL, 10);
 118     avio_wl64(s->pb, time_reference);
 119     avio_wl16(s->pb, 1);  // set version to 1
 120
 121     if ((tmp_tag = av_dict_get(s->metadata, "umid", NULL, 0)) && strlen(tmp_tag->value) > 2) {
 122         unsigned char umidpart_str[17] = {0};
 123         int64_t i;
 124         uint64_t umidpart;
 125         size_t len = strlen(tmp_tag->value+2);
 126
 127         for (i = 0; i < len/16; i++) {
 128             memcpy(umidpart_str, tmp_tag->value + 2 + (i*16), 16);
 129             umidpart = strtoll(umidpart_str, NULL, 16);
 130             avio_wb64(s->pb, umidpart);
 131         }
 132         ffio_fill(s->pb, 0, 64 - i*8);
 133     } else
 134         ffio_fill(s->pb, 0, 64); // zero UMID
 135
 136     ffio_fill(s->pb, 0, 190); // Reserved
 137
 138     if (tmp_tag = av_dict_get(s->metadata, "coding_history", NULL, 0))
 139         avio_put_str(s->pb, tmp_tag->value);
 140
 141     ff_end_tag(s->pb, bext);
 142 }
 143
 144 static av_cold void wav_deinit(AVFormatContext *s)
 145 {
 146     WAVMuxContext *wav = s->priv_data;
 147
 148     av_freep(&wav->peak_maxpos);
 149     av_freep(&wav->peak_maxneg);
 150     av_freep(&wav->peak_output);
 151 }
 152
 153 static av_cold int peak_init_writer(AVFormatContext *s)
 154 {
 155     WAVMuxContext *wav = s->priv_data;
 156     AVCodecParameters *par = s->streams[0]->codecpar;
 157
 158     if (par->codec_id != AV_CODEC_ID_PCM_S8 &&
 159         par->codec_id != AV_CODEC_ID_PCM_S16LE &&
 160         par->codec_id != AV_CODEC_ID_PCM_U8 &&
 161         par->codec_id != AV_CODEC_ID_PCM_U16LE) {
 162         AVCodec *codec = avcodec_find_decoder(s->streams[0]->codecpar->codec_id);
 163         av_log(s, AV_LOG_ERROR, "%s codec not supported for Peak Chunk\n",
 164                codec ? codec->name : "NONE");
 165         return -1;
 166     }
 167
 168     wav->peak_bps = av_get_bits_per_sample(par->codec_id) / 8;
 169
 170     if (wav->peak_bps == 1 && wav->peak_format == PEAK_FORMAT_UINT16) {
 171         av_log(s, AV_LOG_ERROR,
 172                "Writing 16 bit peak for 8 bit audio does not make sense\n");
 173         return AVERROR(EINVAL);
 174     }
 175
 176     wav->peak_maxpos = av_mallocz_array(par->channels, sizeof(*wav->peak_maxpos));
 177     wav->peak_maxneg = av_mallocz_array(par->channels, sizeof(*wav->peak_maxneg));
 178     wav->peak_output = av_malloc(PEAK_BUFFER_SIZE);
 179     if (!wav->peak_maxpos || !wav->peak_maxneg || !wav->peak_output)
 180         goto nomem;
 181
 182     wav->peak_outbuf_size = PEAK_BUFFER_SIZE;
 183
 184     return 0;
 185
 186 nomem:
 187     av_log(s, AV_LOG_ERROR, "Out of memory\n");
 188     return AVERROR(ENOMEM);
 189 }
 190
 191 static void peak_write_frame(AVFormatContext *s)
 192 {
 193     WAVMuxContext *wav = s->priv_data;
 194     AVCodecParameters *par = s->streams[0]->codecpar;
 195     int c;
 196
 197     if (!wav->peak_output)
 198         return;
 199
 200     for (c = 0; c < par->channels; c++) {
 201         wav->peak_maxneg[c] = -wav->peak_maxneg[c];
 202
 203         if (wav->peak_bps == 2 && wav->peak_format == PEAK_FORMAT_UINT8) {
 204             wav->peak_maxpos[c] = wav->peak_maxpos[c] / 256;
 205             wav->peak_maxneg[c] = wav->peak_maxneg[c] / 256;
 206         }
 207
 208         if (wav->peak_ppv == 1)
 209             wav->peak_maxpos[c] =
 210                 FFMAX(wav->peak_maxpos[c], wav->peak_maxneg[c]);
 211
 212         if (wav->peak_outbuf_size - wav->peak_outbuf_bytes <
 213             wav->peak_format * wav->peak_ppv) {
 214             wav->peak_outbuf_size += PEAK_BUFFER_SIZE;
 215             wav->peak_output = av_realloc(wav->peak_output,
 216                                           wav->peak_outbuf_size);
 217             if (!wav->peak_output) {
 218                 av_log(s, AV_LOG_ERROR, "No memory for peak data\n");
 219                 return;
 220             }
 221         }
 222
 223         if (wav->peak_format == PEAK_FORMAT_UINT8) {
 224             wav->peak_output[wav->peak_outbuf_bytes++] =
 225                 wav->peak_maxpos[c];
 226             if (wav->peak_ppv == 2) {
 227                 wav->peak_output[wav->peak_outbuf_bytes++] =
 228                     wav->peak_maxneg[c];
 229             }
 230         } else {
 231             AV_WL16(wav->peak_output + wav->peak_outbuf_bytes,
 232                     wav->peak_maxpos[c]);
 233             wav->peak_outbuf_bytes += 2;
 234             if (wav->peak_ppv == 2) {
 235                 AV_WL16(wav->peak_output + wav->peak_outbuf_bytes,
 236                         wav->peak_maxneg[c]);
 237                 wav->peak_outbuf_bytes += 2;
 238             }
 239         }
 240         wav->peak_maxpos[c] = 0;
 241         wav->peak_maxneg[c] = 0;
 242     }
 243     wav->peak_num_frames++;
 244 }
 245
 246 static int peak_write_chunk(AVFormatContext *s)
 247 {
 248     WAVMuxContext *wav = s->priv_data;
 249     AVIOContext *pb = s->pb;
 250     AVCodecParameters *par = s->streams[0]->codecpar;
 251     int64_t peak = ff_start_tag(s->pb, "levl");
 252     int64_t now0;
 253     time_t now_secs;
 254     char timestamp[28];
 255
 256     /* Peak frame of incomplete block at end */
 257     if (wav->peak_block_pos)
 258         peak_write_frame(s);
 259
 260     memset(timestamp, 0, sizeof(timestamp));
 261     if (!(s->flags & AVFMT_FLAG_BITEXACT)) {
 262         struct tm tmpbuf;
 263         av_log(s, AV_LOG_INFO, "Writing local time and date to Peak Envelope Chunk\n");
 264         now0 = av_gettime();
 265         now_secs = now0 / 1000000;
 266         if (strftime(timestamp, sizeof(timestamp), "%Y:%m:%d:%H:%M:%S:", localtime_r(&now_secs, &tmpbuf))) {
 267             av_strlcatf(timestamp, sizeof(timestamp), "%03d", (int)((now0 / 1000) % 1000));
 268         } else {
 269             av_log(s, AV_LOG_ERROR, "Failed to write timestamp\n");
 270             return -1;
 271         }
 272     }
 273
 274     avio_wl32(pb, 1);                           /* version */
 275     avio_wl32(pb, wav->peak_format);            /* 8 or 16 bit */
 276     avio_wl32(pb, wav->peak_ppv);               /* positive and negative */
 277     avio_wl32(pb, wav->peak_block_size);        /* frames per value */
 278     avio_wl32(pb, par->channels);               /* number of channels */
 279     avio_wl32(pb, wav->peak_num_frames);        /* number of peak frames */
 280     avio_wl32(pb, -1);                          /* audio sample frame position (not implemented) */
 281     avio_wl32(pb, 128);                         /* equal to size of header */
 282     avio_write(pb, timestamp, 28);              /* ASCII time stamp */
 283     ffio_fill(pb, 0, 60);
 284
 285     avio_write(pb, wav->peak_output, wav->peak_outbuf_bytes);
 286
 287     ff_end_tag(pb, peak);
 288
 289     if (!wav->data)
 290         wav->data = peak;
 291
 292     return 0;
 293 }
 294
 295 static int wav_write_header(AVFormatContext *s)
 296 {
 297     WAVMuxContext *wav = s->priv_data;
 298     AVIOContext *pb = s->pb;
 299     int64_t fmt;
 300
 301     if (s->nb_streams != 1) {
 302         av_log(s, AV_LOG_ERROR, "WAVE files have exactly one stream\n");
 303         return AVERROR(EINVAL);
 304     }
 305
 306     if (wav->rf64 == RF64_ALWAYS) {
 307         ffio_wfourcc(pb, "RF64");
 308         avio_wl32(pb, -1); /* RF64 chunk size: use size in ds64 */
 309     } else {
 310         ffio_wfourcc(pb, "RIFF");
 311         avio_wl32(pb, -1); /* file length */
 312     }
 313
 314     ffio_wfourcc(pb, "WAVE");
 315
 316     if (wav->rf64 != RF64_NEVER) {
 317         /* write empty ds64 chunk or JUNK chunk to reserve space for ds64 */
 318         ffio_wfourcc(pb, wav->rf64 == RF64_ALWAYS ? "ds64" : "JUNK");
 319         avio_wl32(pb, 28); /* chunk size */
 320         wav->ds64 = avio_tell(pb);
 321         ffio_fill(pb, 0, 28);
 322     }
 323
 324     if (wav->write_peak != PEAK_ONLY) {
 325         /* format header */
 326         fmt = ff_start_tag(pb, "fmt ");
 327         if (ff_put_wav_header(s, pb, s->streams[0]->codecpar, 0) < 0) {
 328             const AVCodecDescriptor *desc = avcodec_descriptor_get(s->streams[0]->codecpar->codec_id);
 329             av_log(s, AV_LOG_ERROR, "%s codec not supported in WAVE format\n",
 330                    desc ? desc->name : "unknown");
 331             return AVERROR(ENOSYS);
 332         }
 333         ff_end_tag(pb, fmt);
 334     }
 335
 336     if (s->streams[0]->codecpar->codec_tag != 0x01 /* hence for all other than PCM */
 337         && (s->pb->seekable & AVIO_SEEKABLE_NORMAL)) {
 338         wav->fact_pos = ff_start_tag(pb, "fact");
 339         avio_wl32(pb, 0);
 340         ff_end_tag(pb, wav->fact_pos);
 341     }
 342
 343     if (wav->write_bext)
 344         bwf_write_bext_chunk(s);
 345
 346     if (wav->write_peak) {
 347         int ret;
 348         if ((ret = peak_init_writer(s)) < 0)
 349             return ret;
 350     }
 351
 352     avpriv_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codecpar->sample_rate);
 353     wav->maxpts = wav->last_duration = 0;
 354     wav->minpts = INT64_MAX;
 355
 356     if (wav->write_peak != PEAK_ONLY) {
 357         /* info header */
 358         ff_riff_write_info(s);
 359
 360         /* data header */
 361         wav->data = ff_start_tag(pb, "data");
 362     }
 363
 364     return 0;
 365 }
 366
 367 static int wav_write_packet(AVFormatContext *s, AVPacket *pkt)
 368 {
 369     AVIOContext *pb  = s->pb;
 370     WAVMuxContext    *wav = s->priv_data;
 371
 372     if (wav->write_peak != PEAK_ONLY)
 373         avio_write(pb, pkt->data, pkt->size);
 374
 375     if (wav->write_peak) {
 376         int c = 0;
 377         int i;
 378         for (i = 0; i < pkt->size; i += wav->peak_bps) {
 379             if (wav->peak_bps == 1) {
 380                 wav->peak_maxpos[c] = FFMAX(wav->peak_maxpos[c], *(int8_t*)(pkt->data + i));
 381                 wav->peak_maxneg[c] = FFMIN(wav->peak_maxneg[c], *(int8_t*)(pkt->data + i));
 382             } else {
 383                 wav->peak_maxpos[c] = FFMAX(wav->peak_maxpos[c], (int16_t)AV_RL16(pkt->data + i));
 384                 wav->peak_maxneg[c] = FFMIN(wav->peak_maxneg[c], (int16_t)AV_RL16(pkt->data + i));
 385             }
 386             if (++c == s->streams[0]->codecpar->channels) {
 387                 c = 0;
 388                 if (++wav->peak_block_pos == wav->peak_block_size) {
 389                     peak_write_frame(s);
 390                     wav->peak_block_pos = 0;
 391                 }
 392             }
 393         }
 394     }
 395
 396     if(pkt->pts != AV_NOPTS_VALUE) {
 397         wav->minpts        = FFMIN(wav->minpts, pkt->pts);
 398         wav->maxpts        = FFMAX(wav->maxpts, pkt->pts);
 399         wav->last_duration = pkt->duration;
 400     } else
 401         av_log(s, AV_LOG_ERROR, "wav_write_packet: NOPTS\n");
 402     return 0;
 403 }
 404
 405 static int wav_write_trailer(AVFormatContext *s)
 406 {
 407     AVIOContext *pb  = s->pb;
 408     WAVMuxContext    *wav = s->priv_data;
 409     int64_t file_size, data_size;
 410     int64_t number_of_samples = 0;
 411     int rf64 = 0;
 412     int ret = 0;
 413
 414     if (s->pb->seekable & AVIO_SEEKABLE_NORMAL) {
 415         if (wav->write_peak != PEAK_ONLY && avio_tell(pb) - wav->data < UINT32_MAX) {
 416             ff_end_tag(pb, wav->data);
 417         }
 418
 419         if (wav->write_peak && wav->peak_output) {
 420             ret = peak_write_chunk(s);
 421         }
 422
 423         /* update file size */
 424         file_size = avio_tell(pb);
 425         data_size = file_size - wav->data;
 426         if (wav->rf64 == RF64_ALWAYS || (wav->rf64 == RF64_AUTO && file_size - 8 > UINT32_MAX)) {
 427             rf64 = 1;
 428         } else if (file_size - 8 <= UINT32_MAX) {
 429             avio_seek(pb, 4, SEEK_SET);
 430             avio_wl32(pb, (uint32_t)(file_size - 8));
 431             avio_seek(pb, file_size, SEEK_SET);
 432         } else {
 433             av_log(s, AV_LOG_ERROR,
 434                    "Filesize %"PRId64" invalid for wav, output file will be broken\n",
 435                    file_size);
 436         }
 437
 438         number_of_samples = av_rescale(wav->maxpts - wav->minpts + wav->last_duration,
 439                                        s->streams[0]->codecpar->sample_rate * (int64_t)s->streams[0]->time_base.num,
 440                                        s->streams[0]->time_base.den);
 441
 442         if(s->streams[0]->codecpar->codec_tag != 0x01) {
 443             /* Update num_samps in fact chunk */
 444             avio_seek(pb, wav->fact_pos, SEEK_SET);
 445             if (rf64 || (wav->rf64 == RF64_AUTO && number_of_samples > UINT32_MAX)) {
 446                 rf64 = 1;
 447                 avio_wl32(pb, -1);
 448             } else {
 449                 avio_wl32(pb, number_of_samples);
 450                 avio_seek(pb, file_size, SEEK_SET);
 451             }
 452         }
 453
 454         if (rf64) {
 455             /* overwrite RIFF with RF64 */
 456             avio_seek(pb, 0, SEEK_SET);
 457             ffio_wfourcc(pb, "RF64");
 458             avio_wl32(pb, -1);
 459
 460             /* write ds64 chunk (overwrite JUNK if rf64 == RF64_AUTO) */
 461             avio_seek(pb, wav->ds64 - 8, SEEK_SET);
 462             ffio_wfourcc(pb, "ds64");
 463             avio_wl32(pb, 28);                  /* ds64 chunk size */
 464             avio_wl64(pb, file_size - 8);       /* RF64 chunk size */
 465             avio_wl64(pb, data_size);           /* data chunk size */
 466             avio_wl64(pb, number_of_samples);   /* fact chunk number of samples */
 467             avio_wl32(pb, 0);                   /* number of table entries for non-'data' chunks */
 468
 469             /* write -1 in data chunk size */
 470             avio_seek(pb, wav->data - 4, SEEK_SET);
 471             avio_wl32(pb, -1);
 472
 473             avio_seek(pb, file_size, SEEK_SET);
 474         }
 475     }
 476
 477     return ret;
 478 }
 479
 480 #define OFFSET(x) offsetof(WAVMuxContext, x)
 481 #define ENC AV_OPT_FLAG_ENCODING_PARAM
 482 static const AVOption options[] = {
 483     { "write_bext", "Write BEXT chunk.", OFFSET(write_bext), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, ENC },
 484     { "write_peak", "Write Peak Envelope chunk.",            OFFSET(write_peak), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 2, ENC, "peak" },
 485     { "off",        "Do not write peak chunk.",              0,                  AV_OPT_TYPE_CONST, { .i64 = PEAK_OFF  }, 0, 0, ENC, "peak" },
 486     { "on",         "Append peak chunk after wav data.",     0,                  AV_OPT_TYPE_CONST, { .i64 = PEAK_ON   }, 0, 0, ENC, "peak" },
 487     { "only",       "Write only peak chunk, omit wav data.", 0,                  AV_OPT_TYPE_CONST, { .i64 = PEAK_ONLY }, 0, 0, ENC, "peak" },
 488     { "rf64",       "Use RF64 header rather than RIFF for large files.",    OFFSET(rf64), AV_OPT_TYPE_INT,   { .i64 = RF64_NEVER  },-1, 1, ENC, "rf64" },
 489     { "auto",       "Write RF64 header if file grows large enough.",        0,            AV_OPT_TYPE_CONST, { .i64 = RF64_AUTO   }, 0, 0, ENC, "rf64" },
 490     { "always",     "Always write RF64 header regardless of file size.",    0,            AV_OPT_TYPE_CONST, { .i64 = RF64_ALWAYS }, 0, 0, ENC, "rf64" },
 491     { "never",      "Never write RF64 header regardless of file size.",     0,            AV_OPT_TYPE_CONST, { .i64 = RF64_NEVER  }, 0, 0, ENC, "rf64" },
 492     { "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 },
 493     { "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 },
 494     { "peak_ppv",        "Number of peak points per peak value (1 or 2).",              OFFSET(peak_ppv), AV_OPT_TYPE_INT, { .i64 = 2 }, 1, 2, ENC },
 495     { NULL },
 496 };
 497
 498 static const AVClass wav_muxer_class = {
 499     .class_name = "WAV muxer",
 500     .item_name  = av_default_item_name,
 501     .option     = options,
 502     .version    = LIBAVUTIL_VERSION_INT,
 503 };
 504
 505 AVOutputFormat ff_wav_muxer = {
 506     .name              = "wav",
 507     .long_name         = NULL_IF_CONFIG_SMALL("WAV / WAVE (Waveform Audio)"),
 508     .mime_type         = "audio/x-wav",
 509     .extensions        = "wav",
 510     .priv_data_size    = sizeof(WAVMuxContext),
 511     .audio_codec       = AV_CODEC_ID_PCM_S16LE,
 512     .video_codec       = AV_CODEC_ID_NONE,
 513     .write_header      = wav_write_header,
 514     .write_packet      = wav_write_packet,
 515     .write_trailer     = wav_write_trailer,
 516     .deinit            = wav_deinit,
 517     .flags             = AVFMT_TS_NONSTRICT,
 518     .codec_tag         = (const AVCodecTag* const []){ ff_codec_wav_tags, 0 },
 519     .priv_class        = &wav_muxer_class,
 520 };
 521 #endif /* CONFIG_WAV_MUXER */
 522
 523 #if CONFIG_W64_MUXER
 524 #include "w64.h"
 525
 526 static void start_guid(AVIOContext *pb, const uint8_t *guid, int64_t *pos)
 527 {
 528     *pos = avio_tell(pb);
 529
 530     avio_write(pb, guid, 16);
 531     avio_wl64(pb, INT64_MAX);
 532 }
 533
 534 static void end_guid(AVIOContext *pb, int64_t start)
 535 {
 536     int64_t end, pos = avio_tell(pb);
 537
 538     end = FFALIGN(pos, 8);
 539     ffio_fill(pb, 0, end - pos);
 540     avio_seek(pb, start + 16, SEEK_SET);
 541     avio_wl64(pb, end - start);
 542     avio_seek(pb, end, SEEK_SET);
 543 }
 544
 545 static int w64_write_header(AVFormatContext *s)
 546 {
 547     WAVMuxContext *wav = s->priv_data;
 548     AVIOContext *pb = s->pb;
 549     int64_t start;
 550     int ret;
 551
 552     avio_write(pb, ff_w64_guid_riff, sizeof(ff_w64_guid_riff));
 553     avio_wl64(pb, -1);
 554     avio_write(pb, ff_w64_guid_wave, sizeof(ff_w64_guid_wave));
 555     start_guid(pb, ff_w64_guid_fmt, &start);
 556     if ((ret = ff_put_wav_header(s, pb, s->streams[0]->codecpar, 0)) < 0) {
 557         AVCodec *codec = avcodec_find_decoder(s->streams[0]->codecpar->codec_id);
 558         av_log(s, AV_LOG_ERROR, "%s codec not supported\n",
 559                codec ? codec->name : "NONE");
 560         return ret;
 561     }
 562     end_guid(pb, start);
 563
 564     if (s->streams[0]->codecpar->codec_tag != 0x01 /* hence for all other than PCM */
 565         && (s->pb->seekable & AVIO_SEEKABLE_NORMAL)) {
 566         start_guid(pb, ff_w64_guid_fact, &wav->fact_pos);
 567         avio_wl64(pb, 0);
 568         end_guid(pb, wav->fact_pos);
 569     }
 570
 571     start_guid(pb, ff_w64_guid_data, &wav->data);
 572
 573     return 0;
 574 }
 575
 576 static int w64_write_trailer(AVFormatContext *s)
 577 {
 578     AVIOContext    *pb = s->pb;
 579     WAVMuxContext *wav = s->priv_data;
 580     int64_t file_size;
 581
 582     if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
 583         end_guid(pb, wav->data);
 584
 585         file_size = avio_tell(pb);
 586         avio_seek(pb, 16, SEEK_SET);
 587         avio_wl64(pb, file_size);
 588
 589         if (s->streams[0]->codecpar->codec_tag != 0x01) {
 590             int64_t number_of_samples;
 591
 592             number_of_samples = av_rescale(wav->maxpts - wav->minpts + wav->last_duration,
 593                                            s->streams[0]->codecpar->sample_rate * (int64_t)s->streams[0]->time_base.num,
 594                                            s->streams[0]->time_base.den);
 595             avio_seek(pb, wav->fact_pos + 24, SEEK_SET);
 596             avio_wl64(pb, number_of_samples);
 597         }
 598
 599         avio_seek(pb, file_size, SEEK_SET);
 600     }
 601
 602     return 0;
 603 }
 604
 605 AVOutputFormat ff_w64_muxer = {
 606     .name              = "w64",
 607     .long_name         = NULL_IF_CONFIG_SMALL("Sony Wave64"),
 608     .extensions        = "w64",
 609     .priv_data_size    = sizeof(WAVMuxContext),
 610     .audio_codec       = AV_CODEC_ID_PCM_S16LE,
 611     .video_codec       = AV_CODEC_ID_NONE,
 612     .write_header      = w64_write_header,
 613     .write_packet      = wav_write_packet,
 614     .write_trailer     = w64_write_trailer,
 615     .flags             = AVFMT_TS_NONSTRICT,
 616     .codec_tag         = (const AVCodecTag* const []){ ff_codec_wav_tags, 0 },
 617 };
 618 #endif /* CONFIG_W64_MUXER */