avformat/mxfdec: compute both essence_offset and essence_length in mxf_compute_essenc...
[ffmpeg.git] / 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 peak_free_buffers(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     peak_free_buffers(s);
189     return AVERROR(ENOMEM);
190 }
191
192 static void peak_write_frame(AVFormatContext *s)
193 {
194     WAVMuxContext *wav = s->priv_data;
195     AVCodecParameters *par = s->streams[0]->codecpar;
196     int c;
197
198     if (!wav->peak_output)
199         return;
200
201     for (c = 0; c < par->channels; c++) {
202         wav->peak_maxneg[c] = -wav->peak_maxneg[c];
203
204         if (wav->peak_bps == 2 && wav->peak_format == PEAK_FORMAT_UINT8) {
205             wav->peak_maxpos[c] = wav->peak_maxpos[c] / 256;
206             wav->peak_maxneg[c] = wav->peak_maxneg[c] / 256;
207         }
208
209         if (wav->peak_ppv == 1)
210             wav->peak_maxpos[c] =
211                 FFMAX(wav->peak_maxpos[c], wav->peak_maxneg[c]);
212
213         if (wav->peak_outbuf_size - wav->peak_outbuf_bytes <
214             wav->peak_format * wav->peak_ppv) {
215             wav->peak_outbuf_size += PEAK_BUFFER_SIZE;
216             wav->peak_output = av_realloc(wav->peak_output,
217                                           wav->peak_outbuf_size);
218             if (!wav->peak_output) {
219                 av_log(s, AV_LOG_ERROR, "No memory for peak data\n");
220                 return;
221             }
222         }
223
224         if (wav->peak_format == PEAK_FORMAT_UINT8) {
225             wav->peak_output[wav->peak_outbuf_bytes++] =
226                 wav->peak_maxpos[c];
227             if (wav->peak_ppv == 2) {
228                 wav->peak_output[wav->peak_outbuf_bytes++] =
229                     wav->peak_maxneg[c];
230             }
231         } else {
232             AV_WL16(wav->peak_output + wav->peak_outbuf_bytes,
233                     wav->peak_maxpos[c]);
234             wav->peak_outbuf_bytes += 2;
235             if (wav->peak_ppv == 2) {
236                 AV_WL16(wav->peak_output + wav->peak_outbuf_bytes,
237                         wav->peak_maxneg[c]);
238                 wav->peak_outbuf_bytes += 2;
239             }
240         }
241         wav->peak_maxpos[c] = 0;
242         wav->peak_maxneg[c] = 0;
243     }
244     wav->peak_num_frames++;
245 }
246
247 static int peak_write_chunk(AVFormatContext *s)
248 {
249     WAVMuxContext *wav = s->priv_data;
250     AVIOContext *pb = s->pb;
251     AVCodecParameters *par = s->streams[0]->codecpar;
252     int64_t peak = ff_start_tag(s->pb, "levl");
253     int64_t now0;
254     time_t now_secs;
255     char timestamp[28];
256
257     /* Peak frame of incomplete block at end */
258     if (wav->peak_block_pos)
259         peak_write_frame(s);
260
261     memset(timestamp, 0, sizeof(timestamp));
262     if (!(s->flags & AVFMT_FLAG_BITEXACT)) {
263         struct tm tmpbuf;
264         av_log(s, AV_LOG_INFO, "Writing local time and date to Peak Envelope Chunk\n");
265         now0 = av_gettime();
266         now_secs = now0 / 1000000;
267         if (strftime(timestamp, sizeof(timestamp), "%Y:%m:%d:%H:%M:%S:", localtime_r(&now_secs, &tmpbuf))) {
268             av_strlcatf(timestamp, sizeof(timestamp), "%03d", (int)((now0 / 1000) % 1000));
269         } else {
270             av_log(s, AV_LOG_ERROR, "Failed to write timestamp\n");
271             return -1;
272         }
273     }
274
275     avio_wl32(pb, 1);                           /* version */
276     avio_wl32(pb, wav->peak_format);            /* 8 or 16 bit */
277     avio_wl32(pb, wav->peak_ppv);               /* positive and negative */
278     avio_wl32(pb, wav->peak_block_size);        /* frames per value */
279     avio_wl32(pb, par->channels);               /* number of channels */
280     avio_wl32(pb, wav->peak_num_frames);        /* number of peak frames */
281     avio_wl32(pb, -1);                          /* audio sample frame position (not implemented) */
282     avio_wl32(pb, 128);                         /* equal to size of header */
283     avio_write(pb, timestamp, 28);              /* ASCII time stamp */
284     ffio_fill(pb, 0, 60);
285
286     avio_write(pb, wav->peak_output, wav->peak_outbuf_bytes);
287
288     ff_end_tag(pb, peak);
289
290     if (!wav->data)
291         wav->data = peak;
292
293     return 0;
294 }
295
296 static int wav_write_header(AVFormatContext *s)
297 {
298     WAVMuxContext *wav = s->priv_data;
299     AVIOContext *pb = s->pb;
300     int64_t fmt;
301
302     if (s->nb_streams != 1) {
303         av_log(s, AV_LOG_ERROR, "WAVE files have exactly one stream\n");
304         return AVERROR(EINVAL);
305     }
306
307     if (wav->rf64 == RF64_ALWAYS) {
308         ffio_wfourcc(pb, "RF64");
309         avio_wl32(pb, -1); /* RF64 chunk size: use size in ds64 */
310     } else {
311         ffio_wfourcc(pb, "RIFF");
312         avio_wl32(pb, -1); /* file length */
313     }
314
315     ffio_wfourcc(pb, "WAVE");
316
317     if (wav->rf64 != RF64_NEVER) {
318         /* write empty ds64 chunk or JUNK chunk to reserve space for ds64 */
319         ffio_wfourcc(pb, wav->rf64 == RF64_ALWAYS ? "ds64" : "JUNK");
320         avio_wl32(pb, 28); /* chunk size */
321         wav->ds64 = avio_tell(pb);
322         ffio_fill(pb, 0, 28);
323     }
324
325     if (wav->write_peak != PEAK_ONLY) {
326         /* format header */
327         fmt = ff_start_tag(pb, "fmt ");
328         if (ff_put_wav_header(s, pb, s->streams[0]->codecpar, 0) < 0) {
329             const AVCodecDescriptor *desc = avcodec_descriptor_get(s->streams[0]->codecpar->codec_id);
330             av_log(s, AV_LOG_ERROR, "%s codec not supported in WAVE format\n",
331                    desc ? desc->name : "unknown");
332             return AVERROR(ENOSYS);
333         }
334         ff_end_tag(pb, fmt);
335     }
336
337     if (s->streams[0]->codecpar->codec_tag != 0x01 /* hence for all other than PCM */
338         && (s->pb->seekable & AVIO_SEEKABLE_NORMAL)) {
339         wav->fact_pos = ff_start_tag(pb, "fact");
340         avio_wl32(pb, 0);
341         ff_end_tag(pb, wav->fact_pos);
342     }
343
344     if (wav->write_bext)
345         bwf_write_bext_chunk(s);
346
347     if (wav->write_peak) {
348         int ret;
349         if ((ret = peak_init_writer(s)) < 0)
350             return ret;
351     }
352
353     avpriv_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codecpar->sample_rate);
354     wav->maxpts = wav->last_duration = 0;
355     wav->minpts = INT64_MAX;
356
357     if (wav->write_peak != PEAK_ONLY) {
358         /* info header */
359         ff_riff_write_info(s);
360
361         /* data header */
362         wav->data = ff_start_tag(pb, "data");
363     }
364
365     avio_flush(pb);
366
367     return 0;
368 }
369
370 static int wav_write_packet(AVFormatContext *s, AVPacket *pkt)
371 {
372     AVIOContext *pb  = s->pb;
373     WAVMuxContext    *wav = s->priv_data;
374
375     if (wav->write_peak != PEAK_ONLY)
376         avio_write(pb, pkt->data, pkt->size);
377
378     if (wav->write_peak) {
379         int c = 0;
380         int i;
381         for (i = 0; i < pkt->size; i += wav->peak_bps) {
382             if (wav->peak_bps == 1) {
383                 wav->peak_maxpos[c] = FFMAX(wav->peak_maxpos[c], *(int8_t*)(pkt->data + i));
384                 wav->peak_maxneg[c] = FFMIN(wav->peak_maxneg[c], *(int8_t*)(pkt->data + i));
385             } else {
386                 wav->peak_maxpos[c] = FFMAX(wav->peak_maxpos[c], (int16_t)AV_RL16(pkt->data + i));
387                 wav->peak_maxneg[c] = FFMIN(wav->peak_maxneg[c], (int16_t)AV_RL16(pkt->data + i));
388             }
389             if (++c == s->streams[0]->codecpar->channels) {
390                 c = 0;
391                 if (++wav->peak_block_pos == wav->peak_block_size) {
392                     peak_write_frame(s);
393                     wav->peak_block_pos = 0;
394                 }
395             }
396         }
397     }
398
399     if(pkt->pts != AV_NOPTS_VALUE) {
400         wav->minpts        = FFMIN(wav->minpts, pkt->pts);
401         wav->maxpts        = FFMAX(wav->maxpts, pkt->pts);
402         wav->last_duration = pkt->duration;
403     } else
404         av_log(s, AV_LOG_ERROR, "wav_write_packet: NOPTS\n");
405     return 0;
406 }
407
408 static int wav_write_trailer(AVFormatContext *s)
409 {
410     AVIOContext *pb  = s->pb;
411     WAVMuxContext    *wav = s->priv_data;
412     int64_t file_size, data_size;
413     int64_t number_of_samples = 0;
414     int rf64 = 0;
415     int ret = 0;
416
417     avio_flush(pb);
418
419     if (s->pb->seekable & AVIO_SEEKABLE_NORMAL) {
420         if (wav->write_peak != PEAK_ONLY && avio_tell(pb) - wav->data < UINT32_MAX) {
421             ff_end_tag(pb, wav->data);
422             avio_flush(pb);
423         }
424
425         if (wav->write_peak && wav->peak_output) {
426             ret = peak_write_chunk(s);
427             avio_flush(pb);
428         }
429
430         /* update file size */
431         file_size = avio_tell(pb);
432         data_size = file_size - wav->data;
433         if (wav->rf64 == RF64_ALWAYS || (wav->rf64 == RF64_AUTO && file_size - 8 > UINT32_MAX)) {
434             rf64 = 1;
435         } else if (file_size - 8 <= UINT32_MAX) {
436             avio_seek(pb, 4, SEEK_SET);
437             avio_wl32(pb, (uint32_t)(file_size - 8));
438             avio_seek(pb, file_size, SEEK_SET);
439
440             avio_flush(pb);
441         } else {
442             av_log(s, AV_LOG_ERROR,
443                    "Filesize %"PRId64" invalid for wav, output file will be broken\n",
444                    file_size);
445         }
446
447         number_of_samples = av_rescale(wav->maxpts - wav->minpts + wav->last_duration,
448                                        s->streams[0]->codecpar->sample_rate * (int64_t)s->streams[0]->time_base.num,
449                                        s->streams[0]->time_base.den);
450
451         if(s->streams[0]->codecpar->codec_tag != 0x01) {
452             /* Update num_samps in fact chunk */
453             avio_seek(pb, wav->fact_pos, SEEK_SET);
454             if (rf64 || (wav->rf64 == RF64_AUTO && number_of_samples > UINT32_MAX)) {
455                 rf64 = 1;
456                 avio_wl32(pb, -1);
457             } else {
458                 avio_wl32(pb, number_of_samples);
459                 avio_seek(pb, file_size, SEEK_SET);
460                 avio_flush(pb);
461             }
462         }
463
464         if (rf64) {
465             /* overwrite RIFF with RF64 */
466             avio_seek(pb, 0, SEEK_SET);
467             ffio_wfourcc(pb, "RF64");
468             avio_wl32(pb, -1);
469
470             /* write ds64 chunk (overwrite JUNK if rf64 == RF64_AUTO) */
471             avio_seek(pb, wav->ds64 - 8, SEEK_SET);
472             ffio_wfourcc(pb, "ds64");
473             avio_wl32(pb, 28);                  /* ds64 chunk size */
474             avio_wl64(pb, file_size - 8);       /* RF64 chunk size */
475             avio_wl64(pb, data_size);           /* data chunk size */
476             avio_wl64(pb, number_of_samples);   /* fact chunk number of samples */
477             avio_wl32(pb, 0);                   /* number of table entries for non-'data' chunks */
478
479             /* write -1 in data chunk size */
480             avio_seek(pb, wav->data - 4, SEEK_SET);
481             avio_wl32(pb, -1);
482
483             avio_seek(pb, file_size, SEEK_SET);
484             avio_flush(pb);
485         }
486     }
487
488     if (wav->write_peak)
489         peak_free_buffers(s);
490
491     return ret;
492 }
493
494 #define OFFSET(x) offsetof(WAVMuxContext, x)
495 #define ENC AV_OPT_FLAG_ENCODING_PARAM
496 static const AVOption options[] = {
497     { "write_bext", "Write BEXT chunk.", OFFSET(write_bext), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, ENC },
498     { "write_peak", "Write Peak Envelope chunk.",            OFFSET(write_peak), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 2, ENC, "peak" },
499     { "off",        "Do not write peak chunk.",              0,                  AV_OPT_TYPE_CONST, { .i64 = PEAK_OFF  }, 0, 0, ENC, "peak" },
500     { "on",         "Append peak chunk after wav data.",     0,                  AV_OPT_TYPE_CONST, { .i64 = PEAK_ON   }, 0, 0, ENC, "peak" },
501     { "only",       "Write only peak chunk, omit wav data.", 0,                  AV_OPT_TYPE_CONST, { .i64 = PEAK_ONLY }, 0, 0, ENC, "peak" },
502     { "rf64",       "Use RF64 header rather than RIFF for large files.",    OFFSET(rf64), AV_OPT_TYPE_INT,   { .i64 = RF64_NEVER  },-1, 1, ENC, "rf64" },
503     { "auto",       "Write RF64 header if file grows large enough.",        0,            AV_OPT_TYPE_CONST, { .i64 = RF64_AUTO   }, 0, 0, ENC, "rf64" },
504     { "always",     "Always write RF64 header regardless of file size.",    0,            AV_OPT_TYPE_CONST, { .i64 = RF64_ALWAYS }, 0, 0, ENC, "rf64" },
505     { "never",      "Never write RF64 header regardless of file size.",     0,            AV_OPT_TYPE_CONST, { .i64 = RF64_NEVER  }, 0, 0, ENC, "rf64" },
506     { "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 },
507     { "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 },
508     { "peak_ppv",        "Number of peak points per peak value (1 or 2).",              OFFSET(peak_ppv), AV_OPT_TYPE_INT, { .i64 = 2 }, 1, 2, ENC },
509     { NULL },
510 };
511
512 static const AVClass wav_muxer_class = {
513     .class_name = "WAV muxer",
514     .item_name  = av_default_item_name,
515     .option     = options,
516     .version    = LIBAVUTIL_VERSION_INT,
517 };
518
519 AVOutputFormat ff_wav_muxer = {
520     .name              = "wav",
521     .long_name         = NULL_IF_CONFIG_SMALL("WAV / WAVE (Waveform Audio)"),
522     .mime_type         = "audio/x-wav",
523     .extensions        = "wav",
524     .priv_data_size    = sizeof(WAVMuxContext),
525     .audio_codec       = AV_CODEC_ID_PCM_S16LE,
526     .video_codec       = AV_CODEC_ID_NONE,
527     .write_header      = wav_write_header,
528     .write_packet      = wav_write_packet,
529     .write_trailer     = wav_write_trailer,
530     .flags             = AVFMT_TS_NONSTRICT,
531     .codec_tag         = (const AVCodecTag* const []){ ff_codec_wav_tags, 0 },
532     .priv_class        = &wav_muxer_class,
533 };
534 #endif /* CONFIG_WAV_MUXER */
535
536 #if CONFIG_W64_MUXER
537 #include "w64.h"
538
539 static void start_guid(AVIOContext *pb, const uint8_t *guid, int64_t *pos)
540 {
541     *pos = avio_tell(pb);
542
543     avio_write(pb, guid, 16);
544     avio_wl64(pb, INT64_MAX);
545 }
546
547 static void end_guid(AVIOContext *pb, int64_t start)
548 {
549     int64_t end, pos = avio_tell(pb);
550
551     end = FFALIGN(pos, 8);
552     ffio_fill(pb, 0, end - pos);
553     avio_seek(pb, start + 16, SEEK_SET);
554     avio_wl64(pb, end - start);
555     avio_seek(pb, end, SEEK_SET);
556 }
557
558 static int w64_write_header(AVFormatContext *s)
559 {
560     WAVMuxContext *wav = s->priv_data;
561     AVIOContext *pb = s->pb;
562     int64_t start;
563     int ret;
564
565     avio_write(pb, ff_w64_guid_riff, sizeof(ff_w64_guid_riff));
566     avio_wl64(pb, -1);
567     avio_write(pb, ff_w64_guid_wave, sizeof(ff_w64_guid_wave));
568     start_guid(pb, ff_w64_guid_fmt, &start);
569     if ((ret = ff_put_wav_header(s, pb, s->streams[0]->codecpar, 0)) < 0) {
570         AVCodec *codec = avcodec_find_decoder(s->streams[0]->codecpar->codec_id);
571         av_log(s, AV_LOG_ERROR, "%s codec not supported\n",
572                codec ? codec->name : "NONE");
573         return ret;
574     }
575     end_guid(pb, start);
576
577     if (s->streams[0]->codecpar->codec_tag != 0x01 /* hence for all other than PCM */
578         && (s->pb->seekable & AVIO_SEEKABLE_NORMAL)) {
579         start_guid(pb, ff_w64_guid_fact, &wav->fact_pos);
580         avio_wl64(pb, 0);
581         end_guid(pb, wav->fact_pos);
582     }
583
584     start_guid(pb, ff_w64_guid_data, &wav->data);
585
586     return 0;
587 }
588
589 static int w64_write_trailer(AVFormatContext *s)
590 {
591     AVIOContext    *pb = s->pb;
592     WAVMuxContext *wav = s->priv_data;
593     int64_t file_size;
594
595     if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
596         end_guid(pb, wav->data);
597
598         file_size = avio_tell(pb);
599         avio_seek(pb, 16, SEEK_SET);
600         avio_wl64(pb, file_size);
601
602         if (s->streams[0]->codecpar->codec_tag != 0x01) {
603             int64_t number_of_samples;
604
605             number_of_samples = av_rescale(wav->maxpts - wav->minpts + wav->last_duration,
606                                            s->streams[0]->codecpar->sample_rate * (int64_t)s->streams[0]->time_base.num,
607                                            s->streams[0]->time_base.den);
608             avio_seek(pb, wav->fact_pos + 24, SEEK_SET);
609             avio_wl64(pb, number_of_samples);
610         }
611
612         avio_seek(pb, file_size, SEEK_SET);
613         avio_flush(pb);
614     }
615
616     return 0;
617 }
618
619 AVOutputFormat ff_w64_muxer = {
620     .name              = "w64",
621     .long_name         = NULL_IF_CONFIG_SMALL("Sony Wave64"),
622     .extensions        = "w64",
623     .priv_data_size    = sizeof(WAVMuxContext),
624     .audio_codec       = AV_CODEC_ID_PCM_S16LE,
625     .video_codec       = AV_CODEC_ID_NONE,
626     .write_header      = w64_write_header,
627     .write_packet      = wav_write_packet,
628     .write_trailer     = w64_write_trailer,
629     .flags             = AVFMT_TS_NONSTRICT,
630     .codec_tag         = (const AVCodecTag* const []){ ff_codec_wav_tags, 0 },
631 };
632 #endif /* CONFIG_W64_MUXER */