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avformat: remove unneeded avio_flush() calls from the end of write_trailer functions
[ffmpeg] / 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     avio_flush(pb);
415
416     if (s->pb->seekable & AVIO_SEEKABLE_NORMAL) {
417         if (wav->write_peak != PEAK_ONLY && avio_tell(pb) - wav->data < UINT32_MAX) {
418             ff_end_tag(pb, wav->data);
419             avio_flush(pb);
420         }
421
422         if (wav->write_peak && wav->peak_output) {
423             ret = peak_write_chunk(s);
424             avio_flush(pb);
425         }
426
427         /* update file size */
428         file_size = avio_tell(pb);
429         data_size = file_size - wav->data;
430         if (wav->rf64 == RF64_ALWAYS || (wav->rf64 == RF64_AUTO && file_size - 8 > UINT32_MAX)) {
431             rf64 = 1;
432         } else if (file_size - 8 <= UINT32_MAX) {
433             avio_seek(pb, 4, SEEK_SET);
434             avio_wl32(pb, (uint32_t)(file_size - 8));
435             avio_seek(pb, file_size, SEEK_SET);
436
437             avio_flush(pb);
438         } else {
439             av_log(s, AV_LOG_ERROR,
440                    "Filesize %"PRId64" invalid for wav, output file will be broken\n",
441                    file_size);
442         }
443
444         number_of_samples = av_rescale(wav->maxpts - wav->minpts + wav->last_duration,
445                                        s->streams[0]->codecpar->sample_rate * (int64_t)s->streams[0]->time_base.num,
446                                        s->streams[0]->time_base.den);
447
448         if(s->streams[0]->codecpar->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         }
482     }
483
484     return ret;
485 }
486
487 #define OFFSET(x) offsetof(WAVMuxContext, x)
488 #define ENC AV_OPT_FLAG_ENCODING_PARAM
489 static const AVOption options[] = {
490     { "write_bext", "Write BEXT chunk.", OFFSET(write_bext), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, ENC },
491     { "write_peak", "Write Peak Envelope chunk.",            OFFSET(write_peak), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 2, ENC, "peak" },
492     { "off",        "Do not write peak chunk.",              0,                  AV_OPT_TYPE_CONST, { .i64 = PEAK_OFF  }, 0, 0, ENC, "peak" },
493     { "on",         "Append peak chunk after wav data.",     0,                  AV_OPT_TYPE_CONST, { .i64 = PEAK_ON   }, 0, 0, ENC, "peak" },
494     { "only",       "Write only peak chunk, omit wav data.", 0,                  AV_OPT_TYPE_CONST, { .i64 = PEAK_ONLY }, 0, 0, ENC, "peak" },
495     { "rf64",       "Use RF64 header rather than RIFF for large files.",    OFFSET(rf64), AV_OPT_TYPE_INT,   { .i64 = RF64_NEVER  },-1, 1, ENC, "rf64" },
496     { "auto",       "Write RF64 header if file grows large enough.",        0,            AV_OPT_TYPE_CONST, { .i64 = RF64_AUTO   }, 0, 0, ENC, "rf64" },
497     { "always",     "Always write RF64 header regardless of file size.",    0,            AV_OPT_TYPE_CONST, { .i64 = RF64_ALWAYS }, 0, 0, ENC, "rf64" },
498     { "never",      "Never write RF64 header regardless of file size.",     0,            AV_OPT_TYPE_CONST, { .i64 = RF64_NEVER  }, 0, 0, ENC, "rf64" },
499     { "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 },
500     { "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 },
501     { "peak_ppv",        "Number of peak points per peak value (1 or 2).",              OFFSET(peak_ppv), AV_OPT_TYPE_INT, { .i64 = 2 }, 1, 2, ENC },
502     { NULL },
503 };
504
505 static const AVClass wav_muxer_class = {
506     .class_name = "WAV muxer",
507     .item_name  = av_default_item_name,
508     .option     = options,
509     .version    = LIBAVUTIL_VERSION_INT,
510 };
511
512 AVOutputFormat ff_wav_muxer = {
513     .name              = "wav",
514     .long_name         = NULL_IF_CONFIG_SMALL("WAV / WAVE (Waveform Audio)"),
515     .mime_type         = "audio/x-wav",
516     .extensions        = "wav",
517     .priv_data_size    = sizeof(WAVMuxContext),
518     .audio_codec       = AV_CODEC_ID_PCM_S16LE,
519     .video_codec       = AV_CODEC_ID_NONE,
520     .write_header      = wav_write_header,
521     .write_packet      = wav_write_packet,
522     .write_trailer     = wav_write_trailer,
523     .deinit            = wav_deinit,
524     .flags             = AVFMT_TS_NONSTRICT,
525     .codec_tag         = (const AVCodecTag* const []){ ff_codec_wav_tags, 0 },
526     .priv_class        = &wav_muxer_class,
527 };
528 #endif /* CONFIG_WAV_MUXER */
529
530 #if CONFIG_W64_MUXER
531 #include "w64.h"
532
533 static void start_guid(AVIOContext *pb, const uint8_t *guid, int64_t *pos)
534 {
535     *pos = avio_tell(pb);
536
537     avio_write(pb, guid, 16);
538     avio_wl64(pb, INT64_MAX);
539 }
540
541 static void end_guid(AVIOContext *pb, int64_t start)
542 {
543     int64_t end, pos = avio_tell(pb);
544
545     end = FFALIGN(pos, 8);
546     ffio_fill(pb, 0, end - pos);
547     avio_seek(pb, start + 16, SEEK_SET);
548     avio_wl64(pb, end - start);
549     avio_seek(pb, end, SEEK_SET);
550 }
551
552 static int w64_write_header(AVFormatContext *s)
553 {
554     WAVMuxContext *wav = s->priv_data;
555     AVIOContext *pb = s->pb;
556     int64_t start;
557     int ret;
558
559     avio_write(pb, ff_w64_guid_riff, sizeof(ff_w64_guid_riff));
560     avio_wl64(pb, -1);
561     avio_write(pb, ff_w64_guid_wave, sizeof(ff_w64_guid_wave));
562     start_guid(pb, ff_w64_guid_fmt, &start);
563     if ((ret = ff_put_wav_header(s, pb, s->streams[0]->codecpar, 0)) < 0) {
564         AVCodec *codec = avcodec_find_decoder(s->streams[0]->codecpar->codec_id);
565         av_log(s, AV_LOG_ERROR, "%s codec not supported\n",
566                codec ? codec->name : "NONE");
567         return ret;
568     }
569     end_guid(pb, start);
570
571     if (s->streams[0]->codecpar->codec_tag != 0x01 /* hence for all other than PCM */
572         && (s->pb->seekable & AVIO_SEEKABLE_NORMAL)) {
573         start_guid(pb, ff_w64_guid_fact, &wav->fact_pos);
574         avio_wl64(pb, 0);
575         end_guid(pb, wav->fact_pos);
576     }
577
578     start_guid(pb, ff_w64_guid_data, &wav->data);
579
580     return 0;
581 }
582
583 static int w64_write_trailer(AVFormatContext *s)
584 {
585     AVIOContext    *pb = s->pb;
586     WAVMuxContext *wav = s->priv_data;
587     int64_t file_size;
588
589     if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
590         end_guid(pb, wav->data);
591
592         file_size = avio_tell(pb);
593         avio_seek(pb, 16, SEEK_SET);
594         avio_wl64(pb, file_size);
595
596         if (s->streams[0]->codecpar->codec_tag != 0x01) {
597             int64_t number_of_samples;
598
599             number_of_samples = av_rescale(wav->maxpts - wav->minpts + wav->last_duration,
600                                            s->streams[0]->codecpar->sample_rate * (int64_t)s->streams[0]->time_base.num,
601                                            s->streams[0]->time_base.den);
602             avio_seek(pb, wav->fact_pos + 24, SEEK_SET);
603             avio_wl64(pb, number_of_samples);
604         }
605
606         avio_seek(pb, file_size, SEEK_SET);
607     }
608
609     return 0;
610 }
611
612 AVOutputFormat ff_w64_muxer = {
613     .name              = "w64",
614     .long_name         = NULL_IF_CONFIG_SMALL("Sony Wave64"),
615     .extensions        = "w64",
616     .priv_data_size    = sizeof(WAVMuxContext),
617     .audio_codec       = AV_CODEC_ID_PCM_S16LE,
618     .video_codec       = AV_CODEC_ID_NONE,
619     .write_header      = w64_write_header,
620     .write_packet      = wav_write_packet,
621     .write_trailer     = w64_write_trailer,
622     .flags             = AVFMT_TS_NONSTRICT,
623     .codec_tag         = (const AVCodecTag* const []){ ff_codec_wav_tags, 0 },
624 };
625 #endif /* CONFIG_W64_MUXER */