avformat/wavenc: fix string length variable types
[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     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     int 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     size_t 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         int64_t i;
126         uint64_t umidpart;
127         size_t 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 int 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         if (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         } else {
278             av_log(s, AV_LOG_ERROR, "Failed to write timestamp\n");
279             return -1;
280         }
281     }
282
283     avio_wl32(pb, 1);                           /* version */
284     avio_wl32(pb, wav->peak_format);            /* 8 or 16 bit */
285     avio_wl32(pb, wav->peak_ppv);               /* positive and negative */
286     avio_wl32(pb, wav->peak_block_size);        /* frames per value */
287     avio_wl32(pb, enc->channels);               /* number of channels */
288     avio_wl32(pb, wav->peak_num_frames);        /* number of peak frames */
289     avio_wl32(pb, wav->peak_pos_pop);           /* audio sample frame index */
290     avio_wl32(pb, 128);                         /* equal to size of header */
291     avio_write(pb, timestamp, 28);              /* ASCII time stamp */
292     ffio_fill(pb, 0, 60);
293
294     avio_write(pb, wav->peak_output, wav->peak_outbuf_bytes);
295
296     ff_end_tag(pb, peak);
297
298     if (!wav->data)
299         wav->data = peak;
300
301     return 0;
302 }
303
304 static int wav_write_header(AVFormatContext *s)
305 {
306     WAVMuxContext *wav = s->priv_data;
307     AVIOContext *pb = s->pb;
308     int64_t fmt;
309
310     if (s->nb_streams != 1) {
311         av_log(s, AV_LOG_ERROR, "WAVE files have exactly one stream\n");
312         return AVERROR(EINVAL);
313     }
314
315     if (wav->rf64 == RF64_ALWAYS) {
316         ffio_wfourcc(pb, "RF64");
317         avio_wl32(pb, -1); /* RF64 chunk size: use size in ds64 */
318     } else {
319         ffio_wfourcc(pb, "RIFF");
320         avio_wl32(pb, -1); /* file length */
321     }
322
323     ffio_wfourcc(pb, "WAVE");
324
325     if (wav->rf64 != RF64_NEVER) {
326         /* write empty ds64 chunk or JUNK chunk to reserve space for ds64 */
327         ffio_wfourcc(pb, wav->rf64 == RF64_ALWAYS ? "ds64" : "JUNK");
328         avio_wl32(pb, 28); /* chunk size */
329         wav->ds64 = avio_tell(pb);
330         ffio_fill(pb, 0, 28);
331     }
332
333     if (wav->write_peak != 2) {
334         /* format header */
335         fmt = ff_start_tag(pb, "fmt ");
336         if (ff_put_wav_header(pb, s->streams[0]->codec, 0) < 0) {
337             const AVCodecDescriptor *desc = avcodec_descriptor_get(s->streams[0]->codec->codec_id);
338             av_log(s, AV_LOG_ERROR, "%s codec not supported in WAVE format\n",
339                    desc ? desc->name : "unknown");
340             return AVERROR(ENOSYS);
341         }
342         ff_end_tag(pb, fmt);
343     }
344
345     if (s->streams[0]->codec->codec_tag != 0x01 /* hence for all other than PCM */
346         && s->pb->seekable) {
347         wav->fact_pos = ff_start_tag(pb, "fact");
348         avio_wl32(pb, 0);
349         ff_end_tag(pb, wav->fact_pos);
350     }
351
352     if (wav->write_bext)
353         bwf_write_bext_chunk(s);
354
355     if (wav->write_peak) {
356         int ret;
357         if ((ret = peak_init_writer(s)) < 0)
358             return ret;
359     }
360
361     avpriv_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codec->sample_rate);
362     wav->maxpts = wav->last_duration = 0;
363     wav->minpts = INT64_MAX;
364
365     if (wav->write_peak != 2) {
366         /* info header */
367         ff_riff_write_info(s);
368
369         /* data header */
370         wav->data = ff_start_tag(pb, "data");
371     }
372
373     avio_flush(pb);
374
375     return 0;
376 }
377
378 static int wav_write_packet(AVFormatContext *s, AVPacket *pkt)
379 {
380     AVIOContext *pb  = s->pb;
381     WAVMuxContext    *wav = s->priv_data;
382
383     if (wav->write_peak != 2)
384         avio_write(pb, pkt->data, pkt->size);
385
386     if (wav->write_peak) {
387         int c = 0;
388         int i;
389         for (i = 0; i < pkt->size; i += wav->peak_bps) {
390             if (wav->peak_bps == 1) {
391                 wav->peak_maxpos[c] = FFMAX(wav->peak_maxpos[c], *(int8_t*)(pkt->data + i));
392                 wav->peak_maxneg[c] = FFMIN(wav->peak_maxneg[c], *(int8_t*)(pkt->data + i));
393             } else {
394                 wav->peak_maxpos[c] = FFMAX(wav->peak_maxpos[c], (int16_t)AV_RL16(pkt->data + i));
395                 wav->peak_maxneg[c] = FFMIN(wav->peak_maxneg[c], (int16_t)AV_RL16(pkt->data + i));
396             }
397             if (++c == s->streams[0]->codec->channels) {
398                 c = 0;
399                 if (++wav->peak_block_pos == wav->peak_block_size) {
400                     peak_write_frame(s);
401                     wav->peak_block_pos = 0;
402                 }
403             }
404         }
405     }
406
407     if(pkt->pts != AV_NOPTS_VALUE) {
408         wav->minpts        = FFMIN(wav->minpts, pkt->pts);
409         wav->maxpts        = FFMAX(wav->maxpts, pkt->pts);
410         wav->last_duration = pkt->duration;
411     } else
412         av_log(s, AV_LOG_ERROR, "wav_write_packet: NOPTS\n");
413     return 0;
414 }
415
416 static int wav_write_trailer(AVFormatContext *s)
417 {
418     AVIOContext *pb  = s->pb;
419     WAVMuxContext    *wav = s->priv_data;
420     int64_t file_size, data_size;
421     int64_t number_of_samples = 0;
422     int rf64 = 0;
423     int ret = 0;
424
425     avio_flush(pb);
426
427     if (s->pb->seekable) {
428         if (wav->write_peak != 2) {
429             ff_end_tag(pb, wav->data);
430             avio_flush(pb);
431         }
432
433         if (wav->write_peak && wav->peak_output) {
434             ret = peak_write_chunk(s);
435             avio_flush(pb);
436         }
437
438         /* update file size */
439         file_size = avio_tell(pb);
440         data_size = file_size - wav->data;
441         if (wav->rf64 == RF64_ALWAYS || (wav->rf64 == RF64_AUTO && file_size - 8 > UINT32_MAX)) {
442             rf64 = 1;
443         } else {
444             avio_seek(pb, 4, SEEK_SET);
445             avio_wl32(pb, (uint32_t)(file_size - 8));
446             avio_seek(pb, file_size, SEEK_SET);
447
448             avio_flush(pb);
449         }
450
451         number_of_samples = av_rescale(wav->maxpts - wav->minpts + wav->last_duration,
452                                        s->streams[0]->codec->sample_rate * (int64_t)s->streams[0]->time_base.num,
453                                        s->streams[0]->time_base.den);
454
455         if(s->streams[0]->codec->codec_tag != 0x01) {
456             /* Update num_samps in fact chunk */
457             avio_seek(pb, wav->fact_pos, SEEK_SET);
458             if (rf64 || (wav->rf64 == RF64_AUTO && number_of_samples > UINT32_MAX)) {
459                 rf64 = 1;
460                 avio_wl32(pb, -1);
461             } else {
462                 avio_wl32(pb, number_of_samples);
463                 avio_seek(pb, file_size, SEEK_SET);
464                 avio_flush(pb);
465             }
466         }
467
468         if (rf64) {
469             /* overwrite RIFF with RF64 */
470             avio_seek(pb, 0, SEEK_SET);
471             ffio_wfourcc(pb, "RF64");
472             avio_wl32(pb, -1);
473
474             /* write ds64 chunk (overwrite JUNK if rf64 == RF64_AUTO) */
475             avio_seek(pb, wav->ds64 - 8, SEEK_SET);
476             ffio_wfourcc(pb, "ds64");
477             avio_wl32(pb, 28);                  /* ds64 chunk size */
478             avio_wl64(pb, file_size - 8);       /* RF64 chunk size */
479             avio_wl64(pb, data_size);           /* data chunk size */
480             avio_wl64(pb, number_of_samples);   /* fact chunk number of samples */
481             avio_wl32(pb, 0);                   /* number of table entries for non-'data' chunks */
482
483             /* write -1 in data chunk size */
484             avio_seek(pb, wav->data - 4, SEEK_SET);
485             avio_wl32(pb, -1);
486
487             avio_seek(pb, file_size, SEEK_SET);
488             avio_flush(pb);
489         }
490     }
491
492     if (wav->write_peak)
493         peak_free_buffers(s);
494
495     return ret;
496 }
497
498 #define OFFSET(x) offsetof(WAVMuxContext, x)
499 #define ENC AV_OPT_FLAG_ENCODING_PARAM
500 static const AVOption options[] = {
501     { "write_bext", "Write BEXT chunk.", OFFSET(write_bext), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, ENC },
502     { "write_peak", "Write Peak Envelope chunk.",            OFFSET(write_peak), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 2, ENC, "peak" },
503     { "off",        "Do not write peak chunk.",              0,                  AV_OPT_TYPE_CONST, { .i64 = PEAK_OFF  }, 0, 0, ENC, "peak" },
504     { "on",         "Append peak chunk after wav data.",     0,                  AV_OPT_TYPE_CONST, { .i64 = PEAK_ON   }, 0, 0, ENC, "peak" },
505     { "only",       "Write only peak chunk, omit wav data.", 0,                  AV_OPT_TYPE_CONST, { .i64 = PEAK_ONLY }, 0, 0, ENC, "peak" },
506     { "rf64",       "Use RF64 header rather than RIFF for large files.",    OFFSET(rf64), AV_OPT_TYPE_INT,   { .i64 = RF64_NEVER  },-1, 1, ENC, "rf64" },
507     { "auto",       "Write RF64 header if file grows large enough.",        0,            AV_OPT_TYPE_CONST, { .i64 = RF64_AUTO   }, 0, 0, ENC, "rf64" },
508     { "always",     "Always write RF64 header regardless of file size.",    0,            AV_OPT_TYPE_CONST, { .i64 = RF64_ALWAYS }, 0, 0, ENC, "rf64" },
509     { "never",      "Never write RF64 header regardless of file size.",     0,            AV_OPT_TYPE_CONST, { .i64 = RF64_NEVER  }, 0, 0, ENC, "rf64" },
510     { "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 },
511     { "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 },
512     { "peak_ppv",        "Number of peak points per peak value (1 or 2).",              OFFSET(peak_ppv), AV_OPT_TYPE_INT, { .i64 = 2 }, 1, 2, ENC },
513     { NULL },
514 };
515
516 static const AVClass wav_muxer_class = {
517     .class_name = "WAV muxer",
518     .item_name  = av_default_item_name,
519     .option     = options,
520     .version    = LIBAVUTIL_VERSION_INT,
521 };
522
523 AVOutputFormat ff_wav_muxer = {
524     .name              = "wav",
525     .long_name         = NULL_IF_CONFIG_SMALL("WAV / WAVE (Waveform Audio)"),
526     .mime_type         = "audio/x-wav",
527     .extensions        = "wav",
528     .priv_data_size    = sizeof(WAVMuxContext),
529     .audio_codec       = AV_CODEC_ID_PCM_S16LE,
530     .video_codec       = AV_CODEC_ID_NONE,
531     .write_header      = wav_write_header,
532     .write_packet      = wav_write_packet,
533     .write_trailer     = wav_write_trailer,
534     .flags             = AVFMT_TS_NONSTRICT,
535     .codec_tag         = (const AVCodecTag* const []){ ff_codec_wav_tags, 0 },
536     .priv_class        = &wav_muxer_class,
537 };
538 #endif /* CONFIG_WAV_MUXER */
539
540 #if CONFIG_W64_MUXER
541 #include "w64.h"
542
543 static void start_guid(AVIOContext *pb, const uint8_t *guid, int64_t *pos)
544 {
545     *pos = avio_tell(pb);
546
547     avio_write(pb, guid, 16);
548     avio_wl64(pb, INT64_MAX);
549 }
550
551 static void end_guid(AVIOContext *pb, int64_t start)
552 {
553     int64_t end, pos = avio_tell(pb);
554
555     end = FFALIGN(pos, 8);
556     ffio_fill(pb, 0, end - pos);
557     avio_seek(pb, start + 16, SEEK_SET);
558     avio_wl64(pb, end - start);
559     avio_seek(pb, end, SEEK_SET);
560 }
561
562 static int w64_write_header(AVFormatContext *s)
563 {
564     WAVMuxContext *wav = s->priv_data;
565     AVIOContext *pb = s->pb;
566     int64_t start;
567     int ret;
568
569     avio_write(pb, ff_w64_guid_riff, sizeof(ff_w64_guid_riff));
570     avio_wl64(pb, -1);
571     avio_write(pb, ff_w64_guid_wave, sizeof(ff_w64_guid_wave));
572     start_guid(pb, ff_w64_guid_fmt, &start);
573     if ((ret = ff_put_wav_header(pb, s->streams[0]->codec, 0)) < 0) {
574         av_log(s, AV_LOG_ERROR, "%s codec not supported\n",
575                s->streams[0]->codec->codec ? s->streams[0]->codec->codec->name : "NONE");
576         return ret;
577     }
578     end_guid(pb, start);
579
580     if (s->streams[0]->codec->codec_tag != 0x01 /* hence for all other than PCM */
581         && s->pb->seekable) {
582         start_guid(pb, ff_w64_guid_fact, &wav->fact_pos);
583         avio_wl64(pb, 0);
584         end_guid(pb, wav->fact_pos);
585     }
586
587     start_guid(pb, ff_w64_guid_data, &wav->data);
588
589     return 0;
590 }
591
592 static int w64_write_trailer(AVFormatContext *s)
593 {
594     AVIOContext    *pb = s->pb;
595     WAVMuxContext *wav = s->priv_data;
596     int64_t file_size;
597
598     if (pb->seekable) {
599         end_guid(pb, wav->data);
600
601         file_size = avio_tell(pb);
602         avio_seek(pb, 16, SEEK_SET);
603         avio_wl64(pb, file_size);
604
605         if (s->streams[0]->codec->codec_tag != 0x01) {
606             int64_t number_of_samples;
607
608             number_of_samples = av_rescale(wav->maxpts - wav->minpts + wav->last_duration,
609                                            s->streams[0]->codec->sample_rate * (int64_t)s->streams[0]->time_base.num,
610                                            s->streams[0]->time_base.den);
611             avio_seek(pb, wav->fact_pos + 24, SEEK_SET);
612             avio_wl64(pb, number_of_samples);
613         }
614
615         avio_seek(pb, file_size, SEEK_SET);
616         avio_flush(pb);
617     }
618
619     return 0;
620 }
621
622 AVOutputFormat ff_w64_muxer = {
623     .name              = "w64",
624     .long_name         = NULL_IF_CONFIG_SMALL("Sony Wave64"),
625     .extensions        = "w64",
626     .priv_data_size    = sizeof(WAVMuxContext),
627     .audio_codec       = AV_CODEC_ID_PCM_S16LE,
628     .video_codec       = AV_CODEC_ID_NONE,
629     .write_header      = w64_write_header,
630     .write_packet      = wav_write_packet,
631     .write_trailer     = w64_write_trailer,
632     .flags             = AVFMT_TS_NONSTRICT,
633     .codec_tag         = (const AVCodecTag* const []){ ff_codec_wav_tags, 0 },
634 };
635 #endif /* CONFIG_W64_MUXER */