avformat/wavenc: simplify malloc failure checking
[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
42 #include "avformat.h"
43 #include "avio.h"
44 #include "avio_internal.h"
45 #include "internal.h"
46 #include "riff.h"
47
48 #define RF64_AUTO   (-1)
49 #define RF64_NEVER  0
50 #define RF64_ALWAYS 1
51
52 #define PEAK_BUFFER_SIZE   1024
53
54 typedef enum {
55     PEAK_OFF = 0,
56     PEAK_ON,
57     PEAK_ONLY
58 } PeakType;
59
60 typedef enum {
61     PEAK_FORMAT_UINT8 = 1,
62     PEAK_FORMAT_UINT16
63 } PeakFormat;
64
65 typedef struct WAVMuxContext {
66     const AVClass *class;
67     int64_t data;
68     int64_t fact_pos;
69     int64_t ds64;
70     int64_t minpts;
71     int64_t maxpts;
72     int16_t *peak_maxpos, *peak_maxneg;
73     uint32_t peak_num_frames;
74     uint32_t peak_outbuf_size;
75     uint32_t peak_outbuf_bytes;
76     uint32_t peak_pos_pop;
77     uint16_t peak_pop;
78     uint8_t *peak_output;
79     int last_duration;
80     int write_bext;
81     int write_peak;
82     int rf64;
83     int peak_block_size;
84     PeakFormat peak_format;
85     int peak_block_pos;
86     int peak_ppv;
87     int peak_bps;
88 } WAVMuxContext;
89
90 #if CONFIG_WAV_MUXER
91 static inline void bwf_write_bext_string(AVFormatContext *s, const char *key, int maxlen)
92 {
93     AVDictionaryEntry *tag;
94     int len = 0;
95
96     if (tag = av_dict_get(s->metadata, key, NULL, 0)) {
97         len = strlen(tag->value);
98         len = FFMIN(len, maxlen);
99         avio_write(s->pb, tag->value, len);
100     }
101
102     ffio_fill(s->pb, 0, maxlen - len);
103 }
104
105 static void bwf_write_bext_chunk(AVFormatContext *s)
106 {
107     AVDictionaryEntry *tmp_tag;
108     uint64_t time_reference = 0;
109     int64_t bext = ff_start_tag(s->pb, "bext");
110
111     bwf_write_bext_string(s, "description", 256);
112     bwf_write_bext_string(s, "originator", 32);
113     bwf_write_bext_string(s, "originator_reference", 32);
114     bwf_write_bext_string(s, "origination_date", 10);
115     bwf_write_bext_string(s, "origination_time", 8);
116
117     if (tmp_tag = av_dict_get(s->metadata, "time_reference", NULL, 0))
118         time_reference = strtoll(tmp_tag->value, NULL, 10);
119     avio_wl64(s->pb, time_reference);
120     avio_wl16(s->pb, 1);  // set version to 1
121
122     if (tmp_tag = av_dict_get(s->metadata, "umid", NULL, 0)) {
123         unsigned char umidpart_str[17] = {0};
124         int i;
125         uint64_t umidpart;
126         int len = strlen(tmp_tag->value+2);
127
128         for (i = 0; i < len/16; i++) {
129             memcpy(umidpart_str, tmp_tag->value + 2 + (i*16), 16);
130             umidpart = strtoll(umidpart_str, NULL, 16);
131             avio_wb64(s->pb, umidpart);
132         }
133         ffio_fill(s->pb, 0, 64 - i*8);
134     } else
135         ffio_fill(s->pb, 0, 64); // zero UMID
136
137     ffio_fill(s->pb, 0, 190); // Reserved
138
139     if (tmp_tag = av_dict_get(s->metadata, "coding_history", NULL, 0))
140         avio_put_str(s->pb, tmp_tag->value);
141
142     ff_end_tag(s->pb, bext);
143 }
144
145 static av_cold void peak_free_buffers(AVFormatContext *s)
146 {
147     WAVMuxContext *wav = s->priv_data;
148
149     av_freep(&wav->peak_maxpos);
150     av_freep(&wav->peak_maxneg);
151     av_freep(&wav->peak_output);
152 }
153
154 static av_cold int peak_init_writer(AVFormatContext *s)
155 {
156     WAVMuxContext *wav = s->priv_data;
157     AVCodecContext *enc = s->streams[0]->codec;
158
159     if (enc->codec_id != AV_CODEC_ID_PCM_S8 &&
160         enc->codec_id != AV_CODEC_ID_PCM_S16LE &&
161         enc->codec_id != AV_CODEC_ID_PCM_U8 &&
162         enc->codec_id != AV_CODEC_ID_PCM_U16LE) {
163         av_log(s, AV_LOG_ERROR, "%s codec not supported for Peak Chunk\n",
164                s->streams[0]->codec->codec ? s->streams[0]->codec->codec->name : "NONE");
165         return -1;
166     }
167
168     wav->peak_bps = av_get_bits_per_sample(enc->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(enc->channels * sizeof(*wav->peak_maxpos));
177     wav->peak_maxneg = av_mallocz(enc->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     AVCodecContext *enc = s->streams[0]->codec;
196     int peak_of_peaks;
197     int c;
198
199     if (!wav->peak_output)
200         return;
201
202     for (c = 0; c < enc->channels; c++) {
203         wav->peak_maxneg[c] = -wav->peak_maxneg[c];
204
205         if (wav->peak_bps == 2 && wav->peak_format == PEAK_FORMAT_UINT8) {
206             wav->peak_maxpos[c] = wav->peak_maxpos[c] / 256;
207             wav->peak_maxneg[c] = wav->peak_maxneg[c] / 256;
208         }
209
210         if (wav->peak_ppv == 1)
211             wav->peak_maxpos[c] =
212                 FFMAX(wav->peak_maxpos[c], wav->peak_maxneg[c]);
213
214         peak_of_peaks = FFMAX3(wav->peak_maxpos[c], wav->peak_maxneg[c],
215                                wav->peak_pop);
216         if (peak_of_peaks > wav->peak_pop)
217             wav->peak_pos_pop = wav->peak_num_frames;
218         wav->peak_pop = peak_of_peaks;
219
220         if (wav->peak_outbuf_size - wav->peak_outbuf_bytes <
221             wav->peak_format * wav->peak_ppv) {
222             wav->peak_outbuf_size += PEAK_BUFFER_SIZE;
223             wav->peak_output = av_realloc(wav->peak_output,
224                                           wav->peak_outbuf_size);
225             if (!wav->peak_output) {
226                 av_log(s, AV_LOG_ERROR, "No memory for peak data\n");
227                 return;
228             }
229         }
230
231         if (wav->peak_format == PEAK_FORMAT_UINT8) {
232             wav->peak_output[wav->peak_outbuf_bytes++] =
233                 wav->peak_maxpos[c];
234             if (wav->peak_ppv == 2) {
235                 wav->peak_output[wav->peak_outbuf_bytes++] =
236                     wav->peak_maxneg[c];
237             }
238         } else {
239             AV_WL16(wav->peak_output + wav->peak_outbuf_bytes,
240                     wav->peak_maxpos[c]);
241             wav->peak_outbuf_bytes += 2;
242             if (wav->peak_ppv == 2) {
243                 AV_WL16(wav->peak_output + wav->peak_outbuf_bytes,
244                         wav->peak_maxneg[c]);
245                 wav->peak_outbuf_bytes += 2;
246             }
247         }
248         wav->peak_maxpos[c] = 0;
249         wav->peak_maxneg[c] = 0;
250     }
251     wav->peak_num_frames++;
252 }
253
254 static void peak_write_chunk(AVFormatContext *s)
255 {
256     WAVMuxContext *wav = s->priv_data;
257     AVIOContext *pb = s->pb;
258     AVCodecContext *enc = s->streams[0]->codec;
259     int64_t peak = ff_start_tag(s->pb, "levl");
260     int64_t now0;
261     time_t now_secs;
262     char timestamp[28];
263
264     /* Peak frame of incomplete block at end */
265     if (wav->peak_block_pos)
266         peak_write_frame(s);
267
268     memset(timestamp, 0, sizeof(timestamp));
269     if (!(s->flags & AVFMT_FLAG_BITEXACT)) {
270         av_log(s, AV_LOG_INFO, "Writing local time and date to Peak Envelope Chunk\n");
271         now0 = av_gettime();
272         now_secs = now0 / 1000000;
273         strftime(timestamp, sizeof(timestamp), "%Y:%m:%d:%H:%M:%S:", localtime(&now_secs));
274         av_strlcatf(timestamp, sizeof(timestamp), "%03d", (int)((now0 / 1000) % 1000));
275     }
276
277     avio_wl32(pb, 1);                           /* version */
278     avio_wl32(pb, wav->peak_format);            /* 8 or 16 bit */
279     avio_wl32(pb, wav->peak_ppv);               /* positive and negative */
280     avio_wl32(pb, wav->peak_block_size);        /* frames per value */
281     avio_wl32(pb, enc->channels);               /* number of channels */
282     avio_wl32(pb, wav->peak_num_frames);        /* number of peak frames */
283     avio_wl32(pb, wav->peak_pos_pop);           /* audio sample frame index */
284     avio_wl32(pb, 128);                         /* equal to size of header */
285     avio_write(pb, timestamp, 28);              /* ASCII time stamp */
286     ffio_fill(pb, 0, 60);
287
288     avio_write(pb, wav->peak_output, wav->peak_outbuf_bytes);
289
290     ff_end_tag(pb, peak);
291
292     if (!wav->data)
293         wav->data = peak;
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 != 2) {
326         /* format header */
327         fmt = ff_start_tag(pb, "fmt ");
328         if (ff_put_wav_header(pb, s->streams[0]->codec, 0) < 0) {
329             const AVCodecDescriptor *desc = avcodec_descriptor_get(s->streams[0]->codec->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]->codec->codec_tag != 0x01 /* hence for all other than PCM */
338         && s->pb->seekable) {
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]->codec->sample_rate);
354     wav->maxpts = wav->last_duration = 0;
355     wav->minpts = INT64_MAX;
356
357     if (wav->write_peak != 2) {
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 != 2)
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]->codec->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
416     avio_flush(pb);
417
418     if (s->pb->seekable) {
419         if (wav->write_peak != 2) {
420             ff_end_tag(pb, wav->data);
421             avio_flush(pb);
422         }
423
424         if (wav->write_peak && wav->peak_output) {
425             peak_write_chunk(s);
426             avio_flush(pb);
427         }
428
429         /* update file size */
430         file_size = avio_tell(pb);
431         data_size = file_size - wav->data;
432         if (wav->rf64 == RF64_ALWAYS || (wav->rf64 == RF64_AUTO && file_size - 8 > UINT32_MAX)) {
433             rf64 = 1;
434         } else {
435             avio_seek(pb, 4, SEEK_SET);
436             avio_wl32(pb, (uint32_t)(file_size - 8));
437             avio_seek(pb, file_size, SEEK_SET);
438
439             avio_flush(pb);
440         }
441
442         number_of_samples = av_rescale(wav->maxpts - wav->minpts + wav->last_duration,
443                                        s->streams[0]->codec->sample_rate * (int64_t)s->streams[0]->time_base.num,
444                                        s->streams[0]->time_base.den);
445
446         if(s->streams[0]->codec->codec_tag != 0x01) {
447             /* Update num_samps in fact chunk */
448             avio_seek(pb, wav->fact_pos, SEEK_SET);
449             if (rf64 || (wav->rf64 == RF64_AUTO && number_of_samples > UINT32_MAX)) {
450                 rf64 = 1;
451                 avio_wl32(pb, -1);
452             } else {
453                 avio_wl32(pb, number_of_samples);
454                 avio_seek(pb, file_size, SEEK_SET);
455                 avio_flush(pb);
456             }
457         }
458
459         if (rf64) {
460             /* overwrite RIFF with RF64 */
461             avio_seek(pb, 0, SEEK_SET);
462             ffio_wfourcc(pb, "RF64");
463             avio_wl32(pb, -1);
464
465             /* write ds64 chunk (overwrite JUNK if rf64 == RF64_AUTO) */
466             avio_seek(pb, wav->ds64 - 8, SEEK_SET);
467             ffio_wfourcc(pb, "ds64");
468             avio_wl32(pb, 28);                  /* ds64 chunk size */
469             avio_wl64(pb, file_size - 8);       /* RF64 chunk size */
470             avio_wl64(pb, data_size);           /* data chunk size */
471             avio_wl64(pb, number_of_samples);   /* fact chunk number of samples */
472             avio_wl32(pb, 0);                   /* number of table entries for non-'data' chunks */
473
474             /* write -1 in data chunk size */
475             avio_seek(pb, wav->data - 4, SEEK_SET);
476             avio_wl32(pb, -1);
477
478             avio_seek(pb, file_size, SEEK_SET);
479             avio_flush(pb);
480         }
481     }
482
483     if (wav->write_peak)
484         peak_free_buffers(s);
485
486     return 0;
487 }
488
489 #define OFFSET(x) offsetof(WAVMuxContext, x)
490 #define ENC AV_OPT_FLAG_ENCODING_PARAM
491 static const AVOption options[] = {
492     { "write_bext", "Write BEXT chunk.", OFFSET(write_bext), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, ENC },
493     { "write_peak", "Write Peak Envelope chunk.",            OFFSET(write_peak), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 2, ENC, "peak" },
494     { "off",        "Do not write peak chunk.",              0,                  AV_OPT_TYPE_CONST, { .i64 = PEAK_OFF  }, 0, 0, ENC, "peak" },
495     { "on",         "Append peak chunk after wav data.",     0,                  AV_OPT_TYPE_CONST, { .i64 = PEAK_ON   }, 0, 0, ENC, "peak" },
496     { "only",       "Write only peak chunk, omit wav data.", 0,                  AV_OPT_TYPE_CONST, { .i64 = PEAK_ONLY }, 0, 0, ENC, "peak" },
497     { "rf64",       "Use RF64 header rather than RIFF for large files.",    OFFSET(rf64), AV_OPT_TYPE_INT,   { .i64 = RF64_NEVER  },-1, 1, ENC, "rf64" },
498     { "auto",       "Write RF64 header if file grows large enough.",        0,            AV_OPT_TYPE_CONST, { .i64 = RF64_AUTO   }, 0, 0, ENC, "rf64" },
499     { "always",     "Always write RF64 header regardless of file size.",    0,            AV_OPT_TYPE_CONST, { .i64 = RF64_ALWAYS }, 0, 0, ENC, "rf64" },
500     { "never",      "Never write RF64 header regardless of file size.",     0,            AV_OPT_TYPE_CONST, { .i64 = RF64_NEVER  }, 0, 0, ENC, "rf64" },
501     { "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 },
502     { "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 },
503     { "peak_ppv",        "Number of peak points per peak value (1 or 2).",              OFFSET(peak_ppv), AV_OPT_TYPE_INT, { .i64 = 2 }, 1, 2, ENC },
504     { NULL },
505 };
506
507 static const AVClass wav_muxer_class = {
508     .class_name = "WAV muxer",
509     .item_name  = av_default_item_name,
510     .option     = options,
511     .version    = LIBAVUTIL_VERSION_INT,
512 };
513
514 AVOutputFormat ff_wav_muxer = {
515     .name              = "wav",
516     .long_name         = NULL_IF_CONFIG_SMALL("WAV / WAVE (Waveform Audio)"),
517     .mime_type         = "audio/x-wav",
518     .extensions        = "wav",
519     .priv_data_size    = sizeof(WAVMuxContext),
520     .audio_codec       = AV_CODEC_ID_PCM_S16LE,
521     .video_codec       = AV_CODEC_ID_NONE,
522     .write_header      = wav_write_header,
523     .write_packet      = wav_write_packet,
524     .write_trailer     = wav_write_trailer,
525     .flags             = AVFMT_TS_NONSTRICT,
526     .codec_tag         = (const AVCodecTag* const []){ ff_codec_wav_tags, 0 },
527     .priv_class        = &wav_muxer_class,
528 };
529 #endif /* CONFIG_WAV_MUXER */
530
531 #if CONFIG_W64_MUXER
532 #include "w64.h"
533
534 static void start_guid(AVIOContext *pb, const uint8_t *guid, int64_t *pos)
535 {
536     *pos = avio_tell(pb);
537
538     avio_write(pb, guid, 16);
539     avio_wl64(pb, INT64_MAX);
540 }
541
542 static void end_guid(AVIOContext *pb, int64_t start)
543 {
544     int64_t end, pos = avio_tell(pb);
545
546     end = FFALIGN(pos, 8);
547     ffio_fill(pb, 0, end - pos);
548     avio_seek(pb, start + 16, SEEK_SET);
549     avio_wl64(pb, end - start);
550     avio_seek(pb, end, SEEK_SET);
551 }
552
553 static int w64_write_header(AVFormatContext *s)
554 {
555     WAVMuxContext *wav = s->priv_data;
556     AVIOContext *pb = s->pb;
557     int64_t start;
558     int ret;
559
560     avio_write(pb, ff_w64_guid_riff, sizeof(ff_w64_guid_riff));
561     avio_wl64(pb, -1);
562     avio_write(pb, ff_w64_guid_wave, sizeof(ff_w64_guid_wave));
563     start_guid(pb, ff_w64_guid_fmt, &start);
564     if ((ret = ff_put_wav_header(pb, s->streams[0]->codec, 0)) < 0) {
565         av_log(s, AV_LOG_ERROR, "%s codec not supported\n",
566                s->streams[0]->codec->codec ? s->streams[0]->codec->codec->name : "NONE");
567         return ret;
568     }
569     end_guid(pb, start);
570
571     if (s->streams[0]->codec->codec_tag != 0x01 /* hence for all other than PCM */
572         && s->pb->seekable) {
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) {
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]->codec->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]->codec->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         avio_flush(pb);
608     }
609
610     return 0;
611 }
612
613 AVOutputFormat ff_w64_muxer = {
614     .name              = "w64",
615     .long_name         = NULL_IF_CONFIG_SMALL("Sony Wave64"),
616     .extensions        = "w64",
617     .priv_data_size    = sizeof(WAVMuxContext),
618     .audio_codec       = AV_CODEC_ID_PCM_S16LE,
619     .video_codec       = AV_CODEC_ID_NONE,
620     .write_header      = w64_write_header,
621     .write_packet      = wav_write_packet,
622     .write_trailer     = w64_write_trailer,
623     .flags             = AVFMT_TS_NONSTRICT,
624     .codec_tag         = (const AVCodecTag* const []){ ff_codec_wav_tags, 0 },
625 };
626 #endif /* CONFIG_W64_MUXER */