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wavenc.c
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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  * This file is part of FFmpeg.
12  *
13  * FFmpeg is free software; you can redistribute it and/or
14  * modify it under the terms of the GNU Lesser General Public
15  * License as published by the Free Software Foundation; either
16  * version 2.1 of the License, or (at your option) any later version.
17  *
18  * FFmpeg is distributed in the hope that it will be useful,
19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
21  * Lesser General Public License for more details.
22  *
23  * You should have received a copy of the GNU Lesser General Public
24  * License along with FFmpeg; if not, write to the Free Software
25  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
26  */
27 
28 #include <stdint.h>
29 #include <string.h>
30 
31 #include "libavutil/dict.h"
32 #include "libavutil/common.h"
33 #include "libavutil/mathematics.h"
34 #include "libavutil/opt.h"
35 
36 #include "avformat.h"
37 #include "avio.h"
38 #include "avio_internal.h"
39 #include "internal.h"
40 #include "riff.h"
41 
42 #define RF64_AUTO (-1)
43 #define RF64_NEVER 0
44 #define RF64_ALWAYS 1
45 
46 typedef struct WAVMuxContext {
47  const AVClass *class;
48  int64_t data;
49  int64_t fact_pos;
50  int64_t ds64;
51  int64_t minpts;
52  int64_t maxpts;
55  int rf64;
57 
58 #if CONFIG_WAV_MUXER
59 static inline void bwf_write_bext_string(AVFormatContext *s, const char *key, int maxlen)
60 {
62  int len = 0;
63 
64  if (tag = av_dict_get(s->metadata, key, NULL, 0)) {
65  len = strlen(tag->value);
66  len = FFMIN(len, maxlen);
67  avio_write(s->pb, tag->value, len);
68  }
69 
70  ffio_fill(s->pb, 0, maxlen - len);
71 }
72 
73 static void bwf_write_bext_chunk(AVFormatContext *s)
74 {
75  AVDictionaryEntry *tmp_tag;
76  uint64_t time_reference = 0;
77  int64_t bext = ff_start_tag(s->pb, "bext");
78 
79  bwf_write_bext_string(s, "description", 256);
80  bwf_write_bext_string(s, "originator", 32);
81  bwf_write_bext_string(s, "originator_reference", 32);
82  bwf_write_bext_string(s, "origination_date", 10);
83  bwf_write_bext_string(s, "origination_time", 8);
84 
85  if (tmp_tag = av_dict_get(s->metadata, "time_reference", NULL, 0))
86  time_reference = strtoll(tmp_tag->value, NULL, 10);
87  avio_wl64(s->pb, time_reference);
88  avio_wl16(s->pb, 1); // set version to 1
89 
90  if (tmp_tag = av_dict_get(s->metadata, "umid", NULL, 0)) {
91  unsigned char umidpart_str[17] = {0};
92  int i;
93  uint64_t umidpart;
94  int len = strlen(tmp_tag->value+2);
95 
96  for (i = 0; i < len/16; i++) {
97  memcpy(umidpart_str, tmp_tag->value + 2 + (i*16), 16);
98  umidpart = strtoll(umidpart_str, NULL, 16);
99  avio_wb64(s->pb, umidpart);
100  }
101  ffio_fill(s->pb, 0, 64 - i*8);
102  } else
103  ffio_fill(s->pb, 0, 64); // zero UMID
104 
105  ffio_fill(s->pb, 0, 190); // Reserved
106 
107  if (tmp_tag = av_dict_get(s->metadata, "coding_history", NULL, 0))
108  avio_put_str(s->pb, tmp_tag->value);
109 
110  ff_end_tag(s->pb, bext);
111 }
112 
113 static int wav_write_header(AVFormatContext *s)
114 {
115  WAVMuxContext *wav = s->priv_data;
116  AVIOContext *pb = s->pb;
117  int64_t fmt;
118 
119  if (wav->rf64 == RF64_ALWAYS) {
120  ffio_wfourcc(pb, "RF64");
121  avio_wl32(pb, -1); /* RF64 chunk size: use size in ds64 */
122  } else {
123  ffio_wfourcc(pb, "RIFF");
124  avio_wl32(pb, 0); /* file length */
125  }
126 
127  ffio_wfourcc(pb, "WAVE");
128 
129  if (wav->rf64 != RF64_NEVER) {
130  /* write empty ds64 chunk or JUNK chunk to reserve space for ds64 */
131  ffio_wfourcc(pb, wav->rf64 == RF64_ALWAYS ? "ds64" : "JUNK");
132  avio_wl32(pb, 28); /* chunk size */
133  wav->ds64 = avio_tell(pb);
134  ffio_fill(pb, 0, 28);
135  }
136 
137  /* format header */
138  fmt = ff_start_tag(pb, "fmt ");
139  if (ff_put_wav_header(pb, s->streams[0]->codec) < 0) {
140  av_log(s, AV_LOG_ERROR, "%s codec not supported in WAVE format\n",
141  s->streams[0]->codec->codec ? s->streams[0]->codec->codec->name : "NONE");
142  return -1;
143  }
144  ff_end_tag(pb, fmt);
145 
146  if (s->streams[0]->codec->codec_tag != 0x01 /* hence for all other than PCM */
147  && s->pb->seekable) {
148  wav->fact_pos = ff_start_tag(pb, "fact");
149  avio_wl32(pb, 0);
150  ff_end_tag(pb, wav->fact_pos);
151  }
152 
153  if (wav->write_bext)
154  bwf_write_bext_chunk(s);
155 
156  avpriv_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codec->sample_rate);
157  wav->maxpts = wav->last_duration = 0;
158  wav->minpts = INT64_MAX;
159 
160  /* info header */
162 
163  /* data header */
164  wav->data = ff_start_tag(pb, "data");
165 
166  avio_flush(pb);
167 
168  return 0;
169 }
170 
171 static int wav_write_packet(AVFormatContext *s, AVPacket *pkt)
172 {
173  AVIOContext *pb = s->pb;
174  WAVMuxContext *wav = s->priv_data;
175  avio_write(pb, pkt->data, pkt->size);
176  if(pkt->pts != AV_NOPTS_VALUE) {
177  wav->minpts = FFMIN(wav->minpts, pkt->pts);
178  wav->maxpts = FFMAX(wav->maxpts, pkt->pts);
179  wav->last_duration = pkt->duration;
180  } else
181  av_log(s, AV_LOG_ERROR, "wav_write_packet: NOPTS\n");
182  return 0;
183 }
184 
185 static int wav_write_trailer(AVFormatContext *s)
186 {
187  AVIOContext *pb = s->pb;
188  WAVMuxContext *wav = s->priv_data;
189  int64_t file_size, data_size;
190  int64_t number_of_samples = 0;
191  int rf64 = 0;
192 
193  avio_flush(pb);
194 
195  if (s->pb->seekable) {
196  /* update file size */
197  file_size = avio_tell(pb);
198  data_size = file_size - wav->data;
199  if (wav->rf64 == RF64_ALWAYS || (wav->rf64 == RF64_AUTO && file_size - 8 > UINT32_MAX)) {
200  rf64 = 1;
201  } else {
202  avio_seek(pb, 4, SEEK_SET);
203  avio_wl32(pb, (uint32_t)(file_size - 8));
204  avio_seek(pb, file_size, SEEK_SET);
205 
206  ff_end_tag(pb, wav->data);
207  avio_flush(pb);
208  }
209 
210  number_of_samples = av_rescale(wav->maxpts - wav->minpts + wav->last_duration,
211  s->streams[0]->codec->sample_rate * (int64_t)s->streams[0]->time_base.num,
212  s->streams[0]->time_base.den);
213 
214  if(s->streams[0]->codec->codec_tag != 0x01) {
215  /* Update num_samps in fact chunk */
216  avio_seek(pb, wav->fact_pos, SEEK_SET);
217  if (rf64 || (wav->rf64 == RF64_AUTO && number_of_samples > UINT32_MAX)) {
218  rf64 = 1;
219  avio_wl32(pb, -1);
220  } else {
221  avio_wl32(pb, number_of_samples);
222  avio_seek(pb, file_size, SEEK_SET);
223  avio_flush(pb);
224  }
225  }
226 
227  if (rf64) {
228  /* overwrite RIFF with RF64 */
229  avio_seek(pb, 0, SEEK_SET);
230  ffio_wfourcc(pb, "RF64");
231  avio_wl32(pb, -1);
232 
233  /* write ds64 chunk (overwrite JUNK if rf64 == RF64_AUTO) */
234  avio_seek(pb, wav->ds64 - 8, SEEK_SET);
235  ffio_wfourcc(pb, "ds64");
236  avio_wl32(pb, 28); /* ds64 chunk size */
237  avio_wl64(pb, file_size - 8); /* RF64 chunk size */
238  avio_wl64(pb, data_size); /* data chunk size */
239  avio_wl64(pb, number_of_samples); /* fact chunk number of samples */
240  avio_wl32(pb, 0); /* number of table entries for non-'data' chunks */
241 
242  /* write -1 in data chunk size */
243  avio_seek(pb, wav->data - 4, SEEK_SET);
244  avio_wl32(pb, -1);
245 
246  avio_seek(pb, file_size, SEEK_SET);
247  avio_flush(pb);
248  }
249  }
250  return 0;
251 }
252 
253 #define OFFSET(x) offsetof(WAVMuxContext, x)
254 #define ENC AV_OPT_FLAG_ENCODING_PARAM
255 static const AVOption options[] = {
256  { "write_bext", "Write BEXT chunk.", OFFSET(write_bext), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, ENC },
257  { "rf64", "Use RF64 header rather than RIFF for large files.", OFFSET(rf64), AV_OPT_TYPE_INT, { .i64 = RF64_NEVER },-1, 1, ENC, "rf64" },
258  { "auto", "Write RF64 header if file grows large enough.", 0, AV_OPT_TYPE_CONST, { .i64 = RF64_AUTO }, 0, 0, ENC, "rf64" },
259  { "always", "Always write RF64 header regardless of file size.", 0, AV_OPT_TYPE_CONST, { .i64 = RF64_ALWAYS }, 0, 0, ENC, "rf64" },
260  { "never", "Never write RF64 header regardless of file size.", 0, AV_OPT_TYPE_CONST, { .i64 = RF64_NEVER }, 0, 0, ENC, "rf64" },
261  { NULL },
262 };
263 
264 static const AVClass wav_muxer_class = {
265  .class_name = "WAV muxer",
266  .item_name = av_default_item_name,
267  .option = options,
268  .version = LIBAVUTIL_VERSION_INT,
269 };
270 
271 AVOutputFormat ff_wav_muxer = {
272  .name = "wav",
273  .long_name = NULL_IF_CONFIG_SMALL("WAV / WAVE (Waveform Audio)"),
274  .mime_type = "audio/x-wav",
275  .extensions = "wav",
276  .priv_data_size = sizeof(WAVMuxContext),
277  .audio_codec = AV_CODEC_ID_PCM_S16LE,
278  .video_codec = AV_CODEC_ID_NONE,
279  .write_header = wav_write_header,
280  .write_packet = wav_write_packet,
281  .write_trailer = wav_write_trailer,
283  .codec_tag = (const AVCodecTag* const []){ ff_codec_wav_tags, 0 },
284  .priv_class = &wav_muxer_class,
285 };
286 #endif /* CONFIG_WAV_MUXER */
287 
288 #if CONFIG_W64_MUXER
289 #include "w64.h"
290 
291 static void start_guid(AVIOContext *pb, const uint8_t *guid, int64_t *pos)
292 {
293  *pos = avio_tell(pb);
294 
295  avio_write(pb, guid, 16);
296  avio_wl64(pb, INT64_MAX);
297 }
298 
299 static void end_guid(AVIOContext *pb, int64_t start)
300 {
301  int64_t end, pos = avio_tell(pb);
302 
303  end = FFALIGN(pos, 8);
304  ffio_fill(pb, 0, end - pos);
305  avio_seek(pb, start + 16, SEEK_SET);
306  avio_wl64(pb, end - start);
307  avio_seek(pb, end, SEEK_SET);
308 }
309 
310 static int w64_write_header(AVFormatContext *s)
311 {
312  WAVMuxContext *wav = s->priv_data;
313  AVIOContext *pb = s->pb;
314  int64_t start;
315  int ret;
316 
318  avio_wl64(pb, -1);
320  start_guid(pb, ff_w64_guid_fmt, &start);
321  if ((ret = ff_put_wav_header(pb, s->streams[0]->codec)) < 0) {
322  av_log(s, AV_LOG_ERROR, "%s codec not supported\n",
323  s->streams[0]->codec->codec ? s->streams[0]->codec->codec->name : "NONE");
324  return ret;
325  }
326  end_guid(pb, start);
327 
328  if (s->streams[0]->codec->codec_tag != 0x01 /* hence for all other than PCM */
329  && s->pb->seekable) {
330  start_guid(pb, ff_w64_guid_fact, &wav->fact_pos);
331  avio_wl64(pb, 0);
332  end_guid(pb, wav->fact_pos);
333  }
334 
335  start_guid(pb, ff_w64_guid_data, &wav->data);
336 
337  return 0;
338 }
339 
340 static int w64_write_trailer(AVFormatContext *s)
341 {
342  AVIOContext *pb = s->pb;
343  WAVMuxContext *wav = s->priv_data;
344  int64_t file_size;
345 
346  if (pb->seekable) {
347  end_guid(pb, wav->data);
348 
349  file_size = avio_tell(pb);
350  avio_seek(pb, 16, SEEK_SET);
351  avio_wl64(pb, file_size);
352 
353  if (s->streams[0]->codec->codec_tag != 0x01) {
354  int64_t number_of_samples;
355 
356  number_of_samples = av_rescale(wav->maxpts - wav->minpts + wav->last_duration,
357  s->streams[0]->codec->sample_rate * (int64_t)s->streams[0]->time_base.num,
358  s->streams[0]->time_base.den);
359  avio_seek(pb, wav->fact_pos + 24, SEEK_SET);
360  avio_wl64(pb, number_of_samples);
361  }
362 
363  avio_seek(pb, file_size, SEEK_SET);
364  avio_flush(pb);
365  }
366 
367  return 0;
368 }
369 
370 AVOutputFormat ff_w64_muxer = {
371  .name = "w64",
372  .long_name = NULL_IF_CONFIG_SMALL("Sony Wave64"),
373  .extensions = "w64",
374  .priv_data_size = sizeof(WAVMuxContext),
375  .audio_codec = AV_CODEC_ID_PCM_S16LE,
376  .video_codec = AV_CODEC_ID_NONE,
377  .write_header = w64_write_header,
378  .write_packet = wav_write_packet,
379  .write_trailer = w64_write_trailer,
381  .codec_tag = (const AVCodecTag* const []){ ff_codec_wav_tags, 0 },
382 };
383 #endif /* CONFIG_W64_MUXER */