wavenc.c
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1 /*
2  * WAV muxer
3  * Copyright (c) 2001, 2002 Fabrice Bellard
4  *
5  * This file is part of Libav.
6  *
7  * Libav is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * Libav is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with Libav; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include <stdint.h>
23 #include <string.h>
24 
25 #include "libavutil/dict.h"
26 #include "libavutil/common.h"
27 #include "libavutil/mathematics.h"
28 #include "libavutil/opt.h"
29 
30 #include "avformat.h"
31 #include "avio.h"
32 #include "avio_internal.h"
33 #include "internal.h"
34 #include "riff.h"
35 
36 typedef struct WAVMuxContext {
37  const AVClass *class;
38  int64_t data;
39  int64_t fact_pos;
40  int64_t minpts;
41  int64_t maxpts;
45 
46 static inline void bwf_write_bext_string(AVFormatContext *s, const char *key, int maxlen)
47 {
49  int len = 0;
50 
51  if (tag = av_dict_get(s->metadata, key, NULL, 0)) {
52  len = strlen(tag->value);
53  len = FFMIN(len, maxlen);
54  avio_write(s->pb, tag->value, len);
55  }
56 
57  ffio_fill(s->pb, 0, maxlen - len);
58 }
59 
61 {
62  AVDictionaryEntry *tmp_tag;
63  uint64_t time_reference = 0;
64  int64_t bext = ff_start_tag(s->pb, "bext");
65 
66  bwf_write_bext_string(s, "description", 256);
67  bwf_write_bext_string(s, "originator", 32);
68  bwf_write_bext_string(s, "originator_reference", 32);
69  bwf_write_bext_string(s, "origination_date", 10);
70  bwf_write_bext_string(s, "origination_time", 8);
71 
72  if (tmp_tag = av_dict_get(s->metadata, "time_reference", NULL, 0))
73  time_reference = strtoll(tmp_tag->value, NULL, 10);
74  avio_wl64(s->pb, time_reference);
75  avio_wl16(s->pb, 1); // set version to 1
76 
77  if (tmp_tag = av_dict_get(s->metadata, "umid", NULL, 0)) {
78  unsigned char umidpart_str[17] = {0};
79  int i;
80  uint64_t umidpart;
81  int len = strlen(tmp_tag->value+2);
82 
83  for (i = 0; i < len/16; i++) {
84  memcpy(umidpart_str, tmp_tag->value + 2 + (i*16), 16);
85  umidpart = strtoll(umidpart_str, NULL, 16);
86  avio_wb64(s->pb, umidpart);
87  }
88  ffio_fill(s->pb, 0, 64 - i*8);
89  } else
90  ffio_fill(s->pb, 0, 64); // zero UMID
91 
92  ffio_fill(s->pb, 0, 190); // Reserved
93 
94  if (tmp_tag = av_dict_get(s->metadata, "coding_history", NULL, 0))
95  avio_put_str(s->pb, tmp_tag->value);
96 
97  ff_end_tag(s->pb, bext);
98 }
99 
101 {
102  WAVMuxContext *wav = s->priv_data;
103  AVIOContext *pb = s->pb;
104  int64_t fmt;
105 
106  ffio_wfourcc(pb, "RIFF");
107  avio_wl32(pb, 0); /* file length */
108  ffio_wfourcc(pb, "WAVE");
109 
110  /* format header */
111  fmt = ff_start_tag(pb, "fmt ");
112  if (ff_put_wav_header(pb, s->streams[0]->codec) < 0) {
113  av_log(s, AV_LOG_ERROR, "%s codec not supported in WAVE format\n",
114  s->streams[0]->codec->codec ? s->streams[0]->codec->codec->name : "NONE");
115  return -1;
116  }
117  ff_end_tag(pb, fmt);
118 
119  if (s->streams[0]->codec->codec_tag != 0x01 /* hence for all other than PCM */
120  && s->pb->seekable) {
121  wav->fact_pos = ff_start_tag(pb, "fact");
122  avio_wl32(pb, 0);
123  ff_end_tag(pb, wav->fact_pos);
124  }
125 
126  if (wav->write_bext)
128 
129  avpriv_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codec->sample_rate);
130  wav->maxpts = wav->last_duration = 0;
131  wav->minpts = INT64_MAX;
132 
133  /* info header */
135 
136  /* data header */
137  wav->data = ff_start_tag(pb, "data");
138 
139  avio_flush(pb);
140 
141  return 0;
142 }
143 
145 {
146  AVIOContext *pb = s->pb;
147  WAVMuxContext *wav = s->priv_data;
148  avio_write(pb, pkt->data, pkt->size);
149  if(pkt->pts != AV_NOPTS_VALUE) {
150  wav->minpts = FFMIN(wav->minpts, pkt->pts);
151  wav->maxpts = FFMAX(wav->maxpts, pkt->pts);
152  wav->last_duration = pkt->duration;
153  } else
154  av_log(s, AV_LOG_ERROR, "wav_write_packet: NOPTS\n");
155  return 0;
156 }
157 
159 {
160  AVIOContext *pb = s->pb;
161  WAVMuxContext *wav = s->priv_data;
162  int64_t file_size;
163 
164  avio_flush(pb);
165 
166  if (s->pb->seekable) {
167  ff_end_tag(pb, wav->data);
168 
169  /* update file size */
170  file_size = avio_tell(pb);
171  avio_seek(pb, 4, SEEK_SET);
172  avio_wl32(pb, (uint32_t)(file_size - 8));
173  avio_seek(pb, file_size, SEEK_SET);
174 
175  avio_flush(pb);
176 
177  if(s->streams[0]->codec->codec_tag != 0x01) {
178  /* Update num_samps in fact chunk */
179  int number_of_samples;
180  number_of_samples = av_rescale(wav->maxpts - wav->minpts + wav->last_duration,
181  s->streams[0]->codec->sample_rate * (int64_t)s->streams[0]->time_base.num,
182  s->streams[0]->time_base.den);
183  avio_seek(pb, wav->fact_pos, SEEK_SET);
184  avio_wl32(pb, number_of_samples);
185  avio_seek(pb, file_size, SEEK_SET);
186  avio_flush(pb);
187  }
188  }
189  return 0;
190 }
191 
192 #define OFFSET(x) offsetof(WAVMuxContext, x)
193 #define ENC AV_OPT_FLAG_ENCODING_PARAM
194 static const AVOption options[] = {
195  { "write_bext", "Write BEXT chunk.", OFFSET(write_bext), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, ENC },
196  { NULL },
197 };
198 
199 static const AVClass wav_muxer_class = {
200  .class_name = "WAV muxer",
201  .item_name = av_default_item_name,
202  .option = options,
203  .version = LIBAVUTIL_VERSION_INT,
204 };
205 
207  .name = "wav",
208  .long_name = NULL_IF_CONFIG_SMALL("WAV / WAVE (Waveform Audio)"),
209  .mime_type = "audio/x-wav",
210  .extensions = "wav",
211  .priv_data_size = sizeof(WAVMuxContext),
212  .audio_codec = AV_CODEC_ID_PCM_S16LE,
213  .video_codec = AV_CODEC_ID_NONE,
218  .codec_tag = (const AVCodecTag* const []){ ff_codec_wav_tags, 0 },
219  .priv_class = &wav_muxer_class,
220 };