3 * Copyright (c) 2001, 2002 Fabrice Bellard
5 * This file is part of Libav.
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.
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.
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
25 #include "libavutil/dict.h"
26 #include "libavutil/common.h"
27 #include "libavutil/mathematics.h"
28 #include "libavutil/opt.h"
32 #include "avio_internal.h"
36 typedef struct WAVMuxContext {
46 static inline void bwf_write_bext_string(AVFormatContext *s, const char *key, int maxlen)
48 AVDictionaryEntry *tag;
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);
57 ffio_fill(s->pb, 0, maxlen - len);
60 static void bwf_write_bext_chunk(AVFormatContext *s)
62 AVDictionaryEntry *tmp_tag;
63 uint64_t time_reference = 0;
64 int64_t bext = ff_start_tag(s->pb, "bext");
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);
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
77 if (tmp_tag = av_dict_get(s->metadata, "umid", NULL, 0)) {
78 unsigned char umidpart_str[17] = {0};
81 int len = strlen(tmp_tag->value+2);
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);
88 ffio_fill(s->pb, 0, 64 - i*8);
90 ffio_fill(s->pb, 0, 64); // zero UMID
92 ffio_fill(s->pb, 0, 190); // Reserved
94 if (tmp_tag = av_dict_get(s->metadata, "coding_history", NULL, 0))
95 avio_put_str(s->pb, tmp_tag->value);
97 ff_end_tag(s->pb, bext);
100 static int wav_write_header(AVFormatContext *s)
102 WAVMuxContext *wav = s->priv_data;
103 AVIOContext *pb = s->pb;
106 ffio_wfourcc(pb, "RIFF");
107 avio_wl32(pb, 0); /* file length */
108 ffio_wfourcc(pb, "WAVE");
111 fmt = ff_start_tag(pb, "fmt ");
112 if (ff_put_wav_header(pb, s->streams[0]->codec) < 0) {
113 const AVCodecDescriptor *desc = avcodec_descriptor_get(s->streams[0]->codec->codec_id);
114 av_log(s, AV_LOG_ERROR, "%s codec not supported in WAVE format\n",
115 desc ? desc->name : "unknown");
116 return AVERROR(ENOSYS);
120 if (s->streams[0]->codec->codec_tag != 0x01 /* hence for all other than PCM */
121 && s->pb->seekable) {
122 wav->fact_pos = ff_start_tag(pb, "fact");
124 ff_end_tag(pb, wav->fact_pos);
128 bwf_write_bext_chunk(s);
130 avpriv_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codec->sample_rate);
131 wav->maxpts = wav->last_duration = 0;
132 wav->minpts = INT64_MAX;
135 ff_riff_write_info(s);
138 wav->data = ff_start_tag(pb, "data");
145 static int wav_write_packet(AVFormatContext *s, AVPacket *pkt)
147 AVIOContext *pb = s->pb;
148 WAVMuxContext *wav = s->priv_data;
149 avio_write(pb, pkt->data, pkt->size);
150 if(pkt->pts != AV_NOPTS_VALUE) {
151 wav->minpts = FFMIN(wav->minpts, pkt->pts);
152 wav->maxpts = FFMAX(wav->maxpts, pkt->pts);
153 wav->last_duration = pkt->duration;
155 av_log(s, AV_LOG_ERROR, "wav_write_packet: NOPTS\n");
159 static int wav_write_trailer(AVFormatContext *s)
161 AVIOContext *pb = s->pb;
162 WAVMuxContext *wav = s->priv_data;
167 if (s->pb->seekable) {
168 ff_end_tag(pb, wav->data);
170 /* update file size */
171 file_size = avio_tell(pb);
172 avio_seek(pb, 4, SEEK_SET);
173 avio_wl32(pb, (uint32_t)(file_size - 8));
174 avio_seek(pb, file_size, SEEK_SET);
178 if(s->streams[0]->codec->codec_tag != 0x01) {
179 /* Update num_samps in fact chunk */
180 int number_of_samples;
181 number_of_samples = av_rescale(wav->maxpts - wav->minpts + wav->last_duration,
182 s->streams[0]->codec->sample_rate * (int64_t)s->streams[0]->time_base.num,
183 s->streams[0]->time_base.den);
184 avio_seek(pb, wav->fact_pos, SEEK_SET);
185 avio_wl32(pb, number_of_samples);
186 avio_seek(pb, file_size, SEEK_SET);
193 #define OFFSET(x) offsetof(WAVMuxContext, x)
194 #define ENC AV_OPT_FLAG_ENCODING_PARAM
195 static const AVOption options[] = {
196 { "write_bext", "Write BEXT chunk.", OFFSET(write_bext), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, ENC },
200 static const AVClass wav_muxer_class = {
201 .class_name = "WAV muxer",
202 .item_name = av_default_item_name,
204 .version = LIBAVUTIL_VERSION_INT,
207 AVOutputFormat ff_wav_muxer = {
209 .long_name = NULL_IF_CONFIG_SMALL("WAV / WAVE (Waveform Audio)"),
210 .mime_type = "audio/x-wav",
212 .priv_data_size = sizeof(WAVMuxContext),
213 .audio_codec = AV_CODEC_ID_PCM_S16LE,
214 .video_codec = AV_CODEC_ID_NONE,
215 .write_header = wav_write_header,
216 .write_packet = wav_write_packet,
217 .write_trailer = wav_write_trailer,
218 .flags = AVFMT_TS_NONSTRICT,
219 .codec_tag = (const AVCodecTag* const []){ ff_codec_wav_tags, 0 },
220 .priv_class = &wav_muxer_class,