2 * WAV muxer and demuxer
3 * Copyright (c) 2001, 2002 Fabrice Bellard.
5 * This file is part of FFmpeg.
7 * FFmpeg 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 * FFmpeg 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 FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
34 static int wav_write_header(AVFormatContext *s)
36 WAVContext *wav = s->priv_data;
37 ByteIOContext *pb = s->pb;
41 put_le32(pb, 0); /* file length */
45 fmt = start_tag(pb, "fmt ");
46 if (put_wav_header(pb, s->streams[0]->codec) < 0) {
52 if(s->streams[0]->codec->codec_tag != 0x01 /* hence for all other than PCM */
53 && !url_is_streamed(s->pb)) {
54 fact = start_tag(pb, "fact");
59 av_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codec->sample_rate);
60 wav->maxpts = wav->last_duration = 0;
61 wav->minpts = INT64_MAX;
64 wav->data = start_tag(pb, "data");
71 static int wav_write_packet(AVFormatContext *s, AVPacket *pkt)
73 ByteIOContext *pb = s->pb;
74 WAVContext *wav = s->priv_data;
75 put_buffer(pb, pkt->data, pkt->size);
76 if(pkt->pts != AV_NOPTS_VALUE) {
77 wav->minpts = FFMIN(wav->minpts, pkt->pts);
78 wav->maxpts = FFMAX(wav->maxpts, pkt->pts);
79 wav->last_duration = pkt->duration;
81 av_log(s, AV_LOG_ERROR, "wav_write_packet: NOPTS\n");
85 static int wav_write_trailer(AVFormatContext *s)
87 ByteIOContext *pb = s->pb;
88 WAVContext *wav = s->priv_data;
91 if (!url_is_streamed(s->pb)) {
92 end_tag(pb, wav->data);
94 /* update file size */
95 file_size = url_ftell(pb);
96 url_fseek(pb, 4, SEEK_SET);
97 put_le32(pb, (uint32_t)(file_size - 8));
98 url_fseek(pb, file_size, SEEK_SET);
100 put_flush_packet(pb);
102 if(s->streams[0]->codec->codec_tag != 0x01) {
103 /* Update num_samps in fact chunk */
104 int number_of_samples;
105 number_of_samples = av_rescale(wav->maxpts - wav->minpts + wav->last_duration,
106 s->streams[0]->codec->sample_rate * (int64_t)s->streams[0]->time_base.num,
107 s->streams[0]->time_base.den);
108 url_fseek(pb, wav->data-12, SEEK_SET);
109 put_le32(pb, number_of_samples);
110 url_fseek(pb, file_size, SEEK_SET);
111 put_flush_packet(pb);
116 #endif //CONFIG_MUXERS
118 /* return the size of the found tag */
120 static int find_tag(ByteIOContext *pb, uint32_t tag1)
132 url_fseek(pb, size, SEEK_CUR);
139 static int wav_probe(AVProbeData *p)
141 /* check file header */
142 if (p->buf_size <= 32)
144 if (p->buf[0] == 'R' && p->buf[1] == 'I' &&
145 p->buf[2] == 'F' && p->buf[3] == 'F' &&
146 p->buf[8] == 'W' && p->buf[9] == 'A' &&
147 p->buf[10] == 'V' && p->buf[11] == 'E')
148 return AVPROBE_SCORE_MAX;
154 static int wav_read_header(AVFormatContext *s,
155 AVFormatParameters *ap)
159 ByteIOContext *pb = s->pb;
161 WAVContext *wav = s->priv_data;
163 /* check RIFF header */
166 if (tag != MKTAG('R', 'I', 'F', 'F'))
168 get_le32(pb); /* file size */
170 if (tag != MKTAG('W', 'A', 'V', 'E'))
173 /* parse fmt header */
174 size = find_tag(pb, MKTAG('f', 'm', 't', ' '));
177 st = av_new_stream(s, 0);
179 return AVERROR(ENOMEM);
181 get_wav_header(pb, st->codec, size);
182 st->need_parsing = AVSTREAM_PARSE_FULL;
184 av_set_pts_info(st, 64, 1, st->codec->sample_rate);
186 size = find_tag(pb, MKTAG('d', 'a', 't', 'a'));
189 wav->data_end= url_ftell(pb) + size;
193 #define MAX_SIZE 4096
195 static int wav_read_packet(AVFormatContext *s,
200 WAVContext *wav = s->priv_data;
206 left= wav->data_end - url_ftell(s->pb);
208 left = find_tag(s->pb, MKTAG('d', 'a', 't', 'a'));
212 wav->data_end= url_ftell(s->pb) + left;
216 if (st->codec->block_align > 1) {
217 if (size < st->codec->block_align)
218 size = st->codec->block_align;
219 size = (size / st->codec->block_align) * st->codec->block_align;
221 size= FFMIN(size, left);
222 ret= av_get_packet(s->pb, pkt, size);
225 pkt->stream_index = 0;
227 /* note: we need to modify the packet size here to handle the last
233 static int wav_read_close(AVFormatContext *s)
238 static int wav_read_seek(AVFormatContext *s,
239 int stream_index, int64_t timestamp, int flags)
244 switch(st->codec->codec_id) {
249 /* use generic seeking with dynamically generated indexes */
254 return pcm_read_seek(s, stream_index, timestamp, flags);
257 #ifdef CONFIG_WAV_DEMUXER
258 AVInputFormat wav_demuxer = {
267 .flags= AVFMT_GENERIC_INDEX,
268 .codec_tag= (const AVCodecTag*[]){codec_wav_tags, 0},
271 #ifdef CONFIG_WAV_MUXER
272 AVOutputFormat wav_muxer = {
283 .codec_tag= (const AVCodecTag*[]){codec_wav_tags, 0},