2 * WAV encoder and decoder
3 * Copyright (c) 2001, 2002 Fabrice Bellard.
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 #include "allformats.h"
29 static int wav_write_header(AVFormatContext *s)
31 WAVContext *wav = s->priv_data;
32 ByteIOContext *pb = &s->pb;
36 put_le32(pb, 0); /* file length */
40 fmt = start_tag(pb, "fmt ");
41 if (put_wav_header(pb, s->streams[0]->codec) < 0) {
47 av_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codec->sample_rate);
50 wav->data = start_tag(pb, "data");
57 static int wav_write_packet(AVFormatContext *s, AVPacket *pkt)
59 ByteIOContext *pb = &s->pb;
60 put_buffer(pb, pkt->data, pkt->size);
64 static int wav_write_trailer(AVFormatContext *s)
66 ByteIOContext *pb = &s->pb;
67 WAVContext *wav = s->priv_data;
70 if (!url_is_streamed(&s->pb)) {
71 end_tag(pb, wav->data);
73 /* update file size */
74 file_size = url_ftell(pb);
75 url_fseek(pb, 4, SEEK_SET);
76 put_le32(pb, (uint32_t)(file_size - 8));
77 url_fseek(pb, file_size, SEEK_SET);
83 #endif //CONFIG_MUXERS
85 /* return the size of the found tag */
87 static int find_tag(ByteIOContext *pb, uint32_t tag1)
99 url_fseek(pb, size, SEEK_CUR);
106 static int wav_probe(AVProbeData *p)
108 /* check file header */
109 if (p->buf_size <= 32)
111 if (p->buf[0] == 'R' && p->buf[1] == 'I' &&
112 p->buf[2] == 'F' && p->buf[3] == 'F' &&
113 p->buf[8] == 'W' && p->buf[9] == 'A' &&
114 p->buf[10] == 'V' && p->buf[11] == 'E')
115 return AVPROBE_SCORE_MAX;
121 static int wav_read_header(AVFormatContext *s,
122 AVFormatParameters *ap)
126 ByteIOContext *pb = &s->pb;
128 WAVContext *wav = s->priv_data;
130 /* check RIFF header */
133 if (tag != MKTAG('R', 'I', 'F', 'F'))
135 get_le32(pb); /* file size */
137 if (tag != MKTAG('W', 'A', 'V', 'E'))
140 /* parse fmt header */
141 size = find_tag(pb, MKTAG('f', 'm', 't', ' '));
144 st = av_new_stream(s, 0);
146 return AVERROR_NOMEM;
148 get_wav_header(pb, st->codec, size);
149 st->need_parsing = 1;
151 av_set_pts_info(st, 64, 1, st->codec->sample_rate);
153 size = find_tag(pb, MKTAG('d', 'a', 't', 'a'));
156 wav->data_end= url_ftell(pb) + size;
160 #define MAX_SIZE 4096
162 static int wav_read_packet(AVFormatContext *s,
167 WAVContext *wav = s->priv_data;
169 if (url_feof(&s->pb))
173 left= wav->data_end - url_ftell(&s->pb);
175 left = find_tag(&(s->pb), MKTAG('d', 'a', 't', 'a'));
179 wav->data_end= url_ftell(&s->pb) + left;
183 if (st->codec->block_align > 1) {
184 if (size < st->codec->block_align)
185 size = st->codec->block_align;
186 size = (size / st->codec->block_align) * st->codec->block_align;
188 size= FFMIN(size, left);
189 if (av_new_packet(pkt, size))
191 pkt->stream_index = 0;
193 ret = get_buffer(&s->pb, pkt->data, pkt->size);
196 /* note: we need to modify the packet size here to handle the last
202 static int wav_read_close(AVFormatContext *s)
207 static int wav_read_seek(AVFormatContext *s,
208 int stream_index, int64_t timestamp, int flags)
213 switch(st->codec->codec_id) {
218 /* use generic seeking with dynamically generated indexes */
223 return pcm_read_seek(s, stream_index, timestamp, flags);
226 #ifdef CONFIG_WAV_DEMUXER
227 AVInputFormat wav_demuxer = {
238 #ifdef CONFIG_WAV_MUXER
239 AVOutputFormat wav_muxer = {