3 * Copyright (c) 2001 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
23 * First version by Francois Revol revol@free.fr
25 * Reference documents:
26 * http://www.opengroup.org/public/pubs/external/auformat.html
27 * http://www.goice.co.jp/member/mo/formats/au.html
31 #include "allformats.h"
34 /* if we don't know the size in advance */
35 #define AU_UNKNOWN_SIZE ((uint32_t)(~0))
37 /* The ffmpeg codecs we support, and the IDs they have in the file */
38 static const AVCodecTag codec_au_tags[] = {
39 { CODEC_ID_PCM_MULAW, 1 },
40 { CODEC_ID_PCM_S16BE, 3 },
41 { CODEC_ID_PCM_ALAW, 27 },
46 /* AUDIO_FILE header */
47 static int put_au_header(ByteIOContext *pb, AVCodecContext *enc)
51 put_tag(pb, ".snd"); /* magic number */
52 put_be32(pb, 24); /* header size */
53 put_be32(pb, AU_UNKNOWN_SIZE); /* data size */
54 put_be32(pb, (uint32_t)enc->codec_tag); /* codec ID */
55 put_be32(pb, enc->sample_rate);
56 put_be32(pb, (uint32_t)enc->channels);
60 static int au_write_header(AVFormatContext *s)
62 ByteIOContext *pb = &s->pb;
67 if (put_au_header(pb, s->streams[0]->codec) < 0) {
76 static int au_write_packet(AVFormatContext *s, AVPacket *pkt)
78 ByteIOContext *pb = &s->pb;
79 put_buffer(pb, pkt->data, pkt->size);
83 static int au_write_trailer(AVFormatContext *s)
85 ByteIOContext *pb = &s->pb;
88 if (!url_is_streamed(&s->pb)) {
90 /* update file size */
91 file_size = url_ftell(pb);
92 url_fseek(pb, 8, SEEK_SET);
93 put_be32(pb, (uint32_t)(file_size - 24));
94 url_fseek(pb, file_size, SEEK_SET);
101 #endif //CONFIG_MUXERS
103 static int au_probe(AVProbeData *p)
105 /* check file header */
106 if (p->buf[0] == '.' && p->buf[1] == 's' &&
107 p->buf[2] == 'n' && p->buf[3] == 'd')
108 return AVPROBE_SCORE_MAX;
114 static int au_read_header(AVFormatContext *s,
115 AVFormatParameters *ap)
119 ByteIOContext *pb = &s->pb;
120 unsigned int id, codec, channels, rate;
123 /* check ".snd" header */
125 if (tag != MKTAG('.', 's', 'n', 'd'))
127 size = get_be32(pb); /* header size */
128 get_be32(pb); /* data size */
132 channels = get_be32(pb);
134 codec = codec_get_id(codec_au_tags, id);
137 /* skip unused data */
138 url_fseek(pb, size - 24, SEEK_CUR);
141 /* now we are ready: build format streams */
142 st = av_new_stream(s, 0);
145 st->codec->codec_type = CODEC_TYPE_AUDIO;
146 st->codec->codec_tag = id;
147 st->codec->codec_id = codec;
148 st->codec->channels = channels;
149 st->codec->sample_rate = rate;
150 av_set_pts_info(st, 64, 1, rate);
154 #define MAX_SIZE 4096
156 static int au_read_packet(AVFormatContext *s,
161 if (url_feof(&s->pb))
163 ret= av_get_packet(&s->pb, pkt, MAX_SIZE);
166 pkt->stream_index = 0;
168 /* note: we need to modify the packet size here to handle the last
174 static int au_read_close(AVFormatContext *s)
179 #ifdef CONFIG_AU_DEMUXER
180 AVInputFormat au_demuxer = {
189 .codec_tag= (const AVCodecTag*[]){codec_au_tags, 0},
193 #ifdef CONFIG_AU_MUXER
194 AVOutputFormat au_muxer = {
205 .codec_tag= (const AVCodecTag*[]){codec_au_tags, 0},
207 #endif //CONFIG_AU_MUXER