2 * AU encoder and decoder
3 * Copyright (c) 2001 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 * First version by Francois Revol revol@free.fr
23 * Reference documents:
24 * http://www.opengroup.org/public/pubs/external/auformat.html
25 * http://www.goice.co.jp/member/mo/formats/au.html
31 /* if we don't know the size in advance */
32 #define AU_UNKOWN_SIZE ((uint32_t)(~0))
34 /* The ffmpeg codecs we support, and the IDs they have in the file */
35 static const CodecTag codec_au_tags[] = {
36 { CODEC_ID_PCM_MULAW, 1 },
37 { CODEC_ID_PCM_S16BE, 3 },
38 { CODEC_ID_PCM_ALAW, 27 },
42 #ifdef CONFIG_ENCODERS
43 /* AUDIO_FILE header */
44 static int put_au_header(ByteIOContext *pb, AVCodecContext *enc)
47 enc->codec_tag = codec_get_tag(codec_au_tags, enc->codec_id);
50 put_tag(pb, ".snd"); /* magic number */
51 put_be32(pb, 24); /* header size */
52 put_be32(pb, AU_UNKOWN_SIZE); /* data size */
53 put_be32(pb, (uint32_t)enc->codec_tag); /* codec ID */
54 put_be32(pb, enc->sample_rate);
55 put_be32(pb, (uint32_t)enc->channels);
59 static int au_write_header(AVFormatContext *s)
61 ByteIOContext *pb = &s->pb;
66 if (put_au_header(pb, &s->streams[0]->codec) < 0) {
75 static int au_write_packet(AVFormatContext *s, AVPacket *pkt)
77 ByteIOContext *pb = &s->pb;
78 put_buffer(pb, pkt->data, pkt->size);
82 static int au_write_trailer(AVFormatContext *s)
84 ByteIOContext *pb = &s->pb;
87 if (!url_is_streamed(&s->pb)) {
89 /* update file size */
90 file_size = url_ftell(pb);
91 url_fseek(pb, 8, SEEK_SET);
92 put_be32(pb, (uint32_t)(file_size - 24));
93 url_fseek(pb, file_size, SEEK_SET);
100 #endif //CONFIG_ENCODERS
102 static int au_probe(AVProbeData *p)
104 /* check file header */
105 if (p->buf_size <= 24)
107 if (p->buf[0] == '.' && p->buf[1] == 's' &&
108 p->buf[2] == 'n' && p->buf[3] == 'd')
109 return AVPROBE_SCORE_MAX;
115 static int au_read_header(AVFormatContext *s,
116 AVFormatParameters *ap)
120 ByteIOContext *pb = &s->pb;
121 unsigned int id, codec, channels, rate;
124 /* check ".snd" header */
126 if (tag != MKTAG('.', 's', 'n', 'd'))
128 size = get_be32(pb); /* header size */
129 get_be32(pb); /* data size */
133 channels = get_be32(pb);
135 codec = codec_get_id(codec_au_tags, id);
138 /* skip unused data */
139 url_fseek(pb, size - 24, SEEK_CUR);
142 /* now we are ready: build format streams */
143 st = av_new_stream(s, 0);
146 st->codec.codec_type = CODEC_TYPE_AUDIO;
147 st->codec.codec_tag = id;
148 st->codec.codec_id = codec;
149 st->codec.channels = channels;
150 st->codec.sample_rate = rate;
154 #define MAX_SIZE 4096
156 static int au_read_packet(AVFormatContext *s,
161 if (url_feof(&s->pb))
163 if (av_new_packet(pkt, MAX_SIZE))
165 pkt->stream_index = 0;
167 ret = get_buffer(&s->pb, pkt->data, pkt->size);
170 /* note: we need to modify the packet size here to handle the last
176 static int au_read_close(AVFormatContext *s)
181 static AVInputFormat au_iformat = {
192 #ifdef CONFIG_ENCODERS
193 static AVOutputFormat au_oformat = {
205 #endif //CONFIG_ENCODERS
209 av_register_input_format(&au_iformat);
210 #ifdef CONFIG_ENCODERS
211 av_register_output_format(&au_oformat);
212 #endif //CONFIG_ENCODERS