2 * AU encoder and decoder
3 * Copyright (c) 2001 Gerard Lantau.
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program 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
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, 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)(~0))
34 /* The ffmpeg codecs we support, and the IDs they have in the file */
35 CodecTag codec_au_tags[] = {
36 { CODEC_ID_PCM_MULAW, 1 },
37 { CODEC_ID_PCM_S16BE, 3 },
38 { CODEC_ID_PCM_ALAW, 27 },
42 /* AUDIO_FILE header */
43 int put_au_header(ByteIOContext *pb, AVCodecContext *enc)
47 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)tag); /* codec ID */
54 put_be32(pb, enc->sample_rate);
55 put_be32(pb, (UINT32)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, int stream_index_ptr,
76 UINT8 *buf, int size, int force_pts)
78 ByteIOContext *pb = &s->pb;
79 put_buffer(pb, buf, 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)(file_size - 24));
94 url_fseek(pb, file_size, SEEK_SET);
103 static int au_read_header(AVFormatContext *s,
104 AVFormatParameters *ap)
108 ByteIOContext *pb = &s->pb;
109 unsigned int id, codec, channels, rate;
112 /* check ".snd" header */
114 if (tag != MKTAG('.', 's', 'n', 'd'))
116 size = get_be32(pb); /* header size */
117 get_be32(pb); /* data size */
121 channels = get_be32(pb);
123 codec = codec_get_id(codec_au_tags, id);
126 /* skip unused data */
127 url_fseek(pb, size - 24, SEEK_CUR);
130 /* now we are ready: build format streams */
131 st = malloc(sizeof(AVStream));
139 st->codec.codec_type = CODEC_TYPE_AUDIO;
140 st->codec.codec_tag = id;
141 st->codec.codec_id = codec;
142 st->codec.channels = channels;
143 st->codec.sample_rate = rate;
147 #define MAX_SIZE 4096
149 static int au_read_packet(AVFormatContext *s,
152 int packet_size, n, ret;
154 if (url_feof(&s->pb))
156 packet_size = url_get_packet_size(&s->pb);
157 n = MAX_SIZE / packet_size;
160 if (av_new_packet(pkt, n * packet_size))
162 pkt->stream_index = 0;
164 ret = get_buffer(&s->pb, pkt->data, pkt->size);
167 /* note: we need to modify the packet size here to handle the last
173 static int au_read_close(AVFormatContext *s)
178 AVFormat au_format = {