3 * Copyright (c) 2001 Fabrice Bellard
5 * This file is part of Libav.
7 * Libav 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 * Libav 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 Libav; 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
32 #include "avio_internal.h"
35 /* The libavcodec codecs we support, and the IDs they have in the file */
36 static const AVCodecTag codec_au_tags[] = {
37 { AV_CODEC_ID_PCM_MULAW, 1 },
38 { AV_CODEC_ID_PCM_S8, 2 },
39 { AV_CODEC_ID_PCM_S16BE, 3 },
40 { AV_CODEC_ID_PCM_S24BE, 4 },
41 { AV_CODEC_ID_PCM_S32BE, 5 },
42 { AV_CODEC_ID_PCM_F32BE, 6 },
43 { AV_CODEC_ID_PCM_F64BE, 7 },
44 { AV_CODEC_ID_PCM_ALAW, 27 },
45 { AV_CODEC_ID_NONE, 0 },
50 static int au_probe(AVProbeData *p)
52 /* check file header */
53 if (p->buf[0] == '.' && p->buf[1] == 's' &&
54 p->buf[2] == 'n' && p->buf[3] == 'd')
55 return AVPROBE_SCORE_MAX;
61 static int au_read_header(AVFormatContext *s)
65 AVIOContext *pb = s->pb;
66 unsigned int id, channels, rate;
70 /* check ".snd" header */
72 if (tag != MKTAG('.', 's', 'n', 'd'))
74 size = avio_rb32(pb); /* header size */
75 avio_rb32(pb); /* data size */
79 channels = avio_rb32(pb);
81 codec = ff_codec_get_id(codec_au_tags, id);
83 if (!av_get_bits_per_sample(codec)) {
84 av_log_ask_for_sample(s, "could not determine bits per sample\n");
85 return AVERROR_INVALIDDATA;
88 if (channels == 0 || channels > 64) {
89 av_log(s, AV_LOG_ERROR, "Invalid number of channels %d\n", channels);
90 return AVERROR_INVALIDDATA;
94 /* skip unused data */
95 avio_skip(pb, size - 24);
98 /* now we are ready: build format streams */
99 st = avformat_new_stream(s, NULL);
102 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
103 st->codec->codec_tag = id;
104 st->codec->codec_id = codec;
105 st->codec->channels = channels;
106 st->codec->sample_rate = rate;
107 avpriv_set_pts_info(st, 64, 1, rate);
111 #define BLOCK_SIZE 1024
113 static int au_read_packet(AVFormatContext *s,
118 ret= av_get_packet(s->pb, pkt, BLOCK_SIZE *
119 s->streams[0]->codec->channels *
120 av_get_bits_per_sample(s->streams[0]->codec->codec_id) >> 3);
123 pkt->stream_index = 0;
125 /* note: we need to modify the packet size here to handle the last
131 AVInputFormat ff_au_demuxer = {
133 .long_name = NULL_IF_CONFIG_SMALL("Sun AU"),
134 .read_probe = au_probe,
135 .read_header = au_read_header,
136 .read_packet = au_read_packet,
137 .read_seek = ff_pcm_read_seek,
138 .codec_tag = (const AVCodecTag* const []){ codec_au_tags, 0 },
140 #endif /* CONFIG_AU_DEMUXER */
144 /* if we don't know the size in advance */
145 #define AU_UNKNOWN_SIZE ((uint32_t)(~0))
147 /* AUDIO_FILE header */
148 static int put_au_header(AVIOContext *pb, AVCodecContext *enc)
152 ffio_wfourcc(pb, ".snd"); /* magic number */
153 avio_wb32(pb, 24); /* header size */
154 avio_wb32(pb, AU_UNKNOWN_SIZE); /* data size */
155 avio_wb32(pb, (uint32_t)enc->codec_tag); /* codec ID */
156 avio_wb32(pb, enc->sample_rate);
157 avio_wb32(pb, (uint32_t)enc->channels);
161 static int au_write_header(AVFormatContext *s)
163 AVIOContext *pb = s->pb;
168 if (put_au_header(pb, s->streams[0]->codec) < 0) {
177 static int au_write_packet(AVFormatContext *s, AVPacket *pkt)
179 AVIOContext *pb = s->pb;
180 avio_write(pb, pkt->data, pkt->size);
184 static int au_write_trailer(AVFormatContext *s)
186 AVIOContext *pb = s->pb;
189 if (s->pb->seekable) {
191 /* update file size */
192 file_size = avio_tell(pb);
193 avio_seek(pb, 8, SEEK_SET);
194 avio_wb32(pb, (uint32_t)(file_size - 24));
195 avio_seek(pb, file_size, SEEK_SET);
203 AVOutputFormat ff_au_muxer = {
205 .long_name = NULL_IF_CONFIG_SMALL("Sun AU"),
206 .mime_type = "audio/basic",
208 .audio_codec = AV_CODEC_ID_PCM_S16BE,
209 .video_codec = AV_CODEC_ID_NONE,
210 .write_header = au_write_header,
211 .write_packet = au_write_packet,
212 .write_trailer = au_write_trailer,
213 .codec_tag = (const AVCodecTag* const []){ codec_au_tags, 0 },
215 #endif /* CONFIG_AU_MUXER */