3 * Copyright (c) 2001 Fabrice Bellard
5 * first version by Francois Revol <revol@free.fr>
7 * This file is part of Libav.
9 * Libav is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
14 * Libav is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with Libav; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 static const AVCodecTag codec_au_tags[] = {
36 { AV_CODEC_ID_PCM_MULAW, 1 },
37 { AV_CODEC_ID_PCM_S8, 2 },
38 { AV_CODEC_ID_PCM_S16BE, 3 },
39 { AV_CODEC_ID_PCM_S24BE, 4 },
40 { AV_CODEC_ID_PCM_S32BE, 5 },
41 { AV_CODEC_ID_PCM_F32BE, 6 },
42 { AV_CODEC_ID_PCM_F64BE, 7 },
43 { AV_CODEC_ID_PCM_ALAW, 27 },
44 { AV_CODEC_ID_NONE, 0 },
49 static int au_probe(AVProbeData *p)
51 if (p->buf[0] == '.' && p->buf[1] == 's' &&
52 p->buf[2] == 'n' && p->buf[3] == 'd')
53 return AVPROBE_SCORE_MAX;
58 #define BLOCK_SIZE 1024
60 static int au_read_header(AVFormatContext *s)
64 AVIOContext *pb = s->pb;
65 unsigned int id, channels, rate;
71 if (tag != MKTAG('.', 's', 'n', 'd'))
72 return AVERROR_INVALIDDATA;
73 size = avio_rb32(pb); /* header size */
74 avio_rb32(pb); /* data size */
78 channels = avio_rb32(pb);
81 /* skip unused data */
82 avio_skip(pb, size - 24);
85 codec = ff_codec_get_id(codec_au_tags, id);
87 if (codec == AV_CODEC_ID_NONE) {
88 avpriv_request_sample(s, "unknown or unsupported codec tag: %u", id);
89 return AVERROR_PATCHWELCOME;
92 bps = av_get_bits_per_sample(codec);
94 avpriv_request_sample(s, "Unknown bits per sample");
95 return AVERROR_PATCHWELCOME;
98 if (channels == 0 || channels >= INT_MAX / (BLOCK_SIZE * bps >> 3)) {
99 av_log(s, AV_LOG_ERROR, "Invalid number of channels %u\n", channels);
100 return AVERROR_INVALIDDATA;
103 if (rate == 0 || rate > INT_MAX) {
104 av_log(s, AV_LOG_ERROR, "Invalid sample rate: %u\n", rate);
105 return AVERROR_INVALIDDATA;
108 st = avformat_new_stream(s, NULL);
110 return AVERROR(ENOMEM);
111 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
112 st->codec->codec_tag = id;
113 st->codec->codec_id = codec;
114 st->codec->channels = channels;
115 st->codec->sample_rate = rate;
116 st->codec->bit_rate = channels * rate * bps;
117 st->codec->block_align = channels * bps >> 3;
120 avpriv_set_pts_info(st, 64, 1, rate);
125 static int au_read_packet(AVFormatContext *s, AVPacket *pkt)
129 ret = av_get_packet(s->pb, pkt, BLOCK_SIZE *
130 s->streams[0]->codec->block_align);
134 pkt->stream_index = 0;
135 pkt->duration = ret / s->streams[0]->codec->block_align;
140 AVInputFormat ff_au_demuxer = {
142 .long_name = NULL_IF_CONFIG_SMALL("Sun AU"),
143 .read_probe = au_probe,
144 .read_header = au_read_header,
145 .read_packet = au_read_packet,
146 .read_seek = ff_pcm_read_seek,
147 .codec_tag = (const AVCodecTag* const []) { codec_au_tags, 0 },
150 #endif /* CONFIG_AU_DEMUXER */
156 /* if we don't know the size in advance */
157 #define AU_UNKNOWN_SIZE ((uint32_t)(~0))
159 /* AUDIO_FILE header */
160 static int put_au_header(AVIOContext *pb, AVCodecContext *enc)
163 return AVERROR(EINVAL);
165 ffio_wfourcc(pb, ".snd"); /* magic number */
166 avio_wb32(pb, 24); /* header size */
167 avio_wb32(pb, AU_UNKNOWN_SIZE); /* data size */
168 avio_wb32(pb, enc->codec_tag); /* codec ID */
169 avio_wb32(pb, enc->sample_rate);
170 avio_wb32(pb, enc->channels);
175 static int au_write_header(AVFormatContext *s)
177 AVIOContext *pb = s->pb;
182 if ((ret = put_au_header(pb, s->streams[0]->codec)) < 0)
190 static int au_write_trailer(AVFormatContext *s)
192 AVIOContext *pb = s->pb;
195 if (s->pb->seekable) {
196 /* update file size */
197 file_size = avio_tell(pb);
198 avio_seek(pb, 8, SEEK_SET);
199 avio_wb32(pb, (uint32_t)(file_size - 24));
200 avio_seek(pb, file_size, SEEK_SET);
207 AVOutputFormat ff_au_muxer = {
209 .long_name = NULL_IF_CONFIG_SMALL("Sun AU"),
210 .mime_type = "audio/basic",
212 .audio_codec = AV_CODEC_ID_PCM_S16BE,
213 .video_codec = AV_CODEC_ID_NONE,
214 .write_header = au_write_header,
215 .write_packet = ff_raw_write_packet,
216 .write_trailer = au_write_trailer,
217 .codec_tag = (const AVCodecTag* const []) { codec_au_tags, 0 },
218 .flags = AVFMT_NOTIMESTAMPS,
221 #endif /* CONFIG_AU_MUXER */