3 * Copyright (c) 2001 Fabrice Bellard
5 * first version by Francois Revol <revol@free.fr>
7 * This file is part of FFmpeg.
9 * FFmpeg 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 * FFmpeg 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 FFmpeg; 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"
34 #include "libavutil/avassert.h"
36 /* if we don't know the size in advance */
37 #define AU_UNKNOWN_SIZE ((uint32_t)(~0))
38 /* the specification requires an annotation field of at least eight bytes */
39 #define AU_HEADER_SIZE (24+8)
41 static const AVCodecTag codec_au_tags[] = {
42 { AV_CODEC_ID_PCM_MULAW, 1 },
43 { AV_CODEC_ID_PCM_S8, 2 },
44 { AV_CODEC_ID_PCM_S16BE, 3 },
45 { AV_CODEC_ID_PCM_S24BE, 4 },
46 { AV_CODEC_ID_PCM_S32BE, 5 },
47 { AV_CODEC_ID_PCM_F32BE, 6 },
48 { AV_CODEC_ID_PCM_F64BE, 7 },
49 { AV_CODEC_ID_ADPCM_G726LE, 23 },
50 { AV_CODEC_ID_ADPCM_G722,24 },
51 { AV_CODEC_ID_ADPCM_G726LE, 25 },
52 { AV_CODEC_ID_ADPCM_G726LE, 26 },
53 { AV_CODEC_ID_PCM_ALAW, 27 },
54 { AV_CODEC_ID_ADPCM_G726LE, MKBETAG('7','2','6','2') },
55 { AV_CODEC_ID_NONE, 0 },
60 static int au_probe(AVProbeData *p)
62 if (p->buf[0] == '.' && p->buf[1] == 's' &&
63 p->buf[2] == 'n' && p->buf[3] == 'd')
64 return AVPROBE_SCORE_MAX;
69 #define BLOCK_SIZE 1024
71 static int au_read_header(AVFormatContext *s)
73 int size, data_size = 0;
75 AVIOContext *pb = s->pb;
76 unsigned int id, channels, rate;
82 if (tag != MKTAG('.', 's', 'n', 'd'))
83 return AVERROR_INVALIDDATA;
84 size = avio_rb32(pb); /* header size */
85 data_size = avio_rb32(pb); /* data size in bytes */
87 if (data_size < 0 && data_size != AU_UNKNOWN_SIZE) {
88 av_log(s, AV_LOG_ERROR, "Invalid negative data size '%d' found\n", data_size);
89 return AVERROR_INVALIDDATA;
94 channels = avio_rb32(pb);
97 /* skip unused data */
98 avio_skip(pb, size - 24);
101 codec = ff_codec_get_id(codec_au_tags, id);
103 if (codec == AV_CODEC_ID_NONE) {
104 avpriv_request_sample(s, "unknown or unsupported codec tag: %u", id);
105 return AVERROR_PATCHWELCOME;
108 bps = av_get_bits_per_sample(codec);
109 if (codec == AV_CODEC_ID_ADPCM_G726LE) {
110 if (id == MKBETAG('7','2','6','2')) {
113 const uint8_t bpcss[] = {4, 0, 3, 5};
114 av_assert0(id >= 23 && id < 23 + 4);
115 bps = bpcss[id - 23];
118 avpriv_request_sample(s, "Unknown bits per sample");
119 return AVERROR_PATCHWELCOME;
122 if (channels == 0 || channels >= INT_MAX / (BLOCK_SIZE * bps >> 3)) {
123 av_log(s, AV_LOG_ERROR, "Invalid number of channels %u\n", channels);
124 return AVERROR_INVALIDDATA;
127 if (rate == 0 || rate > INT_MAX) {
128 av_log(s, AV_LOG_ERROR, "Invalid sample rate: %u\n", rate);
129 return AVERROR_INVALIDDATA;
132 st = avformat_new_stream(s, NULL);
134 return AVERROR(ENOMEM);
135 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
136 st->codec->codec_tag = id;
137 st->codec->codec_id = codec;
138 st->codec->channels = channels;
139 st->codec->sample_rate = rate;
140 st->codec->bits_per_coded_sample = bps;
141 st->codec->bit_rate = channels * rate * bps;
142 st->codec->block_align = FFMAX(bps * st->codec->channels / 8, 1);
143 if (data_size != AU_UNKNOWN_SIZE)
144 st->duration = (((int64_t)data_size)<<3) / (st->codec->channels * (int64_t)bps);
147 avpriv_set_pts_info(st, 64, 1, rate);
152 AVInputFormat ff_au_demuxer = {
154 .long_name = NULL_IF_CONFIG_SMALL("Sun AU"),
155 .read_probe = au_probe,
156 .read_header = au_read_header,
157 .read_packet = ff_pcm_read_packet,
158 .read_seek = ff_pcm_read_seek,
159 .codec_tag = (const AVCodecTag* const []) { codec_au_tags, 0 },
162 #endif /* CONFIG_AU_DEMUXER */
168 static int au_write_header(AVFormatContext *s)
170 AVIOContext *pb = s->pb;
171 AVCodecContext *enc = s->streams[0]->codec;
173 if (s->nb_streams != 1) {
174 av_log(s, AV_LOG_ERROR, "only one stream is supported\n");
175 return AVERROR(EINVAL);
178 enc->codec_tag = ff_codec_get_tag(codec_au_tags, enc->codec_id);
179 if (!enc->codec_tag) {
180 av_log(s, AV_LOG_ERROR, "unsupported codec\n");
181 return AVERROR(EINVAL);
184 ffio_wfourcc(pb, ".snd"); /* magic number */
185 avio_wb32(pb, AU_HEADER_SIZE); /* header size */
186 avio_wb32(pb, AU_UNKNOWN_SIZE); /* data size */
187 avio_wb32(pb, enc->codec_tag); /* codec ID */
188 avio_wb32(pb, enc->sample_rate);
189 avio_wb32(pb, enc->channels);
190 avio_wb64(pb, 0); /* annotation field */
196 static int au_write_trailer(AVFormatContext *s)
198 AVIOContext *pb = s->pb;
199 int64_t file_size = avio_tell(pb);
201 if (s->pb->seekable && file_size < INT32_MAX) {
202 /* update file size */
203 avio_seek(pb, 8, SEEK_SET);
204 avio_wb32(pb, (uint32_t)(file_size - AU_HEADER_SIZE));
205 avio_seek(pb, file_size, SEEK_SET);
212 AVOutputFormat ff_au_muxer = {
214 .long_name = NULL_IF_CONFIG_SMALL("Sun AU"),
215 .mime_type = "audio/basic",
217 .audio_codec = AV_CODEC_ID_PCM_S16BE,
218 .video_codec = AV_CODEC_ID_NONE,
219 .write_header = au_write_header,
220 .write_packet = ff_raw_write_packet,
221 .write_trailer = au_write_trailer,
222 .codec_tag = (const AVCodecTag* const []) { codec_au_tags, 0 },
223 .flags = AVFMT_NOTIMESTAMPS,
226 #endif /* CONFIG_AU_MUXER */