3 * Copyright (c) 2001 Fabrice Bellard
5 * This file is part of FFmpeg.
7 * FFmpeg 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 * FFmpeg 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 FFmpeg; 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 /* if we don't know the size in advance */
36 #define AU_UNKNOWN_SIZE ((uint32_t)(~0))
37 /* the specification requires an annotation field of at least eight bytes */
38 #define AU_HEADER_SIZE (24+8)
40 static const AVCodecTag codec_au_tags[] = {
41 { AV_CODEC_ID_PCM_MULAW, 1 },
42 { AV_CODEC_ID_PCM_S8, 2 },
43 { AV_CODEC_ID_PCM_S16BE, 3 },
44 { AV_CODEC_ID_PCM_S24BE, 4 },
45 { AV_CODEC_ID_PCM_S32BE, 5 },
46 { AV_CODEC_ID_PCM_F32BE, 6 },
47 { AV_CODEC_ID_PCM_F64BE, 7 },
48 { AV_CODEC_ID_ADPCM_G722,24 },
49 { AV_CODEC_ID_PCM_ALAW, 27 },
50 { AV_CODEC_ID_NONE, 0 },
55 static int au_probe(AVProbeData *p)
57 if (p->buf[0] == '.' && p->buf[1] == 's' &&
58 p->buf[2] == 'n' && p->buf[3] == 'd')
59 return AVPROBE_SCORE_MAX;
64 #define BLOCK_SIZE 1024
66 static int au_read_header(AVFormatContext *s)
68 int size, data_size = 0;
70 AVIOContext *pb = s->pb;
71 unsigned int id, channels, rate;
77 if (tag != MKTAG('.', 's', 'n', 'd'))
78 return AVERROR_INVALIDDATA;
79 size = avio_rb32(pb); /* header size */
80 data_size = avio_rb32(pb); /* data size in bytes */
82 if (data_size < 0 && data_size != AU_UNKNOWN_SIZE) {
83 av_log(s, AV_LOG_ERROR, "Invalid negative data size '%d' found\n", data_size);
84 return AVERROR_INVALIDDATA;
89 channels = avio_rb32(pb);
92 /* skip unused data */
93 avio_skip(pb, size - 24);
96 codec = ff_codec_get_id(codec_au_tags, id);
98 if (codec == AV_CODEC_ID_NONE) {
99 av_log_ask_for_sample(s, "unknown or unsupported codec tag: %u\n", id);
100 return AVERROR_PATCHWELCOME;
103 bps = av_get_bits_per_sample(codec);
105 av_log_ask_for_sample(s, "could not determine bits per sample\n");
106 return AVERROR_PATCHWELCOME;
109 if (channels == 0 || channels >= INT_MAX / (BLOCK_SIZE * bps >> 3)) {
110 av_log(s, AV_LOG_ERROR, "Invalid number of channels %u\n", channels);
111 return AVERROR_INVALIDDATA;
114 if (rate == 0 || rate > INT_MAX) {
115 av_log(s, AV_LOG_ERROR, "Invalid sample rate: %u\n", rate);
116 return AVERROR_INVALIDDATA;
119 st = avformat_new_stream(s, NULL);
121 return AVERROR(ENOMEM);
122 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
123 st->codec->codec_tag = id;
124 st->codec->codec_id = codec;
125 st->codec->channels = channels;
126 st->codec->sample_rate = rate;
127 st->codec->bit_rate = channels * rate * bps;
128 st->codec->block_align = FFMAX(bps * st->codec->channels / 8, 1);
129 if (data_size != AU_UNKNOWN_SIZE)
130 st->duration = (((int64_t)data_size)<<3) / (st->codec->channels * (int64_t)bps);
133 avpriv_set_pts_info(st, 64, 1, rate);
138 AVInputFormat ff_au_demuxer = {
140 .long_name = NULL_IF_CONFIG_SMALL("Sun AU"),
141 .read_probe = au_probe,
142 .read_header = au_read_header,
143 .read_packet = ff_pcm_read_packet,
144 .read_seek = ff_pcm_read_seek,
145 .codec_tag = (const AVCodecTag* const []) { codec_au_tags, 0 },
148 #endif /* CONFIG_AU_DEMUXER */
154 static int au_write_header(AVFormatContext *s)
156 AVIOContext *pb = s->pb;
157 AVCodecContext *enc = s->streams[0]->codec;
159 if (s->nb_streams != 1) {
160 av_log(s, AV_LOG_ERROR, "only one stream is supported\n");
161 return AVERROR(EINVAL);
164 enc->codec_tag = ff_codec_get_tag(codec_au_tags, enc->codec_id);
165 if (!enc->codec_tag) {
166 av_log(s, AV_LOG_ERROR, "unsupported codec\n");
167 return AVERROR(EINVAL);
170 ffio_wfourcc(pb, ".snd"); /* magic number */
171 avio_wb32(pb, AU_HEADER_SIZE); /* header size */
172 avio_wb32(pb, AU_UNKNOWN_SIZE); /* data size */
173 avio_wb32(pb, enc->codec_tag); /* codec ID */
174 avio_wb32(pb, enc->sample_rate);
175 avio_wb32(pb, enc->channels);
176 avio_wb64(pb, 0); /* annotation field */
182 static int au_write_trailer(AVFormatContext *s)
184 AVIOContext *pb = s->pb;
185 int64_t file_size = avio_tell(pb);
187 if (s->pb->seekable && file_size < INT32_MAX) {
188 /* update file size */
189 avio_seek(pb, 8, SEEK_SET);
190 avio_wb32(pb, (uint32_t)(file_size - AU_HEADER_SIZE));
191 avio_seek(pb, file_size, SEEK_SET);
198 AVOutputFormat ff_au_muxer = {
200 .long_name = NULL_IF_CONFIG_SMALL("Sun AU"),
201 .mime_type = "audio/basic",
203 .audio_codec = AV_CODEC_ID_PCM_S16BE,
204 .video_codec = AV_CODEC_ID_NONE,
205 .write_header = au_write_header,
206 .write_packet = ff_raw_write_packet,
207 .write_trailer = au_write_trailer,
208 .codec_tag = (const AVCodecTag* const []) { codec_au_tags, 0 },
211 #endif /* CONFIG_AU_MUXER */