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 /* The libavcodec codecs we support, and the IDs they have in the file */
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_G722, 24 },
50 { AV_CODEC_ID_PCM_ALAW, 27 },
51 { AV_CODEC_ID_NONE, 0 },
56 static int au_probe(AVProbeData *p)
58 /* check file header */
59 if (p->buf[0] == '.' && p->buf[1] == 's' &&
60 p->buf[2] == 'n' && p->buf[3] == 'd')
61 return AVPROBE_SCORE_MAX;
67 static int au_read_header(AVFormatContext *s)
69 int size, bps, data_size = 0;
71 AVIOContext *pb = s->pb;
72 unsigned int id, channels, rate;
76 /* check ".snd" header */
78 if (tag != MKTAG('.', 's', 'n', 'd'))
79 return AVERROR_INVALIDDATA;
80 size = avio_rb32(pb); /* header size */
81 data_size = avio_rb32(pb); /* data size in bytes */
83 if (data_size < 0 && data_size != AU_UNKNOWN_SIZE) {
84 av_log(s, AV_LOG_ERROR, "Invalid negative data size '%d' found\n", data_size);
85 return AVERROR_INVALIDDATA;
90 channels = avio_rb32(pb);
92 codec = ff_codec_get_id(codec_au_tags, id);
94 if (!(bps = av_get_bits_per_sample(codec))) {
95 av_log_ask_for_sample(s, "could not determine bits per sample\n");
96 return AVERROR_PATCHWELCOME;
99 if (channels == 0 || channels > 64) {
100 av_log(s, AV_LOG_ERROR, "Invalid number of channels %d\n", channels);
101 return AVERROR_INVALIDDATA;
105 /* skip unused data */
106 avio_skip(pb, size - 24);
109 /* now we are ready: build format streams */
110 st = avformat_new_stream(s, NULL);
112 return AVERROR(ENOMEM);
113 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
114 st->codec->codec_tag = id;
115 st->codec->codec_id = codec;
116 st->codec->channels = channels;
117 st->codec->sample_rate = rate;
118 st->codec->block_align = FFMAX(bps * st->codec->channels / 8, 1);
119 if (data_size != AU_UNKNOWN_SIZE)
120 st->duration = (((int64_t)data_size)<<3) / (st->codec->channels * (int64_t)bps);
121 avpriv_set_pts_info(st, 64, 1, rate);
125 AVInputFormat ff_au_demuxer = {
127 .long_name = NULL_IF_CONFIG_SMALL("Sun AU"),
128 .read_probe = au_probe,
129 .read_header = au_read_header,
130 .read_packet = ff_pcm_read_packet,
131 .read_seek = ff_pcm_read_seek,
132 .codec_tag = (const AVCodecTag* const []){ codec_au_tags, 0 },
134 #endif /* CONFIG_AU_DEMUXER */
140 /* AUDIO_FILE header */
141 static int put_au_header(AVIOContext *pb, AVCodecContext *enc)
145 ffio_wfourcc(pb, ".snd"); /* magic number */
146 avio_wb32(pb, AU_HEADER_SIZE); /* header size */
147 avio_wb32(pb, AU_UNKNOWN_SIZE); /* data size */
148 avio_wb32(pb, (uint32_t)enc->codec_tag); /* codec ID */
149 avio_wb32(pb, enc->sample_rate);
150 avio_wb32(pb, (uint32_t)enc->channels);
151 avio_wb64(pb, 0); /* annotation field */
155 static int au_write_header(AVFormatContext *s)
157 AVIOContext *pb = s->pb;
160 if (put_au_header(pb, s->streams[0]->codec) < 0) {
161 return AVERROR(EINVAL);
169 static int au_write_trailer(AVFormatContext *s)
171 AVIOContext *pb = s->pb;
172 int64_t file_size = avio_tell(pb);
174 if (s->pb->seekable && file_size < INT32_MAX) {
175 /* update file size */
176 avio_seek(pb, 8, SEEK_SET);
177 avio_wb32(pb, (uint32_t)(file_size - AU_HEADER_SIZE));
178 avio_seek(pb, file_size, SEEK_SET);
186 AVOutputFormat ff_au_muxer = {
188 .long_name = NULL_IF_CONFIG_SMALL("Sun AU"),
189 .mime_type = "audio/basic",
191 .audio_codec = AV_CODEC_ID_PCM_S16BE,
192 .video_codec = AV_CODEC_ID_NONE,
193 .write_header = au_write_header,
194 .write_packet = ff_raw_write_packet,
195 .write_trailer = au_write_trailer,
196 .codec_tag = (const AVCodecTag* const []){ codec_au_tags, 0 },
198 #endif /* CONFIG_AU_MUXER */