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;
60 #define BLOCK_SIZE 1024
63 static int au_read_header(AVFormatContext *s)
67 AVIOContext *pb = s->pb;
68 unsigned int id, channels, rate;
73 /* check ".snd" header */
75 if (tag != MKTAG('.', 's', 'n', 'd'))
77 size = avio_rb32(pb); /* header size */
78 avio_rb32(pb); /* data size */
82 channels = avio_rb32(pb);
85 /* skip unused data */
86 avio_skip(pb, size - 24);
89 codec = ff_codec_get_id(codec_au_tags, id);
91 if (codec == AV_CODEC_ID_NONE) {
92 av_log_ask_for_sample(s, "unknown or unsupported codec tag: %u\n", id);
93 return AVERROR_PATCHWELCOME;
96 bps = av_get_bits_per_sample(codec);
98 av_log_ask_for_sample(s, "could not determine bits per sample\n");
99 return AVERROR_PATCHWELCOME;
102 if (channels == 0 || channels >= INT_MAX / (BLOCK_SIZE * bps >> 3)) {
103 av_log(s, AV_LOG_ERROR, "Invalid number of channels %u\n", channels);
104 return AVERROR_INVALIDDATA;
107 if (rate == 0 || rate > INT_MAX) {
108 av_log(s, AV_LOG_ERROR, "Invalid sample rate: %u\n", rate);
109 return AVERROR_INVALIDDATA;
112 /* now we are ready: build format streams */
113 st = avformat_new_stream(s, NULL);
116 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
117 st->codec->codec_tag = id;
118 st->codec->codec_id = codec;
119 st->codec->channels = channels;
120 st->codec->sample_rate = rate;
121 st->codec->bit_rate = channels * rate * bps;
122 st->codec->block_align = channels * bps >> 3;
125 avpriv_set_pts_info(st, 64, 1, rate);
129 static int au_read_packet(AVFormatContext *s,
134 ret = av_get_packet(s->pb, pkt, BLOCK_SIZE *
135 s->streams[0]->codec->block_align);
138 pkt->stream_index = 0;
139 pkt->duration = ret / s->streams[0]->codec->block_align;
144 AVInputFormat ff_au_demuxer = {
146 .long_name = NULL_IF_CONFIG_SMALL("Sun AU"),
147 .read_probe = au_probe,
148 .read_header = au_read_header,
149 .read_packet = au_read_packet,
150 .read_seek = ff_pcm_read_seek,
151 .codec_tag = (const AVCodecTag* const []){ codec_au_tags, 0 },
153 #endif /* CONFIG_AU_DEMUXER */
157 /* if we don't know the size in advance */
158 #define AU_UNKNOWN_SIZE ((uint32_t)(~0))
160 /* AUDIO_FILE header */
161 static int put_au_header(AVIOContext *pb, AVCodecContext *enc)
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, (uint32_t)enc->codec_tag); /* codec ID */
169 avio_wb32(pb, enc->sample_rate);
170 avio_wb32(pb, (uint32_t)enc->channels);
174 static int au_write_header(AVFormatContext *s)
176 AVIOContext *pb = s->pb;
181 if (put_au_header(pb, s->streams[0]->codec) < 0) {
190 static int au_write_packet(AVFormatContext *s, AVPacket *pkt)
192 AVIOContext *pb = s->pb;
193 avio_write(pb, pkt->data, pkt->size);
197 static int au_write_trailer(AVFormatContext *s)
199 AVIOContext *pb = s->pb;
202 if (s->pb->seekable) {
204 /* update file size */
205 file_size = avio_tell(pb);
206 avio_seek(pb, 8, SEEK_SET);
207 avio_wb32(pb, (uint32_t)(file_size - 24));
208 avio_seek(pb, file_size, SEEK_SET);
216 AVOutputFormat ff_au_muxer = {
218 .long_name = NULL_IF_CONFIG_SMALL("Sun AU"),
219 .mime_type = "audio/basic",
221 .audio_codec = AV_CODEC_ID_PCM_S16BE,
222 .video_codec = AV_CODEC_ID_NONE,
223 .write_header = au_write_header,
224 .write_packet = au_write_packet,
225 .write_trailer = au_write_trailer,
226 .codec_tag = (const AVCodecTag* const []){ codec_au_tags, 0 },
228 #endif /* CONFIG_AU_MUXER */