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
31 #include "avio_internal.h"
35 /* if we don't know the size in advance */
36 #define AU_UNKNOWN_SIZE ((uint32_t)(~0))
38 /* The libavcodec codecs we support, and the IDs they have in the file */
39 static const AVCodecTag codec_au_tags[] = {
40 { CODEC_ID_PCM_MULAW, 1 },
41 { CODEC_ID_PCM_S8, 2 },
42 { CODEC_ID_PCM_S16BE, 3 },
43 { CODEC_ID_PCM_S24BE, 4 },
44 { CODEC_ID_PCM_S32BE, 5 },
45 { CODEC_ID_PCM_F32BE, 6 },
46 { CODEC_ID_PCM_F64BE, 7 },
47 { CODEC_ID_PCM_ALAW, 27 },
52 /* AUDIO_FILE header */
53 static int put_au_header(AVIOContext *pb, AVCodecContext *enc)
57 ffio_wfourcc(pb, ".snd"); /* magic number */
58 avio_wb32(pb, 24); /* header size */
59 avio_wb32(pb, AU_UNKNOWN_SIZE); /* data size */
60 avio_wb32(pb, (uint32_t)enc->codec_tag); /* codec ID */
61 avio_wb32(pb, enc->sample_rate);
62 avio_wb32(pb, (uint32_t)enc->channels);
66 static int au_write_header(AVFormatContext *s)
68 AVIOContext *pb = s->pb;
73 if (put_au_header(pb, s->streams[0]->codec) < 0) {
82 static int au_write_packet(AVFormatContext *s, AVPacket *pkt)
84 AVIOContext *pb = s->pb;
85 avio_write(pb, pkt->data, pkt->size);
89 static int au_write_trailer(AVFormatContext *s)
91 AVIOContext *pb = s->pb;
94 if (s->pb->seekable) {
96 /* update file size */
97 file_size = avio_tell(pb);
98 avio_seek(pb, 8, SEEK_SET);
99 avio_wb32(pb, (uint32_t)(file_size - 24));
100 avio_seek(pb, file_size, SEEK_SET);
107 #endif /* CONFIG_AU_MUXER */
109 static int au_probe(AVProbeData *p)
111 /* check file header */
112 if (p->buf[0] == '.' && p->buf[1] == 's' &&
113 p->buf[2] == 'n' && p->buf[3] == 'd')
114 return AVPROBE_SCORE_MAX;
120 static int au_read_header(AVFormatContext *s,
121 AVFormatParameters *ap)
123 int size, bps, data_size = 0;
125 AVIOContext *pb = s->pb;
126 unsigned int id, channels, rate;
130 /* check ".snd" header */
132 if (tag != MKTAG('.', 's', 'n', 'd'))
134 size = avio_rb32(pb); /* header size */
135 data_size = avio_rb32(pb); /* data size in bytes */
137 if (data_size < 0 && data_size != AU_UNKNOWN_SIZE) {
138 av_log(s, AV_LOG_ERROR, "Invalid negative data size '%d' found\n", data_size);
139 return AVERROR_INVALIDDATA;
143 rate = avio_rb32(pb);
144 channels = avio_rb32(pb);
146 codec = ff_codec_get_id(codec_au_tags, id);
148 if (!(bps = av_get_bits_per_sample(codec))) {
149 av_log_ask_for_sample(s, "could not determine bits per sample\n");
150 return AVERROR_INVALIDDATA;
154 /* skip unused data */
155 avio_skip(pb, size - 24);
158 /* now we are ready: build format streams */
159 st = avformat_new_stream(s, NULL);
162 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
163 st->codec->codec_tag = id;
164 st->codec->codec_id = codec;
165 st->codec->channels = channels;
166 st->codec->sample_rate = rate;
167 if (data_size != AU_UNKNOWN_SIZE)
168 st->duration = (((int64_t)data_size)<<3) / (st->codec->channels * bps);
169 av_set_pts_info(st, 64, 1, rate);
173 #define BLOCK_SIZE 1024
175 static int au_read_packet(AVFormatContext *s,
180 ret= av_get_packet(s->pb, pkt, BLOCK_SIZE *
181 s->streams[0]->codec->channels *
182 av_get_bits_per_sample(s->streams[0]->codec->codec_id) >> 3);
185 pkt->stream_index = 0;
187 /* note: we need to modify the packet size here to handle the last
193 #if CONFIG_AU_DEMUXER
194 AVInputFormat ff_au_demuxer = {
196 .long_name = NULL_IF_CONFIG_SMALL("SUN AU format"),
197 .read_probe = au_probe,
198 .read_header = au_read_header,
199 .read_packet = au_read_packet,
200 .read_seek = pcm_read_seek,
201 .codec_tag= (const AVCodecTag* const []){codec_au_tags, 0},
206 AVOutputFormat ff_au_muxer = {
208 .long_name = NULL_IF_CONFIG_SMALL("SUN AU format"),
209 .mime_type = "audio/basic",
211 .audio_codec = CODEC_ID_PCM_S16BE,
212 .video_codec = CODEC_ID_NONE,
213 .write_header = au_write_header,
214 .write_packet = au_write_packet,
215 .write_trailer = au_write_trailer,
216 .codec_tag= (const AVCodecTag* const []){codec_au_tags, 0},
218 #endif //CONFIG_AU_MUXER