move unrelated functions declarations out of allformats.h
[libav.git] / libavformat / au.c
1 /*
2 * AU muxer and demuxer
3 * Copyright (c) 2001 Fabrice Bellard.
4 *
5 * This file is part of FFmpeg.
6 *
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.
11 *
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.
16 *
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
20 */
21
22 /*
23 * First version by Francois Revol revol@free.fr
24 *
25 * Reference documents:
26 * http://www.opengroup.org/public/pubs/external/auformat.html
27 * http://www.goice.co.jp/member/mo/formats/au.html
28 */
29
30 #include "avformat.h"
31 #include "raw.h"
32 #include "riff.h"
33
34 /* if we don't know the size in advance */
35 #define AU_UNKNOWN_SIZE ((uint32_t)(~0))
36
37 /* The ffmpeg codecs we support, and the IDs they have in the file */
38 static const AVCodecTag codec_au_tags[] = {
39 { CODEC_ID_PCM_MULAW, 1 },
40 { CODEC_ID_PCM_S16BE, 3 },
41 { CODEC_ID_PCM_ALAW, 27 },
42 { 0, 0 },
43 };
44
45 #ifdef CONFIG_MUXERS
46 /* AUDIO_FILE header */
47 static int put_au_header(ByteIOContext *pb, AVCodecContext *enc)
48 {
49 if(!enc->codec_tag)
50 return -1;
51 put_tag(pb, ".snd"); /* magic number */
52 put_be32(pb, 24); /* header size */
53 put_be32(pb, AU_UNKNOWN_SIZE); /* data size */
54 put_be32(pb, (uint32_t)enc->codec_tag); /* codec ID */
55 put_be32(pb, enc->sample_rate);
56 put_be32(pb, (uint32_t)enc->channels);
57 return 0;
58 }
59
60 static int au_write_header(AVFormatContext *s)
61 {
62 ByteIOContext *pb = &s->pb;
63
64 s->priv_data = NULL;
65
66 /* format header */
67 if (put_au_header(pb, s->streams[0]->codec) < 0) {
68 return -1;
69 }
70
71 put_flush_packet(pb);
72
73 return 0;
74 }
75
76 static int au_write_packet(AVFormatContext *s, AVPacket *pkt)
77 {
78 ByteIOContext *pb = &s->pb;
79 put_buffer(pb, pkt->data, pkt->size);
80 return 0;
81 }
82
83 static int au_write_trailer(AVFormatContext *s)
84 {
85 ByteIOContext *pb = &s->pb;
86 offset_t file_size;
87
88 if (!url_is_streamed(&s->pb)) {
89
90 /* update file size */
91 file_size = url_ftell(pb);
92 url_fseek(pb, 8, SEEK_SET);
93 put_be32(pb, (uint32_t)(file_size - 24));
94 url_fseek(pb, file_size, SEEK_SET);
95
96 put_flush_packet(pb);
97 }
98
99 return 0;
100 }
101 #endif //CONFIG_MUXERS
102
103 static int au_probe(AVProbeData *p)
104 {
105 /* check file header */
106 if (p->buf[0] == '.' && p->buf[1] == 's' &&
107 p->buf[2] == 'n' && p->buf[3] == 'd')
108 return AVPROBE_SCORE_MAX;
109 else
110 return 0;
111 }
112
113 /* au input */
114 static int au_read_header(AVFormatContext *s,
115 AVFormatParameters *ap)
116 {
117 int size;
118 unsigned int tag;
119 ByteIOContext *pb = &s->pb;
120 unsigned int id, codec, channels, rate;
121 AVStream *st;
122
123 /* check ".snd" header */
124 tag = get_le32(pb);
125 if (tag != MKTAG('.', 's', 'n', 'd'))
126 return -1;
127 size = get_be32(pb); /* header size */
128 get_be32(pb); /* data size */
129
130 id = get_be32(pb);
131 rate = get_be32(pb);
132 channels = get_be32(pb);
133
134 codec = codec_get_id(codec_au_tags, id);
135
136 if (size >= 24) {
137 /* skip unused data */
138 url_fseek(pb, size - 24, SEEK_CUR);
139 }
140
141 /* now we are ready: build format streams */
142 st = av_new_stream(s, 0);
143 if (!st)
144 return -1;
145 st->codec->codec_type = CODEC_TYPE_AUDIO;
146 st->codec->codec_tag = id;
147 st->codec->codec_id = codec;
148 st->codec->channels = channels;
149 st->codec->sample_rate = rate;
150 av_set_pts_info(st, 64, 1, rate);
151 return 0;
152 }
153
154 #define MAX_SIZE 4096
155
156 static int au_read_packet(AVFormatContext *s,
157 AVPacket *pkt)
158 {
159 int ret;
160
161 if (url_feof(&s->pb))
162 return AVERROR(EIO);
163 ret= av_get_packet(&s->pb, pkt, MAX_SIZE);
164 if (ret < 0)
165 return AVERROR(EIO);
166 pkt->stream_index = 0;
167
168 /* note: we need to modify the packet size here to handle the last
169 packet */
170 pkt->size = ret;
171 return 0;
172 }
173
174 static int au_read_close(AVFormatContext *s)
175 {
176 return 0;
177 }
178
179 #ifdef CONFIG_AU_DEMUXER
180 AVInputFormat au_demuxer = {
181 "au",
182 "SUN AU Format",
183 0,
184 au_probe,
185 au_read_header,
186 au_read_packet,
187 au_read_close,
188 pcm_read_seek,
189 .codec_tag= (const AVCodecTag*[]){codec_au_tags, 0},
190 };
191 #endif
192
193 #ifdef CONFIG_AU_MUXER
194 AVOutputFormat au_muxer = {
195 "au",
196 "SUN AU Format",
197 "audio/basic",
198 "au",
199 0,
200 CODEC_ID_PCM_S16BE,
201 CODEC_ID_NONE,
202 au_write_header,
203 au_write_packet,
204 au_write_trailer,
205 .codec_tag= (const AVCodecTag*[]){codec_au_tags, 0},
206 };
207 #endif //CONFIG_AU_MUXER