changing AVCodecContext codec -> *codec in AVStream so additions to AVCodecContext...
[libav.git] / libavformat / au.c
1 /*
2 * AU encoder and decoder
3 * Copyright (c) 2001 Fabrice Bellard.
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
14 *
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19
20 /*
21 * First version by Francois Revol revol@free.fr
22 *
23 * Reference documents:
24 * http://www.opengroup.org/public/pubs/external/auformat.html
25 * http://www.goice.co.jp/member/mo/formats/au.html
26 */
27
28 #include "avformat.h"
29 #include "avi.h"
30
31 /* if we don't know the size in advance */
32 #define AU_UNKOWN_SIZE ((uint32_t)(~0))
33
34 /* The ffmpeg codecs we support, and the IDs they have in the file */
35 static const CodecTag codec_au_tags[] = {
36 { CODEC_ID_PCM_MULAW, 1 },
37 { CODEC_ID_PCM_S16BE, 3 },
38 { CODEC_ID_PCM_ALAW, 27 },
39 { 0, 0 },
40 };
41
42 #ifdef CONFIG_ENCODERS
43 /* AUDIO_FILE header */
44 static int put_au_header(ByteIOContext *pb, AVCodecContext *enc)
45 {
46 if(!enc->codec_tag)
47 enc->codec_tag = codec_get_tag(codec_au_tags, enc->codec_id);
48 if(!enc->codec_tag)
49 return -1;
50 put_tag(pb, ".snd"); /* magic number */
51 put_be32(pb, 24); /* header size */
52 put_be32(pb, AU_UNKOWN_SIZE); /* data size */
53 put_be32(pb, (uint32_t)enc->codec_tag); /* codec ID */
54 put_be32(pb, enc->sample_rate);
55 put_be32(pb, (uint32_t)enc->channels);
56 return 0;
57 }
58
59 static int au_write_header(AVFormatContext *s)
60 {
61 ByteIOContext *pb = &s->pb;
62
63 s->priv_data = NULL;
64
65 /* format header */
66 if (put_au_header(pb, s->streams[0]->codec) < 0) {
67 return -1;
68 }
69
70 put_flush_packet(pb);
71
72 return 0;
73 }
74
75 static int au_write_packet(AVFormatContext *s, AVPacket *pkt)
76 {
77 ByteIOContext *pb = &s->pb;
78 put_buffer(pb, pkt->data, pkt->size);
79 return 0;
80 }
81
82 static int au_write_trailer(AVFormatContext *s)
83 {
84 ByteIOContext *pb = &s->pb;
85 offset_t file_size;
86
87 if (!url_is_streamed(&s->pb)) {
88
89 /* update file size */
90 file_size = url_ftell(pb);
91 url_fseek(pb, 8, SEEK_SET);
92 put_be32(pb, (uint32_t)(file_size - 24));
93 url_fseek(pb, file_size, SEEK_SET);
94
95 put_flush_packet(pb);
96 }
97
98 return 0;
99 }
100 #endif //CONFIG_ENCODERS
101
102 static int au_probe(AVProbeData *p)
103 {
104 /* check file header */
105 if (p->buf_size <= 24)
106 return 0;
107 if (p->buf[0] == '.' && p->buf[1] == 's' &&
108 p->buf[2] == 'n' && p->buf[3] == 'd')
109 return AVPROBE_SCORE_MAX;
110 else
111 return 0;
112 }
113
114 /* au input */
115 static int au_read_header(AVFormatContext *s,
116 AVFormatParameters *ap)
117 {
118 int size;
119 unsigned int tag;
120 ByteIOContext *pb = &s->pb;
121 unsigned int id, codec, channels, rate;
122 AVStream *st;
123
124 /* check ".snd" header */
125 tag = get_le32(pb);
126 if (tag != MKTAG('.', 's', 'n', 'd'))
127 return -1;
128 size = get_be32(pb); /* header size */
129 get_be32(pb); /* data size */
130
131 id = get_be32(pb);
132 rate = get_be32(pb);
133 channels = get_be32(pb);
134
135 codec = codec_get_id(codec_au_tags, id);
136
137 if (size >= 24) {
138 /* skip unused data */
139 url_fseek(pb, size - 24, SEEK_CUR);
140 }
141
142 /* now we are ready: build format streams */
143 st = av_new_stream(s, 0);
144 if (!st)
145 return -1;
146 st->codec->codec_type = CODEC_TYPE_AUDIO;
147 st->codec->codec_tag = id;
148 st->codec->codec_id = codec;
149 st->codec->channels = channels;
150 st->codec->sample_rate = rate;
151 av_set_pts_info(st, 64, 1, rate);
152 return 0;
153 }
154
155 #define MAX_SIZE 4096
156
157 static int au_read_packet(AVFormatContext *s,
158 AVPacket *pkt)
159 {
160 int ret;
161
162 if (url_feof(&s->pb))
163 return AVERROR_IO;
164 ret= av_get_packet(&s->pb, pkt, MAX_SIZE);
165 if (ret < 0)
166 return AVERROR_IO;
167 pkt->stream_index = 0;
168
169 /* note: we need to modify the packet size here to handle the last
170 packet */
171 pkt->size = ret;
172 return 0;
173 }
174
175 static int au_read_close(AVFormatContext *s)
176 {
177 return 0;
178 }
179
180 static AVInputFormat au_iformat = {
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 };
190
191 #ifdef CONFIG_ENCODERS
192 static AVOutputFormat au_oformat = {
193 "au",
194 "SUN AU Format",
195 "audio/basic",
196 "au",
197 0,
198 CODEC_ID_PCM_S16BE,
199 CODEC_ID_NONE,
200 au_write_header,
201 au_write_packet,
202 au_write_trailer,
203 };
204 #endif //CONFIG_ENCODERS
205
206 int au_init(void)
207 {
208 av_register_input_format(&au_iformat);
209 #ifdef CONFIG_ENCODERS
210 av_register_output_format(&au_oformat);
211 #endif //CONFIG_ENCODERS
212 return 0;
213 }