changing AVCodecContext codec -> *codec in AVStream so additions to AVCodecContext...
[libav.git] / libavformat / au.c
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1/*
2 * AU encoder and decoder
19720f15 3 * Copyright (c) 2001 Fabrice Bellard.
6cea494e 4 *
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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.
6cea494e 9 *
19720f15 10 * This library is distributed in the hope that it will be useful,
6cea494e 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
6cea494e 14 *
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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
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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 */
0c1a9eda 32#define AU_UNKOWN_SIZE ((uint32_t)(~0))
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33
34/* The ffmpeg codecs we support, and the IDs they have in the file */
c18a2692 35static const CodecTag codec_au_tags[] = {
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36 { CODEC_ID_PCM_MULAW, 1 },
37 { CODEC_ID_PCM_S16BE, 3 },
38 { CODEC_ID_PCM_ALAW, 27 },
39 { 0, 0 },
40};
41
764ef400 42#ifdef CONFIG_ENCODERS
6cea494e 43/* AUDIO_FILE header */
c18a2692 44static int put_au_header(ByteIOContext *pb, AVCodecContext *enc)
6cea494e 45{
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46 if(!enc->codec_tag)
47 enc->codec_tag = codec_get_tag(codec_au_tags, enc->codec_id);
48 if(!enc->codec_tag)
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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 */
bd5a6020 53 put_be32(pb, (uint32_t)enc->codec_tag); /* codec ID */
6cea494e 54 put_be32(pb, enc->sample_rate);
0c1a9eda 55 put_be32(pb, (uint32_t)enc->channels);
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56 return 0;
57}
58
59static int au_write_header(AVFormatContext *s)
60{
61 ByteIOContext *pb = &s->pb;
62
63 s->priv_data = NULL;
64
65 /* format header */
01f4895c 66 if (put_au_header(pb, s->streams[0]->codec) < 0) {
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67 return -1;
68 }
69
70 put_flush_packet(pb);
71
72 return 0;
73}
74
e928649b 75static int au_write_packet(AVFormatContext *s, AVPacket *pkt)
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76{
77 ByteIOContext *pb = &s->pb;
e928649b 78 put_buffer(pb, pkt->data, pkt->size);
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79 return 0;
80}
81
82static 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);
0c1a9eda 92 put_be32(pb, (uint32_t)(file_size - 24));
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93 url_fseek(pb, file_size, SEEK_SET);
94
95 put_flush_packet(pb);
96 }
97
98 return 0;
99}
764ef400 100#endif //CONFIG_ENCODERS
6cea494e 101
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102static 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
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114/* au input */
115static int au_read_header(AVFormatContext *s,
4986a429 116 AVFormatParameters *ap)
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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 */
fa26a29d 143 st = av_new_stream(s, 0);
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144 if (!st)
145 return -1;
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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;
595bf4ef 151 av_set_pts_info(st, 64, 1, rate);
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152 return 0;
153}
154
155#define MAX_SIZE 4096
156
157static int au_read_packet(AVFormatContext *s,
94ef6864 158 AVPacket *pkt)
6cea494e 159{
94ef6864 160 int ret;
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161
162 if (url_feof(&s->pb))
0bd586c5 163 return AVERROR_IO;
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164 ret= av_get_packet(&s->pb, pkt, MAX_SIZE);
165 if (ret < 0)
0bd586c5 166 return AVERROR_IO;
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167 pkt->stream_index = 0;
168
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169 /* note: we need to modify the packet size here to handle the last
170 packet */
171 pkt->size = ret;
94ef6864 172 return 0;
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173}
174
175static int au_read_close(AVFormatContext *s)
176{
177 return 0;
178}
179
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180static 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,
4986a429 188 pcm_read_seek,
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189};
190
764ef400 191#ifdef CONFIG_ENCODERS
c9a65ca8 192static AVOutputFormat au_oformat = {
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193 "au",
194 "SUN AU Format",
195 "audio/basic",
196 "au",
c9a65ca8 197 0,
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198 CODEC_ID_PCM_S16BE,
199 CODEC_ID_NONE,
200 au_write_header,
201 au_write_packet,
202 au_write_trailer,
6cea494e 203};
764ef400 204#endif //CONFIG_ENCODERS
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205
206int au_init(void)
207{
208 av_register_input_format(&au_iformat);
764ef400 209#ifdef CONFIG_ENCODERS
c9a65ca8 210 av_register_output_format(&au_oformat);
764ef400 211#endif //CONFIG_ENCODERS
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212 return 0;
213}