Use enum typers instead of int.
[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_S8, 2 },
41 { CODEC_ID_PCM_S16BE, 3 },
42 { CODEC_ID_PCM_S24BE, 4 },
43 { CODEC_ID_PCM_S32BE, 5 },
44 { CODEC_ID_PCM_F32BE, 6 },
45 { CODEC_ID_PCM_F64BE, 7 },
46 { CODEC_ID_PCM_ALAW, 27 },
47 { 0, 0 },
48 };
49
50 #ifdef CONFIG_AU_MUXER
51 /* AUDIO_FILE header */
52 static int put_au_header(ByteIOContext *pb, AVCodecContext *enc)
53 {
54 if(!enc->codec_tag)
55 return -1;
56 put_tag(pb, ".snd"); /* magic number */
57 put_be32(pb, 24); /* header size */
58 put_be32(pb, AU_UNKNOWN_SIZE); /* data size */
59 put_be32(pb, (uint32_t)enc->codec_tag); /* codec ID */
60 put_be32(pb, enc->sample_rate);
61 put_be32(pb, (uint32_t)enc->channels);
62 return 0;
63 }
64
65 static int au_write_header(AVFormatContext *s)
66 {
67 ByteIOContext *pb = s->pb;
68
69 s->priv_data = NULL;
70
71 /* format header */
72 if (put_au_header(pb, s->streams[0]->codec) < 0) {
73 return -1;
74 }
75
76 put_flush_packet(pb);
77
78 return 0;
79 }
80
81 static int au_write_packet(AVFormatContext *s, AVPacket *pkt)
82 {
83 ByteIOContext *pb = s->pb;
84 put_buffer(pb, pkt->data, pkt->size);
85 return 0;
86 }
87
88 static int au_write_trailer(AVFormatContext *s)
89 {
90 ByteIOContext *pb = s->pb;
91 offset_t file_size;
92
93 if (!url_is_streamed(s->pb)) {
94
95 /* update file size */
96 file_size = url_ftell(pb);
97 url_fseek(pb, 8, SEEK_SET);
98 put_be32(pb, (uint32_t)(file_size - 24));
99 url_fseek(pb, file_size, SEEK_SET);
100
101 put_flush_packet(pb);
102 }
103
104 return 0;
105 }
106 #endif /* CONFIG_AU_MUXER */
107
108 static int au_probe(AVProbeData *p)
109 {
110 /* check file header */
111 if (p->buf[0] == '.' && p->buf[1] == 's' &&
112 p->buf[2] == 'n' && p->buf[3] == 'd')
113 return AVPROBE_SCORE_MAX;
114 else
115 return 0;
116 }
117
118 /* au input */
119 static int au_read_header(AVFormatContext *s,
120 AVFormatParameters *ap)
121 {
122 int size;
123 unsigned int tag;
124 ByteIOContext *pb = s->pb;
125 unsigned int id, channels, rate;
126 enum CodecID codec;
127 AVStream *st;
128
129 /* check ".snd" header */
130 tag = get_le32(pb);
131 if (tag != MKTAG('.', 's', 'n', 'd'))
132 return -1;
133 size = get_be32(pb); /* header size */
134 get_be32(pb); /* data size */
135
136 id = get_be32(pb);
137 rate = get_be32(pb);
138 channels = get_be32(pb);
139
140 codec = codec_get_id(codec_au_tags, id);
141
142 if (size >= 24) {
143 /* skip unused data */
144 url_fseek(pb, size - 24, SEEK_CUR);
145 }
146
147 /* now we are ready: build format streams */
148 st = av_new_stream(s, 0);
149 if (!st)
150 return -1;
151 st->codec->codec_type = CODEC_TYPE_AUDIO;
152 st->codec->codec_tag = id;
153 st->codec->codec_id = codec;
154 st->codec->channels = channels;
155 st->codec->sample_rate = rate;
156 av_set_pts_info(st, 64, 1, rate);
157 return 0;
158 }
159
160 #define MAX_SIZE 4096
161
162 static int au_read_packet(AVFormatContext *s,
163 AVPacket *pkt)
164 {
165 int ret;
166
167 if (url_feof(s->pb))
168 return AVERROR(EIO);
169 ret= av_get_packet(s->pb, pkt, MAX_SIZE);
170 if (ret < 0)
171 return AVERROR(EIO);
172 pkt->stream_index = 0;
173
174 /* note: we need to modify the packet size here to handle the last
175 packet */
176 pkt->size = ret;
177 return 0;
178 }
179
180 #ifdef CONFIG_AU_DEMUXER
181 AVInputFormat au_demuxer = {
182 "au",
183 NULL_IF_CONFIG_SMALL("SUN AU format"),
184 0,
185 au_probe,
186 au_read_header,
187 au_read_packet,
188 NULL,
189 pcm_read_seek,
190 .codec_tag= (const AVCodecTag* const []){codec_au_tags, 0},
191 };
192 #endif
193
194 #ifdef CONFIG_AU_MUXER
195 AVOutputFormat au_muxer = {
196 "au",
197 NULL_IF_CONFIG_SMALL("SUN AU format"),
198 "audio/basic",
199 "au",
200 0,
201 CODEC_ID_PCM_S16BE,
202 CODEC_ID_NONE,
203 au_write_header,
204 au_write_packet,
205 au_write_trailer,
206 .codec_tag= (const AVCodecTag* const []){codec_au_tags, 0},
207 };
208 #endif //CONFIG_AU_MUXER