Statistics
| Branch: | Revision:

ffmpeg / libavformat / au.c @ 9dd94f83

History | View | Annotate | Download (5.27 KB)

1 115329f1 Diego Biurrun
/*
2 7fbde343 Aurelien Jacobs
 * AU muxer and demuxer
3 406792e7 Diego Biurrun
 * Copyright (c) 2001 Fabrice Bellard
4 6cea494e Zdenek Kabelac
 *
5 2912e87a Mans Rullgard
 * This file is part of Libav.
6 b78e7197 Diego Biurrun
 *
7 2912e87a Mans Rullgard
 * Libav is free software; you can redistribute it and/or
8 19720f15 Fabrice Bellard
 * modify it under the terms of the GNU Lesser General Public
9
 * License as published by the Free Software Foundation; either
10 b78e7197 Diego Biurrun
 * version 2.1 of the License, or (at your option) any later version.
11 6cea494e Zdenek Kabelac
 *
12 2912e87a Mans Rullgard
 * Libav is distributed in the hope that it will be useful,
13 6cea494e Zdenek Kabelac
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 19720f15 Fabrice Bellard
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15
 * Lesser General Public License for more details.
16 6cea494e Zdenek Kabelac
 *
17 19720f15 Fabrice Bellard
 * You should have received a copy of the GNU Lesser General Public
18 2912e87a Mans Rullgard
 * License along with Libav; if not, write to the Free Software
19 5509bffa Diego Biurrun
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 6cea494e Zdenek Kabelac
 */
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 0abdb293 Anton Khirnov
#include "avio_internal.h"
32 e94204df Aurelien Jacobs
#include "pcm.h"
33 9d9f4119 Måns Rullgård
#include "riff.h"
34 6cea494e Zdenek Kabelac
35
/* if we don't know the size in advance */
36 9ff85412 Diego Biurrun
#define AU_UNKNOWN_SIZE ((uint32_t)(~0))
37 6cea494e Zdenek Kabelac
38
/* The ffmpeg codecs we support, and the IDs they have in the file */
39 7caf0cc6 Michael Niedermayer
static const AVCodecTag codec_au_tags[] = {
40 6cea494e Zdenek Kabelac
    { CODEC_ID_PCM_MULAW, 1 },
41 c5adfd64 Roberto Togni
    { CODEC_ID_PCM_S8, 2 },
42 6cea494e Zdenek Kabelac
    { CODEC_ID_PCM_S16BE, 3 },
43 7b21690a Peter Ross
    { CODEC_ID_PCM_S24BE, 4 },
44
    { CODEC_ID_PCM_S32BE, 5 },
45 249f3243 Peter Ross
    { CODEC_ID_PCM_F32BE, 6 },
46 7b21690a Peter Ross
    { CODEC_ID_PCM_F64BE, 7 },
47 6cea494e Zdenek Kabelac
    { CODEC_ID_PCM_ALAW, 27 },
48 bc2d2a07 Carl Eugen Hoyos
    { CODEC_ID_NONE, 0 },
49 6cea494e Zdenek Kabelac
};
50
51 b250f9c6 Aurelien Jacobs
#if CONFIG_AU_MUXER
52 6cea494e Zdenek Kabelac
/* AUDIO_FILE header */
53 ae628ec1 Anton Khirnov
static int put_au_header(AVIOContext *pb, AVCodecContext *enc)
54 6cea494e Zdenek Kabelac
{
55 bd5a6020 Michael Niedermayer
    if(!enc->codec_tag)
56 6cea494e Zdenek Kabelac
        return -1;
57 0abdb293 Anton Khirnov
    ffio_wfourcc(pb, ".snd");    /* magic number */
58 77eb5504 Anton Khirnov
    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);
63 6cea494e Zdenek Kabelac
    return 0;
64
}
65
66
static int au_write_header(AVFormatContext *s)
67
{
68 ae628ec1 Anton Khirnov
    AVIOContext *pb = s->pb;
69 6cea494e Zdenek Kabelac
70
    s->priv_data = NULL;
71
72
    /* format header */
73 01f4895c Michael Niedermayer
    if (put_au_header(pb, s->streams[0]->codec) < 0) {
74 6cea494e Zdenek Kabelac
        return -1;
75
    }
76
77 b7f2fdde Anton Khirnov
    avio_flush(pb);
78 6cea494e Zdenek Kabelac
79
    return 0;
80
}
81
82 e928649b Michael Niedermayer
static int au_write_packet(AVFormatContext *s, AVPacket *pkt)
83 6cea494e Zdenek Kabelac
{
84 ae628ec1 Anton Khirnov
    AVIOContext *pb = s->pb;
85 77eb5504 Anton Khirnov
    avio_write(pb, pkt->data, pkt->size);
86 6cea494e Zdenek Kabelac
    return 0;
87
}
88
89
static int au_write_trailer(AVFormatContext *s)
90
{
91 ae628ec1 Anton Khirnov
    AVIOContext *pb = s->pb;
92 bc5c918e Diego Biurrun
    int64_t file_size;
93 6cea494e Zdenek Kabelac
94 899681cd Björn Axelsson
    if (!url_is_streamed(s->pb)) {
95 6cea494e Zdenek Kabelac
96
        /* update file size */
97 a2704c97 Anton Khirnov
        file_size = avio_tell(pb);
98 6b4aa5da Anton Khirnov
        avio_seek(pb, 8, SEEK_SET);
99 77eb5504 Anton Khirnov
        avio_wb32(pb, (uint32_t)(file_size - 24));
100 6b4aa5da Anton Khirnov
        avio_seek(pb, file_size, SEEK_SET);
101 6cea494e Zdenek Kabelac
102 b7f2fdde Anton Khirnov
        avio_flush(pb);
103 6cea494e Zdenek Kabelac
    }
104
105
    return 0;
106
}
107 8212568a Diego Biurrun
#endif /* CONFIG_AU_MUXER */
108 6cea494e Zdenek Kabelac
109 c9a65ca8 Fabrice Bellard
static int au_probe(AVProbeData *p)
110
{
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;
115
    else
116
        return 0;
117
}
118
119 6cea494e Zdenek Kabelac
/* au input */
120
static int au_read_header(AVFormatContext *s,
121 4986a429 Fabrice Bellard
                          AVFormatParameters *ap)
122 6cea494e Zdenek Kabelac
{
123
    int size;
124
    unsigned int tag;
125 ae628ec1 Anton Khirnov
    AVIOContext *pb = s->pb;
126 fb65d2ca Diego Pettenò
    unsigned int id, channels, rate;
127
    enum CodecID codec;
128 6cea494e Zdenek Kabelac
    AVStream *st;
129
130
    /* check ".snd" header */
131 b7effd4e Anton Khirnov
    tag = avio_rl32(pb);
132 6cea494e Zdenek Kabelac
    if (tag != MKTAG('.', 's', 'n', 'd'))
133
        return -1;
134 b7effd4e Anton Khirnov
    size = avio_rb32(pb); /* header size */
135
    avio_rb32(pb); /* data size */
136 115329f1 Diego Biurrun
137 b7effd4e Anton Khirnov
    id = avio_rb32(pb);
138
    rate = avio_rb32(pb);
139
    channels = avio_rb32(pb);
140 115329f1 Diego Biurrun
141 1a40491e Daniel Verkamp
    codec = ff_codec_get_id(codec_au_tags, id);
142 6cea494e Zdenek Kabelac
143 0a624147 Peter Ross
    if (!av_get_bits_per_sample(codec)) {
144
        av_log_ask_for_sample(s, "could not determine bits per sample\n");
145
        return AVERROR_INVALIDDATA;
146
    }
147
148 6cea494e Zdenek Kabelac
    if (size >= 24) {
149
        /* skip unused data */
150 45a8a02a Anton Khirnov
        avio_skip(pb, size - 24);
151 6cea494e Zdenek Kabelac
    }
152
153
    /* now we are ready: build format streams */
154 fa26a29d Fabrice Bellard
    st = av_new_stream(s, 0);
155 6cea494e Zdenek Kabelac
    if (!st)
156
        return -1;
157 72415b2a Stefano Sabatini
    st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
158 01f4895c Michael Niedermayer
    st->codec->codec_tag = id;
159
    st->codec->codec_id = codec;
160
    st->codec->channels = channels;
161
    st->codec->sample_rate = rate;
162 595bf4ef Michael Niedermayer
    av_set_pts_info(st, 64, 1, rate);
163 6cea494e Zdenek Kabelac
    return 0;
164
}
165
166 4da715cb Jai Menon
#define BLOCK_SIZE 1024
167 6cea494e Zdenek Kabelac
168
static int au_read_packet(AVFormatContext *s,
169 94ef6864 Fabrice Bellard
                          AVPacket *pkt)
170 6cea494e Zdenek Kabelac
{
171 94ef6864 Fabrice Bellard
    int ret;
172 6cea494e Zdenek Kabelac
173 4da715cb Jai Menon
    ret= av_get_packet(s->pb, pkt, BLOCK_SIZE *
174
                       s->streams[0]->codec->channels *
175
                       av_get_bits_per_sample(s->streams[0]->codec->codec_id) >> 3);
176 2692067a Michael Niedermayer
    if (ret < 0)
177 b46c98bf Reimar Döffinger
        return ret;
178 6cea494e Zdenek Kabelac
    pkt->stream_index = 0;
179
180
    /* note: we need to modify the packet size here to handle the last
181
       packet */
182
    pkt->size = ret;
183 94ef6864 Fabrice Bellard
    return 0;
184 6cea494e Zdenek Kabelac
}
185
186 b250f9c6 Aurelien Jacobs
#if CONFIG_AU_DEMUXER
187 c6610a21 Diego Elio Pettenò
AVInputFormat ff_au_demuxer = {
188 c9a65ca8 Fabrice Bellard
    "au",
189 bde15e74 Stefano Sabatini
    NULL_IF_CONFIG_SMALL("SUN AU format"),
190 c9a65ca8 Fabrice Bellard
    0,
191
    au_probe,
192
    au_read_header,
193
    au_read_packet,
194 9b64a036 Baptiste Coudurier
    NULL,
195 4986a429 Fabrice Bellard
    pcm_read_seek,
196 c1854592 Reimar Döffinger
    .codec_tag= (const AVCodecTag* const []){codec_au_tags, 0},
197 c9a65ca8 Fabrice Bellard
};
198 ff70e601 Måns Rullgård
#endif
199 c9a65ca8 Fabrice Bellard
200 b250f9c6 Aurelien Jacobs
#if CONFIG_AU_MUXER
201 c6610a21 Diego Elio Pettenò
AVOutputFormat ff_au_muxer = {
202 6cea494e Zdenek Kabelac
    "au",
203 bde15e74 Stefano Sabatini
    NULL_IF_CONFIG_SMALL("SUN AU format"),
204 6cea494e Zdenek Kabelac
    "audio/basic",
205
    "au",
206 c9a65ca8 Fabrice Bellard
    0,
207 6cea494e Zdenek Kabelac
    CODEC_ID_PCM_S16BE,
208
    CODEC_ID_NONE,
209
    au_write_header,
210
    au_write_packet,
211
    au_write_trailer,
212 c1854592 Reimar Döffinger
    .codec_tag= (const AVCodecTag* const []){codec_au_tags, 0},
213 6cea494e Zdenek Kabelac
};
214 ff70e601 Måns Rullgård
#endif //CONFIG_AU_MUXER