aboutsummaryrefslogtreecommitdiffstats
path: root/libavformat/au.c
blob: e682cbf3058da37b44d15b9aa395454fb52ab938 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
/*
 * AU muxer and demuxer
 * Copyright (c) 2001 Fabrice Bellard
 *
 * first version by Francois Revol <revol@free.fr>
 *
 * This file is part of Libav.
 *
 * Libav is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * Libav is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with Libav; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/*
 * Reference documents:
 * http://www.opengroup.org/public/pubs/external/auformat.html
 * http://www.goice.co.jp/member/mo/formats/au.html
 */

#include "avformat.h"
#include "internal.h"
#include "avio_internal.h"
#include "pcm.h"

static const AVCodecTag codec_au_tags[] = {
    { AV_CODEC_ID_PCM_MULAW,  1 },
    { AV_CODEC_ID_PCM_S8,     2 },
    { AV_CODEC_ID_PCM_S16BE,  3 },
    { AV_CODEC_ID_PCM_S24BE,  4 },
    { AV_CODEC_ID_PCM_S32BE,  5 },
    { AV_CODEC_ID_PCM_F32BE,  6 },
    { AV_CODEC_ID_PCM_F64BE,  7 },
    { AV_CODEC_ID_PCM_ALAW,  27 },
    { AV_CODEC_ID_NONE,       0 },
};

#if CONFIG_AU_DEMUXER

static int au_probe(AVProbeData *p)
{
    if (p->buf[0] == '.' && p->buf[1] == 's' &&
        p->buf[2] == 'n' && p->buf[3] == 'd')
        return AVPROBE_SCORE_MAX;
    else
        return 0;
}

#define BLOCK_SIZE 1024

static int au_read_header(AVFormatContext *s)
{
    int size;
    unsigned int tag;
    AVIOContext *pb = s->pb;
    unsigned int id, channels, rate;
    int bps;
    enum AVCodecID codec;
    AVStream *st;

    tag = avio_rl32(pb);
    if (tag != MKTAG('.', 's', 'n', 'd'))
        return AVERROR_INVALIDDATA;
    size = avio_rb32(pb); /* header size */
    avio_rb32(pb);        /* data size */

    id       = avio_rb32(pb);
    rate     = avio_rb32(pb);
    channels = avio_rb32(pb);

    if (size > 24) {
        /* skip unused data */
        avio_skip(pb, size - 24);
    }

    codec = ff_codec_get_id(codec_au_tags, id);

    if (codec == AV_CODEC_ID_NONE) {
        avpriv_request_sample(s, "unknown or unsupported codec tag: %u", id);
        return AVERROR_PATCHWELCOME;
    }

    bps = av_get_bits_per_sample(codec);
    if (!bps) {
        avpriv_request_sample(s, "Unknown bits per sample");
        return AVERROR_PATCHWELCOME;
    }

    if (channels == 0 || channels >= INT_MAX / (BLOCK_SIZE * bps >> 3)) {
        av_log(s, AV_LOG_ERROR, "Invalid number of channels %u\n", channels);
        return AVERROR_INVALIDDATA;
    }

    if (rate == 0 || rate > INT_MAX) {
        av_log(s, AV_LOG_ERROR, "Invalid sample rate: %u\n", rate);
        return AVERROR_INVALIDDATA;
    }

    st = avformat_new_stream(s, NULL);
    if (!st)
        return AVERROR(ENOMEM);
    st->codec->codec_type  = AVMEDIA_TYPE_AUDIO;
    st->codec->codec_tag   = id;
    st->codec->codec_id    = codec;
    st->codec->channels    = channels;
    st->codec->sample_rate = rate;
    st->codec->bit_rate    = channels * rate * bps;
    st->codec->block_align = channels * bps >> 3;

    st->start_time = 0;
    avpriv_set_pts_info(st, 64, 1, rate);

    return 0;
}

static int au_read_packet(AVFormatContext *s, AVPacket *pkt)
{
    int ret;

    ret = av_get_packet(s->pb, pkt, BLOCK_SIZE *
                        s->streams[0]->codec->block_align);
    if (ret < 0)
        return ret;

    pkt->stream_index = 0;
    pkt->duration     = ret / s->streams[0]->codec->block_align;

    return 0;
}

AVInputFormat ff_au_demuxer = {
    .name        = "au",
    .long_name   = NULL_IF_CONFIG_SMALL("Sun AU"),
    .read_probe  = au_probe,
    .read_header = au_read_header,
    .read_packet = au_read_packet,
    .read_seek   = ff_pcm_read_seek,
    .codec_tag   = (const AVCodecTag* const []) { codec_au_tags, 0 },
};

#endif /* CONFIG_AU_DEMUXER */

#if CONFIG_AU_MUXER

#include "rawenc.h"

/* if we don't know the size in advance */
#define AU_UNKNOWN_SIZE ((uint32_t)(~0))

/* AUDIO_FILE header */
static int put_au_header(AVIOContext *pb, AVCodecContext *enc)
{
    if (!enc->codec_tag)
        return AVERROR(EINVAL);

    ffio_wfourcc(pb, ".snd");                   /* magic number */
    avio_wb32(pb, 24);                          /* header size */
    avio_wb32(pb, AU_UNKNOWN_SIZE);             /* data size */
    avio_wb32(pb, enc->codec_tag);              /* codec ID */
    avio_wb32(pb, enc->sample_rate);
    avio_wb32(pb, enc->channels);

    return 0;
}

static int au_write_header(AVFormatContext *s)
{
    AVIOContext *pb = s->pb;
    int ret;

    s->priv_data = NULL;

    if ((ret = put_au_header(pb, s->streams[0]->codec)) < 0)
        return ret;

    avio_flush(pb);

    return 0;
}

static int au_write_trailer(AVFormatContext *s)
{
    AVIOContext *pb = s->pb;
    int64_t file_size;

    if (s->pb->seekable) {
        /* update file size */
        file_size = avio_tell(pb);
        avio_seek(pb, 8, SEEK_SET);
        avio_wb32(pb, (uint32_t)(file_size - 24));
        avio_seek(pb, file_size, SEEK_SET);
        avio_flush(pb);
    }

    return 0;
}

AVOutputFormat ff_au_muxer = {
    .name          = "au",
    .long_name     = NULL_IF_CONFIG_SMALL("Sun AU"),
    .mime_type     = "audio/basic",
    .extensions    = "au",
    .audio_codec   = AV_CODEC_ID_PCM_S16BE,
    .video_codec   = AV_CODEC_ID_NONE,
    .write_header  = au_write_header,
    .write_packet  = ff_raw_write_packet,
    .write_trailer = au_write_trailer,
    .codec_tag     = (const AVCodecTag* const []) { codec_au_tags, 0 },
    .flags         = AVFMT_NOTIMESTAMPS,
};

#endif /* CONFIG_AU_MUXER */