aboutsummaryrefslogtreecommitdiffstats
path: root/libavformat/au.c
blob: bb9d5d5b56a3330510ce651d8a04f1fdced2a8f6 (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
/*
 * AU muxer and demuxer
 * Copyright (c) 2001 Fabrice Bellard
 *
 * 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
 */

/*
 * First version by Francois Revol revol@free.fr
 *
 * 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"
#include "riff.h"

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

/* The libavcodec codecs we support, and the IDs they have in the file */
static const AVCodecTag codec_au_tags[] = {
    { CODEC_ID_PCM_MULAW, 1 },
    { CODEC_ID_PCM_S8, 2 },
    { CODEC_ID_PCM_S16BE, 3 },
    { CODEC_ID_PCM_S24BE, 4 },
    { CODEC_ID_PCM_S32BE, 5 },
    { CODEC_ID_PCM_F32BE, 6 },
    { CODEC_ID_PCM_F64BE, 7 },
    { CODEC_ID_PCM_ALAW, 27 },
    { CODEC_ID_NONE, 0 },
};

#if CONFIG_AU_MUXER
/* AUDIO_FILE header */
static int put_au_header(AVIOContext *pb, AVCodecContext *enc)
{
    if(!enc->codec_tag)
        return -1;
    ffio_wfourcc(pb, ".snd");    /* magic number */
    avio_wb32(pb, 24);           /* header size */
    avio_wb32(pb, AU_UNKNOWN_SIZE); /* data size */
    avio_wb32(pb, (uint32_t)enc->codec_tag);     /* codec ID */
    avio_wb32(pb, enc->sample_rate);
    avio_wb32(pb, (uint32_t)enc->channels);
    return 0;
}

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

    s->priv_data = NULL;

    /* format header */
    if (put_au_header(pb, s->streams[0]->codec) < 0) {
        return -1;
    }

    avio_flush(pb);

    return 0;
}

static int au_write_packet(AVFormatContext *s, AVPacket *pkt)
{
    AVIOContext *pb = s->pb;
    avio_write(pb, pkt->data, pkt->size);
    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;
}
#endif /* CONFIG_AU_MUXER */

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

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

    /* check ".snd" header */
    tag = avio_rl32(pb);
    if (tag != MKTAG('.', 's', 'n', 'd'))
        return -1;
    size = avio_rb32(pb); /* header size */
    avio_rb32(pb); /* data size */

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

    codec = ff_codec_get_id(codec_au_tags, id);

    if (!av_get_bits_per_sample(codec)) {
        av_log_ask_for_sample(s, "could not determine bits per sample\n");
        return AVERROR_INVALIDDATA;
    }

    if (channels == 0 || channels > 64) {
        av_log(s, AV_LOG_ERROR, "Invalid number of channels %d\n", channels);
        return AVERROR_INVALIDDATA;
    }

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

    /* now we are ready: build format streams */
    st = avformat_new_stream(s, NULL);
    if (!st)
        return -1;
    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;
    avpriv_set_pts_info(st, 64, 1, rate);
    return 0;
}

#define BLOCK_SIZE 1024

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

    ret= av_get_packet(s->pb, pkt, BLOCK_SIZE *
                       s->streams[0]->codec->channels *
                       av_get_bits_per_sample(s->streams[0]->codec->codec_id) >> 3);
    if (ret < 0)
        return ret;
    pkt->stream_index = 0;

    /* note: we need to modify the packet size here to handle the last
       packet */
    pkt->size = ret;
    return 0;
}

#if CONFIG_AU_DEMUXER
AVInputFormat ff_au_demuxer = {
    .name           = "au",
    .long_name      = NULL_IF_CONFIG_SMALL("SUN AU format"),
    .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

#if CONFIG_AU_MUXER
AVOutputFormat ff_au_muxer = {
    .name              = "au",
    .long_name         = NULL_IF_CONFIG_SMALL("SUN AU format"),
    .mime_type         = "audio/basic",
    .extensions        = "au",
    .audio_codec       = CODEC_ID_PCM_S16BE,
    .video_codec       = CODEC_ID_NONE,
    .write_header      = au_write_header,
    .write_packet      = au_write_packet,
    .write_trailer     = au_write_trailer,
    .codec_tag         = (const AVCodecTag* const []){ codec_au_tags, 0 },
};
#endif //CONFIG_AU_MUXER