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 */
38static 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#if CONFIG_AU_MUXER
51/* AUDIO_FILE header */
52static 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
65static 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
81static 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
88static int au_write_trailer(AVFormatContext *s)
89{
90    ByteIOContext *pb = s->pb;
91    int64_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
108static 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 */
119static 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
162static 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#if CONFIG_AU_DEMUXER
181AVInputFormat 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#if CONFIG_AU_MUXER
195AVOutputFormat 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
209