2 * SoX native format muxer
3 * Copyright (c) 2009 Daniel Verkamp <daniel@drv.nu>
5 * Based on libSoX sox-fmt.c
6 * Copyright (c) 2008 robs@users.sourceforge.net
8 * This file is part of FFmpeg.
10 * FFmpeg is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU Lesser General Public
12 * License as published by the Free Software Foundation; either
13 * version 2.1 of the License, or (at your option) any later version.
15 * FFmpeg is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * Lesser General Public License for more details.
20 * You should have received a copy of the GNU Lesser General Public
21 * License along with FFmpeg; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
27 * SoX native format muxer
28 * @author Daniel Verkamp
29 * @see http://wiki.multimedia.cx/index.php?title=SoX_native_intermediate_format
32 #include "libavutil/intreadwrite.h"
33 #include "libavutil/intfloat.h"
34 #include "libavutil/dict.h"
36 #include "avio_internal.h"
44 static int sox_write_header(AVFormatContext
*s
)
46 SoXContext
*sox
= s
->priv_data
;
47 AVIOContext
*pb
= s
->pb
;
48 AVCodecContext
*enc
= s
->streams
[0]->codec
;
49 AVDictionaryEntry
*comment
;
50 size_t comment_len
= 0, comment_size
;
52 comment
= av_dict_get(s
->metadata
, "comment", NULL
, 0);
54 comment_len
= strlen(comment
->value
);
55 comment_size
= FFALIGN(comment_len
, 8);
57 sox
->header_size
= SOX_FIXED_HDR
+ comment_size
;
59 if (enc
->codec_id
== AV_CODEC_ID_PCM_S32LE
) {
60 ffio_wfourcc(pb
, ".SoX");
61 avio_wl32(pb
, sox
->header_size
);
62 avio_wl64(pb
, 0); /* number of samples */
63 avio_wl64(pb
, av_double2int(enc
->sample_rate
));
64 avio_wl32(pb
, enc
->channels
);
65 avio_wl32(pb
, comment_size
);
66 } else if (enc
->codec_id
== AV_CODEC_ID_PCM_S32BE
) {
67 ffio_wfourcc(pb
, "XoS.");
68 avio_wb32(pb
, sox
->header_size
);
69 avio_wb64(pb
, 0); /* number of samples */
70 avio_wb64(pb
, av_double2int(enc
->sample_rate
));
71 avio_wb32(pb
, enc
->channels
);
72 avio_wb32(pb
, comment_size
);
74 av_log(s
, AV_LOG_ERROR
, "invalid codec; use pcm_s32le or pcm_s32be\n");
75 return AVERROR(EINVAL
);
79 avio_write(pb
, comment
->value
, comment_len
);
81 ffio_fill(pb
, 0, comment_size
- comment_len
);
88 static int sox_write_trailer(AVFormatContext
*s
)
90 SoXContext
*sox
= s
->priv_data
;
91 AVIOContext
*pb
= s
->pb
;
92 AVCodecContext
*enc
= s
->streams
[0]->codec
;
94 if (s
->pb
->seekable
) {
95 /* update number of samples */
96 int64_t file_size
= avio_tell(pb
);
97 int64_t num_samples
= (file_size
- sox
->header_size
- 4LL) >> 2LL;
98 avio_seek(pb
, 8, SEEK_SET
);
99 if (enc
->codec_id
== AV_CODEC_ID_PCM_S32LE
) {
100 avio_wl64(pb
, num_samples
);
102 avio_wb64(pb
, num_samples
);
103 avio_seek(pb
, file_size
, SEEK_SET
);
111 AVOutputFormat ff_sox_muxer
= {
113 .long_name
= NULL_IF_CONFIG_SMALL("SoX native"),
115 .priv_data_size
= sizeof(SoXContext
),
116 .audio_codec
= AV_CODEC_ID_PCM_S32LE
,
117 .video_codec
= AV_CODEC_ID_NONE
,
118 .write_header
= sox_write_header
,
119 .write_packet
= ff_raw_write_packet
,
120 .write_trailer
= sox_write_trailer
,
121 .flags
= AVFMT_NOTIMESTAMPS
,