1 /*
2 * SoX native format muxer
3 * Copyright (c) 2009 Daniel Verkamp <daniel@drv.nu>
4 *
5 * Based on libSoX sox-fmt.c
6 * Copyright (c) 2008 robs@users.sourceforge.net
7 *
8 * This file is part of FFmpeg.
9 *
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.
14 *
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.
19 *
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
23 */
24
25 /**
26 * @file
27 * SoX native format muxer
28 * @author Daniel Verkamp
29 * @see http://wiki.multimedia.cx/index.php?title=SoX_native_intermediate_format
30 */
31
32 #include "libavutil/intreadwrite.h"
33 #include "libavutil/intfloat.h"
34 #include "libavutil/dict.h"
35 #include "avformat.h"
36 #include "avio_internal.h"
37 #include "rawenc.h"
38 #include "sox.h"
39
40 typedef struct SoXContext {
41 int64_t header_size;
42 } SoXContext;
43
sox_write_header(AVFormatContext * s)44 static int sox_write_header(AVFormatContext *s)
45 {
46 SoXContext *sox = s->priv_data;
47 AVIOContext *pb = s->pb;
48 AVCodecParameters *par = s->streams[0]->codecpar;
49 AVDictionaryEntry *comment;
50 size_t comment_len = 0, comment_size;
51
52 comment = av_dict_get(s->metadata, "comment", NULL, 0);
53 if (comment)
54 comment_len = strlen(comment->value);
55 comment_size = FFALIGN(comment_len, 8);
56
57 sox->header_size = SOX_FIXED_HDR + comment_size;
58
59 if (par->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(par->sample_rate));
64 avio_wl32(pb, par->channels);
65 avio_wl32(pb, comment_size);
66 } else if (par->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(par->sample_rate));
71 avio_wb32(pb, par->channels);
72 avio_wb32(pb, comment_size);
73 } else {
74 av_log(s, AV_LOG_ERROR, "invalid codec; use pcm_s32le or pcm_s32be\n");
75 return AVERROR(EINVAL);
76 }
77
78 if (comment_len)
79 avio_write(pb, comment->value, comment_len);
80
81 ffio_fill(pb, 0, comment_size - comment_len);
82
83 return 0;
84 }
85
sox_write_trailer(AVFormatContext * s)86 static int sox_write_trailer(AVFormatContext *s)
87 {
88 SoXContext *sox = s->priv_data;
89 AVIOContext *pb = s->pb;
90 AVCodecParameters *par = s->streams[0]->codecpar;
91
92 if (s->pb->seekable & AVIO_SEEKABLE_NORMAL) {
93 /* update number of samples */
94 int64_t file_size = avio_tell(pb);
95 int64_t num_samples = (file_size - sox->header_size - 4LL) >> 2LL;
96 avio_seek(pb, 8, SEEK_SET);
97 if (par->codec_id == AV_CODEC_ID_PCM_S32LE) {
98 avio_wl64(pb, num_samples);
99 } else
100 avio_wb64(pb, num_samples);
101 avio_seek(pb, file_size, SEEK_SET);
102 }
103
104 return 0;
105 }
106
107 AVOutputFormat ff_sox_muxer = {
108 .name = "sox",
109 .long_name = NULL_IF_CONFIG_SMALL("SoX native"),
110 .extensions = "sox",
111 .priv_data_size = sizeof(SoXContext),
112 .audio_codec = AV_CODEC_ID_PCM_S32LE,
113 .video_codec = AV_CODEC_ID_NONE,
114 .write_header = sox_write_header,
115 .write_packet = ff_raw_write_packet,
116 .write_trailer = sox_write_trailer,
117 .flags = AVFMT_NOTIMESTAMPS,
118 };
119