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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