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soxenc.c
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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 {
41  int64_t header_size;
42 } SoXContext;
43 
45 {
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;
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 (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 */
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 */
71  avio_wb32(pb, enc->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 -1;
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  avio_flush(pb);
84 
85  return 0;
86 }
87 
89 {
90  SoXContext *sox = s->priv_data;
91  AVIOContext *pb = s->pb;
92  AVCodecContext *enc = s->streams[0]->codec;
93 
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);
101  } else
102  avio_wb64(pb, num_samples);
103  avio_seek(pb, file_size, SEEK_SET);
104 
105  avio_flush(pb);
106  }
107 
108  return 0;
109 }
110 
112  .name = "sox",
113  .long_name = NULL_IF_CONFIG_SMALL("SoX native"),
114  .extensions = "sox",
115  .priv_data_size = sizeof(SoXContext),
116  .audio_codec = AV_CODEC_ID_PCM_S32LE,
117  .video_codec = AV_CODEC_ID_NONE,
121 };