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 Libav.
9  *
10  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23  */
24 
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 "sox.h"
38 
39 typedef struct {
40  int64_t header_size;
41 } SoXContext;
42 
44 {
45  SoXContext *sox = s->priv_data;
46  AVIOContext *pb = s->pb;
47  AVCodecContext *enc = s->streams[0]->codec;
48  AVDictionaryEntry *comment;
49  size_t comment_len = 0, comment_size;
50 
51  comment = av_dict_get(s->metadata, "comment", NULL, 0);
52  if (comment)
53  comment_len = strlen(comment->value);
54  comment_size = (comment_len + 7) & ~7;
55 
56  sox->header_size = SOX_FIXED_HDR + comment_size;
57 
58  if (enc->codec_id == CODEC_ID_PCM_S32LE) {
59  ffio_wfourcc(pb, ".SoX");
60  avio_wl32(pb, sox->header_size);
61  avio_wl64(pb, 0); /* number of samples */
63  avio_wl32(pb, enc->channels);
64  avio_wl32(pb, comment_size);
65  } else if (enc->codec_id == CODEC_ID_PCM_S32BE) {
66  ffio_wfourcc(pb, "XoS.");
67  avio_wb32(pb, sox->header_size);
68  avio_wb64(pb, 0); /* number of samples */
70  avio_wb32(pb, enc->channels);
71  avio_wb32(pb, comment_size);
72  } else {
73  av_log(s, AV_LOG_ERROR, "invalid codec; use pcm_s32le or pcm_s32be\n");
74  return -1;
75  }
76 
77  if (comment_len)
78  avio_write(pb, comment->value, comment_len);
79 
80  for ( ; comment_size > comment_len; comment_len++)
81  avio_w8(pb, 0);
82 
83  avio_flush(pb);
84 
85  return 0;
86 }
87 
89 {
90  AVIOContext *pb = s->pb;
91  avio_write(pb, pkt->data, pkt->size);
92  return 0;
93 }
94 
96 {
97  SoXContext *sox = s->priv_data;
98  AVIOContext *pb = s->pb;
99  AVCodecContext *enc = s->streams[0]->codec;
100 
101  if (s->pb->seekable) {
102  /* update number of samples */
103  int64_t file_size = avio_tell(pb);
104  int64_t num_samples = (file_size - sox->header_size - 4LL) >> 2LL;
105  avio_seek(pb, 8, SEEK_SET);
106  if (enc->codec_id == CODEC_ID_PCM_S32LE) {
107  avio_wl64(pb, num_samples);
108  } else
109  avio_wb64(pb, num_samples);
110  avio_seek(pb, file_size, SEEK_SET);
111 
112  avio_flush(pb);
113  }
114 
115  return 0;
116 }
117 
119  .name = "sox",
120  .long_name = NULL_IF_CONFIG_SMALL("SoX native format"),
121  .extensions = "sox",
122  .priv_data_size = sizeof(SoXContext),
123  .audio_codec = CODEC_ID_PCM_S32LE,
124  .video_codec = CODEC_ID_NONE,
128 };