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"
41 typedef struct SoXContext {
45 static int sox_write_header(AVFormatContext *s)
47 SoXContext *sox = s->priv_data;
48 AVIOContext *pb = s->pb;
49 AVCodecParameters *par = s->streams[0]->codecpar;
50 AVDictionaryEntry *comment;
51 size_t comment_len = 0, comment_size;
53 comment = av_dict_get(s->metadata, "comment", NULL, 0);
55 comment_len = strlen(comment->value);
56 comment_size = FFALIGN(comment_len, 8);
58 sox->header_size = SOX_FIXED_HDR + comment_size;
60 if (par->codec_id == AV_CODEC_ID_PCM_S32LE) {
61 ffio_wfourcc(pb, ".SoX");
62 avio_wl32(pb, sox->header_size);
63 avio_wl64(pb, 0); /* number of samples */
64 avio_wl64(pb, av_double2int(par->sample_rate));
65 avio_wl32(pb, par->ch_layout.nb_channels);
66 avio_wl32(pb, comment_size);
67 } else if (par->codec_id == AV_CODEC_ID_PCM_S32BE) {
68 ffio_wfourcc(pb, "XoS.");
69 avio_wb32(pb, sox->header_size);
70 avio_wb64(pb, 0); /* number of samples */
71 avio_wb64(pb, av_double2int(par->sample_rate));
72 avio_wb32(pb, par->ch_layout.nb_channels);
73 avio_wb32(pb, comment_size);
75 av_log(s, AV_LOG_ERROR, "invalid codec; use pcm_s32le or pcm_s32be\n");
76 return AVERROR(EINVAL);
80 avio_write(pb, comment->value, comment_len);
82 ffio_fill(pb, 0, comment_size - comment_len);
87 static int sox_write_trailer(AVFormatContext *s)
89 SoXContext *sox = s->priv_data;
90 AVIOContext *pb = s->pb;
91 AVCodecParameters *par = s->streams[0]->codecpar;
93 if (s->pb->seekable & AVIO_SEEKABLE_NORMAL) {
94 /* update number of samples */
95 int64_t file_size = avio_tell(pb);
96 int64_t num_samples = (file_size - sox->header_size - 4LL) >> 2LL;
97 avio_seek(pb, 8, SEEK_SET);
98 if (par->codec_id == AV_CODEC_ID_PCM_S32LE) {
99 avio_wl64(pb, num_samples);
101 avio_wb64(pb, num_samples);
102 avio_seek(pb, file_size, SEEK_SET);
108 const FFOutputFormat ff_sox_muxer = {
110 .p.long_name = NULL_IF_CONFIG_SMALL("SoX (Sound eXchange) native"),
111 .p.extensions = "sox",
112 .priv_data_size = sizeof(SoXContext),
113 .p.audio_codec = AV_CODEC_ID_PCM_S32LE,
114 .p.video_codec = AV_CODEC_ID_NONE,
115 .write_header = sox_write_header,
116 .write_packet = ff_raw_write_packet,
117 .write_trailer = sox_write_trailer,
118 .p.flags = AVFMT_NOTIMESTAMPS,