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
26 * SoX native format muxer
28 * @author Daniel Verkamp
29 * @sa http://wiki.multimedia.cx/index.php?title=SoX_native_intermediate_format
32 #include "libavutil/intreadwrite.h"
33 #include "libavutil/dict.h"
35 #include "avio_internal.h"
42 static int sox_write_header(AVFormatContext *s)
44 SoXContext *sox = s->priv_data;
45 AVIOContext *pb = s->pb;
46 AVCodecContext *enc = s->streams[0]->codec;
47 AVDictionaryEntry *comment;
48 size_t comment_len = 0, comment_size;
50 comment = av_dict_get(s->metadata, "comment", NULL, 0);
52 comment_len = strlen(comment->value);
53 comment_size = (comment_len + 7) & ~7;
55 sox->header_size = SOX_FIXED_HDR + comment_size;
57 if (enc->codec_id == CODEC_ID_PCM_S32LE) {
58 ffio_wfourcc(pb, ".SoX");
59 avio_wl32(pb, sox->header_size);
60 avio_wl64(pb, 0); /* number of samples */
61 avio_wl64(pb, av_dbl2int(enc->sample_rate));
62 avio_wl32(pb, enc->channels);
63 avio_wl32(pb, comment_size);
64 } else if (enc->codec_id == CODEC_ID_PCM_S32BE) {
65 ffio_wfourcc(pb, "XoS.");
66 avio_wb32(pb, sox->header_size);
67 avio_wb64(pb, 0); /* number of samples */
68 avio_wb64(pb, av_dbl2int(enc->sample_rate));
69 avio_wb32(pb, enc->channels);
70 avio_wb32(pb, comment_size);
72 av_log(s, AV_LOG_ERROR, "invalid codec; use pcm_s32le or pcm_s32be\n");
77 avio_write(pb, comment->value, comment_len);
79 for ( ; comment_size > comment_len; comment_len++)
87 static int sox_write_packet(AVFormatContext *s, AVPacket *pkt)
89 AVIOContext *pb = s->pb;
90 avio_write(pb, pkt->data, pkt->size);
94 static int sox_write_trailer(AVFormatContext *s)
96 SoXContext *sox = s->priv_data;
97 AVIOContext *pb = s->pb;
98 AVCodecContext *enc = s->streams[0]->codec;
100 if (s->pb->seekable) {
101 /* update number of samples */
102 int64_t file_size = avio_tell(pb);
103 int64_t num_samples = (file_size - sox->header_size - 4LL) >> 2LL;
104 avio_seek(pb, 8, SEEK_SET);
105 if (enc->codec_id == CODEC_ID_PCM_S32LE) {
106 avio_wl64(pb, num_samples);
108 avio_wb64(pb, num_samples);
109 avio_seek(pb, file_size, SEEK_SET);
117 AVOutputFormat ff_sox_muxer = {
119 NULL_IF_CONFIG_SMALL("SoX native format"),