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"
40 static int sox_write_header(AVFormatContext *s)
42 SoXContext *sox = s->priv_data;
43 ByteIOContext *pb = s->pb;
44 AVCodecContext *enc = s->streams[0]->codec;
45 AVMetadataTag *comment;
46 size_t comment_len = 0, comment_size;
48 comment = av_metadata_get(s->metadata, "comment", NULL, 0);
50 comment_len = strlen(comment->value);
51 comment_size = (comment_len + 7) & ~7;
53 sox->header_size = SOX_FIXED_HDR + comment_size;
55 if (enc->codec_id == CODEC_ID_PCM_S32LE) {
57 put_le32(pb, sox->header_size);
58 put_le64(pb, 0); /* number of samples */
59 put_le64(pb, av_dbl2int(enc->sample_rate));
60 put_le32(pb, enc->channels);
61 put_le32(pb, comment_size);
62 } else if (enc->codec_id == CODEC_ID_PCM_S32BE) {
64 put_be32(pb, sox->header_size);
65 put_be64(pb, 0); /* number of samples */
66 put_be64(pb, av_dbl2int(enc->sample_rate));
67 put_be32(pb, enc->channels);
68 put_be32(pb, comment_size);
70 av_log(s, AV_LOG_ERROR, "invalid codec; use pcm_s32le or pcm_s32be\n");
75 put_buffer(pb, comment->value, comment_len);
77 for ( ; comment_size > comment_len; comment_len++)
85 static int sox_write_packet(AVFormatContext *s, AVPacket *pkt)
87 ByteIOContext *pb = s->pb;
88 put_buffer(pb, pkt->data, pkt->size);
92 static int sox_write_trailer(AVFormatContext *s)
94 SoXContext *sox = s->priv_data;
95 ByteIOContext *pb = s->pb;
96 AVCodecContext *enc = s->streams[0]->codec;
98 if (!url_is_streamed(s->pb)) {
99 /* update number of samples */
100 int64_t file_size = url_ftell(pb);
101 int64_t num_samples = (file_size - sox->header_size - 4LL) >> 2LL;
102 url_fseek(pb, 8, SEEK_SET);
103 if (enc->codec_id == CODEC_ID_PCM_S32LE) {
104 put_le64(pb, num_samples);
106 put_be64(pb, num_samples);
107 url_fseek(pb, file_size, SEEK_SET);
109 put_flush_packet(pb);
115 AVOutputFormat ff_sox_muxer = {
117 NULL_IF_CONFIG_SMALL("SoX native format"),