23d1be872154eba794b03e89e9e30fb83ac24f02
[libav.git] / libavformat / flacenc.c
1 /*
2 * raw FLAC muxer
3 * Copyright (c) 2006-2009 Justin Ruggles
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 #include "libavcodec/flac.h"
23 #include "avformat.h"
24
25 static int flac_write_header(struct AVFormatContext *s)
26 {
27 static const uint8_t header[8] = {
28 0x66, 0x4C, 0x61, 0x43, 0x80, 0x00, 0x00, 0x22
29 };
30 AVCodecContext *codec = s->streams[0]->codec;
31 uint8_t *streaminfo;
32 enum FLACExtradataFormat format;
33
34 if (!ff_flac_is_extradata_valid(codec, &format, &streaminfo))
35 return -1;
36
37 if (format == FLAC_EXTRADATA_FORMAT_STREAMINFO) {
38 put_buffer(s->pb, header, 8);
39 }
40
41 /* write STREAMINFO or full header */
42 put_buffer(s->pb, codec->extradata, codec->extradata_size);
43
44 return 0;
45 }
46
47 static int flac_write_trailer(struct AVFormatContext *s)
48 {
49 ByteIOContext *pb = s->pb;
50 uint8_t *streaminfo;
51 enum FLACExtradataFormat format;
52 int64_t file_size;
53
54 if (!ff_flac_is_extradata_valid(s->streams[0]->codec, &format, &streaminfo))
55 return -1;
56
57 if (!url_is_streamed(pb)) {
58 /* rewrite the STREAMINFO header block data */
59 file_size = url_ftell(pb);
60 url_fseek(pb, 8, SEEK_SET);
61 put_buffer(pb, streaminfo, FLAC_STREAMINFO_SIZE);
62 url_fseek(pb, file_size, SEEK_SET);
63 put_flush_packet(pb);
64 } else {
65 av_log(s, AV_LOG_WARNING, "unable to rewrite FLAC header.\n");
66 }
67 return 0;
68 }
69
70 static int flac_write_packet(struct AVFormatContext *s, AVPacket *pkt)
71 {
72 put_buffer(s->pb, pkt->data, pkt->size);
73 put_flush_packet(s->pb);
74 return 0;
75 }
76
77 AVOutputFormat flac_muxer = {
78 "flac",
79 NULL_IF_CONFIG_SMALL("raw FLAC"),
80 "audio/x-flac",
81 "flac",
82 0,
83 CODEC_ID_FLAC,
84 CODEC_ID_NONE,
85 flac_write_header,
86 flac_write_packet,
87 flac_write_trailer,
88 .flags= AVFMT_NOTIMESTAMPS,
89 };