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#include "flacenc.h"
25
26int ff_flac_write_header(ByteIOContext *pb, AVCodecContext *codec)
27{
28    static const uint8_t header[8] = {
29        0x66, 0x4C, 0x61, 0x43, 0x80, 0x00, 0x00, 0x22
30    };
31    uint8_t *streaminfo;
32    enum FLACExtradataFormat format;
33
34    if (!ff_flac_is_extradata_valid(codec, &format, &streaminfo))
35        return -1;
36
37    /* write "fLaC" stream marker and first metadata block header if needed */
38    if (format == FLAC_EXTRADATA_FORMAT_STREAMINFO) {
39        put_buffer(pb, header, 8);
40    }
41
42    /* write STREAMINFO or full header */
43    put_buffer(pb, codec->extradata, codec->extradata_size);
44
45    return 0;
46}
47
48static int flac_write_header(struct AVFormatContext *s)
49{
50    return ff_flac_write_header(s->pb, s->streams[0]->codec);
51}
52
53static int flac_write_trailer(struct AVFormatContext *s)
54{
55    ByteIOContext *pb = s->pb;
56    uint8_t *streaminfo;
57    enum FLACExtradataFormat format;
58    int64_t file_size;
59
60    if (!ff_flac_is_extradata_valid(s->streams[0]->codec, &format, &streaminfo))
61        return -1;
62
63    if (!url_is_streamed(pb)) {
64        /* rewrite the STREAMINFO header block data */
65        file_size = url_ftell(pb);
66        url_fseek(pb, 8, SEEK_SET);
67        put_buffer(pb, streaminfo, FLAC_STREAMINFO_SIZE);
68        url_fseek(pb, file_size, SEEK_SET);
69        put_flush_packet(pb);
70    } else {
71        av_log(s, AV_LOG_WARNING, "unable to rewrite FLAC header.\n");
72    }
73    return 0;
74}
75
76static int flac_write_packet(struct AVFormatContext *s, AVPacket *pkt)
77{
78    put_buffer(s->pb, pkt->data, pkt->size);
79    put_flush_packet(s->pb);
80    return 0;
81}
82
83AVOutputFormat flac_muxer = {
84    "flac",
85    NULL_IF_CONFIG_SMALL("raw FLAC"),
86    "audio/x-flac",
87    "flac",
88    0,
89    CODEC_ID_FLAC,
90    CODEC_ID_NONE,
91    flac_write_header,
92    flac_write_packet,
93    flac_write_trailer,
94    .flags= AVFMT_NOTIMESTAMPS,
95};
96