3 * Copyright (c) 2006-2009 Justin Ruggles
5 * This file is part of Libav.
7 * Libav 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.
12 * Libav 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.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "libavutil/opt.h"
23 #include "libavcodec/flac.h"
26 #include "vorbiscomment.h"
27 #include "libavcodec/bytestream.h"
30 typedef struct FlacMuxerContext {
35 static int flac_write_block_padding(AVIOContext *pb, unsigned int n_padding_bytes,
38 avio_w8(pb, last_block ? 0x81 : 0x01);
39 avio_wb24(pb, n_padding_bytes);
40 while (n_padding_bytes > 0) {
47 static int flac_write_block_comment(AVIOContext *pb, AVDictionary **m,
48 int last_block, int bitexact)
50 const char *vendor = bitexact ? "Libav" : LIBAVFORMAT_IDENT;
51 unsigned int len, count;
54 ff_metadata_conv(m, ff_vorbiscomment_metadata_conv, NULL);
56 len = ff_vorbiscomment_length(*m, vendor, &count);
57 p0 = av_malloc(len+4);
59 return AVERROR(ENOMEM);
62 bytestream_put_byte(&p, last_block ? 0x84 : 0x04);
63 bytestream_put_be24(&p, len);
64 ff_vorbiscomment_write(&p, m, vendor, count);
66 avio_write(pb, p0, len+4);
73 static int flac_write_header(struct AVFormatContext *s)
76 AVCodecContext *codec = s->streams[0]->codec;
77 FlacMuxerContext *c = s->priv_data;
82 ret = ff_flac_write_header(s->pb, codec, 0);
86 ret = flac_write_block_comment(s->pb, &s->metadata, 0,
87 codec->flags & CODEC_FLAG_BITEXACT);
91 /* The command line flac encoder defaults to placing a seekpoint
92 * every 10s. So one might add padding to allow that later
93 * but there seems to be no simple way to get the duration here.
94 * So let's try the flac default of 8192 bytes */
95 flac_write_block_padding(s->pb, 8192, 1);
100 static int flac_write_trailer(struct AVFormatContext *s)
102 AVIOContext *pb = s->pb;
104 enum FLACExtradataFormat format;
106 FlacMuxerContext *c = s->priv_data;
108 if (!c->write_header)
111 if (!avpriv_flac_is_extradata_valid(s->streams[0]->codec, &format, &streaminfo))
115 /* rewrite the STREAMINFO header block data */
116 file_size = avio_tell(pb);
117 avio_seek(pb, 8, SEEK_SET);
118 avio_write(pb, streaminfo, FLAC_STREAMINFO_SIZE);
119 avio_seek(pb, file_size, SEEK_SET);
122 av_log(s, AV_LOG_WARNING, "unable to rewrite FLAC header.\n");
127 static int flac_write_packet(struct AVFormatContext *s, AVPacket *pkt)
129 avio_write(s->pb, pkt->data, pkt->size);
133 static const AVOption flacenc_options[] = {
134 { "write_header", "Write the file header", offsetof(FlacMuxerContext, write_header), AV_OPT_TYPE_INT, {.i64 = 1}, 0, 1, AV_OPT_FLAG_ENCODING_PARAM },
138 static const AVClass flac_muxer_class = {
139 .class_name = "flac muxer",
140 .item_name = av_default_item_name,
141 .option = flacenc_options,
142 .version = LIBAVUTIL_VERSION_INT,
145 AVOutputFormat ff_flac_muxer = {
147 .long_name = NULL_IF_CONFIG_SMALL("raw FLAC"),
148 .priv_data_size = sizeof(FlacMuxerContext),
149 .mime_type = "audio/x-flac",
150 .extensions = "flac",
151 .audio_codec = AV_CODEC_ID_FLAC,
152 .video_codec = AV_CODEC_ID_NONE,
153 .write_header = flac_write_header,
154 .write_packet = flac_write_packet,
155 .write_trailer = flac_write_trailer,
156 .flags = AVFMT_NOTIMESTAMPS,
157 .priv_class = &flac_muxer_class,