3 * Copyright (c) 2006-2009 Justin Ruggles
5 * This file is part of FFmpeg.
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.
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.
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
22 #include "libavcodec/flac.h"
26 #include "vorbiscomment.h"
27 #include "libavcodec/bytestream.h"
30 static int flac_write_block_padding(AVIOContext *pb, unsigned int n_padding_bytes,
33 avio_w8(pb, last_block ? 0x81 : 0x01);
34 avio_wb24(pb, n_padding_bytes);
35 while (n_padding_bytes > 0) {
42 static int flac_write_block_comment(AVIOContext *pb, AVMetadata **m,
43 int last_block, int bitexact)
45 const char *vendor = bitexact ? "ffmpeg" : LIBAVFORMAT_IDENT;
46 unsigned int len, count;
49 ff_metadata_conv(m, ff_vorbiscomment_metadata_conv, NULL);
51 len = ff_vorbiscomment_length(*m, vendor, &count);
52 p0 = av_malloc(len+4);
54 return AVERROR(ENOMEM);
57 bytestream_put_byte(&p, last_block ? 0x84 : 0x04);
58 bytestream_put_be24(&p, len);
59 ff_vorbiscomment_write(&p, m, vendor, count);
61 avio_write(pb, p0, len+4);
68 static int flac_write_header(struct AVFormatContext *s)
71 AVCodecContext *codec = s->streams[0]->codec;
73 ret = ff_flac_write_header(s->pb, codec, 0);
77 ret = flac_write_block_comment(s->pb, &s->metadata, 0,
78 codec->flags & CODEC_FLAG_BITEXACT);
82 /* The command line flac encoder defaults to placing a seekpoint
83 * every 10s. So one might add padding to allow that later
84 * but there seems to be no simple way to get the duration here.
85 * So let's try the flac default of 8192 bytes */
86 flac_write_block_padding(s->pb, 8192, 1);
91 static int flac_write_trailer(struct AVFormatContext *s)
93 AVIOContext *pb = s->pb;
95 enum FLACExtradataFormat format;
98 if (!ff_flac_is_extradata_valid(s->streams[0]->codec, &format, &streaminfo))
101 if (!url_is_streamed(pb)) {
102 /* rewrite the STREAMINFO header block data */
103 file_size = url_ftell(pb);
104 url_fseek(pb, 8, SEEK_SET);
105 avio_write(pb, streaminfo, FLAC_STREAMINFO_SIZE);
106 url_fseek(pb, file_size, SEEK_SET);
107 put_flush_packet(pb);
109 av_log(s, AV_LOG_WARNING, "unable to rewrite FLAC header.\n");
114 static int flac_write_packet(struct AVFormatContext *s, AVPacket *pkt)
116 avio_write(s->pb, pkt->data, pkt->size);
117 put_flush_packet(s->pb);
121 AVOutputFormat ff_flac_muxer = {
123 NULL_IF_CONFIG_SMALL("raw FLAC"),
132 .flags= AVFMT_NOTIMESTAMPS,