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96 lines
2.7 KiB
C
96 lines
2.7 KiB
C
/*
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* raw FLAC muxer
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* Copyright (c) 2006-2009 Justin Ruggles
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavcodec/flac.h"
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#include "avformat.h"
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#include "flacenc.h"
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int ff_flac_write_header(ByteIOContext *pb, AVCodecContext *codec)
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{
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static const uint8_t header[8] = {
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0x66, 0x4C, 0x61, 0x43, 0x80, 0x00, 0x00, 0x22
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};
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uint8_t *streaminfo;
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enum FLACExtradataFormat format;
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if (!ff_flac_is_extradata_valid(codec, &format, &streaminfo))
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return -1;
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/* write "fLaC" stream marker and first metadata block header if needed */
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if (format == FLAC_EXTRADATA_FORMAT_STREAMINFO) {
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put_buffer(pb, header, 8);
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}
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/* write STREAMINFO or full header */
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put_buffer(pb, codec->extradata, codec->extradata_size);
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return 0;
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}
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static int flac_write_header(struct AVFormatContext *s)
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{
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return ff_flac_write_header(s->pb, s->streams[0]->codec);
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}
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static int flac_write_trailer(struct AVFormatContext *s)
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{
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ByteIOContext *pb = s->pb;
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uint8_t *streaminfo;
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enum FLACExtradataFormat format;
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int64_t file_size;
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if (!ff_flac_is_extradata_valid(s->streams[0]->codec, &format, &streaminfo))
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return -1;
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if (!url_is_streamed(pb)) {
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/* rewrite the STREAMINFO header block data */
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file_size = url_ftell(pb);
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url_fseek(pb, 8, SEEK_SET);
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put_buffer(pb, streaminfo, FLAC_STREAMINFO_SIZE);
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url_fseek(pb, file_size, SEEK_SET);
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put_flush_packet(pb);
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} else {
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av_log(s, AV_LOG_WARNING, "unable to rewrite FLAC header.\n");
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}
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return 0;
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}
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static int flac_write_packet(struct AVFormatContext *s, AVPacket *pkt)
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{
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put_buffer(s->pb, pkt->data, pkt->size);
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put_flush_packet(s->pb);
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return 0;
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}
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AVOutputFormat flac_muxer = {
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"flac",
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NULL_IF_CONFIG_SMALL("raw FLAC"),
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"audio/x-flac",
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"flac",
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0,
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CODEC_ID_FLAC,
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CODEC_ID_NONE,
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flac_write_header,
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flac_write_packet,
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flac_write_trailer,
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.flags= AVFMT_NOTIMESTAMPS,
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};
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