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