libavformat/flacenc.c

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