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     enum FLACExtradataFormat format;
  33
  34     if (!ff_flac_is_extradata_valid(codec, &format, &streaminfo))
  35         return -1;
  36
  37     if (format == FLAC_EXTRADATA_FORMAT_STREAMINFO) {
  38         put_buffer(s->pb, header, 8);
  39     }
  40
  41     /* write STREAMINFO or full header */
  42     put_buffer(s->pb, codec->extradata, codec->extradata_size);
  43
  44     return 0;
  45 }
  46
  47 static int flac_write_trailer(struct AVFormatContext *s)
  48 {
  49     ByteIOContext *pb = s->pb;
  50     uint8_t *streaminfo;
  51     enum FLACExtradataFormat format;
  52     int64_t file_size;
  53
  54     if (!ff_flac_is_extradata_valid(s->streams[0]->codec, &format, &streaminfo))
  55         return -1;
  56
  57     if (!url_is_streamed(pb)) {
  58         /* rewrite the STREAMINFO header block data */
  59         file_size = url_ftell(pb);
  60         url_fseek(pb, 8, SEEK_SET);
  61         put_buffer(pb, streaminfo, FLAC_STREAMINFO_SIZE);
  62         url_fseek(pb, file_size, SEEK_SET);
  63         put_flush_packet(pb);
  64     } else {
  65         av_log(s, AV_LOG_WARNING, "unable to rewrite FLAC header.\n");
  66     }
  67     return 0;
  68 }
  69
  70 static int flac_write_packet(struct AVFormatContext *s, AVPacket *pkt)
  71 {
  72     put_buffer(s->pb, pkt->data, pkt->size);
  73     put_flush_packet(s->pb);
  74     return 0;
  75 }
  76
  77 AVOutputFormat flac_muxer = {
  78     "flac",
  79     NULL_IF_CONFIG_SMALL("raw FLAC"),
  80     "audio/x-flac",
  81     "flac",
  82     0,
  83     CODEC_ID_FLAC,
  84     CODEC_ID_NONE,
  85     flac_write_header,
  86     flac_write_packet,
  87     flac_write_trailer,
  88     .flags= AVFMT_NOTIMESTAMPS,
  89 };