/*
  * raw FLAC muxer
  * Copyright (c) 2006-2009 Justin Ruggles
  *
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
  * FFmpeg is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 

 #include "libavcodec/flac.h"

 #include "avformat.h"

 #include "flacenc.h"

 #include "vorbiscomment.h"
 #include "libavcodec/bytestream.h"

 static int flac_write_block_padding(AVIOContext *pb, unsigned int n_padding_bytes,

                                     int last_block)
 {

     avio_w8(pb, last_block ? 0x81 : 0x01);
     avio_wb24(pb, n_padding_bytes);

     while (n_padding_bytes > 0) {

         avio_w8(pb, 0);

         n_padding_bytes--;
     }
     return 0;
 }
 

 static int flac_write_block_comment(AVIOContext *pb, AVDictionary **m,

                                     int last_block, int bitexact)
 {
     const char *vendor = bitexact ? "ffmpeg" : LIBAVFORMAT_IDENT;
     unsigned int len, count;
     uint8_t *p, *p0;
 

     ff_metadata_conv(m, ff_vorbiscomment_metadata_conv, NULL);
 

     len = ff_vorbiscomment_length(*m, vendor, &count);

     p0 = av_malloc(len+4);
     if (!p0)
         return AVERROR(ENOMEM);
     p = p0;
 
     bytestream_put_byte(&p, last_block ? 0x84 : 0x04);
     bytestream_put_be24(&p, len);
     ff_vorbiscomment_write(&p, m, vendor, count);
 

     avio_write(pb, p0, len+4);

     av_freep(&p0);
     p = NULL;
 
     return 0;
 }
 

 static int flac_write_header(struct AVFormatContext *s)
 {

     int ret;
     AVCodecContext *codec = s->streams[0]->codec;
 
     ret = ff_flac_write_header(s->pb, codec, 0);
     if (ret)
         return ret;
 

     ret = flac_write_block_comment(s->pb, &s->metadata, 0,

                                    codec->flags & CODEC_FLAG_BITEXACT);
     if (ret)
         return ret;
 
     /* The command line flac encoder defaults to placing a seekpoint
      * every 10s.  So one might add padding to allow that later
      * but there seems to be no simple way to get the duration here.
      * So let's try the flac default of 8192 bytes */
     flac_write_block_padding(s->pb, 8192, 1);
 
     return ret;

 }
 

 static int flac_write_trailer(struct AVFormatContext *s)
 {

     AVIOContext *pb = s->pb;

     uint8_t *streaminfo;
     enum FLACExtradataFormat format;

     int64_t file_size;
 

     if (!ff_flac_is_extradata_valid(s->streams[0]->codec, &format, &streaminfo))
         return -1;
 

     if (pb->seekable) {

         /* rewrite the STREAMINFO header block data */

         file_size = avio_tell(pb);

         avio_seek(pb, 8, SEEK_SET);

         avio_write(pb, streaminfo, FLAC_STREAMINFO_SIZE);

         avio_seek(pb, file_size, SEEK_SET);

         avio_flush(pb);

     } else {
         av_log(s, AV_LOG_WARNING, "unable to rewrite FLAC header.\n");

     }
     return 0;
 }
 
 static int flac_write_packet(struct AVFormatContext *s, AVPacket *pkt)
 {

     avio_write(s->pb, pkt->data, pkt->size);

     avio_flush(s->pb);

     return 0;
 }
 

 AVOutputFormat ff_flac_muxer = {

     "flac",
     NULL_IF_CONFIG_SMALL("raw FLAC"),
     "audio/x-flac",
     "flac",
     0,
     CODEC_ID_FLAC,
     CODEC_ID_NONE,
     flac_write_header,
     flac_write_packet,
     flac_write_trailer,
     .flags= AVFMT_NOTIMESTAMPS,
 };