/*
  *    Copyright (C) 2005  Matthieu CASTET

  *

  * 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 <stdlib.h>

 #include "libavcodec/get_bits.h"

 #include "libavcodec/flac.h"

 #include "avformat.h"

 #include "internal.h"

 #include "oggdec.h"

 #define OGG_FLAC_METADATA_TYPE_STREAMINFO 0x7F

 
 static int
 flac_header (AVFormatContext * s, int idx)
 {

     struct ogg *ogg = s->priv_data;
     struct ogg_stream *os = ogg->streams + idx;

     AVStream *st = s->streams[idx];
     GetBitContext gb;
     int mdt;
 
     if (os->buf[os->pstart] == 0xff)
         return 0;
 
     init_get_bits(&gb, os->buf + os->pstart, os->psize*8);

     skip_bits1(&gb); /* metadata_last */

     mdt = get_bits(&gb, 7);
 

     if (mdt == OGG_FLAC_METADATA_TYPE_STREAMINFO) {
         uint8_t *streaminfo_start = os->buf + os->pstart + 5 + 4 + 4 + 4;

         uint32_t samplerate;
 

         skip_bits_long(&gb, 4*8); /* "FLAC" */

         if(get_bits(&gb, 8) != 1) /* unsupported major version */
             return -1;

         skip_bits_long(&gb, 8 + 16); /* minor version + header count */
         skip_bits_long(&gb, 4*8); /* "fLaC" */

         /* METADATA_BLOCK_HEADER */

         if (get_bits_long(&gb, 32) != FLAC_STREAMINFO_SIZE)

             return -1;
 

         st->codec->codec_type = AVMEDIA_TYPE_AUDIO;

         st->codec->codec_id = AV_CODEC_ID_FLAC;

         st->need_parsing = AVSTREAM_PARSE_HEADERS;

         if (ff_alloc_extradata(st->codec, FLAC_STREAMINFO_SIZE) < 0)
             return AVERROR(ENOMEM);

         memcpy(st->codec->extradata, streaminfo_start, st->codec->extradata_size);

         samplerate = AV_RB24(st->codec->extradata + 10) >> 4;
         if (!samplerate)
             return AVERROR_INVALIDDATA;
 
         avpriv_set_pts_info(st, 64, 1, samplerate);

     } else if (mdt == FLAC_METADATA_TYPE_VORBIS_COMMENT) {

         ff_vorbis_stream_comment(s, st, os->buf + os->pstart + 4, os->psize - 4);

     }
 
     return 1;
 }
 

 static int
 old_flac_header (AVFormatContext * s, int idx)
 {

     struct ogg *ogg = s->priv_data;

     AVStream *st = s->streams[idx];

     struct ogg_stream *os = ogg->streams + idx;
     AVCodecParserContext *parser = av_parser_init(AV_CODEC_ID_FLAC);
     int size;
     uint8_t *data;
 
     if (!parser)
         return -1;
 

     st->codec->codec_type = AVMEDIA_TYPE_AUDIO;

     st->codec->codec_id = AV_CODEC_ID_FLAC;

     parser->flags = PARSER_FLAG_COMPLETE_FRAMES;
     av_parser_parse2(parser, st->codec,
                      &data, &size, os->buf + os->pstart, os->psize,
                      AV_NOPTS_VALUE, AV_NOPTS_VALUE, -1);
 
     av_parser_close(parser);
 
     if (st->codec->sample_rate) {
         avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
         return 0;
     }
 
     return 1;

 }
 

 const struct ogg_codec ff_flac_codec = {

     .magic = "\177FLAC",
     .magicsize = 5,

     .header = flac_header,
     .nb_header = 2,

 };

 const struct ogg_codec ff_old_flac_codec = {

     .magic = "fLaC",
     .magicsize = 4,

     .header = old_flac_header,
     .nb_header = 0,

 };