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Description

Usage

$bool = getid3_ogg::ParseVorbisPageHeader( $filedata, $filedataoffset, $oggpageinfo );

Parameters

$filedata

( string ) required –

$filedataoffset

( int ) required –

$oggpageinfo

( array ) required –

Returns

bool

Source

File name: wordpress/wp-includes/ID3/module.audio.ogg.php
Lines:

  public function ParseVorbisPageHeader(&$filedata, &$filedataoffset, &$oggpageinfo) {
    $info = &$this->getid3->info;
    $info['audio']['dataformat'] = 'vorbis';
    $info['audio']['lossless']   = false;

    $info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['packet_type'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 1));
    $filedataoffset += 1;
    $info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['stream_type'] = substr($filedata, $filedataoffset, 6); // hard-coded to 'vorbis'
    $filedataoffset += 6;
    $info['ogg']['bitstreamversion'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
    $filedataoffset += 4;
    $info['ogg']['numberofchannels'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 1));
    $filedataoffset += 1;
    $info['audio']['channels']       = $info['ogg']['numberofchannels'];
    $info['ogg']['samplerate']       = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
    $filedataoffset += 4;
    if ($info['ogg']['samplerate'] == 0) {
      $this->error('Corrupt Ogg file: sample rate == zero');
      return false;
    }
    $info['audio']['sample_rate']    = $info['ogg']['samplerate'];
    $info['ogg']['samples']          = 0; // filled in later
    $info['ogg']['bitrate_average']  = 0; // filled in later
    $info['ogg']['bitrate_max']      = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
    $filedataoffset += 4;
    $info['ogg']['bitrate_nominal']  = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
    $filedataoffset += 4;
    $info['ogg']['bitrate_min']      = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
    $filedataoffset += 4;
    $info['ogg']['blocksize_small']  = pow(2,  getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 1)) & 0x0F);
    $info['ogg']['blocksize_large']  = pow(2, (getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 1)) & 0xF0) >> 4);
    $info['ogg']['stop_bit']         = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 1)); // must be 1, marks end of packet

    $info['audio']['bitrate_mode'] = 'vbr'; // overridden if actually abr
    if ($info['ogg']['bitrate_max'] == 0xFFFFFFFF) {
      unset($info['ogg']['bitrate_max']);
      $info['audio']['bitrate_mode'] = 'abr';
    }
    if ($info['ogg']['bitrate_nominal'] == 0xFFFFFFFF) {
      unset($info['ogg']['bitrate_nominal']);
    }
    if ($info['ogg']['bitrate_min'] == 0xFFFFFFFF) {
      unset($info['ogg']['bitrate_min']);
      $info['audio']['bitrate_mode'] = 'abr';
    }
    return true;
  }
 

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