diff options
Diffstat (limited to 'modules/getid3/module.audio.aac_adif.php')
| -rw-r--r-- | modules/getid3/module.audio.aac_adif.php | 58 |
1 files changed, 29 insertions, 29 deletions
diff --git a/modules/getid3/module.audio.aac_adif.php b/modules/getid3/module.audio.aac_adif.php index 8f1a6853..9b2f72b6 100644 --- a/modules/getid3/module.audio.aac_adif.php +++ b/modules/getid3/module.audio.aac_adif.php @@ -22,14 +22,14 @@ //
// $Id: module.audio.aac_adif.php,v 1.3 2006/11/02 10:48:00 ah Exp $ - - + + class getid3_aac_adif extends getid3_handler { public function Analyze() { - $getid3 = $this->getid3; + $getid3 = $this->getid3; // http://faac.sourceforge.net/wiki/index.php?page=ADIF // http://libmpeg.org/mpeg4/doc/w2203tfs.pdf @@ -49,19 +49,19 @@ class getid3_aac_adif extends getid3_handler // program_config_element() // } // } - + $getid3->info['fileformat'] = 'aac'; $getid3->info['audio']['dataformat'] = 'aac'; $getid3->info['audio']['lossless'] = false; - + $getid3->info['aac']['header'] = array () ; $info_aac = &$getid3->info['aac']; $info_aac_header = & $info_aac['header']; fseek($getid3->fp, $getid3->info['avdataoffset'], SEEK_SET); $aac_header_bitstream = getid3_lib::BigEndian2Bin(fread($getid3->fp, 1024)); - + $info_aac['header_type'] = 'ADIF'; $info_aac_header['mpeg_version'] = 4; $bit_offset = 32; @@ -71,7 +71,7 @@ class getid3_aac_adif extends getid3_handler $info_aac_header['copyright_id'] = getid3_aac_adif::Bin2String(substr($aac_header_bitstream, $bit_offset, 72)); $bit_offset += 72; } - + $info_aac_header['original_copy'] = $aac_header_bitstream{$bit_offset++} == '1'; $info_aac_header['home'] = $aac_header_bitstream{$bit_offset++} == '1'; $info_aac_header['is_vbr'] = $aac_header_bitstream{$bit_offset++} == '1'; @@ -80,14 +80,14 @@ class getid3_aac_adif extends getid3_handler $getid3->info['audio']['bitrate_mode'] = 'vbr'; $info_aac_header['bitrate_max'] = bindec(substr($aac_header_bitstream, $bit_offset, 23)); $bit_offset += 23; - } + } else { $getid3->info['audio']['bitrate_mode'] = 'cbr'; $info_aac_header['bitrate'] = bindec(substr($aac_header_bitstream, $bit_offset, 23)); $bit_offset += 23; $getid3->info['audio']['bitrate'] = $info_aac_header['bitrate']; } - + $info_aac_header['num_program_configs'] = 1 + bindec(substr($aac_header_bitstream, $bit_offset, 4)); $bit_offset += 4; @@ -140,7 +140,7 @@ class getid3_aac_adif extends getid3_handler // for (i = 0; i < comment_field_bytes; i++) { // comment_field_data[i] 8 // } - + $info_aac['program_configs'][$i] = array (); $info_aac_program_configs_i = &$info_aac['program_configs'][$i]; @@ -148,7 +148,7 @@ class getid3_aac_adif extends getid3_handler $info_aac_program_configs_i['buffer_fullness'] = bindec(substr($aac_header_bitstream, $bit_offset, 20)); $bit_offset += 20; } - + $info_aac_program_configs_i['element_instance_tag'] = bindec(substr($aac_header_bitstream, $bit_offset, 4)); $info_aac_program_configs_i['object_type'] = bindec(substr($aac_header_bitstream, $bit_offset + 4, 2)); $info_aac_program_configs_i['sampling_frequency_index'] = bindec(substr($aac_header_bitstream, $bit_offset + 6, 4)); @@ -159,26 +159,26 @@ class getid3_aac_adif extends getid3_handler $info_aac_program_configs_i['num_assoc_data_elements'] = bindec(substr($aac_header_bitstream, $bit_offset + 24, 3)); $info_aac_program_configs_i['num_valid_cc_elements'] = bindec(substr($aac_header_bitstream, $bit_offset + 27, 4)); $bit_offset += 31; - + $info_aac_program_configs_i['mono_mixdown_present'] = $aac_header_bitstream{$bit_offset++} == 1; if ($info_aac_program_configs_i['mono_mixdown_present']) { $info_aac_program_configs_i['mono_mixdown_element_number'] = bindec(substr($aac_header_bitstream, $bit_offset, 4)); $bit_offset += 4; } - + $info_aac_program_configs_i['stereo_mixdown_present'] = $aac_header_bitstream{$bit_offset++} == 1; if ($info_aac_program_configs_i['stereo_mixdown_present']) { $info_aac_program_configs_i['stereo_mixdown_element_number'] = bindec(substr($aac_header_bitstream, $bit_offset, 4)); $bit_offset += 4; } - + $info_aac_program_configs_i['matrix_mixdown_idx_present'] = $aac_header_bitstream{$bit_offset++} == 1; if ($info_aac_program_configs_i['matrix_mixdown_idx_present']) { $info_aac_program_configs_i['matrix_mixdown_idx'] = bindec(substr($aac_header_bitstream, $bit_offset, 2)); $bit_offset += 2; $info_aac_program_configs_i['pseudo_surround_enable'] = $aac_header_bitstream{$bit_offset++} == 1; } - + for ($j = 0; $j < $info_aac_program_configs_i['num_front_channel_elements']; $j++) { $info_aac_program_configs_i['front_element_is_cpe'][$j] = $aac_header_bitstream{$bit_offset++} == 1; $info_aac_program_configs_i['front_element_tag_select'][$j] = bindec(substr($aac_header_bitstream, $bit_offset, 4)); @@ -212,19 +212,19 @@ class getid3_aac_adif extends getid3_handler $info_aac_program_configs_i['comment_field_bytes'] = bindec(substr($aac_header_bitstream, $bit_offset, 8)); $bit_offset += 8; - + $info_aac_program_configs_i['comment_field'] = getid3_aac_adif::Bin2String(substr($aac_header_bitstream, $bit_offset, 8 * $info_aac_program_configs_i['comment_field_bytes'])); $bit_offset += 8 * $info_aac_program_configs_i['comment_field_bytes']; $info_aac_header['profile_text'] = getid3_aac_adif::AACprofileLookup($info_aac_program_configs_i['object_type'], $info_aac_header['mpeg_version']); $info_aac_program_configs_i['sampling_frequency'] = $getid3->info['audio']['sample_rate'] = getid3_aac_adif::AACsampleRateLookup($info_aac_program_configs_i['sampling_frequency_index']); $getid3->info['audio']['channels'] = getid3_aac_adif::AACchannelCountCalculate($info_aac_program_configs_i); - + if ($info_aac_program_configs_i['comment_field']) { $info_aac['comments'][] = $info_aac_program_configs_i['comment_field']; } } - + $getid3->info['playtime_seconds'] = (($getid3->info['avdataend'] - $getid3->info['avdataoffset']) * 8) / $getid3->info['audio']['bitrate']; $getid3->info['audio']['encoder_options'] = $info_aac['header_type'].' '.$info_aac_header['profile_text']; @@ -242,11 +242,11 @@ class getid3_aac_adif extends getid3_handler } return $string; } - - - + + + public static function AACsampleRateLookup($samplerate_id) { - + static $lookup = array ( 0 => 96000, 1 => 88200, @@ -271,14 +271,14 @@ class getid3_aac_adif extends getid3_handler public static function AACprofileLookup($profile_id, $mpeg_version) { - + static $lookup = array ( - 2 => array ( + 2 => array ( 0 => 'Main profile', 1 => 'Low Complexity profile (LC)', 2 => 'Scalable Sample Rate profile (SSR)', 3 => '(reserved)' - ), + ), 4 => array ( 0 => 'AAC_MAIN', 1 => 'AAC_LC', @@ -292,17 +292,17 @@ class getid3_aac_adif extends getid3_handler public static function AACchannelCountCalculate($program_configs) { - + $channels = 0; - + foreach (array ('front', 'side', 'back') as $placement) { for ($i = 0; $i < $program_configs['num_'.$placement.'_channel_elements']; $i++) { - + // Each element is channel pair (CPE = Channel Pair Element) $channels += 1 + ($program_configs[$placement.'_element_is_cpe'][$i] ? 1 : 0); } } - + return $channels + $program_configs['num_lfe_channel_elements']; } |