diff options
Diffstat (limited to 'getid3/module.audio.aac.php')
| -rw-r--r-- | getid3/module.audio.aac.php | 542 |
1 files changed, 0 insertions, 542 deletions
diff --git a/getid3/module.audio.aac.php b/getid3/module.audio.aac.php deleted file mode 100644 index 7ab3e99..0000000 --- a/getid3/module.audio.aac.php +++ /dev/null @@ -1,542 +0,0 @@ -<?php -///////////////////////////////////////////////////////////////// -/// getID3() by James Heinrich <info@getid3.org> // -// available at http://getid3.sourceforge.net // -// or http://www.getid3.org // -///////////////////////////////////////////////////////////////// -// See readme.txt for more details // -///////////////////////////////////////////////////////////////// -// // -// module.audio.aac.php // -// module for analyzing AAC Audio files // -// dependencies: NONE // -// /// -///////////////////////////////////////////////////////////////// - - -class getid3_aac -{ - - // new combined constructor - function getid3_aac(&$fd, &$ThisFileInfo, $option) { - - if ($option === 'adif') { - $this->getAACADIFheaderFilepointer($fd, $ThisFileInfo); - } - elseif ($option === 'adts') { - $this->getAACADTSheaderFilepointer($fd, $ThisFileInfo); - } - } - - - - function getAACADIFheaderFilepointer(&$fd, &$ThisFileInfo) { - $ThisFileInfo['fileformat'] = 'aac'; - $ThisFileInfo['audio']['dataformat'] = 'aac'; - $ThisFileInfo['audio']['lossless'] = false; - - fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET); - $AACheader = fread($fd, 1024); - $offset = 0; - - if (substr($AACheader, 0, 4) == 'ADIF') { - - // http://faac.sourceforge.net/wiki/index.php?page=ADIF - - // http://libmpeg.org/mpeg4/doc/w2203tfs.pdf - // adif_header() { - // adif_id 32 - // copyright_id_present 1 - // if( copyright_id_present ) - // copyright_id 72 - // original_copy 1 - // home 1 - // bitstream_type 1 - // bitrate 23 - // num_program_config_elements 4 - // for (i = 0; i < num_program_config_elements + 1; i++ ) { - // if( bitstream_type == '0' ) - // adif_buffer_fullness 20 - // program_config_element() - // } - // } - - $AACheaderBitstream = getid3_lib::BigEndian2Bin($AACheader); - $bitoffset = 0; - - $ThisFileInfo['aac']['header_type'] = 'ADIF'; - $bitoffset += 32; - $ThisFileInfo['aac']['header']['mpeg_version'] = 4; - - $ThisFileInfo['aac']['header']['copyright'] = (bool) (substr($AACheaderBitstream, $bitoffset, 1) == '1'); - $bitoffset += 1; - if ($ThisFileInfo['aac']['header']['copyright']) { - $ThisFileInfo['aac']['header']['copyright_id'] = getid3_lib::Bin2String(substr($AACheaderBitstream, $bitoffset, 72)); - $bitoffset += 72; - } - $ThisFileInfo['aac']['header']['original_copy'] = (bool) (substr($AACheaderBitstream, $bitoffset, 1) == '1'); - $bitoffset += 1; - $ThisFileInfo['aac']['header']['home'] = (bool) (substr($AACheaderBitstream, $bitoffset, 1) == '1'); - $bitoffset += 1; - $ThisFileInfo['aac']['header']['is_vbr'] = (bool) (substr($AACheaderBitstream, $bitoffset, 1) == '1'); - $bitoffset += 1; - if ($ThisFileInfo['aac']['header']['is_vbr']) { - $ThisFileInfo['audio']['bitrate_mode'] = 'vbr'; - $ThisFileInfo['aac']['header']['bitrate_max'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 23)); - $bitoffset += 23; - } else { - $ThisFileInfo['audio']['bitrate_mode'] = 'cbr'; - $ThisFileInfo['aac']['header']['bitrate'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 23)); - $bitoffset += 23; - $ThisFileInfo['audio']['bitrate'] = $ThisFileInfo['aac']['header']['bitrate']; - } - if ($ThisFileInfo['audio']['bitrate'] == 0) { - $ThisFileInfo['error'][] = 'Corrupt AAC file: bitrate_audio == zero'; - return false; - } - $ThisFileInfo['aac']['header']['num_program_configs'] = 1 + getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4)); - $bitoffset += 4; - - for ($i = 0; $i < $ThisFileInfo['aac']['header']['num_program_configs']; $i++) { - // http://www.audiocoding.com/wiki/index.php?page=program_config_element - - // buffer_fullness 20 - - // element_instance_tag 4 - // object_type 2 - // sampling_frequency_index 4 - // num_front_channel_elements 4 - // num_side_channel_elements 4 - // num_back_channel_elements 4 - // num_lfe_channel_elements 2 - // num_assoc_data_elements 3 - // num_valid_cc_elements 4 - // mono_mixdown_present 1 - // mono_mixdown_element_number 4 if mono_mixdown_present == 1 - // stereo_mixdown_present 1 - // stereo_mixdown_element_number 4 if stereo_mixdown_present == 1 - // matrix_mixdown_idx_present 1 - // matrix_mixdown_idx 2 if matrix_mixdown_idx_present == 1 - // pseudo_surround_enable 1 if matrix_mixdown_idx_present == 1 - // for (i = 0; i < num_front_channel_elements; i++) { - // front_element_is_cpe[i] 1 - // front_element_tag_select[i] 4 - // } - // for (i = 0; i < num_side_channel_elements; i++) { - // side_element_is_cpe[i] 1 - // side_element_tag_select[i] 4 - // } - // for (i = 0; i < num_back_channel_elements; i++) { - // back_element_is_cpe[i] 1 - // back_element_tag_select[i] 4 - // } - // for (i = 0; i < num_lfe_channel_elements; i++) { - // lfe_element_tag_select[i] 4 - // } - // for (i = 0; i < num_assoc_data_elements; i++) { - // assoc_data_element_tag_select[i] 4 - // } - // for (i = 0; i < num_valid_cc_elements; i++) { - // cc_element_is_ind_sw[i] 1 - // valid_cc_element_tag_select[i] 4 - // } - // byte_alignment() VAR - // comment_field_bytes 8 - // for (i = 0; i < comment_field_bytes; i++) { - // comment_field_data[i] 8 - // } - - if (!$ThisFileInfo['aac']['header']['is_vbr']) { - $ThisFileInfo['aac']['program_configs'][$i]['buffer_fullness'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 20)); - $bitoffset += 20; - } - $ThisFileInfo['aac']['program_configs'][$i]['element_instance_tag'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4)); - $bitoffset += 4; - $ThisFileInfo['aac']['program_configs'][$i]['object_type'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 2)); - $bitoffset += 2; - $ThisFileInfo['aac']['program_configs'][$i]['sampling_frequency_index'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4)); - $bitoffset += 4; - $ThisFileInfo['aac']['program_configs'][$i]['num_front_channel_elements'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4)); - $bitoffset += 4; - $ThisFileInfo['aac']['program_configs'][$i]['num_side_channel_elements'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4)); - $bitoffset += 4; - $ThisFileInfo['aac']['program_configs'][$i]['num_back_channel_elements'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4)); - $bitoffset += 4; - $ThisFileInfo['aac']['program_configs'][$i]['num_lfe_channel_elements'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 2)); - $bitoffset += 2; - $ThisFileInfo['aac']['program_configs'][$i]['num_assoc_data_elements'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 3)); - $bitoffset += 3; - $ThisFileInfo['aac']['program_configs'][$i]['num_valid_cc_elements'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4)); - $bitoffset += 4; - $ThisFileInfo['aac']['program_configs'][$i]['mono_mixdown_present'] = (bool) getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 1)); - $bitoffset += 1; - if ($ThisFileInfo['aac']['program_configs'][$i]['mono_mixdown_present']) { - $ThisFileInfo['aac']['program_configs'][$i]['mono_mixdown_element_number'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4)); - $bitoffset += 4; - } - $ThisFileInfo['aac']['program_configs'][$i]['stereo_mixdown_present'] = (bool) getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 1)); - $bitoffset += 1; - if ($ThisFileInfo['aac']['program_configs'][$i]['stereo_mixdown_present']) { - $ThisFileInfo['aac']['program_configs'][$i]['stereo_mixdown_element_number'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4)); - $bitoffset += 4; - } - $ThisFileInfo['aac']['program_configs'][$i]['matrix_mixdown_idx_present'] = (bool) getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 1)); - $bitoffset += 1; - if ($ThisFileInfo['aac']['program_configs'][$i]['matrix_mixdown_idx_present']) { - $ThisFileInfo['aac']['program_configs'][$i]['matrix_mixdown_idx'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 2)); - $bitoffset += 2; - $ThisFileInfo['aac']['program_configs'][$i]['pseudo_surround_enable'] = (bool) getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 1)); - $bitoffset += 1; - } - for ($j = 0; $j < $ThisFileInfo['aac']['program_configs'][$i]['num_front_channel_elements']; $j++) { - $ThisFileInfo['aac']['program_configs'][$i]['front_element_is_cpe'][$j] = (bool) getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 1)); - $bitoffset += 1; - $ThisFileInfo['aac']['program_configs'][$i]['front_element_tag_select'][$j] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4)); - $bitoffset += 4; - } - for ($j = 0; $j < $ThisFileInfo['aac']['program_configs'][$i]['num_side_channel_elements']; $j++) { - $ThisFileInfo['aac']['program_configs'][$i]['side_element_is_cpe'][$j] = (bool) getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 1)); - $bitoffset += 1; - $ThisFileInfo['aac']['program_configs'][$i]['side_element_tag_select'][$j] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4)); - $bitoffset += 4; - } - for ($j = 0; $j < $ThisFileInfo['aac']['program_configs'][$i]['num_back_channel_elements']; $j++) { - $ThisFileInfo['aac']['program_configs'][$i]['back_element_is_cpe'][$j] = (bool) getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 1)); - $bitoffset += 1; - $ThisFileInfo['aac']['program_configs'][$i]['back_element_tag_select'][$j] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4)); - $bitoffset += 4; - } - for ($j = 0; $j < $ThisFileInfo['aac']['program_configs'][$i]['num_lfe_channel_elements']; $j++) { - $ThisFileInfo['aac']['program_configs'][$i]['lfe_element_tag_select'][$j] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4)); - $bitoffset += 4; - } - for ($j = 0; $j < $ThisFileInfo['aac']['program_configs'][$i]['num_assoc_data_elements']; $j++) { - $ThisFileInfo['aac']['program_configs'][$i]['assoc_data_element_tag_select'][$j] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4)); - $bitoffset += 4; - } - for ($j = 0; $j < $ThisFileInfo['aac']['program_configs'][$i]['num_valid_cc_elements']; $j++) { - $ThisFileInfo['aac']['program_configs'][$i]['cc_element_is_ind_sw'][$j] = (bool) getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 1)); - $bitoffset += 1; - $ThisFileInfo['aac']['program_configs'][$i]['valid_cc_element_tag_select'][$j] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4)); - $bitoffset += 4; - } - - $bitoffset = ceil($bitoffset / 8) * 8; - - $ThisFileInfo['aac']['program_configs'][$i]['comment_field_bytes'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 8)); - $bitoffset += 8; - $ThisFileInfo['aac']['program_configs'][$i]['comment_field'] = getid3_lib::Bin2String(substr($AACheaderBitstream, $bitoffset, 8 * $ThisFileInfo['aac']['program_configs'][$i]['comment_field_bytes'])); - $bitoffset += 8 * $ThisFileInfo['aac']['program_configs'][$i]['comment_field_bytes']; - - - $ThisFileInfo['aac']['header']['profile_text'] = $this->AACprofileLookup($ThisFileInfo['aac']['program_configs'][$i]['object_type'], $ThisFileInfo['aac']['header']['mpeg_version']); - $ThisFileInfo['aac']['program_configs'][$i]['sampling_frequency'] = $this->AACsampleRateLookup($ThisFileInfo['aac']['program_configs'][$i]['sampling_frequency_index']); - $ThisFileInfo['audio']['sample_rate'] = $ThisFileInfo['aac']['program_configs'][$i]['sampling_frequency']; - $ThisFileInfo['audio']['channels'] = $this->AACchannelCountCalculate($ThisFileInfo['aac']['program_configs'][$i]); - if ($ThisFileInfo['aac']['program_configs'][$i]['comment_field']) { - $ThisFileInfo['aac']['comments'][] = $ThisFileInfo['aac']['program_configs'][$i]['comment_field']; - } - } - $ThisFileInfo['playtime_seconds'] = (($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) * 8) / $ThisFileInfo['audio']['bitrate']; - - $ThisFileInfo['audio']['encoder_options'] = $ThisFileInfo['aac']['header_type'].' '.$ThisFileInfo['aac']['header']['profile_text']; - - - - return true; - - } else { - - unset($ThisFileInfo['fileformat']); - unset($ThisFileInfo['aac']); - $ThisFileInfo['error'][] = 'AAC-ADIF synch not found at offset '.$ThisFileInfo['avdataoffset'].' (expected "ADIF", found "'.substr($AACheader, 0, 4).'" instead)'; - return false; - - } - - } - - - function getAACADTSheaderFilepointer(&$fd, &$ThisFileInfo, $MaxFramesToScan=1000000, $ReturnExtendedInfo=false) { - // based loosely on code from AACfile by Jurgen Faul <jfaulØgmx.de> - // http://jfaul.de/atl or http://j-faul.virtualave.net/atl/atl.html - - - // http://faac.sourceforge.net/wiki/index.php?page=ADTS - - // * ADTS Fixed Header: these don't change from frame to frame - // syncword 12 always: '111111111111' - // ID 1 0: MPEG-4, 1: MPEG-2 - // layer 2 always: '00' - // protection_absent 1 - // profile 2 - // sampling_frequency_index 4 - // private_bit 1 - // channel_configuration 3 - // original/copy 1 - // home 1 - // emphasis 2 only if ID == 0 (ie MPEG-4) - - // * ADTS Variable Header: these can change from frame to frame - // copyright_identification_bit 1 - // copyright_identification_start 1 - // aac_frame_length 13 length of the frame including header (in bytes) - // adts_buffer_fullness 11 0x7FF indicates VBR - // no_raw_data_blocks_in_frame 2 - - // * ADTS Error check - // crc_check 16 only if protection_absent == 0 - - $byteoffset = 0; - $framenumber = 0; - - // Init bit pattern array - static $decbin = array(); - - // Populate $bindec - for ($i = 0; $i < 256; $i++) { - $decbin[chr($i)] = str_pad(decbin($i), 8, '0', STR_PAD_LEFT); - } - - // used to calculate bitrate below - $BitrateCache = array(); - - - while (true) { - // breaks out when end-of-file encountered, or invalid data found, - // or MaxFramesToScan frames have been scanned - - if ($byteoffset >= pow(2, 31)) { - $ThisFileInfo['warning'][] = 'Unable to parse AAC file beyond '.ftell($fd).' (PHP does not support file operations beyond 2GB)'; - return false; - } - fseek($fd, $byteoffset, SEEK_SET); - - // First get substring - $substring = fread($fd, 10); - $substringlength = strlen($substring); - if ($substringlength != 10) { - $ThisFileInfo['error'][] = 'Failed to read 10 bytes at offset '.(ftell($fd) - $substringlength).' (only read '.$substringlength.' bytes)'; - return false; - } - - // Initialise $AACheaderBitstream - $AACheaderBitstream = ''; - - // Loop thru substring chars - for ($i = 0; $i < 10; $i++) { - $AACheaderBitstream .= $decbin[$substring{$i}]; - } - - $bitoffset = 0; - - $synctest = bindec(substr($AACheaderBitstream, $bitoffset, 12)); - - $bitoffset += 12; - if ($synctest != 0x0FFF) { - $ThisFileInfo['error'][] = 'Synch pattern (0x0FFF) not found at offset '.(ftell($fd) - 10).' (found 0x0'.strtoupper(dechex($synctest)).' instead)'; - if ($ThisFileInfo['fileformat'] == 'aac') { - return true; - } - return false; - } - - // Gather info for first frame only - this takes time to do 1000 times! - if ($framenumber > 0) { - - if (!$AACheaderBitstream[$bitoffset]) { - - // MPEG-4 - $bitoffset += 20; - - } else { - - // MPEG-2 - $bitoffset += 18; - - } - - } else { - - $ThisFileInfo['aac']['header_type'] = 'ADTS'; - $ThisFileInfo['aac']['header']['synch'] = $synctest; - $ThisFileInfo['fileformat'] = 'aac'; - $ThisFileInfo['audio']['dataformat'] = 'aac'; - - $ThisFileInfo['aac']['header']['mpeg_version'] = ((substr($AACheaderBitstream, $bitoffset, 1) == '0') ? 4 : 2); - $bitoffset += 1; - $ThisFileInfo['aac']['header']['layer'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 2)); - $bitoffset += 2; - if ($ThisFileInfo['aac']['header']['layer'] != 0) { - $ThisFileInfo['error'][] = 'Layer error - expected 0x00, found 0x'.dechex($ThisFileInfo['aac']['header']['layer']).' instead'; - return false; - } - $ThisFileInfo['aac']['header']['crc_present'] = ((substr($AACheaderBitstream, $bitoffset, 1) == '0') ? true : false); - $bitoffset += 1; - $ThisFileInfo['aac']['header']['profile_id'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 2)); - $bitoffset += 2; - $ThisFileInfo['aac']['header']['profile_text'] = $this->AACprofileLookup($ThisFileInfo['aac']['header']['profile_id'], $ThisFileInfo['aac']['header']['mpeg_version']); - - $ThisFileInfo['aac']['header']['sample_frequency_index'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 4)); - $bitoffset += 4; - $ThisFileInfo['aac']['header']['sample_frequency'] = $this->AACsampleRateLookup($ThisFileInfo['aac']['header']['sample_frequency_index']); - if ($ThisFileInfo['aac']['header']['sample_frequency'] == 0) { - $ThisFileInfo['error'][] = 'Corrupt AAC file: sample_frequency == zero'; - return false; - } - $ThisFileInfo['audio']['sample_rate'] = $ThisFileInfo['aac']['header']['sample_frequency']; - - $ThisFileInfo['aac']['header']['private'] = (bool) getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 1)); - $bitoffset += 1; - $ThisFileInfo['aac']['header']['channel_configuration'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 3)); - $bitoffset += 3; - $ThisFileInfo['audio']['channels'] = $ThisFileInfo['aac']['header']['channel_configuration']; - $ThisFileInfo['aac']['header']['original'] = (bool) getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 1)); - $bitoffset += 1; - $ThisFileInfo['aac']['header']['home'] = (bool) getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 1)); - $bitoffset += 1; - - if ($ThisFileInfo['aac']['header']['mpeg_version'] == 4) { - $ThisFileInfo['aac']['header']['emphasis'] = getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 2)); - $bitoffset += 2; - } - - if ($ReturnExtendedInfo) { - - $ThisFileInfo['aac'][$framenumber]['copyright_id_bit'] = (bool) getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 1)); - $bitoffset += 1; - $ThisFileInfo['aac'][$framenumber]['copyright_id_start'] = (bool) getid3_lib::Bin2Dec(substr($AACheaderBitstream, $bitoffset, 1)); - $bitoffset += 1; - - } else { - - $bitoffset += 2; - - } - - } - - $FrameLength = bindec(substr($AACheaderBitstream, $bitoffset, 13)); - - if (!isset($BitrateCache[$FrameLength])) { - $BitrateCache[$FrameLength] = ($ThisFileInfo['aac']['header']['sample_frequency'] / 1024) * $FrameLength * 8; - } - @$ThisFileInfo['aac']['bitrate_distribution'][$BitrateCache[$FrameLength]]++; - - $ThisFileInfo['aac'][$framenumber]['aac_frame_length'] = $FrameLength; - $bitoffset += 13; - $ThisFileInfo['aac'][$framenumber]['adts_buffer_fullness'] = bindec(substr($AACheaderBitstream, $bitoffset, 11)); - $bitoffset += 11; - if ($ThisFileInfo['aac'][$framenumber]['adts_buffer_fullness'] == 0x07FF) { - $ThisFileInfo['audio']['bitrate_mode'] = 'vbr'; - } else { - $ThisFileInfo['audio']['bitrate_mode'] = 'cbr'; - } - $ThisFileInfo['aac'][$framenumber]['num_raw_data_blocks'] = bindec(substr($AACheaderBitstream, $bitoffset, 2)); - $bitoffset += 2; - - if ($ThisFileInfo['aac']['header']['crc_present']) { - //$ThisFileInfo['aac'][$framenumber]['crc'] = bindec(substr($AACheaderBitstream, $bitoffset, 16)); - $bitoffset += 16; - } - - if (!$ReturnExtendedInfo) { - unset($ThisFileInfo['aac'][$framenumber]); - } - - $byteoffset += $FrameLength; - if ((++$framenumber < $MaxFramesToScan) && (($byteoffset + 10) < $ThisFileInfo['avdataend'])) { - - // keep scanning - - } else { - - $ThisFileInfo['aac']['frames'] = $framenumber; - $ThisFileInfo['playtime_seconds'] = ($ThisFileInfo['avdataend'] / $byteoffset) * (($framenumber * 1024) / $ThisFileInfo['aac']['header']['sample_frequency']); // (1 / % of file scanned) * (samples / (samples/sec)) = seconds - if ($ThisFileInfo['playtime_seconds'] == 0) { - $ThisFileInfo['error'][] = 'Corrupt AAC file: playtime_seconds == zero'; - return false; - } - $ThisFileInfo['audio']['bitrate'] = (($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) * 8) / $ThisFileInfo['playtime_seconds']; - ksort($ThisFileInfo['aac']['bitrate_distribution']); - - $ThisFileInfo['audio']['encoder_options'] = $ThisFileInfo['aac']['header_type'].' '.$ThisFileInfo['aac']['header']['profile_text']; - - return true; - - } - } - // should never get here. - } - - function AACsampleRateLookup($samplerateid) { - static $AACsampleRateLookup = array(); - if (empty($AACsampleRateLookup)) { - $AACsampleRateLookup[0] = 96000; - $AACsampleRateLookup[1] = 88200; - $AACsampleRateLookup[2] = 64000; - $AACsampleRateLookup[3] = 48000; - $AACsampleRateLookup[4] = 44100; - $AACsampleRateLookup[5] = 32000; - $AACsampleRateLookup[6] = 24000; - $AACsampleRateLookup[7] = 22050; - $AACsampleRateLookup[8] = 16000; - $AACsampleRateLookup[9] = 12000; - $AACsampleRateLookup[10] = 11025; - $AACsampleRateLookup[11] = 8000; - $AACsampleRateLookup[12] = 0; - $AACsampleRateLookup[13] = 0; - $AACsampleRateLookup[14] = 0; - $AACsampleRateLookup[15] = 0; - } - return (isset($AACsampleRateLookup[$samplerateid]) ? $AACsampleRateLookup[$samplerateid] : 'invalid'); - } - - function AACprofileLookup($profileid, $mpegversion) { - static $AACprofileLookup = array(); - if (empty($AACprofileLookup)) { - $AACprofileLookup[2][0] = 'Main profile'; - $AACprofileLookup[2][1] = 'Low Complexity profile (LC)'; - $AACprofileLookup[2][2] = 'Scalable Sample Rate profile (SSR)'; - $AACprofileLookup[2][3] = '(reserved)'; - $AACprofileLookup[4][0] = 'AAC_MAIN'; - $AACprofileLookup[4][1] = 'AAC_LC'; - $AACprofileLookup[4][2] = 'AAC_SSR'; - $AACprofileLookup[4][3] = 'AAC_LTP'; - } - return (isset($AACprofileLookup[$mpegversion][$profileid]) ? $AACprofileLookup[$mpegversion][$profileid] : 'invalid'); - } - - function AACchannelCountCalculate($program_configs) { - $channels = 0; - for ($i = 0; $i < $program_configs['num_front_channel_elements']; $i++) { - $channels++; - if ($program_configs['front_element_is_cpe'][$i]) { - // each front element is channel pair (CPE = Channel Pair Element) - $channels++; - } - } - for ($i = 0; $i < $program_configs['num_side_channel_elements']; $i++) { - $channels++; - if ($program_configs['side_element_is_cpe'][$i]) { - // each side element is channel pair (CPE = Channel Pair Element) - $channels++; - } - } - for ($i = 0; $i < $program_configs['num_back_channel_elements']; $i++) { - $channels++; - if ($program_configs['back_element_is_cpe'][$i]) { - // each back element is channel pair (CPE = Channel Pair Element) - $channels++; - } - } - for ($i = 0; $i < $program_configs['num_lfe_channel_elements']; $i++) { - $channels++; - } - return $channels; - } - -} - - -?>
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