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aircokol/gist:cc417b1157fc389cd5bbd3dd373242fa

Forked from jameshartig/gist:2357002
Created October 2, 2016 17:08
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Revisions

  1. @jameshartig jameshartig revised this gist Apr 15, 2012. 1 changed file with 1 addition and 1 deletion.
    2 changes: 1 addition & 1 deletion gistfile1.aw
    View file
    Original file line number Diff line number Diff line change
    @@ -97,6 +97,6 @@ function getMP3BitRateSampleRate($filename)
    /*
    Example:
    if (!empty($_FILES['mp3'])) {
    $data = verifyMP3File($_FILES['mp3']['tmp_name']);
    $data = getMP3BitRateSampleRate($_FILES['mp3']['tmp_name']);
    }
    */
  2. @jameshartig jameshartig revised this gist Apr 15, 2012. 1 changed file with 36 additions and 23 deletions.
    59 changes: 36 additions & 23 deletions gistfile1.aw
    View file
    Original file line number Diff line number Diff line change
    @@ -29,7 +29,7 @@ function getMP3BitRateSampleRate($filename)
    array(22050,24000,16000), //mpeg 2
    array(44100,48000,32000), //mpeg 1
    );
    $bToRead = 1024 * 6;
    $bToRead = 1024 * 12;

    $fileData = array('bitRate' => 0, 'sampleRate' => 0);
    $fp = fopen($filename, 'r');
    @@ -42,43 +42,56 @@ function getMP3BitRateSampleRate($filename)

    $bytes = unpack('C*', $data);
    $frames = array();
    $lastFrameVerify = null;

    for ($o = 0; $o < count($bytes) - 4; $o++) {
    for ($o = 1; $o < count($bytes) - 4; $o++) {

    //http://mpgedit.org/mpgedit/mpeg_format/MP3Format.html
    //header is AAAAAAAA AAABBCCD EEEEFFGH IIJJKLMM
    if (($bytes[$o] & 0xFF) == 0xFF && ($bytes[$o+1] & 0xE0) == 0xE0) {
    if (($bytes[$o] & 255) == 255 && ($bytes[$o+1] & 224) == 224) {
    $frame = array();
    $frame['version'] = ($bytes[$o+1] & 24) >> 3; //get BB (0 -> 3)
    $frame['layer'] = abs((($bytes[$o+1] & 6) >> 1) - 4); //get CC (1 -> 3), then invert
    $frame['srI'] = ($bytes[$o+2] & 12) >> 2; //get FF (0 -> 3)
    $frame['brR'] = ($bytes[$o+2] & 240) >> 4; //get EEEE (0 -> 15)
    if ($frame['version'] != 1 && $frame['layer'] > 0 && $frame['srI'] < 3 && $frame['brR'] != 15 && $frame['brR'] != 0) {
    //valid frame!
    $frames[] = array_slice($bytes, $o-1, 4);
    $srIndex = ($bytes[$o+2] & 12) >> 2; //get FF (0 -> 3)
    $brRow = ($bytes[$o+2] & 240) >> 4; //get EEEE (0 -> 15)
    $frame['padding'] = ($bytes[$o+2] & 2) >> 1; //get G
    if ($frame['version'] != 1 && $frame['layer'] > 0 && $srIndex < 3 && $brRow != 15 && $brRow != 0 &&
    (!$lastFrameVerify || $lastFrameVerify === $bytes[$o+1])) {
    //valid frame header

    //calculate how much to skip to get to the next header
    $frame['sampleRate'] = $sampleRates[$frame['version']][$srIndex];
    if ($frame['version'] & 1 == 1) {
    $frame['bitRate'] = $bitRates[$brRow][$frame['layer']-1]; //v1 and l1,l2,l3
    } else {
    $frame['bitRate'] = $bitRates[$brRow][($frame['layer'] & 2 >> 1)+3]; //v2 and l1 or l2/l3 (3 is the offset in the arrays)
    }

    if ($frame['layer'] == 1) {
    $frame['frameLength'] = (12 * $frame['bitRate'] * 1000 / $frame['sampleRate'] + $frame['padding']) * 4;
    } else {
    $frame['frameLength'] = 144 * $frame['bitRate'] * 1000 / $frame['sampleRate'] + $frame['padding'];
    }

    $frames[] = $frame;
    $lastFrameVerify = $bytes[$o+1];
    $o += floor($frame['frameLength'] - 1);
    } else {
    $frames = array();
    $lastFrameVerify = null;
    }
    }
    if (count($frames) <= 4) { //verify at least 4 frames to make sure its an mp3
    $o += 3;
    if (count($frames) < 3) { //verify at least 3 frames to make sure its an mp3
    continue;
    }
    //throw out the first result as it is usually wrong
    array_shift($frames);

    //loop through verified frames trying to get any information we can
    do {
    $header = array_shift($frames);
    $fileData['sampleRate'] = $sampleRates[$header['version']][$header['srI']];
    if ($header['version'] & 1 == 1) {
    $fileData['bitRate'] = $bitRates[$header['brR']][$header['layer']-1]; //v1 and l1,l2,l3
    } else {
    $fileData['bitRate'] = $bitRates[$header['brR']][($header['layer'] & 2 >> 1)+3]; //v2 and l1 or l2/l3 (3 is the offset in the arrays)
    }
    } while (count($frames) && (!$fileData['bitRate'] || !$fileData['sampleRate']));
    $header = array_pop($frames);
    $fileData['sampleRate'] = $header['sampleRate'];
    $fileData['bitRate'] = $header['bitRate'];

    break;
    }

    //if both are 0 then its not an mp3
    return $fileData;
    }
    /*
  3. @jameshartig jameshartig revised this gist Apr 14, 2012. 1 changed file with 20 additions and 36 deletions.
    56 changes: 20 additions & 36 deletions gistfile1.aw
    View file
    Original file line number Diff line number Diff line change
    @@ -24,9 +24,10 @@ function getMP3BitRateSampleRate($filename)
    array(-1,-1,-1,-1,-1),
    );
    $sampleRates = array(
    array(44100,48000,32000),
    array(22050,24000,16000),
    array(11025,12000,8000),
    array(11025,12000,8000), //mpeg 2.5
    array(0,0,0),
    array(22050,24000,16000), //mpeg 2
    array(44100,48000,32000), //mpeg 1
    );
    $bToRead = 1024 * 6;

    @@ -44,8 +45,17 @@ function getMP3BitRateSampleRate($filename)

    for ($o = 0; $o < count($bytes) - 4; $o++) {

    //header is AAAAAAAA AAABBCCD EEEEFFGH IIJJKLMM
    if (($bytes[$o] & 0xFF) == 0xFF && ($bytes[$o+1] & 0xE0) == 0xE0) {
    $frames[] = array_slice($bytes, $o-1, 4);
    $frame = array();
    $frame['version'] = ($bytes[$o+1] & 24) >> 3; //get BB (0 -> 3)
    $frame['layer'] = abs((($bytes[$o+1] & 6) >> 1) - 4); //get CC (1 -> 3), then invert
    $frame['srI'] = ($bytes[$o+2] & 12) >> 2; //get FF (0 -> 3)
    $frame['brR'] = ($bytes[$o+2] & 240) >> 4; //get EEEE (0 -> 15)
    if ($frame['version'] != 1 && $frame['layer'] > 0 && $frame['srI'] < 3 && $frame['brR'] != 15 && $frame['brR'] != 0) {
    //valid frame!
    $frames[] = array_slice($bytes, $o-1, 4);
    }
    }
    if (count($frames) <= 4) { //verify at least 4 frames to make sure its an mp3
    $o += 3;
    @@ -57,44 +67,18 @@ function getMP3BitRateSampleRate($filename)
    //loop through verified frames trying to get any information we can
    do {
    $header = array_shift($frames);
    $version = $header[1] & 0x18;
    $layer = $header[1] & 0x06;

    //get sample rate
    $srIndex = ($header[2] & 0x0C) >> 2;
    switch ($version) {
    case 0x18:
    $fileData['sampleRate'] = $sampleRates[0][$srIndex];
    break;
    case 0x10:
    $fileData['sampleRate'] = $sampleRates[1][$srIndex];
    break;
    case 0x00:
    $fileData['sampleRate'] = $sampleRates[2][$srIndex];
    break;
    }

    //bit rate
    $brRow = ($header[2] & 0xF0) >> 4;
    if ($brRow != 15 && $brRow != 0) {
    if($version == 0x18 && $layer == 0x06) {
    $fileData['bitRate'] = $bitRates[$brRow][0];
    } else if($version == 0x18 && $layer == 0x04) {
    $fileData['bitRate'] = $bitRates[$brRow][1];
    } else if($version == 0x18 && $layer == 0x02) {
    $fileData['bitRate'] = $bitRates[$brRow][2];
    } else if(($version == 0x10 || $version == 0x00) && $layer == 0x06) {
    $fileData['bitRate'] = $bitRates[$brRow][3];
    } else if(($version == 0x10 || $version == 0x00) && ($layer == 0x04 || $layer == 0x02) ) {
    $fileData['bitRate'] = $bitRates[$brRow][4];
    }
    $fileData['sampleRate'] = $sampleRates[$header['version']][$header['srI']];
    if ($header['version'] & 1 == 1) {
    $fileData['bitRate'] = $bitRates[$header['brR']][$header['layer']-1]; //v1 and l1,l2,l3
    } else {
    $fileData['bitRate'] = $bitRates[$header['brR']][($header['layer'] & 2 >> 1)+3]; //v2 and l1 or l2/l3 (3 is the offset in the arrays)
    }
    } while (count($frames) && (!$fileData['bitRate'] || !$fileData['sampleRate']));

    break;
    }

    //if both are 0, then it probably isn't an MP3
    //if both are 0 then its not an mp3
    return $fileData;
    }
    /*
  4. @jameshartig jameshartig revised this gist Apr 11, 2012. 1 changed file with 1 addition and 1 deletion.
    2 changes: 1 addition & 1 deletion gistfile1.aw
    View file
    Original file line number Diff line number Diff line change
    @@ -1,4 +1,4 @@
    //returns an assoc array with bitRate (kbps) and sampleRate (khz)
    //returns an assoc array with bitRate (kbps) and sampleRate (hz)
    function getMP3BitRateSampleRate($filename)
    {
    if (!file_exists($filename)) {
  5. @jameshartig jameshartig created this gist Apr 11, 2012.
    105 changes: 105 additions & 0 deletions gistfile1.aw
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,105 @@
    //returns an assoc array with bitRate (kbps) and sampleRate (khz)
    function getMP3BitRateSampleRate($filename)
    {
    if (!file_exists($filename)) {
    return false;
    }

    $bitRates = array(
    array(0,0,0,0,0),
    array(32,32,32,32,8),
    array(64,48,40,48,16),
    array(96,56,48,56,24),
    array(128,64,56,64,32),
    array(160,80,64,80,40),
    array(192,96,80,96,48),
    array(224,112,96,112,56),
    array(256,128,112,128,64),
    array(288,160,128,144,80),
    array(320,192,160,160,96),
    array(352,224,192,176,112),
    array(384,256,224,192,128),
    array(416,320,256,224,144),
    array(448,384,320,256,160),
    array(-1,-1,-1,-1,-1),
    );
    $sampleRates = array(
    array(44100,48000,32000),
    array(22050,24000,16000),
    array(11025,12000,8000),
    );
    $bToRead = 1024 * 6;

    $fileData = array('bitRate' => 0, 'sampleRate' => 0);
    $fp = fopen($filename, 'r');
    if (!$fp) {
    return false;
    }
    //seek to 8kb before the end of the file
    fseek($fp, -1 * $bToRead, SEEK_END);
    $data = fread($fp, $bToRead);

    $bytes = unpack('C*', $data);
    $frames = array();

    for ($o = 0; $o < count($bytes) - 4; $o++) {

    if (($bytes[$o] & 0xFF) == 0xFF && ($bytes[$o+1] & 0xE0) == 0xE0) {
    $frames[] = array_slice($bytes, $o-1, 4);
    }
    if (count($frames) <= 4) { //verify at least 4 frames to make sure its an mp3
    $o += 3;
    continue;
    }
    //throw out the first result as it is usually wrong
    array_shift($frames);

    //loop through verified frames trying to get any information we can
    do {
    $header = array_shift($frames);
    $version = $header[1] & 0x18;
    $layer = $header[1] & 0x06;

    //get sample rate
    $srIndex = ($header[2] & 0x0C) >> 2;
    switch ($version) {
    case 0x18:
    $fileData['sampleRate'] = $sampleRates[0][$srIndex];
    break;
    case 0x10:
    $fileData['sampleRate'] = $sampleRates[1][$srIndex];
    break;
    case 0x00:
    $fileData['sampleRate'] = $sampleRates[2][$srIndex];
    break;
    }

    //bit rate
    $brRow = ($header[2] & 0xF0) >> 4;
    if ($brRow != 15 && $brRow != 0) {
    if($version == 0x18 && $layer == 0x06) {
    $fileData['bitRate'] = $bitRates[$brRow][0];
    } else if($version == 0x18 && $layer == 0x04) {
    $fileData['bitRate'] = $bitRates[$brRow][1];
    } else if($version == 0x18 && $layer == 0x02) {
    $fileData['bitRate'] = $bitRates[$brRow][2];
    } else if(($version == 0x10 || $version == 0x00) && $layer == 0x06) {
    $fileData['bitRate'] = $bitRates[$brRow][3];
    } else if(($version == 0x10 || $version == 0x00) && ($layer == 0x04 || $layer == 0x02) ) {
    $fileData['bitRate'] = $bitRates[$brRow][4];
    }
    }
    } while (count($frames) && (!$fileData['bitRate'] || !$fileData['sampleRate']));

    break;
    }

    //if both are 0, then it probably isn't an MP3
    return $fileData;
    }
    /*
    Example:
    if (!empty($_FILES['mp3'])) {
    $data = verifyMP3File($_FILES['mp3']['tmp_name']);
    }
    */