function getOnlyMPEGaudioInfo($fd, &$ThisFileInfo, $avdataoffset, $BitrateHistogram = false)
{
// looks for synch, decodes MPEG audio header
static $MPEGaudioVersionLookup;
static $MPEGaudioLayerLookup;
static $MPEGaudioBitrateLookup;
if (empty($MPEGaudioVersionLookup)) {
$MPEGaudioVersionLookup = getid3_mp3::MPEGaudioVersionArray();
$MPEGaudioLayerLookup = getid3_mp3::MPEGaudioLayerArray();
$MPEGaudioBitrateLookup = getid3_mp3::MPEGaudioBitrateArray();
}
fseek($fd, $avdataoffset, SEEK_SET);
$sync_seek_buffer_size = min(128 * 1024, $ThisFileInfo['avdataend'] - $avdataoffset);
if ($sync_seek_buffer_size <= 0) {
$ThisFileInfo['error'][] = 'Invalid $sync_seek_buffer_size at offset ' . $avdataoffset;
return false;
}
$header = fread($fd, $sync_seek_buffer_size);
$sync_seek_buffer_size = strlen($header);
$SynchSeekOffset = 0;
while ($SynchSeekOffset < $sync_seek_buffer_size) {
if ($avdataoffset + $SynchSeekOffset < $ThisFileInfo['avdataend'] && !feof($fd)) {
if ($SynchSeekOffset > $sync_seek_buffer_size) {
// if a synch's not found within the first 128k bytes, then give up
$ThisFileInfo['error'][] = 'Could not find valid MPEG audio synch within the first ' . round($sync_seek_buffer_size / 1024) . 'kB';
if (isset($ThisFileInfo['audio']['bitrate'])) {
unset($ThisFileInfo['audio']['bitrate']);
}
if (isset($ThisFileInfo['mpeg']['audio'])) {
unset($ThisFileInfo['mpeg']['audio']);
}
if (empty($ThisFileInfo['mpeg'])) {
unset($ThisFileInfo['mpeg']);
}
return false;
} elseif (feof($fd)) {
$ThisFileInfo['error'][] = 'Could not find valid MPEG audio synch before end of file';
if (isset($ThisFileInfo['audio']['bitrate'])) {
unset($ThisFileInfo['audio']['bitrate']);
}
if (isset($ThisFileInfo['mpeg']['audio'])) {
unset($ThisFileInfo['mpeg']['audio']);
}
if (isset($ThisFileInfo['mpeg']) && (!is_array($ThisFileInfo['mpeg']) || count($ThisFileInfo['mpeg']) == 0)) {
unset($ThisFileInfo['mpeg']);
}
return false;
}
}
if ($SynchSeekOffset + 1 >= strlen($header)) {
$ThisFileInfo['error'][] = 'Could not find valid MPEG synch before end of file';
return false;
}
if ($header[$SynchSeekOffset] == "ÿ" && $header[$SynchSeekOffset + 1] > "à") {
// synch detected
if (!isset($FirstFrameThisfileInfo) && !isset($ThisFileInfo['mpeg']['audio'])) {
$FirstFrameThisfileInfo = $ThisFileInfo;
$FirstFrameAVDataOffset = $avdataoffset + $SynchSeekOffset;
if (!getid3_mp3::decodeMPEGaudioHeader($fd, $avdataoffset + $SynchSeekOffset, $FirstFrameThisfileInfo, false)) {
// if this is the first valid MPEG-audio frame, save it in case it's a VBR header frame and there's
// garbage between this frame and a valid sequence of MPEG-audio frames, to be restored below
unset($FirstFrameThisfileInfo);
}
}
$dummy = $ThisFileInfo;
// only overwrite real data if valid header found
if (getid3_mp3::decodeMPEGaudioHeader($fd, $avdataoffset + $SynchSeekOffset, $dummy, true)) {
$ThisFileInfo = $dummy;
$ThisFileInfo['avdataoffset'] = $avdataoffset + $SynchSeekOffset;
switch (@$ThisFileInfo['fileformat']) {
case '':
case 'id3':
case 'ape':
case 'mp3':
$ThisFileInfo['fileformat'] = 'mp3';
$ThisFileInfo['audio']['dataformat'] = 'mp3';
break;
}
if (isset($FirstFrameThisfileInfo['mpeg']['audio']['bitrate_mode']) && $FirstFrameThisfileInfo['mpeg']['audio']['bitrate_mode'] == 'vbr') {
if (!(abs($ThisFileInfo['audio']['bitrate'] - $FirstFrameThisfileInfo['audio']['bitrate']) <= 1)) {
// If there is garbage data between a valid VBR header frame and a sequence
// of valid MPEG-audio frames the VBR data is no longer discarded.
$ThisFileInfo = $FirstFrameThisfileInfo;
$ThisFileInfo['avdataoffset'] = $FirstFrameAVDataOffset;
$ThisFileInfo['fileformat'] = 'mp3';
$ThisFileInfo['audio']['dataformat'] = 'mp3';
$dummy = $ThisFileInfo;
unset($dummy['mpeg']['audio']);
$GarbageOffsetStart = $FirstFrameAVDataOffset + $FirstFrameThisfileInfo['mpeg']['audio']['framelength'];
$GarbageOffsetEnd = $avdataoffset + $SynchSeekOffset;
if (getid3_mp3::decodeMPEGaudioHeader($fd, $GarbageOffsetEnd, $dummy, true, true)) {
$ThisFileInfo = $dummy;
$ThisFileInfo['avdataoffset'] = $GarbageOffsetEnd;
$ThisFileInfo['warning'][] = 'apparently-valid VBR header not used because could not find ' . GETID3_MP3_VALID_CHECK_FRAMES . ' consecutive MPEG-audio frames immediately after VBR header (garbage data for ' . ($GarbageOffsetEnd - $GarbageOffsetStart) . ' bytes between ' . $GarbageOffsetStart . ' and ' . $GarbageOffsetEnd . '), but did find valid CBR stream starting at ' . $GarbageOffsetEnd;
} else {
$ThisFileInfo['warning'][] = 'using data from VBR header even though could not find ' . GETID3_MP3_VALID_CHECK_FRAMES . ' consecutive MPEG-audio frames immediately after VBR header (garbage data for ' . ($GarbageOffsetEnd - $GarbageOffsetStart) . ' bytes between ' . $GarbageOffsetStart . ' and ' . $GarbageOffsetEnd . ')';
}
}
}
if (isset($ThisFileInfo['mpeg']['audio']['bitrate_mode']) && $ThisFileInfo['mpeg']['audio']['bitrate_mode'] == 'vbr' && !isset($ThisFileInfo['mpeg']['audio']['VBR_method'])) {
// VBR file with no VBR header
$BitrateHistogram = true;
}
if ($BitrateHistogram) {
$ThisFileInfo['mpeg']['audio']['stereo_distribution'] = array('stereo' => 0, 'joint stereo' => 0, 'dual channel' => 0, 'mono' => 0);
$ThisFileInfo['mpeg']['audio']['version_distribution'] = array('1' => 0, '2' => 0, '2.5' => 0);
if ($ThisFileInfo['mpeg']['audio']['version'] == '1') {
if ($ThisFileInfo['mpeg']['audio']['layer'] == 3) {
$ThisFileInfo['mpeg']['audio']['bitrate_distribution'] = array('free' => 0, 32000 => 0, 40000 => 0, 48000 => 0, 56000 => 0, 64000 => 0, 80000 => 0, 96000 => 0, 112000 => 0, 128000 => 0, 160000 => 0, 192000 => 0, 224000 => 0, 256000 => 0, 320000 => 0);
} elseif ($ThisFileInfo['mpeg']['audio']['layer'] == 2) {
$ThisFileInfo['mpeg']['audio']['bitrate_distribution'] = array('free' => 0, 32000 => 0, 48000 => 0, 56000 => 0, 64000 => 0, 80000 => 0, 96000 => 0, 112000 => 0, 128000 => 0, 160000 => 0, 192000 => 0, 224000 => 0, 256000 => 0, 320000 => 0, 384000 => 0);
} elseif ($ThisFileInfo['mpeg']['audio']['layer'] == 1) {
$ThisFileInfo['mpeg']['audio']['bitrate_distribution'] = array('free' => 0, 32000 => 0, 64000 => 0, 96000 => 0, 128000 => 0, 160000 => 0, 192000 => 0, 224000 => 0, 256000 => 0, 288000 => 0, 320000 => 0, 352000 => 0, 384000 => 0, 416000 => 0, 448000 => 0);
}
} elseif ($ThisFileInfo['mpeg']['audio']['layer'] == 1) {
$ThisFileInfo['mpeg']['audio']['bitrate_distribution'] = array('free' => 0, 32000 => 0, 48000 => 0, 56000 => 0, 64000 => 0, 80000 => 0, 96000 => 0, 112000 => 0, 128000 => 0, 144000 => 0, 160000 => 0, 176000 => 0, 192000 => 0, 224000 => 0, 256000 => 0);
} else {
$ThisFileInfo['mpeg']['audio']['bitrate_distribution'] = array('free' => 0, 8000 => 0, 16000 => 0, 24000 => 0, 32000 => 0, 40000 => 0, 48000 => 0, 56000 => 0, 64000 => 0, 80000 => 0, 96000 => 0, 112000 => 0, 128000 => 0, 144000 => 0, 160000 => 0);
}
$dummy = array('error' => $ThisFileInfo['error'], 'warning' => $ThisFileInfo['warning'], 'avdataend' => $ThisFileInfo['avdataend'], 'avdataoffset' => $ThisFileInfo['avdataoffset']);
$synchstartoffset = $ThisFileInfo['avdataoffset'];
fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET);
// you can play with these numbers:
$max_frames_scan = 50000;
$max_scan_segments = 10;
// don't play with these numbers:
$FastMode = false;
$SynchErrorsFound = 0;
$frames_scanned = 0;
$this_scan_segment = 0;
$frames_scan_per_segment = ceil($max_frames_scan / $max_scan_segments);
$pct_data_scanned = 0;
for ($current_segment = 0; $current_segment < $max_scan_segments; $current_segment++) {
//echo 'was at '.ftell($fd).'<br>';
$frames_scanned_this_segment = 0;
if (ftell($fd) >= $ThisFileInfo['avdataend']) {
//echo 'breaking because current position ('.ftell($fd).') is >= $ThisFileInfo[avdataend] ('.$ThisFileInfo['avdataend'].')<br>';
break;
}
$scan_start_offset[$current_segment] = max(ftell($fd), $ThisFileInfo['avdataoffset'] + round($current_segment * (($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) / $max_scan_segments)));
//echo 'start at '.$scan_start_offset[$current_segment].'<br>';
if ($current_segment > 0) {
fseek($fd, $scan_start_offset[$current_segment], SEEK_SET);
$buffer_4k = fread($fd, 4096);
for ($j = 0; $j < strlen($buffer_4k) - 4; $j++) {
if ($buffer_4k[$j] == "ÿ" && $buffer_4k[$j + 1] > "à") {
// synch detected
if (getid3_mp3::decodeMPEGaudioHeader($fd, $scan_start_offset[$current_segment] + $j, $dummy, false, false, $FastMode)) {
$calculated_next_offset = $scan_start_offset[$current_segment] + $j + $dummy['mpeg']['audio']['framelength'];
if (getid3_mp3::decodeMPEGaudioHeader($fd, $calculated_next_offset, $dummy, false, false, $FastMode)) {
$scan_start_offset[$current_segment] += $j;
break;
} else {
//echo 'header['.__LINE__.'] at '.($calculated_next_offset).' invalid<br>';
}
} else {
//echo 'header['.__LINE__.'] at '.($scan_start_offset[$current_segment] + $j).' invalid<br>';
}
}
}
}
//echo 'actually start at '.$scan_start_offset[$current_segment].'<br>';
$synchstartoffset = $scan_start_offset[$current_segment];
while (getid3_mp3::decodeMPEGaudioHeader($fd, $synchstartoffset, $dummy, false, false, $FastMode)) {
$FastMode = true;
$thisframebitrate = $MPEGaudioBitrateLookup[$MPEGaudioVersionLookup[$dummy['mpeg']['audio']['raw']['version']]][$MPEGaudioLayerLookup[$dummy['mpeg']['audio']['raw']['layer']]][$dummy['mpeg']['audio']['raw']['bitrate']];
if (empty($dummy['mpeg']['audio']['framelength'])) {
$SynchErrorsFound++;
$synchstartoffset++;
//echo ' [�] ';
} else {
//echo ' . ';
@$ThisFileInfo['mpeg']['audio']['bitrate_distribution'][$thisframebitrate]++;
@$ThisFileInfo['mpeg']['audio']['stereo_distribution'][$dummy['mpeg']['audio']['channelmode']]++;
@$ThisFileInfo['mpeg']['audio']['version_distribution'][$dummy['mpeg']['audio']['version']]++;
$synchstartoffset += $dummy['mpeg']['audio']['framelength'];
}
$frames_scanned++;
if ($frames_scan_per_segment && ++$frames_scanned_this_segment >= $frames_scan_per_segment) {
$this_pct_scanned = (ftell($fd) - $scan_start_offset[$current_segment]) / ($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']);
if ($current_segment == 0 && $this_pct_scanned * $max_scan_segments >= 1) {
// file likely contains < $max_frames_scan, just scan as one segment
$max_scan_segments = 1;
$frames_scan_per_segment = $max_frames_scan;
} else {
$pct_data_scanned += $this_pct_scanned;
//var_dump($pct_data_scanned);
//exit;
break;
}
}
}
//echo '<hr>';
}
if ($pct_data_scanned > 0) {
$ThisFileInfo['warning'][] = 'too many MPEG audio frames to scan, only scanned ' . $frames_scanned . ' frames in ' . $max_scan_segments . ' segments (' . number_format($pct_data_scanned * 100, 1) . '% of file) and extrapolated distribution, playtime and bitrate may be incorrect.';
foreach ($ThisFileInfo['mpeg']['audio'] as $key1 => $value1) {
if (!eregi('_distribution$', $key1)) {
continue;
}
foreach ($value1 as $key2 => $value2) {
$ThisFileInfo['mpeg']['audio'][$key1][$key2] = round($value2 / $pct_data_scanned);
}
}
}
if ($SynchErrorsFound > 0) {
$ThisFileInfo['warning'][] = 'Found ' . $SynchErrorsFound . ' synch errors in histogram analysis';
//return false;
}
$bittotal = 0;
$framecounter = 0;
foreach ($ThisFileInfo['mpeg']['audio']['bitrate_distribution'] as $bitratevalue => $bitratecount) {
$framecounter += $bitratecount;
if ($bitratevalue != 'free') {
$bittotal += $bitratevalue * $bitratecount;
}
}
if ($framecounter == 0) {
$ThisFileInfo['error'][] = 'Corrupt MP3 file: framecounter == zero';
return false;
}
$ThisFileInfo['mpeg']['audio']['frame_count'] = getid3_lib::CastAsInt($framecounter);
$ThisFileInfo['mpeg']['audio']['bitrate'] = $bittotal / $framecounter;
$ThisFileInfo['audio']['bitrate'] = $ThisFileInfo['mpeg']['audio']['bitrate'];
// Definitively set VBR vs CBR, even if the Xing/LAME/VBRI header says differently
$distinct_bitrates = 0;
foreach ($ThisFileInfo['mpeg']['audio']['bitrate_distribution'] as $bitrate_value => $bitrate_count) {
if ($bitrate_count > 0) {
$distinct_bitrates++;
}
}
if ($distinct_bitrates > 1) {
$ThisFileInfo['mpeg']['audio']['bitrate_mode'] = 'vbr';
} else {
$ThisFileInfo['mpeg']['audio']['bitrate_mode'] = 'cbr';
}
$ThisFileInfo['audio']['bitrate_mode'] = $ThisFileInfo['mpeg']['audio']['bitrate_mode'];
}
break;
// exit while()
}
}
$SynchSeekOffset++;
if ($avdataoffset + $SynchSeekOffset >= $ThisFileInfo['avdataend']) {
// end of file/data
if (empty($ThisFileInfo['mpeg']['audio'])) {
$ThisFileInfo['error'][] = 'could not find valid MPEG synch before end of file';
if (isset($ThisFileInfo['audio']['bitrate'])) {
unset($ThisFileInfo['audio']['bitrate']);
}
if (isset($ThisFileInfo['mpeg']['audio'])) {
unset($ThisFileInfo['mpeg']['audio']);
}
if (isset($ThisFileInfo['mpeg']) && (!is_array($ThisFileInfo['mpeg']) || empty($ThisFileInfo['mpeg']))) {
unset($ThisFileInfo['mpeg']);
}
return false;
}
break;
}
}
$ThisFileInfo['audio']['channels'] = $ThisFileInfo['mpeg']['audio']['channels'];
$ThisFileInfo['audio']['channelmode'] = $ThisFileInfo['mpeg']['audio']['channelmode'];
$ThisFileInfo['audio']['sample_rate'] = $ThisFileInfo['mpeg']['audio']['sample_rate'];
return true;
}
public function Analyze()
{
$getid3 = $this->getid3;
$getid3->info['mpeg']['video']['raw'] = array();
$info_mpeg_video =& $getid3->info['mpeg']['video'];
$info_mpeg_video_raw =& $info_mpeg_video['raw'];
$getid3->info['video'] = array();
$info_video =& $getid3->info['video'];
$getid3->include_module('audio.mp3');
if ($getid3->info['avdataend'] <= $getid3->info['avdataoffset']) {
throw new getid3_exception('"avdataend" (' . $getid3->info['avdataend'] . ') is unexpectedly less-than-or-equal-to "avdataoffset" (' . $getid3->info['avdataoffset'] . ')');
}
$getid3->info['fileformat'] = 'mpeg';
fseek($getid3->fp, $getid3->info['avdataoffset'], SEEK_SET);
$mpeg_stream_data = fread($getid3->fp, min(100000, $getid3->info['avdataend'] - $getid3->info['avdataoffset']));
$mpeg_stream_data_length = strlen($mpeg_stream_data);
$video_chunk_offset = 0;
while (substr($mpeg_stream_data, $video_chunk_offset++, 4) !== getid3_mpeg::VIDEO_SEQUENCE_HEADER) {
if ($video_chunk_offset >= $mpeg_stream_data_length) {
throw new getid3_exception('Could not find start of video block in the first 100,000 bytes (or before end of file) - this might not be an MPEG-video file?');
}
}
// Start code 32 bits
// horizontal frame size 12 bits
// vertical frame size 12 bits
// pixel aspect ratio 4 bits
// frame rate 4 bits
// bitrate 18 bits
// marker bit 1 bit
// VBV buffer size 10 bits
// constrained parameter flag 1 bit
// intra quant. matrix flag 1 bit
// intra quant. matrix values 512 bits (present if matrix flag == 1)
// non-intra quant. matrix flag 1 bit
// non-intra quant. matrix values 512 bits (present if matrix flag == 1)
$info_video['dataformat'] = 'mpeg';
$video_chunk_offset += strlen(getid3_mpeg::VIDEO_SEQUENCE_HEADER) - 1;
$frame_size_dword = getid3_lib::BigEndian2Int(substr($mpeg_stream_data, $video_chunk_offset, 3));
$video_chunk_offset += 3;
$aspect_ratio_frame_rate_dword = getid3_lib::BigEndian2Int(substr($mpeg_stream_data, $video_chunk_offset, 1));
$video_chunk_offset += 1;
$assorted_information = getid3_lib::BigEndian2Bin(substr($mpeg_stream_data, $video_chunk_offset, 4));
$video_chunk_offset += 4;
$info_mpeg_video_raw['framesize_horizontal'] = ($frame_size_dword & 0xfff000) >> 12;
// 12 bits for horizontal frame size
$info_mpeg_video_raw['framesize_vertical'] = $frame_size_dword & 0xfff;
// 12 bits for vertical frame size
$info_mpeg_video_raw['pixel_aspect_ratio'] = ($aspect_ratio_frame_rate_dword & 0xf0) >> 4;
$info_mpeg_video_raw['frame_rate'] = $aspect_ratio_frame_rate_dword & 0xf;
$info_mpeg_video['framesize_horizontal'] = $info_mpeg_video_raw['framesize_horizontal'];
$info_mpeg_video['framesize_vertical'] = $info_mpeg_video_raw['framesize_vertical'];
$info_mpeg_video['pixel_aspect_ratio'] = $this->MPEGvideoAspectRatioLookup($info_mpeg_video_raw['pixel_aspect_ratio']);
$info_mpeg_video['pixel_aspect_ratio_text'] = $this->MPEGvideoAspectRatioTextLookup($info_mpeg_video_raw['pixel_aspect_ratio']);
$info_mpeg_video['frame_rate'] = $this->MPEGvideoFramerateLookup($info_mpeg_video_raw['frame_rate']);
$info_mpeg_video_raw['bitrate'] = bindec(substr($assorted_information, 0, 18));
$info_mpeg_video_raw['marker_bit'] = (bool) bindec($assorted_information[18]);
$info_mpeg_video_raw['vbv_buffer_size'] = bindec(substr($assorted_information, 19, 10));
$info_mpeg_video_raw['constrained_param_flag'] = (bool) bindec($assorted_information[29]);
$info_mpeg_video_raw['intra_quant_flag'] = (bool) bindec($assorted_information[30]);
if ($info_mpeg_video_raw['intra_quant_flag']) {
// read 512 bits
$info_mpeg_video_raw['intra_quant'] = getid3_lib::BigEndian2Bin(substr($mpeg_stream_data, $video_chunk_offset, 64));
$video_chunk_offset += 64;
$info_mpeg_video_raw['non_intra_quant_flag'] = (bool) bindec($info_mpeg_video_raw['intra_quant'][511]);
$info_mpeg_video_raw['intra_quant'] = bindec($assorted_information[31]) . substr(getid3_lib::BigEndian2Bin(substr($mpeg_stream_data, $video_chunk_offset, 64)), 0, 511);
if ($info_mpeg_video_raw['non_intra_quant_flag']) {
$info_mpeg_video_raw['non_intra_quant'] = substr($mpeg_stream_data, $video_chunk_offset, 64);
$video_chunk_offset += 64;
}
} else {
$info_mpeg_video_raw['non_intra_quant_flag'] = (bool) bindec($assorted_information[31]);
if ($info_mpeg_video_raw['non_intra_quant_flag']) {
$info_mpeg_video_raw['non_intra_quant'] = substr($mpeg_stream_data, $video_chunk_offset, 64);
$video_chunk_offset += 64;
}
}
if ($info_mpeg_video_raw['bitrate'] == 0x3ffff) {
// 18 set bits
$getid3->warning('This version of getID3() cannot determine average bitrate of VBR MPEG video files');
$info_mpeg_video['bitrate_mode'] = 'vbr';
} else {
$info_mpeg_video['bitrate'] = $info_mpeg_video_raw['bitrate'] * 400;
$info_mpeg_video['bitrate_mode'] = 'cbr';
$info_video['bitrate'] = $info_mpeg_video['bitrate'];
}
$info_video['resolution_x'] = $info_mpeg_video['framesize_horizontal'];
$info_video['resolution_y'] = $info_mpeg_video['framesize_vertical'];
$info_video['frame_rate'] = $info_mpeg_video['frame_rate'];
$info_video['bitrate_mode'] = $info_mpeg_video['bitrate_mode'];
$info_video['pixel_aspect_ratio'] = $info_mpeg_video['pixel_aspect_ratio'];
$info_video['lossless'] = false;
$info_video['bits_per_sample'] = 24;
//0x000001B3 begins the sequence_header of every MPEG video stream.
//But in MPEG-2, this header must immediately be followed by an
//extension_start_code (0x000001B5) with a sequence_extension ID (1).
//(This extension contains all the additional MPEG-2 stuff.)
//MPEG-1 doesn't have this extension, so that's a sure way to tell the
//difference between MPEG-1 and MPEG-2 video streams.
$info_video['codec'] = substr($mpeg_stream_data, $video_chunk_offset, 4) == getid3_mpeg::VIDEO_EXTENSION_START ? 'MPEG-2' : 'MPEG-1';
$audio_chunk_offset = 0;
while (true) {
while (substr($mpeg_stream_data, $audio_chunk_offset++, 4) !== getid3_mpeg::AUDIO_START) {
if ($audio_chunk_offset >= $mpeg_stream_data_length) {
break 2;
}
}
for ($i = 0; $i <= 7; $i++) {
// some files have the MPEG-audio header 8 bytes after the end of the $00 $00 $01 $C0 signature, some have it up to 13 bytes (or more?) after
// I have no idea why or what the difference is, so this is a stupid hack.
// If anybody has any better idea of what's going on, please let me know - info@getid3.org
// make copy of info
$dummy = $getid3->info;
// clone getid3 - better safe than sorry
$clone = clone $this->getid3;
// check
$mp3 = new getid3_mp3($clone);
if ($mp3->decodeMPEGaudioHeader($getid3->fp, $audio_chunk_offset + 3 + 8 + $i, $dummy, false)) {
$getid3->info = $dummy;
$getid3->info['audio']['bitrate_mode'] = 'cbr';
$getid3->info['audio']['lossless'] = false;
break 2;
}
// destroy copy
unset($dummy);
}
}
// Temporary hack to account for interleaving overhead:
if (!empty($info_video['bitrate']) && !empty($getid3->info['audio']['bitrate'])) {
$getid3->info['playtime_seconds'] = ($getid3->info['avdataend'] - $getid3->info['avdataoffset']) * 8 / ($info_video['bitrate'] + $getid3->info['audio']['bitrate']);
// Interleaved MPEG audio/video files have a certain amount of overhead that varies
// by both video and audio bitrates, and not in any sensible, linear/logarithmic patter
// Use interpolated lookup tables to approximately guess how much is overhead, because
// playtime is calculated as filesize / total-bitrate
$getid3->info['playtime_seconds'] *= $this->MPEGsystemNonOverheadPercentage($info_video['bitrate'], $getid3->info['audio']['bitrate']);
//switch ($info_video['bitrate']) {
// case('5000000'):
// $multiplier = 0.93292642112380355828048824319889;
// break;
// case('5500000'):
// $multiplier = 0.93582895375200989965359777343219;
// break;
// case('6000000'):
// $multiplier = 0.93796247714820932532911373859139;
// break;
// case('7000000'):
// $multiplier = 0.9413264083635103463010117778776;
// break;
// default:
// $multiplier = 1;
// break;
//}
//$getid3->info['playtime_seconds'] *= $multiplier;
//$getid3->warning('Interleaved MPEG audio/video playtime may be inaccurate. With current hack should be within a few seconds of accurate. Report to info@getid3.org if off by more than 10 seconds.');
if ($info_video['bitrate'] < 50000) {
$getid3->warning('Interleaved MPEG audio/video playtime may be slightly inaccurate for video bitrates below 100kbps. Except in extreme low-bitrate situations, error should be less than 1%. Report to info@getid3.org if greater than this.');
}
}
return true;
}
public function getOnlyMPEGaudioInfo($fd, &$info, $avdata_offset, $bit_rate_histogram = false)
{
// looks for synch, decodes MPEG audio header
fseek($fd, $avdata_offset, SEEK_SET);
$sync_seek_buffer_size = min(128 * 1024, $info['avdataend'] - $avdata_offset);
$header = fread($fd, $sync_seek_buffer_size);
$sync_seek_buffer_size = strlen($header);
$synch_seek_offset = 0;
static $mpeg_audio_version_lookup;
static $mpeg_audio_layer_lookup;
static $mpeg_audio_bitrate_lookup;
if (empty($mpeg_audio_version_lookup)) {
$mpeg_audio_version_lookup = getid3_mp3::MPEGaudioVersionarray();
$mpeg_audio_layer_lookup = getid3_mp3::MPEGaudioLayerarray();
$mpeg_audio_bitrate_lookup = getid3_mp3::MPEGaudioBitratearray();
}
while ($synch_seek_offset < $sync_seek_buffer_size) {
if ($avdata_offset + $synch_seek_offset < $info['avdataend'] && !feof($fd)) {
// if a synch's not found within the first 128k bytes, then give up
if ($synch_seek_offset > $sync_seek_buffer_size) {
throw new getid3_exception('Could not find valid MPEG audio synch within the first ' . round($sync_seek_buffer_size / 1024) . 'kB');
}
if (feof($fd)) {
throw new getid3_exception('Could not find valid MPEG audio synch before end of file');
}
}
if ($synch_seek_offset + 1 >= strlen($header)) {
throw new getid3_exception('Could not find valid MPEG synch before end of file');
}
if ($header[$synch_seek_offset] == "ÿ" && $header[$synch_seek_offset + 1] > "à") {
// synch detected
if (!isset($first_frame_info) && !isset($info['mpeg']['audio'])) {
$first_frame_info = $info;
$first_frame_avdata_offset = $avdata_offset + $synch_seek_offset;
if (!getid3_mp3::decodeMPEGaudioHeader($fd, $avdata_offset + $synch_seek_offset, $first_frame_info, false)) {
// if this is the first valid MPEG-audio frame, save it in case it's a VBR header frame and there's
// garbage between this frame and a valid sequence of MPEG-audio frames, to be restored below
unset($first_frame_info);
}
}
$dummy = $info;
// only overwrite real data if valid header found
if (getid3_mp3::decodeMPEGaudioHeader($fd, $avdata_offset + $synch_seek_offset, $dummy, true)) {
$info = $dummy;
$info['avdataoffset'] = $avdata_offset + $synch_seek_offset;
switch (@$info['fileformat']) {
case '':
case 'mp3':
$info['fileformat'] = 'mp3';
$info['audio']['dataformat'] = 'mp3';
break;
}
if (isset($first_frame_info['mpeg']['audio']['bitrate_mode']) && $first_frame_info['mpeg']['audio']['bitrate_mode'] == 'vbr') {
if (!(abs($info['audio']['bitrate'] - $first_frame_info['audio']['bitrate']) <= 1)) {
// If there is garbage data between a valid VBR header frame and a sequence
// of valid MPEG-audio frames the VBR data is no longer discarded.
$info = $first_frame_info;
$info['avdataoffset'] = $first_frame_avdata_offset;
$info['fileformat'] = 'mp3';
$info['audio']['dataformat'] = 'mp3';
$dummy = $info;
unset($dummy['mpeg']['audio']);
$GarbageOffsetStart = $first_frame_avdata_offset + $first_frame_info['mpeg']['audio']['framelength'];
$GarbageOffsetEnd = $avdata_offset + $synch_seek_offset;
if (getid3_mp3::decodeMPEGaudioHeader($fd, $GarbageOffsetEnd, $dummy, true, true)) {
$info = $dummy;
$info['avdataoffset'] = $GarbageOffsetEnd;
$this->getid3->warning('apparently-valid VBR header not used because could not find ' . getid3_mp3::VALID_CHECK_FRAMES . ' consecutive MPEG-audio frames immediately after VBR header (garbage data for ' . ($GarbageOffsetEnd - $GarbageOffsetStart) . ' bytes between ' . $GarbageOffsetStart . ' and ' . $GarbageOffsetEnd . '), but did find valid CBR stream starting at ' . $GarbageOffsetEnd);
} else {
$this->getid3->warning('using data from VBR header even though could not find ' . getid3_mp3::VALID_CHECK_FRAMES . ' consecutive MPEG-audio frames immediately after VBR header (garbage data for ' . ($GarbageOffsetEnd - $GarbageOffsetStart) . ' bytes between ' . $GarbageOffsetStart . ' and ' . $GarbageOffsetEnd . ')');
}
}
}
if (isset($info['mpeg']['audio']['bitrate_mode']) && $info['mpeg']['audio']['bitrate_mode'] == 'vbr' && !isset($info['mpeg']['audio']['VBR_method'])) {
// VBR file with no VBR header
$bit_rate_histogram = true;
}
if ($bit_rate_histogram) {
$info['mpeg']['audio']['stereo_distribution'] = array('stereo' => 0, 'joint stereo' => 0, 'dual channel' => 0, 'mono' => 0);
$info['mpeg']['audio']['version_distribution'] = array('1' => 0, '2' => 0, '2.5' => 0);
if ($info['mpeg']['audio']['version'] == '1') {
if ($info['mpeg']['audio']['layer'] == 3) {
$info['mpeg']['audio']['bitrate_distribution'] = array('free' => 0, 32000 => 0, 40000 => 0, 48000 => 0, 56000 => 0, 64000 => 0, 80000 => 0, 96000 => 0, 112000 => 0, 128000 => 0, 160000 => 0, 192000 => 0, 224000 => 0, 256000 => 0, 320000 => 0);
} elseif ($info['mpeg']['audio']['layer'] == 2) {
$info['mpeg']['audio']['bitrate_distribution'] = array('free' => 0, 32000 => 0, 48000 => 0, 56000 => 0, 64000 => 0, 80000 => 0, 96000 => 0, 112000 => 0, 128000 => 0, 160000 => 0, 192000 => 0, 224000 => 0, 256000 => 0, 320000 => 0, 384000 => 0);
} elseif ($info['mpeg']['audio']['layer'] == 1) {
$info['mpeg']['audio']['bitrate_distribution'] = array('free' => 0, 32000 => 0, 64000 => 0, 96000 => 0, 128000 => 0, 160000 => 0, 192000 => 0, 224000 => 0, 256000 => 0, 288000 => 0, 320000 => 0, 352000 => 0, 384000 => 0, 416000 => 0, 448000 => 0);
}
} elseif ($info['mpeg']['audio']['layer'] == 1) {
$info['mpeg']['audio']['bitrate_distribution'] = array('free' => 0, 32000 => 0, 48000 => 0, 56000 => 0, 64000 => 0, 80000 => 0, 96000 => 0, 112000 => 0, 128000 => 0, 144000 => 0, 160000 => 0, 176000 => 0, 192000 => 0, 224000 => 0, 256000 => 0);
} else {
$info['mpeg']['audio']['bitrate_distribution'] = array('free' => 0, 8000 => 0, 16000 => 0, 24000 => 0, 32000 => 0, 40000 => 0, 48000 => 0, 56000 => 0, 64000 => 0, 80000 => 0, 96000 => 0, 112000 => 0, 128000 => 0, 144000 => 0, 160000 => 0);
}
$dummy = array('avdataend' => $info['avdataend'], 'avdataoffset' => $info['avdataoffset']);
$synch_start_offset = $info['avdataoffset'];
$fast_mode = false;
$synch_errors_found = 0;
while ($this->decodeMPEGaudioHeader($fd, $synch_start_offset, $dummy, false, false, $fast_mode)) {
$fast_mode = true;
$thisframebitrate = $mpeg_audio_bitrate_lookup[$mpeg_audio_version_lookup[$dummy['mpeg']['audio']['raw']['version']]][$mpeg_audio_layer_lookup[$dummy['mpeg']['audio']['raw']['layer']]][$dummy['mpeg']['audio']['raw']['bitrate']];
if (empty($dummy['mpeg']['audio']['framelength'])) {
$synch_errors_found++;
} else {
@$info['mpeg']['audio']['bitrate_distribution'][$thisframebitrate]++;
@$info['mpeg']['audio']['stereo_distribution'][$dummy['mpeg']['audio']['channelmode']]++;
@$info['mpeg']['audio']['version_distribution'][$dummy['mpeg']['audio']['version']]++;
$synch_start_offset += $dummy['mpeg']['audio']['framelength'];
}
}
if ($synch_errors_found > 0) {
$this->getid3->warning('Found ' . $synch_errors_found . ' synch errors in histogram analysis');
}
$bit_total = 0;
$frame_counter = 0;
foreach ($info['mpeg']['audio']['bitrate_distribution'] as $bit_rate_value => $bit_rate_count) {
$frame_counter += $bit_rate_count;
if ($bit_rate_value != 'free') {
$bit_total += $bit_rate_value * $bit_rate_count;
}
}
if ($frame_counter == 0) {
throw new getid3_exception('Corrupt MP3 file: framecounter == zero');
}
$info['mpeg']['audio']['frame_count'] = $frame_counter;
$info['mpeg']['audio']['bitrate'] = $bit_total / $frame_counter;
$info['audio']['bitrate'] = $info['mpeg']['audio']['bitrate'];
// Definitively set VBR vs CBR, even if the Xing/LAME/VBRI header says differently
$distinct_bit_rates = 0;
foreach ($info['mpeg']['audio']['bitrate_distribution'] as $bit_rate_value => $bit_rate_count) {
if ($bit_rate_count > 0) {
$distinct_bit_rates++;
}
}
if ($distinct_bit_rates > 1) {
$info['mpeg']['audio']['bitrate_mode'] = 'vbr';
} else {
$info['mpeg']['audio']['bitrate_mode'] = 'cbr';
}
$info['audio']['bitrate_mode'] = $info['mpeg']['audio']['bitrate_mode'];
}
break;
// exit while()
}
}
$synch_seek_offset++;
if ($avdata_offset + $synch_seek_offset >= $info['avdataend']) {
// end of file/data
if (empty($info['mpeg']['audio'])) {
throw new getid3_exception('could not find valid MPEG synch before end of file');
}
break;
}
}
$info['audio']['channels'] = $info['mpeg']['audio']['channels'];
$info['audio']['channelmode'] = $info['mpeg']['audio']['channelmode'];
$info['audio']['sample_rate'] = $info['mpeg']['audio']['sample_rate'];
return true;
}
function getOnlyMPEGaudioInfo($fd, &$ThisFileInfo, $avdataoffset, $BitrateHistogram = false)
{
// looks for synch, decodes MPEG audio header
fseek($fd, $avdataoffset, SEEK_SET);
$header = '';
$SynchSeekOffset = 0;
static $MPEGaudioVersionLookup;
static $MPEGaudioLayerLookup;
static $MPEGaudioBitrateLookup;
if (empty($MPEGaudioVersionLookup)) {
$MPEGaudioVersionLookup = getid3_mp3::MPEGaudioVersionArray();
$MPEGaudioLayerLookup = getid3_mp3::MPEGaudioLayerArray();
$MPEGaudioBitrateLookup = getid3_mp3::MPEGaudioBitrateArray();
}
$header_len = strlen($header) - round(GETID3_FREAD_BUFFER_SIZE / 2);
while (true) {
if ($SynchSeekOffset > $header_len && $avdataoffset + $SynchSeekOffset < $ThisFileInfo['avdataend'] && !feof($fd)) {
if ($SynchSeekOffset > 131072) {
// if a synch's not found within the first 128k bytes, then give up
$ThisFileInfo['error'][] = 'could not find valid MPEG audio synch within the first 128k bytes';
if (isset($ThisFileInfo['audio']['bitrate'])) {
unset($ThisFileInfo['audio']['bitrate']);
}
if (isset($ThisFileInfo['mpeg']['audio'])) {
unset($ThisFileInfo['mpeg']['audio']);
}
if (empty($ThisFileInfo['mpeg'])) {
unset($ThisFileInfo['mpeg']);
}
return false;
} elseif ($header .= fread($fd, GETID3_FREAD_BUFFER_SIZE)) {
// great
$header_len = strlen($header) - round(GETID3_FREAD_BUFFER_SIZE / 2);
} else {
$ThisFileInfo['error'][] = 'could not find valid MPEG audio synch before end of file';
if (isset($ThisFileInfo['audio']['bitrate'])) {
unset($ThisFileInfo['audio']['bitrate']);
}
if (isset($ThisFileInfo['mpeg']['audio'])) {
unset($ThisFileInfo['mpeg']['audio']);
}
if (isset($ThisFileInfo['mpeg']) && (!is_array($ThisFileInfo['mpeg']) || count($ThisFileInfo['mpeg']) == 0)) {
unset($ThisFileInfo['mpeg']);
}
return false;
}
}
if ($SynchSeekOffset + 1 >= strlen($header)) {
$ThisFileInfo['error'][] = 'could not find valid MPEG synch before end of file';
return false;
}
if ($header[$SynchSeekOffset] == "ÿ" && $header[$SynchSeekOffset + 1] > "à") {
// synch detected
if (!isset($FirstFrameThisfileInfo) && !isset($ThisFileInfo['mpeg']['audio'])) {
$FirstFrameThisfileInfo = $ThisFileInfo;
$FirstFrameAVDataOffset = $avdataoffset + $SynchSeekOffset;
if (!getid3_mp3::decodeMPEGaudioHeader($fd, $avdataoffset + $SynchSeekOffset, $FirstFrameThisfileInfo, false)) {
// if this is the first valid MPEG-audio frame, save it in case it's a VBR header frame and there's
// garbage between this frame and a valid sequence of MPEG-audio frames, to be restored below
unset($FirstFrameThisfileInfo);
}
}
$dummy = $ThisFileInfo;
// only overwrite real data if valid header found
if (getid3_mp3::decodeMPEGaudioHeader($fd, $avdataoffset + $SynchSeekOffset, $dummy, true)) {
$ThisFileInfo = $dummy;
$ThisFileInfo['avdataoffset'] = $avdataoffset + $SynchSeekOffset;
switch ($ThisFileInfo['fileformat']) {
case '':
case 'id3':
case 'ape':
case 'mp3':
$ThisFileInfo['fileformat'] = 'mp3';
$ThisFileInfo['audio']['dataformat'] = 'mp3';
break;
}
if (isset($FirstFrameThisfileInfo['mpeg']['audio']['bitrate_mode']) && $FirstFrameThisfileInfo['mpeg']['audio']['bitrate_mode'] == 'vbr') {
if (!(abs($ThisFileInfo['audio']['bitrate'] - $FirstFrameThisfileInfo['audio']['bitrate']) <= 1)) {
// If there is garbage data between a valid VBR header frame and a sequence
// of valid MPEG-audio frames the VBR data is no longer discarded.
$ThisFileInfo = $FirstFrameThisfileInfo;
$ThisFileInfo['avdataoffset'] = $FirstFrameAVDataOffset;
$ThisFileInfo['fileformat'] = 'mp3';
$ThisFileInfo['audio']['dataformat'] = 'mp3';
$dummy = $ThisFileInfo;
unset($dummy['mpeg']['audio']);
$GarbageOffsetStart = $FirstFrameAVDataOffset + $FirstFrameThisfileInfo['mpeg']['audio']['framelength'];
$GarbageOffsetEnd = $avdataoffset + $SynchSeekOffset;
if (getid3_mp3::decodeMPEGaudioHeader($fd, $GarbageOffsetEnd, $dummy, true, true)) {
$ThisFileInfo = $dummy;
$ThisFileInfo['avdataoffset'] = $GarbageOffsetEnd;
$ThisFileInfo['warning'][] = 'apparently-valid VBR header not used because could not find ' . GETID3_MP3_VALID_CHECK_FRAMES . ' consecutive MPEG-audio frames immediately after VBR header (garbage data for ' . ($GarbageOffsetEnd - $GarbageOffsetStart) . ' bytes between ' . $GarbageOffsetStart . ' and ' . $GarbageOffsetEnd . '), but did find valid CBR stream starting at ' . $GarbageOffsetEnd;
} else {
$ThisFileInfo['warning'][] = 'using data from VBR header even though could not find ' . GETID3_MP3_VALID_CHECK_FRAMES . ' consecutive MPEG-audio frames immediately after VBR header (garbage data for ' . ($GarbageOffsetEnd - $GarbageOffsetStart) . ' bytes between ' . $GarbageOffsetStart . ' and ' . $GarbageOffsetEnd . ')';
}
}
}
if (isset($ThisFileInfo['mpeg']['audio']['bitrate_mode']) && $ThisFileInfo['mpeg']['audio']['bitrate_mode'] == 'vbr' && !isset($ThisFileInfo['mpeg']['audio']['VBR_method'])) {
// VBR file with no VBR header
$BitrateHistogram = true;
}
if ($BitrateHistogram) {
$ThisFileInfo['mpeg']['audio']['stereo_distribution'] = array('stereo' => 0, 'joint stereo' => 0, 'dual channel' => 0, 'mono' => 0);
$ThisFileInfo['mpeg']['audio']['version_distribution'] = array('1' => 0, '2' => 0, '2.5' => 0);
if ($ThisFileInfo['mpeg']['audio']['version'] == '1') {
if ($ThisFileInfo['mpeg']['audio']['layer'] == 3) {
$ThisFileInfo['mpeg']['audio']['bitrate_distribution'] = array('free' => 0, 32000 => 0, 40000 => 0, 48000 => 0, 56000 => 0, 64000 => 0, 80000 => 0, 96000 => 0, 112000 => 0, 128000 => 0, 160000 => 0, 192000 => 0, 224000 => 0, 256000 => 0, 320000 => 0);
} elseif ($ThisFileInfo['mpeg']['audio']['layer'] == 2) {
$ThisFileInfo['mpeg']['audio']['bitrate_distribution'] = array('free' => 0, 32000 => 0, 48000 => 0, 56000 => 0, 64000 => 0, 80000 => 0, 96000 => 0, 112000 => 0, 128000 => 0, 160000 => 0, 192000 => 0, 224000 => 0, 256000 => 0, 320000 => 0, 384000 => 0);
} elseif ($ThisFileInfo['mpeg']['audio']['layer'] == 1) {
$ThisFileInfo['mpeg']['audio']['bitrate_distribution'] = array('free' => 0, 32000 => 0, 64000 => 0, 96000 => 0, 128000 => 0, 160000 => 0, 192000 => 0, 224000 => 0, 256000 => 0, 288000 => 0, 320000 => 0, 352000 => 0, 384000 => 0, 416000 => 0, 448000 => 0);
}
} elseif ($ThisFileInfo['mpeg']['audio']['layer'] == 1) {
$ThisFileInfo['mpeg']['audio']['bitrate_distribution'] = array('free' => 0, 32000 => 0, 48000 => 0, 56000 => 0, 64000 => 0, 80000 => 0, 96000 => 0, 112000 => 0, 128000 => 0, 144000 => 0, 160000 => 0, 176000 => 0, 192000 => 0, 224000 => 0, 256000 => 0);
} else {
$ThisFileInfo['mpeg']['audio']['bitrate_distribution'] = array('free' => 0, 8000 => 0, 16000 => 0, 24000 => 0, 32000 => 0, 40000 => 0, 48000 => 0, 56000 => 0, 64000 => 0, 80000 => 0, 96000 => 0, 112000 => 0, 128000 => 0, 144000 => 0, 160000 => 0);
}
$dummy = array('error' => $ThisFileInfo['error'], 'warning' => $ThisFileInfo['warning'], 'avdataend' => $ThisFileInfo['avdataend'], 'avdataoffset' => $ThisFileInfo['avdataoffset']);
$synchstartoffset = $ThisFileInfo['avdataoffset'];
$FastMode = false;
$SynchErrorsFound = 0;
while (getid3_mp3::decodeMPEGaudioHeader($fd, $synchstartoffset, $dummy, false, false, $FastMode)) {
$FastMode = true;
$thisframebitrate = $MPEGaudioBitrateLookup[$MPEGaudioVersionLookup[$dummy['mpeg']['audio']['raw']['version']]][$MPEGaudioLayerLookup[$dummy['mpeg']['audio']['raw']['layer']]][$dummy['mpeg']['audio']['raw']['bitrate']];
if (empty($dummy['mpeg']['audio']['framelength'])) {
$SynchErrorsFound++;
} else {
$ThisFileInfo['mpeg']['audio']['bitrate_distribution'][$thisframebitrate]++;
$ThisFileInfo['mpeg']['audio']['stereo_distribution'][$dummy['mpeg']['audio']['channelmode']]++;
$ThisFileInfo['mpeg']['audio']['version_distribution'][$dummy['mpeg']['audio']['version']]++;
$synchstartoffset += $dummy['mpeg']['audio']['framelength'];
}
}
if ($SynchErrorsFound > 0) {
$ThisFileInfo['warning'][] = 'Found ' . $SynchErrorsFound . ' synch errors in histogram analysis';
//return false;
}
$bittotal = 0;
$framecounter = 0;
foreach ($ThisFileInfo['mpeg']['audio']['bitrate_distribution'] as $bitratevalue => $bitratecount) {
$framecounter += $bitratecount;
if ($bitratevalue != 'free') {
$bittotal += $bitratevalue * $bitratecount;
}
}
if ($framecounter == 0) {
$ThisFileInfo['error'][] = 'Corrupt MP3 file: framecounter == zero';
return false;
}
$ThisFileInfo['mpeg']['audio']['frame_count'] = $framecounter;
$ThisFileInfo['mpeg']['audio']['bitrate'] = $bittotal / $framecounter;
$ThisFileInfo['audio']['bitrate'] = $ThisFileInfo['mpeg']['audio']['bitrate'];
// Definitively set VBR vs CBR, even if the Xing/LAME/VBRI header says differently
$distinct_bitrates = 0;
foreach ($ThisFileInfo['mpeg']['audio']['bitrate_distribution'] as $bitrate_value => $bitrate_count) {
if ($bitrate_count > 0) {
$distinct_bitrates++;
}
}
if ($distinct_bitrates > 1) {
$ThisFileInfo['mpeg']['audio']['bitrate_mode'] = 'vbr';
} else {
$ThisFileInfo['mpeg']['audio']['bitrate_mode'] = 'cbr';
}
$ThisFileInfo['audio']['bitrate_mode'] = $ThisFileInfo['mpeg']['audio']['bitrate_mode'];
}
break;
// exit while()
}
}
$SynchSeekOffset++;
if ($avdataoffset + $SynchSeekOffset >= $ThisFileInfo['avdataend']) {
// end of file/data
if (empty($ThisFileInfo['mpeg']['audio'])) {
$ThisFileInfo['error'][] = 'could not find valid MPEG synch before end of file';
if (isset($ThisFileInfo['audio']['bitrate'])) {
unset($ThisFileInfo['audio']['bitrate']);
}
if (isset($ThisFileInfo['mpeg']['audio'])) {
unset($ThisFileInfo['mpeg']['audio']);
}
if (isset($ThisFileInfo['mpeg']) && (!is_array($ThisFileInfo['mpeg']) || empty($ThisFileInfo['mpeg']))) {
unset($ThisFileInfo['mpeg']);
}
return false;
}
break;
}
}
$ThisFileInfo['audio']['channels'] = $ThisFileInfo['mpeg']['audio']['channels'];
$ThisFileInfo['audio']['channelmode'] = $ThisFileInfo['mpeg']['audio']['channelmode'];
$ThisFileInfo['audio']['sample_rate'] = $ThisFileInfo['mpeg']['audio']['sample_rate'];
return true;
}
public function Analyze()
{
$info =& $this->getid3->info;
$info['fileformat'] = 'mpeg';
$this->fseek($info['avdataoffset']);
$MPEGstreamData = $this->fread($this->getid3->option_fread_buffer_size);
$MPEGstreamBaseOffset = 0;
// how far are we from the beginning of the file data ($info['avdataoffset'])
$MPEGstreamDataOffset = 0;
// how far are we from the beginning of the buffer data (~32kB)
$StartCodeValue = false;
$prevStartCodeValue = false;
$GOPcounter = -1;
$FramesByGOP = array();
$ParsedAVchannels = array();
do {
//echo $MPEGstreamDataOffset.' vs '.(strlen($MPEGstreamData) - 1024).'<Br>';
if ($MPEGstreamDataOffset > strlen($MPEGstreamData) - 16384) {
// buffer running low, get more data
//echo 'reading more data<br>';
$MPEGstreamData .= $this->fread($this->getid3->option_fread_buffer_size);
if (strlen($MPEGstreamData) > $this->getid3->option_fread_buffer_size) {
$MPEGstreamData = substr($MPEGstreamData, $MPEGstreamDataOffset);
$MPEGstreamBaseOffset += $MPEGstreamDataOffset;
$MPEGstreamDataOffset = 0;
}
}
if (($StartCodeOffset = strpos($MPEGstreamData, self::START_CODE_BASE, $MPEGstreamDataOffset)) === false) {
//echo 'no more start codes found.<br>';
break;
} else {
$MPEGstreamDataOffset = $StartCodeOffset;
$prevStartCodeValue = $StartCodeValue;
$StartCodeValue = ord(substr($MPEGstreamData, $StartCodeOffset + 3, 1));
//echo 'Found "'.strtoupper(dechex($StartCodeValue)).'" at offset '.($MPEGstreamBaseOffset + $StartCodeOffset).' ($MPEGstreamDataOffset = '.$MPEGstreamDataOffset.')<br>';
}
$MPEGstreamDataOffset += 4;
switch ($StartCodeValue) {
case 0x0:
// picture_start_code
if ($info['mpeg']['video']['bitrate_mode'] == 'vbr') {
$bitstream = getid3_lib::BigEndian2Bin(substr($MPEGstreamData, $StartCodeOffset + 4, 4));
$bitstreamoffset = 0;
$PictureHeader = array();
$PictureHeader['temporal_reference'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 10);
// 10-bit unsigned integer associated with each input picture. It is incremented by one, modulo 1024, for each input frame. When a frame is coded as two fields the temporal reference in the picture header of both fields is the same. Following a group start header the temporal reference of the earliest picture (in display order) shall be reset to zero.
$PictureHeader['picture_coding_type'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 3);
// 3 bits for picture_coding_type
$PictureHeader['vbv_delay'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 16);
// 16 bits for vbv_delay
//... etc
$FramesByGOP[$GOPcounter][] = $PictureHeader;
}
break;
case 0xb3:
// sequence_header_code
/*
Note: purposely doing the less-pretty (and probably a bit slower) method of using string of bits rather than bitwise operations.
Mostly because PHP 32-bit doesn't handle unsigned integers well for bitwise operation.
Also the MPEG stream is designed as a bitstream and often doesn't align nicely with byte boundaries.
*/
$info['video']['codec'] = 'MPEG-1';
// will be updated if extension_start_code found
$bitstream = getid3_lib::BigEndian2Bin(substr($MPEGstreamData, $StartCodeOffset + 4, 8));
$bitstreamoffset = 0;
$info['mpeg']['video']['raw']['horizontal_size_value'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 12);
// 12 bits for horizontal frame size. Note: horizontal_size_extension, if present, will add 2 most-significant bits to this value
$info['mpeg']['video']['raw']['vertical_size_value'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 12);
// 12 bits for vertical frame size. Note: vertical_size_extension, if present, will add 2 most-significant bits to this value
$info['mpeg']['video']['raw']['aspect_ratio_information'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 4);
// 4 bits for aspect_ratio_information
$info['mpeg']['video']['raw']['frame_rate_code'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 4);
// 4 bits for Frame Rate id code
$info['mpeg']['video']['raw']['bitrate'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 18);
// 18 bits for bit_rate_value (18 set bits = VBR, otherwise bitrate = this value * 400)
$marker_bit = self::readBitsFromStream($bitstream, $bitstreamoffset, 1);
// The term "marker_bit" indicates a one bit field in which the value zero is forbidden. These marker bits are introduced at several points in the syntax to avoid start code emulation.
$info['mpeg']['video']['raw']['vbv_buffer_size'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 10);
// 10 bits vbv_buffer_size_value
$info['mpeg']['video']['raw']['constrained_param_flag'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1);
// 1 bit flag: constrained_param_flag
$info['mpeg']['video']['raw']['load_intra_quantiser_matrix'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1);
// 1 bit flag: load_intra_quantiser_matrix
if ($info['mpeg']['video']['raw']['load_intra_quantiser_matrix']) {
$bitstream .= getid3_lib::BigEndian2Bin(substr($MPEGstreamData, $StartCodeOffset + 12, 64));
for ($i = 0; $i < 64; $i++) {
$info['mpeg']['video']['raw']['intra_quantiser_matrix'][$i] = self::readBitsFromStream($bitstream, $bitstreamoffset, 8);
}
}
$info['mpeg']['video']['raw']['load_non_intra_quantiser_matrix'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1);
if ($info['mpeg']['video']['raw']['load_non_intra_quantiser_matrix']) {
$bitstream .= getid3_lib::BigEndian2Bin(substr($MPEGstreamData, $StartCodeOffset + 12 + ($info['mpeg']['video']['raw']['load_intra_quantiser_matrix'] ? 64 : 0), 64));
for ($i = 0; $i < 64; $i++) {
$info['mpeg']['video']['raw']['non_intra_quantiser_matrix'][$i] = self::readBitsFromStream($bitstream, $bitstreamoffset, 8);
}
}
$info['mpeg']['video']['pixel_aspect_ratio'] = self::videoAspectRatioLookup($info['mpeg']['video']['raw']['aspect_ratio_information']);
$info['mpeg']['video']['pixel_aspect_ratio_text'] = self::videoAspectRatioTextLookup($info['mpeg']['video']['raw']['aspect_ratio_information']);
$info['mpeg']['video']['frame_rate'] = self::videoFramerateLookup($info['mpeg']['video']['raw']['frame_rate_code']);
if ($info['mpeg']['video']['raw']['bitrate'] == 0x3ffff) {
// 18 set bits = VBR
//$this->warning('This version of getID3() ['.$this->getid3->version().'] cannot determine average bitrate of VBR MPEG video files');
$info['mpeg']['video']['bitrate_mode'] = 'vbr';
} else {
$info['mpeg']['video']['bitrate'] = $info['mpeg']['video']['raw']['bitrate'] * 400;
$info['mpeg']['video']['bitrate_mode'] = 'cbr';
$info['video']['bitrate'] = $info['mpeg']['video']['bitrate'];
}
$info['video']['resolution_x'] = $info['mpeg']['video']['raw']['horizontal_size_value'];
$info['video']['resolution_y'] = $info['mpeg']['video']['raw']['vertical_size_value'];
$info['video']['frame_rate'] = $info['mpeg']['video']['frame_rate'];
$info['video']['bitrate_mode'] = $info['mpeg']['video']['bitrate_mode'];
$info['video']['pixel_aspect_ratio'] = $info['mpeg']['video']['pixel_aspect_ratio'];
$info['video']['lossless'] = false;
$info['video']['bits_per_sample'] = 24;
break;
case 0xb5:
// extension_start_code
$info['video']['codec'] = 'MPEG-2';
$bitstream = getid3_lib::BigEndian2Bin(substr($MPEGstreamData, $StartCodeOffset + 4, 8));
// 48 bits for Sequence Extension ID; 61 bits for Sequence Display Extension ID; 59 bits for Sequence Scalable Extension ID
$bitstreamoffset = 0;
$info['mpeg']['video']['raw']['extension_start_code_identifier'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 4);
// 4 bits for extension_start_code_identifier
//echo $info['mpeg']['video']['raw']['extension_start_code_identifier'].'<br>';
switch ($info['mpeg']['video']['raw']['extension_start_code_identifier']) {
case 1:
// 0001 Sequence Extension ID
$info['mpeg']['video']['raw']['profile_and_level_indication'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 8);
// 8 bits for profile_and_level_indication
$info['mpeg']['video']['raw']['progressive_sequence'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1);
// 1 bit flag: progressive_sequence
$info['mpeg']['video']['raw']['chroma_format'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 2);
// 2 bits for chroma_format
$info['mpeg']['video']['raw']['horizontal_size_extension'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 2);
// 2 bits for horizontal_size_extension
$info['mpeg']['video']['raw']['vertical_size_extension'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 2);
// 2 bits for vertical_size_extension
$info['mpeg']['video']['raw']['bit_rate_extension'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 12);
// 12 bits for bit_rate_extension
$marker_bit = self::readBitsFromStream($bitstream, $bitstreamoffset, 1);
// The term "marker_bit" indicates a one bit field in which the value zero is forbidden. These marker bits are introduced at several points in the syntax to avoid start code emulation.
$info['mpeg']['video']['raw']['vbv_buffer_size_extension'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 8);
// 8 bits for vbv_buffer_size_extension
$info['mpeg']['video']['raw']['low_delay'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1);
// 1 bit flag: low_delay
$info['mpeg']['video']['raw']['frame_rate_extension_n'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 2);
// 2 bits for frame_rate_extension_n
$info['mpeg']['video']['raw']['frame_rate_extension_d'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 5);
// 5 bits for frame_rate_extension_d
$info['video']['resolution_x'] = $info['mpeg']['video']['raw']['horizontal_size_extension'] << 12 | $info['mpeg']['video']['raw']['horizontal_size_value'];
$info['video']['resolution_y'] = $info['mpeg']['video']['raw']['vertical_size_extension'] << 12 | $info['mpeg']['video']['raw']['vertical_size_value'];
$info['video']['interlaced'] = !$info['mpeg']['video']['raw']['progressive_sequence'];
$info['mpeg']['video']['interlaced'] = !$info['mpeg']['video']['raw']['progressive_sequence'];
$info['mpeg']['video']['chroma_format'] = self::chromaFormatTextLookup($info['mpeg']['video']['raw']['chroma_format']);
break;
case 2:
// 0010 Sequence Display Extension ID
$info['mpeg']['video']['raw']['video_format'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 3);
// 3 bits for video_format
$info['mpeg']['video']['raw']['colour_description'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1);
// 1 bit flag: colour_description
if ($info['mpeg']['video']['raw']['colour_description']) {
$info['mpeg']['video']['raw']['colour_primaries'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 8);
// 8 bits for colour_primaries
$info['mpeg']['video']['raw']['transfer_characteristics'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 8);
// 8 bits for transfer_characteristics
$info['mpeg']['video']['raw']['matrix_coefficients'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 8);
// 8 bits for matrix_coefficients
}
$info['mpeg']['video']['raw']['display_horizontal_size'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 14);
// 14 bits for display_horizontal_size
$marker_bit = self::readBitsFromStream($bitstream, $bitstreamoffset, 1);
// The term "marker_bit" indicates a one bit field in which the value zero is forbidden. These marker bits are introduced at several points in the syntax to avoid start code emulation.
$info['mpeg']['video']['raw']['display_vertical_size'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 14);
// 14 bits for display_vertical_size
$info['mpeg']['video']['video_format'] = self::videoFormatTextLookup($info['mpeg']['video']['raw']['video_format']);
break;
case 3:
// 0011 Quant Matrix Extension ID
break;
case 5:
// 0101 Sequence Scalable Extension ID
$info['mpeg']['video']['raw']['scalable_mode'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 2);
// 2 bits for scalable_mode
$info['mpeg']['video']['raw']['layer_id'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 4);
// 4 bits for layer_id
if ($info['mpeg']['video']['raw']['scalable_mode'] == 1) {
// "spatial scalability"
$info['mpeg']['video']['raw']['lower_layer_prediction_horizontal_size'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 14);
// 14 bits for lower_layer_prediction_horizontal_size
$marker_bit = self::readBitsFromStream($bitstream, $bitstreamoffset, 1);
// The term "marker_bit" indicates a one bit field in which the value zero is forbidden. These marker bits are introduced at several points in the syntax to avoid start code emulation.
$info['mpeg']['video']['raw']['lower_layer_prediction_vertical_size'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 14);
// 14 bits for lower_layer_prediction_vertical_size
$info['mpeg']['video']['raw']['horizontal_subsampling_factor_m'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 5);
// 5 bits for horizontal_subsampling_factor_m
$info['mpeg']['video']['raw']['horizontal_subsampling_factor_n'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 5);
// 5 bits for horizontal_subsampling_factor_n
$info['mpeg']['video']['raw']['vertical_subsampling_factor_m'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 5);
// 5 bits for vertical_subsampling_factor_m
$info['mpeg']['video']['raw']['vertical_subsampling_factor_n'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 5);
// 5 bits for vertical_subsampling_factor_n
} elseif ($info['mpeg']['video']['raw']['scalable_mode'] == 3) {
// "temporal scalability"
$info['mpeg']['video']['raw']['picture_mux_enable'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1);
// 1 bit flag: picture_mux_enable
if ($info['mpeg']['video']['raw']['picture_mux_enable']) {
$info['mpeg']['video']['raw']['mux_to_progressive_sequence'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1);
// 1 bit flag: mux_to_progressive_sequence
}
$info['mpeg']['video']['raw']['picture_mux_order'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 3);
// 3 bits for picture_mux_order
$info['mpeg']['video']['raw']['picture_mux_factor'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 3);
// 3 bits for picture_mux_factor
}
$info['mpeg']['video']['scalable_mode'] = self::scalableModeTextLookup($info['mpeg']['video']['raw']['scalable_mode']);
break;
case 7:
// 0111 Picture Display Extension ID
break;
case 8:
// 1000 Picture Coding Extension ID
$info['mpeg']['video']['raw']['f_code_00'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 4);
// 4 bits for f_code[0][0] (forward horizontal)
$info['mpeg']['video']['raw']['f_code_01'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 4);
// 4 bits for f_code[0][1] (forward vertical)
$info['mpeg']['video']['raw']['f_code_10'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 4);
// 4 bits for f_code[1][0] (backward horizontal)
$info['mpeg']['video']['raw']['f_code_11'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 4);
// 4 bits for f_code[1][1] (backward vertical)
$info['mpeg']['video']['raw']['intra_dc_precision'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 2);
// 2 bits for intra_dc_precision
$info['mpeg']['video']['raw']['picture_structure'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 2);
// 2 bits for picture_structure
$info['mpeg']['video']['raw']['top_field_first'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1);
// 1 bit flag: top_field_first
$info['mpeg']['video']['raw']['frame_pred_frame_dct'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1);
// 1 bit flag: frame_pred_frame_dct
$info['mpeg']['video']['raw']['concealment_motion_vectors'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1);
// 1 bit flag: concealment_motion_vectors
$info['mpeg']['video']['raw']['q_scale_type'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1);
// 1 bit flag: q_scale_type
$info['mpeg']['video']['raw']['intra_vlc_format'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1);
// 1 bit flag: intra_vlc_format
$info['mpeg']['video']['raw']['alternate_scan'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1);
// 1 bit flag: alternate_scan
$info['mpeg']['video']['raw']['repeat_first_field'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1);
// 1 bit flag: repeat_first_field
$info['mpeg']['video']['raw']['chroma_420_type'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1);
// 1 bit flag: chroma_420_type
$info['mpeg']['video']['raw']['progressive_frame'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1);
// 1 bit flag: progressive_frame
$info['mpeg']['video']['raw']['composite_display_flag'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1);
// 1 bit flag: composite_display_flag
if ($info['mpeg']['video']['raw']['composite_display_flag']) {
$info['mpeg']['video']['raw']['v_axis'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1);
// 1 bit flag: v_axis
$info['mpeg']['video']['raw']['field_sequence'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 3);
// 3 bits for field_sequence
$info['mpeg']['video']['raw']['sub_carrier'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1);
// 1 bit flag: sub_carrier
$info['mpeg']['video']['raw']['burst_amplitude'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 7);
// 7 bits for burst_amplitude
$info['mpeg']['video']['raw']['sub_carrier_phase'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 8);
// 8 bits for sub_carrier_phase
}
$info['mpeg']['video']['intra_dc_precision_bits'] = $info['mpeg']['video']['raw']['intra_dc_precision'] + 8;
$info['mpeg']['video']['picture_structure'] = self::pictureStructureTextLookup($info['mpeg']['video']['raw']['picture_structure']);
break;
case 9:
// 1001 Picture Spatial Scalable Extension ID
break;
case 10:
// 1010 Picture Temporal Scalable Extension ID
break;
default:
$this->warning('Unexpected $info[mpeg][video][raw][extension_start_code_identifier] value of ' . $info['mpeg']['video']['raw']['extension_start_code_identifier']);
break;
}
break;
case 0xb8:
// group_of_pictures_header
$GOPcounter++;
if ($info['mpeg']['video']['bitrate_mode'] == 'vbr') {
$bitstream = getid3_lib::BigEndian2Bin(substr($MPEGstreamData, $StartCodeOffset + 4, 4));
// 27 bits needed for group_of_pictures_header
$bitstreamoffset = 0;
$GOPheader = array();
$GOPheader['byte_offset'] = $MPEGstreamBaseOffset + $StartCodeOffset;
$GOPheader['drop_frame_flag'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1);
// 1 bit flag: drop_frame_flag
$GOPheader['time_code_hours'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 5);
// 5 bits for time_code_hours
$GOPheader['time_code_minutes'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 6);
// 6 bits for time_code_minutes
$marker_bit = self::readBitsFromStream($bitstream, $bitstreamoffset, 1);
// The term "marker_bit" indicates a one bit field in which the value zero is forbidden. These marker bits are introduced at several points in the syntax to avoid start code emulation.
$GOPheader['time_code_seconds'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 6);
// 6 bits for time_code_seconds
$GOPheader['time_code_pictures'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 6);
// 6 bits for time_code_pictures
$GOPheader['closed_gop'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1);
// 1 bit flag: closed_gop
$GOPheader['broken_link'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1);
// 1 bit flag: broken_link
$time_code_separator = $GOPheader['drop_frame_flag'] ? ';' : ':';
// While non-drop time code is displayed with colons separating the digit pairs—"HH:MM:SS:FF"—drop frame is usually represented with a semi-colon (;) or period (.) as the divider between all the digit pairs—"HH;MM;SS;FF", "HH.MM.SS.FF"
$GOPheader['time_code'] = sprintf('%02d' . $time_code_separator . '%02d' . $time_code_separator . '%02d' . $time_code_separator . '%02d', $GOPheader['time_code_hours'], $GOPheader['time_code_minutes'], $GOPheader['time_code_seconds'], $GOPheader['time_code_pictures']);
$info['mpeg']['group_of_pictures'][] = $GOPheader;
}
break;
case 0xc0:
// audio stream
// audio stream
case 0xc1:
// audio stream
// audio stream
case 0xc2:
// audio stream
// audio stream
case 0xc3:
// audio stream
// audio stream
case 0xc4:
// audio stream
// audio stream
case 0xc5:
// audio stream
// audio stream
case 0xc6:
// audio stream
// audio stream
case 0xc7:
// audio stream
// audio stream
case 0xc8:
// audio stream
// audio stream
case 0xc9:
// audio stream
// audio stream
case 0xca:
// audio stream
// audio stream
case 0xcb:
// audio stream
// audio stream
case 0xcc:
// audio stream
// audio stream
case 0xcd:
// audio stream
// audio stream
case 0xce:
// audio stream
// audio stream
case 0xcf:
// audio stream
// audio stream
case 0xd0:
// audio stream
// audio stream
case 0xd1:
// audio stream
// audio stream
case 0xd2:
// audio stream
// audio stream
case 0xd3:
// audio stream
// audio stream
case 0xd4:
// audio stream
// audio stream
case 0xd5:
// audio stream
// audio stream
case 0xd6:
// audio stream
// audio stream
case 0xd7:
// audio stream
// audio stream
case 0xd8:
// audio stream
// audio stream
case 0xd9:
// audio stream
// audio stream
case 0xda:
// audio stream
// audio stream
case 0xdb:
// audio stream
// audio stream
case 0xdc:
// audio stream
// audio stream
case 0xdd:
// audio stream
// audio stream
case 0xde:
// audio stream
// audio stream
case 0xdf:
// audio stream
//case 0xE0: // video stream
//case 0xE1: // video stream
//case 0xE2: // video stream
//case 0xE3: // video stream
//case 0xE4: // video stream
//case 0xE5: // video stream
//case 0xE6: // video stream
//case 0xE7: // video stream
//case 0xE8: // video stream
//case 0xE9: // video stream
//case 0xEA: // video stream
//case 0xEB: // video stream
//case 0xEC: // video stream
//case 0xED: // video stream
//case 0xEE: // video stream
//case 0xEF: // video stream
if (isset($ParsedAVchannels[$StartCodeValue])) {
break;
}
$ParsedAVchannels[$StartCodeValue] = $StartCodeValue;
// http://en.wikipedia.org/wiki/Packetized_elementary_stream
// http://dvd.sourceforge.net/dvdinfo/pes-hdr.html
/*
$PackedElementaryStream = array();
if ($StartCodeValue >= 0xE0) {
$PackedElementaryStream['stream_type'] = 'video';
$PackedElementaryStream['stream_id'] = $StartCodeValue - 0xE0;
} else {
$PackedElementaryStream['stream_type'] = 'audio';
$PackedElementaryStream['stream_id'] = $StartCodeValue - 0xC0;
}
$PackedElementaryStream['packet_length'] = getid3_lib::BigEndian2Int(substr($MPEGstreamData, $StartCodeOffset + 4, 2));
$bitstream = getid3_lib::BigEndian2Bin(substr($MPEGstreamData, $StartCodeOffset + 6, 3)); // more may be needed below
$bitstreamoffset = 0;
$PackedElementaryStream['marker_bits'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 2); // 2 bits for marker_bits -- should be "10" = 2
echo 'marker_bits = '.$PackedElementaryStream['marker_bits'].'<br>';
$PackedElementaryStream['scrambling_control'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 2); // 2 bits for scrambling_control -- 00 implies not scrambled
$PackedElementaryStream['priority'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1); // 1 bit flag: priority
$PackedElementaryStream['data_alignment_indicator'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1); // 1 bit flag: data_alignment_indicator -- 1 indicates that the PES packet header is immediately followed by the video start code or audio syncword
$PackedElementaryStream['copyright'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1); // 1 bit flag: copyright -- 1 implies copyrighted
$PackedElementaryStream['original_or_copy'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1); // 1 bit flag: original_or_copy -- 1 implies original
$PackedElementaryStream['pts_flag'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1); // 1 bit flag: pts_flag -- Presentation Time Stamp
$PackedElementaryStream['dts_flag'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1); // 1 bit flag: dts_flag -- Decode Time Stamp
$PackedElementaryStream['escr_flag'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1); // 1 bit flag: escr_flag -- Elementary Stream Clock Reference
$PackedElementaryStream['es_rate_flag'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1); // 1 bit flag: es_rate_flag -- Elementary Stream [data] Rate
$PackedElementaryStream['dsm_trick_mode_flag'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1); // 1 bit flag: dsm_trick_mode_flag -- DSM trick mode - not used by DVD
$PackedElementaryStream['additional_copy_info_flag'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1); // 1 bit flag: additional_copy_info_flag
$PackedElementaryStream['crc_flag'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1); // 1 bit flag: crc_flag
$PackedElementaryStream['extension_flag'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 1); // 1 bit flag: extension_flag
$PackedElementaryStream['pes_remain_header_length'] = self::readBitsFromStream($bitstream, $bitstreamoffset, 8); // 1 bit flag: priority
$additional_header_bytes = 0;
$additional_header_bytes += ($PackedElementaryStream['pts_flag'] ? 5 : 0);
$additional_header_bytes += ($PackedElementaryStream['dts_flag'] ? 5 : 0);
$additional_header_bytes += ($PackedElementaryStream['escr_flag'] ? 6 : 0);
$additional_header_bytes += ($PackedElementaryStream['es_rate_flag'] ? 3 : 0);
$additional_header_bytes += ($PackedElementaryStream['additional_copy_info_flag'] ? 1 : 0);
$additional_header_bytes += ($PackedElementaryStream['crc_flag'] ? 2 : 0);
$additional_header_bytes += ($PackedElementaryStream['extension_flag'] ? 1 : 0);
$PackedElementaryStream['additional_header_bytes'] = $additional_header_bytes;
$bitstream .= getid3_lib::BigEndian2Bin(substr($MPEGstreamData, $StartCodeOffset + 9, $additional_header_bytes));
$info['mpeg']['packed_elementary_streams'][$PackedElementaryStream['stream_type']][$PackedElementaryStream['stream_id']][] = $PackedElementaryStream;
*/
$getid3_temp = new getID3();
$getid3_temp->openfile($this->getid3->filename);
$getid3_temp->info = $info;
$getid3_mp3 = new getid3_mp3($getid3_temp);
for ($i = 0; $i <= 7; $i++) {
// some files have the MPEG-audio header 8 bytes after the end of the $00 $00 $01 $C0 signature, some have it up to 13 bytes (or more?) after
// I have no idea why or what the difference is, so this is a stupid hack.
// If anybody has any better idea of what's going on, please let me know - info@getid3.org
$getid3_temp->info = $info;
// only overwrite real data if valid header found
//echo 'audio at? '.($MPEGstreamBaseOffset + $StartCodeOffset + 4 + 8 + $i).'<br>';
if ($getid3_mp3->decodeMPEGaudioHeader($MPEGstreamBaseOffset + $StartCodeOffset + 4 + 8 + $i, $getid3_temp->info, false)) {
//echo 'yes!<br>';
$info = $getid3_temp->info;
$info['audio']['bitrate_mode'] = 'cbr';
$info['audio']['lossless'] = false;
break;
}
}
unset($getid3_temp, $getid3_mp3);
break;
case 0xbc:
// Program Stream Map
// Program Stream Map
case 0xbd:
// Private stream 1 (non MPEG audio, subpictures)
// Private stream 1 (non MPEG audio, subpictures)
case 0xbe:
// Padding stream
// Padding stream
case 0xbf:
// Private stream 2 (navigation data)
// Private stream 2 (navigation data)
case 0xf0:
// ECM stream
// ECM stream
case 0xf1:
// EMM stream
// EMM stream
case 0xf2:
// DSM-CC stream
// DSM-CC stream
case 0xf3:
// ISO/IEC_13522_stream
// ISO/IEC_13522_stream
case 0xf4:
// ITU-I Rec. H.222.1 type A
// ITU-I Rec. H.222.1 type A
case 0xf5:
// ITU-I Rec. H.222.1 type B
// ITU-I Rec. H.222.1 type B
case 0xf6:
// ITU-I Rec. H.222.1 type C
// ITU-I Rec. H.222.1 type C
case 0xf7:
// ITU-I Rec. H.222.1 type D
// ITU-I Rec. H.222.1 type D
case 0xf8:
// ITU-I Rec. H.222.1 type E
// ITU-I Rec. H.222.1 type E
case 0xf9:
// ancilliary stream
// ancilliary stream
case 0xfa:
// ISO/IEC 14496-1 SL-packtized stream
// ISO/IEC 14496-1 SL-packtized stream
case 0xfb:
// ISO/IEC 14496-1 FlexMux stream
// ISO/IEC 14496-1 FlexMux stream
case 0xfc:
// metadata stream
// metadata stream
case 0xfd:
// extended stream ID
// extended stream ID
case 0xfe:
// reserved data stream
// reserved data stream
case 0xff:
// program stream directory
// ignore
break;
default:
// ignore
break;
}
} while (true);
// // Temporary hack to account for interleaving overhead:
// if (!empty($info['video']['bitrate']) && !empty($info['audio']['bitrate'])) {
// $info['playtime_seconds'] = (($info['avdataend'] - $info['avdataoffset']) * 8) / ($info['video']['bitrate'] + $info['audio']['bitrate']);
//
// // Interleaved MPEG audio/video files have a certain amount of overhead that varies
// // by both video and audio bitrates, and not in any sensible, linear/logarithmic pattern
// // Use interpolated lookup tables to approximately guess how much is overhead, because
// // playtime is calculated as filesize / total-bitrate
// $info['playtime_seconds'] *= self::systemNonOverheadPercentage($info['video']['bitrate'], $info['audio']['bitrate']);
//
// //switch ($info['video']['bitrate']) {
// // case('5000000'):
// // $multiplier = 0.93292642112380355828048824319889;
// // break;
// // case('5500000'):
// // $multiplier = 0.93582895375200989965359777343219;
// // break;
// // case('6000000'):
// // $multiplier = 0.93796247714820932532911373859139;
// // break;
// // case('7000000'):
// // $multiplier = 0.9413264083635103463010117778776;
// // break;
// // default:
// // $multiplier = 1;
// // break;
// //}
// //$info['playtime_seconds'] *= $multiplier;
// //$info['warning'][] = 'Interleaved MPEG audio/video playtime may be inaccurate. With current hack should be within a few seconds of accurate. Report to info@getid3.org if off by more than 10 seconds.';
// if ($info['video']['bitrate'] < 50000) {
// $this->warning('Interleaved MPEG audio/video playtime may be slightly inaccurate for video bitrates below 100kbps. Except in extreme low-bitrate situations, error should be less than 1%. Report to info@getid3.org if greater than this.');
// }
// }
//
/*
$time_prev = 0;
$byte_prev = 0;
$vbr_bitrates = array();
foreach ($info['mpeg']['group_of_pictures'] as $gopkey => $gopdata) {
$time_this = ($gopdata['time_code_hours'] * 3600) + ($gopdata['time_code_minutes'] * 60) + $gopdata['time_code_seconds'] + ($gopdata['time_code_seconds'] / 30);
$byte_this = $gopdata['byte_offset'];
if ($gopkey > 0) {
if ($time_this > $time_prev) {
$bytedelta = $byte_this - $byte_prev;
$timedelta = $time_this - $time_prev;
$this_bitrate = ($bytedelta * 8) / $timedelta;
echo $gopkey.': ('.number_format($time_prev, 2).'-'.number_format($time_this, 2).') '.number_format($bytedelta).' bytes over '.number_format($timedelta, 3).' seconds = '.number_format($this_bitrate / 1000, 2).'kbps<br>';
$time_prev = $time_this;
$byte_prev = $byte_this;
$vbr_bitrates[] = $this_bitrate;
}
}
}
echo 'average_File_bitrate = '.number_format(array_sum($vbr_bitrates) / count($vbr_bitrates), 1).'<br>';
*/
//echo '<pre>'.print_r($FramesByGOP, true).'</pre>';
if ($info['mpeg']['video']['bitrate_mode'] == 'vbr') {
$last_GOP_id = max(array_keys($FramesByGOP));
$frames_in_last_GOP = count($FramesByGOP[$last_GOP_id]);
$gopdata =& $info['mpeg']['group_of_pictures'][$last_GOP_id];
$info['playtime_seconds'] = $gopdata['time_code_hours'] * 3600 + $gopdata['time_code_minutes'] * 60 + $gopdata['time_code_seconds'] + ($gopdata['time_code_pictures'] + $frames_in_last_GOP + 1) / $info['mpeg']['video']['frame_rate'];
if (!isset($info['video']['bitrate'])) {
$overall_bitrate = ($info['avdataend'] - $info['avdataoffset']) * 8 / $info['playtime_seconds'];
$info['video']['bitrate'] = $overall_bitrate - (isset($info['audio']['bitrate']) ? $info['audio']['bitrate'] : 0);
}
unset($info['mpeg']['group_of_pictures']);
}
return true;
}
