WAV PCM文件的最大優點在於，你無需進行任何綁定操作，就能將來自兩個文件的二進制音頻數據連接起來。你只需把其中一個文件的二進制數據粘合到另一個文件的末尾，再調整一下Subchunk2Size值，即可實現兩個文件的接合。唯一的缺點是這兩個文件的格式必須相同；在本例中，不涉及問題。 當解析音頻文件時，先將二進制音頻數據讀入一個緩沖數組中，然後再將另一個文件的數據讀到這個數組的末端。重復這一過程直到所有的文件都被讀取完畢。創建一個FILESTRUCT結構，填入格式信息，調整Subchunk2Size值，將Data成員設為緩沖數組，將FILESTRUCT寫為需要的輸出格式。對於基於PHP的Web發布系統，其輸出為標准輸出。以下為示范代碼： function StitchFiles(&$fsFile, &$sFiles) { $fsFiles = array(); //FILESTRUCT $lFileSize = 0; $lOffset = 0; $bData = array(); //byte for ($i = 0; $i < count($sFiles); $i++) { $fsFiles[$i] = new FILESTRUCT(); SetFile($fsFiles[$i], $sFiles[$i]); $lSize = CalcLittleEndianValue($fsFiles[$i]->Subchunk2Size); $lFileSize = $lFileSize + $lSize; $bData = array_merge($bData, $fsFiles[$i]->Data); $lOffset = $lOffset + $lSize; } $fsFile->ChunkID = $GLOBALS["ChunkID_"]; $fsFile->ChunkSize = GetLittleEndianByteArray(36 + $lFileSize); $fsFile->Format = $GLOBALS["FileFormat_"]; $fsFile->Subchunk1ID = $GLOBALS["Subchunk1ID_"]; $fsFile->Subchunk1Size = array(0x10, 0x0, 0x0, 0x0); $fsFile->AudioFormat = $GLOBALS["AudioFormat_"]; $fsFile->NumChannels = $GLOBALS["Stereo_"]; $fsFile->SampleRate = $GLOBALS["SampleRate_"]; $fsFile->ByteRate = GetLittleEndianByteArray( CalcLittleEndianValue($GLOBALS["SampleRate_"]) * CalcLittleEndianValue($GLOBALS["Stereo_"]) * (CalcLittleEndianValue($GLOBALS["BitsPerSample_"]) / 8)); $fsFile->BlockAlign = array_splice(GetLittleEndianByteArray(CalcLittleEndianValue($GLOBALS["Stereo_"] ) * (CalcLittleEndianValue($GLOBALS["BitsPerSample_"]) / 8)), 0, 2); $fsFile->BitsPerSample = $GLOBALS["BitsPerSample_"]; $fsFile->Subchunk2ID = $GLOBALS["Subchunk2ID_"]; $fsFile->Subchunk2Size = GetLittleEndianByteArray($lFileSize); $fsFile->Data = $bData; } 本調用的第一個參數是對FILESTRUCT對象的引用。第二個參數是對一列文件名字符串的引用。在每次for循環中，我都將列表中的一個文件名載入一個FILESTRUCT中，然後再將每一個FILESTRUCT的Data屬性提取出來，並合並到一個現有的緩沖區中。完成以上操作後，我通過一個事先聲明的全局變量對FILESTRUCT參數對象的屬性進行設定，然後改變Subchunk2Size屬性，並將Data屬性設為新的緩沖區。 你可能注意到，我使用了一些功能函數來填充FILESTRUCT結構、計算來自little endian字節數組的數值、創建little endian字節數組和拆分字符串為二進制數組。以下為這些函數： function SetFile(&$fsFile_, $sFileName) { $lSize = 1; if (file_exists($sFileName)) { $fil = fopen($sFileName, "rb"); $contents = fread($fil, count($fsFile_->ChunkID)); $fsFile_->ChunkID = bin_split($contents, 1); $contents = fread($fil, count($fsFile_->ChunkSize)); $fsFile_->ChunkSize = bin_split($contents, 1); $contents = fread($fil, count($fsFile_->Format)); $fsFile_->Format = bin_split($contents, 1); $contents = fread($fil, count($fsFile_->Subchunk1ID)); $fsFile_->Subchunk1ID = bin_split($contents, 1); $contents = fread($fil, count($fsFile_->Subchunk1Size)); $fsFile_->Subchunk1Size = bin_split($contents, 1); $contents = fread($fil, count($fsFile_->AudioFormat)); $fsFile_->AudioFormat = bin_split($contents, 1); $contents = fread($fil, count($fsFile_->NumChannels)); $fsFile_->NumChannels = bin_split($contents, 1); $contents = fread($fil, count($fsFile_->SampleRate)); $fsFile_->SampleRate = bin_split($contents, 1); $contents = fread($fil, count($fsFile_->ByteRate)); $fsFile_->ByteRate = bin_split($contents, 1); $contents = fread($fil, count($fsFile_->BlockAlign)); $fsFile_->BlockAlign = bin_split($contents, 1); $contents = fread($fil, count($fsFile_->BitsPerSample)); $fsFile_->BitsPerSample = bin_split($contents, 1); $contents = fread($fil, count($fsFile_->Subchunk2ID)); $fsFile_->Subchunk2ID = bin_split($contents, 1); $contents = fread($fil, count($fsFile_->Subchunk2Size)); $fsFile_->Subchunk2Size = bin_split($contents, 1); $lSize = CalcLittleEndianValue($fsFile_->Subchunk2Size); $contents = fread($fil, $lSize); $fsFile_->Data = bin_split($contents, 1); fclose($fil); } } function CalcLittleEndianValue(&$bValue) { $lSize_ = 0; for ($iByte = 0; $iByte < count($bValue); $iByte++) { $lSize_ += ($bValue[$iByte] * pow(16, ($iByte * 2))); } return $lSize_; } function GetLittleEndianByteArray($lValue) { $running = 0; $b = array(0, 0, 0, 0); $running = $lValue / pow(16,6); $b[3] = floor($running); $running -= $b[3]; $running *= 256; $b[2] = floor($running); $running -= $b[2]; $running *= 256; $b[1] = floor($running); $running -= $b[1]; $running *= 256; $b[0] = round($running); return $b; } function bin_split($text, $c) { $arr = array(); $len = strlen($text); $a = 0; while($a < $len) { if ($a + $c > $len) { $c = $len - $a; } $arr[$a] = ord(substr($text, $a, $c)); $a += $c; } return $arr; } 為了實現這個類的功能，你可以創建一個CStitcher實例並調用StitchFiles()方法，以傳遞合適的參數： $ChunkID_ = array(0x52, 0x49, 0x46, 0x46); //"RIFF" big endian $FileFormat_ = array(0x57, 0x41, 0x56, 0x45); //"WAVE" big endian $Subchunk1ID_ = array(0x66, 0x6D, 0x74, 0x20); //"fmt" big endian $AudioFormat_ = array(0x1, 0x0); //PCM = 1 little endian $Stereo_ = array(0x2, 0x0); //Stereo = 2 little endian $Mono_ = array(0x1, 0x0); //Mono = 1 little endian $SampleRate_ = array(0x44, 0xAC, 0x0, 0x0); //44100 little endian $BitsPerSample_ = array(0x10, 0x0); //16 little endian $Subchunk2ID_ = array(0x64, 0x61, 0x74, 0x61); //"data" big endian $files = array("C:\\Inetpub\\wwwroot\\Test\\PHP\\1.wav", "C:\\Inetpub\\wwwroot\\Test\\PHP\\2.wav"); $Stitcher = new CStitcher(); $file = new FILESTRUCT(); $Stitcher->StitchFiles($file, $files); 可用以下代碼將二進制數據寫到HTTP輸出中： header('Content-type: audio/x-wav', true); header('Content-Disposition: attachment;filename=stitch.wav'); foreach($file->ChunkID as $val) { print chr($val); } foreach($file->ChunkSize as $val) { print chr($val); } foreach($file->Format as $val) { print chr($val); } foreach($file->Subchunk1ID as $val) { print chr($val); } foreach($file->Subchunk1Size as $val) { print chr($val); } foreach($file->AudioFormat as $val) { print chr($val); } foreach($file->NumChannels as $val) { print chr($val); } foreach($file->SampleRate as $val) { print chr($val); } foreach($file->ByteRate as $val) { print chr($val); } foreach($file->BlockAlign as $val) { print chr($val); } foreach($file->BitsPerSample as $val) { print chr($val); } foreach($file->Subchunk2ID as $val) { print chr($val); } foreach($file->Subchunk2Size as $val) { print chr($val); } foreach($file->Data as $val) { print chr($val); } 以下是一段Html代碼，用於測試結果： <html> <head> <sc
