音频转码

转码格式

您可以通过相应的函数将音频从一种 RAW 或 Encoded 格式转码为另一种格式。

Blueprint

C++

// From encoded file to encoded file
URuntimeAudioTranscoder::TranscodeEncodedDataFromFile(TEXT("C:/Folder/AudioFrom.mp3"), ERuntimeAudioFormat::Auto,
   TEXT("C:/Folder/AudioTo.ogg"), ERuntimeAudioFormat::OggVorbis,
   100, FRuntimeAudioExportOverrideOptions(),
   FOnEncodedDataTranscodeFromFileResultNative::CreateWeakLambda(this, [](bool bSucceeded)
   {
   	// Handle the result	
   }));

// From encoded buffer to encoded buffer
TArray64<uint8> EncodedDataFrom;
URuntimeAudioTranscoder::TranscodeEncodedDataFromBuffer(EncodedDataFrom, ERuntimeAudioFormat::Auto,
   ERuntimeAudioFormat::Wav,
   100, FRuntimeAudioExportOverrideOptions(),
   FOnEncodedDataTranscodeFromBufferResultNative::CreateWeakLambda(this, [](bool bSucceeded, const TArray64<uint8>& EncodedData)
   {
   	// Handle the result
   }));

// From RAW file to RAW file
URuntimeAudioTranscoder::TranscodeRAWDataFromFile(TEXT("C:/Folder/AudioFrom.raw"), ERuntimeRAWAudioFormat::Int16,
   TEXT("C:/Folder/AudioTo.raw"), ERuntimeRAWAudioFormat::Float32,
   FOnRAWDataTranscodeFromFileResultNative::CreateWeakLambda(this, [](bool bSucceeded)
   {
   	// Handle the result
   }));

// From RAW buffer to RAW buffer
TArray64<uint8> RAWDataFrom;
URuntimeAudioTranscoder::TranscodeRAWDataFromBuffer(RAWDataFrom, ERuntimeRAWAudioFormat::Int8,
   ERuntimeRAWAudioFormat::Int32,
   FOnRAWDataTranscodeFromBufferResultNative::CreateWeakLambda(this, [](bool bSucceeded, const TArray64<uint8>& RAWData)
   {
   	// Handle the result
   }));

将浮点数组转换为字节

您可以将浮点数组（例如，32位浮点PCM数据）转换为字节数组。当音频数据需要以字节形式存在时（例如用于网络传输或某些处理系统），这会非常有用。在使用 OnGeneratePCMData 或 OnPopulateAudioData 等委托时，通常需要进行此转换，因为它们输出的是浮点PCM数据。

Blueprint

C++

// Assuming FloatArray is an array of floats (such as 32-bit float PCM data)
TArray<float> FloatArray;

// Synchronous
TArray<uint8> ByteArray = URuntimeAudioUtilities::ConvertFloatArrayToBytes(FloatArray);

// Asynchronous
URuntimeAudioUtilities::ConvertFloatArrayToBytesAsync(FloatArray,
   FOnConvertFloatArrayToBytesResultNative::CreateWeakLambda(this, [this](const TArray<uint8>& ByteArray)
   {
   	// Handle the result
   }));