/// <summary>
/// 获取音频文件信息
/// </summary>
/// <returns>音频文件信息</returns>
public BASS_CHANNELINFO_INTERNAL GetWavInfo()
{
if (this.HandleValid())
{
return(WavHelper.ChannelGetInfo(this._handle));
}
else
{
throw new WavException("未加载音频数据");
}
}
/// <summary>
/// 获取解码后的线性short数据
/// </summary>
/// <returns>解码后的线性short数据</returns>
public static PcmDataInfo GetPcmDataShort(string filePath)
{
if (string.IsNullOrWhiteSpace(filePath))
{
throw new ArgumentNullException(nameof(filePath));
}
if (!File.Exists(filePath))
{
throw new FileNotFoundException("源文件不存在", filePath);
}
int handle = WavHelper.StreamCreateFile(filePath, 0, 0, BASSFlag.BASS_UNICODE | BASSFlag.BASS_STREAM_DECODE);
try
{
long byteLength = WavHelper.ChannelGetLength(handle, BASSMode.BASS_POS_BYTE);
double durationSeconds = WavHelper.ChannelBytes2Seconds(handle, byteLength);
int shortCount = (int)(byteLength);
short[] pcmData = new short[shortCount];
int count = WavHelper.ChannelGetData(handle, pcmData, shortCount);
//注:结果数据长度之所以除以2,是因为short=2byte,bass获取数据时必须使用字节长度,否则数据会少一半;
//但是使用字节长度获取数据后,后一半数据又全是0,需要截取掉
count = count / 2;
short[] pcmDataSrc = pcmData;
pcmData = new short[count];
Array.Copy(pcmDataSrc, pcmData, count);
BASS_CHANNELINFO_INTERNAL wavInfo = WavHelper.ChannelGetInfo(handle);
return(new PcmDataInfo(wavInfo, durationSeconds, pcmData));
}
finally
{
WavHelper.StreamFree(handle);
}
}
/// <summary>
/// 获取解码后的线性byte数据
/// </summary>
/// <returns>解码后的线性byte数据</returns>
public static PcmDataInfo GetPcmDataByte(string filePath)
{
if (string.IsNullOrWhiteSpace(filePath))
{
throw new ArgumentNullException(nameof(filePath));
}
if (!File.Exists(filePath))
{
throw new FileNotFoundException("源文件不存在", filePath);
}
int handle = WavHelper.StreamCreateFile(filePath, 0, 0, BASSFlag.BASS_UNICODE | BASSFlag.BASS_STREAM_DECODE);
try
{
long byteLength = WavHelper.ChannelGetLength(handle, BASSMode.BASS_POS_BYTE);
double durationSeconds = WavHelper.ChannelBytes2Seconds(handle, byteLength);
byte[] pcmData = new byte[byteLength];
int count = WavHelper.ChannelGetData(handle, pcmData, (int)byteLength);
if (count != byteLength)
{
WavLoger.OnRaiseLog(filePath, $"获取到文件长度:{byteLength},读取到数据长度:{count},二者不一致,根据实际读取进行拷贝");
byte[] pcmDataSrc = pcmData;
pcmData = new byte[count];
Array.Copy(pcmDataSrc, pcmData, pcmData.Length);
}
BASS_CHANNELINFO_INTERNAL wavInfo = WavHelper.ChannelGetInfo(handle);
return(new PcmDataInfo(wavInfo, durationSeconds, pcmData));
}
finally
{
WavHelper.StreamFree(handle);
}
}