niko
Moderator |
Quote
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| 2010-02-19 10:50:11 |
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Take a look at the C++ example on how to write a wave file from the recorded audio. It calls:
// write the recorded audio as wave file
writeWaveFile("recorded.wav", recorder->getAudioFormat(), recorder->getRecordedAudioData());
with the following implementation
// writes the recorded audio data into a .WAV file
void writeWaveFile(const char* filename, SAudioStreamFormat format, void* data)
{
if (!data)
{
printf("Could not save recorded data to %s, nothing recorded\n", filename);
return;
}
FILE* file = fopen(filename, "wb");
if (file)
{
// write wave header
unsigned short formatType = 1;
unsigned short numChannels = format.ChannelCount;
unsigned long sampleRate = format.SampleRate;
unsigned short bitsPerChannel = format.getSampleSize() * 8;
unsigned short bytesPerSample = format.getFrameSize() ;
unsigned long bytesPerSecond = format.getBytesPerSecond();
unsigned long dataLen = format.getSampleDataSize();
const int fmtChunkLen = 16;
const int waveHeaderLen = 4 + 8 + fmtChunkLen + 8;
unsigned long totalLen = waveHeaderLen + dataLen;
fwrite("RIFF", 4, 1, file);
fwrite(&totalLen, 4, 1, file);
fwrite("WAVE", 4, 1, file);
fwrite("fmt ", 4, 1, file);
fwrite(&fmtChunkLen, 4, 1, file);
fwrite(&formatType, 2, 1, file);
fwrite(&numChannels, 2, 1, file);
fwrite(&sampleRate, 4, 1, file);
fwrite(&bytesPerSecond, 4, 1, file);
fwrite(&bytesPerSample, 2, 1, file);
fwrite(&bitsPerChannel, 2, 1, file);
// write data
fwrite("data", 4, 1, file);
fwrite(&dataLen, 4, 1, file);
fwrite(data, dataLen, 1, file);
// finish
printf("Saved audio as %s\n", filename);
fclose(file);
}
else
printf("Could not open %s to write audio data\n", filename);
}
I guess it should be easy to port this to CSharp (I think you are using this?), or at least read the code and find out if you forgot something.
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taurian
Registered User |
Quote
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| 2016-06-28 15:17:57 |
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Here is what I think the .net version is. However the saved .wav does not play:
private void SaveWave(string path, AudioFormat format, byte[] waveData)
{
//Play the audio for testing purposes
ss = engine0.AddSoundSourceFromPCMData(waveData, "sound", format);
engine0.Play2D(ss, true, false, false);
// write wave header
ushort formatType = 1;
ushort numChannels = (ushort)format.ChannelCount;
ulong sampleRate = (ulong)format.SampleRate;
ushort bitsPerChannel = (ushort)(format.SampleSize * 8);
ushort bytesPerSample = (ushort)format.FrameSize;
ulong bytesPerSecond = (ulong)format.BytesPerSecond;
ulong dataLen = (ulong)format.SampleDataSize;
const int fmtChunkLen = 16;
const int waveHeaderLen = 4 + 8 + fmtChunkLen + 8;
ulong totalLen = waveHeaderLen + dataLen;
FileStream fs = new FileStream(path, FileMode.Create, FileAccess.Write);
BinaryWriter bw = new BinaryWriter(fs);
byte[] riff = System.Text.Encoding.ASCII.GetBytes("RIFF");
bw.Write(riff);
bw.Write(totalLen);
byte[] fmt = System.Text.Encoding.ASCII.GetBytes("WAVEfmt ");
bw.Write(fmt);
bw.Write(fmtChunkLen);
bw.Write(formatType);
bw.Write(numChannels);
bw.Write(sampleRate);
bw.Write(bytesPerSecond);
bw.Write(bytesPerSample);
bw.Write(bitsPerChannel);
byte[] data = System.Text.Encoding.ASCII.GetBytes("data");
bw.Write(data);
bw.Write(waveData.Length);
bw.Write(waveData);
bw.Close();
fs.Close();
}
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