/// <summary>
/// Saves the partial as wave.
/// </summary>
/// <param name="inFilename">The in filename.</param>
/// <param name="outFilename">The out filename.</param>
/// <param name="start">The start position in seconds.</param>
/// <param name="length">The length in seconds.</param>
/// <param name="offset">The offset position in seconds.</param>
/// <param name="gain">The gain.</param>
/// <param name="bpm">The BPM.</param>
/// <param name="targetBpm">The target BPM.</param>
public static void SavePartialAsWave(string inFilename,
string outFilename,
double start,
double length,
double offset = 0,
float gain = 0,
decimal bpm = 0,
decimal targetBpm = 0)
{
// DebugHelper.WriteLine("Saving portion of track as wave with offset - " + inFilename);
var audioStream = new Sample
{
Filename = inFilename,
Description = inFilename,
Gain = gain,
Bpm = bpm
};
AudioStreamHelper.LoadAudio(audioStream);
if (targetBpm != 0)
{
if (bpm == 0)
{
bpm = BpmHelper.GetBpmFromLoopLength(length);
}
var percentChange = BpmHelper.GetAdjustedBpmPercentChange(bpm, targetBpm) / 100;
AudioStreamHelper.SetTempoToMatchBpm(audioStream.ChannelId, bpm, targetBpm);
length = length * (double)(1 + percentChange);
}
const BASSEncode flags = BASSEncode.BASS_ENCODE_PCM;
BassEnc.BASS_Encode_Start(audioStream.ChannelId, outFilename, flags, null, IntPtr.Zero);
var startByte = Bass.BASS_ChannelSeconds2Bytes(audioStream.ChannelId, start);
var endByte = Bass.BASS_ChannelSeconds2Bytes(audioStream.ChannelId, start + length);
if (offset == 0 || offset == start)
{
TransferBytes(audioStream.ChannelId, startByte, endByte);
}
else
{
startByte = Bass.BASS_ChannelSeconds2Bytes(audioStream.ChannelId, offset);
TransferBytes(audioStream.ChannelId, startByte, endByte);
startByte = Bass.BASS_ChannelSeconds2Bytes(audioStream.ChannelId, start);
endByte = Bass.BASS_ChannelSeconds2Bytes(audioStream.ChannelId, offset);
TransferBytes(audioStream.ChannelId, startByte, endByte);
}
BassEnc.BASS_Encode_Stop(audioStream.ChannelId);
Bass.BASS_StreamFree(audioStream.ChannelId);
AudioStreamHelper.UnloadAudio(audioStream);
}
/// <summary>
/// Saves audio data as a mono wave.
/// </summary>
/// <param name="audioData">The audio data.</param>
/// <param name="outFilename">The output filename.</param>
/// <param name="length">The maximum length in seconds, or 0 for no limit.</param>
/// <param name="gain">The gain.</param>
/// <exception cref="System.Exception">Cannot load audio data</exception>
public static void SaveAsMonoWave(byte[] audioData, string outFilename, double length, float gain)
{
// DebugHelper.WriteLine("SaveAsMonoWave");
var audioDataHandle = GCHandle.Alloc(audioData, GCHandleType.Pinned);
var audioDataPointer = audioDataHandle.AddrOfPinnedObject();
var channel = Bass.BASS_StreamCreateFile(audioDataPointer, 0, audioData.Length,
BASSFlag.BASS_SAMPLE_FLOAT | BASSFlag.BASS_STREAM_DECODE | BASSFlag.BASS_STREAM_PRESCAN);
if (channel == 0)
{
throw new Exception("Cannot load audio data");
}
// create a mono 44100Hz mixer
var mixer = BassMix.BASS_Mixer_StreamCreate(44100, 1, BASSFlag.BASS_MIXER_END | BASSFlag.BASS_STREAM_DECODE);
// plug in the source
BassMix.BASS_Mixer_StreamAddChannel(mixer, channel,
BASSFlag.BASS_MIXER_DOWNMIX | BASSFlag.BASS_MIXER_NORAMPIN);
AudioStreamHelper.SetReplayGain(mixer, gain);
const BASSEncode flags = BASSEncode.BASS_ENCODE_PCM;
BassEnc.BASS_Encode_Start(mixer, outFilename, flags, null, IntPtr.Zero);
const int startByte = 0;
if (length == 0)
{
length = Bass.BASS_ChannelBytes2Seconds(channel, Bass.BASS_ChannelGetLength(channel));
}
var totalTransferLength = Bass.BASS_ChannelSeconds2Bytes(mixer, length);
Bass.BASS_ChannelSetPosition(channel, startByte, BASSMode.BASS_POS_BYTES);
while (totalTransferLength > 0)
{
var buffer = new byte[65536];
var transferLength = totalTransferLength;
if (transferLength > buffer.Length)
{
transferLength = buffer.Length;
}
// get the decoded sample data
var transferred = Bass.BASS_ChannelGetData(mixer, buffer, (int)transferLength);
if (transferred <= 1)
{
break; // error or the end
}
totalTransferLength -= transferred;
}
BassEnc.BASS_Encode_Stop(mixer);
BassMix.BASS_Mixer_ChannelRemove(channel);
Bass.BASS_StreamFree(channel);
Bass.BASS_StreamFree(mixer);
audioDataHandle.Free();
// DebugHelper.WriteLine("END SaveAsMonoWave");
}
