/// <summary>
/// Gets the track tempo change as a ratio (i.e. 1.02, .97 etc)
/// </summary>
/// <param name="track1">The track being fading out</param>
/// <param name="track2">The track being faded into.</param>
/// <returns>The ratio the first track needs to be multiplied by to in order to match the second track</returns>
public static float GetTrackTempoChangeAsRatio(Track track1, Track track2)
{
if (track1 == null || track2 == null)
{
return(1f);
}
var percentChange = (float)(BpmHelper.GetAdjustedBpmPercentChange(track1.EndBpm, track2.StartBpm));
return(1 + percentChange / 100f);
}
/// <summary>
/// Sets the audio stream pitch to match another BPM
/// </summary>
/// <param name="audioStream">The audio stream to change the temp of.</param>
/// <param name="streamBpm">The stream BPM.</param>
/// <param name="matchBpm">The match BPM.</param>
public static void SetPitchToMatchBpm(AudioStream audioStream, decimal streamBpm, decimal matchBpm)
{
if (audioStream == null || audioStream.ChannelId == int.MinValue)
{
return;
}
var percentChange = (float)(BpmHelper.GetAdjustedBpmPercentChange(streamBpm, matchBpm));
//lock (Lock)
{
Bass.BASS_ChannelSetAttribute(audioStream.ChannelId, BASSAttribute.BASS_ATTRIB_TEMPO_PITCH, percentChange);
Thread.Sleep(1);
}
}
internal static void SetTempoToMatchBpm(int channel, decimal streamBpm, decimal matchBpm)
{
if (channel == int.MinValue)
{
return;
}
var percentChange = (float)(BpmHelper.GetAdjustedBpmPercentChange(streamBpm, matchBpm));
//lock (Lock)
{
Bass.BASS_ChannelSetAttribute(channel, BASSAttribute.BASS_ATTRIB_TEMPO, percentChange);
Thread.Sleep(1);
Bass.BASS_ChannelSetAttribute(channel, BASSAttribute.BASS_ATTRIB_TEMPO_OPTION_SEQUENCE_MS,
matchBpm > streamBpm ? 20 : 82);
Thread.Sleep(1);
}
}
/// <summary>
/// Sets the audio stream tempo to match another audio stream's tempo
/// </summary>
/// <param name="changeTrack">The audio stream to change the temp of.</param>
/// <param name="matchTrack">The audio stream to match the BPM of</param>
public static void SetTrackTempoToMatchAnotherTrack(Track changeTrack, Track matchTrack)
{
if (changeTrack == null || matchTrack == null)
{
return;
}
if (!changeTrack.IsAudioLoaded())
{
return;
}
if (!matchTrack.IsAudioLoaded())
{
return;
}
var percentChange = (float)(BpmHelper.GetAdjustedBpmPercentChange(changeTrack.EndBpm, matchTrack.StartBpm));
//lock (Lock)
{
Bass.BASS_ChannelSetAttribute(changeTrack.ChannelId, BASSAttribute.BASS_ATTRIB_TEMPO, percentChange);
Thread.Sleep(1);
}
}
/// <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);
}
