/// <summary>
/// Mix Sound sample of given <see cref="Chart"/>.
/// Resulting a single <see cref="MixedSample"/> of prerendered the <see cref="Chart"/>.
/// </summary>
/// <param name="chart">a <see cref="Chart"/> instance that contain samples to be mixed and prerendered.</param>
/// <param name="mode">Specifies sample mixing mode.</param>
/// <param name="channelCount">The number of channels that will be used for prerendering the <see cref="Chart"/>.</param>
/// <param name="sampleRate">The rate of sample that will be used for prerendering the <see cref="Chart"/>.</param>
/// <returns>a Single <see cref="MixedSample"/> of prerendered given <see cref="Chart"/></returns>
public static MixedSample Mix(Chart chart, MixMode mode = MixMode.Full, int channelCount = 2, int sampleRate = 44100)
{
int sampleCount = (sampleRate * channelCount);
var samples = new short[sampleCount * (int)chart.Duration.TotalSeconds];
var events = Array.ConvertAll(Array.FindAll(chart.Events, (ev) => ev is Event.Sound), ((ev) => ev as Event.Sound));
foreach (var ev in events)
{
if (ev.Payload == null || ev.Signature == Event.SignatureType.Release || (mode == MixMode.BGM && ev.Channel != Event.ChannelType.BGM) || (mode == MixMode.Keysound && ev.Channel == Event.ChannelType.BGM))
{
continue;
}
using (var stream = new MemoryStream(ev.Payload))
using (var decoder = SoundProcessorFactory.CreateDecoder(stream))
{
var info = decoder.SampleInfo;
var keysound = new short[info.SampleCount];
long offset = (long)(ev.Timestamp.TotalSeconds * sampleCount);
long read = 0;
while ((read = decoder.Read(keysound, info.SampleCount)) > 0)
{
if (offset + read >= samples.Length)
{
int newSize = samples.Length;
while (newSize < offset + read)
{
newSize += sampleRate * channelCount;
}
Array.Resize(ref samples, newSize);
}
for (int i = 0; i < read; i++)
{
int buffer = samples[offset + i] + keysound[i];
if (buffer > short.MaxValue)
{
buffer = short.MaxValue;
}
else if (buffer < short.MinValue)
{
buffer = short.MinValue;
}
samples[offset + i] = (short)buffer;
}
offset += read;
}
}
}
return(new MixedSample(samples, channelCount, sampleRate));
}
public MainForm()
{
try
{
// Costura load assembly on demand (lazy load)
// So we initialize this earlier to prevent heavy load when we initialize first chart
InitializeComponent();
SoundSystem.Instance.Initialize();
SoundProcessorFactory.InstallEncoder <MP3Encoder>((stream, sampleRate, channel, own) => new MP3Encoder(stream, sampleRate, channel, own));
}
catch (Exception ex)
{
MessageBox.Show("Failed to initialize sound system.\nPlease make sure OpenAL is placed / installed properly or rerun the application once more.\n\n" + ex.Message,
"Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
Application.Exit();
return;
}
}
private static SampleInfo EncodeTo <T>(byte[] payload)
where T : SoundEncoder
{
payload = payload == null ? new byte[0] : payload;
if (payload == null || payload.Length == 0)
{
return(default(SampleInfo));
}
using (var decoder = SoundProcessorFactory.CreateDecoder(new MemoryStream(payload)))
{
if (decoder == null)
{
return(default(SampleInfo));
}
else if (!(decoder is T))
{
short[] buffer = new short[44100 * 2];
using (var sampleStream = new MemoryStream())
using (var encoder = SoundProcessorFactory.CreateEncoder <T>(sampleStream, 44100, 2))
{
long read = 0;
do
{
read = decoder.Read(buffer, buffer.Length);
encoder.Write(buffer, read);
}while (read > 0);
encoder.Flush();
payload = sampleStream.ToArray();
return(encoder.SampleInfo);
}
}
return(decoder.SampleInfo);
}
}
