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Finally starting to understand sample decoding algorithm

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This commit is contained in:
Michael Becker 2014-04-16 19:37:23 -04:00
parent 03254d0009
commit 7387ab4a6a
1 changed files with 4 additions and 11 deletions
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15
CSharp/Plugins/UniversalEditor.Plugins.OSLib/DataFormats/Multimedia/Audio/BGM/BGMDataFormat.cs
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@ -37,14 +37,7 @@ namespace UniversalEditor.DataFormats.Multimedia.Audio.BGM
byte unknown2 = reader.ReadByte();
byte[] sampleData = reader.ReadToEnd();
short[] samples = new short[sampleData.Length / 2];
for (int i = 0; i < samples.Length; i++)
{
short sample = BitConverter.ToInt16(new byte[] { sampleData[(i * 2)], sampleData[(i * 2) + 1] }, 0);
samples[i] = sample;
}
short[] usamples = OSLDecode(samples);
short[] usamples = OSLDecode(sampleData.Length / 2, sampleData);
WaveformAudioObjectModel wave = (objectModel as WaveformAudioObjectModel);
wave.RawSamples = usamples;
@ -114,15 +107,15 @@ namespace UniversalEditor.DataFormats.Multimedia.Audio.BGM
}
else
{
by = (uint)(samples[si]);
by = (uint)(data[si]);
code = by & 0x0f;
}
diff = ima9_rescale(step, code);
index += ima9_step_indices[code & 0x07];
usamples[si] = (short)(samples[si] + diff);
if (samples[si] < -32768)
usamples[si] = (short)(data[si] + diff);
if (usamples[si] < -32768)
{
usamples[si] = -32768;
}