protected override void PrepareInternal()
{
base.PrepareInternal();
begin = true;
if (byteBuffer != null)
{
return;
}
compressedSoundStream.Position = 0;
currentPacketIndex = 0;
startPktSampleIndex = 0;
endPktSampleIndex = 0;
endPacketIndex = numberOfPackets;
PlayRange range;
lock (rangeLock)
{
range = playRange;
}
// Reset decoder state
decoder.ResetDecoder();
// Ignore invalid data at beginning (due to encoder delay) & end of stream (due to packet size)
var samplesToSkip = decoder.GetDecoderSampleDelay();
var frameSize = SamplesPerFrame * channels;
//ok we need to handle this case properly, this means that the user wants to use a different then full audio stream range...
var sampleStart = (channels * samplesToSkip) + (int)Math.Floor(sampleRate * (double)channels * range.Start.TotalSeconds);
startPktSampleIndex = sampleStart % (frameSize);
var sampleStop = (channels * samplesToSkip)
+ (range.Length != TimeSpan.Zero
? (int)Math.Floor(sampleRate * (double)channels * range.End.TotalSeconds)
: (channels * samples));
endPktSampleIndex = frameSize - sampleStop % frameSize;
var skipCounter = startingPacketIndex = sampleStart / frameSize;
endPacketIndex = sampleStop / frameSize;
// skip to the starting packet
if (startingPacketIndex < numberOfPackets && endPacketIndex < numberOfPackets && startingPacketIndex < endPacketIndex)
{
//valid offsets.. process it
while (skipCounter-- > 0)
{
//skip data to reach starting packet
var len = reader.ReadInt16();
compressedSoundStream.Position = compressedSoundStream.Position + len;
currentPacketIndex++;
}
}
}
protected override void PrepareInternal()
{
base.PrepareInternal();
begin = true;
if (byteBuffer != null)
{
return;
}
compressedSoundStream.Position = 0;
currentPacketIndex = 0;
startPktSampleIndex = 0;
endPktSampleIndex = 0;
endPacketIndex = numberOfPackets;
PlayRange range;
lock (rangeLock)
{
range = playRange;
}
// Reset decoder state
decoder.ResetDecoder();
// Ignore invalid data at beginning (due to encoder delay) & end of stream (due to packet size)
var samplesToSkip = decoder.GetDecoderSampleDelay();
// Compute boundaries
var sampleBegin = (channels * samplesToSkip);
var sampleEnd = sampleBegin + (channels * samples);
var frameSize = SamplesPerFrame * channels;
//ok we need to handle this case properly, this means that the user wants to use a different then full audio stream range...
var sampleStart = sampleBegin + (int)Math.Floor(sampleRate * (double)channels * range.Start.TotalSeconds);
// Make sure start is at least one sample before the end to avoid edge cases where startingPacketIndex == numberOfPackets
sampleStart = Math.Min(Math.Max(sampleStart, sampleBegin), sampleEnd - 1 * channels);
var sampleStop = sampleBegin
+ (range.Length != TimeSpan.Zero
? (int)Math.Floor(sampleRate * (double)channels * range.End.TotalSeconds)
: (channels * samples));
// Make sure stop is at least one sample after start
sampleStop = Math.Min(Math.Max(sampleStop, sampleStart + 1 * channels), sampleEnd);
// Compute start/end packet
startingPacketIndex = sampleStart / frameSize;
endPacketIndex = (sampleStop - 1) / frameSize; // -1 to make sure we stay in last packet if using all of it
// How much data to use in start/end packet
startPktSampleIndex = sampleStart % (frameSize);
endPktSampleIndex = frameSize - sampleStop % frameSize;
// skip to the starting packet
if (startingPacketIndex < numberOfPackets && endPacketIndex < numberOfPackets && startingPacketIndex <= endPacketIndex) // this shouldn't happen anymore with the min/max clamps
{
//valid offsets.. process it
var skipCounter = startingPacketIndex;
while (skipCounter-- > 0)
{
//skip data to reach starting packet
var len = reader.ReadInt16();
compressedSoundStream.Position = compressedSoundStream.Position + len;
currentPacketIndex++;
}
}
}
