Beispiel #1
0
        private void ResetStream(bool hardReset)
        {
            if (position > byteMappings.Omega.To)
            {
                throw new Exception("position beyond length");
            }

            length = byteMappings.Omega.To;

            byteMappings.SetWarpedPosition(position);
            ByteTimeWarp mL = byteMappings.Lower;
            ByteTimeWarp mH = byteMappings.Upper;


            if (cropStream == null || cropStream.Begin != mL.From || cropStream.End != mH.From || resamplingStream.Length != byteMappings.Omega.To)
            {
                // mapping has changed, stream subsection must be renewed
                if (hardReset)
                {
                    // Each internal stream for each warped/resampled section works on the same underlying source stream, so
                    // we add the SourceClosePreventionStream to avoid the source being closed when an internally used stream
                    // of a section is disposed or closed (as in the call below). The source stream continues to get closed
                    // when this stream is closed.
                    cropStream = new CropStream(new SourceClosePreventionStream(sourceStream), mL.From, mH.From);

                    // Get rid of stream for previous section
                    if (resamplingStream != null)
                    {
                        resamplingStream.Close();
                    }

                    // Create stream for current section
                    resamplingStream          = new ResamplingStream(cropStream, ResamplingQuality.VariableRate, ByteTimeWarp.CalculateSampleRateRatio(mL, mH));
                    resamplingStream.Position = position - mL.To;
                }
                else
                {
                    // Reset the streams to the new conditions without creating new instances as the hard reset does
                    // NOTE always hard resetting works too, but this mode has been added to keep the sample resampler throughout playback

                    // Reset crop stream to source bounds, else the successive setting of begin and end can fail if
                    // the new begin position is after the old end position and the validation in the crop stream fails
                    cropStream.Begin = 0;
                    cropStream.End   = sourceStream.Length;

                    // Reset the crop stream to the new bounds
                    cropStream.Begin    = mL.From;
                    cropStream.End      = mH.From;
                    cropStream.Position = 0;

                    // Reset the resampling stream
                    resamplingStream.SampleRateRatio = ByteTimeWarp.CalculateSampleRateRatio(mL, mH);
                    resamplingStream.Position        = position - mL.To;
                }
            }
        }
Beispiel #2
0
        private void ResetStream(bool hardReset)
        {
            if (position > byteMappings.Omega.To)
            {
                throw new Exception("position beyond length");
            }

            length = byteMappings.Omega.To;

            byteMappings.SetWarpedPosition(position);
            ByteTimeWarp mL = byteMappings.Lower;
            ByteTimeWarp mH = byteMappings.Upper;


            if (cropStream == null || cropStream.Begin != mL.From || cropStream.End != mH.From || resamplingStream.Length != byteMappings.Omega.To)
            {
                // mapping has changed, stream subsection must be renewed
                if (hardReset)
                {
                    cropStream = new CropStream(sourceStream, mL.From, mH.From);
                    if (resamplingStream != null)
                    {
                        resamplingStream.Close();
                    }
                    resamplingStream          = new ResamplingStream(cropStream, ResamplingQuality.VariableRate, ByteTimeWarp.CalculateSampleRateRatio(mL, mH));
                    resamplingStream.Position = position - mL.To;
                }
                else
                {
                    // Reset the streams to the new conditions without creating new instances as the hard reset does
                    // NOTE always hard resetting works too, but this mode has been added to keep the sample resampler throughout playback

                    // Reset crop stream to source bounds, else the successive setting of begin and end can fail if
                    // the new begin position is after the old end position and the validation in the crop stream fails
                    cropStream.Begin = 0;
                    cropStream.End   = sourceStream.Length;

                    // Reset the crop stream to the new bounds
                    cropStream.Begin    = mL.From;
                    cropStream.End      = mH.From;
                    cropStream.Position = 0;

                    // Reset the resampling stream
                    resamplingStream.SampleRateRatio = ByteTimeWarp.CalculateSampleRateRatio(mL, mH);
                    resamplingStream.Position        = position - mL.To;
                }
            }
        }
 public void ValidateMappings()
 {
     // validate that no mapping is overlapping with another one
     for (int x = 0; x < Count - 1; x++)
     {
         for (int y = x + 1; y < Count; y++)
         {
             if (this[x].To > this[y].To)
             {
                 throw new Exception(this[x] + " is overlapping " + this[y]);
             }
             else if (!ResamplingStream.CheckSampleRateRatio(TimeWarp.CalculateSampleRateRatio(this[x], this[y])))
             {
                 throw new Exception("invalid sample ratio: " + TimeWarp.CalculateSampleRateRatio(this[x], this[y]));
             }
         }
     }
 }