package com.example.mp4composer.composer;

import android.util.Log;

/**
 * *********************************************************
 *    Sonic library
 *    Copyright 2010, 2011
 *    Bill Cox
 *    This file is part of the Sonic Library.
 *
 *    This file is licensed under the Apache 2.0 license.
 * *********************************************************
 *
 * Sonic audio stream processor for time/pitch stretching
 *
 * ref on https://github.com/waywardgeek/sonic.
 *
 *
 */

class SonicAudioProcessor {

    private static final int SONIC_MIN_PITCH = 65;
    private static final int SONIC_MAX_PITCH = 400;
    // This is used to down-sample some inputs to improve speed
    private static final int SONIC_AMDF_FREQ = 4000;

    private short inputBuffer[];
    private short outputBuffer[];
    private short pitchBuffer[];
    private short downSampleBuffer[];
    private float speed;
    private float volume;
    private float pitch;
    private float rate;
    private int oldRatePosition;
    private int newRatePosition;
    private boolean useChordPitch;
    private int quality;
    private int numChannels;
    private int inputBufferSize;
    private int pitchBufferSize;
    private int outputBufferSize;
    private int numInputSamples;
    private int numOutputSamples;
    private int numPitchSamples;
    private int minPeriod;
    private int maxPeriod;
    private int maxRequired;
    private int remainingInputToCopy;
    private int sampleRate;
    private int prevPeriod;
    private int prevMinDiff;
    private int minDiff;
    private int maxDiff;

    // Create a sonic stream.
    SonicAudioProcessor(
            int sampleRate,
            int numChannels)
    {
        allocateStreamBuffers(sampleRate, numChannels);
        speed = 1.0f;
        pitch = 1.0f;
        volume = 1.0f;
        rate = 1.0f;
        oldRatePosition = 0;
        newRatePosition = 0;
        useChordPitch = false;
        quality = 0;
    }

    // Resize the array.
    private short[] resize(
            short[] oldArray,
            int newLength)
    {
        newLength *= numChannels;
        short[]  newArray = new short[newLength];
        int length = oldArray.length <= newLength? oldArray.length : newLength;

        System.arraycopy(oldArray, 0, newArray, 0, length);
        return newArray;
    }

    // Move samples from one array to another.  May move samples down within an array, but not up.
    private void move(
            short dest[],
            int destPos,
            short source[],
            int sourcePos,
            int numSamples)
    {
        System.arraycopy(source, sourcePos*numChannels, dest, destPos*numChannels, numSamples*numChannels);
    }

    // Scale the samples by the factor.
    private void scaleSamples(
            short samples[],
            int position,
            int numSamples,
            float volume)
    {
        int fixedPointVolume = (int)(volume*4096.0f);
        int start = position*numChannels;
        int stop = start + numSamples*numChannels;

        for(int xSample = start; xSample < stop; xSample++) {
            int value = (samples[xSample]*fixedPointVolume) >> 12;
            if(value > 32767) {
                value = 32767;
            } else if(value < -32767) {
                value = -32767;
            }
            samples[xSample] = (short)value;
        }
    }

    // Get the speed of the stream.
    public float getSpeed()
    {
        return speed;
    }

    // Set the speed of the stream.
    public void setSpeed(
            float speed)
    {
        this.speed = speed;
    }

    // Get the pitch of the stream.
    public float getPitch()
    {
        return pitch;
    }

    // Set the pitch of the stream.
    public void setPitch(
            float pitch)
    {
        this.pitch = pitch;
    }

    // Get the rate of the stream.
    public float getRate()
    {
        return rate;
    }

    // Set the playback rate of the stream. This scales pitch and speed at the same time.
    public void setRate(
            float rate)
    {
        this.rate = rate;
        this.oldRatePosition = 0;
        this.newRatePosition = 0;
    }

    // Get the vocal chord pitch setting.
    public boolean getChordPitch()
    {
        return useChordPitch;
    }

    // Set the vocal chord mode for pitch computation.  Default is off.
    public void setChordPitch(
            boolean useChordPitch)
    {
        this.useChordPitch = useChordPitch;
    }

    // Get the quality setting.
    public int getQuality()
    {
        return quality;
    }

    // Set the "quality".  Default 0 is virtually as good as 1, but very much faster.
    public void setQuality(
            int quality)
    {
        this.quality = quality;
    }

    // Get the scaling factor of the stream.
    public float getVolume()
    {
        return volume;
    }

    // Set the scaling factor of the stream.
    public void setVolume(
            float volume)
    {
        this.volume = volume;
    }

    // Allocate stream buffers.
    private void allocateStreamBuffers(
            int sampleRate,
            int numChannels)
    {
        this.sampleRate = sampleRate;
        this.numChannels = numChannels;
        minPeriod = sampleRate/SONIC_MAX_PITCH;
        maxPeriod = sampleRate/SONIC_MIN_PITCH;
        maxRequired = 2*maxPeriod;
        inputBufferSize = maxRequired;
        inputBuffer = new short[maxRequired*numChannels];
        outputBufferSize = maxRequired;
        outputBuffer = new short[maxRequired*numChannels];
        pitchBufferSize = maxRequired;
        pitchBuffer = new short[maxRequired*numChannels];
        downSampleBuffer = new short[maxRequired];
        oldRatePosition = 0;
        newRatePosition = 0;
        prevPeriod = 0;
    }

    // Get the sample rate of the stream.
    public int getSampleRate()
    {
        return sampleRate;
    }

    // Get the number of channels.
    public int getNumChannels()
    {
        return numChannels;
    }

    // Enlarge the output buffer if needed.
    private void enlargeOutputBufferIfNeeded(
            int numSamples)
    {
        if(numOutputSamples + numSamples > outputBufferSize) {
            outputBufferSize += (outputBufferSize >> 1) + numSamples;
            outputBuffer = resize(outputBuffer, outputBufferSize);
        }
    }

    // Enlarge the input buffer if needed.
    private void enlargeInputBufferIfNeeded(
            int numSamples)
    {
        if(numInputSamples + numSamples > inputBufferSize) {
            inputBufferSize += (inputBufferSize >> 1) + numSamples;
            inputBuffer = resize(inputBuffer, inputBufferSize);
        }
    }

    // Add the input samples to the input buffer.
    private void addFloatSamplesToInputBuffer(
            float samples[],
            int numSamples)
    {
        if(numSamples == 0) {
            return;
        }
        enlargeInputBufferIfNeeded(numSamples);
        int xBuffer = numInputSamples*numChannels;
        for(int xSample = 0; xSample < numSamples*numChannels; xSample++) {
            inputBuffer[xBuffer++] = (short)(samples[xSample]*32767.0f);
        }
        numInputSamples += numSamples;
    }

    // Add the input samples to the input buffer.
    private void addShortSamplesToInputBuffer(
            short samples[],
            int numSamples)
    {
        if(numSamples == 0) {
            return;
        }
        enlargeInputBufferIfNeeded(numSamples);
        move(inputBuffer, numInputSamples, samples, 0, numSamples);
        numInputSamples += numSamples;
    }

    // Add the input samples to the input buffer.
    private void addUnsignedByteSamplesToInputBuffer(
            byte samples[],
            int numSamples)
    {
        short sample;

        enlargeInputBufferIfNeeded(numSamples);
        int xBuffer = numInputSamples*numChannels;
        for(int xSample = 0; xSample < numSamples*numChannels; xSample++) {
            sample = (short)((samples[xSample] & 0xff) - 128); // Convert from unsigned to signed
            inputBuffer[xBuffer++] = (short) (sample << 8);
        }
        numInputSamples += numSamples;
    }

    // Add the input samples to the input buffer.  They must be 16-bit little-endian encoded in a byte array.
    private void addBytesToInputBuffer(
            byte inBuffer[],
            int numBytes)
    {
        int numSamples = numBytes/(2*numChannels);
        short sample;

        enlargeInputBufferIfNeeded(numSamples);
        int xBuffer = numInputSamples*numChannels;
        for(int xByte = 0; xByte + 1 < numBytes; xByte += 2) {
            sample = (short)((inBuffer[xByte] & 0xff) | (inBuffer[xByte + 1] << 8));
            inputBuffer[xBuffer++] = sample;
        }
        numInputSamples += numSamples;
    }

    // Remove input samples that we have already processed.
    private void removeInputSamples(
            int position)
    {
        int remainingSamples = numInputSamples - position;

        move(inputBuffer, 0, inputBuffer, position, remainingSamples);
        numInputSamples = remainingSamples;
    }

    // Just copy from the array to the output buffer
    private void copyToOutput(
            short samples[],
            int position,
            int numSamples)
    {
        enlargeOutputBufferIfNeeded(numSamples);
        move(outputBuffer, numOutputSamples, samples, position, numSamples);
        numOutputSamples += numSamples;
    }

    // Just copy from the input buffer to the output buffer.  Return num samples copied.
    private int copyInputToOutput(
            int position)
    {
        int numSamples = Math.min(maxRequired,remainingInputToCopy);

        copyToOutput(inputBuffer, position, numSamples);
        remainingInputToCopy -= numSamples;
        return numSamples;
    }

    // Read data out of the stream.  Sometimes no data will be available, and zero
    // is returned, which is not an error condition.
    private int readFloatFromStream(
            float samples[],
            int maxSamples)
    {
        int numSamples = numOutputSamples;
        int remainingSamples = 0;

        if(numSamples == 0) {
            return 0;
        }
        if(numSamples > maxSamples) {
            remainingSamples = numSamples - maxSamples;
            numSamples = maxSamples;
        }
        for(int xSample = 0; xSample < numSamples*numChannels; xSample++) {
            samples[xSample] = (outputBuffer[xSample])/32767.0f;
        }
        move(outputBuffer, 0, outputBuffer, numSamples, remainingSamples);
        numOutputSamples = remainingSamples;
        return numSamples;
    }

    // Read short data out of the stream.  Sometimes no data will be available, and zero
    // is returned, which is not an error condition.
    public int readShortFromStream(
            short samples[],
            int maxSamples)
    {
        int numSamples = numOutputSamples;
        int remainingSamples = 0;

        if(numSamples == 0) {
            return 0;
        }
        if(numSamples > maxSamples) {
            remainingSamples = numSamples - maxSamples;
            numSamples = maxSamples;
        }
        move(samples, 0, outputBuffer, 0, numSamples);
        move(outputBuffer, 0, outputBuffer, numSamples, remainingSamples);
        numOutputSamples = remainingSamples;
        return numSamples;
    }

    // Read unsigned byte data out of the stream.  Sometimes no data will be available, and zero
    // is returned, which is not an error condition.
    private int readUnsignedByteFromStream(
            byte samples[],
            int maxSamples)
    {
        int numSamples = numOutputSamples;
        int remainingSamples = 0;

        if(numSamples == 0) {
            return 0;
        }
        if(numSamples > maxSamples) {
            remainingSamples = numSamples - maxSamples;
            numSamples = maxSamples;
        }
        for(int xSample = 0; xSample < numSamples*numChannels; xSample++) {
            samples[xSample] = (byte)((outputBuffer[xSample] >> 8) + 128);
        }
        move(outputBuffer, 0, outputBuffer, numSamples, remainingSamples);
        numOutputSamples = remainingSamples;
        return numSamples;
    }

    // Read unsigned byte data out of the stream.  Sometimes no data will be available, and zero
    // is returned, which is not an error condition.
    private int readBytesFromStream(
            byte outBuffer[],
            int maxBytes)
    {
        int maxSamples = maxBytes/(2*numChannels);
        int numSamples = numOutputSamples;
        int remainingSamples = 0;

        if(numSamples == 0 || maxSamples == 0) {
            return 0;
        }
        if(numSamples > maxSamples) {
            remainingSamples = numSamples - maxSamples;
            numSamples = maxSamples;
        }
        for(int xSample = 0; xSample < numSamples*numChannels; xSample++) {
            short sample = outputBuffer[xSample];
            outBuffer[xSample << 1] = (byte)(sample & 0xff);
            outBuffer[(xSample << 1) + 1] = (byte)(sample >> 8);
        }
        move(outputBuffer, 0, outputBuffer, numSamples, remainingSamples);
        numOutputSamples = remainingSamples;
        return 2*numSamples*numChannels;
    }

    // Force the sonic stream to generate output using whatever data it currently
    // has.  No extra delay will be added to the output, but flushing in the middle of
    // words could introduce distortion.
    public void flushStream()
    {
        int remainingSamples = numInputSamples;
        float s = speed/pitch;
        float r = rate * pitch;
        int expectedOutputSamples = numOutputSamples + (int)((remainingSamples / s + numPitchSamples) / r + 0.5f);

//        // Add enough silence to flush both input and pitch buffers.
        enlargeInputBufferIfNeeded(remainingSamples + 2 * maxRequired);
        for(int xSample = 0; xSample < 2 * maxRequired * numChannels; xSample++) {
            inputBuffer[remainingSamples * numChannels + xSample] = 0;
        }
        numInputSamples += 2 * maxRequired;
        writeShortToStream(null, 0);
        // Throw away any extra samples we generated due to the silence we added.
        if(numOutputSamples > expectedOutputSamples) {
            numOutputSamples = expectedOutputSamples;
        }
        // Empty input and pitch buffers.
        numInputSamples = 0;
        remainingInputToCopy = 0;
        numPitchSamples = 0;
    }

    // Return the number of samples in the output buffer
    public int samplesAvailable()
    {
        return numOutputSamples;
    }

    // If skip is greater than one, average skip samples together and write them to
    // the down-sample buffer.  If numChannels is greater than one, mix the channels
    // together as we down sample.
    private void downSampleInput(
            short samples[],
            int position,
            int skip)
    {
        int numSamples = maxRequired/skip;
        int samplesPerValue = numChannels*skip;
        int value;

        position *= numChannels;
        for(int i = 0; i < numSamples; i++) {
            value = 0;
            for(int j = 0; j < samplesPerValue; j++) {
                value += samples[position + i * samplesPerValue + j];
            }
            value /= samplesPerValue;
            downSampleBuffer[i] = (short) value;
        }
    }

    // Find the best frequency match in the range, and given a sample skip multiple.
    // For now, just find the pitch of the first channel.
    private int findPitchPeriodInRange(
            short samples[],
            int position,
            int minPeriod,
            int maxPeriod)
    {
        int bestPeriod = 0;
        int worstPeriod = 255;
        int minDiff = 1;
        int maxDiff = 0;

        position *= numChannels;
        for(int period = minPeriod; period <= maxPeriod; period++) {
            int diff = 0;
            for(int i = 0; i < period; i++) {
                short sVal = samples[position + i];
                short pVal = samples[position + period + i];
                diff += (sVal >= pVal) ? sVal - pVal : pVal - sVal;
            }
            /* Note that the highest number of samples we add into diff will be less
               than 256, since we skip samples.  Thus, diff is a 24 bit number, and
               we can safely multiply by numSamples without overflow */
            if(diff * bestPeriod < minDiff * period) {
                minDiff = diff;
                bestPeriod = period;
            }
            if(diff * worstPeriod > maxDiff * period) {
                maxDiff = diff;
                worstPeriod = period;
            }
        }
        this.minDiff = minDiff/bestPeriod;
        this.maxDiff = maxDiff/worstPeriod;

        return bestPeriod;
    }

    // At abrupt ends of voiced words, we can have pitch periods that are better
    // approximated by the previous pitch period estimate.  Try to detect this case.
    private boolean prevPeriodBetter(
            int minDiff,
            int maxDiff,
            boolean preferNewPeriod)
    {
        if(minDiff == 0 || prevPeriod == 0) {
            return false;
        }
        if(preferNewPeriod) {
            if(maxDiff > minDiff * 3) {
                // Got a reasonable match this period
                return false;
            }
            if(minDiff * 2 <= prevMinDiff * 3) {
                // Mismatch is not that much greater this period
                return false;
            }
        } else {
            if(minDiff <= prevMinDiff) {
                return false;
            }
        }
        return true;
    }

    // Find the pitch period.  This is a critical step, and we may have to try
    // multiple ways to get a good answer.  This version uses AMDF.  To improve
    // speed, we down sample by an integer factor get in the 11KHz range, and then
    // do it again with a narrower frequency range without down sampling
    private int findPitchPeriod(
            short samples[],
            int position,
            boolean preferNewPeriod)
    {
        int period, retPeriod;
        int skip = 1;

        if(sampleRate > SONIC_AMDF_FREQ && quality == 0) {
            skip = sampleRate/SONIC_AMDF_FREQ;
        }
        if(numChannels == 1 && skip == 1) {
            period = findPitchPeriodInRange(samples, position, minPeriod, maxPeriod);
        } else {
            downSampleInput(samples, position, skip);
            period = findPitchPeriodInRange(downSampleBuffer, 0, minPeriod/skip,
                    maxPeriod/skip);
            if(skip != 1) {
                period *= skip;
                int minP = period - (skip << 2);
                int maxP = period + (skip << 2);
                if(minP < minPeriod) {
                    minP = minPeriod;
                }
                if(maxP > maxPeriod) {
                    maxP = maxPeriod;
                }
                if(numChannels == 1) {
                    period = findPitchPeriodInRange(samples, position, minP, maxP);
                } else {
                    downSampleInput(samples, position, 1);
                    period = findPitchPeriodInRange(downSampleBuffer, 0, minP, maxP);
                }
            }
        }
        if(prevPeriodBetter(minDiff, maxDiff, preferNewPeriod)) {
            retPeriod = prevPeriod;
        } else {
            retPeriod = period;
        }
        prevMinDiff = minDiff;
        prevPeriod = period;
        return retPeriod;
    }

    // Overlap two sound segments, ramp the volume of one down, while ramping the
    // other one from zero up, and add them, storing the result at the output.
    private static void overlapAdd(
            int frameCount,
            int channelCount,
            short[] out,
            int outPosition,
            short[] rampDown,
            int rampDownPosition,
            short[] rampUp,
            int rampUpPosition) {

        for (int i = 0; i < channelCount; i++) {
            int o = outPosition * channelCount + i;
            int u = rampUpPosition * channelCount + i;
            int d = rampDownPosition * channelCount + i;
            for (int t = 0; t < frameCount; t++) {
                out[o] = (short) ((rampDown[d] * (frameCount - t) + rampUp[u] * t) / frameCount);
                o += channelCount;
                d += channelCount;
                u += channelCount;
            }
        }
    }

    // Overlap two sound segments, ramp the volume of one down, while ramping the
    // other one from zero up, and add them, storing the result at the output.
    private void overlapAddWithSeparation(
            int numSamples,
            int numChannels,
            int separation,
            short out[],
            int outPos,
            short rampDown[],
            int rampDownPos,
            short rampUp[],
            int rampUpPos)
    {
        for(int i = 0; i < numChannels; i++) {

            int o = outPos * numChannels + i;
            int u = rampUpPos * numChannels + i;
            int d = rampDownPos * numChannels + i;

            for(int t = 0; t < numSamples + separation; t++) {

                if(t < separation) {
                    out[o] = (short)(rampDown[d] * (numSamples - t) / numSamples);
                    d += numChannels;
                } else if(t < numSamples) {
                    out[o] = (short)((rampDown[d] * (numSamples - t) + rampUp[u] * (t - separation)) / numSamples);
                    d += numChannels;
                    u += numChannels;
                } else {
                    out[o] = (short)(rampUp[u] * (t - separation) / numSamples);
                    u += numChannels;
                }
                o += numChannels;
            }
        }
    }

    // Just move the new samples in the output buffer to the pitch buffer
    private void moveNewSamplesToPitchBuffer(
            int originalNumOutputSamples)
    {
        int numSamples = numOutputSamples - originalNumOutputSamples;

        if(numPitchSamples + numSamples > pitchBufferSize) {
            pitchBufferSize += (pitchBufferSize >> 1) + numSamples;
            pitchBuffer = resize(pitchBuffer, pitchBufferSize);
        }
        move(pitchBuffer, numPitchSamples, outputBuffer, originalNumOutputSamples, numSamples);
        numOutputSamples = originalNumOutputSamples;
        numPitchSamples += numSamples;
    }

    // Remove processed samples from the pitch buffer.
    private void removePitchSamples(
            int numSamples)
    {
        if(numSamples == 0) {
            return;
        }
        move(pitchBuffer, 0, pitchBuffer, numSamples, numPitchSamples - numSamples);
        numPitchSamples -= numSamples;
    }

    // Change the pitch.  The latency this introduces could be reduced by looking at
    // past samples to determine pitch, rather than future.
    private void adjustPitch(
            int originalNumOutputSamples)
    {
        int period, newPeriod, separation;
        int position = 0;

        if(numOutputSamples == originalNumOutputSamples) {
            return;
        }
        moveNewSamplesToPitchBuffer(originalNumOutputSamples);
        while(numPitchSamples - position >= maxRequired) {
            period = findPitchPeriod(pitchBuffer, position, false);
            newPeriod = (int)(period/pitch);
            enlargeOutputBufferIfNeeded(newPeriod);
            if(pitch >= 1.0f) {
                overlapAdd(newPeriod, numChannels, outputBuffer, numOutputSamples, pitchBuffer,
                        position, pitchBuffer, position + period - newPeriod);
            } else {
                separation = newPeriod - period;
                Log.d("audio r", "adjustPitch: ");
                overlapAddWithSeparation(period, numChannels, separation, outputBuffer, numOutputSamples,
                        pitchBuffer, position, pitchBuffer, position);
            }
            numOutputSamples += newPeriod;
            position += period;
        }
        removePitchSamples(position);
    }


    // Return 1 if value >= 0, else -1.  This represents the sign of value.
    private int getSign(int value) {
        return value >= 0? 1 : -1;
    }

    // Interpolate the new output sample.
    private short interpolate(
            short in[],
            int inPos,  // Index to first sample which already includes channel offset.
            int oldSampleRate,
            int newSampleRate)
    {
        short left = in[inPos];
        short right = in[inPos + numChannels];
        int position = newRatePosition * oldSampleRate;
        int leftPosition = oldRatePosition * newSampleRate;
        int rightPosition = (oldRatePosition + 1) * newSampleRate;
        int ratio = rightPosition - position;
        int width = rightPosition - leftPosition;
        return (short) ((ratio * left + (width - ratio) * right) / width);
    }

    // Change the rate.
    private void adjustRate(
            float rate,
            int originalNumOutputSamples)
    {
        if(numOutputSamples == originalNumOutputSamples) {
            return;
        }

        int newSampleRate = (int)(sampleRate/rate);
        int oldSampleRate = sampleRate;
        int position;

        // Set these values to help with the integer math
        while(newSampleRate > (1 << 14) || oldSampleRate > (1 << 14)) {
            newSampleRate >>= 1;
            oldSampleRate >>= 1;
        }

        moveNewSamplesToPitchBuffer(originalNumOutputSamples);
        // Leave at least one pitch sample in the buffer
        for(position = 0; position < numPitchSamples - 1; position++) {
            while((oldRatePosition + 1)*newSampleRate > newRatePosition*oldSampleRate) {
                enlargeOutputBufferIfNeeded(1);
                for(int i = 0; i < numChannels; i++) {
                    outputBuffer[numOutputSamples*numChannels + i] = interpolate(pitchBuffer,
                            position * numChannels + i, oldSampleRate, newSampleRate);
                }
                newRatePosition++;
                numOutputSamples++;
            }
            oldRatePosition++;
            if(oldRatePosition == oldSampleRate) {
                oldRatePosition = 0;
                if(newRatePosition != newSampleRate) {
                    System.out.printf("Assertion failed: newRatePosition != newSampleRate\n");
                    assert false;
                }
                newRatePosition = 0;
            }
        }
        removePitchSamples(numPitchSamples - 1);
    }


    // Skip over a pitch period, and copy period/speed samples to the output
    private int skipPitchPeriod(
            short samples[],
            int position,
            float speed,
            int period)
    {
        int newSamples;

        if(speed >= 2.0f) {
            newSamples = (int)(period/(speed - 1.0f));
        } else {
            newSamples = period;
            remainingInputToCopy = (int)(period*(2.0f - speed)/(speed - 1.0f));
        }
        enlargeOutputBufferIfNeeded(newSamples);
        overlapAdd(newSamples, numChannels, outputBuffer, numOutputSamples, samples, position,
                samples, position + period);
        numOutputSamples += newSamples;
        return newSamples;
    }

    // Insert a pitch period, and determine how much input to copy directly.
    private int insertPitchPeriod(
            short samples[],
            int position,
            float speed,
            int period)
    {
        int newSamples;

        if(speed < 0.5f) {
            newSamples = (int)(period * speed /(1.0f - speed));
        } else {
            newSamples = period;
            remainingInputToCopy = (int)(period * (2.0f * speed - 1.0f) / (1.0f - speed));
        }
        enlargeOutputBufferIfNeeded(period + newSamples);
        move(outputBuffer, numOutputSamples, samples, position, period);
        overlapAdd(newSamples, numChannels, outputBuffer, numOutputSamples + period, samples,
                position + period, samples, position);
        numOutputSamples += period + newSamples;
        return newSamples;
    }

    // Resample as many pitch periods as we have buffered on the input.  Return 0 if
    // we fail to resize an input or output buffer.  Also scale the output by the volume.
    private void changeSpeed(float speed) {
        if (numInputSamples < maxRequired) {
            return;
        }
        int numSamples = numInputSamples;
        int position = 0;
        do {
            if (remainingInputToCopy > 0) {
                position += copyInputToOutput(position);
            } else {
                int period = findPitchPeriod(inputBuffer, position, true);
                if (speed > 1.0) {
                    position += period + skipPitchPeriod(inputBuffer, position, speed, period);
                } else {
                    position += insertPitchPeriod(inputBuffer, position, speed, period);
                }
            }
        } while (position + maxRequired <= numSamples);

        removeInputSamples(position);
    }

    // Resample as many pitch periods as we have buffered on the input.  Scale the output by the volume.
    private void processStreamInput()
    {
        int originalNumOutputSamples = numOutputSamples;
        float s = speed/pitch;
        float r = rate;

        if(!useChordPitch) {
            r *= pitch;
        }
        if(s > 1.00001 || s < 0.99999) {
            changeSpeed(s);
        } else {
            copyToOutput(inputBuffer, 0, numInputSamples);
            numInputSamples = 0;
        }
        if(useChordPitch) {
            if(pitch != 1.0f) {
                adjustPitch(originalNumOutputSamples);
            }
        } else if(r != 1.0f) {
            adjustRate(r, originalNumOutputSamples);
        }
        if(volume != 1.0f) {
            // Adjust output volume.
            scaleSamples(outputBuffer, originalNumOutputSamples, numOutputSamples - originalNumOutputSamples,
                    volume);
        }
    }

    // Write floating point data to the input buffer and process it.
    public void writeFloatToStream(
            float samples[],
            int numSamples)
    {
        addFloatSamplesToInputBuffer(samples, numSamples);
        processStreamInput();
    }

    // Write the data to the input stream, and process it.
    public void writeShortToStream(
            short samples[],
            int numSamples)
    {
        addShortSamplesToInputBuffer(samples, numSamples);
        processStreamInput();
    }

    // Simple wrapper around sonicWriteFloatToStream that does the unsigned byte to short
    // conversion for you.
    private void writeUnsignedByteToStream(
            byte samples[],
            int numSamples)
    {
        addUnsignedByteSamplesToInputBuffer(samples, numSamples);
        processStreamInput();
    }

    // Simple wrapper around sonicWriteBytesToStream that does the byte to 16-bit LE conversion.
    private void writeBytesToStream(
            byte inBuffer[],
            int numBytes)
    {
        addBytesToInputBuffer(inBuffer, numBytes);
        processStreamInput();
    }

    // This is a non-stream oriented interface to just change the speed of a sound sample
    private static int changeFloatSpeed(
            float samples[],
            int numSamples,
            float speed,
            float pitch,
            float rate,
            float volume,
            boolean useChordPitch,
            int sampleRate,
            int numChannels)
    {
        SonicAudioProcessor stream = new SonicAudioProcessor(sampleRate, numChannels);

        stream.setSpeed(speed);
        stream.setPitch(pitch);
        stream.setRate(rate);
        stream.setVolume(volume);
        stream.setChordPitch(useChordPitch);
        stream.writeFloatToStream(samples, numSamples);
        stream.flushStream();
        numSamples = stream.samplesAvailable();
        stream.readFloatFromStream(samples, numSamples);
        return numSamples;
    }

    /* This is a non-stream oriented interface to just change the speed of a sound sample */
    private int sonicChangeShortSpeed(
            short samples[],
            int numSamples,
            float speed,
            float pitch,
            float rate,
            float volume,
            boolean useChordPitch,
            int sampleRate,
            int numChannels)
    {
        SonicAudioProcessor stream = new SonicAudioProcessor(sampleRate, numChannels);

        stream.setSpeed(speed);
        stream.setPitch(pitch);
        stream.setRate(rate);
        stream.setVolume(volume);
        stream.setChordPitch(useChordPitch);
        stream.writeShortToStream(samples, numSamples);
        stream.flushStream();
        numSamples = stream.samplesAvailable();
        stream.readShortFromStream(samples, numSamples);
        return numSamples;
    }
}