//
// SampleSourceSilence.c - MrsWatson
// Created by Nik Reiman on 1/5/12.
// Copyright (c) 2012 Teragon Audio. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
//   this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright notice,
//   this list of conditions and the following disclaimer in the documentation
//   and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//

#include <stdio.h>
#include <stdlib.h>

#include "audio/AudioSettings.h"
#include "io/SampleSource.h"
#include "logging/EventLogger.h"

static boolByte _openSampleSourceSilence(void *sampleSourcePtr, const SampleSourceOpenAs openAs)
{
    SampleSource sampleSource = (SampleSource)sampleSourcePtr;
    sampleSource->openedAs = openAs;
    return true;
}

static void _closeSampleSourceSilence(void *sampleSourcePtr)
{
}

static boolByte _readBlockFromSilence(void *sampleSourcePtr, SampleBuffer sampleBuffer)
{
    unsigned long samplesRead = sampleBuffer->blocksize * sampleBuffer->numChannels;
    sampleBufferClear(sampleBuffer);
    ((SampleSource)sampleSourcePtr)->numSamplesProcessed += sampleBuffer->blocksize * sampleBuffer->numChannels;
    logDebug("Read %d samples from silence source", samplesRead);
    return true;
}

static boolByte _writeBlockToSilence(void *sampleSourcePtr, const SampleBuffer sampleBuffer)
{
    unsigned long samplesWritten = sampleBuffer->blocksize * sampleBuffer->numChannels;
    ((SampleSource)sampleSourcePtr)->numSamplesProcessed += samplesWritten;
    logDebug("Wrote %d samples to silence source", samplesWritten);
    return true;
}

static void _freeInputSourceDataSilence(void *sampleSourceDataPtr)
{
}

SampleSource _newSampleSourceSilence(void)
{
    SampleSource sampleSource = (SampleSource)malloc(sizeof(SampleSourceMembers));

    sampleSource->sampleSourceType = SAMPLE_SOURCE_TYPE_SILENCE;
    sampleSource->openedAs = SAMPLE_SOURCE_OPEN_NOT_OPENED;
    sampleSource->sourceName = newCharString();
    charStringCopyCString(sampleSource->sourceName, "(silence)");
    sampleSource->numSamplesProcessed = 0;

    sampleSource->openSampleSource = _openSampleSourceSilence;
    sampleSource->closeSampleSource = _closeSampleSourceSilence;
    sampleSource->readSampleBlock = _readBlockFromSilence;
    sampleSource->writeSampleBlock = _writeBlockToSilence;
    sampleSource->freeSampleSourceData = _freeInputSourceDataSilence;

    return sampleSource;
}