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//
// SampleBuffer.c - MrsWatson
// Created by Nik Reiman on 1/2/12.
// 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 <string.h>
#include <math.h>
#include "audio/AudioSettings.h"
#include "audio/SampleBuffer.h"
#include "base/Endian.h"
#include "logging/EventLogger.h"
#include "SampleBuffer.h"
SampleBuffer newSampleBuffer(ChannelCount numChannels, SampleCount blocksize)
{
SampleBuffer sampleBuffer = (SampleBuffer)malloc(sizeof(SampleBufferMembers));
sampleBuffer->numChannels = numChannels;
sampleBuffer->blocksize = blocksize;
sampleBuffer->samples = (Samples *)malloc(sizeof(Samples) * numChannels);
for (ChannelCount i = 0; i < numChannels; i++) {
sampleBuffer->samples[i] = (Samples)malloc(sizeof(Sample) * blocksize);
}
sampleBufferClear(sampleBuffer);
return sampleBuffer;
}
void sampleBufferClear(SampleBuffer self)
{
for (ChannelCount i = 0; i < self->numChannels; i++) {
memset(self->samples[i], 0, sizeof(Sample) * self->blocksize);
}
}
boolByte sampleBufferCopyAndMapChannelsWithOffset(SampleBuffer destinationBuffer,
SampleCount destinationOffset,
const SampleBuffer sourceBuffer,
SampleCount sourceOffset,
SampleCount numberOfFrames)
{
// Definitely not supported.
if (destinationBuffer->blocksize < destinationOffset + numberOfFrames) {
logInternalError("Destination buffer size %d < %d", destinationBuffer->blocksize, destinationOffset + numberOfFrames);
return false;
}
// Definitely not supported.
if (sourceBuffer->blocksize < sourceOffset + numberOfFrames) {
logInternalError("Source buffer size %d < %d", sourceBuffer->blocksize, sourceOffset + numberOfFrames);
return false;
}
if (sourceBuffer->numChannels != destinationBuffer->numChannels) {
logDebug("Mapping channels from %d -> %d", sourceBuffer->numChannels, destinationBuffer->numChannels);
}
// If the other buffer is bigger (or the same size) as this buffer, then only
// copy up to the channel count of this buffer. Any other data will be lost,
// sorry about that!
if (sourceBuffer->numChannels >= destinationBuffer->numChannels) {
for (ChannelCount i = 0; i < destinationBuffer->numChannels; ++i) {
memcpy(destinationBuffer->samples[i] + destinationOffset, sourceBuffer->samples[i] + sourceOffset, sizeof(Sample) * numberOfFrames);
}
}
// But if this buffer is bigger than the other buffer, then copy all channels
// to this one. For example, if this buffer is 4 channels and the other buffer
// is 2 channels, then we copy the stereo pair to this channel (L R L R).
else {
for (ChannelCount i = 0; i < destinationBuffer->numChannels; ++i) {
if (sourceBuffer->numChannels > 0) {
memcpy(destinationBuffer->samples[i] + destinationOffset,
sourceBuffer->samples[i % sourceBuffer->numChannels] + sourceOffset,
sizeof(Sample) * numberOfFrames);
} else {
// If the other buffer has zero channels just clear this buffer.
memset(destinationBuffer->samples[i] + destinationOffset, 0, sizeof(Sample) * numberOfFrames);
}
}
}
return true;
}
boolByte sampleBufferCopyAndMapChannels(SampleBuffer self, const SampleBuffer buffer)
{
// Definitely not supported, otherwise it would be hard to deal with partial
// copies and so forth.
if (self->blocksize != buffer->blocksize) {
logInternalError("Source and destination buffer are not the same size");
return false;
}
return sampleBufferCopyAndMapChannelsWithOffset(self, 0, buffer, 0, self->blocksize);
}
void sampleBufferCopyPcmSamples(SampleBuffer self, const short *inPcmSamples)
{
const unsigned int numChannels = self->numChannels;
const unsigned long numInterlacedSamples = numChannels * self->blocksize;
unsigned int currentInterlacedSample = 0;
unsigned int currentDeinterlacedSample = 0;
unsigned int currentChannel;
while (currentInterlacedSample < numInterlacedSamples) {
for (currentChannel = 0; currentChannel < numChannels; ++currentChannel) {
Sample convertedSample = (Sample)inPcmSamples[currentInterlacedSample++] / 32767.0f;
self->samples[currentChannel][currentDeinterlacedSample] = convertedSample;
}
++currentDeinterlacedSample;
}
}
void sampleBufferGetPcmSamples(const SampleBuffer self, short *outPcmSamples, boolByte flipEndian)
{
const unsigned long blocksize = self->blocksize;
const unsigned int numChannels = self->numChannels;
unsigned int currentInterlacedSample = 0;
unsigned int currentSample = 0;
unsigned int currentChannel = 0;
short shortValue;
Sample sample;
for (currentSample = 0; currentSample < blocksize; ++currentSample) {
for (currentChannel = 0; currentChannel < numChannels; ++currentChannel) {
sample = self->samples[currentChannel][currentSample];
shortValue = (short)(sample * 32767.0f);
if (flipEndian) {
outPcmSamples[currentInterlacedSample++] = flipShortEndian(shortValue);
} else {
outPcmSamples[currentInterlacedSample++] = shortValue;
}
}
}
}
void freeSampleBuffer(SampleBuffer self)
{
if (self == NULL) {
return;
}
for (ChannelCount channel = 0; channel < self->numChannels; ++channel) {
free(self->samples[channel]);
}
free(self->samples);
free(self);
}
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