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90 lines
2.2 KiB
C++
Executable File
90 lines
2.2 KiB
C++
Executable File
/*
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AudioOutputBuffer
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Adds additional bufferspace to the output chain
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Copyright (C) 2017 Earle F. Philhower, III
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <Arduino.h>
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#include "AudioOutputBuffer.h"
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AudioOutputBuffer::AudioOutputBuffer(int buffSizeSamples, AudioOutput *dest)
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{
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buffSize = buffSizeSamples;
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leftSample = (int16_t*)malloc(sizeof(int16_t) * buffSize);
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rightSample = (int16_t*)malloc(sizeof(int16_t) * buffSize);
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writePtr = 0;
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readPtr = 0;
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sink = dest;
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}
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AudioOutputBuffer::~AudioOutputBuffer()
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{
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free(leftSample);
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free(rightSample);
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}
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bool AudioOutputBuffer::SetRate(int hz)
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{
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return sink->SetRate(hz);
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}
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bool AudioOutputBuffer::SetBitsPerSample(int bits)
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{
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return sink->SetBitsPerSample(bits);
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}
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bool AudioOutputBuffer::SetChannels(int channels)
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{
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return sink->SetChannels(channels);
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}
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bool AudioOutputBuffer::begin()
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{
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filled = false;
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return sink->begin();
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}
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bool AudioOutputBuffer::ConsumeSample(int16_t sample[2])
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{
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// First, try and fill I2S...
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if (filled) {
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while (readPtr != writePtr) {
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int16_t s[2] = {leftSample[readPtr], rightSample[readPtr]};
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if (!sink->ConsumeSample(s)) break; // Can't stuff any more in I2S...
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readPtr = (readPtr + 1) % buffSize;
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}
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}
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// Now, do we have space for a new sample?
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int nextWritePtr = (writePtr + 1) % buffSize;
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if (nextWritePtr == readPtr) {
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filled = true;
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return false;
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}
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leftSample[writePtr] = sample[LEFTCHANNEL];
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rightSample[writePtr] = sample[RIGHTCHANNEL];
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writePtr = nextWritePtr;
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return true;
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}
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bool AudioOutputBuffer::stop()
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{
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return sink->stop();
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}
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