89 lines
2.7 KiB
C++
Executable File
89 lines
2.7 KiB
C++
Executable File
/*
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AudioOutputMixer
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Simple mixer which can combine multiple inputs to a single output stream
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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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#ifndef _AUDIOOUTPUTMIXER_H
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#define _AUDIOOUTPUTMIXER_H
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#include "AudioOutput.h"
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class AudioOutputMixer;
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// The output stub exported by the mixer for use by the generator
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class AudioOutputMixerStub : public AudioOutput
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{
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public:
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AudioOutputMixerStub(AudioOutputMixer *sink, int id);
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virtual ~AudioOutputMixerStub() override;
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virtual bool SetRate(int hz) override;
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virtual bool SetBitsPerSample(int bits) override;
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virtual bool SetChannels(int channels) override;
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virtual bool begin() override;
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virtual bool ConsumeSample(int16_t sample[2]) override;
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virtual bool stop() override;
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protected:
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AudioOutputMixer *parent;
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int id;
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};
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// Single mixer object per output
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class AudioOutputMixer : public AudioOutput
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{
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public:
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AudioOutputMixer(int samples, AudioOutput *sink);
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virtual ~AudioOutputMixer() override;
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virtual bool SetRate(int hz) override;
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virtual bool SetBitsPerSample(int bits) override;
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virtual bool SetChannels(int channels) override;
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virtual bool begin() override;
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virtual bool ConsumeSample(int16_t sample[2]) override;
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virtual bool stop() override;
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virtual bool loop() override; // Send all existing samples we can to I2S
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AudioOutputMixerStub *NewInput(); // Get a new stub to pass to a generator
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// Stub called functions
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friend class AudioOutputMixerStub;
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private:
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void RemoveInput(int id);
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bool SetRate(int hz, int id);
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bool SetBitsPerSample(int bits, int id);
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bool SetChannels(int channels, int id);
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bool begin(int id);
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bool ConsumeSample(int16_t sample[2], int id);
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bool stop(int id);
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protected:
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enum { maxStubs = 8 };
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AudioOutput *sink;
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bool sinkStarted;
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int16_t buffSize;
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int32_t *leftAccum;
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int32_t *rightAccum;
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bool stubAllocated[maxStubs];
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bool stubRunning[maxStubs];
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int16_t writePtr[maxStubs]; // Array of pointers for allocated stubs
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int16_t readPtr;
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};
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#endif
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