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/*
* Copyright 2023 jacqueline <me@jacqueline.id.au>
*
* SPDX-License-Identifier: GPL-3.0-only
*/
#pragma once
#include <stdint.h>
#include <cstdint>
#include "esp_heap_caps.h"
#include "freertos/FreeRTOS.h"
namespace audio {
/*
* Interface for classes that use PCM samples to create noises for the user.
*
* These classes do not generally have any specific task for their work, and
* simply help to mediate working out the correct PCM format, and then sending
* those samples to the appropriate hardware driver.
*/
class IAudioOutput {
public:
IAudioOutput() : mode_(Modes::kOff) {}
virtual ~IAudioOutput() {}
enum class Modes {
kOff,
kOnPaused,
kOnPlaying,
};
/*
* Indicates whether this output is currently being sent samples. If this is
* false, the output should place itself into a low power state.
*/
auto mode(Modes m) -> void {
if (mode_ == m) {
return;
}
changeMode(m);
mode_ = m;
}
auto mode() -> Modes { return mode_; }
virtual auto SetVolumeImbalance(int_fast8_t balance) -> void = 0;
virtual auto SetVolume(uint16_t) -> void = 0;
virtual auto GetVolume() -> uint16_t = 0;
virtual auto GetVolumePct() -> uint_fast8_t = 0;
virtual auto GetVolumeDb() -> int_fast16_t = 0;
virtual auto SetVolumePct(uint_fast8_t) -> bool = 0;
virtual auto SetVolumeDb(int_fast16_t) -> bool = 0;
virtual auto AdjustVolumeUp() -> bool = 0;
virtual auto AdjustVolumeDown() -> bool = 0;
struct Format {
uint32_t sample_rate;
uint_fast8_t num_channels;
uint_fast8_t bits_per_sample;
bool operator==(const Format&) const = default;
};
virtual auto PrepareFormat(const Format&) -> Format = 0;
virtual auto Configure(const Format& format) -> void = 0;
protected:
Modes mode_;
virtual auto changeMode(Modes new_mode) -> void = 0;
};
} // namespace audio
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