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70 lines
1.5 KiB
70 lines
1.5 KiB
/*
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* Copyright 2023 jacqueline <me@jacqueline.id.au>
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*
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* SPDX-License-Identifier: GPL-3.0-only
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*/
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#pragma once
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#include <sys/_stdint.h>
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#include <cstdint>
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#include <memory>
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#include "resample.hpp"
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#include "sample.hpp"
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#include "audio_decoder.hpp"
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#include "audio_sink.hpp"
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#include "audio_source.hpp"
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#include "codec.hpp"
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#include "pipeline.hpp"
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#include "stream_info.hpp"
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namespace audio {
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/*
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* Handles the final downmix + resample + quantisation stage of audio,
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* generation sending the result directly to an IAudioSink.
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*/
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class SinkMixer {
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public:
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SinkMixer(StreamBufferHandle_t dest);
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~SinkMixer();
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auto MixAndSend(InputStream&, const StreamInfo::Pcm&) -> std::size_t;
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private:
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auto Main() -> void;
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auto SetTargetFormat(const StreamInfo::Pcm& format) -> void;
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auto HandleBytes() -> void;
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auto Resample(InputStream&, OutputStream&) -> bool;
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auto ApplyDither(cpp::span<sample::Sample> samples, uint_fast8_t bits) -> void;
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auto Downscale(cpp::span<sample::Sample>, cpp::span<int16_t>) -> void;
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enum class Command {
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kReadBytes,
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kSetSourceFormat,
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kSetTargetFormat,
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};
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struct Args {
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Command cmd;
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StreamInfo::Pcm format;
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};
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QueueHandle_t commands_;
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SemaphoreHandle_t is_idle_;
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std::unique_ptr<Resampler> resampler_;
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std::unique_ptr<RawStream> input_stream_;
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std::unique_ptr<RawStream> resampled_stream_;
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StreamInfo::Pcm target_format_;
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StreamBufferHandle_t source_;
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StreamBufferHandle_t sink_;
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};
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} // namespace audio
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