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#include "audio_playback.hpp"
#include <algorithm>
#include <cstdint>
#include <memory>
#include <string_view>
#include "audio_decoder.hpp"
#include "audio_task.hpp"
#include "chunk.hpp"
#include "fatfs_audio_input.hpp"
#include "freertos/portmacro.h"
#include "gpio_expander.hpp"
#include "i2s_audio_output.hpp"
#include "storage.hpp"
#include "stream_buffer.hpp"
#include "stream_info.hpp"
#include "stream_message.hpp"
namespace audio {
// TODO: idk
static const std::size_t kMinElementBufferSize = 1024;
auto AudioPlayback::create(drivers::GpioExpander* expander,
std::shared_ptr<drivers::SdStorage> storage)
-> cpp::result<std::unique_ptr<AudioPlayback>, Error> {
// Create everything
auto source = std::make_shared<FatfsAudioInput>(storage);
auto codec = std::make_shared<AudioDecoder>();
auto sink_res = I2SAudioOutput::create(expander);
if (sink_res.has_error()) {
return cpp::fail(ERR_INIT_ELEMENT);
}
auto sink = sink_res.value();
auto playback = std::make_unique<AudioPlayback>();
// Configure the pipeline
source->InputBuffer(&playback->stream_start_);
sink->OutputBuffer(&playback->stream_end_);
playback->ConnectElements(source.get(), codec.get());
playback->ConnectElements(codec.get(), sink.get());
// Launch!
playback->element_handles_.push_back(StartAudioTask("src", source));
playback->element_handles_.push_back(StartAudioTask("dec", codec));
playback->element_handles_.push_back(StartAudioTask("sink", sink));
return playback;
}
// TODO(jacqueline): think about sizes
AudioPlayback::AudioPlayback()
: stream_start_(128, 128), stream_end_(128, 128) {}
AudioPlayback::~AudioPlayback() {
for (auto& element : element_handles_) {
element->Quit();
}
}
auto AudioPlayback::Play(const std::string& filename) -> void {
StreamInfo info;
info.Path(filename);
std::array<std::byte, 128> dest;
auto len = WriteMessage(
TYPE_STREAM_INFO, [&](auto enc) { return info.Encode(enc); }, dest);
if (len.has_error()) {
// TODO.
return;
}
// TODO: short delay, return error on fail
xMessageBufferSend(*stream_start_.Handle(), dest.data(), len.value(),
portMAX_DELAY);
}
auto AudioPlayback::ConnectElements(IAudioElement* src, IAudioElement* sink)
-> void {
std::size_t chunk_size =
std::max(src->InputMinChunkSize(), sink->InputMinChunkSize());
std::size_t buffer_size = std::max(kMinElementBufferSize, chunk_size * 2);
auto buffer = std::make_unique<StreamBuffer>(chunk_size, buffer_size);
src->OutputBuffer(buffer.get());
sink->OutputBuffer(buffer.get());
element_buffers_.push_back(std::move(buffer));
}
} // namespace audio
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