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/*
* Copyright 2023 jacqueline <me@jacqueline.id.au>
*
* SPDX-License-Identifier: GPL-3.0-only
*/
#include "audio_decoder.hpp"
#include <cstdint>
#include <cstdlib>
#include <algorithm>
#include <cmath>
#include <cstddef>
#include <cstdint>
#include <cstring>
#include <deque>
#include <memory>
#include <variant>
#include "cbor.h"
#include "esp_err.h"
#include "esp_heap_caps.h"
#include "esp_log.h"
#include "freertos/portmacro.h"
#include "freertos/projdefs.h"
#include "freertos/queue.h"
#include "freertos/ringbuf.h"
#include "i2s_dac.hpp"
#include "span.hpp"
#include "audio_converter.hpp"
#include "audio_events.hpp"
#include "audio_fsm.hpp"
#include "audio_sink.hpp"
#include "audio_source.hpp"
#include "codec.hpp"
#include "event_queue.hpp"
#include "fatfs_audio_input.hpp"
#include "sample.hpp"
#include "tasks.hpp"
#include "track.hpp"
#include "types.hpp"
#include "ui_fsm.hpp"
namespace audio {
[[maybe_unused]] static const char* kTag = "audio_dec";
static constexpr std::size_t kCodecBufferLength =
drivers::kI2SBufferLengthFrames * sizeof(sample::Sample) * 2;
Timer::Timer(std::shared_ptr<Track> t,
const codecs::ICodec::OutputFormat& format)
: track_(t),
current_seconds_(0),
current_sample_in_second_(0),
samples_per_second_(format.sample_rate_hz * format.num_channels),
total_duration_seconds_(format.total_samples.value_or(0) /
format.num_channels / format.sample_rate_hz) {
track_->duration = total_duration_seconds_;
}
auto Timer::AddSamples(std::size_t samples) -> void {
bool incremented = false;
current_sample_in_second_ += samples;
while (current_sample_in_second_ >= samples_per_second_) {
current_seconds_++;
current_sample_in_second_ -= samples_per_second_;
incremented = true;
}
if (incremented) {
if (total_duration_seconds_ < current_seconds_) {
total_duration_seconds_ = current_seconds_;
track_->duration = total_duration_seconds_;
}
PlaybackUpdate ev{.seconds_elapsed = current_seconds_, .track = track_};
events::Audio().Dispatch(ev);
events::Ui().Dispatch(ev);
}
}
auto Decoder::Start(std::shared_ptr<IAudioSource> source,
std::shared_ptr<SampleConverter> sink) -> Decoder* {
Decoder* task = new Decoder(source, sink);
tasks::StartPersistent<tasks::Type::kAudioDecoder>([=]() { task->Main(); });
return task;
}
Decoder::Decoder(std::shared_ptr<IAudioSource> source,
std::shared_ptr<SampleConverter> mixer)
: source_(source),
converter_(mixer),
codec_(),
timer_(),
current_format_() {
ESP_LOGI(kTag, "allocating codec buffer, %u KiB", kCodecBufferLength / 1024);
codec_buffer_ = {
reinterpret_cast<sample::Sample*>(heap_caps_calloc(
kCodecBufferLength, sizeof(sample::Sample), MALLOC_CAP_DMA)),
kCodecBufferLength};
}
void Decoder::Main() {
for (;;) {
if (source_->HasNewStream() || !stream_) {
std::shared_ptr<TaggedStream> new_stream = source_->NextStream();
ESP_LOGI(kTag, "decoder has new stream");
if (new_stream && BeginDecoding(new_stream)) {
stream_ = new_stream;
} else {
continue;
}
}
if (ContinueDecoding()) {
events::Audio().Dispatch(internal::InputFileFinished{});
stream_.reset();
}
}
}
auto Decoder::BeginDecoding(std::shared_ptr<TaggedStream> stream) -> bool {
// Ensure any previous codec is freed before creating a new one.
codec_.reset();
codec_.reset(codecs::CreateCodecForType(stream->type()).value_or(nullptr));
if (!codec_) {
ESP_LOGE(kTag, "no codec found");
return false;
}
auto open_res = codec_->OpenStream(stream);
if (open_res.has_error()) {
ESP_LOGE(kTag, "codec failed to start: %s",
codecs::ICodec::ErrorString(open_res.error()).c_str());
return false;
}
stream->SetPreambleFinished();
if (open_res->total_samples) {
timer_.reset(new Timer(std::shared_ptr<Track>{new Track{
.tags = stream->tags(),
.db_info = {},
.bitrate_kbps = 0,
.encoding = stream->type(),
}},
open_res.value()));
} else {
timer_.reset();
}
current_sink_format_ = IAudioOutput::Format{
.sample_rate = open_res->sample_rate_hz,
.num_channels = open_res->num_channels,
.bits_per_sample = 16,
};
ESP_LOGI(kTag, "stream started ok");
events::Audio().Dispatch(internal::InputFileOpened{});
return true;
}
auto Decoder::ContinueDecoding() -> bool {
auto res = codec_->DecodeTo(codec_buffer_);
if (res.has_error()) {
return true;
}
if (res->samples_written > 0) {
converter_->ConvertSamples(codec_buffer_.first(res->samples_written),
current_sink_format_.value(),
res->is_stream_finished);
}
if (timer_) {
timer_->AddSamples(res->samples_written);
}
if (res->is_stream_finished) {
codec_.reset();
}
return res->is_stream_finished;
}
} // namespace audio
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