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/*
* Copyright 2023 jacqueline <me@jacqueline.id.au>
*
* SPDX-License-Identifier: GPL-3.0-only
*/
#include "audio_task.hpp"
#include <stdlib.h>
#include <algorithm>
#include <cmath>
#include <cstddef>
#include <cstdint>
#include <cstring>
#include <deque>
#include <memory>
#include <variant>
#include "audio_decoder.hpp"
#include "audio_events.hpp"
#include "audio_fsm.hpp"
#include "audio_sink.hpp"
#include "audio_source.hpp"
#include "cbor.h"
#include "codec.hpp"
#include "esp_err.h"
#include "esp_heap_caps.h"
#include "esp_log.h"
#include "event_queue.hpp"
#include "fatfs_audio_input.hpp"
#include "freertos/portmacro.h"
#include "freertos/projdefs.h"
#include "freertos/queue.h"
#include "freertos/ringbuf.h"
#include "pipeline.hpp"
#include "sample.hpp"
#include "sink_mixer.hpp"
#include "span.hpp"
#include "arena.hpp"
#include "audio_element.hpp"
#include "chunk.hpp"
#include "stream_event.hpp"
#include "stream_info.hpp"
#include "stream_message.hpp"
#include "sys/_stdint.h"
#include "tasks.hpp"
#include "track.hpp"
#include "types.hpp"
#include "ui_fsm.hpp"
namespace audio {
static const char* kTag = "audio_dec";
static constexpr std::size_t kCodecBufferLength = 240 * 4;
Timer::Timer(const StreamInfo::Pcm& format, const Duration& duration)
: format_(format), current_seconds_(0), current_sample_in_second_(0) {
switch (duration.src) {
case Duration::Source::kLibTags:
ESP_LOGI(kTag, "using duration from libtags");
total_duration_seconds_ = duration.duration;
break;
case Duration::Source::kCodec:
ESP_LOGI(kTag, "using duration from decoder");
total_duration_seconds_ = duration.duration;
break;
case Duration::Source::kFileSize:
ESP_LOGW(kTag, "calculating duration from filesize");
total_duration_seconds_ =
bytes_to_samples(duration.duration) / format_.sample_rate;
break;
}
}
auto Timer::AddBytes(std::size_t bytes) -> void {
bool incremented = false;
current_sample_in_second_ += bytes_to_samples(bytes);
while (current_sample_in_second_ >= format_.sample_rate) {
current_seconds_++;
current_sample_in_second_ -= format_.sample_rate;
incremented = true;
}
if (incremented) {
if (total_duration_seconds_ < current_seconds_) {
total_duration_seconds_ = current_seconds_;
}
PlaybackUpdate ev{.seconds_elapsed = current_seconds_,
.seconds_total = total_duration_seconds_};
events::Audio().Dispatch(ev);
events::Ui().Dispatch(ev);
}
}
auto Timer::bytes_to_samples(uint32_t bytes) -> uint32_t {
uint32_t samples = bytes;
samples /= format_.channels;
// Samples must be aligned to 16 bits. The number of actual bytes per
// sample is therefore the bps divided by 16, rounded up (align to word),
// times two (convert to bytes).
uint8_t bytes_per_sample = ((format_.bits_per_sample + 16 - 1) / 16) * 2;
samples /= bytes_per_sample;
return samples;
}
auto AudioTask::Start(IAudioSource* source, IAudioSink* sink) -> AudioTask* {
AudioTask* task = new AudioTask(source, sink);
// Pin to CORE1 because codecs should be fixed point anyway, and being on
// the opposite core to the mixer maximises throughput in the worst case
// (some heavy codec like opus + resampling for bluetooth).
tasks::StartPersistent<tasks::Type::kAudio>(1, [=]() { task->Main(); });
return task;
}
AudioTask::AudioTask(IAudioSource* source, IAudioSink* sink)
: source_(source),
sink_(sink),
codec_(),
mixer_(new SinkMixer(sink)),
timer_(),
current_format_() {
codec_buffer_ = {
reinterpret_cast<sample::Sample*>(heap_caps_calloc(
kCodecBufferLength, sizeof(sample::Sample), MALLOC_CAP_SPIRAM)),
kCodecBufferLength};
}
void AudioTask::Main() {
for (;;) {
if (source_->HasNewStream() || !stream_) {
std::shared_ptr<codecs::IStream> new_stream = source_->NextStream();
if (new_stream && BeginDecoding(new_stream)) {
stream_ = new_stream;
} else {
continue;
}
}
if (ContinueDecoding()) {
events::Audio().Dispatch(internal::InputFileFinished{});
stream_.reset();
}
}
}
auto AudioTask::BeginDecoding(std::shared_ptr<codecs::IStream> stream) -> bool {
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;
}
current_sink_format_ = IAudioSink::Format{
.sample_rate = open_res->sample_rate_hz,
.num_channels = open_res->num_channels,
.bits_per_sample = 32,
};
ESP_LOGI(kTag, "stream started ok");
events::Audio().Dispatch(internal::InputFileOpened{});
return true;
}
auto AudioTask::ContinueDecoding() -> bool {
auto res = codec_->DecodeTo(codec_buffer_);
if (res.has_error()) {
return true;
}
if (res->samples_written > 0) {
mixer_->MixAndSend(codec_buffer_.first(res->samples_written),
current_sink_format_.value(), res->is_stream_finished);
}
return res->is_stream_finished;
}
} // namespace audio
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