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#include "audio_task.hpp"
#include <stdlib.h>
#include <algorithm>
#include <cstddef>
#include <cstdint>
#include <deque>
#include <memory>
#include <variant>
#include "audio_sink.hpp"
#include "cbor.h"
#include "dac.hpp"
#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 "pipeline.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"
namespace audio {
namespace task {
static const char* kTag = "task";
static const std::size_t kStackSize = 24 * 1024;
static const std::size_t kDrainStackSize = 1024;
auto StartPipeline(Pipeline* pipeline, IAudioSink* sink) -> void {
// Newly created task will free this.
AudioTaskArgs* args = new AudioTaskArgs{.pipeline = pipeline, .sink = sink};
ESP_LOGI(kTag, "starting audio pipeline task");
xTaskCreate(&AudioTaskMain, "pipeline", kStackSize, args,
kTaskPriorityAudioPipeline, NULL);
}
auto StartDrain(IAudioSink* sink) -> void {
auto command = new std::atomic<Command>(PLAY);
// Newly created task will free this.
AudioDrainArgs* drain_args = new AudioDrainArgs{
.sink = sink,
.command = command,
};
ESP_LOGI(kTag, "starting audio drain task");
xTaskCreate(&AudioDrainMain, "drain", kDrainStackSize, drain_args,
kTaskPriorityAudioDrain, NULL);
}
void AudioTaskMain(void* args) {
// Nest the body within an additional scope to ensure that destructors are
// called before the task quits.
{
AudioTaskArgs* real_args = reinterpret_cast<AudioTaskArgs*>(args);
std::unique_ptr<Pipeline> pipeline(real_args->pipeline);
IAudioSink* sink = real_args->sink;
delete real_args;
std::optional<StreamInfo::Format> output_format;
std::vector<Pipeline*> elements = pipeline->GetIterationOrder();
std::size_t max_inputs =
(*std::max_element(elements.begin(), elements.end(),
[](Pipeline const* first, Pipeline const* second) {
return first->NumInputs() < second->NumInputs();
}))
->NumInputs();
// We need to be able to simultaneously map all of an element's inputs, plus
// its output. So preallocate that many ranges.
std::vector<MappableRegion<kPipelineBufferSize>> in_regions(max_inputs);
MappableRegion<kPipelineBufferSize> out_region;
std::for_each(in_regions.begin(), in_regions.end(),
[](const auto& region) { assert(region.is_valid); });
assert(out_region.is_valid);
// Each element has exactly one output buffer.
std::vector<HimemAlloc<kPipelineBufferSize>> buffers(elements.size());
std::vector<StreamInfo> buffer_infos(buffers.size());
std::for_each(buffers.begin(), buffers.end(),
[](const HimemAlloc<kPipelineBufferSize>& alloc) {
assert(alloc.is_valid);
});
bool playing = true;
bool quit = false;
while (!quit) {
if (playing) {
for (int i = 0; i < elements.size(); i++) {
std::vector<RawStream> raw_in_streams;
elements.at(i)->InStreams(&in_regions, &raw_in_streams);
RawStream raw_out_stream = elements.at(i)->OutStream(&out_region);
// Crop the input and output streams to the ranges that are safe to
// touch. For the input streams, this is the region that contains
// data. For the output stream, this is the region that does *not*
// already contain data.
std::vector<InputStream> in_streams;
std::for_each(raw_in_streams.begin(), raw_in_streams.end(),
[&](RawStream& s) { in_streams.emplace_back(&s); });
OutputStream out_stream(&raw_out_stream);
elements.at(i)->OutputElement()->Process(in_streams, &out_stream);
std::for_each(in_regions.begin(), in_regions.end(),
[](auto&& r) { r.Unmap(); });
out_region.Unmap();
}
RawStream raw_sink_stream = elements.front()->OutStream(&out_region);
InputStream sink_stream(&raw_sink_stream);
if (sink_stream.info().bytes_in_stream == 0) {
out_region.Unmap();
vTaskDelay(pdMS_TO_TICKS(100));
continue;
}
if (!output_format || output_format != sink_stream.info().format) {
// The format of the stream within the sink stream has changed. We
// need to reconfigure the sink, but shouldn't do so until we've fully
// drained the current buffer.
if (xStreamBufferIsEmpty(sink->buffer())) {
ESP_LOGI(kTag, "reconfiguring dac");
output_format = sink_stream.info().format;
sink->Configure(*output_format);
}
}
// We've reconfigured the sink, or it was already configured correctly.
// Send through some data.
if (output_format == sink_stream.info().format &&
!std::holds_alternative<std::monostate>(*output_format)) {
// TODO: tune the delay on this, as it's currently the only way to
// throttle this task's CPU time. Maybe also hold off on the pipeline
// if the buffer is already close to full?
std::size_t sent = xStreamBufferSend(
sink->buffer(), sink_stream.data().data(),
sink_stream.data().size_bytes(), pdMS_TO_TICKS(10));
if (sent > 0) {
ESP_LOGI(kTag, "sunk %u bytes out of %u (%d %%)", sent,
sink_stream.info().bytes_in_stream,
(int)(((float)sent /
(float)sink_stream.info().bytes_in_stream) *
100));
}
sink_stream.consume(sent);
}
out_region.Unmap();
}
}
}
vTaskDelete(NULL);
}
static std::byte sDrainBuf[8 * 1024];
void AudioDrainMain(void* args) {
{
AudioDrainArgs* real_args = reinterpret_cast<AudioDrainArgs*>(args);
IAudioSink* sink = real_args->sink;
std::atomic<Command>* command = real_args->command;
delete real_args;
// TODO(jacqueline): implement PAUSE without busy-waiting.
while (*command != QUIT) {
std::size_t len = xStreamBufferReceive(sink->buffer(), sDrainBuf,
sizeof(sDrainBuf), portMAX_DELAY);
if (len > 0) {
sink->Send({sDrainBuf, len});
}
}
}
vTaskDelete(NULL);
}
} // namespace task
} // namespace audio
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