1 files changed, 0 insertions, 265 deletions
diff --git a/src/audio/audio_converter.cpp b/src/audio/audio_converter.cpp
deleted file mode 100644
index d2edb0b3..00000000
--- a/src/audio/audio_converter.cpp
+++ /dev/null
@@ -1,265 +0,0 @@
-/*
- * Copyright 2023 jacqueline <me@jacqueline.id.au>
- *
- * SPDX-License-Identifier: GPL-3.0-only
- */
-
-#include "audio_converter.hpp"
-#include <stdint.h>
-
-#include <algorithm>
-#include <cmath>
-#include <cstdint>
-
-#include "audio_events.hpp"
-#include "audio_sink.hpp"
-#include "esp_heap_caps.h"
-#include "esp_log.h"
-#include "event_queue.hpp"
-#include "freertos/portmacro.h"
-#include "freertos/projdefs.h"
-#include "i2s_dac.hpp"
-
-#include "resample.hpp"
-#include "sample.hpp"
-#include "tasks.hpp"
-
-[[maybe_unused]] static constexpr char kTag[] = "mixer";
-
-static constexpr std::size_t kSampleBufferLength =
-    drivers::kI2SBufferLengthFrames * sizeof(sample::Sample) * 2;
-static constexpr std::size_t kSourceBufferLength = kSampleBufferLength * 2;
-
-namespace audio {
-
-SampleConverter::SampleConverter()
-    : commands_(xQueueCreate(1, sizeof(Args))),
-      resampler_(nullptr),
-      source_(xStreamBufferCreateWithCaps(kSourceBufferLength,
-                                          sizeof(sample::Sample) * 2,
-                                          MALLOC_CAP_DMA)),
-      leftover_bytes_(0),
-      samples_sunk_(0) {
-  input_buffer_ = {
-      reinterpret_cast<sample::Sample*>(heap_caps_calloc(
-          kSampleBufferLength, sizeof(sample::Sample), MALLOC_CAP_DMA)),
-      kSampleBufferLength};
-  input_buffer_as_bytes_ = {reinterpret_cast<std::byte*>(input_buffer_.data()),
-                            input_buffer_.size_bytes()};
-
-  resampled_buffer_ = {
-      reinterpret_cast<sample::Sample*>(heap_caps_calloc(
-          kSampleBufferLength, sizeof(sample::Sample), MALLOC_CAP_DMA)),
-      kSampleBufferLength};
-
-  tasks::StartPersistent<tasks::Type::kAudioConverter>([&]() { Main(); });
-}
-
-SampleConverter::~SampleConverter() {
-  vQueueDelete(commands_);
-  vStreamBufferDelete(source_);
-}
-
-auto SampleConverter::SetOutput(std::shared_ptr<IAudioOutput> output) -> void {
-  // FIXME: We should add synchronisation here, but we should be careful about
-  // not impacting performance given that the output will change only very
-  // rarely (if ever).
-  sink_ = output;
-}
-
-auto SampleConverter::beginStream(std::shared_ptr<TrackInfo> track) -> void {
-  Args args{
-      .track = new std::shared_ptr<TrackInfo>(track),
-      .samples_available = 0,
-      .is_end_of_stream = false,
-  };
-  xQueueSend(commands_, &args, portMAX_DELAY);
-}
-
-auto SampleConverter::continueStream(std::span<sample::Sample> input) -> void {
-  Args args{
-      .track = nullptr,
-      .samples_available = input.size(),
-      .is_end_of_stream = false,
-  };
-  xQueueSend(commands_, &args, portMAX_DELAY);
-  xStreamBufferSend(source_, input.data(), input.size_bytes(), portMAX_DELAY);
-}
-
-auto SampleConverter::endStream() -> void {
-  Args args{
-      .track = nullptr,
-      .samples_available = 0,
-      .is_end_of_stream = true,
-  };
-  xQueueSend(commands_, &args, portMAX_DELAY);
-}
-
-auto SampleConverter::Main() -> void {
-  for (;;) {
-    Args args;
-    while (!xQueueReceive(commands_, &args, portMAX_DELAY)) {
-    }
-
-    if (args.track) {
-      handleBeginStream(*args.track);
-      delete args.track;
-    }
-    if (args.samples_available) {
-      handleContinueStream(args.samples_available);
-    }
-    if (args.is_end_of_stream) {
-      handleEndStream();
-    }
-  }
-}
-
-auto SampleConverter::handleBeginStream(std::shared_ptr<TrackInfo> track)
-    -> void {
-  if (track->format != source_format_) {
-    resampler_.reset();
-    source_format_ = track->format;
-    leftover_bytes_ = 0;
-
-    auto new_target = sink_->PrepareFormat(track->format);
-    if (new_target != target_format_) {
-      // The new format is different to the old one. Wait for the sink to
-      // drain before continuing.
-      while (!xStreamBufferIsEmpty(sink_->stream())) {
-        ESP_LOGI(kTag, "waiting for sink stream to drain...");
-        // TODO(jacqueline): Get the sink drain ISR to notify us of this
-        // via semaphore instead of busy-ish waiting.
-        vTaskDelay(pdMS_TO_TICKS(10));
-      }
-
-      sink_->Configure(new_target);
-    }
-    target_format_ = new_target;
-  }
-
-  samples_sunk_ = 0;
-  events::Audio().Dispatch(internal::StreamStarted{
-      .track = track,
-      .src_format = source_format_,
-      .dst_format = target_format_,
-  });
-}
-
-auto SampleConverter::handleContinueStream(size_t samples_available) -> void {
-  // Loop until we finish reading all the bytes indicated. There might be
-  // leftovers from each iteration, and from this process as a whole,
-  // depending on the resampling stage.
-  size_t bytes_read = 0;
-  size_t bytes_to_read = samples_available * sizeof(sample::Sample);
-  while (bytes_read < bytes_to_read) {
-    // First top up the input buffer, taking care not to overwrite anything
-    // remaining from a previous iteration.
-    size_t bytes_read_this_it = xStreamBufferReceive(
-        source_, input_buffer_as_bytes_.subspan(leftover_bytes_).data(),
-        std::min(input_buffer_as_bytes_.size() - leftover_bytes_,
-                 bytes_to_read - bytes_read),
-        portMAX_DELAY);
-    bytes_read += bytes_read_this_it;
-
-    // Calculate the number of whole samples that are now in the input buffer.
-    size_t bytes_in_buffer = bytes_read_this_it + leftover_bytes_;
-    size_t samples_in_buffer = bytes_in_buffer / sizeof(sample::Sample);
-
-    size_t samples_used = handleSamples(input_buffer_.first(samples_in_buffer));
-
-    // Maybe the resampler didn't consume everything. Maybe the last few
-    // bytes we read were half a frame. Either way, we need to calculate the
-    // size of the remainder in bytes, then move it to the front of our
-    // buffer.
-    size_t bytes_used = samples_used * sizeof(sample::Sample);
-    assert(bytes_used <= bytes_in_buffer);
-
-    leftover_bytes_ = bytes_in_buffer - bytes_used;
-    if (leftover_bytes_ > 0) {
-      std::memmove(input_buffer_as_bytes_.data(),
-                   input_buffer_as_bytes_.data() + bytes_used, leftover_bytes_);
-    }
-  }
-}
-
-auto SampleConverter::handleSamples(std::span<sample::Sample> input) -> size_t {
-  if (source_format_ == target_format_) {
-    // The happiest possible case: the input format matches the output
-    // format already.
-    sendToSink(input);
-    return input.size();
-  }
-
-  size_t samples_used = 0;
-  while (samples_used < input.size()) {
-    std::span<sample::Sample> output_source;
-    if (source_format_.sample_rate != target_format_.sample_rate) {
-      if (resampler_ == nullptr) {
-        ESP_LOGI(kTag, "creating new resampler for %lu -> %lu",
-                 source_format_.sample_rate, target_format_.sample_rate);
-        resampler_.reset(new Resampler(source_format_.sample_rate,
-                                       target_format_.sample_rate,
-                                       source_format_.num_channels));
-      }
-
-      size_t read, written;
-      std::tie(read, written) = resampler_->Process(input.subspan(samples_used),
-                                                    resampled_buffer_, false);
-      samples_used += read;
-
-      if (read == 0 && written == 0) {
-        // Zero samples used or written. We need more input.
-        break;
-      }
-      output_source = resampled_buffer_.first(written);
-    } else {
-      output_source = input;
-      samples_used = input.size();
-    }
-
-    sendToSink(output_source);
-  }
-
-  return samples_used;
-}
-
-auto SampleConverter::handleEndStream() -> void {
-  if (resampler_) {
-    size_t read, written;
-    std::tie(read, written) = resampler_->Process({}, resampled_buffer_, true);
-
-    if (written > 0) {
-      sendToSink(resampled_buffer_.first(written));
-    }
-  }
-
-  // Send a final update to finish off this stream's samples.
-  if (samples_sunk_ > 0) {
-    events::Audio().Dispatch(internal::StreamUpdate{
-        .samples_sunk = samples_sunk_,
-    });
-    samples_sunk_ = 0;
-  }
-  leftover_bytes_ = 0;
-
-  events::Audio().Dispatch(internal::StreamEnded{});
-}
-
-auto SampleConverter::sendToSink(std::span<sample::Sample> samples) -> void {
-  // Update the number of samples sunk so far *before* actually sinking them,
-  // since writing to the stream buffer will block when the buffer gets full.
-  samples_sunk_ += samples.size();
-  if (samples_sunk_ >=
-      target_format_.sample_rate * target_format_.num_channels) {
-    events::Audio().Dispatch(internal::StreamUpdate{
-        .samples_sunk = samples_sunk_,
-    });
-    samples_sunk_ = 0;
-  }
-
-  xStreamBufferSend(sink_->stream(),
-                    reinterpret_cast<std::byte*>(samples.data()),
-                    samples.size_bytes(), portMAX_DELAY);
-}
-
-}  // namespace audio