1 files changed, 0 insertions, 201 deletions
diff --git a/src/audio/sink_mixer.cpp b/src/audio/sink_mixer.cpp
deleted file mode 100644
index ad7198dc..00000000
--- a/src/audio/sink_mixer.cpp
+++ /dev/null
@@ -1,201 +0,0 @@
-/*
- * Copyright 2023 jacqueline <me@jacqueline.id.au>
- *
- * SPDX-License-Identifier: GPL-3.0-only
- */
-
-#include "sink_mixer.hpp"
-
-#include <algorithm>
-#include <cmath>
-#include <cstdint>
-
-#include "audio_sink.hpp"
-#include "esp_heap_caps.h"
-#include "esp_log.h"
-#include "freertos/portmacro.h"
-#include "freertos/projdefs.h"
-#include "idf_additions.h"
-
-#include "resample.hpp"
-#include "sample.hpp"
-#include "tasks.hpp"
-
-static constexpr char kTag[] = "mixer";
-
-static constexpr std::size_t kSourceBufferLength = 8 * 1024;
-static constexpr std::size_t kSampleBufferLength = 240 * 2;
-
-namespace audio {
-
-SinkMixer::SinkMixer()
-    : commands_(xQueueCreate(1, sizeof(Args))),
-      resampler_(nullptr),
-      source_(xStreamBufferCreateWithCaps(kSourceBufferLength,
-                                          1,
-                                          MALLOC_CAP_SPIRAM)) {
-  input_buffer_ = {
-      reinterpret_cast<sample::Sample*>(heap_caps_calloc(
-          kSampleBufferLength, sizeof(sample::Sample), MALLOC_CAP_SPIRAM)),
-      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_SPIRAM)),
-      kSampleBufferLength};
-
-  tasks::StartPersistent<tasks::Type::kMixer>([&]() { Main(); });
-}
-
-SinkMixer::~SinkMixer() {
-  vQueueDelete(commands_);
-  vStreamBufferDelete(source_);
-}
-
-auto SinkMixer::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 SinkMixer::MixAndSend(cpp::span<sample::Sample> input,
-                           const IAudioOutput::Format& format,
-                           bool is_eos) -> void {
-  Args args{
-      .format = format,
-      .samples_available = input.size(),
-      .is_end_of_stream = is_eos,
-  };
-  xQueueSend(commands_, &args, portMAX_DELAY);
-
-  cpp::span<std::byte> input_as_bytes = {
-      reinterpret_cast<std::byte*>(input.data()), input.size_bytes()};
-  size_t bytes_sent = 0;
-  while (bytes_sent < input_as_bytes.size()) {
-    bytes_sent +=
-        xStreamBufferSend(source_, input_as_bytes.subspan(bytes_sent).data(),
-                          input_as_bytes.size() - bytes_sent, portMAX_DELAY);
-  }
-}
-
-auto SinkMixer::Main() -> void {
-  for (;;) {
-    Args args;
-    while (!xQueueReceive(commands_, &args, portMAX_DELAY)) {
-    }
-    if (args.format != source_format_) {
-      resampler_.reset();
-      source_format_ = args.format;
-      leftover_bytes_ = 0;
-      leftover_offset_ = 0;
-
-      auto new_target = sink_->PrepareFormat(args.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;
-    }
-
-    // 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 = args.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_offset_ + leftover_bytes_)
-              .data(),
-          std::min(input_buffer_as_bytes_.size() - leftover_offset_ -
-                       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_.subspan(leftover_offset_).first(samples_in_buffer),
-          args.is_end_of_stream && bytes_read == bytes_to_read);
-
-      // 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.
-      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) {
-        leftover_offset_ = 0;
-      } else {
-        leftover_offset_ += bytes_used;
-      }
-    }
-  }
-}
-
-auto SinkMixer::HandleSamples(cpp::span<sample::Sample> input, bool is_eos)
-    -> size_t {
-  if (source_format_ == target_format_) {
-    // The happiest possible case: the input format matches the output
-    // format already.
-    std::size_t bytes_sent = xStreamBufferSend(
-        sink_->stream(), input.data(), input.size_bytes(), portMAX_DELAY);
-    return bytes_sent / sizeof(sample::Sample);
-  }
-
-  size_t samples_used = 0;
-  while (samples_used < input.size()) {
-    cpp::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_, is_eos);
-      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();
-    }
-
-    size_t bytes_sent = 0;
-    size_t bytes_to_send = output_source.size_bytes();
-    while (bytes_sent < bytes_to_send) {
-      bytes_sent += xStreamBufferSend(
-          sink_->stream(),
-          reinterpret_cast<std::byte*>(output_source.data()) + bytes_sent,
-          bytes_to_send - bytes_sent, portMAX_DELAY);
-    }
-  }
-  return samples_used;
-}
-
-}  // namespace audio