From acd6d7890051b9253007941733ea37e4011b1b5e Mon Sep 17 00:00:00 2001
From: jacqueline <me@jacqueline.id.au>
Date: Thu, 17 Nov 2022 17:36:37 +1100
Subject: Progress on own pipeline. Still very WIP

---
 src/audio/audio_decoder.cpp | 103 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 103 insertions(+)
 create mode 100644 src/audio/audio_decoder.cpp

(limited to 'src/audio/audio_decoder.cpp')

diff --git a/src/audio/audio_decoder.cpp b/src/audio/audio_decoder.cpp
new file mode 100644
index 00000000..ff9f0d62
--- /dev/null
+++ b/src/audio/audio_decoder.cpp
@@ -0,0 +1,103 @@
+#include "audio_decoder.hpp"
+#include <cstddef>
+#include "esp_heap_caps.h"
+#include "include/audio_element.hpp"
+#include "include/fatfs_audio_input.hpp"
+
+namespace audio {
+
+static const TickType_t kMaxWaitTicks = portMAX_DELAY;
+  // TODO: could this be larger? depends on the codecs i guess
+  static const std::size_t kWorkingBufferSize = kMaxFrameSize;
+
+  AudioDecoder::AudioDecoder() {
+    working_buffer_ = heap_caps_malloc(kWorkingBufferSize, MALLOC_CAP_SPIRAM);
+  }
+
+  AudioDecoder::~AudioDecoder() {
+    free(working_buffer_);
+  }
+
+  auto AudioDecoder::InputCommandQueue() -> QueueHandle_t {
+    return input_queue_;
+  }
+
+  auto AudioDecoder::SetInputCommandQueue(QueueHandle_t queue) -> void {
+    input_queue_ = queue;
+  }
+
+  auto AudioDecoder::SetOutputCommandQueue(QueueHandle_t queue) -> void {
+    output_queue_ = queue;
+  }
+
+  auto AudioDecoder::InputBuffer() -> StreamBufferHandle_t {
+    return input_buffer_;
+  }
+
+  auto AudioDecoder::SetInputBuffer(StreamBufferHandle_t buffer) -> void {
+    input_buffer_ = buffer;
+  }
+
+  auto AudioDecoder::SetOutputBuffer(StreamBufferHandle_t buffer) -> void {
+    output_buffer_ = buffer;
+  }
+
+  auto AudioDecoder::ProcessElementCommand(void* command) -> ProcessResult {
+    FatfsAudioInput::OutputCommand *real = std::reinterpret_cast<FatfsAudioInput::OutputCommand*>(command);
+
+    if (current_codec_->CanHandleExtension(real->extension)) {
+      // TODO: Do we need to reset the codec?
+      delete real;
+      return OK;
+    }
+
+    auto result = codecs::CreateCodecForExtension(real->extension);
+    // TODO: handle error case
+    if (result.has_value()) {
+      current_codec_ = result.value();
+    }
+
+    delete real;
+    return OK;
+  }
+
+  auto AudioDecoder::SkipElementCommand(void* command) -> void {
+    FatfsAudioInput::OutputCommand *real = std::reinterpret_cast<FatfsAudioInput::OutputCommand*>(command);
+    delete real;
+  }
+
+  auto AudioDecoder::ProcessData(uint8_t* data, uint16_t length) -> ProcessResult {
+    if (current_codec_ == nullptr) {
+      // TODO: signal this
+      return OK;
+    }
+
+    auto result = current_codec_->Process(data, length, working_buffer_, kWorkingBufferSize);
+    if (result.has_value()) {
+      xStreamBufferSend(&output_buffer_, working_buffer_, result.value(), kMaxWaitTicks);
+    } else {
+      // TODO: handle i guess
+      return ERROR;
+    }
+
+    return OK;
+  }
+
+  auto AudioDecoder::ProcessIdle() -> ProcessResult {
+    // Not used.
+    return OK;
+  }
+
+  auto AudioDecoder::Pause() -> void {
+    // TODO.
+  }
+  auto AudioDecoder::IsPaused() -> bool {
+    // TODO.
+  }
+
+  auto AudioDecoder::Resume() -> void {
+    // TODO.
+  }
+
+
+} // namespace audio
-- 
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