tangara-fw/src/audio/include/audio_sink.hpp

#pragma once

#include <stdint.h>
#include "audio_element.hpp"
#include "esp_heap_caps.h"
#include "freertos/FreeRTOS.h"
#include "stream_info.hpp"
namespace audio {

class IAudioSink {
 private:
  // TODO: tune. at least about 12KiB seems right for mp3
  static const std::size_t kDrainBufferSize = 24 * 1024;
  uint8_t *buffer_;
  StaticStreamBuffer_t *metadata_;
  StreamBufferHandle_t *handle_;

 public:
  IAudioSink() :
    buffer_(reinterpret_cast<uint8_t*>(heap_caps_malloc(kDrainBufferSize, MALLOC_CAP_DMA))),
    metadata_(reinterpret_cast<StaticStreamBuffer_t*>(heap_caps_malloc(sizeof(StaticStreamBuffer_t), MALLOC_CAP_DMA))),
    handle_(reinterpret_cast<StreamBufferHandle_t*>(heap_caps_malloc(sizeof(StreamBufferHandle_t), MALLOC_CAP_DMA))) {
      *handle_ = xStreamBufferCreateStatic(kDrainBufferSize, 1, buffer_, metadata_);
    }

  virtual ~IAudioSink() {
    vStreamBufferDelete(*handle_);
    free(buffer_);
    free(handle_);
    free(metadata_);
  }

  virtual auto Configure(const StreamInfo::Format& format) -> bool = 0;
  virtual auto Send(const cpp::span<std::byte>& data) -> void = 0;
  virtual auto Log() -> void {}

  auto buffer() -> StreamBufferHandle_t* { return handle_; }
};

}  // namespace audio