From 01be69eca1fa89c047fc29f5cb0ea8ba0898dad1 Mon Sep 17 00:00:00 2001
From: jacqueline <me@jacqueline.id.au>
Date: Wed, 7 Dec 2022 15:36:47 +1100
Subject: better handling of chunk buffer

---
 src/audio/include/audio_playback.hpp | 85 ++++++++----------------------------
 1 file changed, 17 insertions(+), 68 deletions(-)

(limited to 'src/audio/include/audio_playback.hpp')

diff --git a/src/audio/include/audio_playback.hpp b/src/audio/include/audio_playback.hpp
index 41ab46d2..9a7c5fc0 100644
--- a/src/audio/include/audio_playback.hpp
+++ b/src/audio/include/audio_playback.hpp
@@ -3,95 +3,44 @@
 #include <cstdint>
 #include <memory>
 #include <string>
+#include <vector>
 
-#include "audio_common.h"
-#include "audio_element.h"
-#include "audio_event_iface.h"
-#include "audio_pipeline.h"
+#include "audio_element.hpp"
 #include "esp_err.h"
-#include "fatfs_stream.h"
-#include "i2s_stream.h"
-#include "mp3_decoder.h"
+#include "gpio_expander.hpp"
 #include "result.hpp"
-
-#include "audio_output.hpp"
-#include "dac.hpp"
+#include "span.hpp"
 #include "storage.hpp"
+#include "stream_buffer.hpp"
 
-namespace drivers {
+namespace audio {
 
 /*
- * Sends an I2S audio stream to the DAC. Includes basic controls for pausing
- * and resuming the stream, as well as support for gapless playback of the next
- * queued song, but does not implement any kind of sophisticated queing or
- * playback control; these should be handled at a higher level.
+ * TODO.
  */
 class AudioPlayback {
  public:
-  enum Error { FATFS_INIT, I2S_INIT, PIPELINE_INIT };
-  static auto create(std::unique_ptr<IAudioOutput> output)
+  enum Error { ERR_INIT_ELEMENT, ERR_MEM };
+  static auto create(drivers::GpioExpander* expander,
+                     std::shared_ptr<drivers::SdStorage> storage)
       -> cpp::result<std::unique_ptr<AudioPlayback>, Error>;
 
-  AudioPlayback(std::unique_ptr<IAudioOutput>& output,
-                audio_pipeline_handle_t pipeline,
-                audio_element_handle_t source_element,
-                audio_event_iface_handle_t event_interface);
+  // TODO(jacqueline): configure on the fly once we have things to configure.
+  AudioPlayback();
   ~AudioPlayback();
 
-  /*
-   * Replaces any currently playing file with the one given, and begins
-   * playback.
-   *
-   * Any value set in `set_next_file` is cleared by this method.
-   */
   auto Play(const std::string& filename) -> void;
-  /* Toogle between resumed and paused. */
-  auto Toggle() -> void;
-  auto Resume() -> void;
-  auto Pause() -> void;
-
-  enum PlaybackState { PLAYING, PAUSED, STOPPED };
-  auto GetPlaybackState() const -> PlaybackState;
-
-  /*
-   * Handles any pending events from the underlying audio pipeline. This must
-   * be called regularly in order to handle configuring the I2S stream for
-   * different audio types (e.g. sample rate, bit depth), and for gapless
-   * playback.
-   */
-  auto ProcessEvents(uint16_t max_time_ms) -> void;
-
-  /*
-   * Sets the file that should be played immediately after the current file
-   * finishes. This is used for gapless playback
-   */
-  auto SetNextFile(const std::string& filename) -> void;
-
-  auto SetVolume(uint8_t volume) -> void;
-  auto GetVolume() const -> uint8_t;
 
   // Not copyable or movable.
   AudioPlayback(const AudioPlayback&) = delete;
   AudioPlayback& operator=(const AudioPlayback&) = delete;
 
  private:
-  PlaybackState playback_state_;
-
-  enum Decoder { NONE, MP3, AMR, OPUS, OGG, FLAC, WAV, AAC };
-  auto GetDecoderForFilename(std::string filename) const -> Decoder;
-  auto CreateDecoder(Decoder decoder) const -> audio_element_handle_t;
-  auto ReconfigurePipeline(Decoder decoder) -> void;
-
-  std::unique_ptr<IAudioOutput> output_;
-
-  std::string next_filename_ = "";
-
-  audio_pipeline_handle_t pipeline_;
-  audio_element_handle_t source_element_;
-  audio_event_iface_handle_t event_interface_;
+  auto ConnectElements(IAudioElement* src, IAudioElement* sink) -> void;
 
-  audio_element_handle_t decoder_ = nullptr;
-  Decoder decoder_type_ = NONE;
+  StreamBuffer stream_start_;
+  StreamBuffer stream_end_;
+  std::vector<std::unique_ptr<StreamBuffer>> element_buffers_;
 };
 
-}  // namespace drivers
+}  // namespace audio
-- 
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