Count samples going in and out of the drain buffer

This is a more accurate way of knowing which track is playing when, and
also simplifies a lot of fragile logic in audio_fsm

2 files changed, 5 insertions, 2 deletions

diff --git a/src/drivers/include/drivers/bluetooth.hpp b/src/drivers/include/drivers/bluetooth.hpp
index 5960de7e..ad61fcc1 100644
--- a/src/drivers/include/drivers/bluetooth.hpp
+++ b/src/drivers/include/drivers/bluetooth.hpp
@@ -13,10 +13,10 @@
 #include <freertos/stream_buffer.h>
 #include <stdint.h>
 #include "drivers/bluetooth_types.hpp"
+#include "drivers/nvs.hpp"
 #include "esp_a2dp_api.h"
 #include "esp_avrc_api.h"
 #include "esp_gap_bt_api.h"
-#include "drivers/nvs.hpp"
 #include "tasks.hpp"
 #include "tinyfsm.hpp"
 #include "tinyfsm/include/tinyfsm.hpp"
@@ -44,6 +44,7 @@ class Bluetooth {
 
   auto SetSource(StreamBufferHandle_t) -> void;
   auto SetVolumeFactor(float) -> void;
+  auto SamplesUsed() -> uint32_t;
 
   auto SetEventHandler(std::function<void(bluetooth::Event)> cb) -> void;
 };
diff --git a/src/drivers/include/drivers/i2s_dac.hpp b/src/drivers/include/drivers/i2s_dac.hpp
index 5e81f875..0776dbab 100644
--- a/src/drivers/include/drivers/i2s_dac.hpp
+++ b/src/drivers/include/drivers/i2s_dac.hpp
@@ -11,8 +11,8 @@
 #include <functional>
 #include <memory>
 #include <optional>
-#include <utility>
 #include <span>
+#include <utility>
 
 #include "driver/i2s_std.h"
 #include "driver/i2s_types.h"
@@ -71,6 +71,8 @@ class I2SDac {
   auto WriteData(const std::span<const std::byte>& data) -> void;
   auto SetSource(StreamBufferHandle_t buffer) -> void;
 
+  auto SamplesUsed() -> uint32_t;
+
   // Not copyable or movable.
   I2SDac(const I2SDac&) = delete;
   I2SDac& operator=(const I2SDac&) = delete;