Speaker support (#4743)

esphome/components/speaker/speaker.h

@@ -0,0 +1,27 @@
+#pragma once
+
+namespace esphome {
+namespace speaker {
+
+enum State : uint8_t {
+  STATE_STOPPED = 0,
+  STATE_STARTING,
+  STATE_RUNNING,
+  STATE_STOPPING,
+};
+
+class Speaker {
+ public:
+  virtual bool play(const uint8_t *data, size_t length) = 0;
+  virtual bool play(const std::vector<uint8_t> &data) { return this->play(data.data(), data.size()); }
+
+  virtual void stop() = 0;
+
+  bool is_running() const { return this->state_ == STATE_RUNNING; }
+
+ protected:
+  State state_{STATE_STOPPED};
+};
+
+}  // namespace speaker
+}  // namespace esphome