feat: Intel BT firmware download, A2dp & Bluetooth audio progress

kernel/src/Drivers/USB/Bluetooth/A2dp.hpp

@@ -26,12 +26,21 @@ namespace Drivers::USB::Bluetooth::A2dp {
     // Public API
     // =========================================================================
 
+    // Drive the A2DP source role after an ACL link is up: open the AVDTP
+    // signaling channel, negotiate an SBC stream, and open the media transport
+    // channel.  Must be called from process context (it blocks on the AVDTP
+    // handshakes), NOT from an event/interrupt path.  Leaves the stream Open.
+    bool StartSource(uint32_t timeoutMs = 5000);
+
     // Called by L2CAP when an AVDTP channel becomes ready
     void OnChannelReady(uint16_t l2capCid);
 
     // Process an AVDTP signaling packet
     void ProcessAvdtp(const uint8_t* data, uint16_t len);
 
+    // Process an SDP response packet (on the SDP L2CAP channel)
+    void ProcessSdp(const uint8_t* data, uint16_t len);
+
     // Configure a stream for the given PCM parameters
     bool ConfigureStream(uint32_t sampleRate, uint8_t channels, uint8_t bitsPerSample);