Merge branch 'bugfix/btdm_a2dp_src_pkt_overflow' into 'master'

component/bt: fix some performance issues in A2DP source data flow control

See merge request idf/esp-idf!4932

components/bt/bluedroid/btc/profile/std/a2dp/btc_a2dp_source.c

@@ -1155,10 +1155,16 @@ static UINT8 btc_get_num_aa_frame(void)
 
         /* calculate nbr of frames pending for this media tick */
         result = btc_aa_src_cb.media_feeding_state.pcm.counter / pcm_bytes_per_frame;
-        if (result > MAX_PCM_FRAME_NUM_PER_TICK) {
-            APPL_TRACE_WARNING("%s() - Limiting frames to be sent from %d to %d"
-                               , __FUNCTION__, result, MAX_PCM_FRAME_NUM_PER_TICK);
-            result = MAX_PCM_FRAME_NUM_PER_TICK;
+
+        /* limit the frames to be sent */
+        UINT32 frm_nb_threshold = MAX_OUTPUT_A2DP_SRC_FRAME_QUEUE_SZ - fixed_queue_length(btc_aa_src_cb.TxAaQ);
+        if (frm_nb_threshold > MAX_PCM_FRAME_NUM_PER_TICK) {
+            frm_nb_threshold = MAX_PCM_FRAME_NUM_PER_TICK;
+        }
+
+        if (result > frm_nb_threshold) {
+            APPL_TRACE_EVENT("Limit frms to send from %d to %d", result, frm_nb_threshold);
+            result = frm_nb_threshold;
         }
         btc_aa_src_cb.media_feeding_state.pcm.counter -= result * pcm_bytes_per_frame;
 

components/bt/bluedroid/osi/include/osi/thread.h

@@ -95,7 +95,7 @@ typedef enum {
 #define BTC_A2DP_SOURCE_TASK_STACK_SIZE       (CONFIG_BT_A2DP_SOURCE_TASK_STACK_SIZE + BT_TASK_EXTRA_STACK_SIZE) // by menuconfig
 #define BTC_A2DP_SOURCE_TASK_NAME             "BtA2dSourceT"
 #define BTC_A2DP_SOURCE_TASK_PRIO             (configMAX_PRIORITIES - 3)
-#define BTC_A2DP_SOURCE_DATA_QUEUE_LEN        (3)
+#define BTC_A2DP_SOURCE_DATA_QUEUE_LEN        (1)
 #define BTC_A2DP_SOURCE_CTRL_QUEUE_LEN        (5)
 #define BTC_A2DP_SOURCE_TASK_QUEUE_SET_LEN    (BTC_A2DP_SOURCE_DATA_QUEUE_LEN + BTC_A2DP_SOURCE_CTRL_QUEUE_LEN)