DivestOS/Patches/LineageOS-14.1/android_system_bt/229574.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: ValdikSS <iam@valdikss.org.ru>
Date: Fri, 21 Sep 2018 13:53:11 +0300
Subject: [PATCH] Increase maximum Bluetooth SBC codec bitrate for SBC HD

This commit increases maximum possible bitrate to 452 kbit/s for 44.1 kHz,
492 kbit/s for 48 kHz, which is optimal for both
EDR 2 mbit/s (4 audio frames, 11.7 ms, 6 wasted bytes) and
EDR 3 mbit/s (6 audio frames, 17.5 ms, 20 wasted bytes).

It does not increase bitpool value and won't introduce higher bitrates for
modes other than SBC Dual Channel.

Test: manual, with various headphones, receivers, and speakers
Change-Id: I5c9dec8848a8017da5b1fc6a5edfbbea5bdcb7eb
---
 btif/src/btif_media_task.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/btif/src/btif_media_task.c b/btif/src/btif_media_task.c
index 977d2668d..cac0c2211 100644
--- a/btif/src/btif_media_task.c
+++ b/btif/src/btif_media_task.c
@@ -208,13 +208,13 @@ enum {
 #endif
 
 #ifdef BTA_AV_SPLIT_A2DP_DEF_FREQ_48KHZ
-#define BTIF_A2DP_DEFAULT_BITRATE 345
+#define BTIF_A2DP_DEFAULT_BITRATE 496
 
 #ifndef BTIF_A2DP_NON_EDR_MAX_RATE
 #define BTIF_A2DP_NON_EDR_MAX_RATE 237
 #endif
 #else
-#define BTIF_A2DP_DEFAULT_BITRATE 328
+#define BTIF_A2DP_DEFAULT_BITRATE 455
 
 #ifndef BTIF_A2DP_NON_EDR_MAX_RATE
 #define BTIF_A2DP_NON_EDR_MAX_RATE 229
@@ -227,8 +227,8 @@ enum {
 #else
 #define A2DP_HDR_SIZE               1
 #endif
-#define MAX_SBC_HQ_FRAME_SIZE_44_1  119
-#define MAX_SBC_HQ_FRAME_SIZE_48    115
+#define MAX_SBC_HQ_FRAME_SIZE_44_1  165
+#define MAX_SBC_HQ_FRAME_SIZE_48    165
 
 /* 2DH5 payload size of 679 bytes - (4 bytes L2CAP Header + 12 bytes AVDTP Header) */
 #define MAX_2MBPS_AVDTP_MTU         663
-- 
2.31.1