DivestOS/Patches/LineageOS-17.1/android_system_bt/272650.patch

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: ValdikSS <iam@valdikss.org.ru>
Date: Thu, 13 Sep 2018 23:14:10 +0300
Subject: [PATCH] Allow using alternative (higher) SBC HD bitrates with a
property
Change-Id: Ic85e5c8a8c70233de2125e69c01d74e5501a2da8
---
stack/a2dp/a2dp_sbc_encoder.cc | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
diff --git a/stack/a2dp/a2dp_sbc_encoder.cc b/stack/a2dp/a2dp_sbc_encoder.cc
index d80f1b680..5cf1ac104 100644
--- a/stack/a2dp/a2dp_sbc_encoder.cc
+++ b/stack/a2dp/a2dp_sbc_encoder.cc
@@ -32,6 +32,7 @@
#include "embdrv/sbc/encoder/include/sbc_encoder.h"
#include "osi/include/log.h"
#include "osi/include/osi.h"
+#include "osi/include/properties.h"
/* Buffer pool */
#define A2DP_SBC_BUFFER_SIZE BT_DEFAULT_BUFFER_SIZE
@@ -54,6 +55,17 @@
#define A2DP_SBC_3DH5_DEFAULT_BITRATE 552
#define A2DP_SBC_3DH5_48KHZ_BITRATE 601
+/*
+ * SBC Dual Channel (SBC HD) 2DH5 alternative bitrates.
+ * 648 kbps @ 48 khz, 595.4 kbps @ 44.1 khz.
+ * Up to 3 frames for 2DH5.
+ */
+#define A2DP_SBC_2DH5_ALT_BITRATE 596
+#define A2DP_SBC_2DH5_ALT_48KHZ_BITRATE 649
+
+// SBC HD alternative bitrate property
+#define A2DP_SBC_HD_PROP "persist.bluetooth.sbc_hd_higher_bitrate"
+
#define A2DP_SBC_NON_EDR_MAX_RATE 229
/*
@@ -853,6 +865,7 @@ static uint16_t a2dp_sbc_source_rate() {
if (a2dp_sbc_encoder_cb.sbc_encoder_params.s16SamplingFreq == SBC_sf48000)
rate = A2DP_SBC_48KHZ_BITRATE;
+ /* 3DH5 maximum bitrates */
if (a2dp_sbc_encoder_cb.peer_supports_3mbps &&
a2dp_sbc_encoder_cb.TxAaMtuSize >= MIN_3MBPS_AVDTP_SAFE_MTU) {
rate = A2DP_SBC_3DH5_DEFAULT_BITRATE;
@@ -860,6 +873,14 @@ static uint16_t a2dp_sbc_source_rate() {
rate = A2DP_SBC_3DH5_48KHZ_BITRATE;
}
+ /* 2DH5 alternative bitrates */
+ if (!a2dp_sbc_encoder_cb.peer_supports_3mbps &&
+ osi_property_get_int32(A2DP_SBC_HD_PROP, 0)) {
+ rate = A2DP_SBC_2DH5_ALT_BITRATE;
+ if (a2dp_sbc_encoder_cb.sbc_encoder_params.s16SamplingFreq == SBC_sf48000)
+ rate = A2DP_SBC_2DH5_ALT_48KHZ_BITRATE;
+ }
+
/* restrict bitrate if a2dp link is non-edr */
if (!a2dp_sbc_encoder_cb.is_peer_edr) {
rate = A2DP_SBC_NON_EDR_MAX_RATE;