DivestOS/Patches/LineageOS-15.1/android_system_bt/0001-Improve_Quality.patch

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From 133e43eb4f5339e584dc2dcc3f02a34711c93571 Mon Sep 17 00:00:00 2001
From: Tad <tad@spotco.us>
Date: Thu, 23 Aug 2018 22:16:42 -0400
Subject: [PATCH] Improve Bluetooth audio quality, credit @ValdikSS
Change-Id: I98f5b84982aaf446e5adfb622993ee11f4592f64
See: https://forum.xda-developers.com/android/software-hacking/improve-bluetooth-audio-quality-t3832615
---
stack/a2dp/a2dp_sbc.cc | 14 +++++++-------
stack/a2dp/a2dp_sbc_encoder.cc | 2 +-
2 files changed, 8 insertions(+), 8 deletions(-)
diff --git a/stack/a2dp/a2dp_sbc.cc b/stack/a2dp/a2dp_sbc.cc
index cfdaad4c..1416d4c3 100644
--- a/stack/a2dp/a2dp_sbc.cc
+++ b/stack/a2dp/a2dp_sbc.cc
@@ -55,7 +55,7 @@ typedef struct {
/* SBC SRC codec capabilities */
static const tA2DP_SBC_CIE a2dp_sbc_caps = {
A2DP_SBC_IE_SAMP_FREQ_44, /* samp_freq */
- (A2DP_SBC_IE_CH_MD_MONO | A2DP_SBC_IE_CH_MD_JOINT), /* ch_mode */
+ (A2DP_SBC_IE_CH_MD_MONO | A2DP_SBC_IE_CH_MD_JOINT | A2DP_SBC_IE_CH_MD_DUAL), /* ch_mode */
(A2DP_SBC_IE_BLOCKS_16 | A2DP_SBC_IE_BLOCKS_12 | A2DP_SBC_IE_BLOCKS_8 |
A2DP_SBC_IE_BLOCKS_4), /* block_len */
A2DP_SBC_IE_SUBBAND_8, /* num_subbands */
@@ -82,7 +82,7 @@ static const tA2DP_SBC_CIE a2dp_sbc_sink_caps = {
/* Default SBC codec configuration */
const tA2DP_SBC_CIE a2dp_sbc_default_config = {
A2DP_SBC_IE_SAMP_FREQ_44, /* samp_freq */
- A2DP_SBC_IE_CH_MD_JOINT, /* ch_mode */
+ A2DP_SBC_IE_CH_MD_DUAL, /* ch_mode */
A2DP_SBC_IE_BLOCKS_16, /* block_len */
A2DP_SBC_IE_SUBBAND_8, /* num_subbands */
A2DP_SBC_IE_ALLOC_MD_L, /* alloc_method */
@@ -1154,6 +1154,11 @@ static bool select_audio_bits_per_sample(
//
static bool select_best_channel_mode(uint8_t ch_mode, tA2DP_SBC_CIE* p_result,
btav_a2dp_codec_config_t* p_codec_config) {
+ if (ch_mode & A2DP_SBC_IE_CH_MD_DUAL) {
+ p_result->ch_mode = A2DP_SBC_IE_CH_MD_DUAL;
+ p_codec_config->channel_mode = BTAV_A2DP_CODEC_CHANNEL_MODE_STEREO;
+ return true;
+ }
if (ch_mode & A2DP_SBC_IE_CH_MD_JOINT) {
p_result->ch_mode = A2DP_SBC_IE_CH_MD_JOINT;
p_codec_config->channel_mode = BTAV_A2DP_CODEC_CHANNEL_MODE_STEREO;
@@ -1164,11 +1169,6 @@ static bool select_best_channel_mode(uint8_t ch_mode, tA2DP_SBC_CIE* p_result,
p_codec_config->channel_mode = BTAV_A2DP_CODEC_CHANNEL_MODE_STEREO;
return true;
}
- if (ch_mode & A2DP_SBC_IE_CH_MD_DUAL) {
- p_result->ch_mode = A2DP_SBC_IE_CH_MD_DUAL;
- p_codec_config->channel_mode = BTAV_A2DP_CODEC_CHANNEL_MODE_STEREO;
- return true;
- }
if (ch_mode & A2DP_SBC_IE_CH_MD_MONO) {
p_result->ch_mode = A2DP_SBC_IE_CH_MD_MONO;
p_codec_config->channel_mode = BTAV_A2DP_CODEC_CHANNEL_MODE_MONO;
diff --git a/stack/a2dp/a2dp_sbc_encoder.cc b/stack/a2dp/a2dp_sbc_encoder.cc
index e4c20499..8b3731d1 100644
--- a/stack/a2dp/a2dp_sbc_encoder.cc
+++ b/stack/a2dp/a2dp_sbc_encoder.cc
@@ -39,7 +39,7 @@
#define A2DP_SBC_ENCODER_INTERVAL_MS 20
/* High quality quality setting @ 44.1 khz */
-#define A2DP_SBC_DEFAULT_BITRATE 328
+#define A2DP_SBC_DEFAULT_BITRATE 512
#define A2DP_SBC_NON_EDR_MAX_RATE 229
--
2.18.0