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