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