Evolution-x/hardware_interfaces
1
0
Fork 0
mirror of https://github.com/Evolution-X/hardware_interfaces synced 2026-02-01 05:49:27 +00:00
Code Issues Packages Projects Releases Wiki Activity

BluetoothAudio: Refine the FMQ size for A2DP software encoding

Browse Source 
For those high-resolution codecs, they are 24 or 32 bits per sample, so
the buffer size must be the LCM of 16, 24, and 32.

Bug: 194980528
Test: A2DP playing with aptX and / or LDAC
Change-Id: I788e185496dea4a1b40fa369e032a4f8491b835b
This commit is contained in:
Cheney Ni
2021-07-29 00:50:03 +08:00
parent e06046e2d0
commit a0cc24730e
2 changed files with 12 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
bluetooth/audio/2.0/default/A2dpSoftwareAudioProvider.cpp
View File

@@ -32,10 +32,14 @@ namespace implementation {
using ::android::bluetooth::audio::BluetoothAudioSessionReport;
using ::android::hardware::Void;
// Here the buffer size is based on SBC
static constexpr uint32_t kPcmFrameSize = 4; // 16 bits per sample / stereo
static constexpr uint32_t kPcmFrameCount = 128;
// SBC is 128, and here choose the LCM of 16, 24, and 32
static constexpr uint32_t kPcmFrameCount = 96;
static constexpr uint32_t kRtpFrameSize = kPcmFrameSize * kPcmFrameCount;
static constexpr uint32_t kRtpFrameCount = 7; // max counts by 1 tick (20ms)
// The max counts by 1 tick (20ms) for SBC is about 7. Since using 96 for the
// PCM counts, here we just choose a greater number
static constexpr uint32_t kRtpFrameCount = 10;
static constexpr uint32_t kBufferSize = kRtpFrameSize * kRtpFrameCount;
static constexpr uint32_t kBufferCount = 2; // double buffer
static constexpr uint32_t kDataMqSize = kBufferSize * kBufferCount;

8
bluetooth/audio/2.1/default/A2dpSoftwareAudioProvider.cpp
View File

@@ -34,10 +34,14 @@ using ::android::bluetooth::audio::BluetoothAudioSessionReport_2_1;
using ::android::hardware::Void;
using ::android::hardware::bluetooth::audio::V2_0::AudioConfiguration;
// Here the buffer size is based on SBC
static constexpr uint32_t kPcmFrameSize = 4; // 16 bits per sample / stereo
static constexpr uint32_t kPcmFrameCount = 128;
// SBC is 128, and here we choose the LCM of 16, 24, and 32
static constexpr uint32_t kPcmFrameCount = 96;
static constexpr uint32_t kRtpFrameSize = kPcmFrameSize * kPcmFrameCount;
static constexpr uint32_t kRtpFrameCount = 7; // max counts by 1 tick (20ms)
// The max counts by 1 tick (20ms) for SBC is about 7. Since using 96 for the
// PCM counts, here we just choose a greater number
static constexpr uint32_t kRtpFrameCount = 10;
static constexpr uint32_t kBufferSize = kRtpFrameSize * kRtpFrameCount;
static constexpr uint32_t kBufferCount = 2; // double buffer
static constexpr uint32_t kDataMqSize = kBufferSize * kBufferCount;