Webrtc回声消除调试pc环境

一概述

该测试环境通过将开发板模拟成一个单通道播放、三声道录音的UAC声卡设备，当开发板与PC连接时，可以在PC上通过应用工具（普通播放器、音频处理软件等）控制开发板的icodec播放、录音及回环，并且能够实时地观察到基于回声消除算法库（Webrtc）处理后的回声消除效果.

二配置

2.1 回声消除相关demo

代码文件位置libmedia/test/main_webrtc_uac_noecho_test.c

2.2 播放、录⾳与回读功能

声卡驱动配置

默认勾选加载模块时codec进入待机状态，播放时配置dac余下步骤（避免播放无声或滋滋声）

使能ADCL中MIC输入为单端模式： ad100 mic为差分不用勾选，ad102n/p为单端需要勾选

mic信号的增益(MICL_GAIN)：外接amic时需要依据信号强弱设置改增益⼤⼩

⼿动设置ALCL增益(ALCL_GAIN)：alcl为codec的adc的数字增益，⽤于调节录制⾳频的增益⼤⼩

输出信号的模拟增益(HPOUTL)：⽤于调节播放⾳频的增益⼤⼩

录音时mic引脚需高电平，播放时功放引脚需高电平

创建声卡设备

2.3 buildroot配置

bhu@bhu-PC:~/ad100/buildroot/buildroot24$ make menuconfig

编译webrtc库需要工具链gcc1210

2.4 kernel uac 配置

bhu@bhu-PC:~/ad100/kernel/kernel$ make menuconfig

关闭USB的描述符DMA

2.5 uac2.0设备配置脚本

uac2_device_config.sh位于目录doc/开发使用说明/第三方库使用说明/硬件回环回声消除测试环境

#!/bin/bash

VID="0x18d1"
PID="0xd002"

function start_uac2()
{
    echo "Creating the USB gadget..."
    mount -t configfs none /sys/kernel/config

    mkdir -m 0770 /sys/kernel/config/usb_gadget/g1

    # 设置产品的VendorID、ProductID及USB规范版本号
    echo "Setting Device Descriptor..."
    echo 0x00 > /sys/kernel/config/usb_gadget/g1/bDeviceClass
    echo 0x00 > /sys/kernel/config/usb_gadget/g1/bDeviceSubClass
    echo 0x00 > /sys/kernel/config/usb_gadget/g1/bDeviceProtocol
    echo 0x0200 > /sys/kernel/config/usb_gadget/g1/bcdUSB
    echo 0x0200 > /sys/kernel/config/usb_gadget/g1/bcdDevice
    echo $VID > /sys/kernel/config/usb_gadget/g1/idVendor
    echo $PID > /sys/kernel/config/usb_gadget/g1/idProduct

    # 实例化英语ID，开发商、产品和序列号字符串写入内核
    echo "Setting English strings..."
    mkdir -m 0770 /sys/kernel/config/usb_gadget/g1/strings/0x409
    echo "ingenic"  > /sys/kernel/config/usb_gadget/g1/strings/0x409/manufacturer
    echo "audio"  > /sys/kernel/config/usb_gadget/g1/strings/0x409/product
    echo "your_serial_num" > /sys/kernel/config/usb_gadget/g1/strings/0x409/serialnumber

    # Creating Config
    echo "Creating Config..."
    mkdir -m 0770 /sys/kernel/config/usb_gadget/g1/configs/c.1
    mkdir -m 0770 /sys/kernel/config/usb_gadget/g1/configs/c.1/strings/0x409
    echo "uac2" > /sys/kernel/config/usb_gadget/g1/configs/c.1/strings/0x409/configuration
    echo 500 > /sys/kernel/config/usb_gadget/g1/configs/c.1/MaxPower
    echo 0x80 > /sys/kernel/config/usb_gadget/g1/configs/c.1/bmAttributes

     
    # Creating functions
    echo "Creating functions..."
    mkdir /sys/kernel/config/usb_gadget/g1/functions/uac2.0
    echo "0x01" > /sys/kernel/config/usb_gadget/g1/functions/uac2.0/c_chmask
    echo "2" > /sys/kernel/config/usb_gadget/g1/functions/uac2.0/c_ssize
    echo $SAMPLE_RATE > /sys/kernel/config/usb_gadget/g1/functions/uac2.0/c_srate
    echo "0x07" > /sys/kernel/config/usb_gadget/g1/functions/uac2.0/p_chmask
    echo "2" > /sys/kernel/config/usb_gadget/g1/functions/uac2.0/p_ssize
    echo $SAMPLE_RATE > /sys/kernel/config/usb_gadget/g1/functions/uac2.0/p_srate
    echo "2" > /sys/kernel/config/usb_gadget/g1/functions/uac2.0/req_number
    echo "adaptive" > /sys/kernel/config/usb_gadget/g1/functions/uac2.0/c_sync

    # Binding USB Device Controller
    echo "Binding USB Device Controller"
    ln -s /sys/kernel/config/usb_gadget/g1/functions/uac2.0 /sys/kernel/config/usb_gadget/g1/configs/c.1
    echo 13500000.otg > /sys/kernel/config/usb_gadget/g1/UDC
}

function stop_uac2()
{
    # Disabling the gadget
    echo "Disabling the USB gadget"
    echo "" > /sys/kernel/config/usb_gadget/g1/UDC

    # Remove functions from configurations
    rm /sys/kernel/config/usb_gadget/g1/configs/c.1/uac2.0
    # Remove strings directories in configurations
    rmdir /sys/kernel/config/usb_gadget/g1/configs/c.1/strings/0x409
    # remove the configurations
    rmdir /sys/kernel/config/usb_gadget/g1/configs/c.1
    # Remove functions (function modules are not unloaded, though)
    rmdir /sys/kernel/config/usb_gadget/g1/functions/uac2.0
    # Remove strings directories in the gadget
    rmdir /sys/kernel/config/usb_gadget/g1/strings/0x409
    # finally remove the gadget
    rmdir /sys/kernel/config/usb_gadget/g1

    umount /sys/kernel/config
}

usage()
{
    echo "Usage: ./usb-gadget-uac2.sh start|stop"
    echo " options:"
    echo "   start [sample_rate]   uac2.0 gadget, setting rate of both capture and playback"
    echo "   stop                  uac2.0 gadget"
}

case $1 in
start)
    if [ "$#" -lt 2 ]; then
        usage
        exit 1
    fi

    SAMPLE_RATE=$2
    start_uac2
    ;;
stop)
    stop_uac2
    ;;
*)
    usage
    exit 1
    ;;
esac
exit 0

三验证

3.1 模拟uac设备

在终端运行uac设备脚本

sh uac2_device_config.sh start 48000               //48000为采样率

3.2 修改回声消除测试demo

代码文件位置libmedia/test/main_webrtc_uac_noecho_test.c

# arecord -l
**** List of CAPTURE Hardware Devices ****
card 0: icodecsoundcard [icodec-sound-card], device 0: ad100-icodec-pcm ingenic-icodec-0 []
  Subdevices: 0/1
  Subdevice #0: subdevice #0
card 1: loopbacksoundca [loopback-sound-card], device 0: ad100-loopback-pcm snd-soc-dummy-dai-0 []
  Subdevices: 0/1
  Subdevice #0: subdevice #0
card 2: UAC2Gadget [UAC2_Gadget], device 0: UAC2 PCM [UAC2 PCM]
  Subdevices: 0/1
  Subdevice #0: subdevice #0

icodecsoundcard为card 0，loopbacksoundcard为card 1，UAC2Gadget为card 2；

修改完后重新编译测试demo

3.3 运行测试demo

aec_webrtc_uac_loopback_test 48000        //48000为采样率

此处的采样率与uac设备配置脚本的采样率需要保持一致，变更时需要同时变更

3.4 pc端调试

Audacity配置

运行应用Audacity，选择录制设备为模拟UAC设备，录制声道数为3，采样率相应设置为48000Hz

设置完开始录制，打开任意音频文件选择该模拟UAC设备播放，测试回声消除效果

由上到下，

第一行为回声消除后的音频数据，

第二行为实际录制到的音频数据，

第三行为回采到的音频数据（即模拟UAC设备播放的音频文件）

四调试

可以通过 cmd_alsa(libhardware2中的⼯具)修改mic及speak音量大小

# cmd_alsa list_ctls card=hw:0
integer: "Master Playback Volume" [0, 255] 220      //speak大小
integer: "Mic Volume" [0, 255] 225                  //mic大小
integer: "ADCL Volume" [0, 255] 225
other[1]: "Playback Mute"
integer: "AGC OBSERVE Gain" [0, 31] 31
integer: "AGC PGAIN MAX Volume" [0, 7] 7
integer: "AGC PGAIN MIN Volume" [0, 7] 0
integer: "AGC RANGE MAX Threshold" [0, 32767] 16422
integer: "AGC RANGE MIN Threshold" [0, 32767] 8294
other[1]: "AGC Switch"
integer: "ALCL Volume" [0, 31] 6
integer: "DACL Volume" [0, 255] 220
integer: "HPOUTL Volume" [0, 4] 0
integer: "MICL Volume" [0, 3] 3

 example:
   cmd_alsa set_ctl card=hw:0 ctl="Master Playback Volume" value=230

Webrtc回声消除调试pc环境

一 概述​

二 配置​

2.1 回声消除相关demo​

2.2 播放、录⾳与回读功能​

2.3 buildroot配置​

2.4 kernel uac 配置​

2.5 uac2.0设备配置脚本​

三 验证​

3.1 模拟uac设备​

3.2 修改回声消除测试demo​

3.3 运行测试demo​

3.4 pc端调试​

四 调试​

一概述

二配置