关于es8316的音频爆破音的解决

最近在项目中遇到了一个关于播放音频前后，喇叭会产生 哒 的一声,目前没有找到真正原因，但是可以做软件规避。

一、规避思路

对喇叭的功放角进行控制，在使用喇叭之前打开功放角，在使用完喇叭过后关闭功放角，这样就可以规避这种声音的出现。

二、相关代码

frameworks/av/

diff --git a/services/audiopolicy/service/AudioPolicyInterfaceImpl.cpp b/services/audiopolicy/service/AudioPolicyInterfaceImpl.cpp
index dce34db..1b2db64 100644
--- a/services/audiopolicy/service/AudioPolicyInterfaceImpl.cpp
+++ b/services/audiopolicy/service/AudioPolicyInterfaceImpl.cpp
@@ -31,6 +31,12 @@
 #include <media/AudioUtilmtk.h>
 #endif
 
 //这里添加节点路径
+const char *SPEAKER_ENABLE_PATH = "/sys/class/gpio/gpio114/value";
+static bool stream_system_on = false;
+static bool stream_notification_on = false;
+static bool stream_music_on = false;
+static bool stream_other_on = false;
+
 namespace android {
    
 
 
@@ -270,8 +276,33 @@
     sp<AudioPlaybackClient> client;
     sp<AudioPolicyEffects>audioPolicyEffects;
 //打开audio的流程时候使能功放
+    FILE *fp = fopen(SPEAKER_ENABLE_PATH, "w");
+    if (fp != NULL) {
    
+        char buf[2] = "1";
+        if (fwrite(buf, 1, 1, fp))
+            ALOGE("%s() fwrite success", __FUNCTION__);
+        else
+            ALOGE("%s() fwrite fail", __FUNCTION__);
+        fclose(fp);
+    } else
+        ALOGE("+%s() open failed", __FUNCTION__);
+
     getPlaybackClientAndEffects(portId, client, audioPolicyEffects, __func__);
 
+    switch (client->stream) {
    
+        case 1: //AUDIO_STREAM_SYSTEM button sound
+            stream_system_on = true;
+            break;
+        case 3: //AUDIO_STREAM_MUSIC
+            stream_music_on = true;
+            break;
+        case 5://AUDIO_STREAM_NOTIFICATION
+            stream_notification_on = true;
+            break;
+        default:
+            stream_other_on  = true;
+    }
+
     if (audioPolicyEffects != 0) {
    
         // create audio processors according to stream
         status_t status = audioPolicyEffects->addOutputSessionEffects(
@@ -307,6 +338,34 @@
 
     getPlaybackClientAndEffects(portId, client, audioPolicyEffects, __func__);
 
+    switch (client->stream) {
    
+        case 1: //AUDIO_STREAM_SYSTEM button sound
+            stream_system_on = false;
+            break;
+        case 3: //AUDIO_STREAM_MUSIC
+            stream_music_on = false;
+            break;
+        case 5://AUDIO_STREAM_NOTIFICATION
+            stream_notification_on = false;
+            break;
+        default:
+            stream_other_on  = false;
+    }
+ //关闭audio的流程时候关闭功放
+    if ((stream_system_on == false) && (stream_music_on == false) &&
+            (stream_notification_on == false) && (stream_other_on == false)) {
    
+        FILE *fp = fopen(SPEAKER_ENABLE_PATH, "w");
+        if (fp != NULL) {
    
+            char buf[2] = "0";
+            if (fwrite(buf, 1, 1, fp))
+                ALOGE("%s() fwrite success", __FUNCTION__);
+            else
+                ALOGE("%s() fwrite fail", __FUNCTION__);
+            fclose(fp);
+        } else
+            ALOGE("+%s() open failed", __FUNCTION__);
+    }
+
     if (audioPolicyEffects != 0) {
    
         // release audio processors from the stream
         status_t status = audioPolicyEffects->releaseOutputSessionEffects(

device/nxp/
添加对应权限

diff --git a/init.mt8168.rc b/init.mt8168.rc
index 40ef21b..015f327 100644
--- a/init.mt8168.rc
+++ b/init.mt8168.rc
@@ -623,6 +623,10 @@
 # EEPROM
     chmod 0666 /sys/bus/i2c/devices/2-0050/eeprom
 
+# SPEAKER_ENABLE
+    chown system system /sys/class/gpio/gpio114/value
+    chmod 0666 /sys/class/gpio/gpio114/value
+
 on property:vold.decrypt=trigger_reset_main
     write /proc/bootprof "INIT:vold.decrypt=trigger_reset_main"
     setprop sys.boot_completed 0

kernel中将frameworks需要的节点申请出来

diff --git a/drivers/misc/biol_misc.c b/drivers/misc/biol_misc.c
index 6d98a60ed992..a651892d2dda 100644
--- a/drivers/misc/biol_misc.c
+++ b/drivers/misc/biol_misc.c
@@ -122,8 +122,9 @@ static int  sbc_biol_probe(struct platform_device *pdev)
    amp_en = of_get_named_gpio(np,"amp-en", 0);
    if (!gpio_is_valid(amp_en))
    {
    
        return -ENODEV;
    }

    gpio_request(amp_en, "amp-en");
    gpio_direction_output(amp_en, 0);
    //申请节点,后面需要改为1 不然 没有/sys/class/gpio/gpio114/ 的 direction 目录
    gpio_export(amp_en, 1);
    msleep(1);
    gpio_set_value(amp_en, 1);
    msleep(1);

// 对应的dts可以参考我之前写的，只是多了一个添加节点的工具罢了
// https://blog.csdn.net/weixin_51178981/article/details/125097672?spm=1001.2014.3001.5501