libaudiohal@aidl: Implement gain change via 'setPortConfig'

The path of updating gain of a port config was not implemented
properly resulting in the update not being sent to the HAL.

Bug: 345852128
Test: atest CoreAudioHalAidlTest
Change-Id: I4ed81a57178fd6f37085c86a0dc98c0c32302f46
diff --git a/media/libaudiohal/impl/Hal2AidlMapper.cpp b/media/libaudiohal/impl/Hal2AidlMapper.cpp
index cbade70..052522f 100644
--- a/media/libaudiohal/impl/Hal2AidlMapper.cpp
+++ b/media/libaudiohal/impl/Hal2AidlMapper.cpp
@@ -37,6 +37,7 @@
 using aidl::android::media::audio::common::AudioDeviceType;
 using aidl::android::media::audio::common::AudioFormatDescription;
 using aidl::android::media::audio::common::AudioFormatType;
+using aidl::android::media::audio::common::AudioGainConfig;
 using aidl::android::media::audio::common::AudioInputFlags;
 using aidl::android::media::audio::common::AudioIoFlags;
 using aidl::android::media::audio::common::AudioOutputFlags;
@@ -325,8 +326,8 @@
 }
 
 status_t Hal2AidlMapper::findOrCreateDevicePortConfig(
-        const AudioDevice& device, const AudioConfig* config, AudioPortConfig* portConfig,
-        bool* created) {
+        const AudioDevice& device, const AudioConfig* config, const AudioGainConfig* gainConfig,
+        AudioPortConfig* portConfig, bool* created) {
     if (auto portConfigIt = findPortConfig(device); portConfigIt == mPortConfigs.end()) {
         auto portsIt = findPort(device);
         if (portsIt == mPorts.end()) {
@@ -339,12 +340,18 @@
         if (config != nullptr) {
             setPortConfigFromConfig(&requestedPortConfig, *config);
         }
+        if (gainConfig != nullptr) {
+            requestedPortConfig.gain = *gainConfig;
+        }
         return createOrUpdatePortConfigRetry(requestedPortConfig, portConfig, created);
     } else {
         AudioPortConfig requestedPortConfig = portConfigIt->second;
         if (config != nullptr) {
             setPortConfigFromConfig(&requestedPortConfig, *config);
         }
+        if (gainConfig != nullptr) {
+            requestedPortConfig.gain = *gainConfig;
+        }
 
         if (requestedPortConfig != portConfigIt->second) {
             return createOrUpdatePortConfigRetry(requestedPortConfig, portConfig, created);
@@ -447,18 +454,26 @@
                 requestedPortConfig.ext.get<Tag::mix>().handle, source, destinationPortIds,
                 portConfig, created);
     } else if (requestedPortConfig.ext.getTag() == Tag::device) {
-        if (const auto& p = requestedPortConfig;
-                p.sampleRate.has_value() && p.channelMask.has_value() &&
-                p.format.has_value()) {
-            AudioConfig config;
-            setConfigFromPortConfig(&config, requestedPortConfig);
+        const auto& p = requestedPortConfig;
+        const bool hasAudioConfig =
+                p.sampleRate.has_value() && p.channelMask.has_value() && p.format.has_value();
+        const bool hasGainConfig = p.gain.has_value();
+        if (hasAudioConfig || hasGainConfig) {
+            AudioConfig config, *configPtr = nullptr;
+            if (hasAudioConfig) {
+                setConfigFromPortConfig(&config, requestedPortConfig);
+                configPtr = &config;
+            }
+            const AudioGainConfig* gainConfigPtr = nullptr;
+            if (hasGainConfig) gainConfigPtr = &(*(p.gain));
             return findOrCreateDevicePortConfig(
-                    requestedPortConfig.ext.get<Tag::device>().device, &config,
+                    requestedPortConfig.ext.get<Tag::device>().device, configPtr, gainConfigPtr,
                     portConfig, created);
         } else {
+            ALOGD("%s: device port config does not have audio or gain config specified", __func__);
             return findOrCreateDevicePortConfig(
                     requestedPortConfig.ext.get<Tag::device>().device, nullptr /*config*/,
-                    portConfig, created);
+                    nullptr /*gainConfig*/, portConfig, created);
         }
     }
     ALOGW("%s: unsupported audio port config: %s",
@@ -769,7 +784,7 @@
     // then find / create a patch between them, and open a stream on the mix port.
     AudioPortConfig devicePortConfig;
     bool created = false;
-    RETURN_STATUS_IF_ERROR(findOrCreateDevicePortConfig(device, config,
+    RETURN_STATUS_IF_ERROR(findOrCreateDevicePortConfig(device, config, nullptr /*gainConfig*/,
                     &devicePortConfig, &created));
     LOG_ALWAYS_FATAL_IF(devicePortConfig.id == 0);
     if (created) {
diff --git a/media/libaudiohal/impl/Hal2AidlMapper.h b/media/libaudiohal/impl/Hal2AidlMapper.h
index c70c8af..710b43e 100644
--- a/media/libaudiohal/impl/Hal2AidlMapper.h
+++ b/media/libaudiohal/impl/Hal2AidlMapper.h
@@ -163,6 +163,7 @@
     status_t findOrCreateDevicePortConfig(
             const ::aidl::android::media::audio::common::AudioDevice& device,
             const ::aidl::android::media::audio::common::AudioConfig* config,
+            const ::aidl::android::media::audio::common::AudioGainConfig* gainConfig,
             ::aidl::android::media::audio::common::AudioPortConfig* portConfig,
             bool* created);
     // If the resulting 'portConfig->id' is 0, that means the config was not created,