audioflinger: add HOTWORD audio source.

HOTWORD is a special capture audio source that uses
the same audio tuning as VOICE_RECOGNITION but allows an
active capture to be preempted.

Bug: 10640877.

Change-Id: Iea09a11cbcdbacc8d434e5230e7559dcd1b44ac0

1 files changed, 10 insertions, 2 deletions

diff --git a/services/audioflinger/AudioPolicyService.cpp b/services/audioflinger/AudioPolicyService.cpp
index 900b411..4be292f 100644
--- a/services/audioflinger/AudioPolicyService.cpp
+++ b/services/audioflinger/AudioPolicyService.cpp
@@ -296,9 +296,14 @@ audio_io_handle_t AudioPolicyService::getInput(audio_source_t inputSource,
         return 0;
     }
     // already checked by client, but double-check in case the client wrapper is bypassed
-    if (uint32_t(inputSource) >= AUDIO_SOURCE_CNT) {
+    if (inputSource >= AUDIO_SOURCE_CNT && inputSource != AUDIO_SOURCE_HOTWORD) {
         return 0;
     }
+
+    if ((inputSource == AUDIO_SOURCE_HOTWORD) && !captureHotwordAllowed()) {
+        return 0;
+    }
+
     Mutex::Autolock _l(mLock);
     // the audio_in_acoustics_t parameter is ignored by get_input()
     audio_io_handle_t input = mpAudioPolicy->get_input(mpAudioPolicy, inputSource, samplingRate,
@@ -308,7 +313,10 @@ audio_io_handle_t AudioPolicyService::getInput(audio_source_t inputSource,
         return input;
     }
     // create audio pre processors according to input source
-    ssize_t index = mInputSources.indexOfKey(inputSource);
+    audio_source_t aliasSource = (inputSource == AUDIO_SOURCE_HOTWORD) ?
+                                    AUDIO_SOURCE_VOICE_RECOGNITION : inputSource;
+
+    ssize_t index = mInputSources.indexOfKey(aliasSource);
     if (index < 0) {
         return input;
     }