From 6f3ae29a9d8be05b812cbfde5b04c15d9356bf4d Mon Sep 17 00:00:00 2001
From: Hongwei Wang <hwwang@google.com>
Date: Tue, 29 May 2018 13:11:45 -0700
Subject: Demonstrates master mute implementation in car emulator

Bug: 80474559
Test: adb shell input keyevent 164
Change-Id: I75710257050d97ee1e6d637ee6fef0efecb9e39f
---
 emulator/audio/driver/audio_hw.c | 33 +++++++++++++++++++++++++--------
 emulator/audio/driver/audio_hw.h |  1 +
 2 files changed, 26 insertions(+), 8 deletions(-)

(limited to 'emulator')

diff --git a/emulator/audio/driver/audio_hw.c b/emulator/audio/driver/audio_hw.c
index c2eff7e..807cc15 100644
--- a/emulator/audio/driver/audio_hw.c
+++ b/emulator/audio/driver/audio_hw.c
@@ -50,6 +50,8 @@
 #define IN_PERIOD_MS 15
 #define IN_PERIOD_COUNT 4
 
+#define _bool_str(x) ((x)?"true":"false")
+
 static int adev_get_mic_mute(const struct audio_hw_device *dev, bool *state);
 
 static struct pcm_config pcm_config_out = {
@@ -264,7 +266,7 @@ static void *out_write_worker(void *args) {
             ALOGE("pcm_write failed %s address %s", ext_pcm_get_error(ext_pcm), out->bus_address);
             restart = true;
         } else {
-            ALOGD("pcm_write succeed address %s", out->bus_address);
+            ALOGV("pcm_write succeed address %s", out->bus_address);
         }
     }
     if (buffer) {
@@ -347,9 +349,14 @@ static ssize_t out_write(struct audio_stream_out *stream, const void *buffer, si
         out->frames_total_buffered = 0;
     }
 
-    out_apply_gain(out, buffer, bytes);
-    size_t frames_written = audio_vbuffer_write(&out->buffer, buffer, frames);
-    pthread_cond_signal(&out->worker_wake);
+    size_t frames_written = frames;
+    if (out->dev->master_mute) {
+        ALOGV("%s: ignored due to master mute", __func__);
+    } else {
+        out_apply_gain(out, buffer, bytes);
+        frames_written = audio_vbuffer_write(&out->buffer, buffer, frames);
+        pthread_cond_signal(&out->worker_wake);
+    }
 
     /* Implementation just consumes bytes if we start getting backed up */
     out->frames_written += frames;
@@ -1049,11 +1056,21 @@ static int adev_get_master_volume(struct audio_hw_device *dev, float *volume) {
 }
 
 static int adev_set_master_mute(struct audio_hw_device *dev, bool muted) {
-    return -ENOSYS;
+    ALOGD("%s: %s", __func__, _bool_str(muted));
+    struct generic_audio_device *adev = (struct generic_audio_device *)dev;
+    pthread_mutex_lock(&adev->lock);
+    adev->master_mute = muted;
+    pthread_mutex_unlock(&adev->lock);
+    return 0;
 }
 
 static int adev_get_master_mute(struct audio_hw_device *dev, bool *muted) {
-    return -ENOSYS;
+    struct generic_audio_device *adev = (struct generic_audio_device *)dev;
+    pthread_mutex_lock(&adev->lock);
+    *muted = adev->master_mute;
+    pthread_mutex_unlock(&adev->lock);
+    ALOGD("%s: %s", __func__, _bool_str(*muted));
+    return 0;
 }
 
 static int adev_set_mode(struct audio_hw_device *dev, audio_mode_t mode) {
@@ -1326,8 +1343,8 @@ static int adev_open(const hw_module_t *module,
     adev->device.set_voice_volume = adev_set_voice_volume;   // no op
     adev->device.set_master_volume = adev_set_master_volume; // no op
     adev->device.get_master_volume = adev_get_master_volume; // no op
-    adev->device.set_master_mute = adev_set_master_mute;     // no op
-    adev->device.get_master_mute = adev_get_master_mute;     // no op
+    adev->device.set_master_mute = adev_set_master_mute;
+    adev->device.get_master_mute = adev_get_master_mute;
     adev->device.set_mode = adev_set_mode;                   // no op
     adev->device.set_mic_mute = adev_set_mic_mute;
     adev->device.get_mic_mute = adev_get_mic_mute;
diff --git a/emulator/audio/driver/audio_hw.h b/emulator/audio/driver/audio_hw.h
index 9ad7990..41217ad 100644
--- a/emulator/audio/driver/audio_hw.h
+++ b/emulator/audio/driver/audio_hw.h
@@ -28,6 +28,7 @@
 struct generic_audio_device {
   struct audio_hw_device device;  // Constant after init
   pthread_mutex_t lock;
+  bool master_mute;             // Proteced by this->lock
   bool mic_mute;                // Proteced by this->lock
   struct mixer *mixer;          // Proteced by this->lock
   Hashmap *out_bus_stream_map;  // Extended field. Constant after init
-- 
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