commit 08c7e31b610125739922f02fdeb9399f617f9264
author Mingming Yin <mingming@codeaurora.org> Mon Mar 16 18:10:58 2015 -0700
committer Mingming Yin <mingming@codeaurora.org> Mon Mar 16 18:10:58 2015 -0700
tree becb48347ece0c32e3f8238498f89747c382c577
parent 52f8653ddbaf7da6daeb4bf2d1cfa61bdcc25f8e

hal: add support to use low lantecy as primay output

- Add support to use low lantency output as primary
  output when AUDIO_USE_LL_AS_PRIMARY_OUTPUT is enabled

Change-Id: Ie7faf9f7af4c97b7afdda8084b7acf162abbc0b6

hal/Android.mk

diff --git a/hal/Android.mk b/hal/Android.mk
index 05d3e82..c67f390 100644
--- a/hal/Android.mk
+++ b/hal/Android.mk
@@ -56,6 +56,10 @@
     LOCAL_SRC_FILES += edid.c
 endif
 
+ifeq ($(strip $(AUDIO_USE_LL_AS_PRIMARY_OUTPUT)),true)
+    LOCAL_CFLAGS += -DUSE_LL_AS_PRIMARY_OUTPUT
+endif
+
 ifeq ($(strip $(AUDIO_FEATURE_ENABLED_PCM_OFFLOAD)),true)
     LOCAL_CFLAGS += -DPCM_OFFLOAD_ENABLED
 endif

hal/audio_hw.c

diff --git a/hal/audio_hw.c b/hal/audio_hw.c
index 96f252c..607258d 100644
--- a/hal/audio_hw.c
+++ b/hal/audio_hw.c
@@ -81,7 +81,13 @@
 #define PROXY_OPEN_RETRY_COUNT           100
 #define PROXY_OPEN_WAIT_TIME             20
 
+#ifdef USE_LL_AS_PRIMARY_OUTPUT
+#define USECASE_AUDIO_PLAYBACK_PRIMARY USECASE_AUDIO_PLAYBACK_LOW_LATENCY
+#define PCM_CONFIG_AUDIO_PLAYBACK_PRIMARY pcm_config_low_latency
+#else
 #define USECASE_AUDIO_PLAYBACK_PRIMARY USECASE_AUDIO_PLAYBACK_DEEP_BUFFER
+#define PCM_CONFIG_AUDIO_PLAYBACK_PRIMARY pcm_config_deep_buffer
+#endif
 
 static unsigned int configured_low_latency_capture_period_size =
         LOW_LATENCY_CAPTURE_PERIOD_SIZE;
@@ -2940,11 +2946,16 @@
         out->usecase = USECASE_AUDIO_PLAYBACK_LOW_LATENCY;
         out->config = pcm_config_low_latency;
         out->sample_rate = out->config.rate;
+    } else if (out->flags & AUDIO_OUTPUT_FLAG_DEEP_BUFFER) {
+        format = AUDIO_FORMAT_PCM_16_BIT;
+        out->usecase = USECASE_AUDIO_PLAYBACK_DEEP_BUFFER;
+        out->config = pcm_config_deep_buffer;
+        out->sample_rate = out->config.rate;
     } else {
         /* primary path is the default path selected if no other outputs are available/suitable */
         format = AUDIO_FORMAT_PCM_16_BIT;
         out->usecase = USECASE_AUDIO_PLAYBACK_PRIMARY;
-        out->config = pcm_config_deep_buffer;
+        out->config = PCM_CONFIG_AUDIO_PLAYBACK_PRIMARY;
         out->sample_rate = out->config.rate;
     }