Commit 33575cb9 authored Jun 04, 2015 by Andy Hung

Change Nexus 5 and Nexus 6 deep buffer to 2 periods of 1920 frames(40ms)

Prior setting of 8 periods of 960 frames had identical
thread processing interval to the normal mixer thread.
By increasing the thread processing interval, there is
a measured power reduction of 10 percent on MSM8994.

Note: as a consequence, operations such as pause or volume
may have a slightly greater granularity (40 ms vs 20 ms).

Bug: 21198655
Change-Id: Icd8ce12c987d2b89578c2d2ad9a2ded54c6ce4c0

parent 8c8d0cf4

hal/msm8974/platform.h

+5 −2

Original line number	Diff line number	Diff line
		@@ -156,8 +156,11 @@ enum {
		* We should take care of returning proper size when AudioFlinger queries for
		* the buffer size of an input/output stream
		*/
		#define DEEP_BUFFER_OUTPUT_PERIOD_SIZE 960
		#define DEEP_BUFFER_OUTPUT_PERIOD_COUNT 8

		/* 1920 frames(40ms) at 2 buffers gives a good tradeoff between power and latency */
		#define DEEP_BUFFER_OUTPUT_PERIOD_SIZE 1920
		#define DEEP_BUFFER_OUTPUT_PERIOD_COUNT 2

		#define LOW_LATENCY_OUTPUT_PERIOD_SIZE 240
		#define LOW_LATENCY_OUTPUT_PERIOD_COUNT 2