Fix for audio distortion on speaker (a7bed17a) · Commits · e / os / android_hardware_qcom_audio

post_proc/volume_listener.c

+13 −5

Original line number	Diff line number	Diff line
		@@ -18,6 +18,7 @@
		//#define LOG_NDEBUG 0
		#include <stdlib.h>
		#include <dlfcn.h>
		#include <math.h>

		#include <cutils/list.h>
		#include <cutils/log.h>
		@@ -229,7 +230,7 @@ static void check_and_set_gain_dep_cal()
		{
		// iterate through list and make decision to set new gain dep cal level for speaker device
		// 1. find all usecase active on speaker
		// 2. find average of left and right for each usecase
		// 2. find energy sum for each usecase
		// 3. find the highest of all the active usecase
		// 4. if new value is different than the current value then load new calibration

		@@ -243,15 +244,22 @@ static void check_and_set_gain_dep_cal()

		ALOGV("%s ==> Start ...", __func__);

		// select the highest volume on speaker device
		float sum_energy = 0.0;
		bool sum_energy_used = false;
		float temp_vol = 0;
		// compute energy sum for the active speaker device (pick loudest of both channels)
		list_for_each(node, &vol_effect_list) {
		context = node_to_item(node, struct vol_listener_context_s, effect_list_node);
		if ((context->state == VOL_LISTENER_STATE_ACTIVE) &&
		(context->dev_id & AUDIO_DEVICE_OUT_SPEAKER) &&
		(new_vol < (context->left_vol + context->right_vol) / 2)) {
		new_vol = (context->left_vol + context->right_vol) / 2;
		(context->dev_id & AUDIO_DEVICE_OUT_SPEAKER)) {
		sum_energy_used = true;
		temp_vol = fmax(context->left_vol, context->right_vol);
		sum_energy += temp_vol * temp_vol;
		}
		}
		if (sum_energy_used) {
		new_vol = fmin(sqrt(sum_energy), 1.0);
		}

		if (new_vol != current_vol) {
		ALOGV("%s:: Change in decision :: current volume is %f new volume is %f",