diff --git a/ap/lib/libtinyalsa/tinyalsa_voice_ref.c b/ap/lib/libtinyalsa/tinyalsa_voice_ref.c
new file mode 100644
index 0000000..3e4923b
--- /dev/null
+++ b/ap/lib/libtinyalsa/tinyalsa_voice_ref.c
@@ -0,0 +1,122 @@
+/*
+ *
+ * Based on 7510_dev.c
+ *
+ */
+
+#include <tinyalsa/audio_mixer_ctrl.h>
+
+
+struct pcm  *voicePcmOut = NULL;
+struct pcm  *voicePcmIn = NULL;
+
+typedef struct
+{
+    // uint32_t voice_mode;//0, 2/3g;1, volte nb;2 ,volte wb;
+    uint32_t clock_rate; //8000, 2/3g;8000, volte nb;16000 ,volte wb;
+    uint32_t channel_count;
+    uint32_t samples_per_frame;//160, 2/3g;160, volte nb;320 ,volte wb;
+    uint32_t bits_per_sample;
+} T_voiceCfg;
+
+T_voiceCfg cfgParam = {0,8000,1,160,16};
+
+
+
+   
+ int voice_PreOpen(T_voiceCfg *cfgParam)
+{
+	struct mixer *voice_mixer = NULL;
+ 	struct pcm_config config_voice = {0};
+
+ 	/* open mixer dev for codec control */
+	voice_mixer = mixer_open(0);
+	if(!voice_mixer)
+	{
+		printf("zte voice_mixer open failed!");
+		goto err_ret;
+	}
+
+	/* config mixer dev */
+   	mix_set_voice_path(voice_mixer, T_OUTPUT_SPEAKER); 
+   	mix_set_voice_vol(voice_mixer, T_VOICE_VOL_3_LEVEL);
+
+    /*close mixer */
+    mixer_close(voice_mixer);
+    voice_mixer = NULL;
+
+    /* open pcm dev for data tranf*/
+    config_voice.channels = cfgParam->channel_count;
+    config_voice.rate = cfgParam->clock_rate;
+    /* buffer num */
+    config_voice.period_count = 3;
+    /* buffer size */
+    config_voice.period_size = cfgParam->samples_per_frame *  cfgParam->bits_per_sample / 8; 
+    /* 16-bit signed */
+    config_voice.format = PCM_FORMAT_S16_LE; 
+	
+	//card 0 dev 1
+	//23G card 0 dev 2
+	voicePcmOut = pcm_open(0, 1, PCM_OUT, &config_voice);
+	if(!voicePcmOut || !pcm_is_ready(voicePcmOut))
+	{
+		printf( "zte voicePcmOut open failed!");	
+		goto err_ret;
+	}
+	
+	voicePcmIn = pcm_open(0, 1, PCM_IN, &config_voice);
+	if(!voicePcmIn || !pcm_is_ready(voicePcmIn))
+	{
+		printf( "zte voicePcmIn open failed!");
+		goto err_ret;
+	}
+	
+    if(0 != pcm_prepare(voicePcmOut)) 
+	{
+		printf("zte voicePcmOut pcm_prepare failed!");
+		goto err_ret;
+	}
+		
+    if(0 != pcm_prepare(voicePcmIn)) 
+	{
+		printf("zte voicePcmIn pcm_prepare failed!");
+		goto err_ret;
+	}
+	return 0;
+err_ret:
+	if(voice_mixer)
+	{
+		mixer_close(voice_mixer);
+    	voice_mixer = NULL;
+	}
+
+	if(voicePcmOut)
+	{
+		pcm_close(voicePcmOut);
+    	voicePcmOut = NULL;
+	}
+	if(voicePcmIn)
+	{
+		pcm_close(voicePcmIn);
+    	voicePcmIn = NULL;
+	}
+	return -1;
+	
+}
+
+
+ void voice_PreClose(void)
+{
+	if(voicePcmOut)
+	{
+		pcm_close(voicePcmOut);
+    	voicePcmOut = NULL;
+	}
+	if(voicePcmIn)
+	{
+		pcm_close(voicePcmIn);
+    	voicePcmIn = NULL;
+	}
+}
+
+