Diff: wave_player.cpp

Revision:

2:87acbc2d0023

Parent:

0:62c18ade9a60

diff -r acc3e18e77ad -r 87acbc2d0023 wave_player.cpp
--- a/wave_player.cpp	Tue Jan 18 03:57:27 2011 +0000
+++ b/wave_player.cpp	Mon Nov 21 21:13:54 2016 +0000
@@ -14,8 +14,7 @@
 #include <mbed.h>
 #include <stdio.h>
 #include <wave_player.h>
-
-
+int g_volume = 0;
 //-----------------------------------------------------------------------------
 // constructor -- accepts an mbed pin to use for AnalogOut.  Only p18 will work
 wave_player::wave_player(AnalogOut *_dac)
@@ -44,7 +43,7 @@
 // SDcard filesystem can be hotrodded by increasing the SPI frequency it uses
 // internally.
 //-----------------------------------------------------------------------------
-void wave_player::play(FILE *wavefile)
+void wave_player::play(FILE *wavefile, int *startStop, int *volume)
 {
         unsigned chunk_id,chunk_size,channel;
         unsigned data,samp_int,i;
@@ -56,6 +55,7 @@
         int *data_wptr;
         FMT_STRUCT wav_format;
         long slice,num_slices;
+        
   DAC_wptr=0;
   DAC_rptr=0;
   for (i=0;i<256;i+=2) {
@@ -134,6 +134,13 @@
             printf("Oops -- not enough slices in the wave file\n");
             exit(1);
           }
+          //exit when user stops song
+           if (*startStop == 0){
+                break;
+            }
+            //pass volume to dac_out
+            g_volume = *volume;
+            
           data_sptr=(short *)slice_buf;     // 16 bit samples
           data_bptr=(unsigned char *)slice_buf;     // 8 bit samples
           data_wptr=(int *)slice_buf;     // 32 bit samples
@@ -194,6 +201,7 @@
     }
     fread(&chunk_id,4,1,wavefile);
     fread(&chunk_size,4,1,wavefile);
+
   }
 }
 
@@ -204,7 +212,8 @@
 #ifdef VERBOSE
   printf("ISR rdptr %d got %u\n",DAC_rptr,DAC_fifo[DAC_rptr]);
 #endif
-    wave_DAC->write_u16(DAC_fifo[DAC_rptr]);
+
+    wave_DAC->write_u16((DAC_fifo[DAC_rptr]*(16 - g_volume))>>4);
     DAC_rptr=(DAC_rptr+1) & 0xff;
   }
 }