Revision 2:1a9dbc4d2b46, committed 2014-02-02

Comitter:

aos

Date:

Sun Feb 02 10:48:11 2014 +0000

Parent:

1:acc3e18e77ad

Commit message:

Modified for adjusting volume

Changed in this revision

--- a/wave_player.cpp	Tue Jan 18 03:57:27 2011 +0000
+++ b/wave_player.cpp	Sun Feb 02 10:48:11 2014 +0000
@@ -1,21 +1,10 @@
-//-----------------------------------------------------------------------------
-// a sample mbed library to play back wave files.
-//
-// explanation of wave file format.
-// https://ccrma.stanford.edu/courses/422/projects/WaveFormat/
 
-// if VERBOSE is uncommented then the wave player will enter a verbose
-// mode that displays all data values as it reads them from the file
-// and writes them to the DAC.  Very slow and unusable output on the DAC,
-// but useful for debugging wave files that don't work.
-//#define VERBOSE
-
-
+ 
 #include <mbed.h>
 #include <stdio.h>
 #include <wave_player.h>
-
-
+ 
+Serial pc(USBTX, USBRX);
 //-----------------------------------------------------------------------------
 // constructor -- accepts an mbed pin to use for AnalogOut.  Only p18 will work
 wave_player::wave_player(AnalogOut *_dac)
@@ -24,7 +13,7 @@
   wave_DAC->write_u16(32768);        //DAC is 0-3.3V, so idles at ~1.6V
   verbosity=0;
 }
-
+ 
 //-----------------------------------------------------------------------------
 // if verbosity is set then wave player enters a mode where the wave file
 // is decoded and displayed to the screen, including sample values put into
@@ -36,7 +25,7 @@
 {
   verbosity=v;
 }
-
+ 
 //-----------------------------------------------------------------------------
 // player function.  Takes a pointer to an opened wave file.  The file needs
 // to be stored in a filesystem with enough bandwidth to feed the wave data.
@@ -64,60 +53,62 @@
   }
   DAC_wptr=4;
   DAC_on=0;
-
+ 
   fread(&chunk_id,4,1,wavefile);
   fread(&chunk_size,4,1,wavefile);
   while (!feof(wavefile)) {
     if (verbosity)
-      printf("Read chunk ID 0x%x, size 0x%x\n",chunk_id,chunk_size);
+      pc.printf("Read chunk ID 0x%x, size 0x%x\n",chunk_id,chunk_size);
     switch (chunk_id) {
       case 0x46464952:
         fread(&data,4,1,wavefile);
         if (verbosity) {
-          printf("RIFF chunk\n");
-          printf("  chunk size %d (0x%x)\n",chunk_size,chunk_size);
-          printf("  RIFF type 0x%x\n",data);
+          pc.printf("RIFF chunk\n");
+          pc.printf("  chunk size %d (0x%x)\n",chunk_size,chunk_size);
+          pc.printf("  RIFF type 0x%x\n",data);
         }
+        pc.printf("case1\n");
         break;
       case 0x20746d66:
         fread(&wav_format,sizeof(wav_format),1,wavefile);
         if (verbosity) {
-          printf("FORMAT chunk\n");
-          printf("  chunk size %d (0x%x)\n",chunk_size,chunk_size);
-          printf("  compression code %d\n",wav_format.comp_code);
-          printf("  %d channels\n",wav_format.num_channels);
-          printf("  %d samples/sec\n",wav_format.sample_rate);
-          printf("  %d bytes/sec\n",wav_format.avg_Bps);
-          printf("  block align %d\n",wav_format.block_align);
-          printf("  %d bits per sample\n",wav_format.sig_bps);
+          pc.printf("FORMAT chunk\n");
+          pc.printf("  chunk size %d (0x%x)\n",chunk_size,chunk_size);
+          pc.printf("  compression code %d\n",wav_format.comp_code);
+          pc.printf("  %d channels\n",wav_format.num_channels);
+          pc.printf("  %d samples/sec\n",wav_format.sample_rate);
+          pc.printf("  %d bytes/sec\n",wav_format.avg_Bps);
+          pc.printf("  block align %d\n",wav_format.block_align);
+          pc.printf("  %d bits per sample\n",wav_format.sig_bps);
         }
         if (chunk_size > sizeof(wav_format))
           fseek(wavefile,chunk_size-sizeof(wav_format),SEEK_CUR);
+         pc.printf("case2\n");
         break;
       case 0x61746164:
 // allocate a buffer big enough to hold a slice
         slice_buf=(char *)malloc(wav_format.block_align);
         if (!slice_buf) {
-          printf("Unable to malloc slice buffer");
+          pc.printf("Unable to malloc slice buffer");
           exit(1);
         }
         num_slices=chunk_size/wav_format.block_align;
         samp_int=1000000/(wav_format.sample_rate);
         if (verbosity) {
-          printf("DATA chunk\n");
-          printf("  chunk size %d (0x%x)\n",chunk_size,chunk_size);
-          printf("  %d slices\n",num_slices);
-          printf("  Ideal sample interval=%d\n",(unsigned)(1000000.0/wav_format.sample_rate));
-          printf("  programmed interrupt tick interval=%d\n",samp_int);
+          pc.printf("DATA chunk\n");
+          pc.printf("  chunk size %d (0x%x)\n",chunk_size,chunk_size);
+          pc.printf("  %d slices\n",num_slices);
+          pc.printf("  Ideal sample interval=%d\n",(unsigned)(1000000.0/wav_format.sample_rate));
+          pc.printf("  programmed interrupt tick interval=%d\n",samp_int);
         }
-
+ 
 // starting up ticker to write samples out -- no printfs until tick.detach is called
         if (verbosity)
           tick.attach_us(this,&wave_player::dac_out, 500000); 
         else
           tick.attach_us(this,&wave_player::dac_out, samp_int); 
         DAC_on=1; 
-
+ 
 // start reading slices, which contain one sample each for however many channels
 // are in the wave file.  one channel=mono, two channels=stereo, etc.  Since
 // mbed only has a single AnalogOut, all of the channels present are averaged
@@ -131,7 +122,7 @@
         for (slice=0;slice<num_slices;slice+=1) {
           fread(slice_buf,wav_format.block_align,1,wavefile);
           if (feof(wavefile)) {
-            printf("Oops -- not enough slices in the wave file\n");
+            pc.printf("Oops -- not enough slices in the wave file\n");
             exit(1);
           }
           data_sptr=(short *)slice_buf;     // 16 bit samples
@@ -139,20 +130,21 @@
           data_wptr=(int *)slice_buf;     // 32 bit samples
           slice_value=0;
           for (channel=0;channel<wav_format.num_channels;channel++) {
+            
             switch (wav_format.sig_bps) {
               case 16:
                 if (verbosity)
-                  printf("16 bit channel %d data=%d ",channel,data_sptr[channel]);
+                  pc.printf("16 bit channel %d data=%d ",channel,data_sptr[channel]);
                 slice_value+=data_sptr[channel];
                 break;
               case 32:
                 if (verbosity)
-                  printf("32 bit channel %d data=%d ",channel,data_wptr[channel]);
+                  pc.printf("32 bit channel %d data=%d ",channel,data_wptr[channel]);
                 slice_value+=data_wptr[channel];
                 break;
               case 8:
                 if (verbosity)
-                  printf("8 bit channel %d data=%d ",channel,(int)data_bptr[channel]);
+                  pc.printf("8 bit channel %d data=%d ",channel,(int)data_bptr[channel]);
                 slice_value+=data_bptr[channel];
                 break;
             }
@@ -172,8 +164,10 @@
           }
           dac_data=(short unsigned)slice_value;
           if (verbosity)
-            printf("sample %d wptr %d slice_value %d dac_data %u\n",slice,DAC_wptr,(int)slice_value,dac_data);
-          DAC_fifo[DAC_wptr]=dac_data;
+            pc.printf("sample %d wptr %d slice_value %d dac_data %u\n",slice,DAC_wptr,(int)slice_value,dac_data);
+          DAC_fifo[DAC_wptr]=dac_data*volume; //--> modified: adjusting the volume
+          
+          //controls end     
           DAC_wptr=(DAC_wptr+1) & 0xff;
           while (DAC_wptr==DAC_rptr) {
           }
@@ -181,14 +175,16 @@
         DAC_on=0;
         tick.detach();
         free(slice_buf);
+         pc.printf("case3\n");
         break;
       case 0x5453494c:
         if (verbosity)
-          printf("INFO chunk, size %d\n",chunk_size);
+          pc.printf("INFO chunk, size %d\n",chunk_size);
         fseek(wavefile,chunk_size,SEEK_CUR);
+         pc.printf("case4\n");
         break;
       default:
-        printf("unknown chunk type 0x%x, size %d\n",chunk_id,chunk_size);
+        pc.printf("unknown chunk type 0x%x, size %d\n",chunk_id,chunk_size);
         data=fseek(wavefile,chunk_size,SEEK_CUR);
         break;
     }
@@ -196,16 +192,15 @@
     fread(&chunk_size,4,1,wavefile);
   }
 }
-
-
+ 
+ 
 void wave_player::dac_out()
 {
   if (DAC_on) {
 #ifdef VERBOSE
-  printf("ISR rdptr %d got %u\n",DAC_rptr,DAC_fifo[DAC_rptr]);
+  pc.printf("ISR rdptr %d got %u\n",DAC_rptr,DAC_fifo[DAC_rptr]);
 #endif
     wave_DAC->write_u16(DAC_fifo[DAC_rptr]);
     DAC_rptr=(DAC_rptr+1) & 0xff;
   }
-}
-
+}
\ No newline at end of file

--- a/wave_player.h	Tue Jan 18 03:57:27 2011 +0000
+++ b/wave_player.h	Sun Feb 02 10:48:11 2014 +0000
@@ -30,8 +30,8 @@
  * }
  * @endcode
  */
+ 
 class wave_player {
-
 public:
 /** Create a wave player using a pointer to the given AnalogOut object.
  *
@@ -58,6 +58,10 @@
  */
 void set_verbosity(int v);
 
+float volume;
+//public:
+//AnalogIn position_player;
+
 private:
 void dac_out(void);
 int verbosity;