Diff: wave_player_appbd/wave_player.cpp

Revision:

21:df9e8f45e14c

Parent:

6:fc95af217f01

--- a/wave_player_appbd/wave_player.cpp	Mon Dec 05 20:51:36 2022 +0000
+++ b/wave_player_appbd/wave_player.cpp	Tue Dec 06 22:09:51 2022 +0000
@@ -20,9 +20,9 @@
 // constructor -- accepts an mbed pin to use for AnalogOut.  Only p18 will work
 wave_player::wave_player(AnalogOut *_dac)
 {
-  wave_DAC=_dac;
-  wave_DAC->write_u16(32768);        //DAC is 0-3.3V, so idles at ~1.6V
-  verbosity=0;
+    wave_DAC=_dac;
+    wave_DAC->write_u16(32768);        //DAC is 0-3.3V, so idles at ~1.6V
+    verbosity=0;
 }
 
 //-----------------------------------------------------------------------------
@@ -34,7 +34,7 @@
 //-----------------------------------------------------------------------------
 void wave_player::set_verbosity(int v)
 {
-  verbosity=v;
+    verbosity=v;
 }
 
 //-----------------------------------------------------------------------------
@@ -46,77 +46,77 @@
 //-----------------------------------------------------------------------------
 void wave_player::play(FILE *wavefile)
 {
-        unsigned chunk_id,chunk_size,channel;
-        unsigned data,samp_int,i;
-        short unsigned dac_data;
-        long long slice_value;
-        char *slice_buf;
-        short *data_sptr;
-        unsigned char *data_bptr;
-        int *data_wptr;
-        FMT_STRUCT wav_format;
-        long slice,num_slices;
-  DAC_wptr=0;
-  DAC_rptr=0;
-  for (i=0;i<256;i+=2) {
-    DAC_fifo[i]=0;
-    DAC_fifo[i+1]=3000;
-  }
-  DAC_wptr=4;
-  DAC_on=0;
+    unsigned chunk_id,chunk_size,channel;
+    unsigned data,samp_int,i;
+    short unsigned dac_data;
+    long long slice_value;
+    char *slice_buf;
+    short *data_sptr;
+    unsigned char *data_bptr;
+    int *data_wptr;
+    FMT_STRUCT wav_format;
+    long slice,num_slices;
+    DAC_wptr=0;
+    DAC_rptr=0;
+    for (i=0; i<256; i+=2) {
+        DAC_fifo[i]=0;
+        DAC_fifo[i+1]=3000;
+    }
+    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);
-    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);
-        }
-        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);
-        }
-        if (chunk_size > sizeof(wav_format))
-          fseek(wavefile,chunk_size-sizeof(wav_format),SEEK_CUR);
-        break;
-      case 0x61746164:
+    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);
+        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);
+                }
+                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);
+                }
+                if (chunk_size > sizeof(wav_format))
+                    fseek(wavefile,chunk_size-sizeof(wav_format),SEEK_CUR);
+                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");
-          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);
-        }
+                slice_buf=(char *)malloc(wav_format.block_align);
+                if (!slice_buf) {
+                    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);
+                }
 
 // 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; 
+                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
@@ -128,84 +128,87 @@
 // note that from what I can find that 8 bit wave files use unsigned data,
 // while 16 and 32 bit wave files use signed data
 //
-        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");
-            exit(1);
-          }
-          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
-          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]);
-                slice_value+=data_sptr[channel];
-                break;
-              case 32:
-                if (verbosity)
-                  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]);
-                slice_value+=data_bptr[channel];
-                break;
-            }
-          }
-          slice_value/=wav_format.num_channels;
-          
+                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");
+                        exit(1);
+                    }
+                    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
+                    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]);
+                                slice_value+=data_sptr[channel];
+                                break;
+                            case 32:
+                                if (verbosity)
+                                    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]);
+                                slice_value+=data_bptr[channel];
+                                break;
+                        }
+                    }
+                    slice_value/=wav_format.num_channels;
+
 // slice_value is now averaged.  Next it needs to be scaled to an unsigned 16 bit value
 // with DC offset so it can be written to the DAC.
-          switch (wav_format.sig_bps) {
-            case 8:     slice_value<<=8;
-                        break;
-            case 16:    slice_value+=32768;
-                        break;
-            case 32:    slice_value>>=16;
-                        slice_value+=32768;
-                        break;
-          }
-          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;
-          DAC_wptr=(DAC_wptr+1) & 0xff;
-          while (DAC_wptr==DAC_rptr) {
-          }
+                    switch (wav_format.sig_bps) {
+                        case 8:
+                            slice_value<<=8;
+                            break;
+                        case 16:
+                            slice_value+=32768;
+                            break;
+                        case 32:
+                            slice_value>>=16;
+                            slice_value+=32768;
+                            break;
+                    }
+                    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;
+                    DAC_wptr=(DAC_wptr+1) & 0xff;
+                    while (DAC_wptr==DAC_rptr) {
+                    }
+                }
+                DAC_on=0;
+                tick.detach();
+                free(slice_buf);
+                break;
+            case 0x5453494c:
+                if (verbosity)
+                    printf("INFO chunk, size %d\n",chunk_size);
+                fseek(wavefile,chunk_size,SEEK_CUR);
+                break;
+            default:
+                printf("unknown chunk type 0x%x, size %d\n",chunk_id,chunk_size);
+                data=fseek(wavefile,chunk_size,SEEK_CUR);
+                break;
         }
-        DAC_on=0;
-        tick.detach();
-        free(slice_buf);
-        break;
-      case 0x5453494c:
-        if (verbosity)
-          printf("INFO chunk, size %d\n",chunk_size);
-        fseek(wavefile,chunk_size,SEEK_CUR);
-        break;
-      default:
-        printf("unknown chunk type 0x%x, size %d\n",chunk_id,chunk_size);
-        data=fseek(wavefile,chunk_size,SEEK_CUR);
-        break;
+        fread(&chunk_id,4,1,wavefile);
+        fread(&chunk_size,4,1,wavefile);
     }
-    fread(&chunk_id,4,1,wavefile);
-    fread(&chunk_size,4,1,wavefile);
-  }
 }
 
 
 void wave_player::dac_out()
 {
-  if (DAC_on) {
+    if (DAC_on) {
 #ifdef VERBOSE
-  printf("ISR rdptr %d got %u\n",DAC_rptr,DAC_fifo[DAC_rptr]);
+        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;
-  }
+        wave_DAC->write_u16(DAC_fifo[DAC_rptr]);
+        DAC_rptr=(DAC_rptr+1) & 0xff;
+    }
 }