YongChing Tee
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wave_player
by 
Steve Ravet
Revision 2:73343f43feb1, committed 2013-03-06
- Comitter:
- YongChingTee
- Date:
- Wed Mar 06 00:19:08 2013 +0000
- Parent:
- 1:acc3e18e77ad
- Commit message:
- first commit
Changed in this revision
| wave_player.cpp | Show annotated file Show diff for this revision Revisions of this file |
diff -r acc3e18e77ad -r 73343f43feb1 wave_player.cpp
--- a/wave_player.cpp Tue Jan 18 03:57:27 2011 +0000
+++ b/wave_player.cpp Wed Mar 06 00:19:08 2013 +0000
@@ -1,211 +1,272 @@
-//-----------------------------------------------------------------------------
-// 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>
-
-
-//-----------------------------------------------------------------------------
-// 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;
-}
-
-//-----------------------------------------------------------------------------
-// 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
-// the DAC FIFO, and values read out of the DAC FIFO by the ISR. The DAC output
-// itself is so slow as to be unusable, but this might be handy for debugging
-// wave files that don't play
-//-----------------------------------------------------------------------------
-void wave_player::set_verbosity(int v)
-{
- 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.
-// LocalFileSystem isn't, but the SDcard is, at least for 22kHz files. The
-// SDcard filesystem can be hotrodded by increasing the SPI frequency it uses
-// internally.
-//-----------------------------------------------------------------------------
-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;
-
- 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);
- }
-
-// 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
-// to produce a single sample value. This summing and averaging happens in
-// a variable of type signed long long, to make sure that the data doesn't
-// overflow regardless of sample size (8 bits, 16 bits, 32 bits).
-//
-// 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;
-
-// 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) {
- }
- }
- 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);
- }
-}
-
-
-void wave_player::dac_out()
-{
- if (DAC_on) {
-#ifdef VERBOSE
- 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;
- }
-}
-
+//-----------------------------------------------------------------------------
+// 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>
+#include "TextLCD.h"
+
+Serial pc(USBTX, USBRX);
+DigitalIn pb_pause(p30);
+DigitalIn pb_stop(p29);
+DigitalIn pb_play(p28);
+TextLCD lcd_player(p5, p6, p7, p8, p19, p20, TextLCD::LCD20x4);
+AnalogIn position_player(p17); //slider
+//-----------------------------------------------------------------------------
+// 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;
+}
+
+//-----------------------------------------------------------------------------
+// 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
+// the DAC FIFO, and values read out of the DAC FIFO by the ISR. The DAC output
+// itself is so slow as to be unusable, but this might be handy for debugging
+// wave files that don't play
+//-----------------------------------------------------------------------------
+void wave_player::set_verbosity(int v)
+{
+ 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.
+// LocalFileSystem isn't, but the SDcard is, at least for 22kHz files. The
+// SDcard filesystem can be hotrodded by increasing the SPI frequency it uses
+// internally.
+//-----------------------------------------------------------------------------
+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;
+ pb_pause.mode(PullUp);
+ pb_stop.mode(PullUp);
+ pb_play.mode(PullUp);
+ int volume_player = 0;
+ int count = 0;
+ 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)
+ 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) {
+ 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) {
+ 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) {
+ 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) {
+ 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
+// to produce a single sample value. This summing and averaging happens in
+// a variable of type signed long long, to make sure that the data doesn't
+// overflow regardless of sample size (8 bits, 16 bits, 32 bits).
+//
+// 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)) {
+ pc.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)
+ pc.printf("16 bit channel %d data=%d ",channel,data_sptr[channel]);
+ slice_value+=data_sptr[channel];
+ break;
+ case 32:
+ if (verbosity)
+ pc.printf("32 bit channel %d data=%d ",channel,data_wptr[channel]);
+ slice_value+=data_wptr[channel];
+ break;
+ case 8:
+ if (verbosity)
+ pc.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)
+ 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;
+ //controls
+ count++;
+
+ if(count%10000 == 0)
+ {
+ volume_player = position_player*300;
+ lcd_player.cls();
+ lcd_player.printf("Volume: %d \n", volume_player); //Print out Count
+ lcd_player.printf("Mode: PLAY");
+ }
+ if(!pb_pause)
+ {
+ tick.detach();
+ lcd_player.cls();
+ lcd_player.printf("Volume: %d \n", volume_player); //Print out Count
+ lcd_player.printf("Mode: PAUSE");
+
+ while(1)
+ {
+ count++;
+ if(count%1000000 == 0)
+ {
+ volume_player = position_player*300;
+ lcd_player.cls();
+ lcd_player.printf("Volume: %d \n", volume_player); //Print out Count
+ lcd_player.printf("Mode: PAUSE");
+ }
+ //lcd_player.printf("Volume: %d \n", volume_player); //Print out Count
+ if(!pb_play)
+ {
+ tick.attach_us(this,&wave_player::dac_out, samp_int);
+ lcd_player.cls();
+ lcd_player.printf("Volume: %d \n", volume_player); //Print out Count
+ lcd_player.printf("Mode: PLAY");
+ break;
+ }
+ }
+ }
+ if(!pb_stop)
+ {
+ tick.detach();
+ //while(!pb_stop){};//prevent from adding to playlist
+ return;
+ }
+ //controls end
+ DAC_wptr=(DAC_wptr+1) & 0xff;
+ while (DAC_wptr==DAC_rptr) {
+ }
+ }
+ DAC_on=0;
+ tick.detach();
+ free(slice_buf);
+ pc.printf("case3\n");
+ break;
+ case 0x5453494c:
+ if (verbosity)
+ pc.printf("INFO chunk, size %d\n",chunk_size);
+ fseek(wavefile,chunk_size,SEEK_CUR);
+ pc.printf("case4\n");
+ break;
+ default:
+ pc.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);
+ }
+}
+
+
+void wave_player::dac_out()
+{
+ if (DAC_on) {
+#ifdef VERBOSE
+ 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;
+ }
+}
+