Vlad Cazan
/
WavePlayer
main.cpp@0:143457f10e26, 2009-12-06 (annotated)
- Committer:
- vcazan
- Date:
- Sun Dec 06 17:08:31 2009 +0000
- Revision:
- 0:143457f10e26
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
vcazan | 0:143457f10e26 | 1 | //todo red button and light sensor |
vcazan | 0:143457f10e26 | 2 | |
vcazan | 0:143457f10e26 | 3 | |
vcazan | 0:143457f10e26 | 4 | #include "mbed.h" |
vcazan | 0:143457f10e26 | 5 | #include "SDFileSystem.h" |
vcazan | 0:143457f10e26 | 6 | |
vcazan | 0:143457f10e26 | 7 | AnalogOut DACout(p18); |
vcazan | 0:143457f10e26 | 8 | DigitalOut led1(LED1); |
vcazan | 0:143457f10e26 | 9 | DigitalOut led2(LED2); |
vcazan | 0:143457f10e26 | 10 | DigitalOut led3(LED3); |
vcazan | 0:143457f10e26 | 11 | DigitalOut led4(LED4); |
vcazan | 0:143457f10e26 | 12 | DigitalOut digout(p8); |
vcazan | 0:143457f10e26 | 13 | Ticker tick; |
vcazan | 0:143457f10e26 | 14 | SDFileSystem sd(p5, p6, p7, p13, "sd"); |
vcazan | 0:143457f10e26 | 15 | |
vcazan | 0:143457f10e26 | 16 | #define SAMPLE_FREQ 40000 |
vcazan | 0:143457f10e26 | 17 | #define BUF_SIZE (SAMPLE_FREQ/10) |
vcazan | 0:143457f10e26 | 18 | #define SLICE_BUF_SIZE 1 |
vcazan | 0:143457f10e26 | 19 | |
vcazan | 0:143457f10e26 | 20 | void dac_out(void); |
vcazan | 0:143457f10e26 | 21 | void play_wave(char *); |
vcazan | 0:143457f10e26 | 22 | void cleanup(char *); |
vcazan | 0:143457f10e26 | 23 | void fill_adc_buf(short *, unsigned); |
vcazan | 0:143457f10e26 | 24 | void swapword(unsigned *); |
vcazan | 0:143457f10e26 | 25 | |
vcazan | 0:143457f10e26 | 26 | // a FIFO for the DAC |
vcazan | 0:143457f10e26 | 27 | short DAC_fifo[256]; |
vcazan | 0:143457f10e26 | 28 | short DAC_wptr; |
vcazan | 0:143457f10e26 | 29 | short DAC_rptr; |
vcazan | 0:143457f10e26 | 30 | short DAC_on; |
vcazan | 0:143457f10e26 | 31 | |
vcazan | 0:143457f10e26 | 32 | typedef struct uFMT_STRUCT { |
vcazan | 0:143457f10e26 | 33 | short comp_code; |
vcazan | 0:143457f10e26 | 34 | short num_channels; |
vcazan | 0:143457f10e26 | 35 | unsigned sample_rate; |
vcazan | 0:143457f10e26 | 36 | unsigned avg_Bps; |
vcazan | 0:143457f10e26 | 37 | short block_align; |
vcazan | 0:143457f10e26 | 38 | short sig_bps; |
vcazan | 0:143457f10e26 | 39 | } FMT_STRUCT; |
vcazan | 0:143457f10e26 | 40 | |
vcazan | 0:143457f10e26 | 41 | |
vcazan | 0:143457f10e26 | 42 | int main() { |
vcazan | 0:143457f10e26 | 43 | led1=0; wait(.5); led1=1; wait(.5); led1=0; |
vcazan | 0:143457f10e26 | 44 | printf("Hello, world!\n"); |
vcazan | 0:143457f10e26 | 45 | play_wave("/sd/baddonut.wav"); |
vcazan | 0:143457f10e26 | 46 | printf("Back from play_wave()\n"); |
vcazan | 0:143457f10e26 | 47 | play_wave("/sd/clint16.wav"); |
vcazan | 0:143457f10e26 | 48 | printf("Back from play_wave()\n"); |
vcazan | 0:143457f10e26 | 49 | printf("Goodbye, world!\n"); |
vcazan | 0:143457f10e26 | 50 | } |
vcazan | 0:143457f10e26 | 51 | |
vcazan | 0:143457f10e26 | 52 | void play_wave(char *wavname) |
vcazan | 0:143457f10e26 | 53 | { |
vcazan | 0:143457f10e26 | 54 | unsigned chunk_id,chunk_size,channel; |
vcazan | 0:143457f10e26 | 55 | unsigned *data_wptr,data,samp_int,i; |
vcazan | 0:143457f10e26 | 56 | short dac_data; |
vcazan | 0:143457f10e26 | 57 | char *slice_buf; |
vcazan | 0:143457f10e26 | 58 | short *data_sptr; |
vcazan | 0:143457f10e26 | 59 | char *data_bptr; |
vcazan | 0:143457f10e26 | 60 | FMT_STRUCT wav_format; |
vcazan | 0:143457f10e26 | 61 | FILE *wavfile; |
vcazan | 0:143457f10e26 | 62 | long slice,num_slices; |
vcazan | 0:143457f10e26 | 63 | DAC_wptr=0; |
vcazan | 0:143457f10e26 | 64 | DAC_rptr=0; |
vcazan | 0:143457f10e26 | 65 | for (i=0;i<256;i+=2) { |
vcazan | 0:143457f10e26 | 66 | DAC_fifo[i]=0; |
vcazan | 0:143457f10e26 | 67 | DAC_fifo[i+1]=3000; |
vcazan | 0:143457f10e26 | 68 | } |
vcazan | 0:143457f10e26 | 69 | DAC_wptr=4; |
vcazan | 0:143457f10e26 | 70 | DAC_on=0; |
vcazan | 0:143457f10e26 | 71 | |
vcazan | 0:143457f10e26 | 72 | led1=led2=led3=led4=0; |
vcazan | 0:143457f10e26 | 73 | |
vcazan | 0:143457f10e26 | 74 | printf("Playing wave file '%s'\n",wavname); |
vcazan | 0:143457f10e26 | 75 | |
vcazan | 0:143457f10e26 | 76 | wavfile=fopen(wavname,"rb"); |
vcazan | 0:143457f10e26 | 77 | if (!wavfile) { |
vcazan | 0:143457f10e26 | 78 | printf("Unable to open wav file '%s'\n",wavname); |
vcazan | 0:143457f10e26 | 79 | exit(1); |
vcazan | 0:143457f10e26 | 80 | } |
vcazan | 0:143457f10e26 | 81 | |
vcazan | 0:143457f10e26 | 82 | fread(&chunk_id,4,1,wavfile); |
vcazan | 0:143457f10e26 | 83 | fread(&chunk_size,4,1,wavfile); |
vcazan | 0:143457f10e26 | 84 | while (!feof(wavfile)) { |
vcazan | 0:143457f10e26 | 85 | printf("Read chunk ID 0x%x, size 0x%x\n",chunk_id,chunk_size); |
vcazan | 0:143457f10e26 | 86 | switch (chunk_id) { |
vcazan | 0:143457f10e26 | 87 | case 0x46464952: |
vcazan | 0:143457f10e26 | 88 | fread(&data,4,1,wavfile); |
vcazan | 0:143457f10e26 | 89 | printf("RIFF chunk\n"); |
vcazan | 0:143457f10e26 | 90 | printf(" chunk size %d (0x%x)\n",chunk_size,chunk_size); |
vcazan | 0:143457f10e26 | 91 | printf(" RIFF type 0x%x\n",data); |
vcazan | 0:143457f10e26 | 92 | break; |
vcazan | 0:143457f10e26 | 93 | case 0x20746d66: |
vcazan | 0:143457f10e26 | 94 | fread(&wav_format,sizeof(wav_format),1,wavfile); |
vcazan | 0:143457f10e26 | 95 | printf("FORMAT chunk\n"); |
vcazan | 0:143457f10e26 | 96 | printf(" chunk size %d (0x%x)\n",chunk_size,chunk_size); |
vcazan | 0:143457f10e26 | 97 | printf(" compression code %d\n",wav_format.comp_code); |
vcazan | 0:143457f10e26 | 98 | printf(" %d channels\n",wav_format.num_channels); |
vcazan | 0:143457f10e26 | 99 | printf(" %d samples/sec\n",wav_format.sample_rate); |
vcazan | 0:143457f10e26 | 100 | printf(" %d bytes/sec\n",wav_format.avg_Bps); |
vcazan | 0:143457f10e26 | 101 | printf(" block align %d\n",wav_format.block_align); |
vcazan | 0:143457f10e26 | 102 | printf(" %d bits per sample\n",wav_format.sig_bps); |
vcazan | 0:143457f10e26 | 103 | if (chunk_size > sizeof(wav_format)) |
vcazan | 0:143457f10e26 | 104 | fseek(wavfile,chunk_size-sizeof(wav_format),SEEK_CUR); |
vcazan | 0:143457f10e26 | 105 | // create a slice buffer large enough to hold multiple slices |
vcazan | 0:143457f10e26 | 106 | slice_buf=(char *)malloc(wav_format.block_align*SLICE_BUF_SIZE); |
vcazan | 0:143457f10e26 | 107 | if (!slice_buf) { |
vcazan | 0:143457f10e26 | 108 | printf("Unable to malloc slice buffer"); |
vcazan | 0:143457f10e26 | 109 | exit(1); |
vcazan | 0:143457f10e26 | 110 | } |
vcazan | 0:143457f10e26 | 111 | break; |
vcazan | 0:143457f10e26 | 112 | case 0x61746164: |
vcazan | 0:143457f10e26 | 113 | slice_buf=(char *)malloc(wav_format.block_align*SLICE_BUF_SIZE); |
vcazan | 0:143457f10e26 | 114 | if (!slice_buf) { |
vcazan | 0:143457f10e26 | 115 | printf("Unable to malloc slice buffer"); |
vcazan | 0:143457f10e26 | 116 | exit(1); |
vcazan | 0:143457f10e26 | 117 | } num_slices=chunk_size/wav_format.block_align; |
vcazan | 0:143457f10e26 | 118 | printf("DATA chunk\n"); |
vcazan | 0:143457f10e26 | 119 | printf(" chunk size %d (0x%x)\n",chunk_size,chunk_size); |
vcazan | 0:143457f10e26 | 120 | printf(" %d slices\n",num_slices); |
vcazan | 0:143457f10e26 | 121 | printf(" Ideal sample interval=%d\n",(unsigned)(1000000.0/wav_format.sample_rate)); |
vcazan | 0:143457f10e26 | 122 | samp_int=1000000/(wav_format.sample_rate); |
vcazan | 0:143457f10e26 | 123 | printf(" programmed interrupt tick interval=%d\n",samp_int); |
vcazan | 0:143457f10e26 | 124 | |
vcazan | 0:143457f10e26 | 125 | // starting up ticker to write samples out -- no printfs until tick.detach is called |
vcazan | 0:143457f10e26 | 126 | tick.attach_us(&dac_out, samp_int); |
vcazan | 0:143457f10e26 | 127 | DAC_on=1; |
vcazan | 0:143457f10e26 | 128 | led2=1; |
vcazan | 0:143457f10e26 | 129 | for (slice=0;slice<num_slices;slice+=SLICE_BUF_SIZE) { |
vcazan | 0:143457f10e26 | 130 | fread(slice_buf,wav_format.block_align*SLICE_BUF_SIZE,1,wavfile); |
vcazan | 0:143457f10e26 | 131 | if (feof(wavfile)) { |
vcazan | 0:143457f10e26 | 132 | printf("Oops -- not enough slices in the wave file\n"); |
vcazan | 0:143457f10e26 | 133 | exit(1); |
vcazan | 0:143457f10e26 | 134 | } |
vcazan | 0:143457f10e26 | 135 | data_sptr=(short *)slice_buf; |
vcazan | 0:143457f10e26 | 136 | for (i=0;i<SLICE_BUF_SIZE;i++) { |
vcazan | 0:143457f10e26 | 137 | dac_data=0; |
vcazan | 0:143457f10e26 | 138 | |
vcazan | 0:143457f10e26 | 139 | // for a stereo wave file average the two channels. |
vcazan | 0:143457f10e26 | 140 | for (channel=0;channel<wav_format.num_channels;channel++) { |
vcazan | 0:143457f10e26 | 141 | switch (wav_format.sig_bps) { |
vcazan | 0:143457f10e26 | 142 | case 16: |
vcazan | 0:143457f10e26 | 143 | dac_data+=( ((int)(*data_sptr++)) +32768)>>5; |
vcazan | 0:143457f10e26 | 144 | break; |
vcazan | 0:143457f10e26 | 145 | } |
vcazan | 0:143457f10e26 | 146 | } |
vcazan | 0:143457f10e26 | 147 | dac_data>>=1; |
vcazan | 0:143457f10e26 | 148 | DAC_fifo[DAC_wptr]=dac_data; |
vcazan | 0:143457f10e26 | 149 | DAC_wptr=(DAC_wptr+1) & 0xff; |
vcazan | 0:143457f10e26 | 150 | while (DAC_wptr==DAC_rptr) { |
vcazan | 0:143457f10e26 | 151 | led1=1; |
vcazan | 0:143457f10e26 | 152 | } |
vcazan | 0:143457f10e26 | 153 | led1=0; |
vcazan | 0:143457f10e26 | 154 | } |
vcazan | 0:143457f10e26 | 155 | } |
vcazan | 0:143457f10e26 | 156 | DAC_on=0; |
vcazan | 0:143457f10e26 | 157 | led2=0; |
vcazan | 0:143457f10e26 | 158 | tick.detach(); |
vcazan | 0:143457f10e26 | 159 | printf("Ticker detached\n"); |
vcazan | 0:143457f10e26 | 160 | led3=1; |
vcazan | 0:143457f10e26 | 161 | free(slice_buf); |
vcazan | 0:143457f10e26 | 162 | break; |
vcazan | 0:143457f10e26 | 163 | case 0x5453494c: |
vcazan | 0:143457f10e26 | 164 | printf("INFO chunk, size %d\n",chunk_size); |
vcazan | 0:143457f10e26 | 165 | fseek(wavfile,chunk_size,SEEK_CUR); |
vcazan | 0:143457f10e26 | 166 | break; |
vcazan | 0:143457f10e26 | 167 | default: |
vcazan | 0:143457f10e26 | 168 | printf("unknown chunk type 0x%x, size %d\n",chunk_id,chunk_size); |
vcazan | 0:143457f10e26 | 169 | data=fseek(wavfile,chunk_size,SEEK_CUR); |
vcazan | 0:143457f10e26 | 170 | break; |
vcazan | 0:143457f10e26 | 171 | } |
vcazan | 0:143457f10e26 | 172 | fread(&chunk_id,4,1,wavfile); |
vcazan | 0:143457f10e26 | 173 | fread(&chunk_size,4,1,wavfile); |
vcazan | 0:143457f10e26 | 174 | } |
vcazan | 0:143457f10e26 | 175 | printf("Done with wave file\n"); |
vcazan | 0:143457f10e26 | 176 | fclose(wavfile); |
vcazan | 0:143457f10e26 | 177 | led1=0; |
vcazan | 0:143457f10e26 | 178 | } |
vcazan | 0:143457f10e26 | 179 | |
vcazan | 0:143457f10e26 | 180 | |
vcazan | 0:143457f10e26 | 181 | void dac_out() |
vcazan | 0:143457f10e26 | 182 | { |
vcazan | 0:143457f10e26 | 183 | if (DAC_on) { |
vcazan | 0:143457f10e26 | 184 | digout=1; |
vcazan | 0:143457f10e26 | 185 | DACout.write(DAC_fifo[DAC_rptr]); |
vcazan | 0:143457f10e26 | 186 | DAC_rptr=(DAC_rptr+1) & 0xff; |
vcazan | 0:143457f10e26 | 187 | digout=0; |
vcazan | 0:143457f10e26 | 188 | } |
vcazan | 0:143457f10e26 | 189 | } |
vcazan | 0:143457f10e26 | 190 | |
vcazan | 0:143457f10e26 | 191 |