Reproductor de archivos wav
Dependencies: SDFileSystem mbed-src mbed
Fork of SDFileSystem_HelloWorld by
wavplayer.cpp@1:6f7dafed256b, 2015-06-12 (annotated)
- Committer:
- EduardoVitela
- Date:
- Fri Jun 12 04:49:18 2015 +0000
- Revision:
- 1:6f7dafed256b
publicando
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
EduardoVitela | 1:6f7dafed256b | 1 | /* |
EduardoVitela | 1:6f7dafed256b | 2 | Library wave file player by Tom Coxon |
EduardoVitela | 1:6f7dafed256b | 3 | |
EduardoVitela | 1:6f7dafed256b | 4 | Based on WAVEplayer by Vlad Cazan/Stephan Rochon modified by Tom Coxon to: |
EduardoVitela | 1:6f7dafed256b | 5 | |
EduardoVitela | 1:6f7dafed256b | 6 | 1. Run correctly on the Embedded Artists LPCXpresso baseboard. |
EduardoVitela | 1:6f7dafed256b | 7 | 2. To play 8 bit sample size in addition to original 16 bit |
EduardoVitela | 1:6f7dafed256b | 8 | 3. To be more fault tolerant when playing wav files. |
EduardoVitela | 1:6f7dafed256b | 9 | */ |
EduardoVitela | 1:6f7dafed256b | 10 | |
EduardoVitela | 1:6f7dafed256b | 11 | #include "wavplayer.h" |
EduardoVitela | 1:6f7dafed256b | 12 | |
EduardoVitela | 1:6f7dafed256b | 13 | Ticker tick; |
EduardoVitela | 1:6f7dafed256b | 14 | Serial pc(USBTX,USBRX); |
EduardoVitela | 1:6f7dafed256b | 15 | DigitalIn p1(SW1); |
EduardoVitela | 1:6f7dafed256b | 16 | AnalogOut DACout(PTE30); |
EduardoVitela | 1:6f7dafed256b | 17 | |
EduardoVitela | 1:6f7dafed256b | 18 | void WavPlayer::dac_out() { |
EduardoVitela | 1:6f7dafed256b | 19 | if (DAC_on) { |
EduardoVitela | 1:6f7dafed256b | 20 | DACout.write_u16(DAC_fifo[DAC_rptr]); |
EduardoVitela | 1:6f7dafed256b | 21 | DAC_rptr=(DAC_rptr+1) & 0xff; |
EduardoVitela | 1:6f7dafed256b | 22 | } |
EduardoVitela | 1:6f7dafed256b | 23 | } |
EduardoVitela | 1:6f7dafed256b | 24 | |
EduardoVitela | 1:6f7dafed256b | 25 | void WavPlayer::play_wave(char *wavname) { |
EduardoVitela | 1:6f7dafed256b | 26 | unsigned chunk_id,chunk_size,channel; |
EduardoVitela | 1:6f7dafed256b | 27 | unsigned data,samp_int,i; |
EduardoVitela | 1:6f7dafed256b | 28 | short dac_data; |
EduardoVitela | 1:6f7dafed256b | 29 | char *slice_buf; |
EduardoVitela | 1:6f7dafed256b | 30 | short *data_sptr; |
EduardoVitela | 1:6f7dafed256b | 31 | FMT_STRUCT wav_format; |
EduardoVitela | 1:6f7dafed256b | 32 | FILE *wavfile; |
EduardoVitela | 1:6f7dafed256b | 33 | long slice,num_slices; |
EduardoVitela | 1:6f7dafed256b | 34 | DAC_wptr=0; |
EduardoVitela | 1:6f7dafed256b | 35 | DAC_rptr=0; |
EduardoVitela | 1:6f7dafed256b | 36 | |
EduardoVitela | 1:6f7dafed256b | 37 | size_t result; |
EduardoVitela | 1:6f7dafed256b | 38 | |
EduardoVitela | 1:6f7dafed256b | 39 | for (i=0;i<256;i+=2) { |
EduardoVitela | 1:6f7dafed256b | 40 | DAC_fifo[i]=0; |
EduardoVitela | 1:6f7dafed256b | 41 | DAC_fifo[i+1]=3000; |
EduardoVitela | 1:6f7dafed256b | 42 | } |
EduardoVitela | 1:6f7dafed256b | 43 | DAC_wptr=4; |
EduardoVitela | 1:6f7dafed256b | 44 | DAC_on=0; |
EduardoVitela | 1:6f7dafed256b | 45 | |
EduardoVitela | 1:6f7dafed256b | 46 | pc.printf("Reproduciendo arcivo '%s'\r\n",wavname); |
EduardoVitela | 1:6f7dafed256b | 47 | |
EduardoVitela | 1:6f7dafed256b | 48 | wavfile=fopen(wavname,"rb"); |
EduardoVitela | 1:6f7dafed256b | 49 | if (!wavfile) { |
EduardoVitela | 1:6f7dafed256b | 50 | pc.printf("Incapas de abrir archivo '%s'\r\n",wavname); |
EduardoVitela | 1:6f7dafed256b | 51 | exit(1); |
EduardoVitela | 1:6f7dafed256b | 52 | } |
EduardoVitela | 1:6f7dafed256b | 53 | |
EduardoVitela | 1:6f7dafed256b | 54 | fread(&chunk_id,4,1,wavfile); |
EduardoVitela | 1:6f7dafed256b | 55 | fread(&chunk_size,4,1,wavfile); |
EduardoVitela | 1:6f7dafed256b | 56 | while (!feof(wavfile)) { |
EduardoVitela | 1:6f7dafed256b | 57 | pc.printf("Read chunk ID 0x%x, size 0x%x\r\n",chunk_id,chunk_size); |
EduardoVitela | 1:6f7dafed256b | 58 | switch (chunk_id) { |
EduardoVitela | 1:6f7dafed256b | 59 | case 0x46464952: |
EduardoVitela | 1:6f7dafed256b | 60 | fread(&data,4,1,wavfile); |
EduardoVitela | 1:6f7dafed256b | 61 | pc.printf("RIFF chunk\r\n"); |
EduardoVitela | 1:6f7dafed256b | 62 | pc.printf(" chunk size %d (0x%x)\r\n",chunk_size,chunk_size); |
EduardoVitela | 1:6f7dafed256b | 63 | pc.printf(" RIFF type 0x%x\r\n",data); |
EduardoVitela | 1:6f7dafed256b | 64 | break; |
EduardoVitela | 1:6f7dafed256b | 65 | case 0x20746d66: |
EduardoVitela | 1:6f7dafed256b | 66 | fread(&wav_format,sizeof(wav_format),1,wavfile); |
EduardoVitela | 1:6f7dafed256b | 67 | pc.printf("FORMAT chunk\r\n"); |
EduardoVitela | 1:6f7dafed256b | 68 | pc.printf(" chunk size %d (0x%x)\r\n",chunk_size,chunk_size); |
EduardoVitela | 1:6f7dafed256b | 69 | pc.printf(" compression code %d\r\n",wav_format.comp_code); |
EduardoVitela | 1:6f7dafed256b | 70 | pc.printf(" %d channels\r\n",wav_format.num_channels); |
EduardoVitela | 1:6f7dafed256b | 71 | pc.printf(" %d samples/sec\r\n",wav_format.sample_rate); |
EduardoVitela | 1:6f7dafed256b | 72 | pc.printf(" %d bytes/sec\r\n",wav_format.avg_Bps); |
EduardoVitela | 1:6f7dafed256b | 73 | pc.printf(" block align %d\r\n",wav_format.block_align); |
EduardoVitela | 1:6f7dafed256b | 74 | pc.printf(" %d bits per sample\r\n",wav_format.sig_bps); |
EduardoVitela | 1:6f7dafed256b | 75 | if (chunk_size > sizeof(wav_format)) |
EduardoVitela | 1:6f7dafed256b | 76 | fseek(wavfile,chunk_size-sizeof(wav_format),SEEK_CUR); |
EduardoVitela | 1:6f7dafed256b | 77 | // create a slice buffer large enough to hold multiple slices |
EduardoVitela | 1:6f7dafed256b | 78 | slice_buf=(char *)malloc(wav_format.block_align*SLICE_BUF_SIZE); |
EduardoVitela | 1:6f7dafed256b | 79 | if (!slice_buf) { |
EduardoVitela | 1:6f7dafed256b | 80 | pc.printf("Unable to malloc slice buffer"); |
EduardoVitela | 1:6f7dafed256b | 81 | exit(1); |
EduardoVitela | 1:6f7dafed256b | 82 | } |
EduardoVitela | 1:6f7dafed256b | 83 | break; |
EduardoVitela | 1:6f7dafed256b | 84 | case 0x61746164: |
EduardoVitela | 1:6f7dafed256b | 85 | slice_buf=(char *)malloc(wav_format.block_align*SLICE_BUF_SIZE); |
EduardoVitela | 1:6f7dafed256b | 86 | if (!slice_buf) { |
EduardoVitela | 1:6f7dafed256b | 87 | pc.printf("Unable to malloc slice buffer"); |
EduardoVitela | 1:6f7dafed256b | 88 | exit(1); |
EduardoVitela | 1:6f7dafed256b | 89 | } |
EduardoVitela | 1:6f7dafed256b | 90 | num_slices=chunk_size/wav_format.block_align; |
EduardoVitela | 1:6f7dafed256b | 91 | pc.printf("DATA chunk\r\n"); |
EduardoVitela | 1:6f7dafed256b | 92 | pc.printf(" chunk size %d (0x%x)\r\n",chunk_size,chunk_size); |
EduardoVitela | 1:6f7dafed256b | 93 | pc.printf(" %d slices\r\n",num_slices); |
EduardoVitela | 1:6f7dafed256b | 94 | pc.printf(" Ideal sample interval=%d\r\n",(unsigned)(1000000.0/wav_format.sample_rate)); |
EduardoVitela | 1:6f7dafed256b | 95 | samp_int=1000000/(wav_format.sample_rate); |
EduardoVitela | 1:6f7dafed256b | 96 | pc.printf(" programmed interrupt tick interval=%d\r\n",samp_int); |
EduardoVitela | 1:6f7dafed256b | 97 | |
EduardoVitela | 1:6f7dafed256b | 98 | // starting up ticker to write samples out -- no printfs until tick.detach is called |
EduardoVitela | 1:6f7dafed256b | 99 | tick.attach_us(this,&WavPlayer::dac_out, samp_int); |
EduardoVitela | 1:6f7dafed256b | 100 | DAC_on=1; |
EduardoVitela | 1:6f7dafed256b | 101 | for (slice=0;slice<num_slices;slice+=SLICE_BUF_SIZE) { |
EduardoVitela | 1:6f7dafed256b | 102 | |
EduardoVitela | 1:6f7dafed256b | 103 | result = fread(slice_buf,wav_format.block_align*SLICE_BUF_SIZE,1,wavfile); |
EduardoVitela | 1:6f7dafed256b | 104 | if (feof(wavfile)) { |
EduardoVitela | 1:6f7dafed256b | 105 | pc.printf("Oops -- not enough slices in the wave file\r\n"); |
EduardoVitela | 1:6f7dafed256b | 106 | |
EduardoVitela | 1:6f7dafed256b | 107 | break; |
EduardoVitela | 1:6f7dafed256b | 108 | } |
EduardoVitela | 1:6f7dafed256b | 109 | |
EduardoVitela | 1:6f7dafed256b | 110 | data_sptr=(short *)slice_buf; |
EduardoVitela | 1:6f7dafed256b | 111 | for (i=0;i<SLICE_BUF_SIZE;i++) { |
EduardoVitela | 1:6f7dafed256b | 112 | dac_data=0; |
EduardoVitela | 1:6f7dafed256b | 113 | |
EduardoVitela | 1:6f7dafed256b | 114 | // for a stereo wave file average the two channels. |
EduardoVitela | 1:6f7dafed256b | 115 | for (channel=0;channel<wav_format.num_channels;channel++) { |
EduardoVitela | 1:6f7dafed256b | 116 | switch (wav_format.sig_bps) { |
EduardoVitela | 1:6f7dafed256b | 117 | case 16: |
EduardoVitela | 1:6f7dafed256b | 118 | dac_data+=( ((int)(*data_sptr++)) +32768 ); |
EduardoVitela | 1:6f7dafed256b | 119 | break; |
EduardoVitela | 1:6f7dafed256b | 120 | case 8: |
EduardoVitela | 1:6f7dafed256b | 121 | dac_data+=( ((int)(*data_sptr++)) +32768 <<8); |
EduardoVitela | 1:6f7dafed256b | 122 | break; |
EduardoVitela | 1:6f7dafed256b | 123 | } |
EduardoVitela | 1:6f7dafed256b | 124 | } |
EduardoVitela | 1:6f7dafed256b | 125 | DAC_fifo[DAC_wptr]=dac_data; |
EduardoVitela | 1:6f7dafed256b | 126 | DAC_wptr=(DAC_wptr+1) & 0xff; |
EduardoVitela | 1:6f7dafed256b | 127 | while (DAC_wptr==DAC_rptr) { |
EduardoVitela | 1:6f7dafed256b | 128 | wait_us(10); |
EduardoVitela | 1:6f7dafed256b | 129 | } |
EduardoVitela | 1:6f7dafed256b | 130 | } |
EduardoVitela | 1:6f7dafed256b | 131 | if(p1==0){ |
EduardoVitela | 1:6f7dafed256b | 132 | break; |
EduardoVitela | 1:6f7dafed256b | 133 | } |
EduardoVitela | 1:6f7dafed256b | 134 | } |
EduardoVitela | 1:6f7dafed256b | 135 | DAC_on=0; |
EduardoVitela | 1:6f7dafed256b | 136 | tick.detach(); |
EduardoVitela | 1:6f7dafed256b | 137 | pc.printf("Ticker detached\r\n"); |
EduardoVitela | 1:6f7dafed256b | 138 | free(slice_buf); |
EduardoVitela | 1:6f7dafed256b | 139 | break; |
EduardoVitela | 1:6f7dafed256b | 140 | case 0x5453494c: |
EduardoVitela | 1:6f7dafed256b | 141 | pc.printf("INFO chunk, size %d\r\n",chunk_size); |
EduardoVitela | 1:6f7dafed256b | 142 | fseek(wavfile,chunk_size,SEEK_CUR); |
EduardoVitela | 1:6f7dafed256b | 143 | break; |
EduardoVitela | 1:6f7dafed256b | 144 | default: |
EduardoVitela | 1:6f7dafed256b | 145 | pc.printf("unknown chunk type 0x%x, size %d\r\n",chunk_id,chunk_size); |
EduardoVitela | 1:6f7dafed256b | 146 | data=fseek(wavfile,chunk_size,SEEK_CUR); |
EduardoVitela | 1:6f7dafed256b | 147 | break; |
EduardoVitela | 1:6f7dafed256b | 148 | } |
EduardoVitela | 1:6f7dafed256b | 149 | fread(&chunk_id,4,1,wavfile); |
EduardoVitela | 1:6f7dafed256b | 150 | fread(&chunk_size,4,1,wavfile); |
EduardoVitela | 1:6f7dafed256b | 151 | } |
EduardoVitela | 1:6f7dafed256b | 152 | pc.printf("++++++++++++ Fin de reproducion del archivo ++++++++++\r\n"); |
EduardoVitela | 1:6f7dafed256b | 153 | fclose(wavfile); |
EduardoVitela | 1:6f7dafed256b | 154 | } |
EduardoVitela | 1:6f7dafed256b | 155 | |
EduardoVitela | 1:6f7dafed256b | 156 |