StarBoardOrangeTest1 - This program is for Star Board Orange. Wave file…

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Yuji Notsu / Mbed 2 deprecated StarBoardOrangeTest1

This program is for Star Board Orange. Wave file into SD card is read, and its DAC signal output.

Dependencies: EthernetNetIf mbed HTTPServer

wavplayer.cpp@0:383bff20e783, 2010-11-25 (annotated)

Committer:: y_notsu
Date:: Thu Nov 25 14:59:16 2010 +0000
Revision:: 0:383bff20e783

Who changed what in which revision?

User	Revision	Line number	New contents of line
y_notsu	0:383bff20e783	1	/*
y_notsu	0:383bff20e783	2	Library wave file player by Tom Coxon
y_notsu	0:383bff20e783	3
y_notsu	0:383bff20e783	4	Based on WAVEplayer by Vlad Cazan/Stephan Rochon modified by Tom Coxon to:
y_notsu	0:383bff20e783	5
y_notsu	0:383bff20e783	6	1. Run correctly on the Embedded Artists LPCXpresso baseboard.
y_notsu	0:383bff20e783	7	2. To play 8 bit sample size in addition to original 16 bit
y_notsu	0:383bff20e783	8	3. To be more fault tolerant when playing wav files.
y_notsu	0:383bff20e783	9	*/
y_notsu	0:383bff20e783	10
y_notsu	0:383bff20e783	11	#include "wavplayer.h"
y_notsu	0:383bff20e783	12
y_notsu	0:383bff20e783	13	Ticker tick;
y_notsu	0:383bff20e783	14
y_notsu	0:383bff20e783	15	AnalogOut DACout(p18);
y_notsu	0:383bff20e783	16
y_notsu	0:383bff20e783	17	void WavPlayer::dac_out() {
y_notsu	0:383bff20e783	18	if (DAC_on) {
y_notsu	0:383bff20e783	19	DACout.write_u16(DAC_fifo[DAC_rptr]);
y_notsu	0:383bff20e783	20	DAC_rptr=(DAC_rptr+1) & 0xff;
y_notsu	0:383bff20e783	21	}
y_notsu	0:383bff20e783	22	}
y_notsu	0:383bff20e783	23
y_notsu	0:383bff20e783	24	//void play_wave(char *wavname) {
y_notsu	0:383bff20e783	25	void WavPlayer::play_wave(char *wavname) {
y_notsu	0:383bff20e783	26	unsigned chunk_id,chunk_size,channel;
y_notsu	0:383bff20e783	27	unsigned data,samp_int,i;
y_notsu	0:383bff20e783	28	short dac_data;
y_notsu	0:383bff20e783	29	char *slice_buf;
y_notsu	0:383bff20e783	30	short *data_sptr;
y_notsu	0:383bff20e783	31	FMT_STRUCT wav_format;
y_notsu	0:383bff20e783	32	FILE *wavfile;
y_notsu	0:383bff20e783	33	long slice,num_slices;
y_notsu	0:383bff20e783	34	DAC_wptr=0;
y_notsu	0:383bff20e783	35	DAC_rptr=0;
y_notsu	0:383bff20e783	36
y_notsu	0:383bff20e783	37	size_t result;
y_notsu	0:383bff20e783	38
y_notsu	0:383bff20e783	39	for (i=0;i<256;i+=2) {
y_notsu	0:383bff20e783	40	DAC_fifo[i]=0;
y_notsu	0:383bff20e783	41	DAC_fifo[i+1]=3000;
y_notsu	0:383bff20e783	42	}
y_notsu	0:383bff20e783	43	DAC_wptr=4;
y_notsu	0:383bff20e783	44	DAC_on=0;
y_notsu	0:383bff20e783	45
y_notsu	0:383bff20e783	46	printf("Playing wave file '%s'\r\n",wavname);
y_notsu	0:383bff20e783	47
y_notsu	0:383bff20e783	48	wavfile=fopen(wavname,"rb");
y_notsu	0:383bff20e783	49	if (!wavfile) {
y_notsu	0:383bff20e783	50	printf("Unable to open wav file '%s'\r\n",wavname);
y_notsu	0:383bff20e783	51	exit(1);
y_notsu	0:383bff20e783	52	}
y_notsu	0:383bff20e783	53
y_notsu	0:383bff20e783	54	fread(&chunk_id,4,1,wavfile);
y_notsu	0:383bff20e783	55	fread(&chunk_size,4,1,wavfile);
y_notsu	0:383bff20e783	56	while (!feof(wavfile)) {
y_notsu	0:383bff20e783	57	printf("Read chunk ID 0x%x, size 0x%x\r\n",chunk_id,chunk_size);
y_notsu	0:383bff20e783	58	switch (chunk_id) {
y_notsu	0:383bff20e783	59	case 0x46464952:
y_notsu	0:383bff20e783	60	fread(&data,4,1,wavfile);
y_notsu	0:383bff20e783	61	printf("RIFF chunk\r\n");
y_notsu	0:383bff20e783	62	printf(" chunk size %d (0x%x)\r\n",chunk_size,chunk_size);
y_notsu	0:383bff20e783	63	printf(" RIFF type 0x%x\r\n",data);
y_notsu	0:383bff20e783	64	break;
y_notsu	0:383bff20e783	65	case 0x20746d66:
y_notsu	0:383bff20e783	66	fread(&wav_format,sizeof(wav_format),1,wavfile);
y_notsu	0:383bff20e783	67	printf("FORMAT chunk\r\n");
y_notsu	0:383bff20e783	68	printf(" chunk size %d (0x%x)\r\n",chunk_size,chunk_size);
y_notsu	0:383bff20e783	69	printf(" compression code %d\r\n",wav_format.comp_code);
y_notsu	0:383bff20e783	70	printf(" %d channels\r\n",wav_format.num_channels);
y_notsu	0:383bff20e783	71	printf(" %d samples/sec\r\n",wav_format.sample_rate);
y_notsu	0:383bff20e783	72	printf(" %d bytes/sec\r\n",wav_format.avg_Bps);
y_notsu	0:383bff20e783	73	printf(" block align %d\r\n",wav_format.block_align);
y_notsu	0:383bff20e783	74	printf(" %d bits per sample\r\n",wav_format.sig_bps);
y_notsu	0:383bff20e783	75	if (chunk_size > sizeof(wav_format))
y_notsu	0:383bff20e783	76	fseek(wavfile,chunk_size-sizeof(wav_format),SEEK_CUR);
y_notsu	0:383bff20e783	77	// create a slice buffer large enough to hold multiple slices
y_notsu	0:383bff20e783	78	slice_buf=(char )malloc(wav_format.block_alignSLICE_BUF_SIZE);
y_notsu	0:383bff20e783	79	if (!slice_buf) {
y_notsu	0:383bff20e783	80	printf("Unable to malloc slice buffer");
y_notsu	0:383bff20e783	81	exit(1);
y_notsu	0:383bff20e783	82	}
y_notsu	0:383bff20e783	83	break;
y_notsu	0:383bff20e783	84	case 0x61746164:
y_notsu	0:383bff20e783	85	slice_buf=(char )malloc(wav_format.block_alignSLICE_BUF_SIZE);
y_notsu	0:383bff20e783	86	if (!slice_buf) {
y_notsu	0:383bff20e783	87	printf("Unable to malloc slice buffer");
y_notsu	0:383bff20e783	88	exit(1);
y_notsu	0:383bff20e783	89	}
y_notsu	0:383bff20e783	90	num_slices=chunk_size/wav_format.block_align;
y_notsu	0:383bff20e783	91	printf("DATA chunk\r\n");
y_notsu	0:383bff20e783	92	printf(" chunk size %d (0x%x)\r\n",chunk_size,chunk_size);
y_notsu	0:383bff20e783	93	printf(" %d slices\r\n",num_slices);
y_notsu	0:383bff20e783	94	printf(" Ideal sample interval=%d\r\n",(unsigned)(1000000.0/wav_format.sample_rate));
y_notsu	0:383bff20e783	95	samp_int=1000000/(wav_format.sample_rate);
y_notsu	0:383bff20e783	96	printf(" programmed interrupt tick interval=%d\r\n",samp_int);
y_notsu	0:383bff20e783	97
y_notsu	0:383bff20e783	98	// starting up ticker to write samples out -- no printfs until tick.detach is called
y_notsu	0:383bff20e783	99	tick.attach_us(this,&WavPlayer::dac_out, samp_int);
y_notsu	0:383bff20e783	100	DAC_on=1;
y_notsu	0:383bff20e783	101	for (slice=0;slice<num_slices;slice+=SLICE_BUF_SIZE) {
y_notsu	0:383bff20e783	102
y_notsu	0:383bff20e783	103	result = fread(slice_buf,wav_format.block_align*SLICE_BUF_SIZE,1,wavfile);
y_notsu	0:383bff20e783	104	if (feof(wavfile)) {
y_notsu	0:383bff20e783	105	printf("Oops -- not enough slices in the wave file\r\n");
y_notsu	0:383bff20e783	106
y_notsu	0:383bff20e783	107	break;
y_notsu	0:383bff20e783	108	}
y_notsu	0:383bff20e783	109
y_notsu	0:383bff20e783	110	data_sptr=(short *)slice_buf;
y_notsu	0:383bff20e783	111	for (i=0;i<SLICE_BUF_SIZE;i++) {
y_notsu	0:383bff20e783	112	dac_data=0;
y_notsu	0:383bff20e783	113
y_notsu	0:383bff20e783	114	// for a stereo wave file average the two channels.
y_notsu	0:383bff20e783	115	for (channel=0;channel<wav_format.num_channels;channel++) {
y_notsu	0:383bff20e783	116	switch (wav_format.sig_bps) {
y_notsu	0:383bff20e783	117	case 16:
y_notsu	0:383bff20e783	118	dac_data+=( ((int)(*data_sptr++)) +32768 );
y_notsu	0:383bff20e783	119	break;
y_notsu	0:383bff20e783	120	case 8:
y_notsu	0:383bff20e783	121	dac_data+=( ((int)(*data_sptr++)) +32768 <<8);
y_notsu	0:383bff20e783	122	break;
y_notsu	0:383bff20e783	123	}
y_notsu	0:383bff20e783	124	}
y_notsu	0:383bff20e783	125	DAC_fifo[DAC_wptr]=dac_data;
y_notsu	0:383bff20e783	126	DAC_wptr=(DAC_wptr+1) & 0xff;
y_notsu	0:383bff20e783	127	while (DAC_wptr==DAC_rptr) {
y_notsu	0:383bff20e783	128	wait_us(10);
y_notsu	0:383bff20e783	129	}
y_notsu	0:383bff20e783	130	}
y_notsu	0:383bff20e783	131	}
y_notsu	0:383bff20e783	132	DAC_on=0;
y_notsu	0:383bff20e783	133	tick.detach();
y_notsu	0:383bff20e783	134	printf("Ticker detached\r\n");
y_notsu	0:383bff20e783	135	free(slice_buf);
y_notsu	0:383bff20e783	136	break;
y_notsu	0:383bff20e783	137	case 0x5453494c:
y_notsu	0:383bff20e783	138	printf("INFO chunk, size %d\r\n",chunk_size);
y_notsu	0:383bff20e783	139	fseek(wavfile,chunk_size,SEEK_CUR);
y_notsu	0:383bff20e783	140	break;
y_notsu	0:383bff20e783	141	default:
y_notsu	0:383bff20e783	142	printf("unknown chunk type 0x%x, size %d\r\n",chunk_id,chunk_size);
y_notsu	0:383bff20e783	143	data=fseek(wavfile,chunk_size,SEEK_CUR);
y_notsu	0:383bff20e783	144	break;
y_notsu	0:383bff20e783	145	}
y_notsu	0:383bff20e783	146	fread(&chunk_id,4,1,wavfile);
y_notsu	0:383bff20e783	147	fread(&chunk_size,4,1,wavfile);
y_notsu	0:383bff20e783	148	}
y_notsu	0:383bff20e783	149	printf("++++++++++++ Done with wave file ++++++++++\r\n");
y_notsu	0:383bff20e783	150	fclose(wavfile);
y_notsu	0:383bff20e783	151	}
y_notsu	0:383bff20e783	152
y_notsu	0:383bff20e783	153

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	25 Nov 2010
Imports:	22
Forks:	0
Commits:	1
Dependents:	0
Dependencies:	4
Followers:	2

wavplayer.cpp@0:383bff20e783, 2010-11-25 (annotated)

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