WavePlayer -

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Vlad Cazan / Mbed 2 deprecated 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_alignSLICE_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_alignSLICE_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

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	06 Dec 2009
Imports:	33
Forks:	0
Commits:	1
Dependents:	0
Dependencies:	1
Followers:	1

main.cpp@0:143457f10e26, 2009-12-06 (annotated)

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