Fixes

PCM_Wav_Play.c

@@ -14,8 +14,8 @@
 #include "wave_play.h"
 
 #define SECOND 1000000
-#define file_name "sample_wav.wav"
-
+#define file_name "test.wav"
+#define SAMPLE_RATE 8000
 
 /*
  * @main program. It opens a PCM devices, initializes paramters and 
@@ -30,16 +30,32 @@ int main(){
 	// Structure used to configure the PCM device
 	snd_pcm_hw_params_t *params;
 	// name of the device, default for now
-	char * device_name =  "default";
+	char * device_name =  "plug:default";
 	// Variable to store return values of functions
 	int return_val;
 	// frames used to determine size of a period
 	snd_pcm_uframes_t frames;
 	// Buffer to store data to be captured or played
 	char *buffer;
-	//char * file_name = "sample_wav.wav";
 	unsigned int size, sample_rate, period_time, loop_time, num_loops;
 
+
+	// Get list of devie names
+	char **hints;
+	return_val = snd_device_name_hint(-1, "pcm", (void***)&hints);
+	char ** n = hints;
+	while (*n != NULL) {
+
+		char *name = snd_device_name_get_hint(*n, "NAME");
+		printf("Devide found : %s \n", name);
+		if (name != NULL && 0 != strcmp("null", name)) {
+			//Copy name to another buffer and then free it
+			free(name);
+		}
+		n++;
+	}//End of while
+	// end list of devie name retrival 
+
 	// open PCM device 
 	if ( (return_val = snd_pcm_open(&handle, device_name, 
                     SND_PCM_STREAM_PLAYBACK, 0)) < 0){
@@ -48,9 +64,11 @@ int main(){
             , snd_strerror(return_val));
 		exit(1);
 	}
+
 	fprintf(stdout, "PCM Device \"%s\" successfully opened\n" \
 			, device_name );
 
+
     // Allocate params 
 	snd_pcm_hw_params_alloca(&params);
 	// Initialize with default values
@@ -80,13 +98,16 @@ int main(){
 	}
 	// sample rate of sample wav file is 256000 bits/second 
 	// Invalid argument error if Sample rate is higher than 200,000
-	sample_rate = 8000;
+	sample_rate = SAMPLE_RATE;
 	if (snd_pcm_hw_params_set_rate_near(handle, params, 
                                   &sample_rate, 0) < 0){
 		fprintf(stderr, 
             "unable to set sample rate to %d ",sample_rate);
 		exit(1);
-	}							  
+	}	
+	snd_pcm_hw_params_set_rate(handle, params, 
+                                  sample_rate, 0);
+
 	// set period size to 32 frames. A frame has 2 samples, left and 
 	// right samples. A sample has 2 bytes, most and least significant. 
 	frames = 64;

wave_play.c

@@ -56,7 +56,7 @@ int read_wave_and_play(char *file_name, snd_pcm_t *handle,
 	char * data_temp_buffer;
 
 
-	fprintf(stdout,"Wave file reading started \n");
+	fprintf(stdout,"Wave file reading started \n\n\n");
 
 	if ( (file_ptr = fopen(file_name, "rb") ) == NULL){
 			printf("error in opening file");
@@ -65,15 +65,15 @@ int read_wave_and_play(char *file_name, snd_pcm_t *handle,
 
 	// read header data
 	ret = fread(wave_header.riff, sizeof(wave_header.riff),1,file_ptr);
-	printf("RIFF header values %s .\n",wave_header.riff);
+	printf("RIFF header values %s.\n",wave_header.riff);
 	// read file size
 	ret = fread(temp_buffer, sizeof(temp_buffer), 1, file_ptr);
 	wave_header.file_size = temp_buffer[0] | (temp_buffer[1] << 8) | \
 	                (temp_buffer[2] << 16) | (temp_buffer[3] << 24);
-	printf("Wav file size %u KB.\n",wave_header.file_size / 1024);
+	printf("Wav file size %u KB.\n",wave_header.file_size );
 	// get wav header
 	ret = fread(wave_header.wave, sizeof(wave_header.wave),1, file_ptr);
-	printf("Wave marker is %s .\n",wave_header.wave);
+	printf("Wave marker is %s.\n",wave_header.wave);
 	// fmt marker
 	ret = fread(wave_header.fmt_chunk_marker, \
 				sizeof(wave_header.fmt_chunk_marker), 1, file_ptr);
@@ -162,8 +162,8 @@ int read_wave_and_play(char *file_name, snd_pcm_t *handle,
 		for (i=0; i< number_of_samples; i++){
 
 			ret = fread(data_temp_buffer, NUM_BYTES ,frames, file_ptr);
-			printf("Reading sample %d of %d %lu samples \n",i,\
-				number_of_samples , sizeof(data_temp_buffer));
+			//printf("Reading sample %d/%d\n",i,\
+			//	number_of_samples );
 			if (ret == 0) {
 				fprintf(stderr, "file reading error \n");
 				break;