Playing audio with ALSA api(newbie)

[Fabio Gonzalez <fabiojosue@xxxxxxxxx>]

I'm new to ALSA. I made a program that plays a file, pure sound. The problem is that every time I write, apparently repeats a part of the previous sound. I know that the program gives segmentation fault, that the moment is not a problem. This occurs after the song finishes playing. I send the source code as an attachment. When the amount of sound that I play every moment is smaller, the sound is very bad.
#include <stdio.h>
#include <stdlib.h>
#include <alsa/asoundlib.h>
	
#define MEGA 1000000

	
	main (int argc, char *argv[])
	{
		int i;
		int err;
		short buf[4000000];
		int rate = 44100;
		snd_pcm_t *playback_handle;
		snd_pcm_hw_params_t *hw_params;
		int z;
		short* p;
		p = buf;
		
		FILE* fp = fopen("sound.raw", "r");
		
		if ((err = snd_pcm_open (&playback_handle, argv[1], SND_PCM_STREAM_PLAYBACK, 0)) < 0) {
			fprintf (stderr, "cannot open audio device %s (%s)\n", 
				 argv[1],
				 snd_strerror (err));
			exit (1);
		}
		   
		if ((err = snd_pcm_hw_params_malloc (&hw_params)) < 0) {
			fprintf (stderr, "cannot allocate hardware parameter structure (%s)\n",
				 snd_strerror (err));
			exit (1);
		}
				 
		if ((err = snd_pcm_hw_params_any (playback_handle, hw_params)) < 0) {
			fprintf (stderr, "cannot initialize hardware parameter structure (%s)\n",
				 snd_strerror (err));
			exit (1);
		}
	
		if ((err = snd_pcm_hw_params_set_access (playback_handle, hw_params, SND_PCM_ACCESS_RW_INTERLEAVED)) < 0) {
			fprintf (stderr, "cannot set access type (%s)\n",
				 snd_strerror (err));
			exit (1);
		}
	
		if ((err = snd_pcm_hw_params_set_format (playback_handle, hw_params, SND_PCM_FORMAT_S16_LE)) < 0) {
			fprintf (stderr, "cannot set sample format (%s)\n",
				 snd_strerror (err));
			exit (1);
		}
	
		if ((err = snd_pcm_hw_params_set_rate_near (playback_handle, hw_params, &rate, 0)) < 0) {
			fprintf (stderr, "cannot set sample rate (%s)\n",
				 snd_strerror (err));
			exit (1);
		}
	
		if ((err = snd_pcm_hw_params_set_channels (playback_handle, hw_params, 2)) < 0) {
			fprintf (stderr, "cannot set channel count (%s)\n",
				 snd_strerror (err));
			exit (1);
		}
	
		if ((err = snd_pcm_hw_params (playback_handle, hw_params)) < 0) {
			fprintf (stderr, "cannot set parameters (%s)\n",
				 snd_strerror (err));
			exit (1);
		}
	
		snd_pcm_hw_params_free (hw_params);
	
		if ((err = snd_pcm_prepare (playback_handle)) < 0) {
			fprintf (stderr, "cannot prepare audio interface for use (%s)\n",
				 snd_strerror (err));
			exit (1);
		}
	
	
		
		fread( &buf, 1, 4000000 * sizeof(short), fp );
		
		while( 1 ) {
		  
			if ((err = snd_pcm_writei (playback_handle, p, 131072)) != 131072) {
				fprintf (stderr, "write to audio interface failed (%s)\n",
					 snd_strerror (err));
				exit (1);
			}
			p += 131072;
			printf(".");
			fflush(stdout);
		}
		
		printf("\nOK!\n");
		fflush(stdout);
		snd_pcm_close (playback_handle);
		exit (0);
	}

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