audio.cpp

嵌入式LINUX的智能家居系统源码

#include "audio.h"
#include<stdio.h>

audio * paudio;

char * paudio_play_buf;
char * paudio_rec_buf;

bool read_phone_stop;

pthread_mutex_t l;
void * th_read_phone(void * data)
{
	data = data;
	int count = 0;
	printf("recording... \n");
	while(!read_phone_stop)
	{
		if((count = read(paudio->audio_fd,paudio_rec_buf,AUDIO_BUF_SIZE))>0)
			paudio->emit_send(count);		
	}
	return NULL;
}


void audio::start_rec()
{
	read_phone_stop = false;
	pthread_create(&th_audio_reader,NULL,th_read_phone,NULL);
	return;
}
void audio::stop_rec()
{
	read_phone_stop = true;
}
void audio::play_audio(int len)
{
	write(paudio->audio_fd,paudio_play_buf,len);
	//printf("one audio played \n");
}

void audio::emit_send(int len)
{
	emit sig_send(len);
}


/*PAGE*/

void audio::get_audio_bufs(char * buf1,char *buf2)
{
	paudio_play_buf = buf1;
	paudio_rec_buf = buf2;
}
int audio::init()
{
	printf("init begin \n");
	open_audio_dev();
	set_params();
	
	printf("init end \n");
	return 0;
}

audio::audio()
{
	paudio = this;
	read_phone_stop = true;
}
audio::~audio()
{
	close(mixer_fd);
	close(audio_fd);
}

int audio::open_audio_dev()
{
	//open displayer
	if((audio_fd = open(AUDIO_DEV,O_RDWR,0))==-1)
		printf("error open audio dev \n");

	return 0;
}
int audio::set_params()
{
//format set
	int format;
	format = AFMT_S16_NE;
	if(ioctl(audio_fd,SNDCTL_DSP_SETFMT,&format) == -1)
		printf("error control format \n");
//channels set
	int channels;
	channels = 1;
	if(ioctl(audio_fd,SNDCTL_DSP_CHANNELS,&channels) == -1)
		printf("error control channel \n");
//sample rate set
	int speed;
	speed = 8000;
	if(ioctl(audio_fd,SNDCTL_DSP_SPEED,&speed) == -1)
		printf("error control speed \n");

//mixer params set:input channel set
	if((mixer_fd = open(MIXER_DEV,O_WRONLY))== -1)
		printf("error open mixer_fd \n");
	int input_src = (1<<INPUT_CHA);
	ioctl(mixer_fd,SOUND_MIXER_WRITE_RECSRC,&input_src);
	
	printf("audio device is opened successfully \n");
	return 0;
}
/*PAGE*/