getopt_long函数的典型使用

getopt_long函数的典型使用

在实际开发中 需要自行开发一些测试程序。参考glibc 等LINUX 标准命令实现即可。

int main(int argc, char const *argv[])
{
	int ret = 0,i;
	char buffer[1024*2];
	int len_read,len_write,offset,chunk_bytes;
	fd_set rfds,wfds;
	int io_select = -1;
	char file_name[100]={0,};
	struct fh81_audio_cfg_arg audio_cfg;
	int option_index, c;
	static const char short_options[] = "hC:P:r:v:s:b:p:";
	static const struct option long_options[] = {
		{"help",no_argument,0,'h'},
		{"capture",required_argument,0,'C'},
		{"playback",required_argument,0,'P'},
		{"rate",required_argument,0,'r'},
		{"volume",required_argument,0,'v'},
		{"select_io",required_argument,0,'s'},
		{"buffer_size",required_argument,0,'b'},
		{"period_size",required_argument,0,'p'},
		{0, 0, 0, 0}
	};
	/*default config*/
	audio_cfg.volume = 85;
	audio_cfg.rate = 8000;
	audio_cfg.frame_bit = 16;
	audio_cfg.channels = 1;
	audio_cfg.period_size = 1024;
	audio_cfg.buffer_size = audio_cfg.period_size << 3;


	while ((c = getopt_long(argc, argv, short_options, long_options, &option_index)) != -1)  {
		switch(c) {
			case 'h':
				print_usage();
				return 0;
			case 'C':
				strcpy(file_name,optarg);
				stream = 0;
				break;
			case 'P':
				strcpy(file_name,optarg);
				stream = 1;
				break;
			case 'r':
				audio_cfg.rate = strtol(optarg, NULL, 0);
				break;
			case 'v':
				audio_cfg.volume = strtol(optarg, NULL, 0);
				break;
			case 's':
				break;
			case 'b':
				audio_cfg.buffer_size = strtol(optarg, NULL, 0);
				break;
			case 'p':
				audio_cfg.period_size = strtol(optarg, NULL, 0);
				break;
			default:
				printf("unsupport cmd,try -h for help\n");
				return 1;
		}
	}
	if (-1 == stream) {
		printf("please select capture or playback\n");
		return 0;
	}
	if (strlen(file_name) < 1) {
		printf("please input the file_name to capture or playback\n");
		return 0;
	}
	signal(SIGINT, signal_handler);
	signal(SIGTERM, signal_handler);
	signal(SIGABRT, signal_handler);
	audio_fd = open("/dev/fh_linbao_i2s", O_RDWR);
	if (audio_fd == -1) {
		perror("open /dev/fh_audio");
		return -1;
	}
	if (0 == stream) {
		/*capture test*/
		ret = ioctl(audio_fd, I2S_INIT_CAPTURE_MEM, &audio_cfg);
		if (ret < 0) {
			printf("[ERROR]: ioctl AC_INIT_CAPTURE_MEM failed ret=%d\n", ret);
			return ret;
		}
		chunk_bytes = frames_to_bytes(audio_cfg.frame_bit,audio_cfg.period_size);
		fd_file = open(file_name,O_RDWR|O_CREAT|O_TRUNC);
		ret = ioctl(audio_fd, I2S_AI_EN, NULL);
		if (ret < 0) {
			printf("[ERROR]: ioctl AC_AI_EN failed ret=%d\n", ret);
			return ret;
		}

		while(1) {
			FD_ZERO(&rfds);
			FD_SET(audio_fd,&rfds);
			select(audio_fd+1,&rfds,NULL,NULL,NULL);

			if (FD_ISSET(audio_fd,&rfds)) {
				len_read = read(audio_fd,buffer,chunk_bytes);

				write(fd_file,buffer,len_read);
			}

		}
		ret = ioctl(audio_fd, I2S_AI_DISABLE, NULL);

	} else {
		/*playback test*/
		fd_file = open(file_name,O_RDONLY);
		if (fd_file < 0) {
			printf("playback file not exits\n");
			return -1;
		}
		ret = ioctl(audio_fd, I2S_INIT_PLAYBACK_MEM, &audio_cfg);
		if (ret < 0) {
			printf("[ERROR]: ioctl AC_INIT_PLAYBACK_MEM failed ret=%d\n", ret);
			return ret;
		}
		ret = ioctl(audio_fd, I2S_AO_EN, NULL);
		if (ret < 0) {
			printf("[ERROR]: ioctl AC_AO_EN failed ret=%d\n", ret);
			return ret;
		}
		chunk_bytes = frames_to_bytes(audio_cfg.frame_bit,audio_cfg.period_size);
		while(1) {
			len_read = read(fd_file,buffer,chunk_bytes);
			if (len_read <= 0) {
				printf("playback finished %d\n",len_read);
				break;
			}
			if (len_read < chunk_bytes) {
				fill_silence_data(buffer,chunk_bytes, chunk_bytes - len_read);
			}
			FD_ZERO(&wfds);
			FD_SET(audio_fd,&wfds);
			select(audio_fd+1,NULL,&wfds,NULL,NULL);
			if (FD_ISSET(audio_fd,&wfds)) {
				len_write = write(audio_fd,buffer,chunk_bytes);
				//printf("write len = %d\n",len_write);
			}
		}
		ret = ioctl(audio_fd, I2S_AO_DISABLE, NULL);

	}
	close(fd_file);
	fd_file = -1;
	close(audio_fd);
	audio_fd = -1;
	return 0;
}

上述是I2S的一个数据捕获测试DEMO

arm-linux# ./i2s_test -h
-h :help
-C file_name :capture
-P file_name :playback
-r n :n=sample rate(8000/16000/32000/44100/48000)
-v n :n=input volume(0~100)
-s n :n=0/1/2/3(0=mic_in;1=line_in;2=speaker_out;3=line_out)
-b n :n=buffer size
-p n :n=period_size
capture example: ./i2s_test -C test.dat -r 44100 -v 80 -s 1 -p 1024 -b 8196
playback example: ./i2s_test -P test.dat -r 44100 -s 2 -p 1024 -b 8196

getopt_long 的参数获取 具体可参考上述代码实现