webrtc_oss.cpp

#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <linux/soundcard.h>

#include <webrtc_audio_processing/module_common_types.h>
#include <webrtc_audio_processing/audio_processing.h>


int main()
{
	int errno;
	int format    = AFMT_S16_NE; /* native endian */
	int speed     = 32000;
	int blocksize = speed / 100;
	int channels  = 1;
	int fd = open("/dev/dsp", O_RDWR);

	if (!fd) {
		printf("Could not open sound device\n");
		return -1;
	}

	//if (0 != ioctl(fd, FIONBIO, &nonblock))
	//	return errno;
	if (0 != ioctl(fd, SNDCTL_DSP_SETFMT, &format))
		return errno;
	if (0 != ioctl(fd, SNDCTL_DSP_CHANNELS, &channels))
		return errno;
	if (2 == channels) {
		int stereo = 1;
		if (0 != ioctl(fd, SNDCTL_DSP_STEREO, &stereo))
			return errno;
	}
	if (0 != ioctl(fd, SNDCTL_DSP_SPEED, &speed))
		return errno;

	printf("oss: init: %d Hz %d ch, blocksize=%d\n",
	     speed, channels, blocksize);

	blocksize = speed / 100;
	char buf[320];

	// BEGIN WEBRTC TESTBENCH

	webrtc::AudioProcessing* apm = webrtc::AudioProcessing::Create(0);
	apm->set_sample_rate_hz(speed);
	apm->set_num_channels(1, 1);
	apm->set_num_reverse_channels(1);
	
	apm->echo_cancellation()->Enable(true);
	apm->echo_cancellation()->set_device_sample_rate_hz(32000);
	
	apm->set_stream_delay_ms(0);

	while (true) {
		webrtc::AudioFrame frame;
		frame._audioChannel = 1;// ss->channels
		frame._frequencyInHz = 32000;
		frame._payloadDataLengthInSamples = blocksize;
		
		read(fd, frame._payloadData, blocksize);

		errno = apm->AnalyzeReverseStream(&frame);
		if (errno) {
			printf("AnalyzeReverseStream() = %d\n", errno);
		}

		apm->set_stream_delay_ms(0);
		errno = apm->ProcessStream(&frame);
		if (errno) {
			printf("ProcessStream() = %d\n", errno);
		}

		write(fd, frame._payloadData, blocksize);
	}

	webrtc::AudioProcessing::Destroy(apm);
}