loopback_latency/common.h

// Copyright 2022 The ChromiumOS Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef LOOPBACK_LATENCY_COMMON_H_
#define LOOPBACK_LATENCY_COMMON_H_

#define CAPTURE_MORE_COUNT 50
#define PLAYBACK_COUNT 50
#define PLAYBACK_SILENT_COUNT 50
#define PLAYBACK_TIMEOUT_COUNT 100

#include <alsa/asoundlib.h>
#include <pthread.h>
#include <stdint.h>
#include <stdlib.h>

extern double g_phase;
extern pthread_mutex_t g_latency_test_mutex;
extern pthread_cond_t g_sine_start;
extern int g_terminate_playback;
extern int g_terminate_capture;
extern int g_sine_started;

extern int g_capture_count;
extern int g_playback_count;

void generate_sine(const snd_pcm_channel_area_t* areas,
                   snd_pcm_uframes_t offset,
                   int count,
                   double* _phase);

/* read_wav_file is an alternative of generate_sine. The pcm data
 * that is returned can be used for playback. It is useful when
 * testing with noise cancellation on.
 *
 * For now it doesn't care about the header information, so the wav
 * audio format must matches the format for the playback. */
void read_wav_file(const char* filename, short** pcm_data);

/* Looks for the first sample in buffer whose absolute value exceeds
 * noise_threshold. Returns the index of found sample in frames, -1
 * if not found. */
int check_for_noise(short* buf, unsigned len, unsigned channels);

unsigned long subtract_timevals(const struct timeval* end,
                                const struct timeval* beg);

#endif  // LOOPBACK_LATENCY_COMMON_H_