media/libcubeb/test/test_latency.cpp


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#include "cubeb/cubeb.h"
#include "gtest/gtest.h"
#include <memory>
#include <stdlib.h>
// #define ENABLE_NORMAL_LOG
// #define ENABLE_VERBOSE_LOG
#include "common.h"

TEST(cubeb, latency)
{
  cubeb * ctx = NULL;
  int r;
  uint32_t max_channels;
  uint32_t preferred_rate;
  uint32_t latency_frames;

  r = common_init(&ctx, "Cubeb audio test");
  ASSERT_EQ(r, CUBEB_OK);

  std::unique_ptr<cubeb, decltype(&cubeb_destroy)> cleanup_cubeb_at_exit(
      ctx, cubeb_destroy);

  r = cubeb_get_max_channel_count(ctx, &max_channels);
  ASSERT_TRUE(r == CUBEB_OK || r == CUBEB_ERROR_NOT_SUPPORTED);
  if (r == CUBEB_OK) {
    ASSERT_GT(max_channels, 0u);
  }

  r = cubeb_get_preferred_sample_rate(ctx, &preferred_rate);
  ASSERT_TRUE(r == CUBEB_OK || r == CUBEB_ERROR_NOT_SUPPORTED);
  if (r == CUBEB_OK) {
    ASSERT_GT(preferred_rate, 0u);
  }

  cubeb_stream_params params = {CUBEB_SAMPLE_FLOAT32NE, preferred_rate,
                                max_channels, CUBEB_LAYOUT_UNDEFINED,
                                CUBEB_STREAM_PREF_NONE};
  r = cubeb_get_min_latency(ctx, &params, &latency_frames);
  ASSERT_TRUE(r == CUBEB_OK || r == CUBEB_ERROR_NOT_SUPPORTED);
  if (r == CUBEB_OK) {
    ASSERT_GT(latency_frames, 0u);
  }
}