Add systematic integration test for cubeb_resampler, with typical blo…

…ck sizes and sample-rates

This might be a bit much, runtime is 25s debug ASAN, 6s opt, but should
be thorough.

test/test_resampler.cpp

@@ -6,7 +6,12 @@
  */
 #ifndef NOMINMAX
 #define NOMINMAX
+#include "cubeb/cubeb.h"
+#include "cubeb_log.h"
+#include "cubeb_resampler.h"
 #endif // NOMINMAX
+// #define ENABLE_NORMAL_LOG
+// #define ENABLE_VERBOSE_LOG
 #include "common.h"
 #include "cubeb_resampler_internal.h"
 #include "gtest/gtest.h"
@@ -1160,5 +1165,61 @@ TEST(cubeb, individual_methods)
   ASSERT_EQ(frames_needed2, 0u);
 }
 
+long
+data_cb(cubeb_stream * stream, void * user_ptr, void const * input_buffer,
+        void * output_buffer, long nframes)
+{
+  LOGV("%ld frames requested\n", nframes);
+  float * out = static_cast<float *>(output_buffer);
+  // never drain, fill with silence
+  for (int i = 0; i < nframes * 2; i++) {
+    out[i] = 0.0;
+  }
+  return nframes;
+}
+
+TEST(cubeb, resampler_typical_uses)
+{
+  // Source and target sample-rates in Hz, typical values.
+  const int rates[] = {16000, 32000, 44100, 48000, 96000, 192000, 384000};
+  // Block size in frames, except the first element, that is in millisecond
+  // Power of two are typical on Windows WASAPI IAudioClient3, macOS,
+  // Linux Pipewire and Jack. 10ms is typical on Windows IAudioClient and
+  // IAudioClient2. 96, 192 are not uncommon on some Android devices.
+  const int block_sizes[] = {10, 96, 128, 192, 256, 512, 1024, 2048};
+  cubeb * ctx;
+  common_init(&ctx, "Cubeb resampler test");
+  for (int source_rate : rates) {
+    for (int target_rate : rates) {
+      for (int block_size : block_sizes) {
+        // special case: Windows/WASAPI works in blocks of 10ms
+        if (block_size == 10) {
+          block_size = target_rate / 100;
+        }
+        cubeb_stream_params out_params = {};
+        out_params.channels = 2;
+        out_params.rate = target_rate;
+        out_params.format = CUBEB_SAMPLE_FLOAT32NE;
+
+        cubeb_resampler * resampler = cubeb_resampler_create(
+            nullptr, nullptr, &out_params, source_rate, data_cb, nullptr,
+            CUBEB_RESAMPLER_QUALITY_DEFAULT, CUBEB_RESAMPLER_RECLOCK_NONE);
+        ASSERT_NE(resampler, nullptr);
+
+        std::vector<float> data(block_size * out_params.channels);
+        int i = 100;
+        while (i--) {
+          long got = cubeb_resampler_fill(resampler, nullptr, 0, data.data(),
+                                          block_size);
+          ASSERT_EQ(got, block_size);
+        }
+
+        cubeb_resampler_destroy(resampler);
+      }
+    }
+  }
+  cubeb_destroy(ctx);
+}
+
 #undef NOMINMAX
 #undef DUMP_ARRAYS