Initial sketch of bdp estimator
diff --git a/src/core/lib/transport/bdp_estimator.c b/src/core/lib/transport/bdp_estimator.c
new file mode 100644
index 0000000..038054d
--- /dev/null
+++ b/src/core/lib/transport/bdp_estimator.c
@@ -0,0 +1,65 @@
+/*
+ *
+ * Copyright 2016, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include "src/core/lib/transport/bdp_estimator.h"
+
+#include <grpc/support/useful.h>
+
+void grpc_bdp_estimator_init(grpc_bdp_estimator *estimator) {
+ estimator->num_samples = 0;
+ estimator->first_sample_idx = 0;
+ estimator->sampling = false;
+}
+
+static int compare_samples(const void *a, const void *b) {
+ return GPR_ICMP(*(int64_t *)a, *(int64_t *)b);
+}
+
+bool grpc_bdp_estimator_get_estimate(grpc_bdp_estimator *estimator,
+ int64_t *estimate) {
+ if (estimator->num_samples < GRPC_BDP_MIN_SAMPLES_FOR_ESTIMATE) {
+ return false;
+ }
+
+ int64_t samples[GRPC_BDP_SAMPLES];
+ for (uint8_t i = 0; i < estimator->num_samples; i++) {
+ samples[i] =
+ estimator
+ ->samples[(estimator->first_sample_idx + i) % GRPC_BDP_SAMPLES];
+ }
+ qsort(samples, estimator->num_samples, sizeof(*samples), compare_samples);
+
+ if (estimator->num_samples & 1) {
+ } else {
+ }
+}