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+/*
+ * Copyright (c) 2016, Alliance for Open Media. All rights reserved
+ *
+ * This source code is subject to the terms of the BSD 2 Clause License and
+ * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
+ * was not distributed with this source code in the LICENSE file, you can
+ * obtain it at www.aomedia.org/license/software. If the Alliance for Open
+ * Media Patent License 1.0 was not distributed with this source code in the
+ * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
+ */
+
+#include <math.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "third_party/googletest/src/googletest/include/gtest/gtest.h"
+
+#include "test/acm_random.h"
+#include "aom/aom_integer.h"
+#include "aom_dsp/bitreader.h"
+#include "aom_dsp/bitwriter.h"
+
+using libaom_test::ACMRandom;
+
+namespace {
+const int num_tests = 10;
+} // namespace
+
+TEST(AV1, TestBitIO) {
+ ACMRandom rnd(ACMRandom::DeterministicSeed());
+ for (int n = 0; n < num_tests; ++n) {
+ for (int method = 0; method <= 7; ++method) { // we generate various proba
+ const int kBitsToTest = 1000;
+ uint8_t probas[kBitsToTest];
+
+ for (int i = 0; i < kBitsToTest; ++i) {
+ const int parity = i & 1;
+ /* clang-format off */
+ probas[i] =
+ (method == 0) ? 0 : (method == 1) ? 255 :
+ (method == 2) ? 128 :
+ (method == 3) ? rnd.Rand8() :
+ (method == 4) ? (parity ? 0 : 255) :
+ // alternate between low and high proba:
+ (method == 5) ? (parity ? rnd(128) : 255 - rnd(128)) :
+ (method == 6) ?
+ (parity ? rnd(64) : 255 - rnd(64)) :
+ (parity ? rnd(32) : 255 - rnd(32));
+ /* clang-format on */
+ }
+ for (int bit_method = 0; bit_method <= 3; ++bit_method) {
+ const int random_seed = 6432;
+ const int kBufferSize = 10000;
+ ACMRandom bit_rnd(random_seed);
+ aom_writer bw;
+ uint8_t bw_buffer[kBufferSize];
+ aom_start_encode(&bw, bw_buffer);
+
+ int bit = (bit_method == 0) ? 0 : (bit_method == 1) ? 1 : 0;
+ for (int i = 0; i < kBitsToTest; ++i) {
+ if (bit_method == 2) {
+ bit = (i & 1);
+ } else if (bit_method == 3) {
+ bit = bit_rnd(2);
+ }
+ aom_write(&bw, bit, static_cast<int>(probas[i]));
+ }
+
+ aom_stop_encode(&bw);
+
+ aom_reader br;
+ aom_reader_init(&br, bw_buffer, bw.pos);
+ bit_rnd.Reset(random_seed);
+ for (int i = 0; i < kBitsToTest; ++i) {
+ if (bit_method == 2) {
+ bit = (i & 1);
+ } else if (bit_method == 3) {
+ bit = bit_rnd(2);
+ }
+ GTEST_ASSERT_EQ(aom_read(&br, probas[i], NULL), bit)
+ << "pos: " << i << " / " << kBitsToTest
+ << " bit_method: " << bit_method << " method: " << method;
+ }
+ }
+ }
+ }
+}
+
+#define FRAC_DIFF_TOTAL_ERROR 0.18
+
+TEST(AV1, TestTell) {
+ const int kBufferSize = 10000;
+ aom_writer bw;
+ uint8_t bw_buffer[kBufferSize];
+ const int kSymbols = 1024;
+ // Coders are noisier at low probabilities, so we start at p = 4.
+ for (int p = 4; p < 256; p++) {
+ double probability = p / 256.;
+ aom_start_encode(&bw, bw_buffer);
+ for (int i = 0; i < kSymbols; i++) {
+ aom_write(&bw, 0, p);
+ }
+ aom_stop_encode(&bw);
+ aom_reader br;
+ aom_reader_init(&br, bw_buffer, bw.pos);
+ uint32_t last_tell = aom_reader_tell(&br);
+ uint32_t last_tell_frac = aom_reader_tell_frac(&br);
+ double frac_diff_total = 0;
+ GTEST_ASSERT_GE(aom_reader_tell(&br), 0u);
+ GTEST_ASSERT_LE(aom_reader_tell(&br), 1u);
+ ASSERT_FALSE(aom_reader_has_overflowed(&br));
+ for (int i = 0; i < kSymbols; i++) {
+ aom_read(&br, p, NULL);
+ uint32_t tell = aom_reader_tell(&br);
+ uint32_t tell_frac = aom_reader_tell_frac(&br);
+ GTEST_ASSERT_GE(tell, last_tell)
+ << "tell: " << tell << ", last_tell: " << last_tell;
+ GTEST_ASSERT_GE(tell_frac, last_tell_frac)
+ << "tell_frac: " << tell_frac
+ << ", last_tell_frac: " << last_tell_frac;
+ // Frac tell should round up to tell.
+ GTEST_ASSERT_EQ(tell, (tell_frac + 7) >> 3);
+ last_tell = tell;
+ frac_diff_total +=
+ fabs(((tell_frac - last_tell_frac) / 8.0) + log2(probability));
+ last_tell_frac = tell_frac;
+ }
+ const uint32_t expected = (uint32_t)(-kSymbols * log2(probability));
+ // Last tell should be close to the expected value.
+ GTEST_ASSERT_LE(last_tell, expected + 20) << " last_tell: " << last_tell;
+ // The average frac_diff error should be pretty small.
+ GTEST_ASSERT_LE(frac_diff_total / kSymbols, FRAC_DIFF_TOTAL_ERROR)
+ << " frac_diff_total: " << frac_diff_total;
+ ASSERT_FALSE(aom_reader_has_overflowed(&br));
+ }
+}
+
+TEST(AV1, TestHasOverflowed) {
+ const int kBufferSize = 10000;
+ aom_writer bw;
+ uint8_t bw_buffer[kBufferSize];
+ const int kSymbols = 1024;
+ // Coders are noisier at low probabilities, so we start at p = 4.
+ for (int p = 4; p < 256; p++) {
+ aom_start_encode(&bw, bw_buffer);
+ for (int i = 0; i < kSymbols; i++) {
+ aom_write(&bw, 1, p);
+ }
+ aom_stop_encode(&bw);
+ aom_reader br;
+ aom_reader_init(&br, bw_buffer, bw.pos);
+ ASSERT_FALSE(aom_reader_has_overflowed(&br));
+ for (int i = 0; i < kSymbols; i++) {
+ GTEST_ASSERT_EQ(aom_read(&br, p, NULL), 1);
+ ASSERT_FALSE(aom_reader_has_overflowed(&br));
+ }
+ // In the worst case, the encoder uses just a tiny fraction of the last
+ // byte in the buffer. So to guarantee that aom_reader_has_overflowed()
+ // returns true, we have to consume very nearly 8 additional bits of data.
+ // In the worse case, one of the bits in that byte will be 1, and the rest
+ // will be zero. Once we are past that 1 bit, when the probability of
+ // reading zero symbol from aom_read() is high, each additional symbol read
+ // will consume very little additional data (in the case that p == 255,
+ // approximately -log_2(255/256) ~= 0.0056 bits). In that case it would
+ // take around 178 calls to consume more than 8 bits. That is only an upper
+ // bound. In practice we are not guaranteed to hit the worse case and can
+ // get away with 174 calls.
+ for (int i = 0; i < 174; i++) {
+ aom_read(&br, p, NULL);
+ }
+ ASSERT_TRUE(aom_reader_has_overflowed(&br));
+ }
+}