1 /*
2 * Copyright (c) 2012 The WebM project authors. All Rights Reserved.
3 *
4 * Use of this source code is governed by a BSD-style license
5 * that can be found in the LICENSE file in the root of the source
6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree.
9 */
10
11 #include <math.h>
12 #include <stdlib.h>
13 #include <string.h>
14
15 #include "third_party/googletest/src/include/gtest/gtest.h"
16
17 #include "test/acm_random.h"
18 #include "vpx/vpx_integer.h"
19 #include "vpx_dsp/bitreader.h"
20 #include "vpx_dsp/bitwriter.h"
21
22 using libvpx_test::ACMRandom;
23
24 namespace {
25 const int num_tests = 10;
26 } // namespace
27
TEST(VP9,TestBitIO)28 TEST(VP9, TestBitIO) {
29 ACMRandom rnd(ACMRandom::DeterministicSeed());
30 for (int n = 0; n < num_tests; ++n) {
31 for (int method = 0; method <= 7; ++method) { // we generate various proba
32 const int kBitsToTest = 1000;
33 uint8_t probas[kBitsToTest];
34
35 for (int i = 0; i < kBitsToTest; ++i) {
36 const int parity = i & 1;
37 /* clang-format off */
38 probas[i] =
39 (method == 0) ? 0 : (method == 1) ? 255 :
40 (method == 2) ? 128 :
41 (method == 3) ? rnd.Rand8() :
42 (method == 4) ? (parity ? 0 : 255) :
43 // alternate between low and high proba:
44 (method == 5) ? (parity ? rnd(128) : 255 - rnd(128)) :
45 (method == 6) ?
46 (parity ? rnd(64) : 255 - rnd(64)) :
47 (parity ? rnd(32) : 255 - rnd(32));
48 /* clang-format on */
49 }
50 for (int bit_method = 0; bit_method <= 3; ++bit_method) {
51 const int random_seed = 6432;
52 const int kBufferSize = 10000;
53 ACMRandom bit_rnd(random_seed);
54 vpx_writer bw;
55 uint8_t bw_buffer[kBufferSize];
56 vpx_start_encode(&bw, bw_buffer);
57
58 int bit = (bit_method == 0) ? 0 : (bit_method == 1) ? 1 : 0;
59 for (int i = 0; i < kBitsToTest; ++i) {
60 if (bit_method == 2) {
61 bit = (i & 1);
62 } else if (bit_method == 3) {
63 bit = bit_rnd(2);
64 }
65 vpx_write(&bw, bit, static_cast<int>(probas[i]));
66 }
67
68 vpx_stop_encode(&bw);
69
70 // First bit should be zero
71 GTEST_ASSERT_EQ(bw_buffer[0] & 0x80, 0);
72
73 vpx_reader br;
74 vpx_reader_init(&br, bw_buffer, kBufferSize, NULL, NULL);
75 bit_rnd.Reset(random_seed);
76 for (int i = 0; i < kBitsToTest; ++i) {
77 if (bit_method == 2) {
78 bit = (i & 1);
79 } else if (bit_method == 3) {
80 bit = bit_rnd(2);
81 }
82 GTEST_ASSERT_EQ(vpx_read(&br, probas[i]), bit)
83 << "pos: " << i << " / " << kBitsToTest
84 << " bit_method: " << bit_method << " method: " << method;
85 }
86 }
87 }
88 }
89 }
90