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 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
