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 "vp9/decoder/vp9_reader.h" 18 #include "vp9/encoder/vp9_writer.h" 19 20 #include "test/acm_random.h" 21 #include "vpx/vpx_integer.h" 22 23 using libvpx_test::ACMRandom; 24 25 namespace { 26 const int num_tests = 10; 27 } // namespace 28 29 TEST(VP9, TestBitIO) { 30 ACMRandom rnd(ACMRandom::DeterministicSeed()); 31 for (int n = 0; n < num_tests; ++n) { 32 for (int method = 0; method <= 7; ++method) { // we generate various proba 33 const int kBitsToTest = 1000; 34 uint8_t probas[kBitsToTest]; 35 36 for (int i = 0; i < kBitsToTest; ++i) { 37 const int parity = i & 1; 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 } 49 for (int bit_method = 0; bit_method <= 3; ++bit_method) { 50 const int random_seed = 6432; 51 const int kBufferSize = 10000; 52 ACMRandom bit_rnd(random_seed); 53 vp9_writer bw; 54 uint8_t bw_buffer[kBufferSize]; 55 vp9_start_encode(&bw, bw_buffer); 56 57 int bit = (bit_method == 0) ? 0 : (bit_method == 1) ? 1 : 0; 58 for (int i = 0; i < kBitsToTest; ++i) { 59 if (bit_method == 2) { 60 bit = (i & 1); 61 } else if (bit_method == 3) { 62 bit = bit_rnd(2); 63 } 64 vp9_write(&bw, bit, static_cast<int>(probas[i])); 65 } 66 67 vp9_stop_encode(&bw); 68 69 // First bit should be zero 70 GTEST_ASSERT_EQ(bw_buffer[0] & 0x80, 0); 71 72 vp9_reader br; 73 vp9_reader_init(&br, bw_buffer, kBufferSize); 74 bit_rnd.Reset(random_seed); 75 for (int i = 0; i < kBitsToTest; ++i) { 76 if (bit_method == 2) { 77 bit = (i & 1); 78 } else if (bit_method == 3) { 79 bit = bit_rnd(2); 80 } 81 GTEST_ASSERT_EQ(vp9_read(&br, probas[i]), bit) 82 << "pos: " << i << " / " << kBitsToTest 83 << " bit_method: " << bit_method 84 << " method: " << method; 85 } 86 } 87 } 88 } 89 } 90
