1 /*
2 * Copyright (C) 2020 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include <array>
18 #include <climits>
19 #include <math.h>
20 #include <memory>
21 #include <string.h>
22
23 #include <gtest/gtest.h>
24
25 #include <audio_utils/spdif/SPDIFEncoder.h>
26
27 using namespace android;
28
29 class MySPDIFEncoder : public SPDIFEncoder {
30 public:
31
MySPDIFEncoder(audio_format_t format)32 explicit MySPDIFEncoder(audio_format_t format)
33 : SPDIFEncoder(format)
34 {
35 }
36 // Defaults to AC3 format. Was in original API.
37 MySPDIFEncoder() = default;
38
writeOutput(const void *,size_t numBytes)39 ssize_t writeOutput( const void* /* buffer */, size_t numBytes ) override {
40 mOutputSizeBytes = numBytes;
41 return numBytes;
42 }
43
getFramer() const44 FrameScanner *getFramer() const { return mFramer; }
getByteCursor() const45 size_t getByteCursor() const { return mByteCursor; }
getPayloadBytesPending() const46 size_t getPayloadBytesPending() const { return mPayloadBytesPending; }
getBurstBufferSizeBytes() const47 size_t getBurstBufferSizeBytes() const { return mBurstBufferSizeBytes; }
48
49 size_t mOutputSizeBytes = 0;
50 };
51
52 // This is the beginning of the file voice1-48k-64kbps-15s.ac3
53 static const uint8_t sVoice1ch48k_AC3[] = {
54 0x0b, 0x77, 0x44, 0xcd, 0x08, 0x40, 0x2f, 0x84, 0x29, 0xca, 0x6e, 0x44, 0xa4, 0xfd, 0xce, 0xf7,
55 0xc9, 0x9f, 0x3e, 0x74, 0xfa, 0x01, 0x0a, 0xda, 0xb3, 0x3e, 0xb0, 0x95, 0xf2, 0x5a, 0xef, 0x9e
56 };
57
58 // This is the beginning of the file channelcheck_48k6ch.eac3
59 static const uint8_t sChannel6ch48k_EAC3[] = {
60 0x0b, 0x77, 0x01, 0xbf, 0x3f, 0x85, 0x7f, 0xe8, 0x1e, 0x40, 0x82, 0x10, 0x00, 0x00, 0x00, 0x01,
61 0x00, 0x00, 0x00, 0x03, 0xfc, 0x60, 0x80, 0x7e, 0x59, 0x00, 0xfc, 0xf3, 0xcf, 0x01, 0xf9, 0xe7
62 };
63
64 static const uint8_t sZeros[32] = { 0 };
65
66 static constexpr int kBytesPerOutputFrame = 2 * sizeof(int16_t); // stereo
67
TEST(audio_utils_spdif,SupportedFormats)68 TEST(audio_utils_spdif, SupportedFormats)
69 {
70 ASSERT_FALSE(SPDIFEncoder::isFormatSupported(AUDIO_FORMAT_PCM_FLOAT));
71 ASSERT_FALSE(SPDIFEncoder::isFormatSupported(AUDIO_FORMAT_PCM_16_BIT));
72 ASSERT_FALSE(SPDIFEncoder::isFormatSupported(AUDIO_FORMAT_MP3));
73
74 ASSERT_TRUE(SPDIFEncoder::isFormatSupported(AUDIO_FORMAT_AC3));
75 ASSERT_TRUE(SPDIFEncoder::isFormatSupported(AUDIO_FORMAT_E_AC3));
76 ASSERT_TRUE(SPDIFEncoder::isFormatSupported(AUDIO_FORMAT_DTS));
77 ASSERT_TRUE(SPDIFEncoder::isFormatSupported(AUDIO_FORMAT_DTS_HD));
78 }
79
TEST(audio_utils_spdif,ScanAC3)80 TEST(audio_utils_spdif, ScanAC3)
81 {
82 MySPDIFEncoder encoder(AUDIO_FORMAT_AC3);
83 FrameScanner *scanner = encoder.getFramer();
84 // It should recognize the valid AC3 header.
85 int i = 0;
86 while (i < 5) {
87 ASSERT_FALSE(scanner->scan(sVoice1ch48k_AC3[i++]));
88 }
89 ASSERT_TRUE(scanner->scan(sVoice1ch48k_AC3[i++]));
90 ASSERT_FALSE(scanner->scan(sVoice1ch48k_AC3[i++]));
91 }
92
TEST(audio_utils_spdif,WriteAC3)93 TEST(audio_utils_spdif, WriteAC3)
94 {
95 MySPDIFEncoder encoder(AUDIO_FORMAT_AC3);
96 encoder.write(sVoice1ch48k_AC3, sizeof(sVoice1ch48k_AC3));
97 ASSERT_EQ(48000, encoder.getFramer()->getSampleRate());
98 ASSERT_EQ(kBytesPerOutputFrame, encoder.getBytesPerOutputFrame());
99 ASSERT_EQ(1, encoder.getRateMultiplier());
100
101 // Check to make sure that the pending bytes calculation did not overflow.
102 size_t burstBufferSizeBytes = encoder.getBurstBufferSizeBytes(); // allocated maximum size
103 size_t pendingBytes = encoder.getPayloadBytesPending();
104 ASSERT_GE(burstBufferSizeBytes, pendingBytes);
105
106 // Write some fake compressed audio to force an output data burst.
107 for (int i = 0; i < 7; i++) {
108 auto result = encoder.write(sZeros, sizeof(sZeros));
109 ASSERT_EQ(sizeof(sZeros), result);
110 }
111 // This value is calculated in SPDIFEncoder::sendZeroPad()
112 // size_t burstSize = mFramer->getSampleFramesPerSyncFrame() * sizeof(uint16_t)
113 // * SPDIF_ENCODED_CHANNEL_COUNT;
114 // If it changes then there is probably a regression.
115 const int kExpectedBurstSize = 6144;
116 ASSERT_EQ(kExpectedBurstSize, encoder.mOutputSizeBytes);
117 }
118
TEST(audio_utils_spdif,ValidEAC3)119 TEST(audio_utils_spdif, ValidEAC3)
120 {
121 MySPDIFEncoder encoder(AUDIO_FORMAT_E_AC3);
122 auto result = encoder.write(sChannel6ch48k_EAC3, sizeof(sChannel6ch48k_EAC3));
123 ASSERT_EQ(sizeof(sChannel6ch48k_EAC3), result);
124 ASSERT_EQ(4, encoder.getRateMultiplier()); // EAC3_RATE_MULTIPLIER
125 ASSERT_EQ(48000, encoder.getFramer()->getSampleRate());
126 ASSERT_EQ(kBytesPerOutputFrame, encoder.getBytesPerOutputFrame());
127
128 // Check to make sure that the pending bytes calculation did not overflow.
129 size_t bufferSize = encoder.getBurstBufferSizeBytes();
130 size_t pendingBytes = encoder.getPayloadBytesPending();
131 ASSERT_GE(bufferSize, pendingBytes);
132 }
133
TEST(audio_utils_spdif,InvalidLengthEAC3)134 TEST(audio_utils_spdif, InvalidLengthEAC3)
135 {
136 MySPDIFEncoder encoder(AUDIO_FORMAT_E_AC3);
137 // Mangle a valid header and try to force a numeric overflow.
138 uint8_t mangled[sizeof(sChannel6ch48k_EAC3)] = {0};
139 memcpy(mangled, sChannel6ch48k_EAC3, sizeof(sChannel6ch48k_EAC3));
140
141 // force frmsiz to zero!
142 mangled[2] = mangled[2] & 0xF8;
143 mangled[3] = 0;
144 auto result = encoder.write(mangled, sizeof(mangled));
145 ASSERT_EQ(sizeof(mangled), result);
146
147 // Check to make sure that the pending bytes calculation did not overflow.
148 size_t bufferSize = encoder.getBurstBufferSizeBytes();
149 size_t pendingBytes = encoder.getPayloadBytesPending();
150 ASSERT_GE(bufferSize, pendingBytes);
151
152 }
153