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 * Unless required by applicable law or agreed to in writing, software
10 *
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 <cstdio>
18 #include <memory>
19
20 #include <stdlib.h>
21
22 #include <audio_utils/BiquadFilter.h>
23 #include <audio_utils/channels.h>
24 #include <audio_utils/primitives.h>
25
26 using namespace android::audio_utils;
27
28 // Random a coefficients here for the test.
29 static constexpr std::array<float, kBiquadNumCoefs> biquadCoefs = {
30 0.983097f, -1.966194f, 0.983097f, -1.988931f, 0.988992f};
31
printUsage()32 void printUsage() {
33 printf("\nUsage:");
34 printf("\n <executable> -ch:<process_channels> -fch:<file_channels> "
35 "<input_file> <out_file>");
36 printf("\nwhere,\n <process_channels> (1 through 8) default 2");
37 printf("\n <file_channels> (1 through 8) default 2\n");
38 printf("\n <inputfile> is the input file name");
39 printf("\n on which filtering is applied");
40 printf("\n <outputfile> processed output file\n");
41
42 }
43
main(int argc,const char * argv[])44 int main(int argc, const char *argv[]) {
45
46 if (argc < 3) {
47 printUsage();
48 return EXIT_FAILURE;
49 }
50
51 int fileChannelCount = 2;
52 int procChannelCount = 2;
53
54 if (argc < 3) {
55 printf("Error: missing input/output files\n");
56 printUsage();
57 return EXIT_FAILURE;
58 }
59
60 const char *infile = argv[argc - 2];
61 const char *outfile = argv[argc - 1];
62
63 if (infile == nullptr || outfile == nullptr) {
64 printf("Error: missing input/output files\n");
65 printUsage();
66 return EXIT_FAILURE;
67 }
68
69 printf("%s ", infile);
70 printf("%s ", outfile);
71
72 for (int i = 1; i < argc - 2; i++) {
73 printf("%s ", argv[i]);
74 if (!strncmp(argv[i], "-ch:", 4)) {
75 procChannelCount = atoi(argv[i] + 4);
76 if (procChannelCount < 1 || procChannelCount > 8) {
77 printf("\nNumber of channels to process exceeds limit\n");
78 return EXIT_FAILURE;
79 }
80 } else if (!strncmp(argv[i], "-fch:", 5)) {
81 fileChannelCount = atoi(argv[i] + 5);
82 if (fileChannelCount < 1 || fileChannelCount > 8) {
83 printf("\nNumber of channels in the file exceeds limit\n");
84 return EXIT_FAILURE;
85 }
86 }
87 }
88
89 std::unique_ptr<std::FILE, decltype(&std::fclose)> finp(
90 std::fopen(infile, "rb"), &std::fclose);
91 if (finp == nullptr) {
92 printf("Cannot open input file %s\n", infile);
93 return EXIT_FAILURE;
94 }
95
96 std::unique_ptr<std::FILE, decltype(&std::fclose)> fout(
97 std::fopen(outfile, "wb"), &std::fclose);
98 if (fout == nullptr) {
99 printf("Cannot open output file %s\n", outfile);
100 fclose(finp.get());
101 return EXIT_FAILURE;
102 }
103
104 const size_t frameLength = 256;
105 const int maxChannelCount = std::max(fileChannelCount, procChannelCount);
106
107 std::vector<short> in(frameLength * maxChannelCount);
108 std::vector<short> out(frameLength * maxChannelCount);
109 std::vector<float> floatIn(frameLength * procChannelCount);
110 std::vector<float> floatOut(frameLength * procChannelCount);
111 const size_t ioFrameSize = fileChannelCount * sizeof(short);
112
113 BiquadFilter biquadFilter(procChannelCount);
114 biquadFilter.clear();
115 biquadFilter.setCoefficients(biquadCoefs);
116
117 size_t frameCounter = 0;
118
119 while (fread(in.data(), ioFrameSize, frameLength, finp.get()) ==
120 frameLength) {
121 if (fileChannelCount != procChannelCount) {
122 adjust_channels(in.data(), fileChannelCount, in.data(),
123 procChannelCount, sizeof(short),
124 frameLength * ioFrameSize);
125 }
126 memcpy_to_float_from_i16(floatIn.data(), in.data(),
127 frameLength * procChannelCount);
128
129 biquadFilter.process(floatOut.data(), floatIn.data(), frameLength);
130
131 memcpy_to_i16_from_float(out.data(), floatOut.data(),
132 frameLength * procChannelCount);
133 frameCounter += frameLength;
134 adjust_channels(out.data(), procChannelCount, out.data(),
135 fileChannelCount, sizeof(short),
136 frameLength * procChannelCount * sizeof(short));
137 fwrite(out.data(), ioFrameSize, frameLength, fout.get());
138 }
139 printf("frameCounter: [%zu]\n", frameCounter);
140
141 return EXIT_SUCCESS;
142 }
143