spek

Acoustic spectrum analyser https://github.com/alexkay/spek spek.cc
git clone http://git.hanabi.in/repos/spek.git
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perf.cc (2132B)

      1 #include <cstdlib>
      2 #include <iostream>
      3 #include <fstream>
      4 
      5 const char *SAMPLE_FILE = SAMPLES_DIR "/perf.wav";
      6 const int SAMPLE_RATE = 44100;
      7 const int SAMPLE_DURATION = 8 * 60; // 8 minutes
      8 const int SAMPLES = SAMPLE_RATE * SAMPLE_DURATION; // per channel
      9 
     10 // Some of the tests will use a sample .wav file which is auto-generated if it doesn't exists.
     11 static void create_samples()
     12 {
     13     if (std::ifstream(SAMPLE_FILE).good()) {
     14         return;
     15     }
     16 
     17     std::ofstream file(SAMPLE_FILE, std::ofstream::binary);
     18     const int data_size = SAMPLES * 2 * 2; // samples * channels * bytes per sample
     19     uint16_t u16;
     20     uint32_t u32;
     21     file.write("RIFF", 4);
     22     file.write(reinterpret_cast<const char*>(&(u32 = 36 + data_size)), 4); // size
     23     file.write("WAVE", 4);
     24     file.write("fmt ", 4);
     25     file.write(reinterpret_cast<const char*>(&(u32 = 16)), 4); // subchunk size
     26     file.write(reinterpret_cast<const char*>(&(u16 = 1)), 2); // 1 = PCM
     27     file.write(reinterpret_cast<const char*>(&(u16 = 2)), 2); // 2 = stereo
     28     file.write(reinterpret_cast<const char*>(&(u32 = SAMPLE_RATE)), 4);
     29     file.write(reinterpret_cast<const char*>(&(u32 = SAMPLE_RATE * 2 * 2)), 4); // byte rate
     30     file.write(reinterpret_cast<const char*>(&(u16 = 2 * 2)), 2); // block align
     31     file.write(reinterpret_cast<const char*>(&(u16 = 16)), 2); // bits per sample
     32     file.write("data", 4);
     33     file.write(reinterpret_cast<const char*>(&(u32 = data_size)), 4);
     34 
     35     // Fill in both channels with pseudo-random values.
     36     srand(93);
     37     for (int i = 0; i < SAMPLES * 2; ++i) {
     38         file.write(reinterpret_cast<const char*>(&(u16 = rand())), 2);
     39     }
     40 }
     41 
     42 // Reading and decoding an audio file.
     43 static void perf_decoder()
     44 {
     45 }
     46 
     47 // Running FFTs and processing the results.
     48 static void perf_worker()
     49 {
     50 }
     51 
     52 // Managing worker and decoder threads (in isolation from the actual decoder and worker).
     53 static void perf_pipeline()
     54 {
     55 }
     56 
     57 // Testing it all together.
     58 static void perf_all()
     59 {
     60 }
     61 
     62 // Performance regression tests.
     63 int main()
     64 {
     65     create_samples();
     66 
     67     perf_decoder();
     68     perf_worker();
     69     perf_pipeline();
     70     perf_all();
     71 
     72     return 0;
     73 }