1 // Rather simplistic benchmark of AudioMixer. Sets up a simple mapping
2 // with the default settings, feeds some white noise to the inputs and
3 // runs a while. Useful for e.g. profiling.
9 #include "audio_mixer.h"
12 #define NUM_BENCHMARK_CARDS 4
13 #define NUM_WARMUP_FRAMES 100
14 #define NUM_BENCHMARK_FRAMES 1000
15 #define NUM_CHANNELS 8
16 #define NUM_SAMPLES 1024
19 using namespace std::chrono;
21 uint8_t samples[(NUM_SAMPLES * NUM_CHANNELS + 1024) * sizeof(uint16_t)];
23 void callback(float level_lufs, float peak_db,
24 std::vector<AudioMixer::BusLevel> bus_levels,
25 float global_level_lufs, float range_low_lufs, float range_high_lufs,
26 float final_makeup_gain_db,
34 for (unsigned i = 0; i < NUM_SAMPLES * NUM_CHANNELS + 1024; ++i) {
35 samples[i] = rand() & 0xff;
37 AudioMixer mixer(NUM_BENCHMARK_CARDS);
38 mixer.set_audio_level_callback(callback);
42 InputMapping::Bus bus1;
43 bus1.device = DeviceSpec{InputSourceType::CAPTURE_CARD, 0};
44 bus1.source_channel[0] = 0;
45 bus1.source_channel[1] = 1;
46 mapping.buses.push_back(bus1);
48 InputMapping::Bus bus2;
49 bus2.device = DeviceSpec{InputSourceType::CAPTURE_CARD, 3};
50 bus2.source_channel[0] = 6;
51 bus2.source_channel[1] = 4;
52 mapping.buses.push_back(bus2);
54 mixer.set_input_mapping(mapping);
56 size_t out_samples = 0;
58 steady_clock::time_point start, end;
59 for (unsigned i = 0; i < NUM_WARMUP_FRAMES + NUM_BENCHMARK_FRAMES; ++i) {
60 if (i == NUM_WARMUP_FRAMES) {
61 start = steady_clock::now();
64 for (unsigned card_index = 0; card_index < NUM_BENCHMARK_CARDS; ++card_index) {
65 bmusb::AudioFormat audio_format;
66 audio_format.bits_per_sample = 16;
67 audio_format.num_channels = NUM_CHANNELS;
69 unsigned num_samples = NUM_SAMPLES + (rand() % 9) - 5;
70 bool ok = mixer.add_audio(DeviceSpec{InputSourceType::CAPTURE_CARD, card_index}, samples, num_samples, audio_format, NUM_SAMPLES * TIMEBASE / OUTPUT_FREQUENCY);
74 double pts = double(i) * NUM_SAMPLES / OUTPUT_FREQUENCY;
75 vector<float> output = mixer.get_output(pts, NUM_SAMPLES, ResamplingQueue::ADJUST_RATE);
76 if (i >= NUM_WARMUP_FRAMES) {
77 out_samples += output.size();
80 end = steady_clock::now();
82 double elapsed = duration<double>(end - start).count();
83 double simulated = double(out_samples) / (OUTPUT_FREQUENCY * 2);
84 printf("%ld samples produced in %.1f ms (%.1f%% CPU, %.1fx realtime).\n",
85 out_samples, elapsed * 1e3, 100.0 * elapsed / simulated, simulated / elapsed);