--- /dev/null
+// Rather simplistic benchmark of AudioMixer. Sets up a simple mapping
+// with the default settings, feeds some white noise to the inputs and
+// runs a while. Useful for e.g. profiling.
+
+#include <assert.h>
+#include <bmusb/bmusb.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <algorithm>
+#include <chrono>
+#include <cmath>
+#include <ratio>
+#include <vector>
+
+#include "audio_mixer.h"
+#include "db.h"
+#include "defs.h"
+#include "input_mapping.h"
+#include "resampling_queue.h"
+#include "timebase.h"
+
+#define NUM_BENCHMARK_CARDS 4
+#define NUM_WARMUP_FRAMES 100
+#define NUM_BENCHMARK_FRAMES 1000
+#define NUM_TEST_FRAMES 10
+#define NUM_CHANNELS 8
+#define NUM_SAMPLES 1024
+
+using namespace std;
+using namespace std::chrono;
+
+// 16-bit samples, white noise at full volume.
+uint8_t samples16[(NUM_SAMPLES * NUM_CHANNELS + 1024) * sizeof(uint16_t)];
+
+// 24-bit samples, white noise at low volume (-48 dB).
+uint8_t samples24[(NUM_SAMPLES * NUM_CHANNELS + 1024) * 3];
+
+static uint32_t seed = 1234;
+
+// We use our own instead of rand() to get deterministic behavior.
+// Quality doesn't really matter much.
+uint32_t lcgrand()
+{
+ seed = seed * 1103515245u + 12345u;
+ return seed;
+}
+
+void reset_lcgrand()
+{
+ seed = 1234;
+}
+
+void callback(float level_lufs, float peak_db,
+ std::vector<AudioMixer::BusLevel> bus_levels,
+ float global_level_lufs, float range_low_lufs, float range_high_lufs,
+ float final_makeup_gain_db,
+ float correlation)
+{
+ // Empty.
+}
+
+vector<float> process_frame(unsigned frame_num, AudioMixer *mixer)
+{
+ duration<int64_t, ratio<NUM_SAMPLES, OUTPUT_FREQUENCY>> frame_duration(frame_num);
+ steady_clock::time_point ts = steady_clock::time_point(duration_cast<steady_clock::duration>(frame_duration));
+
+ // Feed the inputs.
+ for (unsigned card_index = 0; card_index < NUM_BENCHMARK_CARDS; ++card_index) {
+ bmusb::AudioFormat audio_format;
+ audio_format.bits_per_sample = card_index == 3 ? 24 : 16;
+ audio_format.num_channels = NUM_CHANNELS;
+
+ unsigned num_samples = NUM_SAMPLES + (lcgrand() % 9) - 5;
+ bool ok = mixer->add_audio(DeviceSpec{InputSourceType::CAPTURE_CARD, card_index},
+ card_index == 3 ? samples24 : samples16, num_samples, audio_format,
+ NUM_SAMPLES * TIMEBASE / OUTPUT_FREQUENCY, ts);
+ assert(ok);
+ }
+
+ return mixer->get_output(ts, NUM_SAMPLES, ResamplingQueue::ADJUST_RATE);
+}
+
+void init_mapping(AudioMixer *mixer)
+{
+ InputMapping mapping;
+
+ InputMapping::Bus bus1;
+ bus1.device = DeviceSpec{InputSourceType::CAPTURE_CARD, 0};
+ bus1.source_channel[0] = 0;
+ bus1.source_channel[1] = 1;
+ mapping.buses.push_back(bus1);
+
+ InputMapping::Bus bus2;
+ bus2.device = DeviceSpec{InputSourceType::CAPTURE_CARD, 3};
+ bus2.source_channel[0] = 6;
+ bus2.source_channel[1] = 4;
+ mapping.buses.push_back(bus2);
+
+ mixer->set_input_mapping(mapping);
+}
+
+void do_test(const char *filename)
+{
+ AudioMixer mixer(NUM_BENCHMARK_CARDS, 0);
+ mixer.set_audio_level_callback(callback);
+ init_mapping(&mixer);
+
+ reset_lcgrand();
+
+ vector<float> output;
+ for (unsigned i = 0; i < NUM_TEST_FRAMES; ++i) {
+ vector<float> frame_output = process_frame(i, &mixer);
+ output.insert(output.end(), frame_output.begin(), frame_output.end());
+ }
+
+ FILE *fp = fopen(filename, "rb");
+ if (fp == nullptr) {
+ fprintf(stderr, "%s not found, writing new reference.\n", filename);
+ fp = fopen(filename, "wb");
+ fwrite(&output[0], output.size() * sizeof(float), 1, fp);
+ fclose(fp);
+ return;
+ }
+
+ vector<float> ref;
+ ref.resize(output.size());
+ fread(&ref[0], output.size() * sizeof(float), 1, fp);
+ fclose(fp);
+
+ float max_err = 0.0f, sum_sq_err = 0.0f;
+ for (unsigned i = 0; i < output.size(); ++i) {
+ float err = output[i] - ref[i];
+ max_err = max(max_err, fabs(err));
+ sum_sq_err += err * err;
+ }
+
+ printf("Largest error: %.6f (%+.1f dB)\n", max_err, to_db(max_err));
+ printf("RMS error: %+.1f dB\n", to_db(sqrt(sum_sq_err) / output.size()));
+}
+
+void do_benchmark()
+{
+ AudioMixer mixer(NUM_BENCHMARK_CARDS, 0);
+ mixer.set_audio_level_callback(callback);
+ init_mapping(&mixer);
+
+ size_t out_samples = 0;
+
+ reset_lcgrand();
+
+ steady_clock::time_point start, end;
+ for (unsigned i = 0; i < NUM_WARMUP_FRAMES + NUM_BENCHMARK_FRAMES; ++i) {
+ if (i == NUM_WARMUP_FRAMES) {
+ start = steady_clock::now();
+ }
+ vector<float> output = process_frame(i, &mixer);
+ if (i >= NUM_WARMUP_FRAMES) {
+ out_samples += output.size();
+ }
+ }
+ end = steady_clock::now();
+
+ double elapsed = duration<double>(end - start).count();
+ double simulated = double(out_samples) / (OUTPUT_FREQUENCY * 2);
+ printf("%ld samples produced in %.1f ms (%.1f%% CPU, %.1fx realtime).\n",
+ out_samples, elapsed * 1e3, 100.0 * elapsed / simulated, simulated / elapsed);
+}
+
+int main(int argc, char **argv)
+{
+ for (unsigned i = 0; i < NUM_SAMPLES * NUM_CHANNELS + 1024; ++i) {
+ samples16[i * 2] = lcgrand() & 0xff;
+ samples16[i * 2 + 1] = lcgrand() & 0xff;
+
+ samples24[i * 3] = lcgrand() & 0xff;
+ samples24[i * 3 + 1] = lcgrand() & 0xff;
+ samples24[i * 3 + 2] = 0;
+ }
+
+ if (argc == 2) {
+ do_test(argv[1]);
+ }
+ do_benchmark();
+}
+
projects / nageru / blobdiff