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gecko-dev/media/libcubeb/gtest/test_resampler.cpp

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C++
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/*
* Copyright © 2016 Mozilla Foundation
*
* This program is made available under an ISC-style license. See the
* accompanying file LICENSE for details.
*/
#ifndef NOMINMAX
#define NOMINMAX
#endif // NOMINMAX
#include "gtest/gtest.h"
#include "common.h"
#include "cubeb_resampler_internal.h"
#include <stdio.h>
#include <algorithm>
#include <iostream>
/* Windows cmath USE_MATH_DEFINE thing... */
const float PI = 3.14159265359f;
/* Testing all sample rates is very long, so if THOROUGH_TESTING is not defined,
* only part of the test suite is ran. */
#ifdef THOROUGH_TESTING
/* Some standard sample rates we're testing with. */
const uint32_t sample_rates[] = {
8000,
16000,
32000,
44100,
48000,
88200,
96000,
192000
};
/* The maximum number of channels we're resampling. */
const uint32_t max_channels = 2;
/* The minimum an maximum number of milliseconds we're resampling for. This is
* used to simulate the fact that the audio stream is resampled in chunks,
* because audio is delivered using callbacks. */
const uint32_t min_chunks = 10; /* ms */
const uint32_t max_chunks = 30; /* ms */
const uint32_t chunk_increment = 1;
#else
const uint32_t sample_rates[] = {
8000,
44100,
48000,
};
const uint32_t max_channels = 2;
const uint32_t min_chunks = 10; /* ms */
const uint32_t max_chunks = 30; /* ms */
const uint32_t chunk_increment = 10;
#endif
#define DUMP_ARRAYS
#ifdef DUMP_ARRAYS
/**
* Files produced by dump(...) can be converted to .wave files using:
*
* sox -c <channel_count> -r <rate> -e float -b 32 file.raw file.wav
*
* for floating-point audio, or:
*
* sox -c <channel_count> -r <rate> -e unsigned -b 16 file.raw file.wav
*
* for 16bit integer audio.
*/
/* Use the correct implementation of fopen, depending on the platform. */
void fopen_portable(FILE ** f, const char * name, const char * mode)
{
#ifdef WIN32
fopen_s(f, name, mode);
#else
*f = fopen(name, mode);
#endif
}
template<typename T>
void dump(const char * name, T * frames, size_t count)
{
FILE * file;
fopen_portable(&file, name, "wb");
if (!file) {
fprintf(stderr, "error opening %s\n", name);
return;
}
if (count != fwrite(frames, sizeof(T), count, file)) {
fprintf(stderr, "error writing to %s\n", name);
}
fclose(file);
}
#else
template<typename T>
void dump(const char * name, T * frames, size_t count)
{ }
#endif
// The more the ratio is far from 1, the more we accept a big error.
float epsilon_tweak_ratio(float ratio)
{
return ratio >= 1 ? ratio : 1 / ratio;
}
// Epsilon values for comparing resampled data to expected data.
// The bigger the resampling ratio is, the more lax we are about errors.
template<typename T>
T epsilon(float ratio);
template<>
float epsilon(float ratio) {
return 0.08f * epsilon_tweak_ratio(ratio);
}
template<>
int16_t epsilon(float ratio) {
return static_cast<int16_t>(10 * epsilon_tweak_ratio(ratio));
}
void test_delay_lines(uint32_t delay_frames, uint32_t channels, uint32_t chunk_ms)
{
const size_t length_s = 2;
const size_t rate = 44100;
const size_t length_frames = rate * length_s;
delay_line<float> delay(delay_frames, channels, rate);
auto_array<float> input;
auto_array<float> output;
uint32_t chunk_length = channels * chunk_ms * rate / 1000;
uint32_t output_offset = 0;
uint32_t channel = 0;
/** Generate diracs every 100 frames, and check they are delayed. */
input.push_silence(length_frames * channels);
for (uint32_t i = 0; i < input.length() - 1; i+=100) {
input.data()[i + channel] = 0.5;
channel = (channel + 1) % channels;
}
dump("input.raw", input.data(), input.length());
while(input.length()) {
uint32_t to_pop = std::min<uint32_t>(input.length(), chunk_length * channels);
float * in = delay.input_buffer(to_pop / channels);
input.pop(in, to_pop);
delay.written(to_pop / channels);
output.push_silence(to_pop);
delay.output(output.data() + output_offset, to_pop / channels);
output_offset += to_pop;
}
// Check the diracs have been shifted by `delay_frames` frames.
for (uint32_t i = 0; i < output.length() - delay_frames * channels + 1; i+=100) {
ASSERT_EQ(output.data()[i + channel + delay_frames * channels], 0.5);
channel = (channel + 1) % channels;
}
dump("output.raw", output.data(), output.length());
}
/**
* This takes sine waves with a certain `channels` count, `source_rate`, and
* resample them, by chunk of `chunk_duration` milliseconds, to `target_rate`.
* Then a sample-wise comparison is performed against a sine wave generated at
* the correct rate.
*/
template<typename T>
void test_resampler_one_way(uint32_t channels, uint32_t source_rate, uint32_t target_rate, float chunk_duration)
{
size_t chunk_duration_in_source_frames = static_cast<uint32_t>(ceil(chunk_duration * source_rate / 1000.));
float resampling_ratio = static_cast<float>(source_rate) / target_rate;
cubeb_resampler_speex_one_way<T> resampler(channels, source_rate, target_rate, 3);
auto_array<T> source(channels * source_rate * 10);
auto_array<T> destination(channels * target_rate * 10);
auto_array<T> expected(channels * target_rate * 10);
uint32_t phase_index = 0;
uint32_t offset = 0;
const uint32_t buf_len = 2; /* seconds */
// generate a sine wave in each channel, at the source sample rate
source.push_silence(channels * source_rate * buf_len);
while(offset != source.length()) {
float p = phase_index++ / static_cast<float>(source_rate);
for (uint32_t j = 0; j < channels; j++) {
source.data()[offset++] = 0.5 * sin(440. * 2 * PI * p);
}
}
dump("input.raw", source.data(), source.length());
expected.push_silence(channels * target_rate * buf_len);
// generate a sine wave in each channel, at the target sample rate.
// Insert silent samples at the beginning to account for the resampler latency.
offset = resampler.latency() * channels;
for (uint32_t i = 0; i < offset; i++) {
expected.data()[i] = 0.0f;
}
phase_index = 0;
while (offset != expected.length()) {
float p = phase_index++ / static_cast<float>(target_rate);
for (uint32_t j = 0; j < channels; j++) {
expected.data()[offset++] = 0.5 * sin(440. * 2 * PI * p);
}
}
dump("expected.raw", expected.data(), expected.length());
// resample by chunk
uint32_t write_offset = 0;
destination.push_silence(channels * target_rate * buf_len);
while (write_offset < destination.length())
{
size_t output_frames = static_cast<uint32_t>(floor(chunk_duration_in_source_frames / resampling_ratio));
uint32_t input_frames = resampler.input_needed_for_output(output_frames);
resampler.input(source.data(), input_frames);
source.pop(nullptr, input_frames * channels);
resampler.output(destination.data() + write_offset,
std::min(output_frames, (destination.length() - write_offset) / channels));
write_offset += output_frames * channels;
}
dump("output.raw", destination.data(), expected.length());
// compare, taking the latency into account
bool fuzzy_equal = true;
for (uint32_t i = resampler.latency() + 1; i < expected.length(); i++) {
float diff = fabs(expected.data()[i] - destination.data()[i]);
if (diff > epsilon<T>(resampling_ratio)) {
fprintf(stderr, "divergence at %d: %f %f (delta %f)\n", i, expected.data()[i], destination.data()[i], diff);
fuzzy_equal = false;
}
}
ASSERT_TRUE(fuzzy_equal);
}
template<typename T>
cubeb_sample_format cubeb_format();
template<>
cubeb_sample_format cubeb_format<float>()
{
return CUBEB_SAMPLE_FLOAT32NE;
}
template<>
cubeb_sample_format cubeb_format<short>()
{
return CUBEB_SAMPLE_S16NE;
}
struct osc_state {
osc_state()
: input_phase_index(0)
, output_phase_index(0)
, output_offset(0)
, input_channels(0)
, output_channels(0)
{}
uint32_t input_phase_index;
uint32_t max_output_phase_index;
uint32_t output_phase_index;
uint32_t output_offset;
uint32_t input_channels;
uint32_t output_channels;
uint32_t output_rate;
uint32_t target_rate;
auto_array<float> input;
auto_array<float> output;
};
uint32_t fill_with_sine(float * buf, uint32_t rate, uint32_t channels,
uint32_t frames, uint32_t initial_phase)
{
uint32_t offset = 0;
for (uint32_t i = 0; i < frames; i++) {
float p = initial_phase++ / static_cast<float>(rate);
for (uint32_t j = 0; j < channels; j++) {
buf[offset++] = 0.5 * sin(440. * 2 * PI * p);
}
}
return initial_phase;
}
long data_cb_resampler(cubeb_stream * /*stm*/, void * user_ptr,
const void * input_buffer, void * output_buffer, long frame_count)
{
osc_state * state = reinterpret_cast<osc_state*>(user_ptr);
const float * in = reinterpret_cast<const float*>(input_buffer);
float * out = reinterpret_cast<float*>(output_buffer);
state->input.push(in, frame_count * state->input_channels);
/* Check how much output frames we need to write */
uint32_t remaining = state->max_output_phase_index - state->output_phase_index;
uint32_t to_write = std::min<uint32_t>(remaining, frame_count);
state->output_phase_index = fill_with_sine(out,
state->target_rate,
state->output_channels,
to_write,
state->output_phase_index);
return to_write;
}
template<typename T>
bool array_fuzzy_equal(const auto_array<T>& lhs, const auto_array<T>& rhs, T epsi)
{
uint32_t len = std::min(lhs.length(), rhs.length());
for (uint32_t i = 0; i < len; i++) {
if (fabs(lhs.at(i) - rhs.at(i)) > epsi) {
std::cout << "not fuzzy equal at index: " << i
<< " lhs: " << lhs.at(i) << " rhs: " << rhs.at(i)
<< " delta: " << fabs(lhs.at(i) - rhs.at(i))
<< " epsilon: "<< epsi << std::endl;
return false;
}
}
return true;
}
template<typename T>
void test_resampler_duplex(uint32_t input_channels, uint32_t output_channels,
uint32_t input_rate, uint32_t output_rate,
uint32_t target_rate, float chunk_duration)
{
cubeb_stream_params input_params;
cubeb_stream_params output_params;
osc_state state;
input_params.format = output_params.format = cubeb_format<T>();
state.input_channels = input_params.channels = input_channels;
state.output_channels = output_params.channels = output_channels;
input_params.rate = input_rate;
state.output_rate = output_params.rate = output_rate;
state.target_rate = target_rate;
input_params.prefs = output_params.prefs = CUBEB_STREAM_PREF_NONE;
long got;
cubeb_resampler * resampler =
cubeb_resampler_create((cubeb_stream*)nullptr, &input_params, &output_params, target_rate,
data_cb_resampler, (void*)&state, CUBEB_RESAMPLER_QUALITY_VOIP);
long latency = cubeb_resampler_latency(resampler);
const uint32_t duration_s = 2;
int32_t duration_frames = duration_s * target_rate;
uint32_t input_array_frame_count = ceil(chunk_duration * input_rate / 1000) + ceilf(static_cast<float>(input_rate) / target_rate) * 2;
uint32_t output_array_frame_count = chunk_duration * output_rate / 1000;
auto_array<float> input_buffer(input_channels * input_array_frame_count);
auto_array<float> output_buffer(output_channels * output_array_frame_count);
auto_array<float> expected_resampled_input(input_channels * duration_frames);
auto_array<float> expected_resampled_output(output_channels * output_rate * duration_s);
state.max_output_phase_index = duration_s * target_rate;
expected_resampled_input.push_silence(input_channels * duration_frames);
expected_resampled_output.push_silence(output_channels * output_rate * duration_s);
/* expected output is a 440Hz sine wave at 16kHz */
fill_with_sine(expected_resampled_input.data() + latency,
target_rate, input_channels, duration_frames - latency, 0);
/* expected output is a 440Hz sine wave at 32kHz */
fill_with_sine(expected_resampled_output.data() + latency,
output_rate, output_channels, output_rate * duration_s - latency, 0);
while (state.output_phase_index != state.max_output_phase_index) {
uint32_t leftover_samples = input_buffer.length() * input_channels;
input_buffer.reserve(input_array_frame_count);
state.input_phase_index = fill_with_sine(input_buffer.data() + leftover_samples,
input_rate,
input_channels,
input_array_frame_count - leftover_samples,
state.input_phase_index);
long input_consumed = input_array_frame_count;
input_buffer.set_length(input_array_frame_count);
got = cubeb_resampler_fill(resampler,
input_buffer.data(), &input_consumed,
output_buffer.data(), output_array_frame_count);
/* handle leftover input */
if (input_array_frame_count != static_cast<uint32_t>(input_consumed)) {
input_buffer.pop(nullptr, input_consumed * input_channels);
} else {
input_buffer.clear();
}
state.output.push(output_buffer.data(), got * state.output_channels);
}
dump("input_expected.raw", expected_resampled_input.data(), expected_resampled_input.length());
dump("output_expected.raw", expected_resampled_output.data(), expected_resampled_output.length());
dump("input.raw", state.input.data(), state.input.length());
dump("output.raw", state.output.data(), state.output.length());
// This is disabled because the latency estimation in the resampler code is
// slightly off so we can generate expected vectors.
// See https://github.com/kinetiknz/cubeb/issues/93
// ASSERT_TRUE(array_fuzzy_equal(state.input, expected_resampled_input, epsilon<T>(input_rate/target_rate)));
// ASSERT_TRUE(array_fuzzy_equal(state.output, expected_resampled_output, epsilon<T>(output_rate/target_rate)));
cubeb_resampler_destroy(resampler);
}
#define array_size(x) (sizeof(x) / sizeof(x[0]))
TEST(cubeb, resampler_one_way)
{
/* Test one way resamplers */
for (uint32_t channels = 1; channels <= max_channels; channels++) {
for (uint32_t source_rate = 0; source_rate < array_size(sample_rates); source_rate++) {
for (uint32_t dest_rate = 0; dest_rate < array_size(sample_rates); dest_rate++) {
for (uint32_t chunk_duration = min_chunks; chunk_duration < max_chunks; chunk_duration+=chunk_increment) {
fprintf(stderr, "one_way: channels: %d, source_rate: %d, dest_rate: %d, chunk_duration: %d\n",
channels, sample_rates[source_rate], sample_rates[dest_rate], chunk_duration);
test_resampler_one_way<float>(channels, sample_rates[source_rate],
sample_rates[dest_rate], chunk_duration);
}
}
}
}
}
TEST(cubeb, DISABLED_resampler_duplex)
{
for (uint32_t input_channels = 1; input_channels <= max_channels; input_channels++) {
for (uint32_t output_channels = 1; output_channels <= max_channels; output_channels++) {
for (uint32_t source_rate_input = 0; source_rate_input < array_size(sample_rates); source_rate_input++) {
for (uint32_t source_rate_output = 0; source_rate_output < array_size(sample_rates); source_rate_output++) {
for (uint32_t dest_rate = 0; dest_rate < array_size(sample_rates); dest_rate++) {
for (uint32_t chunk_duration = min_chunks; chunk_duration < max_chunks; chunk_duration+=chunk_increment) {
fprintf(stderr, "input channels:%d output_channels:%d input_rate:%d "
"output_rate:%d target_rate:%d chunk_ms:%d\n",
input_channels, output_channels,
sample_rates[source_rate_input],
sample_rates[source_rate_output],
sample_rates[dest_rate],
chunk_duration);
test_resampler_duplex<float>(input_channels, output_channels,
sample_rates[source_rate_input],
sample_rates[source_rate_output],
sample_rates[dest_rate],
chunk_duration);
}
}
}
}
}
}
}
TEST(cubeb, resampler_delay_line)
{
for (uint32_t channel = 1; channel <= 2; channel++) {
for (uint32_t delay_frames = 4; delay_frames <= 40; delay_frames+=chunk_increment) {
for (uint32_t chunk_size = 10; chunk_size <= 30; chunk_size++) {
fprintf(stderr, "channel: %d, delay_frames: %d, chunk_size: %d\n",
channel, delay_frames, chunk_size);
test_delay_lines(delay_frames, channel, chunk_size);
}
}
}
}
long test_output_only_noop_data_cb(cubeb_stream * /*stm*/, void * /*user_ptr*/,
const void * input_buffer,
void * output_buffer, long frame_count)
{
EXPECT_TRUE(output_buffer);
EXPECT_TRUE(!input_buffer);
return frame_count;
}
TEST(cubeb, resampler_output_only_noop)
{
cubeb_stream_params output_params;
int target_rate;
output_params.rate = 44100;
output_params.channels = 1;
output_params.format = CUBEB_SAMPLE_FLOAT32NE;
target_rate = output_params.rate;
cubeb_resampler * resampler =
cubeb_resampler_create((cubeb_stream*)nullptr, nullptr, &output_params, target_rate,
test_output_only_noop_data_cb, nullptr,
CUBEB_RESAMPLER_QUALITY_VOIP);
const long out_frames = 128;
float out_buffer[out_frames];
long got;
got = cubeb_resampler_fill(resampler, nullptr, nullptr,
out_buffer, out_frames);
ASSERT_EQ(got, out_frames);
cubeb_resampler_destroy(resampler);
}
long test_drain_data_cb(cubeb_stream * /*stm*/, void * user_ptr,
const void * input_buffer,
void * output_buffer, long frame_count)
{
EXPECT_TRUE(output_buffer);
EXPECT_TRUE(!input_buffer);
auto cb_count = static_cast<int *>(user_ptr);
(*cb_count)++;
return frame_count - 1;
}
TEST(cubeb, resampler_drain)
{
cubeb_stream_params output_params;
int target_rate;
output_params.rate = 44100;
output_params.channels = 1;
output_params.format = CUBEB_SAMPLE_FLOAT32NE;
target_rate = 48000;
int cb_count = 0;
cubeb_resampler * resampler =
cubeb_resampler_create((cubeb_stream*)nullptr, nullptr, &output_params, target_rate,
test_drain_data_cb, &cb_count,
CUBEB_RESAMPLER_QUALITY_VOIP);
const long out_frames = 128;
float out_buffer[out_frames];
long got;
do {
got = cubeb_resampler_fill(resampler, nullptr, nullptr,
out_buffer, out_frames);
} while (got == out_frames);
/* The callback should be called once but not again after returning <
* frame_count. */
ASSERT_EQ(cb_count, 1);
cubeb_resampler_destroy(resampler);
}
// gtest does not support using ASSERT_EQ and friend in a function that returns
// a value.
void check_output(const void * input_buffer, void * output_buffer, long frame_count)
{
ASSERT_EQ(input_buffer, nullptr);
ASSERT_EQ(frame_count, 256);
ASSERT_TRUE(!!output_buffer);
}
long cb_passthrough_resampler_output(cubeb_stream * /*stm*/, void * /*user_ptr*/,
const void * input_buffer,
void * output_buffer, long frame_count)
{
check_output(input_buffer, output_buffer, frame_count);
return frame_count;
}
TEST(cubeb, resampler_passthrough_output_only)
{
// Test that the passthrough resampler works when there is only an output stream.
cubeb_stream_params output_params;
const size_t output_channels = 2;
output_params.channels = output_channels;
output_params.rate = 44100;
output_params.format = CUBEB_SAMPLE_FLOAT32NE;
int target_rate = output_params.rate;
cubeb_resampler * resampler =
cubeb_resampler_create((cubeb_stream*)nullptr, nullptr, &output_params,
target_rate, cb_passthrough_resampler_output, nullptr,
CUBEB_RESAMPLER_QUALITY_VOIP);
float output_buffer[output_channels * 256];
long got;
for (uint32_t i = 0; i < 30; i++) {
got = cubeb_resampler_fill(resampler, nullptr, nullptr, output_buffer, 256);
ASSERT_EQ(got, 256);
}
cubeb_resampler_destroy(resampler);
}
// gtest does not support using ASSERT_EQ and friend in a function that returns
// a value.
void check_input(const void * input_buffer, void * output_buffer, long frame_count)
{
ASSERT_EQ(output_buffer, nullptr);
ASSERT_EQ(frame_count, 256);
ASSERT_TRUE(!!input_buffer);
}
long cb_passthrough_resampler_input(cubeb_stream * /*stm*/, void * /*user_ptr*/,
const void * input_buffer,
void * output_buffer, long frame_count)
{
check_input(input_buffer, output_buffer, frame_count);
return frame_count;
}
TEST(cubeb, resampler_passthrough_input_only)
{
// Test that the passthrough resampler works when there is only an output stream.
cubeb_stream_params input_params;
const size_t input_channels = 2;
input_params.channels = input_channels;
input_params.rate = 44100;
input_params.format = CUBEB_SAMPLE_FLOAT32NE;
int target_rate = input_params.rate;
cubeb_resampler * resampler =
cubeb_resampler_create((cubeb_stream*)nullptr, &input_params, nullptr,
target_rate, cb_passthrough_resampler_input, nullptr,
CUBEB_RESAMPLER_QUALITY_VOIP);
float input_buffer[input_channels * 256];
long got;
for (uint32_t i = 0; i < 30; i++) {
long int frames = 256;
got = cubeb_resampler_fill(resampler, input_buffer, &frames, nullptr, 0);
ASSERT_EQ(got, 256);
}
cubeb_resampler_destroy(resampler);
}
template<typename T>
long seq(T* array, int stride, long start, long count)
{
uint32_t output_idx = 0;
for(int i = 0; i < count; i++) {
for (int j = 0; j < stride; j++) {
array[output_idx + j] = static_cast<T>(start + i);
}
output_idx += stride;
}
return start + count;
}
template<typename T>
void is_seq(T * array, int stride, long count, long expected_start)
{
uint32_t output_index = 0;
for (long i = 0; i < count; i++) {
for (int j = 0; j < stride; j++) {
ASSERT_EQ(array[output_index + j], expected_start + i);
}
output_index += stride;
}
}
template<typename T>
void is_not_seq(T * array, int stride, long count, long expected_start)
{
uint32_t output_index = 0;
for (long i = 0; i < count; i++) {
for (int j = 0; j < stride; j++) {
ASSERT_NE(array[output_index + j], expected_start + i);
}
output_index += stride;
}
}
struct closure {
int input_channel_count;
};
// gtest does not support using ASSERT_EQ and friend in a function that returns
// a value.
template<typename T>
void check_duplex(const T * input_buffer,
T * output_buffer, long frame_count,
int input_channel_count)
{
ASSERT_EQ(frame_count, 256);
// Silence scan-build warning.
ASSERT_TRUE(!!output_buffer); assert(output_buffer);
ASSERT_TRUE(!!input_buffer); assert(input_buffer);
int output_index = 0;
int input_index = 0;
for (int i = 0; i < frame_count; i++) {
// output is two channels, input one or two channels.
if (input_channel_count == 1) {
output_buffer[output_index] = output_buffer[output_index + 1] = input_buffer[i];
} else if (input_channel_count == 2) {
output_buffer[output_index] = input_buffer[input_index];
output_buffer[output_index + 1] = input_buffer[input_index + 1];
}
output_index += 2;
input_index += input_channel_count;
}
}
long cb_passthrough_resampler_duplex(cubeb_stream * /*stm*/, void * user_ptr,
const void * input_buffer,
void * output_buffer, long frame_count)
{
closure * c = reinterpret_cast<closure*>(user_ptr);
check_duplex<float>(static_cast<const float*>(input_buffer),
static_cast<float*>(output_buffer),
frame_count, c->input_channel_count);
return frame_count;
}
TEST(cubeb, resampler_passthrough_duplex_callback_reordering)
{
// Test that when pre-buffering on resampler creation, we can survive an input
// callback being delayed.
cubeb_stream_params input_params;
cubeb_stream_params output_params;
const int input_channels = 1;
const int output_channels = 2;
input_params.channels = input_channels;
input_params.rate = 44100;
input_params.format = CUBEB_SAMPLE_FLOAT32NE;
output_params.channels = output_channels;
output_params.rate = input_params.rate;
output_params.format = CUBEB_SAMPLE_FLOAT32NE;
int target_rate = input_params.rate;
closure c;
c.input_channel_count = input_channels;
cubeb_resampler * resampler =
cubeb_resampler_create((cubeb_stream*)nullptr, &input_params, &output_params,
target_rate, cb_passthrough_resampler_duplex, &c,
CUBEB_RESAMPLER_QUALITY_VOIP);
const long BUF_BASE_SIZE = 256;
float input_buffer_prebuffer[input_channels * BUF_BASE_SIZE * 2];
float input_buffer_glitch[input_channels * BUF_BASE_SIZE * 2];
float input_buffer_normal[input_channels * BUF_BASE_SIZE];
float output_buffer[output_channels * BUF_BASE_SIZE];
long seq_idx = 0;
long output_seq_idx = 0;
long prebuffer_frames = ARRAY_LENGTH(input_buffer_prebuffer) / input_params.channels;
seq_idx = seq(input_buffer_prebuffer, input_channels, seq_idx,
prebuffer_frames);
long got = cubeb_resampler_fill(resampler, input_buffer_prebuffer, &prebuffer_frames,
output_buffer, BUF_BASE_SIZE);
output_seq_idx += BUF_BASE_SIZE;
// prebuffer_frames will hold the frames used by the resampler.
ASSERT_EQ(prebuffer_frames, BUF_BASE_SIZE);
ASSERT_EQ(got, BUF_BASE_SIZE);
for (uint32_t i = 0; i < 300; i++) {
long int frames = BUF_BASE_SIZE;
// Simulate that sometimes, we don't have the input callback on time
if (i != 0 && (i % 100) == 0) {
long zero = 0;
got = cubeb_resampler_fill(resampler, input_buffer_normal /* unused here */,
&zero, output_buffer, BUF_BASE_SIZE);
is_seq(output_buffer, 2, BUF_BASE_SIZE, output_seq_idx);
output_seq_idx += BUF_BASE_SIZE;
} else if (i != 0 && (i % 100) == 1) {
// if this is the case, the on the next iteration, we'll have twice the
// amount of input frames
seq_idx = seq(input_buffer_glitch, input_channels, seq_idx, BUF_BASE_SIZE * 2);
frames = 2 * BUF_BASE_SIZE;
got = cubeb_resampler_fill(resampler, input_buffer_glitch, &frames, output_buffer, BUF_BASE_SIZE);
is_seq(output_buffer, 2, BUF_BASE_SIZE, output_seq_idx);
output_seq_idx += BUF_BASE_SIZE;
} else {
// normal case
seq_idx = seq(input_buffer_normal, input_channels, seq_idx, BUF_BASE_SIZE);
long normal_input_frame_count = 256;
got = cubeb_resampler_fill(resampler, input_buffer_normal, &normal_input_frame_count, output_buffer, BUF_BASE_SIZE);
is_seq(output_buffer, 2, BUF_BASE_SIZE, output_seq_idx);
output_seq_idx += BUF_BASE_SIZE;
}
ASSERT_EQ(got, BUF_BASE_SIZE);
}
cubeb_resampler_destroy(resampler);
}
// Artificially simulate output thread underruns,
// by building up artificial delay in the input.
// Check that the frame drop logic kicks in.
TEST(cubeb, resampler_drift_drop_data)
{
for (uint32_t input_channels = 1; input_channels < 3; input_channels++) {
cubeb_stream_params input_params;
cubeb_stream_params output_params;
const int output_channels = 2;
const int sample_rate = 44100;
input_params.channels = input_channels;
input_params.rate = sample_rate;
input_params.format = CUBEB_SAMPLE_FLOAT32NE;
output_params.channels = output_channels;
output_params.rate = sample_rate;
output_params.format = CUBEB_SAMPLE_FLOAT32NE;
int target_rate = input_params.rate;
closure c;
c.input_channel_count = input_channels;
cubeb_resampler * resampler =
cubeb_resampler_create((cubeb_stream*)nullptr, &input_params, &output_params,
target_rate, cb_passthrough_resampler_duplex, &c,
CUBEB_RESAMPLER_QUALITY_VOIP);
const long BUF_BASE_SIZE = 256;
// The factor by which the deadline is missed. This is intentionally
// kind of large to trigger the frame drop quickly. In real life, multiple
// smaller under-runs would accumulate.
const long UNDERRUN_FACTOR = 10;
// Number buffer used for pre-buffering, that some backends do.
const long PREBUFFER_FACTOR = 2;
std::vector<float> input_buffer_prebuffer(input_channels * BUF_BASE_SIZE * PREBUFFER_FACTOR);
std::vector<float> input_buffer_glitch(input_channels * BUF_BASE_SIZE * UNDERRUN_FACTOR);
std::vector<float> input_buffer_normal(input_channels * BUF_BASE_SIZE);
std::vector<float> output_buffer(output_channels * BUF_BASE_SIZE);
long seq_idx = 0;
long output_seq_idx = 0;
long prebuffer_frames = input_buffer_prebuffer.size() / input_params.channels;
seq_idx = seq(input_buffer_prebuffer.data(), input_channels, seq_idx,
prebuffer_frames);
long got = cubeb_resampler_fill(resampler, input_buffer_prebuffer.data(), &prebuffer_frames,
output_buffer.data(), BUF_BASE_SIZE);
output_seq_idx += BUF_BASE_SIZE;
// prebuffer_frames will hold the frames used by the resampler.
ASSERT_EQ(prebuffer_frames, BUF_BASE_SIZE);
ASSERT_EQ(got, BUF_BASE_SIZE);
for (uint32_t i = 0; i < 300; i++) {
long int frames = BUF_BASE_SIZE;
if (i != 0 && (i % 100) == 1) {
// Once in a while, the output thread misses its deadline.
// The input thread still produces data, so it ends up accumulating. Simulate this by providing a
// much bigger input buffer. Check that the sequence is now unaligned, meaning we've dropped data
// to keep everything in sync.
seq_idx = seq(input_buffer_glitch.data(), input_channels, seq_idx, BUF_BASE_SIZE * UNDERRUN_FACTOR);
frames = BUF_BASE_SIZE * UNDERRUN_FACTOR;
got = cubeb_resampler_fill(resampler, input_buffer_glitch.data(), &frames, output_buffer.data(), BUF_BASE_SIZE);
is_seq(output_buffer.data(), 2, BUF_BASE_SIZE, output_seq_idx);
output_seq_idx += BUF_BASE_SIZE;
}
else if (i != 0 && (i % 100) == 2) {
// On the next iteration, the sequence should be broken
seq_idx = seq(input_buffer_normal.data(), input_channels, seq_idx, BUF_BASE_SIZE);
long normal_input_frame_count = 256;
got = cubeb_resampler_fill(resampler, input_buffer_normal.data(), &normal_input_frame_count, output_buffer.data(), BUF_BASE_SIZE);
is_not_seq(output_buffer.data(), output_channels, BUF_BASE_SIZE, output_seq_idx);
// Reclock so that we can use is_seq again.
output_seq_idx = output_buffer[BUF_BASE_SIZE * output_channels - 1] + 1;
}
else {
// normal case
seq_idx = seq(input_buffer_normal.data(), input_channels, seq_idx, BUF_BASE_SIZE);
long normal_input_frame_count = 256;
got = cubeb_resampler_fill(resampler, input_buffer_normal.data(), &normal_input_frame_count, output_buffer.data(), BUF_BASE_SIZE);
is_seq(output_buffer.data(), output_channels, BUF_BASE_SIZE, output_seq_idx);
output_seq_idx += BUF_BASE_SIZE;
}
ASSERT_EQ(got, BUF_BASE_SIZE);
}
cubeb_resampler_destroy(resampler);
}
}
static long
passthrough_resampler_fill_eq_input(cubeb_stream * stream,
void * user_ptr,
void const * input_buffer,
void * output_buffer,
long nframes) {
// gtest does not support using ASSERT_EQ and friends in a
// function that returns a value.
[nframes, input_buffer]() {
ASSERT_EQ(nframes, 32);
const float* input = static_cast<const float*>(input_buffer);
for (int i = 0; i < 64; ++i) {
ASSERT_FLOAT_EQ(input[i], 0.01 * i);
}
}();
return nframes;
}
TEST(cubeb, passthrough_resampler_fill_eq_input) {
uint32_t channels = 2;
uint32_t sample_rate = 44100;
passthrough_resampler<float> resampler =
passthrough_resampler<float>(nullptr, passthrough_resampler_fill_eq_input,
nullptr, channels, sample_rate);
long input_frame_count = 32;
long output_frame_count = 32;
float input[64] = {};
float output[64] = {};
for (uint32_t i = 0; i < input_frame_count * channels; ++i) {
input[i] = 0.01 * i;
}
long got = resampler.fill(input, &input_frame_count, output, output_frame_count);
ASSERT_EQ(got, output_frame_count);
// Input frames used must be equal to output frames.
ASSERT_EQ(input_frame_count, output_frame_count);
}
static long
passthrough_resampler_fill_short_input(cubeb_stream * stream,
void * user_ptr,
void const * input_buffer,
void * output_buffer,
long nframes) {
// gtest does not support using ASSERT_EQ and friends in a
// function that returns a value.
[nframes, input_buffer]() {
ASSERT_EQ(nframes, 32);
const float* input = static_cast<const float*>(input_buffer);
// First part contains the input
for (int i = 0; i < 32; ++i) {
ASSERT_FLOAT_EQ(input[i], 0.01 * i);
}
// missing part contains silence
for (int i = 32; i < 64; ++i) {
ASSERT_FLOAT_EQ(input[i], 0.0);
}
}();
return nframes;
}
TEST(cubeb, passthrough_resampler_fill_short_input) {
uint32_t channels = 2;
uint32_t sample_rate = 44100;
passthrough_resampler<float> resampler =
passthrough_resampler<float>(nullptr, passthrough_resampler_fill_short_input,
nullptr, channels, sample_rate);
long input_frame_count = 16;
long output_frame_count = 32;
float input[64] = {};
float output[64] = {};
for (uint32_t i = 0; i < input_frame_count * channels; ++i) {
input[i] = 0.01 * i;
}
long got = resampler.fill(input, &input_frame_count, output, output_frame_count);
ASSERT_EQ(got, output_frame_count);
// Input frames used are less than the output frames due to glitch.
ASSERT_EQ(input_frame_count, output_frame_count - 16);
}
static long
passthrough_resampler_fill_input_left(cubeb_stream * stream,
void * user_ptr,
void const * input_buffer,
void * output_buffer,
long nframes) {
// gtest does not support using ASSERT_EQ and friends in a
// function that returns a value.
int iteration = *static_cast<int*>(user_ptr);
if (iteration == 1) {
[nframes, input_buffer]() {
ASSERT_EQ(nframes, 32);
const float* input = static_cast<const float*>(input_buffer);
for (int i = 0; i < 64; ++i) {
ASSERT_FLOAT_EQ(input[i], 0.01 * i);
}
}();
} else if (iteration == 2) {
[nframes, input_buffer]() {
ASSERT_EQ(nframes, 32);
const float* input = static_cast<const float*>(input_buffer);
for (int i = 0; i < 32; ++i) {
// First part contains the reamaining input samples from previous
// iteration (since they were more).
ASSERT_FLOAT_EQ(input[i], 0.01 * (i + 64));
// next part contains the new buffer
ASSERT_FLOAT_EQ(input[i + 32], 0.01 * i);
}
}();
} else if (iteration == 3) {
[nframes, input_buffer]() {
ASSERT_EQ(nframes, 32);
const float* input = static_cast<const float*>(input_buffer);
for (int i = 0; i < 32; ++i) {
// First part (16 frames) contains the reamaining input samples
// from previous iteration (since they were more).
ASSERT_FLOAT_EQ(input[i], 0.01 * (i + 32));
}
for (int i = 0; i < 16; ++i) {
// next part (8 frames) contains the new input buffer.
ASSERT_FLOAT_EQ(input[i + 32], 0.01 * i);
// last part (8 frames) contains silence.
ASSERT_FLOAT_EQ(input[i + 32 + 16], 0.0);
}
}();
}
return nframes;
}
TEST(cubeb, passthrough_resampler_fill_input_left) {
const uint32_t channels = 2;
const uint32_t sample_rate = 44100;
int iteration = 0;
passthrough_resampler<float> resampler =
passthrough_resampler<float>(nullptr, passthrough_resampler_fill_input_left,
&iteration, channels, sample_rate);
long input_frame_count = 48; // 32 + 16
const long output_frame_count = 32;
float input[96] = {};
float output[64] = {};
for (uint32_t i = 0; i < input_frame_count * channels; ++i) {
input[i] = 0.01 * i;
}
// 1st iteration, add the extra input.
iteration = 1;
long got = resampler.fill(input, &input_frame_count, output, output_frame_count);
ASSERT_EQ(got, output_frame_count);
// Input frames used must be equal to output frames.
ASSERT_EQ(input_frame_count, output_frame_count);
// 2st iteration, use the extra input from previous iteration,
// 16 frames are remaining in the input buffer.
input_frame_count = 32; // we need 16 input frames but we get more;
iteration = 2;
got = resampler.fill(input, &input_frame_count, output, output_frame_count);
ASSERT_EQ(got, output_frame_count);
// Input frames used must be equal to output frames.
ASSERT_EQ(input_frame_count, output_frame_count);
// 3rd iteration, use the extra input from previous iteration.
// 16 frames are remaining in the input buffer.
input_frame_count = 16 - 8; // We need 16 more input frames but we only get 8.
iteration = 3;
got = resampler.fill(input, &input_frame_count, output, output_frame_count);
ASSERT_EQ(got, output_frame_count);
// Input frames used are less than the output frames due to glitch.
ASSERT_EQ(input_frame_count, output_frame_count - 8);
}
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