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Add a wrapper around PushSincResampler and the old Resampler.

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The old resampler is used whenever it supports the requested rates. Otherwise
the sinc resampler is enabled.

Integrated with output_mixer in order to test the change through
output_mixer_unittest. The sinc resampler will not yet be used, since we don't
feed VoE with any rates that trigger it.

BUG=webrtc:1395
R=bjornv@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/1355004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@3915 4adac7df-926f-26a2-2b94-8c16560cd09d
This commit is contained in:
andrew@webrtc.org
2013-04-29 17:27:29 +00:00
parent 5b7120c81b
commit 50b2efef6e
12 changed files with 513 additions and 77 deletions
Download Patch File Download Diff File Expand all files Collapse all files

63
webrtc/voice_engine/output_mixer_unittest.cc
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@ -10,10 +10,9 @@
#include <math.h>
#include "gtest/gtest.h"
#include "output_mixer.h"
#include "output_mixer_internal.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "webrtc/voice_engine/output_mixer.h"
#include "webrtc/voice_engine/output_mixer_internal.h"
namespace webrtc {
namespace voe {
@ -32,7 +31,7 @@ class OutputMixerTest : public ::testing::Test {
void RunResampleTest(int src_channels, int src_sample_rate_hz,
int dst_channels, int dst_sample_rate_hz);
Resampler resampler_;
PushResampler resampler_;
AudioFrame src_frame_;
AudioFrame dst_frame_;
AudioFrame golden_frame_;
@ -42,6 +41,7 @@ class OutputMixerTest : public ::testing::Test {
// used so non-integer values result in rounding error, but not an accumulating
// error.
void SetMonoFrame(AudioFrame* frame, float data, int sample_rate_hz) {
memset(frame->data_, 0, sizeof(frame->data_));
frame->num_channels_ = 1;
frame->sample_rate_hz_ = sample_rate_hz;
frame->samples_per_channel_ = sample_rate_hz / 100;
@ -59,6 +59,7 @@ void SetMonoFrame(AudioFrame* frame, float data) {
// each channel respectively.
void SetStereoFrame(AudioFrame* frame, float left, float right,
int sample_rate_hz) {
memset(frame->data_, 0, sizeof(frame->data_));
frame->num_channels_ = 2;
frame->sample_rate_hz_ = sample_rate_hz;
frame->samples_per_channel_ = sample_rate_hz / 100;
@ -80,13 +81,14 @@ void VerifyParams(const AudioFrame& ref_frame, const AudioFrame& test_frame) {
}
// Computes the best SNR based on the error between |ref_frame| and
// |test_frame|. It allows for up to a 30 sample delay between the signals to
// compensate for the resampling delay.
float ComputeSNR(const AudioFrame& ref_frame, const AudioFrame& test_frame) {
// |test_frame|. It allows for up to a |max_delay| in samples between the
// signals to compensate for the resampling delay.
float ComputeSNR(const AudioFrame& ref_frame, const AudioFrame& test_frame,
int max_delay) {
VerifyParams(ref_frame, test_frame);
float best_snr = 0;
int best_delay = 0;
for (int delay = 0; delay < 30; delay++) {
for (int delay = 0; delay <= max_delay; delay++) {
float mse = 0;
float variance = 0;
for (int i = 0; i < ref_frame.samples_per_channel_ *
@ -120,14 +122,14 @@ void OutputMixerTest::RunResampleTest(int src_channels,
int src_sample_rate_hz,
int dst_channels,
int dst_sample_rate_hz) {
Resampler resampler; // Create a new one with every test.
const int16_t kSrcLeft = 60; // Shouldn't overflow for any used sample rate.
const int16_t kSrcRight = 30;
const float kResamplingFactor = (1.0 * src_sample_rate_hz) /
PushResampler resampler; // Create a new one with every test.
const int16_t kSrcLeft = 30; // Shouldn't overflow for any used sample rate.
const int16_t kSrcRight = 15;
const float resampling_factor = (1.0 * src_sample_rate_hz) /
dst_sample_rate_hz;
const float kDstLeft = kResamplingFactor * kSrcLeft;
const float kDstRight = kResamplingFactor * kSrcRight;
const float kDstMono = (kDstLeft + kDstRight) / 2;
const float dst_left = resampling_factor * kSrcLeft;
const float dst_right = resampling_factor * kSrcRight;
const float dst_mono = (dst_left + dst_right) / 2;
if (src_channels == 1)
SetMonoFrame(&src_frame_, kSrcLeft, src_sample_rate_hz);
else
@ -136,27 +138,27 @@ void OutputMixerTest::RunResampleTest(int src_channels,
if (dst_channels == 1) {
SetMonoFrame(&dst_frame_, 0, dst_sample_rate_hz);
if (src_channels == 1)
SetMonoFrame(&golden_frame_, kDstLeft, dst_sample_rate_hz);
SetMonoFrame(&golden_frame_, dst_left, dst_sample_rate_hz);
else
SetMonoFrame(&golden_frame_, kDstMono, dst_sample_rate_hz);
SetMonoFrame(&golden_frame_, dst_mono, dst_sample_rate_hz);
} else {
SetStereoFrame(&dst_frame_, 0, 0, dst_sample_rate_hz);
if (src_channels == 1)
SetStereoFrame(&golden_frame_, kDstLeft, kDstLeft, dst_sample_rate_hz);
SetStereoFrame(&golden_frame_, dst_left, dst_left, dst_sample_rate_hz);
else
SetStereoFrame(&golden_frame_, kDstLeft, kDstRight, dst_sample_rate_hz);
SetStereoFrame(&golden_frame_, dst_left, dst_right, dst_sample_rate_hz);
}
// The sinc resampler has a known delay, which we compute here. Multiplying by
// two gives us a crude maximum for any resampling, as the old resampler
// typically (but not always) has lower delay.
static const int kInputKernelDelaySamples = 16;
const int max_delay = static_cast<double>(dst_sample_rate_hz)
/ src_sample_rate_hz * kInputKernelDelaySamples * dst_channels * 2;
printf("(%d, %d Hz) -> (%d, %d Hz) ", // SNR reported on the same line later.
src_channels, src_sample_rate_hz, dst_channels, dst_sample_rate_hz);
EXPECT_EQ(0, RemixAndResample(src_frame_, &resampler, &dst_frame_));
EXPECT_GT(ComputeSNR(golden_frame_, dst_frame_), 40.0f);
}
TEST_F(OutputMixerTest, RemixAndResampleFailsWithBadSampleRate) {
SetMonoFrame(&dst_frame_, 10, 44100);
EXPECT_EQ(-1, RemixAndResample(src_frame_, &resampler_, &dst_frame_));
VerifyFramesAreEqual(src_frame_, dst_frame_);
EXPECT_GT(ComputeSNR(golden_frame_, dst_frame_, max_delay), 39.0f);
}
TEST_F(OutputMixerTest, RemixAndResampleCopyFrameSucceeds) {
@ -190,10 +192,9 @@ TEST_F(OutputMixerTest, RemixAndResampleMixingOnlySucceeds) {
}
TEST_F(OutputMixerTest, RemixAndResampleSucceeds) {
// We don't attempt to be exhaustive here, but just get good coverage. Some
// combinations of rates will not be resampled, and some give an odd
// resampling factor which makes it more difficult to evaluate.
const int kSampleRates[] = {16000, 32000, 48000};
// TODO(ajm): convert this to the parameterized TEST_P style used in
// sinc_resampler_unittest.cc. We can then easily add tighter SNR thresholds.
const int kSampleRates[] = {8000, 16000, 32000, 44100, 48000, 96000};
const int kSampleRatesSize = sizeof(kSampleRates) / sizeof(*kSampleRates);
const int kChannels[] = {1, 2};
const int kChannelsSize = sizeof(kChannels) / sizeof(*kChannels);