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Run fullband processing at output rate on ARM

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The audio processing in the band-split domain on ARM platforms
operate at a sampling frequency of 32 kHz. This CL upsamples
the signal to fullband before the "fullband processing"
if an output rate of 48 kHz is chosen.

Change-Id: I268acd33aff1fcfa4f75ba8c0fb3e16abb9f74e8
Bug: b/130016532
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/155640
Commit-Queue: Gustaf Ullberg <gustaf@webrtc.org>
Reviewed-by: Per Åhgren <peah@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#29415}
This commit is contained in:
Gustaf Ullberg
2019-10-09 13:02:14 +02:00
committed by Commit Bot
parent 1d3008bfc6
commit 422b9e0982
5 changed files with 119 additions and 13 deletions
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44
modules/audio_processing/audio_buffer_unittest.cc
View File

@ -10,6 +10,7 @@
#include "modules/audio_processing/audio_buffer.h"
#include <cmath>
#include "test/gtest.h"
namespace webrtc {
@ -44,4 +45,47 @@ TEST(AudioBufferTest, SetNumChannelsDeathTest) {
}
#endif
TEST(AudioBufferTest, CopyWithoutResampling) {
AudioBuffer ab1(32000, 2, 32000, 2, 32000, 2);
AudioBuffer ab2(32000, 2, 32000, 2, 32000, 2);
// Fill first buffer.
for (size_t ch = 0; ch < ab1.num_channels(); ++ch) {
for (size_t i = 0; i < ab1.num_frames(); ++i) {
ab1.channels()[ch][i] = i + ch;
}
}
// Copy to second buffer.
ab1.CopyTo(&ab2);
// Verify content of second buffer.
for (size_t ch = 0; ch < ab2.num_channels(); ++ch) {
for (size_t i = 0; i < ab2.num_frames(); ++i) {
EXPECT_EQ(ab2.channels()[ch][i], i + ch);
}
}
}
TEST(AudioBufferTest, CopyWithResampling) {
AudioBuffer ab1(32000, 2, 32000, 2, 48000, 2);
AudioBuffer ab2(48000, 2, 48000, 2, 48000, 2);
float energy_ab1 = 0.f;
float energy_ab2 = 0.f;
const float pi = std::acos(-1.f);
// Put a sine and compute energy of first buffer.
for (size_t ch = 0; ch < ab1.num_channels(); ++ch) {
for (size_t i = 0; i < ab1.num_frames(); ++i) {
ab1.channels()[ch][i] = std::sin(2 * pi * 100.f / 32000.f * i);
energy_ab1 += ab1.channels()[ch][i] * ab1.channels()[ch][i];
}
}
// Copy to second buffer.
ab1.CopyTo(&ab2);
// Compute energy of second buffer.
for (size_t ch = 0; ch < ab2.num_channels(); ++ch) {
for (size_t i = 0; i < ab2.num_frames(); ++i) {
energy_ab2 += ab2.channels()[ch][i] * ab2.channels()[ch][i];
}
}
// Verify that energies match.
EXPECT_NEAR(energy_ab1, energy_ab2 * 32000.f / 48000.f, .01f * energy_ab1);
}
} // namespace webrtc