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We believe the rate is constrained by the audio driver in practice, but want to verify this assumption. The valid range 8-192 kHz covers all sample rates in general use for audio data. Note we must use an error return instead of an assertion since these bounds are verified by unit tests, which do not catch MOZ_ASSERT().
95 lines
3.0 KiB
C++
95 lines
3.0 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "gtest/gtest.h"
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#include "OpusTrackEncoder.h"
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using namespace mozilla;
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class TestOpusTrackEncoder : public OpusTrackEncoder
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{
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public:
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// Return true if it has successfully initialized the Opus encoder.
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bool TestOpusCreation(int aChannels, int aSamplingRate)
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{
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if (Init(aChannels, aSamplingRate) == NS_OK) {
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if (GetPacketDuration()) {
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return true;
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}
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}
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return false;
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}
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// Return the sample rate of data to be fed to the Opus encoder, could be
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// re-sampled if it was not one of the Opus supported sampling rates.
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// Init() is expected to be called first.
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int TestGetOutputSampleRate()
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{
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return mInitialized ? GetOutputSampleRate() : 0;
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}
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};
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static bool
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TestOpusInit(int aChannels, int aSamplingRate)
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{
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TestOpusTrackEncoder encoder;
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return encoder.TestOpusCreation(aChannels, aSamplingRate);
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}
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static int
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TestOpusResampler(int aChannels, int aSamplingRate)
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{
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TestOpusTrackEncoder encoder;
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EXPECT_TRUE(encoder.TestOpusCreation(aChannels, aSamplingRate));
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return encoder.TestGetOutputSampleRate();
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}
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TEST(Media, OpusEncoder_Init)
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{
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// Expect false with 0 or negative channels of input signal.
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EXPECT_FALSE(TestOpusInit(0, 16000));
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EXPECT_FALSE(TestOpusInit(-1, 16000));
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// The Opus format supports up to 8 channels, and supports multitrack audio up
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// to 255 channels, but the current implementation supports only mono and
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// stereo, and downmixes any more than that.
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// Expect false with channels of input signal exceed the max supported number.
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EXPECT_FALSE(TestOpusInit(8 + 1, 16000));
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// Should accept channels within valid range.
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for (int i = 1; i <= 8; i++) {
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EXPECT_TRUE(TestOpusInit(i, 16000));
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}
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// Expect false with 0 or negative sampling rate of input signal.
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EXPECT_FALSE(TestOpusInit(1, 0));
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EXPECT_FALSE(TestOpusInit(1, -1));
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// Verify sample rate bounds checking.
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EXPECT_FALSE(TestOpusInit(2, 2000));
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EXPECT_FALSE(TestOpusInit(2, 4000));
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EXPECT_FALSE(TestOpusInit(2, 7999));
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EXPECT_TRUE(TestOpusInit(2, 8000));
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EXPECT_TRUE(TestOpusInit(2, 192000));
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EXPECT_FALSE(TestOpusInit(2, 192001));
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EXPECT_FALSE(TestOpusInit(2, 200000));
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}
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TEST(Media, OpusEncoder_Resample)
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{
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// Sampling rates of data to be fed to Opus encoder, should remain unchanged
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// if it is one of Opus supported rates (8000, 12000, 16000, 24000 and 48000
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// (kHz)) at initialization.
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EXPECT_TRUE(TestOpusResampler(1, 8000) == 8000);
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EXPECT_TRUE(TestOpusResampler(1, 12000) == 12000);
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EXPECT_TRUE(TestOpusResampler(1, 16000) == 16000);
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EXPECT_TRUE(TestOpusResampler(1, 24000) == 24000);
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EXPECT_TRUE(TestOpusResampler(1, 48000) == 48000);
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// Otherwise, it should be resampled to 48kHz by resampler.
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EXPECT_FALSE(TestOpusResampler(1, 9600) == 9600);
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EXPECT_FALSE(TestOpusResampler(1, 44100) == 44100);
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}
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