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Unified Diff: webrtc/modules/audio_coding/codecs/opus/opus_unittest.cc

Issue 1415173005: Prevent Opus DTX from generating intermittent noise during silence (Closed) Base URL: https://chromium.googlesource.com/external/webrtc.git@master
Patch Set: on Fredrik's comments Created 5 years, 1 month ago
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Index: webrtc/modules/audio_coding/codecs/opus/opus_unittest.cc
diff --git a/webrtc/modules/audio_coding/codecs/opus/opus_unittest.cc b/webrtc/modules/audio_coding/codecs/opus/opus_unittest.cc
index c059fc5d0171f5952dbaaf1a44b4a895f160329e..fc5d84190b8aaff891399d73ff4b5cedde7c8080 100644
--- a/webrtc/modules/audio_coding/codecs/opus/opus_unittest.cc
+++ b/webrtc/modules/audio_coding/codecs/opus/opus_unittest.cc
@@ -36,7 +36,7 @@ class OpusTest : public TestWithParam<::testing::tuple<int, int>> {
protected:
OpusTest();
- void TestDtxEffect(bool dtx);
+ void TestDtxEffect(bool dtx, int block_length_ms);
// Prepare |speech_data_| for encoding, read from a hard-coded file.
// After preparation, |speech_data_.GetNextBlock()| returns a pointer to a
@@ -53,6 +53,9 @@ class OpusTest : public TestWithParam<::testing::tuple<int, int>> {
void SetMaxPlaybackRate(WebRtcOpusEncInst* encoder,
opus_int32 expect, int32_t set);
+ void CheckAudioBounded(const int16_t* audio, size_t samples, int channels,
+ uint16_t bound) const;
+
WebRtcOpusEncInst* opus_encoder_;
WebRtcOpusDecInst* opus_decoder_;
@@ -95,6 +98,16 @@ void OpusTest::SetMaxPlaybackRate(WebRtcOpusEncInst* encoder,
EXPECT_EQ(expect, bandwidth);
}
+void OpusTest::CheckAudioBounded(const int16_t* audio, size_t samples,
+ int channels, uint16_t bound) const {
+ for (size_t i = 0; i < samples; ++i) {
+ for (int c = 0; c < channels; ++c) {
+ ASSERT_GE(audio[i * channels + c], -bound);
+ ASSERT_LE(audio[i * channels + c], bound);
+ }
+ }
+}
+
int OpusTest::EncodeDecode(WebRtcOpusEncInst* encoder,
rtc::ArrayView<const int16_t> input_audio,
WebRtcOpusDecInst* decoder,
@@ -116,8 +129,9 @@ int OpusTest::EncodeDecode(WebRtcOpusEncInst* encoder,
// Test if encoder/decoder can enter DTX mode properly and do not enter DTX when
// they should not. This test is signal dependent.
-void OpusTest::TestDtxEffect(bool dtx) {
- PrepareSpeechData(channels_, 20, 2000);
+void OpusTest::TestDtxEffect(bool dtx, int block_length_ms) {
+ PrepareSpeechData(channels_, block_length_ms, 2000);
+ const size_t samples = kOpusRateKhz * block_length_ms;
// Create encoder memory.
EXPECT_EQ(0, WebRtcOpus_EncoderCreate(&opus_encoder_,
@@ -130,17 +144,17 @@ void OpusTest::TestDtxEffect(bool dtx) {
channels_ == 1 ? 32000 : 64000));
// Set input audio as silence.
- std::vector<int16_t> silence(kOpus20msFrameSamples * channels_, 0);
+ std::vector<int16_t> silence(samples * channels_, 0);
// Setting DTX.
EXPECT_EQ(0, dtx ? WebRtcOpus_EnableDtx(opus_encoder_) :
WebRtcOpus_DisableDtx(opus_encoder_));
int16_t audio_type;
- int16_t* output_data_decode = new int16_t[kOpus20msFrameSamples * channels_];
+ int16_t* output_data_decode = new int16_t[samples * channels_];
for (int i = 0; i < 100; ++i) {
- EXPECT_EQ(kOpus20msFrameSamples,
+ EXPECT_EQ(samples,
static_cast<size_t>(EncodeDecode(
opus_encoder_, speech_data_.GetNextBlock(), opus_decoder_,
output_data_decode, &audio_type)));
@@ -157,9 +171,10 @@ void OpusTest::TestDtxEffect(bool dtx) {
// We input some silent segments. In DTX mode, the encoder will stop sending.
// However, DTX may happen after a while.
for (int i = 0; i < 30; ++i) {
- EXPECT_EQ(kOpus20msFrameSamples, static_cast<size_t>(EncodeDecode(
- opus_encoder_, silence, opus_decoder_,
- output_data_decode, &audio_type)));
+ EXPECT_EQ(samples,
+ static_cast<size_t>(EncodeDecode(
+ opus_encoder_, silence, opus_decoder_, output_data_decode,
+ &audio_type)));
if (!dtx) {
EXPECT_GT(encoded_bytes_, 1U);
EXPECT_EQ(0, opus_encoder_->in_dtx_mode);
@@ -175,21 +190,47 @@ void OpusTest::TestDtxEffect(bool dtx) {
// When Opus is in DTX, it wakes up in a regular basis. It sends two packets,
// one with an arbitrary size and the other of 1-byte, then stops sending for
- // 19 frames.
- const int cycles = 5;
- for (int j = 0; j < cycles; ++j) {
- // DTX mode is maintained 19 frames.
- for (int i = 0; i < 19; ++i) {
- EXPECT_EQ(kOpus20msFrameSamples,
- static_cast<size_t>(
- EncodeDecode(opus_encoder_, silence, opus_decoder_,
- output_data_decode, &audio_type)));
+ // a certain number of frames.
+
+ // |max_dtx_frames| is the maximum number of frames Opus can stay in DTX.
+ const int max_dtx_frames = 400 / block_length_ms + 1;
+
+ // We run |kRunTimeMs| milliseconds of pure silence.
+ const int kRunTimeMs = 2000;
+
+ // We check that, after a |kCheckTimeMs| milliseconds (given that the CNG in
+ // Opus needs time to adapt), the absolute values of DTX decoded signal are
+ // bounded by |kOutputValueBound|.
+ const int kCheckTimeMs = 1500;
+
+#if defined(OPUS_FIXED_POINT)
+ const uint16_t kOutputValueBound = 20;
+#else
+ const uint16_t kOutputValueBound = 2;
+#endif
+
+ int time = 0;
+ while (time < kRunTimeMs) {
+ // DTX mode is maintained for maximum |max_dtx_frames| frames.
+ int i = 0;
+ for (; i < max_dtx_frames; ++i) {
+ time += block_length_ms;
+ EXPECT_EQ(samples,
+ static_cast<size_t>(EncodeDecode(
+ opus_encoder_, silence, opus_decoder_, output_data_decode,
+ &audio_type)));
if (dtx) {
+ if (encoded_bytes_ > 1)
+ break;
EXPECT_EQ(0U, encoded_bytes_) // Send 0 byte.
<< "Opus should have entered DTX mode.";
EXPECT_EQ(1, opus_encoder_->in_dtx_mode);
EXPECT_EQ(1, opus_decoder_->in_dtx_mode);
EXPECT_EQ(2, audio_type); // Comfort noise.
+ if (time >= kCheckTimeMs) {
+ CheckAudioBounded(output_data_decode, samples, channels_,
+ kOutputValueBound);
+ }
} else {
EXPECT_GT(encoded_bytes_, 1U);
EXPECT_EQ(0, opus_encoder_->in_dtx_mode);
@@ -198,25 +239,31 @@ void OpusTest::TestDtxEffect(bool dtx) {
}
}
- // Quit DTX after 19 frames.
- EXPECT_EQ(kOpus20msFrameSamples, static_cast<size_t>(EncodeDecode(
- opus_encoder_, silence, opus_decoder_,
- output_data_decode, &audio_type)));
+ if (dtx) {
+ // With DTX, Opus must stop transmission for some time.
+ EXPECT_GT(i, 1);
+ }
- EXPECT_GT(encoded_bytes_, 1U);
+ // We expect a normal payload.
EXPECT_EQ(0, opus_encoder_->in_dtx_mode);
EXPECT_EQ(0, opus_decoder_->in_dtx_mode);
EXPECT_EQ(0, audio_type); // Speech.
// Enters DTX again immediately.
- EXPECT_EQ(kOpus20msFrameSamples, static_cast<size_t>(EncodeDecode(
- opus_encoder_, silence, opus_decoder_,
- output_data_decode, &audio_type)));
+ time += block_length_ms;
+ EXPECT_EQ(samples,
+ static_cast<size_t>(EncodeDecode(
+ opus_encoder_, silence, opus_decoder_, output_data_decode,
+ &audio_type)));
if (dtx) {
EXPECT_EQ(1U, encoded_bytes_); // Send 1 byte.
EXPECT_EQ(1, opus_encoder_->in_dtx_mode);
EXPECT_EQ(1, opus_decoder_->in_dtx_mode);
EXPECT_EQ(2, audio_type); // Comfort noise.
+ if (time >= kCheckTimeMs) {
+ CheckAudioBounded(output_data_decode, samples, channels_,
+ kOutputValueBound);
+ }
} else {
EXPECT_GT(encoded_bytes_, 1U);
EXPECT_EQ(0, opus_encoder_->in_dtx_mode);
@@ -228,9 +275,10 @@ void OpusTest::TestDtxEffect(bool dtx) {
silence[0] = 10000;
if (dtx) {
// Verify that encoder/decoder can jump out from DTX mode.
- EXPECT_EQ(kOpus20msFrameSamples, static_cast<size_t>(EncodeDecode(
- opus_encoder_, silence, opus_decoder_,
- output_data_decode, &audio_type)));
+ EXPECT_EQ(samples,
+ static_cast<size_t>(EncodeDecode(
+ opus_encoder_, silence, opus_decoder_, output_data_decode,
+ &audio_type)));
EXPECT_GT(encoded_bytes_, 1U);
EXPECT_EQ(0, opus_encoder_->in_dtx_mode);
EXPECT_EQ(0, opus_decoder_->in_dtx_mode);
@@ -436,11 +484,15 @@ TEST_P(OpusTest, OpusEnableDisableDtx) {
}
TEST_P(OpusTest, OpusDtxOff) {
- TestDtxEffect(false);
+ TestDtxEffect(false, 10);
+ TestDtxEffect(false, 20);
+ TestDtxEffect(false, 40);
}
TEST_P(OpusTest, OpusDtxOn) {
- TestDtxEffect(true);
+ TestDtxEffect(true, 10);
+ TestDtxEffect(true, 20);
+ TestDtxEffect(true, 40);
}
TEST_P(OpusTest, OpusSetPacketLossRate) {
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