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/*
* Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include <cstring>
#include "testing/gtest/include/gtest/gtest.h"
#include "webrtc/base/arraysize.h"
#include "webrtc/base/safe_conversions.h"
#include "webrtc/modules/audio_coding/codecs/mock/mock_audio_encoder.h"
#include "webrtc/modules/audio_coding/main/acm2/codec_owner.h"
namespace webrtc {
namespace acm2 {
using ::testing::Return;
using ::testing::InSequence;
namespace {
const int kDataLengthSamples = 80;
const int kPacketSizeSamples = 2 * kDataLengthSamples;
const int16_t kZeroData[kDataLengthSamples] = {0};
const CodecInst kDefaultCodecInst =
{0, "pcmu", 8000, kPacketSizeSamples, 1, 64000};
const int kCngPt = 13;
} // namespace
class CodecOwnerTest : public ::testing::Test {
protected:
CodecOwnerTest() : timestamp_(0) {}
void CreateCodec() {
ASSERT_TRUE(
codec_owner_.SetEncoders(kDefaultCodecInst, kCngPt, VADNormal, -1));
}
void EncodeAndVerify(size_t expected_out_length,
uint32_t expected_timestamp,
int expected_payload_type,
int expected_send_even_if_empty) {
uint8_t out[kPacketSizeSamples];
AudioEncoder::EncodedInfo encoded_info;
encoded_info = codec_owner_.Encoder()->Encode(
timestamp_, kZeroData, kDataLengthSamples, kPacketSizeSamples, out);
timestamp_ += kDataLengthSamples;
EXPECT_TRUE(encoded_info.redundant.empty());
EXPECT_EQ(expected_out_length, encoded_info.encoded_bytes);
EXPECT_EQ(expected_timestamp, encoded_info.encoded_timestamp);
if (expected_payload_type >= 0)
EXPECT_EQ(expected_payload_type, encoded_info.payload_type);
if (expected_send_even_if_empty >= 0)
EXPECT_EQ(static_cast<bool>(expected_send_even_if_empty),
encoded_info.send_even_if_empty);
}
// Verify that the speech encoder's Reset method is called when CNG or RED
// (or both) are switched on, but not when they're switched off.
void TestCngAndRedResetSpeechEncoder(bool use_cng, bool use_red) {
MockAudioEncoder speech_encoder;
EXPECT_CALL(speech_encoder, NumChannels())
.WillRepeatedly(Return(1));
EXPECT_CALL(speech_encoder, Max10MsFramesInAPacket())
.WillRepeatedly(Return(2));
EXPECT_CALL(speech_encoder, SampleRateHz())
.WillRepeatedly(Return(8000));
{
InSequence s;
EXPECT_CALL(speech_encoder, Mark("start off"));
EXPECT_CALL(speech_encoder, Mark("switch on"));
if (use_cng || use_red)
EXPECT_CALL(speech_encoder, Reset());
EXPECT_CALL(speech_encoder, Mark("start on"));
if (use_cng || use_red)
EXPECT_CALL(speech_encoder, Reset());
EXPECT_CALL(speech_encoder, Mark("switch off"));
EXPECT_CALL(speech_encoder, Die());
}
int cng_pt = use_cng ? 17 : -1;
int red_pt = use_red ? 19 : -1;
speech_encoder.Mark("start off");
codec_owner_.SetEncoders(&speech_encoder, -1, VADNormal, -1);
speech_encoder.Mark("switch on");
codec_owner_.ChangeCngAndRed(cng_pt, VADNormal, red_pt);
speech_encoder.Mark("start on");
codec_owner_.SetEncoders(&speech_encoder, cng_pt, VADNormal, red_pt);
speech_encoder.Mark("switch off");
codec_owner_.ChangeCngAndRed(-1, VADNormal, -1);
}
CodecOwner codec_owner_;
uint32_t timestamp_;
};
// This test verifies that CNG frames are delivered as expected. Since the frame
// size is set to 20 ms, we expect the first encode call to produce no output
// (which is signaled as 0 bytes output of type kNoEncoding). The next encode
// call should produce one SID frame of 9 bytes. The third call should not
// result in any output (just like the first one). The fourth and final encode
// call should produce an "empty frame", which is like no output, but with
// AudioEncoder::EncodedInfo::send_even_if_empty set to true. (The reason to
// produce an empty frame is to drive sending of DTMF packets in the RTP/RTCP
// module.)
TEST_F(CodecOwnerTest, VerifyCngFrames) {
CreateCodec();
uint32_t expected_timestamp = timestamp_;
// Verify no frame.
{
SCOPED_TRACE("First encoding");
EncodeAndVerify(0, expected_timestamp, -1, -1);
}
// Verify SID frame delivered.
{
SCOPED_TRACE("Second encoding");
EncodeAndVerify(9, expected_timestamp, kCngPt, 1);
}
// Verify no frame.
{
SCOPED_TRACE("Third encoding");
EncodeAndVerify(0, expected_timestamp, -1, -1);
}
// Verify NoEncoding.
expected_timestamp += 2 * kDataLengthSamples;
{
SCOPED_TRACE("Fourth encoding");
EncodeAndVerify(0, expected_timestamp, kCngPt, 1);
}
}
TEST_F(CodecOwnerTest, ExternalEncoder) {
MockAudioEncoder external_encoder;
codec_owner_.SetEncoders(&external_encoder, -1, VADNormal, -1);
const int kSampleRateHz = 8000;
const int kPacketSizeSamples = kSampleRateHz / 100;
int16_t audio[kPacketSizeSamples] = {0};
uint8_t encoded[kPacketSizeSamples];
AudioEncoder::EncodedInfo info;
EXPECT_CALL(external_encoder, SampleRateHz())
.WillRepeatedly(Return(kSampleRateHz));
{
InSequence s;
info.encoded_timestamp = 0;
EXPECT_CALL(external_encoder,
EncodeInternal(0, audio, arraysize(encoded), encoded))
.WillOnce(Return(info));
EXPECT_CALL(external_encoder, Mark("A"));
EXPECT_CALL(external_encoder, Mark("B"));
info.encoded_timestamp = 2;
EXPECT_CALL(external_encoder,
EncodeInternal(2, audio, arraysize(encoded), encoded))
.WillOnce(Return(info));
EXPECT_CALL(external_encoder, Die());
}
info = codec_owner_.Encoder()->Encode(0, audio, arraysize(audio),
arraysize(encoded), encoded);
EXPECT_EQ(0u, info.encoded_timestamp);
external_encoder.Mark("A");
// Change to internal encoder.
CodecInst codec_inst = kDefaultCodecInst;
codec_inst.pacsize = kPacketSizeSamples;
ASSERT_TRUE(codec_owner_.SetEncoders(codec_inst, -1, VADNormal, -1));
// Don't expect any more calls to the external encoder.
info = codec_owner_.Encoder()->Encode(1, audio, arraysize(audio),
arraysize(encoded), encoded);
external_encoder.Mark("B");
// Change back to external encoder again.
codec_owner_.SetEncoders(&external_encoder, -1, VADNormal, -1);
info = codec_owner_.Encoder()->Encode(2, audio, arraysize(audio),
arraysize(encoded), encoded);
EXPECT_EQ(2u, info.encoded_timestamp);
}
TEST_F(CodecOwnerTest, CngResetsSpeechEncoder) {
TestCngAndRedResetSpeechEncoder(true, false);
}
TEST_F(CodecOwnerTest, RedResetsSpeechEncoder) {
TestCngAndRedResetSpeechEncoder(false, true);
}
TEST_F(CodecOwnerTest, CngAndRedResetsSpeechEncoder) {
TestCngAndRedResetSpeechEncoder(true, true);
}
TEST_F(CodecOwnerTest, NoCngAndRedNoSpeechEncoderReset) {
TestCngAndRedResetSpeechEncoder(false, false);
}
TEST_F(CodecOwnerTest, SetEncodersError) {
CodecInst codec_inst = kDefaultCodecInst;
static const char bad_name[] = "Robert'); DROP TABLE Students;";
std::memcpy(codec_inst.plname, bad_name, sizeof bad_name);
EXPECT_FALSE(codec_owner_.SetEncoders(codec_inst, -1, VADNormal, -1));
}
} // namespace acm2
} // namespace webrtc
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