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/*
* Copyright (c) 2024 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 "api/audio_codecs/opus/audio_decoder_opus.h"
#include <cstddef>
#include <memory>
#include <optional>
#include "api/audio_codecs/audio_format.h"
#include "api/environment/environment.h"
#include "api/environment/environment_factory.h"
#include "api/field_trials.h"
#include "test/create_test_field_trials.h"
#include "test/gmock.h"
#include "test/gtest.h"
namespace webrtc {
namespace {
using ::testing::Field;
using ::testing::Optional;
using Config = AudioDecoderOpus::Config;
enum class StereoParam { kUnset, kMono, kStereo };
SdpAudioFormat GetSdpAudioFormat(StereoParam param) {
SdpAudioFormat format("opus", 48000, 2);
switch (param) {
case StereoParam::kUnset:
// Do nothing.
break;
case StereoParam::kMono:
format.parameters.emplace("stereo", "0");
break;
case StereoParam::kStereo:
format.parameters.emplace("stereo", "1");
break;
}
return format;
}
constexpr int kDefaultNumChannels = 1;
constexpr int kAlternativeNumChannels = 2;
TEST(AudioDecoderOpusTest, SdpToConfigDoesNotSetNumChannels) {
const std::optional<Config> config =
AudioDecoderOpus::SdpToConfig(GetSdpAudioFormat(StereoParam::kUnset));
EXPECT_THAT(config, Optional(Field(&Config::num_channels, std::nullopt)));
}
TEST(AudioDecoderOpusTest, SdpToConfigForcesMono) {
const std::optional<Config> config =
AudioDecoderOpus::SdpToConfig(GetSdpAudioFormat(StereoParam::kMono));
EXPECT_THAT(config, Optional(Field(&Config::num_channels, 1)));
}
TEST(AudioDecoderOpusTest, SdpToConfigForcesStereo) {
const std::optional<Config> config =
AudioDecoderOpus::SdpToConfig(GetSdpAudioFormat(StereoParam::kStereo));
EXPECT_THAT(config, Optional(Field(&Config::num_channels, 2)));
}
TEST(AudioDecoderOpusTest, MakeAudioDecoderForcesDefaultNumChannels) {
const Environment env = CreateEnvironment();
auto decoder = AudioDecoderOpus::MakeAudioDecoder(
env, /*config=*/{.num_channels = std::nullopt});
EXPECT_EQ(decoder->Channels(), static_cast<size_t>(kDefaultNumChannels));
}
TEST(AudioDecoderOpusTest, MakeAudioDecoderCannotForceDefaultNumChannels) {
const Environment env = CreateEnvironment();
auto decoder = AudioDecoderOpus::MakeAudioDecoder(
env, /*config=*/{.num_channels = kAlternativeNumChannels});
EXPECT_EQ(decoder->Channels(), static_cast<size_t>(kAlternativeNumChannels));
}
TEST(AudioDecoderOpusTest, MakeAudioDecoderForcesStereo) {
const Environment env =
CreateEnvironment(std::make_unique<FieldTrials>(CreateTestFieldTrials(
"WebRTC-Audio-OpusDecodeStereoByDefault/Enabled/")));
auto decoder = AudioDecoderOpus::MakeAudioDecoder(
env,
/*config=*/{.num_channels = std::nullopt});
EXPECT_EQ(decoder->Channels(), 2u);
}
TEST(AudioDecoderOpusTest, MakeAudioDecoderCannotForceStereo) {
const Environment env =
CreateEnvironment(std::make_unique<FieldTrials>(CreateTestFieldTrials(
"WebRTC-Audio-OpusDecodeStereoByDefault/Enabled/")));
auto decoder =
AudioDecoderOpus::MakeAudioDecoder(env, /*config=*/{.num_channels = 1});
EXPECT_EQ(decoder->Channels(), 1u);
}
} // namespace
} // namespace webrtc
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