| /* |
| * Copyright (c) 2017 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 <memory> |
| #include <utility> |
| #include <vector> |
| |
| #include "absl/memory/memory.h" |
| #include "common_types.h" // NOLINT(build/include) |
| #include "modules/audio_coding/codecs/opus/audio_decoder_opus.h" |
| |
| namespace webrtc { |
| |
| absl::optional<AudioDecoderOpus::Config> AudioDecoderOpus::SdpToConfig( |
| const SdpAudioFormat& format) { |
| const auto num_channels = [&]() -> absl::optional<int> { |
| auto stereo = format.parameters.find("stereo"); |
| if (stereo != format.parameters.end()) { |
| if (stereo->second == "0") { |
| return 1; |
| } else if (stereo->second == "1") { |
| return 2; |
| } else { |
| return absl::nullopt; // Bad stereo parameter. |
| } |
| } |
| return 1; // Default to mono. |
| }(); |
| if (STR_CASE_CMP(format.name.c_str(), "opus") == 0 && |
| format.clockrate_hz == 48000 && format.num_channels == 2 && |
| num_channels) { |
| return Config{*num_channels}; |
| } else { |
| return absl::nullopt; |
| } |
| } |
| |
| void AudioDecoderOpus::AppendSupportedDecoders( |
| std::vector<AudioCodecSpec>* specs) { |
| AudioCodecInfo opus_info{48000, 1, 64000, 6000, 510000}; |
| opus_info.allow_comfort_noise = false; |
| opus_info.supports_network_adaption = true; |
| SdpAudioFormat opus_format( |
| {"opus", 48000, 2, {{"minptime", "10"}, {"useinbandfec", "1"}}}); |
| specs->push_back({std::move(opus_format), std::move(opus_info)}); |
| } |
| |
| std::unique_ptr<AudioDecoder> AudioDecoderOpus::MakeAudioDecoder( |
| Config config, |
| absl::optional<AudioCodecPairId> /*codec_pair_id*/) { |
| return absl::make_unique<AudioDecoderOpusImpl>(config.num_channels); |
| } |
| |
| } // namespace webrtc |