text: /*
   *  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/L16/audio_decoder_L16.h"
  
  #include "absl/memory/memory.h"
  #include "absl/strings/match.h"
  #include "modules/audio_coding/codecs/pcm16b/audio_decoder_pcm16b.h"
  #include "modules/audio_coding/codecs/pcm16b/pcm16b_common.h"
  #include "rtc_base/numerics/safe_conversions.h"
  
  namespace webrtc {
  
  absl::optional<AudioDecoderL16::Config> AudioDecoderL16::SdpToConfig(
      const SdpAudioFormat& format) {
    Config config;
    config.sample_rate_hz = format.clockrate_hz;
    config.num_channels = rtc::checked_cast<int>(format.num_channels);
    return absl::EqualsIgnoreCase(format.name, "L16") && config.IsOk()
               ? absl::optional<Config>(config)
               : absl::nullopt;
  }
  
  void AudioDecoderL16::AppendSupportedDecoders(
      std::vector<AudioCodecSpec>* specs) {
    Pcm16BAppendSupportedCodecSpecs(specs);
  }
  
  std::unique_ptr<AudioDecoder> AudioDecoderL16::MakeAudioDecoder(
      const Config& config,
      absl::optional<AudioCodecPairId> /*codec_pair_id*/) {
    return config.IsOk() ? absl::make_unique<AudioDecoderPcm16B>(
                               config.sample_rate_hz, config.num_channels)
                         : nullptr;
  }
  
  }  // namespace webrtc
  