/*
 *  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/g722/audio_decoder_g722.h"

#include <memory>
#include <optional>
#include <vector>

#include "absl/strings/match.h"
#include "api/audio_codecs/audio_codec_pair_id.h"
#include "api/audio_codecs/audio_decoder.h"
#include "api/audio_codecs/audio_format.h"
#include "api/field_trials_view.h"
#include "modules/audio_coding/codecs/g722/audio_decoder_g722.h"
#include "rtc_base/checks.h"
#include "rtc_base/numerics/safe_conversions.h"

namespace webrtc {

std::optional<AudioDecoderG722::Config> AudioDecoderG722::SdpToConfig(
    const SdpAudioFormat& format) {
  if (absl::EqualsIgnoreCase(format.name, "G722") &&
      format.clockrate_hz == 8000 &&
      (format.num_channels == 1 || format.num_channels == 2)) {
    return Config{dchecked_cast<int>(format.num_channels)};
  }
  return std::nullopt;
}

void AudioDecoderG722::AppendSupportedDecoders(
    std::vector<AudioCodecSpec>* specs) {
  specs->push_back({{"G722", 8000, 1}, {16000, 1, 64000}});
}

std::unique_ptr<AudioDecoder> AudioDecoderG722::MakeAudioDecoder(
    Config config,
    std::optional<AudioCodecPairId> /*codec_pair_id*/,
    const FieldTrialsView* /* field_trials */) {
  if (!config.IsOk()) {
    RTC_DCHECK_NOTREACHED();
    return nullptr;
  }
  switch (config.num_channels) {
    case 1:
      return std::make_unique<AudioDecoderG722Impl>();
    case 2:
      return std::make_unique<AudioDecoderG722StereoImpl>();
    default:
      RTC_DCHECK_NOTREACHED();
      return nullptr;
  }
}

}  // namespace webrtc