/*
 *  Copyright (c) 2018 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/video_codecs/video_decoder.h"

#include "absl/types/optional.h"
#include "api/video/render_resolution.h"
#include "api/video/video_codec_type.h"
#include "rtc_base/checks.h"
#include "rtc_base/strings/string_builder.h"

namespace webrtc {

int32_t DecodedImageCallback::Decoded(VideoFrame& decodedImage,
                                      int64_t decode_time_ms) {
  // The default implementation ignores custom decode time value.
  return Decoded(decodedImage);
}

void DecodedImageCallback::Decoded(VideoFrame& decodedImage,
                                   absl::optional<int32_t> decode_time_ms,
                                   absl::optional<uint8_t> qp) {
  Decoded(decodedImage, decode_time_ms.value_or(-1));
}

VideoDecoder::DecoderInfo VideoDecoder::GetDecoderInfo() const {
  DecoderInfo info;
  info.implementation_name = ImplementationName();
  return info;
}

const char* VideoDecoder::ImplementationName() const {
  return "unknown";
}

std::string VideoDecoder::DecoderInfo::ToString() const {
  char string_buf[2048];
  rtc::SimpleStringBuilder oss(string_buf);

  oss << "DecoderInfo { "
      << "prefers_late_decoding = "
      << "implementation_name = '" << implementation_name << "', "
      << "is_hardware_accelerated = "
      << (is_hardware_accelerated ? "true" : "false") << " }";
  return oss.str();
}

bool VideoDecoder::DecoderInfo::operator==(const DecoderInfo& rhs) const {
  return is_hardware_accelerated == rhs.is_hardware_accelerated &&
         implementation_name == rhs.implementation_name;
}

void VideoDecoder::Settings::set_number_of_cores(int value) {
  RTC_DCHECK_GT(value, 0);
  number_of_cores_ = value;
}

bool VideoDecoder::Configure(const Settings& settings) {
  VideoCodec codec_settings = {};
  codec_settings.buffer_pool_size = settings.buffer_pool_size();
  RenderResolution max_resolution = settings.max_render_resolution();
  if (max_resolution.Valid()) {
    codec_settings.width = max_resolution.Width();
    codec_settings.height = max_resolution.Height();
  }
  codec_settings.codecType = settings.codec_type();
  return InitDecode(&codec_settings, settings.number_of_cores()) >= 0;
}

int32_t VideoDecoder::InitDecode(const VideoCodec* codec_settings,
                                 int32_t number_of_cores) {
  Settings settings;
  if (codec_settings != nullptr) {
    settings.set_buffer_pool_size(codec_settings->buffer_pool_size);
    settings.set_max_render_resolution(
        {codec_settings->width, codec_settings->height});
    settings.set_codec_type(codec_settings->codecType);
  }
  settings.set_number_of_cores(number_of_cores);
  return Configure(settings) ? 0 : -1;
}

}  // namespace webrtc