/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "DummyMediaDataDecoder.h"
#include "AnnexB.h"
#include "H264.h"
#include "MP4Decoder.h"

namespace mozilla {

DummyDataCreator::~DummyDataCreator() {}

DummyMediaDataDecoder::DummyMediaDataDecoder(UniquePtr<DummyDataCreator>&& aCreator,
                                             const nsACString& aDescription,
                                             const CreateDecoderParams& aParams)
  : mCreator(Move(aCreator))
  , mIsH264(MP4Decoder::IsH264(aParams.mConfig.mMimeType))
  , mMaxRefFrames(
      mIsH264
      ? H264::HasSPS(aParams.VideoConfig().mExtraData)
        ? H264::ComputeMaxRefFrames(aParams.VideoConfig().mExtraData)
        : 16
      : 0)
  , mType(aParams.mConfig.GetType())
  , mDescription(aDescription)
{
}

RefPtr<MediaDataDecoder::InitPromise>
DummyMediaDataDecoder::Init()
{
  return InitPromise::CreateAndResolve(mType, __func__);
}

RefPtr<ShutdownPromise>
DummyMediaDataDecoder::Shutdown()
{
  return ShutdownPromise::CreateAndResolve(true, __func__);
}

RefPtr<MediaDataDecoder::DecodePromise>
DummyMediaDataDecoder::Decode(MediaRawData* aSample)
{
  RefPtr<MediaData> data = mCreator->Create(aSample);

  if (!data) {
    return DecodePromise::CreateAndReject(NS_ERROR_OUT_OF_MEMORY, __func__);
  }

  // Frames come out in DTS order but we need to output them in PTS order.
  mReorderQueue.Push(data);

  if (mReorderQueue.Length() > mMaxRefFrames) {
    return DecodePromise::CreateAndResolve(
      DecodedData{ mReorderQueue.Pop().get() }, __func__);
  }
  return DecodePromise::CreateAndResolve(DecodedData(), __func__);
}

RefPtr<MediaDataDecoder::DecodePromise>
DummyMediaDataDecoder::Drain()
{
  DecodedData samples;
  while (!mReorderQueue.IsEmpty()) {
    samples.AppendElement(mReorderQueue.Pop().get());
  }
  return DecodePromise::CreateAndResolve(samples, __func__);
}

RefPtr<MediaDataDecoder::FlushPromise>
DummyMediaDataDecoder::Flush()
{
  mReorderQueue.Clear();
  return FlushPromise::CreateAndResolve(true, __func__);
}

nsCString
DummyMediaDataDecoder::GetDescriptionName() const
{
  return NS_LITERAL_CSTRING("blank media data decoder");
}

MediaDataDecoder::ConversionRequired
DummyMediaDataDecoder::NeedsConversion() const
{
  return mIsH264
         ? ConversionRequired::kNeedAVCC
         : ConversionRequired::kNeedNone;
}

} // namespace mozilla