The Tor Browser: content/media/raw/RawReader.cpp@44a2da4a2ab2

Replace accessor implementation with direct member state manipulation, by
request https://trac.torproject.org/projects/tor/ticket/9701#comment:32

     1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

     2 /* This Source Code Form is subject to the terms of the Mozilla Public

     3  * License, v. 2.0. If a copy of the MPL was not distributed with this

     4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     6 #include "MediaDecoderStateMachine.h"

     7 #include "AbstractMediaDecoder.h"

     8 #include "RawReader.h"

     9 #include "RawDecoder.h"

    10 #include "VideoUtils.h"

    11 #include "nsISeekableStream.h"

    12 #include "gfx2DGlue.h"

    14 using namespace mozilla;

    16 RawReader::RawReader(AbstractMediaDecoder* aDecoder)

    17   : MediaDecoderReader(aDecoder),

    18     mCurrentFrame(0), mFrameSize(0)

    19 {

    20   MOZ_COUNT_CTOR(RawReader);

    21 }

    23 RawReader::~RawReader()

    24 {

    25   MOZ_COUNT_DTOR(RawReader);

    26 }

    28 nsresult RawReader::Init(MediaDecoderReader* aCloneDonor)

    29 {

    30   return NS_OK;

    31 }

    33 nsresult RawReader::ResetDecode()

    34 {

    35   mCurrentFrame = 0;

    36   return MediaDecoderReader::ResetDecode();

    37 }

    39 nsresult RawReader::ReadMetadata(MediaInfo* aInfo,

    40                                  MetadataTags** aTags)

    41 {

    42   NS_ASSERTION(mDecoder->OnDecodeThread(),

    43                "Should be on decode thread.");

    45   MediaResource* resource = mDecoder->GetResource();

    46   NS_ASSERTION(resource, "Decoder has no media resource");

    48   if (!ReadFromResource(resource, reinterpret_cast<uint8_t*>(&mMetadata),

    49                         sizeof(mMetadata)))

    50     return NS_ERROR_FAILURE;

    52   // Validate the header

    53   if (!(mMetadata.headerPacketID == 0 /* Packet ID of 0 for the header*/ &&

    54         mMetadata.codecID == RAW_ID /* "YUV" */ &&

    55         mMetadata.majorVersion == 0 &&

    56         mMetadata.minorVersion == 1))

    57     return NS_ERROR_FAILURE;

    59   CheckedUint32 dummy = CheckedUint32(static_cast<uint32_t>(mMetadata.frameWidth)) *

    60                           static_cast<uint32_t>(mMetadata.frameHeight);

    61   NS_ENSURE_TRUE(dummy.isValid(), NS_ERROR_FAILURE);

    63   if (mMetadata.aspectDenominator == 0 ||

    64       mMetadata.framerateDenominator == 0)

    65     return NS_ERROR_FAILURE; // Invalid data

    67   // Determine and verify frame display size.

    68   float pixelAspectRatio = static_cast<float>(mMetadata.aspectNumerator) /

    69                             mMetadata.aspectDenominator;

    70   nsIntSize display(mMetadata.frameWidth, mMetadata.frameHeight);

    71   ScaleDisplayByAspectRatio(display, pixelAspectRatio);

    72   mPicture = nsIntRect(0, 0, mMetadata.frameWidth, mMetadata.frameHeight);

    73   nsIntSize frameSize(mMetadata.frameWidth, mMetadata.frameHeight);

    74   if (!IsValidVideoRegion(frameSize, mPicture, display)) {

    75     // Video track's frame sizes will overflow. Fail.

    76     return NS_ERROR_FAILURE;

    77   }

    79   mInfo.mVideo.mHasVideo = true;

    80   mInfo.mVideo.mDisplay = display;

    82   mFrameRate = static_cast<float>(mMetadata.framerateNumerator) /

    83                mMetadata.framerateDenominator;

    85   // Make some sanity checks

    86   if (mFrameRate > 45 ||

    87       mFrameRate == 0 ||

    88       pixelAspectRatio == 0 ||

    89       mMetadata.frameWidth > 2000 ||

    90       mMetadata.frameHeight > 2000 ||

    91       mMetadata.chromaChannelBpp != 4 ||

    92       mMetadata.lumaChannelBpp != 8 ||

    93       mMetadata.colorspace != 1 /* 4:2:0 */)

    94     return NS_ERROR_FAILURE;

    96   mFrameSize = mMetadata.frameWidth * mMetadata.frameHeight *

    97     (mMetadata.lumaChannelBpp + mMetadata.chromaChannelBpp) / 8.0 +

    98     sizeof(RawPacketHeader);

   100   int64_t length = resource->GetLength();

   101   if (length != -1) {

   102     ReentrantMonitorAutoEnter autoMonitor(mDecoder->GetReentrantMonitor());

   103     mDecoder->SetMediaDuration(USECS_PER_S *

   104                                       (length - sizeof(RawVideoHeader)) /

   105                                       (mFrameSize * mFrameRate));

   106   }

   108   *aInfo = mInfo;

   110   *aTags = nullptr;

   112   return NS_OK;

   113 }

   115  bool RawReader::DecodeAudioData()

   116 {

   117   NS_ASSERTION(mDecoder->OnStateMachineThread() || mDecoder->OnDecodeThread(),

   118                "Should be on state machine thread or decode thread.");

   119   return false;

   120 }

   122 // Helper method that either reads until it gets aLength bytes

   123 // or returns false

   124 bool RawReader::ReadFromResource(MediaResource *aResource, uint8_t* aBuf,

   125                                    uint32_t aLength)

   126 {

   127   while (aLength > 0) {

   128     uint32_t bytesRead = 0;

   129     nsresult rv;

   131     rv = aResource->Read(reinterpret_cast<char*>(aBuf), aLength, &bytesRead);

   132     NS_ENSURE_SUCCESS(rv, false);

   134     if (bytesRead == 0) {

   135       return false;

   136     }

   138     aLength -= bytesRead;

   139     aBuf += bytesRead;

   140   }

   142   return true;

   143 }

   145 bool RawReader::DecodeVideoFrame(bool &aKeyframeSkip,

   146                                      int64_t aTimeThreshold)

   147 {

   148   NS_ASSERTION(mDecoder->OnDecodeThread(),

   149                "Should be on decode thread.");

   151   // Record number of frames decoded and parsed. Automatically update the

   152   // stats counters using the AutoNotifyDecoded stack-based class.

   153   uint32_t parsed = 0, decoded = 0;

   154   AbstractMediaDecoder::AutoNotifyDecoded autoNotify(mDecoder, parsed, decoded);

   156   if (!mFrameSize)

   157     return false; // Metadata read failed.  We should refuse to play.

   159   int64_t currentFrameTime = USECS_PER_S * mCurrentFrame / mFrameRate;

   160   uint32_t length = mFrameSize - sizeof(RawPacketHeader);

   162   nsAutoArrayPtr<uint8_t> buffer(new uint8_t[length]);

   163   MediaResource* resource = mDecoder->GetResource();

   164   NS_ASSERTION(resource, "Decoder has no media resource");

   166   // We're always decoding one frame when called

   167   while(true) {

   168     RawPacketHeader header;

   170     // Read in a packet header and validate

   171     if (!(ReadFromResource(resource, reinterpret_cast<uint8_t*>(&header),

   172                            sizeof(header))) ||

   173         !(header.packetID == 0xFF && header.codecID == RAW_ID /* "YUV" */)) {

   174       return false;

   175     }

   177     if (!ReadFromResource(resource, buffer, length)) {

   178       return false;

   179     }

   181     parsed++;

   183     if (currentFrameTime >= aTimeThreshold)

   184       break;

   186     mCurrentFrame++;

   187     currentFrameTime += static_cast<double>(USECS_PER_S) / mFrameRate;

   188   }

   190   VideoData::YCbCrBuffer b;

   191   b.mPlanes[0].mData = buffer;

   192   b.mPlanes[0].mStride = mMetadata.frameWidth * mMetadata.lumaChannelBpp / 8.0;

   193   b.mPlanes[0].mHeight = mMetadata.frameHeight;

   194   b.mPlanes[0].mWidth = mMetadata.frameWidth;

   195   b.mPlanes[0].mOffset = b.mPlanes[0].mSkip = 0;

   197   uint32_t cbcrStride = mMetadata.frameWidth * mMetadata.chromaChannelBpp / 8.0;

   199   b.mPlanes[1].mData = buffer + mMetadata.frameHeight * b.mPlanes[0].mStride;

   200   b.mPlanes[1].mStride = cbcrStride;

   201   b.mPlanes[1].mHeight = mMetadata.frameHeight / 2;

   202   b.mPlanes[1].mWidth = mMetadata.frameWidth / 2;

   203   b.mPlanes[1].mOffset = b.mPlanes[1].mSkip = 0;

   205   b.mPlanes[2].mData = b.mPlanes[1].mData + mMetadata.frameHeight * cbcrStride / 2;

   206   b.mPlanes[2].mStride = cbcrStride;

   207   b.mPlanes[2].mHeight = mMetadata.frameHeight / 2;

   208   b.mPlanes[2].mWidth = mMetadata.frameWidth / 2;

   209   b.mPlanes[2].mOffset = b.mPlanes[2].mSkip = 0;

   211   VideoData *v = VideoData::Create(mInfo.mVideo,

   212                                    mDecoder->GetImageContainer(),

   213                                    -1,

   214                                    currentFrameTime,

   215                                    (USECS_PER_S / mFrameRate),

   216                                    b,

   217                                    1, // In raw video every frame is a keyframe

   218                                    -1,

   219                                    ToIntRect(mPicture));

   220   if (!v)

   221     return false;

   223   mVideoQueue.Push(v);

   224   mCurrentFrame++;

   225   decoded++;

   226   currentFrameTime += USECS_PER_S / mFrameRate;

   228   return true;

   229 }

   231 nsresult RawReader::Seek(int64_t aTime, int64_t aStartTime, int64_t aEndTime, int64_t aCurrentTime)

   232 {

   233   NS_ASSERTION(mDecoder->OnDecodeThread(),

   234                "Should be on decode thread.");

   236   MediaResource *resource = mDecoder->GetResource();

   237   NS_ASSERTION(resource, "Decoder has no media resource");

   239   uint32_t frame = mCurrentFrame;

   240   if (aTime >= UINT_MAX)

   241     return NS_ERROR_FAILURE;

   242   mCurrentFrame = aTime * mFrameRate / USECS_PER_S;

   244   CheckedUint32 offset = CheckedUint32(mCurrentFrame) * mFrameSize;

   245   offset += sizeof(RawVideoHeader);

   246   NS_ENSURE_TRUE(offset.isValid(), NS_ERROR_FAILURE);

   248   nsresult rv = resource->Seek(nsISeekableStream::NS_SEEK_SET, offset.value());

   249   NS_ENSURE_SUCCESS(rv, rv);

   251   mVideoQueue.Reset();

   253   while(mVideoQueue.GetSize() == 0) {

   254     bool keyframeSkip = false;

   255     if (!DecodeVideoFrame(keyframeSkip, 0)) {

   256       mCurrentFrame = frame;

   257       return NS_ERROR_FAILURE;

   258     }

   260     {

   261       ReentrantMonitorAutoEnter autoMonitor(mDecoder->GetReentrantMonitor());

   262       if (mDecoder->IsShutdown()) {

   263         mCurrentFrame = frame;

   264         return NS_ERROR_FAILURE;

   265       }

   266     }

   268     nsAutoPtr<VideoData> video(mVideoQueue.PeekFront());

   269     if (video && video->GetEndTime() < aTime) {

   270       mVideoQueue.PopFront();

   271       video = nullptr;

   272     } else {

   273       video.forget();

   274     }

   275   }

   277   return NS_OK;

   278 }

   280 nsresult RawReader::GetBuffered(dom::TimeRanges* aBuffered, int64_t aStartTime)

   281 {

   282   return NS_OK;

   283 }

The Tor Browser / file revision

content/media/raw/RawReader.cpp@44a2da4a2ab2

content/media/raw/RawReader.cpp