gecko/content/media/raw/RawReader.cpp

283 lines
8.6 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 "MediaDecoderStateMachine.h"
#include "AbstractMediaDecoder.h"
#include "RawReader.h"
#include "RawDecoder.h"
#include "VideoUtils.h"
using namespace mozilla;
RawReader::RawReader(AbstractMediaDecoder* aDecoder)
: MediaDecoderReader(aDecoder),
mCurrentFrame(0), mFrameSize(0)
{
MOZ_COUNT_CTOR(RawReader);
}
RawReader::~RawReader()
{
MOZ_COUNT_DTOR(RawReader);
}
nsresult RawReader::Init(MediaDecoderReader* aCloneDonor)
{
return NS_OK;
}
nsresult RawReader::ResetDecode()
{
mCurrentFrame = 0;
return MediaDecoderReader::ResetDecode();
}
nsresult RawReader::ReadMetadata(VideoInfo* aInfo,
MetadataTags** aTags)
{
NS_ASSERTION(mDecoder->OnDecodeThread(),
"Should be on decode thread.");
MediaResource* resource = mDecoder->GetResource();
NS_ASSERTION(resource, "Decoder has no media resource");
if (!ReadFromResource(resource, reinterpret_cast<uint8_t*>(&mMetadata),
sizeof(mMetadata)))
return NS_ERROR_FAILURE;
// Validate the header
if (!(mMetadata.headerPacketID == 0 /* Packet ID of 0 for the header*/ &&
mMetadata.codecID == RAW_ID /* "YUV" */ &&
mMetadata.majorVersion == 0 &&
mMetadata.minorVersion == 1))
return NS_ERROR_FAILURE;
CheckedUint32 dummy = CheckedUint32(static_cast<uint32_t>(mMetadata.frameWidth)) *
static_cast<uint32_t>(mMetadata.frameHeight);
NS_ENSURE_TRUE(dummy.isValid(), NS_ERROR_FAILURE);
if (mMetadata.aspectDenominator == 0 ||
mMetadata.framerateDenominator == 0)
return NS_ERROR_FAILURE; // Invalid data
// Determine and verify frame display size.
float pixelAspectRatio = static_cast<float>(mMetadata.aspectNumerator) /
mMetadata.aspectDenominator;
nsIntSize display(mMetadata.frameWidth, mMetadata.frameHeight);
ScaleDisplayByAspectRatio(display, pixelAspectRatio);
mPicture = nsIntRect(0, 0, mMetadata.frameWidth, mMetadata.frameHeight);
nsIntSize frameSize(mMetadata.frameWidth, mMetadata.frameHeight);
if (!VideoInfo::ValidateVideoRegion(frameSize, mPicture, display)) {
// Video track's frame sizes will overflow. Fail.
return NS_ERROR_FAILURE;
}
mInfo.mHasVideo = true;
mInfo.mHasAudio = false;
mInfo.mDisplay = display;
mFrameRate = static_cast<float>(mMetadata.framerateNumerator) /
mMetadata.framerateDenominator;
// Make some sanity checks
if (mFrameRate > 45 ||
mFrameRate == 0 ||
pixelAspectRatio == 0 ||
mMetadata.frameWidth > 2000 ||
mMetadata.frameHeight > 2000 ||
mMetadata.chromaChannelBpp != 4 ||
mMetadata.lumaChannelBpp != 8 ||
mMetadata.colorspace != 1 /* 4:2:0 */)
return NS_ERROR_FAILURE;
mFrameSize = mMetadata.frameWidth * mMetadata.frameHeight *
(mMetadata.lumaChannelBpp + mMetadata.chromaChannelBpp) / 8.0 +
sizeof(RawPacketHeader);
int64_t length = resource->GetLength();
if (length != -1) {
ReentrantMonitorAutoEnter autoMonitor(mDecoder->GetReentrantMonitor());
mDecoder->SetMediaDuration(USECS_PER_S *
(length - sizeof(RawVideoHeader)) /
(mFrameSize * mFrameRate));
}
*aInfo = mInfo;
*aTags = nullptr;
return NS_OK;
}
bool RawReader::DecodeAudioData()
{
NS_ASSERTION(mDecoder->OnStateMachineThread() || mDecoder->OnDecodeThread(),
"Should be on state machine thread or decode thread.");
return false;
}
// Helper method that either reads until it gets aLength bytes
// or returns false
bool RawReader::ReadFromResource(MediaResource *aResource, uint8_t* aBuf,
uint32_t aLength)
{
while (aLength > 0) {
uint32_t bytesRead = 0;
nsresult rv;
rv = aResource->Read(reinterpret_cast<char*>(aBuf), aLength, &bytesRead);
NS_ENSURE_SUCCESS(rv, false);
if (bytesRead == 0) {
return false;
}
aLength -= bytesRead;
aBuf += bytesRead;
}
return true;
}
bool RawReader::DecodeVideoFrame(bool &aKeyframeSkip,
int64_t aTimeThreshold)
{
NS_ASSERTION(mDecoder->OnDecodeThread(),
"Should be on decode thread.");
// Record number of frames decoded and parsed. Automatically update the
// stats counters using the AutoNotifyDecoded stack-based class.
uint32_t parsed = 0, decoded = 0;
AbstractMediaDecoder::AutoNotifyDecoded autoNotify(mDecoder, parsed, decoded);
if (!mFrameSize)
return false; // Metadata read failed. We should refuse to play.
int64_t currentFrameTime = USECS_PER_S * mCurrentFrame / mFrameRate;
uint32_t length = mFrameSize - sizeof(RawPacketHeader);
nsAutoArrayPtr<uint8_t> buffer(new uint8_t[length]);
MediaResource* resource = mDecoder->GetResource();
NS_ASSERTION(resource, "Decoder has no media resource");
// We're always decoding one frame when called
while(true) {
RawPacketHeader header;
// Read in a packet header and validate
if (!(ReadFromResource(resource, reinterpret_cast<uint8_t*>(&header),
sizeof(header))) ||
!(header.packetID == 0xFF && header.codecID == RAW_ID /* "YUV" */)) {
return false;
}
if (!ReadFromResource(resource, buffer, length)) {
return false;
}
parsed++;
if (currentFrameTime >= aTimeThreshold)
break;
mCurrentFrame++;
currentFrameTime += static_cast<double>(USECS_PER_S) / mFrameRate;
}
VideoData::YCbCrBuffer b;
b.mPlanes[0].mData = buffer;
b.mPlanes[0].mStride = mMetadata.frameWidth * mMetadata.lumaChannelBpp / 8.0;
b.mPlanes[0].mHeight = mMetadata.frameHeight;
b.mPlanes[0].mWidth = mMetadata.frameWidth;
b.mPlanes[0].mOffset = b.mPlanes[0].mSkip = 0;
uint32_t cbcrStride = mMetadata.frameWidth * mMetadata.chromaChannelBpp / 8.0;
b.mPlanes[1].mData = buffer + mMetadata.frameHeight * b.mPlanes[0].mStride;
b.mPlanes[1].mStride = cbcrStride;
b.mPlanes[1].mHeight = mMetadata.frameHeight / 2;
b.mPlanes[1].mWidth = mMetadata.frameWidth / 2;
b.mPlanes[1].mOffset = b.mPlanes[1].mSkip = 0;
b.mPlanes[2].mData = b.mPlanes[1].mData + mMetadata.frameHeight * cbcrStride / 2;
b.mPlanes[2].mStride = cbcrStride;
b.mPlanes[2].mHeight = mMetadata.frameHeight / 2;
b.mPlanes[2].mWidth = mMetadata.frameWidth / 2;
b.mPlanes[2].mOffset = b.mPlanes[2].mSkip = 0;
VideoData *v = VideoData::Create(mInfo,
mDecoder->GetImageContainer(),
-1,
currentFrameTime,
currentFrameTime + (USECS_PER_S / mFrameRate),
b,
1, // In raw video every frame is a keyframe
-1,
mPicture);
if (!v)
return false;
mVideoQueue.Push(v);
mCurrentFrame++;
decoded++;
currentFrameTime += USECS_PER_S / mFrameRate;
return true;
}
nsresult RawReader::Seek(int64_t aTime, int64_t aStartTime, int64_t aEndTime, int64_t aCurrentTime)
{
NS_ASSERTION(mDecoder->OnDecodeThread(),
"Should be on decode thread.");
MediaResource *resource = mDecoder->GetResource();
NS_ASSERTION(resource, "Decoder has no media resource");
uint32_t frame = mCurrentFrame;
if (aTime >= UINT_MAX)
return NS_ERROR_FAILURE;
mCurrentFrame = aTime * mFrameRate / USECS_PER_S;
CheckedUint32 offset = CheckedUint32(mCurrentFrame) * mFrameSize;
offset += sizeof(RawVideoHeader);
NS_ENSURE_TRUE(offset.isValid(), NS_ERROR_FAILURE);
nsresult rv = resource->Seek(nsISeekableStream::NS_SEEK_SET, offset.value());
NS_ENSURE_SUCCESS(rv, rv);
mVideoQueue.Erase();
while(mVideoQueue.GetSize() == 0) {
bool keyframeSkip = false;
if (!DecodeVideoFrame(keyframeSkip, 0)) {
mCurrentFrame = frame;
return NS_ERROR_FAILURE;
}
{
ReentrantMonitorAutoEnter autoMonitor(mDecoder->GetReentrantMonitor());
if (mDecoder->IsShutdown()) {
mCurrentFrame = frame;
return NS_ERROR_FAILURE;
}
}
nsAutoPtr<VideoData> video(mVideoQueue.PeekFront());
if (video && video->mEndTime < aTime) {
mVideoQueue.PopFront();
video = nullptr;
} else {
video.forget();
}
}
return NS_OK;
}
nsresult RawReader::GetBuffered(nsTimeRanges* aBuffered, int64_t aStartTime)
{
return NS_OK;
}