зеркало из https://github.com/mozilla/gecko-dev.git
202 строки
7.4 KiB
C++
202 строки
7.4 KiB
C++
/* 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 "VideoUtils.h"
|
|
#include "MediaResource.h"
|
|
#include "mozilla/dom/TimeRanges.h"
|
|
#include "nsMathUtils.h"
|
|
#include "nsSize.h"
|
|
#include "VorbisUtils.h"
|
|
#include "ImageContainer.h"
|
|
#include "SharedThreadPool.h"
|
|
#include "mozilla/Preferences.h"
|
|
|
|
#include <stdint.h>
|
|
|
|
namespace mozilla {
|
|
|
|
using layers::PlanarYCbCrImage;
|
|
|
|
// Converts from number of audio frames to microseconds, given the specified
|
|
// audio rate.
|
|
CheckedInt64 FramesToUsecs(int64_t aFrames, uint32_t aRate) {
|
|
return (CheckedInt64(aFrames) * USECS_PER_S) / aRate;
|
|
}
|
|
|
|
// Converts from microseconds to number of audio frames, given the specified
|
|
// audio rate.
|
|
CheckedInt64 UsecsToFrames(int64_t aUsecs, uint32_t aRate) {
|
|
return (CheckedInt64(aUsecs) * aRate) / USECS_PER_S;
|
|
}
|
|
|
|
nsresult SecondsToUsecs(double aSeconds, int64_t& aOutUsecs) {
|
|
if (aSeconds * double(USECS_PER_S) > INT64_MAX) {
|
|
return NS_ERROR_FAILURE;
|
|
}
|
|
aOutUsecs = int64_t(aSeconds * double(USECS_PER_S));
|
|
return NS_OK;
|
|
}
|
|
|
|
static int32_t ConditionDimension(float aValue)
|
|
{
|
|
// This will exclude NaNs and too-big values.
|
|
if (aValue > 1.0 && aValue <= INT32_MAX)
|
|
return int32_t(NS_round(aValue));
|
|
return 0;
|
|
}
|
|
|
|
void ScaleDisplayByAspectRatio(nsIntSize& aDisplay, float aAspectRatio)
|
|
{
|
|
if (aAspectRatio > 1.0) {
|
|
// Increase the intrinsic width
|
|
aDisplay.width = ConditionDimension(aAspectRatio * aDisplay.width);
|
|
} else {
|
|
// Increase the intrinsic height
|
|
aDisplay.height = ConditionDimension(aDisplay.height / aAspectRatio);
|
|
}
|
|
}
|
|
|
|
static int64_t BytesToTime(int64_t offset, int64_t length, int64_t durationUs) {
|
|
NS_ASSERTION(length > 0, "Must have positive length");
|
|
double r = double(offset) / double(length);
|
|
if (r > 1.0)
|
|
r = 1.0;
|
|
return int64_t(double(durationUs) * r);
|
|
}
|
|
|
|
void GetEstimatedBufferedTimeRanges(mozilla::MediaResource* aStream,
|
|
int64_t aDurationUsecs,
|
|
mozilla::dom::TimeRanges* aOutBuffered)
|
|
{
|
|
// Nothing to cache if the media takes 0us to play.
|
|
if (aDurationUsecs <= 0 || !aStream || !aOutBuffered)
|
|
return;
|
|
|
|
// Special case completely cached files. This also handles local files.
|
|
if (aStream->IsDataCachedToEndOfResource(0)) {
|
|
aOutBuffered->Add(0, double(aDurationUsecs) / USECS_PER_S);
|
|
return;
|
|
}
|
|
|
|
int64_t totalBytes = aStream->GetLength();
|
|
|
|
// If we can't determine the total size, pretend that we have nothing
|
|
// buffered. This will put us in a state of eternally-low-on-undecoded-data
|
|
// which is not great, but about the best we can do.
|
|
if (totalBytes <= 0)
|
|
return;
|
|
|
|
int64_t startOffset = aStream->GetNextCachedData(0);
|
|
while (startOffset >= 0) {
|
|
int64_t endOffset = aStream->GetCachedDataEnd(startOffset);
|
|
// Bytes [startOffset..endOffset] are cached.
|
|
NS_ASSERTION(startOffset >= 0, "Integer underflow in GetBuffered");
|
|
NS_ASSERTION(endOffset >= 0, "Integer underflow in GetBuffered");
|
|
|
|
int64_t startUs = BytesToTime(startOffset, totalBytes, aDurationUsecs);
|
|
int64_t endUs = BytesToTime(endOffset, totalBytes, aDurationUsecs);
|
|
if (startUs != endUs) {
|
|
aOutBuffered->Add(double(startUs) / USECS_PER_S,
|
|
double(endUs) / USECS_PER_S);
|
|
}
|
|
startOffset = aStream->GetNextCachedData(endOffset);
|
|
}
|
|
return;
|
|
}
|
|
|
|
int DownmixAudioToStereo(mozilla::AudioDataValue* buffer,
|
|
int channels, uint32_t frames)
|
|
{
|
|
int outChannels;
|
|
outChannels = 2;
|
|
#ifdef MOZ_SAMPLE_TYPE_FLOAT32
|
|
// Downmix matrix. Per-row normalization 1 for rows 3,4 and 2 for rows 5-8.
|
|
static const float dmatrix[6][8][2]= {
|
|
/*3*/{{0.5858f,0},{0.4142f,0.4142f},{0, 0.5858f}},
|
|
/*4*/{{0.4226f,0},{0, 0.4226f},{0.366f,0.2114f},{0.2114f,0.366f}},
|
|
/*5*/{{0.6510f,0},{0.4600f,0.4600f},{0, 0.6510f},{0.5636f,0.3254f},{0.3254f,0.5636f}},
|
|
/*6*/{{0.5290f,0},{0.3741f,0.3741f},{0, 0.5290f},{0.4582f,0.2645f},{0.2645f,0.4582f},{0.3741f,0.3741f}},
|
|
/*7*/{{0.4553f,0},{0.3220f,0.3220f},{0, 0.4553f},{0.3943f,0.2277f},{0.2277f,0.3943f},{0.2788f,0.2788f},{0.3220f,0.3220f}},
|
|
/*8*/{{0.3886f,0},{0.2748f,0.2748f},{0, 0.3886f},{0.3366f,0.1943f},{0.1943f,0.3366f},{0.3366f,0.1943f},{0.1943f,0.3366f},{0.2748f,0.2748f}},
|
|
};
|
|
// Re-write the buffer with downmixed data
|
|
for (uint32_t i = 0; i < frames; i++) {
|
|
float sampL = 0.0;
|
|
float sampR = 0.0;
|
|
for (int j = 0; j < channels; j++) {
|
|
sampL+=buffer[i*channels+j]*dmatrix[channels-3][j][0];
|
|
sampR+=buffer[i*channels+j]*dmatrix[channels-3][j][1];
|
|
}
|
|
buffer[i*outChannels]=sampL;
|
|
buffer[i*outChannels+1]=sampR;
|
|
}
|
|
#else
|
|
// Downmix matrix. Per-row normalization 1 for rows 3,4 and 2 for rows 5-8.
|
|
// Coefficients in Q14.
|
|
static const int16_t dmatrix[6][8][2]= {
|
|
/*3*/{{9598, 0},{6786,6786},{0, 9598}},
|
|
/*4*/{{6925, 0},{0, 6925},{5997,3462},{3462,5997}},
|
|
/*5*/{{10663,0},{7540,7540},{0, 10663},{9234,5331},{5331,9234}},
|
|
/*6*/{{8668, 0},{6129,6129},{0, 8668},{7507,4335},{4335,7507},{6129,6129}},
|
|
/*7*/{{7459, 0},{5275,5275},{0, 7459},{6460,3731},{3731,6460},{4568,4568},{5275,5275}},
|
|
/*8*/{{6368, 0},{4502,4502},{0, 6368},{5514,3184},{3184,5514},{5514,3184},{3184,5514},{4502,4502}}
|
|
};
|
|
// Re-write the buffer with downmixed data
|
|
for (uint32_t i = 0; i < frames; i++) {
|
|
int32_t sampL = 0;
|
|
int32_t sampR = 0;
|
|
for (int j = 0; j < channels; j++) {
|
|
sampL+=buffer[i*channels+j]*dmatrix[channels-3][j][0];
|
|
sampR+=buffer[i*channels+j]*dmatrix[channels-3][j][1];
|
|
}
|
|
sampL = (sampL + 8192)>>14;
|
|
buffer[i*outChannels] = static_cast<mozilla::AudioDataValue>(MOZ_CLIP_TO_15(sampL));
|
|
sampR = (sampR + 8192)>>14;
|
|
buffer[i*outChannels+1] = static_cast<mozilla::AudioDataValue>(MOZ_CLIP_TO_15(sampR));
|
|
}
|
|
#endif
|
|
return outChannels;
|
|
}
|
|
|
|
bool
|
|
IsVideoContentType(const nsCString& aContentType)
|
|
{
|
|
NS_NAMED_LITERAL_CSTRING(video, "video");
|
|
if (FindInReadable(video, aContentType)) {
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
bool
|
|
IsValidVideoRegion(const nsIntSize& aFrame, const nsIntRect& aPicture,
|
|
const nsIntSize& aDisplay)
|
|
{
|
|
return
|
|
aFrame.width <= PlanarYCbCrImage::MAX_DIMENSION &&
|
|
aFrame.height <= PlanarYCbCrImage::MAX_DIMENSION &&
|
|
aFrame.width * aFrame.height <= MAX_VIDEO_WIDTH * MAX_VIDEO_HEIGHT &&
|
|
aFrame.width * aFrame.height != 0 &&
|
|
aPicture.width <= PlanarYCbCrImage::MAX_DIMENSION &&
|
|
aPicture.x < PlanarYCbCrImage::MAX_DIMENSION &&
|
|
aPicture.x + aPicture.width < PlanarYCbCrImage::MAX_DIMENSION &&
|
|
aPicture.height <= PlanarYCbCrImage::MAX_DIMENSION &&
|
|
aPicture.y < PlanarYCbCrImage::MAX_DIMENSION &&
|
|
aPicture.y + aPicture.height < PlanarYCbCrImage::MAX_DIMENSION &&
|
|
aPicture.width * aPicture.height <= MAX_VIDEO_WIDTH * MAX_VIDEO_HEIGHT &&
|
|
aPicture.width * aPicture.height != 0 &&
|
|
aDisplay.width <= PlanarYCbCrImage::MAX_DIMENSION &&
|
|
aDisplay.height <= PlanarYCbCrImage::MAX_DIMENSION &&
|
|
aDisplay.width * aDisplay.height <= MAX_VIDEO_WIDTH * MAX_VIDEO_HEIGHT &&
|
|
aDisplay.width * aDisplay.height != 0;
|
|
}
|
|
|
|
TemporaryRef<SharedThreadPool> GetMediaDecodeThreadPool()
|
|
{
|
|
return SharedThreadPool::Get(NS_LITERAL_CSTRING("Media Decode"),
|
|
Preferences::GetUint("media.num-decode-threads", 25));
|
|
}
|
|
|
|
} // end namespace mozilla
|