зеркало из https://github.com/mozilla/gecko-dev.git
362 строки
12 KiB
C++
362 строки
12 KiB
C++
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "VideoUtils.h"
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#include "MediaResource.h"
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#include "TimeUnits.h"
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#include "nsMathUtils.h"
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#include "nsSize.h"
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#include "VorbisUtils.h"
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#include "ImageContainer.h"
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#include "SharedThreadPool.h"
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#include "mozilla/Preferences.h"
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#include "mozilla/Base64.h"
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#include "mozilla/Telemetry.h"
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#include "nsIRandomGenerator.h"
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#include "nsIServiceManager.h"
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#include "MediaTaskQueue.h"
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#include <stdint.h>
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namespace mozilla {
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using layers::PlanarYCbCrImage;
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// Converts from number of audio frames to microseconds, given the specified
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// audio rate.
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CheckedInt64 FramesToUsecs(int64_t aFrames, uint32_t aRate) {
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return (CheckedInt64(aFrames) * USECS_PER_S) / aRate;
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}
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// Converts from microseconds to number of audio frames, given the specified
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// audio rate.
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CheckedInt64 UsecsToFrames(int64_t aUsecs, uint32_t aRate) {
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return (CheckedInt64(aUsecs) * aRate) / USECS_PER_S;
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}
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nsresult SecondsToUsecs(double aSeconds, int64_t& aOutUsecs) {
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if (aSeconds * double(USECS_PER_S) > INT64_MAX) {
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return NS_ERROR_FAILURE;
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}
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aOutUsecs = int64_t(aSeconds * double(USECS_PER_S));
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return NS_OK;
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}
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static int32_t ConditionDimension(float aValue)
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{
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// This will exclude NaNs and too-big values.
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if (aValue > 1.0 && aValue <= INT32_MAX)
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return int32_t(NS_round(aValue));
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return 0;
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}
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void ScaleDisplayByAspectRatio(nsIntSize& aDisplay, float aAspectRatio)
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{
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if (aAspectRatio > 1.0) {
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// Increase the intrinsic width
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aDisplay.width = ConditionDimension(aAspectRatio * aDisplay.width);
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} else {
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// Increase the intrinsic height
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aDisplay.height = ConditionDimension(aDisplay.height / aAspectRatio);
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}
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}
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static int64_t BytesToTime(int64_t offset, int64_t length, int64_t durationUs) {
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NS_ASSERTION(length > 0, "Must have positive length");
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double r = double(offset) / double(length);
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if (r > 1.0)
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r = 1.0;
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return int64_t(double(durationUs) * r);
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}
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media::TimeIntervals GetEstimatedBufferedTimeRanges(mozilla::MediaResource* aStream,
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int64_t aDurationUsecs)
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{
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media::TimeIntervals buffered;
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// Nothing to cache if the media takes 0us to play.
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if (aDurationUsecs <= 0 || !aStream)
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return buffered;
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// Special case completely cached files. This also handles local files.
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if (aStream->IsDataCachedToEndOfResource(0)) {
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buffered +=
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media::TimeInterval(media::TimeUnit::FromMicroseconds(0),
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media::TimeUnit::FromMicroseconds(aDurationUsecs));
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return buffered;
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}
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int64_t totalBytes = aStream->GetLength();
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// If we can't determine the total size, pretend that we have nothing
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// buffered. This will put us in a state of eternally-low-on-undecoded-data
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// which is not great, but about the best we can do.
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if (totalBytes <= 0)
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return buffered;
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int64_t startOffset = aStream->GetNextCachedData(0);
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while (startOffset >= 0) {
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int64_t endOffset = aStream->GetCachedDataEnd(startOffset);
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// Bytes [startOffset..endOffset] are cached.
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NS_ASSERTION(startOffset >= 0, "Integer underflow in GetBuffered");
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NS_ASSERTION(endOffset >= 0, "Integer underflow in GetBuffered");
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int64_t startUs = BytesToTime(startOffset, totalBytes, aDurationUsecs);
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int64_t endUs = BytesToTime(endOffset, totalBytes, aDurationUsecs);
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if (startUs != endUs) {
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buffered +=
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media::TimeInterval(media::TimeUnit::FromMicroseconds(startUs),
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media::TimeUnit::FromMicroseconds(endUs));
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}
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startOffset = aStream->GetNextCachedData(endOffset);
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}
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return buffered;
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}
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int DownmixAudioToStereo(mozilla::AudioDataValue* buffer,
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int channels, uint32_t frames)
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{
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int outChannels;
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outChannels = 2;
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#ifdef MOZ_SAMPLE_TYPE_FLOAT32
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// Downmix matrix. Per-row normalization 1 for rows 3,4 and 2 for rows 5-8.
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static const float dmatrix[6][8][2]= {
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/*3*/{{0.5858f,0},{0.4142f,0.4142f},{0, 0.5858f}},
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/*4*/{{0.4226f,0},{0, 0.4226f},{0.366f,0.2114f},{0.2114f,0.366f}},
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/*5*/{{0.6510f,0},{0.4600f,0.4600f},{0, 0.6510f},{0.5636f,0.3254f},{0.3254f,0.5636f}},
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/*6*/{{0.5290f,0},{0.3741f,0.3741f},{0, 0.5290f},{0.4582f,0.2645f},{0.2645f,0.4582f},{0.3741f,0.3741f}},
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/*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}},
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/*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}},
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};
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// Re-write the buffer with downmixed data
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for (uint32_t i = 0; i < frames; i++) {
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float sampL = 0.0;
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float sampR = 0.0;
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for (int j = 0; j < channels; j++) {
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sampL+=buffer[i*channels+j]*dmatrix[channels-3][j][0];
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sampR+=buffer[i*channels+j]*dmatrix[channels-3][j][1];
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}
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buffer[i*outChannels]=sampL;
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buffer[i*outChannels+1]=sampR;
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}
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#else
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// Downmix matrix. Per-row normalization 1 for rows 3,4 and 2 for rows 5-8.
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// Coefficients in Q14.
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static const int16_t dmatrix[6][8][2]= {
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/*3*/{{9598, 0},{6786,6786},{0, 9598}},
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/*4*/{{6925, 0},{0, 6925},{5997,3462},{3462,5997}},
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/*5*/{{10663,0},{7540,7540},{0, 10663},{9234,5331},{5331,9234}},
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/*6*/{{8668, 0},{6129,6129},{0, 8668},{7507,4335},{4335,7507},{6129,6129}},
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/*7*/{{7459, 0},{5275,5275},{0, 7459},{6460,3731},{3731,6460},{4568,4568},{5275,5275}},
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/*8*/{{6368, 0},{4502,4502},{0, 6368},{5514,3184},{3184,5514},{5514,3184},{3184,5514},{4502,4502}}
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};
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// Re-write the buffer with downmixed data
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for (uint32_t i = 0; i < frames; i++) {
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int32_t sampL = 0;
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int32_t sampR = 0;
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for (int j = 0; j < channels; j++) {
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sampL+=buffer[i*channels+j]*dmatrix[channels-3][j][0];
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sampR+=buffer[i*channels+j]*dmatrix[channels-3][j][1];
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}
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sampL = (sampL + 8192)>>14;
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buffer[i*outChannels] = static_cast<mozilla::AudioDataValue>(MOZ_CLIP_TO_15(sampL));
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sampR = (sampR + 8192)>>14;
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buffer[i*outChannels+1] = static_cast<mozilla::AudioDataValue>(MOZ_CLIP_TO_15(sampR));
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}
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#endif
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return outChannels;
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}
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bool
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IsVideoContentType(const nsCString& aContentType)
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{
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NS_NAMED_LITERAL_CSTRING(video, "video");
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if (FindInReadable(video, aContentType)) {
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return true;
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}
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return false;
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}
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bool
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IsValidVideoRegion(const nsIntSize& aFrame, const nsIntRect& aPicture,
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const nsIntSize& aDisplay)
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{
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return
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aFrame.width <= PlanarYCbCrImage::MAX_DIMENSION &&
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aFrame.height <= PlanarYCbCrImage::MAX_DIMENSION &&
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aFrame.width * aFrame.height <= MAX_VIDEO_WIDTH * MAX_VIDEO_HEIGHT &&
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aFrame.width * aFrame.height != 0 &&
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aPicture.width <= PlanarYCbCrImage::MAX_DIMENSION &&
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aPicture.x < PlanarYCbCrImage::MAX_DIMENSION &&
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aPicture.x + aPicture.width < PlanarYCbCrImage::MAX_DIMENSION &&
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aPicture.height <= PlanarYCbCrImage::MAX_DIMENSION &&
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aPicture.y < PlanarYCbCrImage::MAX_DIMENSION &&
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aPicture.y + aPicture.height < PlanarYCbCrImage::MAX_DIMENSION &&
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aPicture.width * aPicture.height <= MAX_VIDEO_WIDTH * MAX_VIDEO_HEIGHT &&
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aPicture.width * aPicture.height != 0 &&
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aDisplay.width <= PlanarYCbCrImage::MAX_DIMENSION &&
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aDisplay.height <= PlanarYCbCrImage::MAX_DIMENSION &&
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aDisplay.width * aDisplay.height <= MAX_VIDEO_WIDTH * MAX_VIDEO_HEIGHT &&
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aDisplay.width * aDisplay.height != 0;
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}
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TemporaryRef<SharedThreadPool> GetMediaThreadPool(MediaThreadType aType)
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{
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const char *name;
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switch (aType) {
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case MediaThreadType::PLATFORM_DECODER:
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name = "MediaPDecoder";
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break;
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default:
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MOZ_ASSERT(false);
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case MediaThreadType::PLAYBACK:
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name = "MediaPlayback";
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break;
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}
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return SharedThreadPool::
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Get(nsDependentCString(name),
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Preferences::GetUint("media.num-decode-threads", 12));
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}
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bool
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ExtractH264CodecDetails(const nsAString& aCodec,
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int16_t& aProfile,
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int16_t& aLevel)
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{
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// H.264 codecs parameters have a type defined as avcN.PPCCLL, where
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// N = avc type. avc3 is avcc with SPS & PPS implicit (within stream)
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// PP = profile_idc, CC = constraint_set flags, LL = level_idc.
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// We ignore the constraint_set flags, as it's not clear from any
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// documentation what constraints the platform decoders support.
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// See http://blog.pearce.org.nz/2013/11/what-does-h264avc1-codecs-parameters.html
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// for more details.
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if (aCodec.Length() != strlen("avc1.PPCCLL")) {
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return false;
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}
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// Verify the codec starts with "avc1." or "avc3.".
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const nsAString& sample = Substring(aCodec, 0, 5);
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if (!sample.EqualsASCII("avc1.") && !sample.EqualsASCII("avc3.")) {
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return false;
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}
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// Extract the profile_idc and level_idc.
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nsresult rv = NS_OK;
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aProfile = PromiseFlatString(Substring(aCodec, 5, 2)).ToInteger(&rv, 16);
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NS_ENSURE_SUCCESS(rv, false);
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aLevel = PromiseFlatString(Substring(aCodec, 9, 2)).ToInteger(&rv, 16);
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NS_ENSURE_SUCCESS(rv, false);
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if (aLevel == 9) {
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aLevel = H264_LEVEL_1_b;
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} else if (aLevel <= 5) {
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aLevel *= 10;
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}
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// Capture the constraint_set flag value for the purpose of Telemetry.
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// We don't NS_ENSURE_SUCCESS here because ExtractH264CodecDetails doesn't
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// care about this, but we make sure constraints is above 4 (constraint_set5_flag)
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// otherwise collect 0 for unknown.
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uint8_t constraints = PromiseFlatString(Substring(aCodec, 7, 2)).ToInteger(&rv, 16);
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Telemetry::Accumulate(Telemetry::VIDEO_CANPLAYTYPE_H264_CONSTRAINT_SET_FLAG,
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constraints >= 4 ? constraints : 0);
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// 244 is the highest meaningful profile value (High 4:4:4 Intra Profile)
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// that can be represented as single hex byte, otherwise collect 0 for unknown.
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Telemetry::Accumulate(Telemetry::VIDEO_CANPLAYTYPE_H264_PROFILE,
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aProfile <= 244 ? aProfile : 0);
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// Make sure aLevel represents a value between levels 1 and 5.2,
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// otherwise collect 0 for unknown.
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Telemetry::Accumulate(Telemetry::VIDEO_CANPLAYTYPE_H264_LEVEL,
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(aLevel >= 10 && aLevel <= 52) ? aLevel : 0);
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return true;
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}
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nsresult
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GenerateRandomName(nsCString& aOutSalt, uint32_t aLength)
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{
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nsresult rv;
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nsCOMPtr<nsIRandomGenerator> rg =
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do_GetService("@mozilla.org/security/random-generator;1", &rv);
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if (NS_FAILED(rv)) return rv;
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// For each three bytes of random data we will get four bytes of ASCII.
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const uint32_t requiredBytesLength =
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static_cast<uint32_t>((aLength + 3) / 4 * 3);
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uint8_t* buffer;
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rv = rg->GenerateRandomBytes(requiredBytesLength, &buffer);
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if (NS_FAILED(rv)) return rv;
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nsAutoCString temp;
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nsDependentCSubstring randomData(reinterpret_cast<const char*>(buffer),
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requiredBytesLength);
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rv = Base64Encode(randomData, temp);
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free(buffer);
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buffer = nullptr;
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if (NS_FAILED (rv)) return rv;
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aOutSalt = temp;
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return NS_OK;
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}
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nsresult
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GenerateRandomPathName(nsCString& aOutSalt, uint32_t aLength)
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{
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nsresult rv = GenerateRandomName(aOutSalt, aLength);
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if (NS_FAILED(rv)) return rv;
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// Base64 characters are alphanumeric (a-zA-Z0-9) and '+' and '/', so we need
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// to replace illegal characters -- notably '/'
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aOutSalt.ReplaceChar(FILE_PATH_SEPARATOR FILE_ILLEGAL_CHARACTERS, '_');
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return NS_OK;
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}
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class CreateTaskQueueTask : public nsRunnable {
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public:
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NS_IMETHOD Run() {
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MOZ_ASSERT(NS_IsMainThread());
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mTaskQueue =
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new MediaTaskQueue(GetMediaThreadPool(MediaThreadType::PLATFORM_DECODER));
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return NS_OK;
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}
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nsRefPtr<MediaTaskQueue> mTaskQueue;
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};
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class CreateFlushableTaskQueueTask : public nsRunnable {
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public:
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NS_IMETHOD Run() {
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MOZ_ASSERT(NS_IsMainThread());
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mTaskQueue =
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new FlushableMediaTaskQueue(GetMediaThreadPool(MediaThreadType::PLATFORM_DECODER));
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return NS_OK;
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}
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nsRefPtr<FlushableMediaTaskQueue> mTaskQueue;
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};
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already_AddRefed<MediaTaskQueue>
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CreateMediaDecodeTaskQueue()
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{
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// We must create the MediaTaskQueue/SharedThreadPool on the main thread.
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nsRefPtr<CreateTaskQueueTask> t(new CreateTaskQueueTask());
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nsresult rv = NS_DispatchToMainThread(t, NS_DISPATCH_SYNC);
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NS_ENSURE_SUCCESS(rv, nullptr);
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return t->mTaskQueue.forget();
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}
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already_AddRefed<FlushableMediaTaskQueue>
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CreateFlushableMediaDecodeTaskQueue()
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{
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// We must create the MediaTaskQueue/SharedThreadPool on the main thread.
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nsRefPtr<CreateFlushableTaskQueueTask> t(new CreateFlushableTaskQueueTask());
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nsresult rv = NS_DispatchToMainThread(t, NS_DISPATCH_SYNC);
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NS_ENSURE_SUCCESS(rv, nullptr);
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return t->mTaskQueue.forget();
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}
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} // end namespace mozilla
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