214 lines
7.1 KiB
C++
214 lines
7.1 KiB
C++
/*
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* Copyright 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define LOG_TAG "ScreenRecord"
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//#define LOG_NDEBUG 0
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#include <utils/Log.h>
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#include <GLES2/gl2.h>
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#include <GLES2/gl2ext.h>
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#include "FrameOutput.h"
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using namespace android;
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static const bool kShowTiming = false; // set to "true" for debugging
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static const int kGlBytesPerPixel = 4; // GL_RGBA
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static const int kOutBytesPerPixel = 3; // RGB only
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inline void FrameOutput::setValueLE(uint8_t* buf, uint32_t value) {
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// Since we're running on an Android device, we're (almost) guaranteed
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// to be little-endian, and (almost) guaranteed that unaligned 32-bit
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// writes will work without any performance penalty... but do it
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// byte-by-byte anyway.
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buf[0] = (uint8_t) value;
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buf[1] = (uint8_t) (value >> 8);
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buf[2] = (uint8_t) (value >> 16);
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buf[3] = (uint8_t) (value >> 24);
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}
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status_t FrameOutput::createInputSurface(int width, int height,
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sp<IGraphicBufferProducer>* pBufferProducer) {
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status_t err;
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err = mEglWindow.createPbuffer(width, height);
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if (err != NO_ERROR) {
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return err;
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}
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mEglWindow.makeCurrent();
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glViewport(0, 0, width, height);
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glDisable(GL_DEPTH_TEST);
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glDisable(GL_CULL_FACE);
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// Shader for rendering the external texture.
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err = mExtTexProgram.setup(Program::PROGRAM_EXTERNAL_TEXTURE);
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if (err != NO_ERROR) {
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return err;
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}
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// Input side (buffers from virtual display).
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glGenTextures(1, &mExtTextureName);
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if (mExtTextureName == 0) {
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ALOGE("glGenTextures failed: %#x", glGetError());
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return UNKNOWN_ERROR;
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}
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sp<IGraphicBufferProducer> producer;
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sp<IGraphicBufferConsumer> consumer;
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BufferQueue::createBufferQueue(&producer, &consumer);
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mGlConsumer = new GLConsumer(consumer, mExtTextureName,
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GL_TEXTURE_EXTERNAL_OES, true, false);
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mGlConsumer->setName(String8("virtual display"));
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mGlConsumer->setDefaultBufferSize(width, height);
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producer->setMaxDequeuedBufferCount(4);
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mGlConsumer->setConsumerUsageBits(GRALLOC_USAGE_HW_TEXTURE);
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mGlConsumer->setFrameAvailableListener(this);
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mPixelBuf = new uint8_t[width * height * kGlBytesPerPixel];
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*pBufferProducer = producer;
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ALOGD("FrameOutput::createInputSurface OK");
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return NO_ERROR;
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}
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status_t FrameOutput::copyFrame(FILE* fp, long timeoutUsec, bool rawFrames) {
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Mutex::Autolock _l(mMutex);
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ALOGV("copyFrame %ld\n", timeoutUsec);
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if (!mFrameAvailable) {
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nsecs_t timeoutNsec = (nsecs_t)timeoutUsec * 1000;
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int cc = mEventCond.waitRelative(mMutex, timeoutNsec);
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if (cc == -ETIMEDOUT) {
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ALOGV("cond wait timed out");
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return ETIMEDOUT;
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} else if (cc != 0) {
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ALOGW("cond wait returned error %d", cc);
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return cc;
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}
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}
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if (!mFrameAvailable) {
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// This happens when Ctrl-C is hit. Apparently POSIX says that the
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// pthread wait call doesn't return EINTR, treating this instead as
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// an instance of a "spurious wakeup". We didn't get a frame, so
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// we just treat it as a timeout.
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return ETIMEDOUT;
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}
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// A frame is available. Clear the flag for the next round.
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mFrameAvailable = false;
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float texMatrix[16];
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mGlConsumer->updateTexImage();
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mGlConsumer->getTransformMatrix(texMatrix);
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// The data is in an external texture, so we need to render it to the
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// pbuffer to get access to RGB pixel data. We also want to flip it
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// upside-down for easy conversion to a bitmap.
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int width = mEglWindow.getWidth();
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int height = mEglWindow.getHeight();
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status_t err = mExtTexProgram.blit(mExtTextureName, texMatrix, 0, 0,
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width, height, true);
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if (err != NO_ERROR) {
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return err;
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}
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// GLES only guarantees that glReadPixels() will work with GL_RGBA, so we
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// need to get 4 bytes/pixel and reduce it. Depending on the size of the
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// screen and the device capabilities, this can take a while.
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int64_t startWhenNsec, pixWhenNsec, endWhenNsec;
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if (kShowTiming) {
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startWhenNsec = systemTime(CLOCK_MONOTONIC);
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}
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GLenum glErr;
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glReadPixels(0, 0, width, height, GL_RGBA, GL_UNSIGNED_BYTE, mPixelBuf);
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if ((glErr = glGetError()) != GL_NO_ERROR) {
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ALOGE("glReadPixels failed: %#x", glErr);
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return UNKNOWN_ERROR;
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}
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if (kShowTiming) {
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pixWhenNsec = systemTime(CLOCK_MONOTONIC);
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}
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reduceRgbaToRgb(mPixelBuf, width * height);
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if (kShowTiming) {
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endWhenNsec = systemTime(CLOCK_MONOTONIC);
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ALOGD("got pixels (get=%.3f ms, reduce=%.3fms)",
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(pixWhenNsec - startWhenNsec) / 1000000.0,
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(endWhenNsec - pixWhenNsec) / 1000000.0);
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}
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size_t rgbDataLen = width * height * kOutBytesPerPixel;
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if (!rawFrames) {
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// Fill out the header.
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size_t headerLen = sizeof(uint32_t) * 5;
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size_t packetLen = headerLen - sizeof(uint32_t) + rgbDataLen;
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uint8_t header[headerLen];
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setValueLE(&header[0], packetLen);
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setValueLE(&header[4], width);
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setValueLE(&header[8], height);
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setValueLE(&header[12], width * kOutBytesPerPixel);
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setValueLE(&header[16], HAL_PIXEL_FORMAT_RGB_888);
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fwrite(header, 1, headerLen, fp);
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}
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// Currently using buffered I/O rather than writev(). Not expecting it
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// to make much of a difference, but it might be worth a test for larger
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// frame sizes.
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if (kShowTiming) {
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startWhenNsec = systemTime(CLOCK_MONOTONIC);
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}
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fwrite(mPixelBuf, 1, rgbDataLen, fp);
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fflush(fp);
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if (kShowTiming) {
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endWhenNsec = systemTime(CLOCK_MONOTONIC);
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ALOGD("wrote pixels (%.3f ms)",
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(endWhenNsec - startWhenNsec) / 1000000.0);
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}
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if (ferror(fp)) {
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// errno may not be useful; log it anyway
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ALOGE("write failed (errno=%d)", errno);
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return UNKNOWN_ERROR;
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}
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return NO_ERROR;
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}
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void FrameOutput::reduceRgbaToRgb(uint8_t* buf, unsigned int pixelCount) {
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// Convert RGBA to RGB.
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//
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// Unaligned 32-bit accesses are allowed on ARM, so we could do this
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// with 32-bit copies advancing at different rates (taking care at the
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// end to not go one byte over).
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const uint8_t* readPtr = buf;
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for (unsigned int i = 0; i < pixelCount; i++) {
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*buf++ = *readPtr++;
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*buf++ = *readPtr++;
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*buf++ = *readPtr++;
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readPtr++;
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}
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}
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// Callback; executes on arbitrary thread.
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void FrameOutput::onFrameAvailable(const BufferItem& /* item */) {
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Mutex::Autolock _l(mMutex);
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mFrameAvailable = true;
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mEventCond.signal();
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}
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