blob: bef74f536a3d5c5d66f55571424726d856b96d02 [file] [log] [blame]
/*
* Copyright 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define LOG_TAG "ScreenRecord"
//#define LOG_NDEBUG 0
#include <utils/Log.h>
#include <GLES2/gl2.h>
#include <GLES2/gl2ext.h>
#include "FrameOutput.h"
using namespace android;
static const bool kShowTiming = false; // set to "true" for debugging
static const int kGlBytesPerPixel = 4; // GL_RGBA
static const int kOutBytesPerPixel = 3; // RGB only
inline void FrameOutput::setValueLE(uint8_t* buf, uint32_t value) {
// Since we're running on an Android device, we're (almost) guaranteed
// to be little-endian, and (almost) guaranteed that unaligned 32-bit
// writes will work without any performance penalty... but do it
// byte-by-byte anyway.
buf[0] = (uint8_t) value;
buf[1] = (uint8_t) (value >> 8);
buf[2] = (uint8_t) (value >> 16);
buf[3] = (uint8_t) (value >> 24);
}
status_t FrameOutput::createInputSurface(int width, int height,
sp<IGraphicBufferProducer>* pBufferProducer) {
status_t err;
err = mEglWindow.createPbuffer(width, height);
if (err != NO_ERROR) {
return err;
}
mEglWindow.makeCurrent();
glViewport(0, 0, width, height);
glDisable(GL_DEPTH_TEST);
glDisable(GL_CULL_FACE);
// Shader for rendering the external texture.
err = mExtTexProgram.setup(Program::PROGRAM_EXTERNAL_TEXTURE);
if (err != NO_ERROR) {
return err;
}
// Input side (buffers from virtual display).
glGenTextures(1, &mExtTextureName);
if (mExtTextureName == 0) {
ALOGE("glGenTextures failed: %#x", glGetError());
return UNKNOWN_ERROR;
}
sp<IGraphicBufferProducer> producer;
sp<IGraphicBufferConsumer> consumer;
BufferQueue::createBufferQueue(&producer, &consumer);
mGlConsumer = new GLConsumer(consumer, mExtTextureName,
GL_TEXTURE_EXTERNAL_OES, true, false);
mGlConsumer->setName(String8("virtual display"));
mGlConsumer->setDefaultBufferSize(width, height);
mGlConsumer->setDefaultMaxBufferCount(5);
mGlConsumer->setConsumerUsageBits(GRALLOC_USAGE_HW_TEXTURE);
mGlConsumer->setFrameAvailableListener(this);
mPixelBuf = new uint8_t[width * height * kGlBytesPerPixel];
*pBufferProducer = producer;
ALOGD("FrameOutput::createInputSurface OK");
return NO_ERROR;
}
status_t FrameOutput::copyFrame(FILE* fp, long timeoutUsec, bool rawFrames) {
Mutex::Autolock _l(mMutex);
ALOGV("copyFrame %ld\n", timeoutUsec);
if (!mFrameAvailable) {
nsecs_t timeoutNsec = (nsecs_t)timeoutUsec * 1000;
int cc = mEventCond.waitRelative(mMutex, timeoutNsec);
if (cc == -ETIMEDOUT) {
ALOGV("cond wait timed out");
return ETIMEDOUT;
} else if (cc != 0) {
ALOGW("cond wait returned error %d", cc);
return cc;
}
}
if (!mFrameAvailable) {
// This happens when Ctrl-C is hit. Apparently POSIX says that the
// pthread wait call doesn't return EINTR, treating this instead as
// an instance of a "spurious wakeup". We didn't get a frame, so
// we just treat it as a timeout.
return ETIMEDOUT;
}
// A frame is available. Clear the flag for the next round.
mFrameAvailable = false;
float texMatrix[16];
mGlConsumer->updateTexImage();
mGlConsumer->getTransformMatrix(texMatrix);
// The data is in an external texture, so we need to render it to the
// pbuffer to get access to RGB pixel data. We also want to flip it
// upside-down for easy conversion to a bitmap.
int width = mEglWindow.getWidth();
int height = mEglWindow.getHeight();
status_t err = mExtTexProgram.blit(mExtTextureName, texMatrix, 0, 0,
width, height, true);
if (err != NO_ERROR) {
return err;
}
// GLES only guarantees that glReadPixels() will work with GL_RGBA, so we
// need to get 4 bytes/pixel and reduce it. Depending on the size of the
// screen and the device capabilities, this can take a while.
int64_t startWhenNsec, pixWhenNsec, endWhenNsec;
if (kShowTiming) {
startWhenNsec = systemTime(CLOCK_MONOTONIC);
}
GLenum glErr;
glReadPixels(0, 0, width, height, GL_RGBA, GL_UNSIGNED_BYTE, mPixelBuf);
if ((glErr = glGetError()) != GL_NO_ERROR) {
ALOGE("glReadPixels failed: %#x", glErr);
return UNKNOWN_ERROR;
}
if (kShowTiming) {
pixWhenNsec = systemTime(CLOCK_MONOTONIC);
}
reduceRgbaToRgb(mPixelBuf, width * height);
if (kShowTiming) {
endWhenNsec = systemTime(CLOCK_MONOTONIC);
ALOGD("got pixels (get=%.3f ms, reduce=%.3fms)",
(pixWhenNsec - startWhenNsec) / 1000000.0,
(endWhenNsec - pixWhenNsec) / 1000000.0);
}
size_t rgbDataLen = width * height * kOutBytesPerPixel;
if (!rawFrames) {
// Fill out the header.
size_t headerLen = sizeof(uint32_t) * 5;
size_t packetLen = headerLen - sizeof(uint32_t) + rgbDataLen;
uint8_t header[headerLen];
setValueLE(&header[0], packetLen);
setValueLE(&header[4], width);
setValueLE(&header[8], height);
setValueLE(&header[12], width * kOutBytesPerPixel);
setValueLE(&header[16], HAL_PIXEL_FORMAT_RGB_888);
fwrite(header, 1, headerLen, fp);
}
// Currently using buffered I/O rather than writev(). Not expecting it
// to make much of a difference, but it might be worth a test for larger
// frame sizes.
if (kShowTiming) {
startWhenNsec = systemTime(CLOCK_MONOTONIC);
}
fwrite(mPixelBuf, 1, rgbDataLen, fp);
fflush(fp);
if (kShowTiming) {
endWhenNsec = systemTime(CLOCK_MONOTONIC);
ALOGD("wrote pixels (%.3f ms)",
(endWhenNsec - startWhenNsec) / 1000000.0);
}
if (ferror(fp)) {
// errno may not be useful; log it anyway
ALOGE("write failed (errno=%d)", errno);
return UNKNOWN_ERROR;
}
return NO_ERROR;
}
void FrameOutput::reduceRgbaToRgb(uint8_t* buf, unsigned int pixelCount) {
// Convert RGBA to RGB.
//
// Unaligned 32-bit accesses are allowed on ARM, so we could do this
// with 32-bit copies advancing at different rates (taking care at the
// end to not go one byte over).
const uint8_t* readPtr = buf;
for (unsigned int i = 0; i < pixelCount; i++) {
*buf++ = *readPtr++;
*buf++ = *readPtr++;
*buf++ = *readPtr++;
readPtr++;
}
}
// Callback; executes on arbitrary thread.
void FrameOutput::onFrameAvailable(const BufferItem& /* item */) {
Mutex::Autolock _l(mMutex);
mFrameAvailable = true;
mEventCond.signal();
}