1 files changed, 208 insertions, 0 deletions
diff --git a/cmds/screenrecord/FrameOutput.cpp b/cmds/screenrecord/FrameOutput.cpp
new file mode 100644
index 0000000..b5cf2f9
--- /dev/null
+++ b/cmds/screenrecord/FrameOutput.cpp
@@ -0,0 +1,208 @@
+/*
+ * 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;
+    }
+
+    mBufferQueue = new BufferQueue(/*new GraphicBufferAlloc()*/);
+    mGlConsumer = new GLConsumer(mBufferQueue, mExtTextureName,
+                GL_TEXTURE_EXTERNAL_OES);
+    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 = mBufferQueue;
+
+    ALOGD("FrameOutput::createInputSurface OK");
+    return NO_ERROR;
+}
+
+status_t FrameOutput::copyFrame(FILE* fp, long timeoutUsec) {
+    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);
+    }
+
+    // Fill out the header.
+    size_t headerLen = sizeof(uint32_t) * 5;
+    size_t rgbDataLen = width * height * kOutBytesPerPixel;
+    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);
+
+    // 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(header, 1, headerLen, fp);
+    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() {
+    Mutex::Autolock _l(mMutex);
+    mFrameAvailable = true;
+    mEventCond.signal();
+}