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/*
* Copyright (C) 2011 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_NDEBUG 1
#define LOG_TAG "PreviewRenderer"
#include <utils/Log.h>
#include "PreviewRenderer.h"
#include <media/stagefright/foundation/ADebug.h>
#include <gui/Surface.h>
namespace android {
PreviewRenderer* PreviewRenderer::CreatePreviewRenderer (
const sp<Surface> &surface, size_t width, size_t height) {
PreviewRenderer* renderer = new PreviewRenderer(surface, width, height);
if (renderer->init() != 0) {
delete renderer;
return NULL;
}
return renderer;
}
PreviewRenderer::PreviewRenderer(
const sp<Surface> &surface,
size_t width, size_t height)
: mSurface(surface),
mWidth(width),
mHeight(height) {
}
int PreviewRenderer::init() {
int err = 0;
ANativeWindow* anw = mSurface.get();
err = native_window_api_connect(anw, NATIVE_WINDOW_API_CPU);
if (err) goto fail;
err = native_window_set_usage(
anw, GRALLOC_USAGE_SW_READ_NEVER | GRALLOC_USAGE_SW_WRITE_OFTEN);
if (err) goto fail;
err = native_window_set_buffer_count(anw, 3);
if (err) goto fail;
err = native_window_set_scaling_mode(
anw, NATIVE_WINDOW_SCALING_MODE_SCALE_TO_WINDOW);
if (err) goto fail;
err = native_window_set_buffers_geometry(
anw, mWidth, mHeight, HAL_PIXEL_FORMAT_YV12);
if (err) goto fail;
err = native_window_set_buffers_transform(anw, 0);
if (err) goto fail;
fail:
return err;
}
PreviewRenderer::~PreviewRenderer() {
native_window_api_disconnect(mSurface.get(), NATIVE_WINDOW_API_CPU);
}
//
// Provides a buffer and associated stride
// This buffer is allocated by the SurfaceFlinger
//
// For optimal display performances, you should :
// 1) call getBufferYV12()
// 2) fill the buffer with your data
// 3) call renderYV12() to take these changes into account
//
// For each call to getBufferYV12(), you must also call renderYV12()
// Expected format in the buffer is YV12 formats (similar to YUV420 planar fromat)
// for more details on this YV12 cf hardware/libhardware/include/hardware/hardware.h
//
void PreviewRenderer::getBufferYV12(uint8_t **data, size_t *stride) {
int err = OK;
if ((err = native_window_dequeue_buffer_and_wait(mSurface.get(),
&mBuf)) != 0) {
ALOGW("native_window_dequeue_buffer_and_wait returned error %d", err);
return;
}
GraphicBufferMapper &mapper = GraphicBufferMapper::get();
Rect bounds(mWidth, mHeight);
void *dst;
CHECK_EQ(0, mapper.lock(mBuf->handle,
GRALLOC_USAGE_SW_READ_NEVER | GRALLOC_USAGE_SW_WRITE_OFTEN,
bounds, &dst));
*data = (uint8_t*)dst;
*stride = mBuf->stride;
}
//
// Display the content of the buffer provided by last call to getBufferYV12()
//
// See getBufferYV12() for details.
//
void PreviewRenderer::renderYV12() {
int err = OK;
GraphicBufferMapper &mapper = GraphicBufferMapper::get();
if (mBuf!= NULL) {
CHECK_EQ(0, mapper.unlock(mBuf->handle));
if ((err = mSurface->ANativeWindow::queueBuffer(mSurface.get(), mBuf, -1)) != 0) {
ALOGW("Surface::queueBuffer returned error %d", err);
}
}
mBuf = NULL;
}
} // namespace android
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