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/*
* Copyright (C) 2010 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 0
#define LOG_TAG "VideoSourceDownSampler"
#include <media/stagefright/VideoSourceDownSampler.h>
#include <media/stagefright/MediaBuffer.h>
#include <media/stagefright/MediaDebug.h>
#include <media/stagefright/MetaData.h>
#include <media/stagefright/YUVImage.h>
#include <media/stagefright/YUVCanvas.h>
#include "OMX_Video.h"
namespace android {
VideoSourceDownSampler::VideoSourceDownSampler(const sp<MediaSource> &videoSource,
int32_t width, int32_t height) {
ALOGV("Construct VideoSourceDownSampler");
CHECK(width > 0);
CHECK(height > 0);
mRealVideoSource = videoSource;
mWidth = width;
mHeight = height;
mMeta = new MetaData(*(mRealVideoSource->getFormat()));
CHECK(mMeta->findInt32(kKeyWidth, &mRealSourceWidth));
CHECK(mMeta->findInt32(kKeyHeight, &mRealSourceHeight));
if ((mWidth != mRealSourceWidth) || (mHeight != mRealSourceHeight)) {
// Change meta data for width and height.
CHECK(mWidth <= mRealSourceWidth);
CHECK(mHeight <= mRealSourceHeight);
mNeedDownSampling = true;
computeDownSamplingParameters();
mMeta->setInt32(kKeyWidth, mWidth);
mMeta->setInt32(kKeyHeight, mHeight);
} else {
mNeedDownSampling = false;
}
}
VideoSourceDownSampler::~VideoSourceDownSampler() {
}
void VideoSourceDownSampler::computeDownSamplingParameters() {
mDownSampleSkipX = mRealSourceWidth / mWidth;
mDownSampleSkipY = mRealSourceHeight / mHeight;
mDownSampleOffsetX = mRealSourceWidth - mDownSampleSkipX * mWidth;
mDownSampleOffsetY = mRealSourceHeight - mDownSampleSkipY * mHeight;
}
void VideoSourceDownSampler::downSampleYUVImage(
const MediaBuffer &sourceBuffer, MediaBuffer **buffer) const {
// find the YUV format
int32_t srcFormat;
CHECK(mMeta->findInt32(kKeyColorFormat, &srcFormat));
YUVImage::YUVFormat yuvFormat;
if (srcFormat == OMX_COLOR_FormatYUV420SemiPlanar) {
yuvFormat = YUVImage::YUV420SemiPlanar;
} else if (srcFormat == OMX_COLOR_FormatYUV420Planar) {
yuvFormat = YUVImage::YUV420Planar;
}
// allocate mediaBuffer for down sampled image and setup a canvas.
*buffer = new MediaBuffer(YUVImage::bufferSize(yuvFormat, mWidth, mHeight));
YUVImage yuvDownSampledImage(yuvFormat,
mWidth, mHeight,
(uint8_t *)(*buffer)->data());
YUVCanvas yuvCanvasDownSample(yuvDownSampledImage);
YUVImage yuvImageSource(yuvFormat,
mRealSourceWidth, mRealSourceHeight,
(uint8_t *)sourceBuffer.data());
yuvCanvasDownSample.downsample(mDownSampleOffsetX, mDownSampleOffsetY,
mDownSampleSkipX, mDownSampleSkipY,
yuvImageSource);
}
status_t VideoSourceDownSampler::start(MetaData *params) {
ALOGV("start");
return mRealVideoSource->start();
}
status_t VideoSourceDownSampler::stop() {
ALOGV("stop");
return mRealVideoSource->stop();
}
sp<MetaData> VideoSourceDownSampler::getFormat() {
ALOGV("getFormat");
return mMeta;
}
status_t VideoSourceDownSampler::read(
MediaBuffer **buffer, const ReadOptions *options) {
ALOGV("read");
MediaBuffer *realBuffer;
status_t err = mRealVideoSource->read(&realBuffer, options);
if (mNeedDownSampling) {
downSampleYUVImage(*realBuffer, buffer);
int64_t frameTime;
realBuffer->meta_data()->findInt64(kKeyTime, &frameTime);
(*buffer)->meta_data()->setInt64(kKeyTime, frameTime);
// We just want this buffer to be deleted when the encoder releases it.
// So don't add a reference to it and set the observer to NULL.
(*buffer)->setObserver(NULL);
// The original buffer is no longer required. Release it.
realBuffer->release();
} else {
*buffer = realBuffer;
}
return err;
}
status_t VideoSourceDownSampler::pause() {
ALOGV("pause");
return mRealVideoSource->pause();
}
} // namespace android
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