/include/media/stagefright/VideoSourceDownSampler.h
http://github.com/CyanogenMod/android_frameworks_base · C++ Header · 97 lines · 38 code · 24 blank · 35 comment · 0 complexity · edb4ad2e7d2a58741f8ed5ffc1769261 MD5 · raw file
- /*
- * 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.
- */
- // VideoSourceDownSampler implements the MediaSource interface,
- // downsampling frames provided from a real video source.
- #ifndef VIDEO_SOURCE_DOWN_SAMPLER_H_
- #define VIDEO_SOURCE_DOWN_SAMPLER_H_
- #include <media/stagefright/MediaSource.h>
- #include <utils/RefBase.h>
- namespace android {
- class IMemory;
- class MediaBuffer;
- class MetaData;
- class VideoSourceDownSampler : public MediaSource {
- public:
- virtual ~VideoSourceDownSampler();
- // Constructor:
- // videoSource: The real video source which provides the original frames.
- // width, height: The desired width, height. These should be less than or equal
- // to those of the real video source. We then downsample the original frames to
- // this size.
- VideoSourceDownSampler(const sp<MediaSource> &videoSource,
- int32_t width, int32_t height);
- // MediaSource interface
- virtual status_t start(MetaData *params = NULL);
- virtual status_t stop();
- virtual sp<MetaData> getFormat();
- virtual status_t read(
- MediaBuffer **buffer, const ReadOptions *options = NULL);
- virtual status_t pause();
- private:
- // Reference to the real video source.
- sp<MediaSource> mRealVideoSource;
- // Size of frames to be provided by this source.
- int32_t mWidth;
- int32_t mHeight;
- // Size of frames provided by the real source.
- int32_t mRealSourceWidth;
- int32_t mRealSourceHeight;
- // Down sampling paramters.
- int32_t mDownSampleOffsetX;
- int32_t mDownSampleOffsetY;
- int32_t mDownSampleSkipX;
- int32_t mDownSampleSkipY;
- // True if we need to crop the still video image to get the video frame.
- bool mNeedDownSampling;
- // Meta data. This is a copy of the real source except for the width and
- // height parameters.
- sp<MetaData> mMeta;
- // Computes the offset, skip parameters for downsampling the original frame
- // to the desired size.
- void computeDownSamplingParameters();
- // Downsamples the frame in sourceBuffer to size (mWidth x mHeight). A new
- // buffer is created which stores the downsampled image.
- void downSampleYUVImage(const MediaBuffer &sourceBuffer, MediaBuffer **buffer) const;
- // Disallow these.
- VideoSourceDownSampler(const VideoSourceDownSampler &);
- VideoSourceDownSampler &operator=(const VideoSourceDownSampler &);
- };
- } // namespace android
- #endif // VIDEO_SOURCE_DOWN_SAMPLER_H_