Nipun Kwatra | 06a1d61 | 2010-08-30 14:55:55 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2010 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | //#define LOG_NDEBUG 0 |
| 18 | #define LOG_TAG "VideoSourceDownSampler" |
| 19 | |
| 20 | #include <media/stagefright/VideoSourceDownSampler.h> |
| 21 | #include <media/stagefright/MediaBuffer.h> |
| 22 | #include <media/stagefright/MediaDebug.h> |
| 23 | #include <media/stagefright/MetaData.h> |
| 24 | #include <media/stagefright/YUVImage.h> |
| 25 | #include <media/stagefright/YUVCanvas.h> |
| 26 | #include "OMX_Video.h" |
| 27 | |
| 28 | namespace android { |
| 29 | |
| 30 | VideoSourceDownSampler::VideoSourceDownSampler(const sp<MediaSource> &videoSource, |
| 31 | int32_t width, int32_t height) { |
| 32 | LOGV("Construct VideoSourceDownSampler"); |
| 33 | CHECK(width > 0); |
| 34 | CHECK(height > 0); |
| 35 | |
| 36 | mRealVideoSource = videoSource; |
| 37 | mWidth = width; |
| 38 | mHeight = height; |
| 39 | |
| 40 | mMeta = new MetaData(*(mRealVideoSource->getFormat())); |
| 41 | CHECK(mMeta->findInt32(kKeyWidth, &mRealSourceWidth)); |
| 42 | CHECK(mMeta->findInt32(kKeyHeight, &mRealSourceHeight)); |
| 43 | |
| 44 | if ((mWidth != mRealSourceWidth) || (mHeight != mRealSourceHeight)) { |
| 45 | // Change meta data for width and height. |
| 46 | CHECK(mWidth <= mRealSourceWidth); |
| 47 | CHECK(mHeight <= mRealSourceHeight); |
| 48 | |
| 49 | mNeedDownSampling = true; |
| 50 | computeDownSamplingParameters(); |
| 51 | mMeta->setInt32(kKeyWidth, mWidth); |
| 52 | mMeta->setInt32(kKeyHeight, mHeight); |
| 53 | } else { |
| 54 | mNeedDownSampling = false; |
| 55 | } |
| 56 | } |
| 57 | |
| 58 | VideoSourceDownSampler::~VideoSourceDownSampler() { |
| 59 | } |
| 60 | |
| 61 | void VideoSourceDownSampler::computeDownSamplingParameters() { |
| 62 | mDownSampleSkipX = mRealSourceWidth / mWidth; |
| 63 | mDownSampleSkipY = mRealSourceHeight / mHeight; |
| 64 | |
| 65 | mDownSampleOffsetX = mRealSourceWidth - mDownSampleSkipX * mWidth; |
| 66 | mDownSampleOffsetY = mRealSourceHeight - mDownSampleSkipY * mHeight; |
| 67 | } |
| 68 | |
| 69 | void VideoSourceDownSampler::downSampleYUVImage( |
| 70 | const MediaBuffer &sourceBuffer, MediaBuffer **buffer) const { |
| 71 | // find the YUV format |
| 72 | int32_t srcFormat; |
| 73 | CHECK(mMeta->findInt32(kKeyColorFormat, &srcFormat)); |
| 74 | YUVImage::YUVFormat yuvFormat; |
| 75 | if (srcFormat == OMX_COLOR_FormatYUV420SemiPlanar) { |
| 76 | yuvFormat = YUVImage::YUV420SemiPlanar; |
| 77 | } else if (srcFormat == OMX_COLOR_FormatYUV420Planar) { |
| 78 | yuvFormat = YUVImage::YUV420Planar; |
| 79 | } |
| 80 | |
| 81 | // allocate mediaBuffer for down sampled image and setup a canvas. |
| 82 | *buffer = new MediaBuffer(YUVImage::bufferSize(yuvFormat, mWidth, mHeight)); |
| 83 | YUVImage yuvDownSampledImage(yuvFormat, |
| 84 | mWidth, mHeight, |
| 85 | (uint8_t *)(*buffer)->data()); |
| 86 | YUVCanvas yuvCanvasDownSample(yuvDownSampledImage); |
| 87 | |
| 88 | YUVImage yuvImageSource(yuvFormat, |
| 89 | mRealSourceWidth, mRealSourceHeight, |
| 90 | (uint8_t *)sourceBuffer.data()); |
| 91 | yuvCanvasDownSample.downsample(mDownSampleOffsetX, mDownSampleOffsetY, |
| 92 | mDownSampleSkipX, mDownSampleSkipY, |
| 93 | yuvImageSource); |
| 94 | } |
| 95 | |
| 96 | status_t VideoSourceDownSampler::start(MetaData *params) { |
| 97 | LOGV("start"); |
| 98 | return mRealVideoSource->start(); |
| 99 | } |
| 100 | |
| 101 | status_t VideoSourceDownSampler::stop() { |
| 102 | LOGV("stop"); |
| 103 | return mRealVideoSource->stop(); |
| 104 | } |
| 105 | |
| 106 | sp<MetaData> VideoSourceDownSampler::getFormat() { |
| 107 | LOGV("getFormat"); |
| 108 | return mMeta; |
| 109 | } |
| 110 | |
| 111 | status_t VideoSourceDownSampler::read( |
| 112 | MediaBuffer **buffer, const ReadOptions *options) { |
| 113 | LOGV("read"); |
| 114 | MediaBuffer *realBuffer; |
| 115 | status_t err = mRealVideoSource->read(&realBuffer, options); |
| 116 | |
| 117 | if (mNeedDownSampling) { |
| 118 | downSampleYUVImage(*realBuffer, buffer); |
| 119 | |
| 120 | int64_t frameTime; |
| 121 | realBuffer->meta_data()->findInt64(kKeyTime, &frameTime); |
| 122 | (*buffer)->meta_data()->setInt64(kKeyTime, frameTime); |
| 123 | |
| 124 | // We just want this buffer to be deleted when the encoder releases it. |
| 125 | // So don't add a reference to it and set the observer to NULL. |
| 126 | (*buffer)->setObserver(NULL); |
| 127 | |
| 128 | // The original buffer is no longer required. Release it. |
| 129 | realBuffer->release(); |
| 130 | } else { |
| 131 | *buffer = realBuffer; |
| 132 | } |
| 133 | |
| 134 | return err; |
| 135 | } |
| 136 | |
| 137 | status_t VideoSourceDownSampler::pause() { |
| 138 | LOGV("pause"); |
| 139 | return mRealVideoSource->pause(); |
| 140 | } |
| 141 | |
| 142 | } // namespace android |