设置视频画面比例
之前用的EXOplayer1.0版本的,是GitHub上面别人修改过的一个开源demo,里面直接就集成了画面比例的方法,叫做setScaleType,最近播放器要升级发现原来Exoplayer1.0版本的setScaleType方法对于EXOplayer2.0并不适用后来参考IjkPlayerView的方法,找到了一个叫做setMeasuredDimension()的方法,这个方法相信大家并不陌生哦。这里做下简单介绍吧:setMeasuredDimension(width,height)接受width和height两个参数用于设置当前view的大小。其实说白了设置视频画面比例不就是重新设置view的大小吗?对吧。下面直接贴上设置画面比例的逻辑吧,核心就是如何计算view的宽和高,完了就调用上面的setMeasuredDimension(width,height)方法设置一下即可。
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
Log.i(TAG, "onMeasure " + " [" + this.hashCode() + "] ");
int mVideoRotationDegree = (int) getRotation();
int mVideoWidth = mVideoSize.x;
int mVideoHeight = mVideoSize.y;
Log.i(TAG, "videoWidth = " + mVideoWidth + ", videoHeight = " + mVideoHeight + ", " +
"viewRotation = " + mVideoRotationDegree);
// 如果旋转了90°或270°则宽高测量值进行互换
if (mVideoRotationDegree == 90 || mVideoRotationDegree == 270) {
int tempMeasureSpec = widthMeasureSpec;
widthMeasureSpec = heightMeasureSpec;
heightMeasureSpec = tempMeasureSpec;
}
// 获取默认的测量宽高值
int width = getDefaultSize(mVideoWidth, widthMeasureSpec);
int height = getDefaultSize(mVideoHeight, heightMeasureSpec);
if (mCurrentAspectRatio == AR_MATCH_PARENT) {
// 在 AR_MATCH_PARENT 模式下直接用原始测量值
width = widthMeasureSpec;
height = heightMeasureSpec;
} else if (mVideoWidth > 0 && mVideoHeight > 0) {
int widthSpecMode = View.MeasureSpec.getMode(widthMeasureSpec);
int widthSpecSize = View.MeasureSpec.getSize(widthMeasureSpec);
int heightSpecMode = View.MeasureSpec.getMode(heightMeasureSpec);
int heightSpecSize = View.MeasureSpec.getSize(heightMeasureSpec);
// modify,把&&操作符换为||
if (widthSpecMode == View.MeasureSpec.AT_MOST || heightSpecMode == View.MeasureSpec
.AT_MOST) {
// 测量宽高比,对应的视图的宽高比
float specAspectRatio = (float) widthSpecSize / (float) heightSpecSize;
// 显示宽高比,要显示的视频宽高比
float displayAspectRatio;
// 这里计算显示宽高比
switch (mCurrentAspectRatio) {
case AR_16_9_FIT_PARENT:
// 16:9
displayAspectRatio = 16.0f / 9.0f;
if (mVideoRotationDegree == 90 || mVideoRotationDegree == 270)
displayAspectRatio = 1.0f / displayAspectRatio;
break;
case AR_4_3_FIT_PARENT:
// 4:3
displayAspectRatio = 4.0f / 3.0f;
if (mVideoRotationDegree == 90 || mVideoRotationDegree == 270)
displayAspectRatio = 1.0f / displayAspectRatio;
break;
case AR_ASPECT_FIT_PARENT:
case AR_ASPECT_FILL_PARENT:
case AR_ASPECT_WRAP_CONTENT:
default:
// 按视频来源宽高比
displayAspectRatio = (float) mVideoWidth / (float) mVideoHeight;
// if (mVideoSarNum > 0 && mVideoSarDen > 0)
// displayAspectRatio = displayAspectRatio * mVideoSarNum / mVideoSarDen;
break;
}
// 是否要显示视频宽度比例较大
boolean shouldBeWider = displayAspectRatio > specAspectRatio;
// 这里确定最终宽高
switch (mCurrentAspectRatio) {
case AR_ASPECT_FIT_PARENT:
case AR_16_9_FIT_PARENT:
case AR_4_3_FIT_PARENT:
if (shouldBeWider) {
// too wide, fix width;宽度比较大,固定宽度,使用测量宽度,按显示比例缩放高度
width = widthSpecSize;
height = (int) (width / displayAspectRatio);
} else {
// too high, fix height;高度比较大,固定高度,使用测量高度,按显示比例缩放宽度
height = heightSpecSize;
width = (int) (height * displayAspectRatio);
}
break;
case AR_ASPECT_FILL_PARENT: // 填充满控件模式
if (shouldBeWider) {
// not high enough, fix height;宽度比较大,固定高度,缩放宽度
height = heightSpecSize;
width = (int) (height * displayAspectRatio);
} else {
// not wide enough, fix width;高度比较大,固定宽度,缩放高度
width = widthSpecSize;
height = (int) (width / displayAspectRatio);
}
break;
case AR_ASPECT_WRAP_CONTENT:
default:
if (shouldBeWider) {
// too wide, fix width;和第一个类似,这里取 (mVideoWidth, widthSpecSize) 最小的值
width = Math.min(mVideoWidth, widthSpecSize);
height = (int) (width / displayAspectRatio);
} else {
// too high, fix height
height = Math.min(mVideoHeight, heightSpecSize);
width = (int) (height * displayAspectRatio);
}
break;
}
} else if (widthSpecMode == View.MeasureSpec.EXACTLY && heightSpecMode == View
.MeasureSpec.EXACTLY) {
// the size is fixed
width = widthSpecSize;
height = heightSpecSize;
// for compatibility, we adjust size based on aspect ratio
// 这里做的是缩小某一边的大小以达到和视频原始尺寸的比例
if (mVideoWidth * height < width * mVideoHeight) {
width = height * mVideoWidth / mVideoHeight;
} else if (mVideoWidth * height > width * mVideoHeight) {
height = width * mVideoHeight / mVideoWidth;
}
} else if (widthSpecMode == View.MeasureSpec.EXACTLY) {
// only the width is fixed, adjust the height to match aspect ratio if possible
width = widthSpecSize;
height = width * mVideoHeight / mVideoWidth;
if (heightSpecMode == View.MeasureSpec.AT_MOST && height > heightSpecSize) {
// couldn't match aspect ratio within the constraints,不让高度超出测量高度
height = heightSpecSize;
}
} else if (heightSpecMode == View.MeasureSpec.EXACTLY) {
// only the height is fixed, adjust the width to match aspect ratio if possible
height = heightSpecSize;
width = height * mVideoWidth / mVideoHeight;
if (widthSpecMode == View.MeasureSpec.AT_MOST && width > widthSpecSize) {
// couldn't match aspect ratio within the constraints,不让宽度超出测量宽度
width = widthSpecSize;
}
} else {
// neither the width nor the height are fixed, try to use actual video size
width = mVideoWidth;
height = mVideoHeight;
if (heightSpecMode == View.MeasureSpec.AT_MOST && height > heightSpecSize) {
// too tall, decrease both width and height
height = heightSpecSize;
width = height * mVideoWidth / mVideoHeight;
}
if (widthSpecMode == View.MeasureSpec.AT_MOST && width > widthSpecSize) {
// too wide, decrease both width and height
width = widthSpecSize;
height = width * mVideoHeight / mVideoWidth;
}
}
} else {
// no size yet, just adopt the given spec sizes
}
setMeasuredDimension(width, height);
}
好了,简单吧。下面我还是要强烈安利一下——IjkPlayerView。
目前集成的主要功能:
沉浸式全屏播放,隐藏状态栏和虚拟键如果有的话,用的时候有些需要注意的地方放后面说;
弹幕功能,包括发射弹幕和弹幕基本样式设置:大小、颜色和类型(顶部、底部和滚动弹幕),效果同Bilibili;
竖屏和横屏的切换,其实就是小屏和全屏的切换,提供了重力感应来切换竖横屏功能;
触屏控制,竖直方向左边控制亮度,右边控制声音,水平方向控制播放进度;
三指旋转缩放,当三个手指触屏时就可以进行视频界面的旋转缩放,效果同Bilibili;
视频源切换,可设置流畅、清晰、高清、超清和1080p等5种视频源;
视频宽高比例设置,包括16:9、4:3、视频内嵌填充界面和填充屏幕等4种;
记录上次播放进度的跳转功能;
其它的如截屏功能,电池电量显示,时间显示,播放常亮,跑马灯标题和锁屏处理;
怎么样?还是很全面的吧,应该就差个gif动图截取的功能了,有兴趣的好好学习下吧,O(∩_∩)O~