如何将 SurfaceTexture 保存为位图 [英] How to save SurfaceTexture as bitmap

问题描述

当我将视频解码到表面时，我想将我想要的帧保存为位图/jpeg 文件.我不想在屏幕上绘制，只想将 SurfaceTexture 的内容保存为图像文件.

When I decode a video to a surface I want to save the frames i want as bitmap/jpeg files. I don't want to draw on the screen and just want to save the content of the SurfaceTexture as an image file.

推荐答案

你必须渲染纹理.

如果它是普通纹理，并且您使用的是 GLES 2 或更高版本，则可以将其附加到 FBO 并直接从中读取.SurfaceTexture 由外部纹理支持"，并且可能是 GL 驱动程序不支持完整操作集的格式，因此您不能这样做.您需要渲染它，然后读取结果.

If it were a normal texture, and you were using GLES 2 or later, you could attach it to an FBO and read directly from that. A SurfaceTexture is backed by an "external texture", and might be in a format that the GL driver doesn't support a full set of operations on, so you can't do that. You need to render it, and read the result.

FWIW，您保存帧的方式会对性能产生重大影响.一个完整的示例演示了 MediaExtractor、MediaCodec、glReadPixels() 和 PNG 文件创建的使用现在已经在 bigflake 上进行了 (ExtractMpegFramesTest).

FWIW, the way you go about saving the frame can have a significant performance impact. A full example demonstrating the use of MediaExtractor, MediaCodec, glReadPixels(), and PNG file creation is now up on bigflake (ExtractMpegFramesTest).

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