AVPicture中函数功能介绍

最新推荐文章于 2021-02-26 18:57:25 发布

原创最新推荐文章于 2021-02-26 18:57:25 发布 · 4.9k 阅读

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本文详细介绍了FFmpeg中关于图片处理的一系列函数，包括分配、填充、布局计算、大小计算等核心功能。通过这些函数，可以实现图片的内存分配与释放、像素数据的填充与复制等功能。

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int	avpicture_alloc (AVPicture *picture, enum AVPixelFormat pix_fmt, int width, int height)
	Allocate memory for the pixels of a picture and setup the AVPicture fields for it.

void	avpicture_free (AVPicture *picture)//释放内存
	Free a picture previously allocated by avpicture_alloc().

int	avpicture_fill (AVPicture picture, const uint8_t ptr, enum AVPixelFormat pix_fmt, int width, int height)//把ptr和picture以pix_fmt格式关联起来，意思就是指针ptr=picture
	Setup the picture fields based on the specified image parameters and the provided image data buffer.

int	avpicture_layout (const AVPicture src, enum AVPixelFormat pix_fmt, int width, int height, unsigned char dest, int dest_size)
	Copy pixel data from an AVPicture into a buffer.

int	avpicture_get_size (enum AVPixelFormat pix_fmt, int width, int height)//解码后一帧图像的大小
	Calculate the size in bytes that a picture of the given width and height would occupy if stored in the given picture format.

attribute_deprecated int	avpicture_deinterlace (AVPicture dst, const AVPicture src, enum AVPixelFormat pix_fmt, int width, int height)
	deinterlace - if not supported return -1

void	av_picture_copy (AVPicture dst, const AVPicture src, enum AVPixelFormat pix_fmt, int width, int height)
	Copy image src to dst.

int	av_picture_crop (AVPicture dst, const AVPicture src, enum AVPixelFormat pix_fmt, int top_band, int left_band)
	Crop image top and left side.

int	av_picture_pad