FFmpeg scale and format convert YUV data

ffmpeg scale and format convert YUV data
The following code is a code that implements a change in the width or YUV format of YUV with FFmpeg.
For example: 352*288->720*576 (with double three or bilinear difference), yuv420p->yuv422p

int videoscaleyuvzoom (int is_flip,int in_width, int in_height,int in_pix_fmt, int out_width, int out_height,int ou t_pix_fmt,uint8_t * buf) {//////////////////////////////////////////////////////////////////////////AVFrame *
	Pinputframe = NULL;
	Avframe * Poutputframe = NULL; static int sws_flags = Sws_bicubic;
	Difference algorithm, dual three-time struct swscontext * img_convert_ctx = NULL;
	uint8_t * m_pvideooutput_zoombuf = NULL;

	int m_pvideooutput_zoomsize = 0; 
	Assign a avframe and set the default value-Enter Pinputframe = Avcodec_alloc_frame ();
		if (Pinputframe = = NULL) {printf ("Assign Pinputframe frame failed \ n");
	return-1; 
	}//Assign a avframe and set the default value-Output Poutputframe = Avcodec_alloc_frame ();
		if (Poutputframe = = NULL) {printf ("Failed to assign picture frame \ n");
	return-1;
	} m_pvideooutput_zoomsize = Avpicture_get_size ((avpixelformat) out_pix_fmt, out_width,out_height); M_pvideooutput_zoombuf = (uint8_t *) calloc (1,m_pvideooutput_zoomsize * 3 * sizeof (char)); The maximum allocated space, can meet the various formats of YUV Avpicture_fill ((avpicture *) Poutputframe, (Unsigned char *) M_pvideooutput_zoombuf, (Avpixelformat) out_pix_fmt,out_width, out_height); Memory Association//Set conversion context if (Img_convert_ctx = = NULL) {img_convert_ctx = Sws_getcontext (In_width, In_height, (AV
		PixelFormat) in_pix_fmt, Out_width, Out_height, (Avpixelformat) out_pix_fmt, sws_flags, NULL, NULL, NULL);
			if (Img_convert_ctx = = NULL) {fprintf (stderr, "Cannot initialize the conversion context\n");
		return-1; }}////////////////////////////////////////////////////////////////////////////Start Conversion Avpicture_fill ((Avpicture *) Pinputframe, (unsigned char *) buf, (Avpixelformat) in_pix_fmt,in_width, in_height);  Memory Association//Camera image inversion problem if (Is_flip) {if ((avpixelformat) in_pix_fmt = = Av_pix_fmt_bgr24 | | RGB Series (avpixelformat) in_pix_fmt = = av_pix_fmt_rgb24) {pinputframe->data[0] + = pinputframe->linesize[0]*
			(in_height-1);
		Pinputframe->linesize[0] *=-1; } else if ((avpixelformat) in_pix_fmt = = av_pix_fmt_yuv420p)//yuv420 Series {PinputFrame->data[0] + = pinputframe->linesize[0]* (in_height-1);
			Pinputframe->linesize[0] *=-1;
			PINPUTFRAME->DATA[1] + = pinputframe->linesize[1]* (IN_HEIGHT/2-1);
			PINPUTFRAME->LINESIZE[1] *=-1;
			PINPUTFRAME->DATA[2] + = pinputframe->linesize[2]* (IN_HEIGHT/2-1);
		PINPUTFRAME->LINESIZE[2] *=-1; } else {//extensible}} Sws_scale (Img_convert_ctx, Pinputframe->data, pinputframe->linesize, 0, I

	N_height, Poutputframe->data, poutputframe->linesize);

	Return the newly converted video to memcpy (buf,m_pvideooutput_zoombuf,m_pvideooutput_zoomsize); if (pinputframe) {Avcodec_free_frame (&
		Amp;pinputframe);
	Pinputframe = NULL;
		} if (Poutputframe) {avcodec_free_frame (&poutputframe);
	Poutputframe = NULL;
	} if (M_pvideooutput_zoombuf) {free (M_PVIDEOOUTPUT_ZOOMBUF);
		} if (Img_convert_ctx) {sws_freecontext (IMG_CONVERT_CTX);
	Img_convert_ctx = NULL;
}	return m_pvideooutput_zoomsize; }

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