ffmpeg - How do I rotate yuv/rgb image using libav -

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i want rotate image decoded using libav h.264 decoder.

i see ffmpeg has option -vf transpose it. want programatically. see there vf_transpose.c in libavfilter looks same thing.

i want know how can exercise in code?

edit:

here sample code use decoding::

avcodec *dechd; avcodeccontext *ctxdecode = null; avframe *picturedecoded; avpacket avpkt;  /* --------     setup    -------- */      avcodec_init();      /* register codecs */     avcodec_register_all();     dechd = avcodec_find_decoder(codec_id_h264);      ctxdecode= avcodec_alloc_context();      avcodec_get_context_defaults(ctxdecode);     ctxdecode->flags2 |= codec_flag2_fast;     ctxdecode->pix_fmt = pix_fmt_yuv420p;     ctxdecode->width = cap_width;     ctxdecode->height = cap_height;      if (avcodec_open(ctxdecode, dechd) < 0)      {         printf("avcodec: not open h.264 decoder\n");         exit(1);     }      picturedecoded= avcodec_alloc_frame();     avcodec_get_frame_defaults(picturedecoded);  /* --------    decode    -------- */      avpkt.size = encoutlen;     avpkt.data = nals[0].p_payload;     len = avcodec_decode_video2(ctxdecode, picturedecoded, &got_picture, &avpkt);      len = avpicture_layout((avpicture *)picturedecoded, ctxdecode->pix_fmt             , cap_width, cap_height, decoderout, pic_size);


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