libavfilter/libmpcodecs/vf_qp.c
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00001 /*
00002  * Copyright (C) 2004 Michael Niedermayer <michaelni@gmx.at>
00003  *
00004  * This file is part of MPlayer.
00005  *
00006  * MPlayer is free software; you can redistribute it and/or modify
00007  * it under the terms of the GNU General Public License as published by
00008  * the Free Software Foundation; either version 2 of the License, or
00009  * (at your option) any later version.
00010  *
00011  * MPlayer is distributed in the hope that it will be useful,
00012  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00013  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00014  * GNU General Public License for more details.
00015  *
00016  * You should have received a copy of the GNU General Public License along
00017  * with MPlayer; if not, write to the Free Software Foundation, Inc.,
00018  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
00019  */
00020 
00021 #include <stdio.h>
00022 #include <stdlib.h>
00023 #include <string.h>
00024 #include <math.h>
00025 #include <inttypes.h>
00026 
00027 #include "mp_msg.h"
00028 #include "cpudetect.h"
00029 #include "img_format.h"
00030 #include "mp_image.h"
00031 #include "vf.h"
00032 #include "libvo/fastmemcpy.h"
00033 
00034 #include "libavcodec/avcodec.h"
00035 #include "libavutil/eval.h"
00036 
00037 
00038 struct vf_priv_s {
00039         char eq[200];
00040         int8_t *qp;
00041         int8_t lut[257];
00042         int qp_stride;
00043 };
00044 
00045 static int config(struct vf_instance *vf,
00046         int width, int height, int d_width, int d_height,
00047         unsigned int flags, unsigned int outfmt){
00048         int h= (height+15)>>4;
00049         int i;
00050 
00051         vf->priv->qp_stride= (width+15)>>4;
00052         vf->priv->qp= av_malloc(vf->priv->qp_stride*h*sizeof(int8_t));
00053 
00054         for(i=-129; i<128; i++){
00055             double const_values[]={
00056                 M_PI,
00057                 M_E,
00058                 i != -129,
00059                 i,
00060                 0
00061             };
00062             static const char *const_names[]={
00063                 "PI",
00064                 "E",
00065                 "known",
00066                 "qp",
00067                 NULL
00068             };
00069             double temp_val;
00070             int res;
00071 
00072             res= av_expr_parse_and_eval(&temp_val, vf->priv->eq, const_names, const_values, NULL, NULL, NULL, NULL, NULL, 0, NULL);
00073 
00074             if (res < 0){
00075                 mp_msg(MSGT_VFILTER, MSGL_ERR, "qp: Error evaluating \"%s\" \n", vf->priv->eq);
00076                 return 0;
00077             }
00078             vf->priv->lut[i+129]= lrintf(temp_val);
00079         }
00080 
00081         return vf_next_config(vf,width,height,d_width,d_height,flags,outfmt);
00082 }
00083 
00084 static void get_image(struct vf_instance *vf, mp_image_t *mpi){
00085     if(mpi->flags&MP_IMGFLAG_PRESERVE) return; // don't change
00086     // ok, we can do pp in-place (or pp disabled):
00087     vf->dmpi=vf_get_image(vf->next,mpi->imgfmt,
00088         mpi->type, mpi->flags, mpi->w, mpi->h);
00089     mpi->planes[0]=vf->dmpi->planes[0];
00090     mpi->stride[0]=vf->dmpi->stride[0];
00091     mpi->width=vf->dmpi->width;
00092     if(mpi->flags&MP_IMGFLAG_PLANAR){
00093         mpi->planes[1]=vf->dmpi->planes[1];
00094         mpi->planes[2]=vf->dmpi->planes[2];
00095         mpi->stride[1]=vf->dmpi->stride[1];
00096         mpi->stride[2]=vf->dmpi->stride[2];
00097     }
00098     mpi->flags|=MP_IMGFLAG_DIRECT;
00099 }
00100 
00101 static int put_image(struct vf_instance *vf, mp_image_t *mpi, double pts){
00102         mp_image_t *dmpi;
00103         int x,y;
00104 
00105         if(!(mpi->flags&MP_IMGFLAG_DIRECT)){
00106                 // no DR, so get a new image! hope we'll get DR buffer:
00107                 vf->dmpi=vf_get_image(vf->next,mpi->imgfmt,
00108                 MP_IMGTYPE_TEMP, MP_IMGFLAG_ACCEPT_STRIDE|MP_IMGFLAG_PREFER_ALIGNED_STRIDE,
00109                 mpi->w,mpi->h);
00110         }
00111 
00112         dmpi= vf->dmpi;
00113 
00114         if(!(mpi->flags&MP_IMGFLAG_DIRECT)){
00115                 memcpy_pic(dmpi->planes[0], mpi->planes[0], mpi->w, mpi->h, dmpi->stride[0], mpi->stride[0]);
00116                     if(mpi->flags&MP_IMGFLAG_PLANAR){
00117                     memcpy_pic(dmpi->planes[1], mpi->planes[1], mpi->w>>mpi->chroma_x_shift, mpi->h>>mpi->chroma_y_shift, dmpi->stride[1], mpi->stride[1]);
00118                     memcpy_pic(dmpi->planes[2], mpi->planes[2], mpi->w>>mpi->chroma_x_shift, mpi->h>>mpi->chroma_y_shift, dmpi->stride[2], mpi->stride[2]);
00119                 }
00120         }
00121         vf_clone_mpi_attributes(dmpi, mpi);
00122 
00123         dmpi->qscale = vf->priv->qp;
00124         dmpi->qstride= vf->priv->qp_stride;
00125         if(mpi->qscale){
00126             for(y=0; y<((dmpi->h+15)>>4); y++){
00127                 for(x=0; x<vf->priv->qp_stride; x++){
00128                     dmpi->qscale[x + dmpi->qstride*y]=
00129                         vf->priv->lut[ 129 + ((int8_t)mpi->qscale[x + mpi->qstride*y]) ];
00130                 }
00131             }
00132         }else{
00133             int qp= vf->priv->lut[0];
00134             for(y=0; y<((dmpi->h+15)>>4); y++){
00135                 for(x=0; x<vf->priv->qp_stride; x++){
00136                     dmpi->qscale[x + dmpi->qstride*y]= qp;
00137                 }
00138             }
00139         }
00140 
00141         return vf_next_put_image(vf,dmpi, pts);
00142 }
00143 
00144 static void uninit(struct vf_instance *vf){
00145         if(!vf->priv) return;
00146 
00147         av_free(vf->priv->qp);
00148         vf->priv->qp= NULL;
00149 
00150         av_free(vf->priv);
00151         vf->priv=NULL;
00152 }
00153 
00154 //===========================================================================//
00155 static int vf_open(vf_instance_t *vf, char *args){
00156     vf->config=config;
00157     vf->put_image=put_image;
00158     vf->get_image=get_image;
00159     vf->uninit=uninit;
00160     vf->priv=av_malloc(sizeof(struct vf_priv_s));
00161     memset(vf->priv, 0, sizeof(struct vf_priv_s));
00162 
00163 //    avcodec_init();
00164 
00165     if (args) strncpy(vf->priv->eq, args, 199);
00166 
00167     return 1;
00168 }
00169 
00170 const vf_info_t vf_info_qp = {
00171     "QP changer",
00172     "qp",
00173     "Michael Niedermayer",
00174     "",
00175     vf_open,
00176     NULL
00177 };