libmpcodecs/vf_screenshot.c

   1 #include "config.h"
   2
   3 #include <stdio.h>
   4 #include <stdlib.h>
   5 #if HAVE_MALLOC_H
   6 #include <malloc.h>
   7 #endif
   8 #include <string.h>
   9 #include <inttypes.h>
  10
  11 #include <sys/types.h>
  12 #include <sys/stat.h>
  13 #include <unistd.h>
  14
  15 #include "mp_msg.h"
  16
  17 #include "img_format.h"
  18 #include "mp_image.h"
  19 #include "vf.h"
  20 #include "vf_scale.h"
  21
  22 #include "libswscale/swscale.h"
  23 #include "libavcodec/avcodec.h"
  24
  25 struct vf_priv_s {
  26     int frameno;
  27     char fname[102];
  28     /// shot stores current screenshot mode:
  29     /// 0: don't take screenshots
  30     /// 1: take single screenshot, reset to 0 afterwards
  31     /// 2: take screenshots of each frame
  32     int shot, store_slices;
  33     int dw, dh, stride;
  34     uint8_t *buffer;
  35     struct SwsContext *ctx;
  36     AVCodecContext *avctx;
  37     uint8_t *outbuffer;
  38     int outbuffer_size;
  39 };
  40
  41 //===========================================================================//
  42
  43 static int config(struct vf_instance* vf,
  44                   int width, int height, int d_width, int d_height,
  45                   unsigned int flags, unsigned int outfmt)
  46 {
  47     vf->priv->ctx=sws_getContextFromCmdLine(width, height, outfmt,
  48                                  d_width, d_height, IMGFMT_RGB24);
  49
  50     vf->priv->outbuffer_size = d_width * d_height * 3 * 2;
  51     vf->priv->outbuffer = realloc(vf->priv->outbuffer, vf->priv->outbuffer_size);
  52     vf->priv->avctx->width = d_width;
  53     vf->priv->avctx->height = d_height;
  54     vf->priv->avctx->pix_fmt = PIX_FMT_RGB24;
  55     vf->priv->avctx->compression_level = 0;
  56     vf->priv->dw = d_width;
  57     vf->priv->dh = d_height;
  58     vf->priv->stride = (3*vf->priv->dw+15)&~15;
  59
  60     if (vf->priv->buffer) free(vf->priv->buffer); // probably reconfigured
  61     vf->priv->buffer = NULL;
  62
  63     return vf_next_config(vf,width,height,d_width,d_height,flags,outfmt);
  64 }
  65
  66 static void write_png(struct vf_priv_s *priv)
  67 {
  68     char *fname = priv->fname;
  69     FILE * fp;
  70     AVFrame pic;
  71     int size;
  72
  73     fp = fopen (fname, "wb");
  74     if (fp == NULL) {
  75         mp_msg(MSGT_VFILTER,MSGL_ERR,"\nPNG Error opening %s for writing!\n", fname);
  76         return;
  77     }
  78
  79     pic.data[0] = priv->buffer;
  80     pic.linesize[0] = priv->stride;
  81     size = avcodec_encode_video(priv->avctx, priv->outbuffer, priv->outbuffer_size, &pic);
  82     if (size > 0)
  83         fwrite(priv->outbuffer, size, 1, fp);
  84
  85     fclose (fp);
  86 }
  87
  88 static int fexists(char *fname)
  89 {
  90     struct stat dummy;
  91     if (stat(fname, &dummy) == 0) return 1;
  92     else return 0;
  93 }
  94
  95 static void gen_fname(struct vf_priv_s* priv)
  96 {
  97     do {
  98         snprintf (priv->fname, 100, "shot%04d.png", ++priv->frameno);
  99     } while (fexists(priv->fname) && priv->frameno < 100000);
 100     if (fexists(priv->fname)) {
 101         priv->fname[0] = '\0';
 102         return;
 103     }
 104
 105     mp_msg(MSGT_VFILTER,MSGL_INFO,"*** screenshot '%s' ***\n",priv->fname);
 106
 107 }
 108
 109 static void scale_image(struct vf_priv_s* priv, mp_image_t *mpi)
 110 {
 111     uint8_t *dst[MP_MAX_PLANES] = {NULL};
 112     int dst_stride[MP_MAX_PLANES] = {0};
 113
 114     dst_stride[0] = priv->stride;
 115     if (!priv->buffer)
 116         priv->buffer = memalign(16, dst_stride[0]*priv->dh);
 117
 118     dst[0] = priv->buffer;
 119     sws_scale(priv->ctx, mpi->planes, mpi->stride, 0, priv->dh, dst, dst_stride);
 120 }
 121
 122 static void start_slice(struct vf_instance* vf, mp_image_t *mpi)
 123 {
 124     vf->dmpi=vf_get_image(vf->next,mpi->imgfmt,
 125         mpi->type, mpi->flags, mpi->width, mpi->height);
 126     if (vf->priv->shot) {
 127         vf->priv->store_slices = 1;
 128         if (!vf->priv->buffer)
 129             vf->priv->buffer = memalign(16, vf->priv->stride*vf->priv->dh);
 130     }
 131
 132 }
 133
 134 static void draw_slice(struct vf_instance* vf, unsigned char** src,
 135                        int* stride, int w,int h, int x, int y)
 136 {
 137     if (vf->priv->store_slices) {
 138         uint8_t *dst[MP_MAX_PLANES] = {NULL};
 139         int dst_stride[MP_MAX_PLANES] = {0};
 140         dst_stride[0] = vf->priv->stride;
 141         dst[0] = vf->priv->buffer;
 142         sws_scale(vf->priv->ctx, src, stride, y, h, dst, dst_stride);
 143     }
 144     vf_next_draw_slice(vf,src,stride,w,h,x,y);
 145 }
 146
 147 static void get_image(struct vf_instance* vf, mp_image_t *mpi)
 148 {
 149     // FIXME: should vf.c really call get_image when using slices??
 150     if (mpi->flags & MP_IMGFLAG_DRAW_CALLBACK)
 151       return;
 152     vf->dmpi= vf_get_image(vf->next, mpi->imgfmt,
 153                            mpi->type, mpi->flags/* | MP_IMGFLAG_READABLE*/, mpi->width, mpi->height);
 154
 155     mpi->planes[0]=vf->dmpi->planes[0];
 156     mpi->stride[0]=vf->dmpi->stride[0];
 157     if(mpi->flags&MP_IMGFLAG_PLANAR){
 158         mpi->planes[1]=vf->dmpi->planes[1];
 159         mpi->planes[2]=vf->dmpi->planes[2];
 160         mpi->stride[1]=vf->dmpi->stride[1];
 161         mpi->stride[2]=vf->dmpi->stride[2];
 162     }
 163     mpi->width=vf->dmpi->width;
 164
 165     mpi->flags|=MP_IMGFLAG_DIRECT;
 166
 167     mpi->priv=(void*)vf->dmpi;
 168 }
 169
 170 static int put_image(struct vf_instance* vf, mp_image_t *mpi, double pts)
 171 {
 172     mp_image_t *dmpi = (mp_image_t *)mpi->priv;
 173
 174     if (mpi->flags & MP_IMGFLAG_DRAW_CALLBACK)
 175       dmpi = vf->dmpi;
 176     else
 177     if(!(mpi->flags&MP_IMGFLAG_DIRECT)){
 178         dmpi=vf_get_image(vf->next,mpi->imgfmt,
 179                                     MP_IMGTYPE_EXPORT, 0,
 180                                     mpi->width, mpi->height);
 181         vf_clone_mpi_attributes(dmpi, mpi);
 182         dmpi->planes[0]=mpi->planes[0];
 183         dmpi->planes[1]=mpi->planes[1];
 184         dmpi->planes[2]=mpi->planes[2];
 185         dmpi->stride[0]=mpi->stride[0];
 186         dmpi->stride[1]=mpi->stride[1];
 187         dmpi->stride[2]=mpi->stride[2];
 188         dmpi->width=mpi->width;
 189         dmpi->height=mpi->height;
 190     }
 191
 192     if(vf->priv->shot) {
 193         if (vf->priv->shot==1)
 194             vf->priv->shot=0;
 195         gen_fname(vf->priv);
 196         if (vf->priv->fname[0]) {
 197             if (!vf->priv->store_slices)
 198               scale_image(vf->priv, dmpi);
 199             write_png(vf->priv);
 200         }
 201         vf->priv->store_slices = 0;
 202     }
 203
 204     return vf_next_put_image(vf, dmpi, pts);
 205 }
 206
 207 static int control (vf_instance_t *vf, int request, void *data)
 208 {
 209     /** data contains an integer argument
 210      * 0: take screenshot with the next frame
 211      * 1: take screenshots with each frame until the same command is given once again
 212      **/
 213     if(request==VFCTRL_SCREENSHOT) {
 214         if (data && *(int*)data) { // repeated screenshot mode
 215             if (vf->priv->shot==2)
 216                 vf->priv->shot=0;
 217             else
 218                 vf->priv->shot=2;
 219         } else { // single screenshot
 220             if (!vf->priv->shot)
 221                 vf->priv->shot=1;
 222         }
 223         return CONTROL_TRUE;
 224     }
 225     return vf_next_control (vf, request, data);
 226 }
 227
 228
 229 //===========================================================================//
 230
 231 static int query_format(struct vf_instance* vf, unsigned int fmt)
 232 {
 233     switch(fmt){
 234     case IMGFMT_YV12:
 235     case IMGFMT_I420:
 236     case IMGFMT_IYUV:
 237     case IMGFMT_UYVY:
 238     case IMGFMT_YUY2:
 239     case IMGFMT_BGR32:
 240     case IMGFMT_BGR24:
 241     case IMGFMT_BGR16:
 242     case IMGFMT_BGR15:
 243     case IMGFMT_RGB32:
 244     case IMGFMT_RGB24:
 245     case IMGFMT_Y800:
 246     case IMGFMT_Y8:
 247     case IMGFMT_YVU9:
 248     case IMGFMT_IF09:
 249     case IMGFMT_444P:
 250     case IMGFMT_422P:
 251     case IMGFMT_411P:
 252         return vf_next_query_format(vf, fmt);
 253     }
 254     return 0;
 255 }
 256
 257 static void uninit(vf_instance_t *vf)
 258 {
 259     avcodec_close(vf->priv->avctx);
 260     av_freep(&vf->priv->avctx);
 261     if(vf->priv->ctx) sws_freeContext(vf->priv->ctx);
 262     if (vf->priv->buffer) free(vf->priv->buffer);
 263     free(vf->priv->outbuffer);
 264     free(vf->priv);
 265 }
 266
 267 // open conflicts with stdio.h at least under MinGW
 268 static int screenshot_open(vf_instance_t *vf, char* args)
 269 {
 270     vf->config=config;
 271     vf->control=control;
 272     vf->put_image=put_image;
 273     vf->query_format=query_format;
 274     vf->start_slice=start_slice;
 275     vf->draw_slice=draw_slice;
 276     vf->get_image=get_image;
 277     vf->uninit=uninit;
 278     vf->priv=malloc(sizeof(struct vf_priv_s));
 279     vf->priv->frameno=0;
 280     vf->priv->shot=0;
 281     vf->priv->store_slices=0;
 282     vf->priv->buffer=0;
 283     vf->priv->outbuffer=0;
 284     vf->priv->ctx=0;
 285     vf->priv->avctx = avcodec_alloc_context();
 286     avcodec_register_all();
 287     if (avcodec_open(vf->priv->avctx, avcodec_find_encoder(CODEC_ID_PNG))) {
 288         mp_msg(MSGT_VFILTER, MSGL_FATAL, "Could not open libavcodec PNG encoder\n");
 289         return 0;
 290     }
 291     return 1;
 292 }
 293
 294
 295 const vf_info_t vf_info_screenshot = {
 296     "screenshot to file",
 297     "screenshot",
 298     "A'rpi, Jindrich Makovicka",
 299     "",
 300     screenshot_open,
 301     NULL
 302 };
 303
 304 //===========================================================================//