sparrow.c

   1 /* Copyright (C) <2010> Douglas Bagnall <douglas@halo.gen.nz>
   2  *
   3  * This library is free software; you can redistribute it and/or
   4  * modify it under the terms of the GNU Library General Public
   5  * License as published by the Free Software Foundation; either
   6  * version 2 of the License, or (at your option) any later version.
   7  *
   8  * This library is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * Library General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU Library General Public
  14  * License along with this library; if not, write to the
  15  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  16  * Boston, MA 02111-1307, USA.
  17  */
  18
  19 #include "sparrow.h"
  20 #include "gstsparrow.h"
  21
  22 #include <string.h>
  23 #include <math.h>
  24
  25 /* static functions (via `make cproto`) */
  26 static void change_state(GstSparrow *sparrow, sparrow_state state);
  27
  28
  29 /* set up whatever debugging methods are enabled */
  30 static void
  31 init_debug(GstSparrow *sparrow){
  32   if (!sparrow->debug_frame){
  33     sparrow->debug_frame = malloc_aligned_or_die(MAX(sparrow->in.size, sparrow->out.size));
  34   }
  35 }
  36
  37 /*RNG code */
  38 /*seed with -1 for automatic seed choice */
  39 static void rng_init(GstSparrow *sparrow, guint32 seed){
  40   GST_DEBUG("in RNG init\n");
  41   if (seed == (guint32)-1){
  42     /* XXX should really use /dev/urandom */
  43     seed = rand() ^ (size_t)&(sparrow);
  44     GST_DEBUG("Real seed %u\n", seed);
  45   }
  46   if (seed == 0)
  47     seed = 12345;
  48
  49   dsfmt_init_gen_rand(sparrow->dsfmt, seed);
  50   dsfmt_gen_rand_all(sparrow->dsfmt);
  51   GST_DEBUG("RNG seeded with %u\n", seed);
  52 }
  53
  54 /** debugging: write frames out somewhere. **/
  55
  56 /*spit out the frame as a ppm image */
  57 static void
  58 ppm_dump(sparrow_format *rgb, guint8 *data, guint32 width, guint32 height, char *name)
  59 {
  60   guint i;
  61   FILE *fh = fopen(name, "w");
  62   guint32 size = width * height;
  63   fprintf(fh, "P6\n%u %u\n255\n", width, height);
  64   /* 4 cases: xBGR xRGB BGRx RGBx
  65      need to convert to 24bit R G B
  66      XX maybe could optimise some cases?
  67   */
  68   guint32 *p = (guint32 *)data;
  69   for (i = 0; i < size; i++){
  70     putc((*p >> rgb->rshift) & 255, fh);
  71     putc((*p >> rgb->gshift) & 255, fh);
  72     putc((*p >> rgb->bshift) & 255, fh);
  73     p++;
  74   }
  75   fflush(fh);
  76   fclose(fh);
  77 }
  78
  79 /*pgm for greyscale */
  80 static void
  81 pgm_dump(guint8 *data, guint32 width, guint32 height, char *name)
  82 {
  83   FILE *fh = fopen(name, "w");
  84   size_t size = width * height;
  85   fprintf(fh, "P5\n%u %u\n255\n", width, height);
  86   size_t wrote = fwrite(data, 1, size, fh);
  87   if (wrote != size){
  88     GST_DEBUG("wanted to write %u bytes; fwrite said %u\n", size, wrote);
  89   }
  90   fflush(fh);
  91   fclose(fh);
  92 }
  93
  94
  95 #define PPM_FILENAME_TEMPLATE "/tmp/sparrow_%05d.%s"
  96 #define PPM_FILENAME_LENGTH (sizeof(PPM_FILENAME_TEMPLATE) + 15)
  97
  98 void INVISIBLE
  99 debug_frame(GstSparrow *sparrow, guint8 *data, guint32 width, guint32 height, int pixsize){
 100   char name[PPM_FILENAME_LENGTH];
 101   int res;
 102   if (pixsize == 4){ /*rgb*/
 103     res = snprintf(name, PPM_FILENAME_LENGTH, PPM_FILENAME_TEMPLATE, sparrow->frame_count, "ppm");
 104     if (res > 0){
 105       ppm_dump(&(sparrow->in), data, width, height, name);
 106     }
 107   }
 108   else {/*greyscale*/
 109     res = snprintf(name, PPM_FILENAME_LENGTH, PPM_FILENAME_TEMPLATE, sparrow->frame_count, "pgm");
 110     if (res > 0){
 111       pgm_dump(data, width, height, name);
 112     }
 113   }
 114 }
 115
 116 /** interpret gst attributes **/
 117
 118 /* Extract a colour (R,G,B) bitmask from gobject  */
 119 static guint32 get_mask(GstStructure *s, char *mask_name){
 120   gint32 mask;
 121   int res = gst_structure_get_int(s, mask_name, &mask);
 122   if (!res){
 123     GST_WARNING("No mask for '%s' !\n", mask_name);
 124   }
 125   return (guint32)mask;
 126 }
 127
 128 static void
 129 extract_caps(sparrow_format *im, GstCaps *caps)
 130 {
 131   GstStructure *s = gst_caps_get_structure (caps, 0);
 132   gst_structure_get_int(s, "width", &(im->width));
 133   gst_structure_get_int(s, "height", &(im->height));
 134   im->rshift = mask_to_shift(get_mask(s, "red_mask"));
 135   im->gshift = mask_to_shift(get_mask(s, "green_mask"));
 136   im->bshift = mask_to_shift(get_mask(s, "blue_mask"));
 137   /* recalculate shifts as little-endian */
 138   im->rmask = 0xff << im->rshift;
 139   im->gmask = 0xff << im->gshift;
 140   im->bmask = 0xff << im->bshift;
 141
 142   im->pixcount = im->width * im->height;
 143   im->size = im->pixcount * PIXSIZE;
 144   im->colours[SPARROW_WHITE] = im->rmask | im->gmask | im->bmask;
 145   im->colours[SPARROW_GREEN] = im->gmask;
 146   im->colours[SPARROW_MAGENTA] = im->rmask | im->bmask;
 147
 148   GST_DEBUG("\ncaps:\n%" GST_PTR_FORMAT, caps);
 149   GST_DEBUG("shifts: r %u g %u b %u\n", im->rshift, im->gshift, im->bshift);
 150   GST_DEBUG("dimensions: w %u h %u pix %u size %u\n", im->width, im->height,
 151       im->pixcount, im->size);
 152 }
 153
 154
 155
 156 /*Most functions below here are called from gstsparrow.c and are NOT static */
 157
 158 /* called by gst_sparrow_init(). The source/sink capabilities (and commandline
 159    arguments[?]) are unknown at this stage, so there isn't much useful to do
 160    here.*/
 161 void INVISIBLE
 162 sparrow_pre_init(GstSparrow *sparrow){
 163 }
 164
 165 /* called by gst_sparrow_set_caps(). This sets up everything after gstreamer
 166    has worked out what the pipeline will look like.
 167  */
 168 gboolean INVISIBLE
 169 sparrow_init(GstSparrow *sparrow, GstCaps *incaps, GstCaps *outcaps){
 170   change_state(sparrow, SPARROW_INIT);
 171   extract_caps(&(sparrow->in), incaps);
 172   extract_caps(&(sparrow->out), outcaps);
 173   sparrow_format *in = &(sparrow->in);
 174
 175   sparrow->dsfmt = zalloc_aligned_or_die(sizeof(dsfmt_t));
 176   sparrow->screenmask = malloc_aligned_or_die(in->pixcount);
 177
 178 #if ! USE_FULL_LUT
 179   size_t point_memsize = (sizeof(sparrow_map_path_t) * sparrow->out.pixcount / LINE_PERIOD) + 1;
 180   size_t row_memsize = sizeof(sparrow_map_row_t) * sparrow->out.height + 1;
 181   sparrow->map.point_mem = malloc_aligned_or_die(point_memsize);
 182   sparrow->map.rows = zalloc_aligned_or_die(row_memsize);
 183 #else
 184   size_t lutsize = sizeof(sparrow_map_lut_t) * sparrow->out.pixcount;
 185   sparrow->map_lut = zalloc_aligned_or_die(lutsize);
 186 #endif
 187
 188   sparrow->prev_buffer = gst_buffer_new_and_alloc(in->size);
 189
 190   sparrow->timer_start.tv_sec = 0;
 191   sparrow->timer_stop.tv_sec = 0;
 192
 193   rng_init(sparrow, sparrow->rng_seed);
 194
 195   if (sparrow->debug){
 196     init_debug(sparrow);
 197   }
 198
 199   if (sparrow->rng_seed & 2){/*XXX need better test */
 200     sparrow->colour = SPARROW_GREEN;
 201   }
 202   else {
 203     sparrow->colour = SPARROW_MAGENTA;
 204   }
 205
 206   sparrow->timer_log = (sparrow->use_timer) ? fopen(TIMER_LOG_FILE, "w") : NULL;
 207
 208   if(sparrow->reload){
 209     change_state(sparrow, SPARROW_FIND_EDGES);
 210   }
 211   else {
 212     change_state(sparrow, SPARROW_NEXT_STATE);
 213   }
 214   return TRUE;
 215 }
 216
 217 void INVISIBLE
 218 sparrow_finalise(GstSparrow *sparrow)
 219 {
 220   free(sparrow->dsfmt);
 221   free(sparrow->screenmask);
 222 #if ! USE_FULL_LUT
 223   free(sparrow->map.point_mem);
 224   free(sparrow->map.rows);
 225 #else
 226   free(sparrow->map_lut);
 227 #endif
 228
 229
 230   if (sparrow->timer_log){
 231     fclose(sparrow->timer_log);
 232   }
 233   //free everything
 234   //cvReleaseImageHeader(IplImage** image)
 235 }
 236
 237
 238 /* initialisation functions and sparrow_transform() use this to set up a new
 239    state. */
 240 static void
 241 change_state(GstSparrow *sparrow, sparrow_state state)
 242 {
 243   GST_DEBUG("state is %d, sparrow->state is %d\n", state, sparrow->state);
 244   switch(sparrow->state){
 245   case SPARROW_FIND_SELF:
 246     finalise_find_self(sparrow);
 247     break;
 248   case SPARROW_FIND_SCREEN:
 249     finalise_find_screen(sparrow);
 250     break;
 251   case SPARROW_FIND_EDGES:
 252     finalise_find_edges(sparrow);
 253     break;
 254   case SPARROW_PLAY:
 255     finalise_play(sparrow);
 256     break;
 257   case SPARROW_INIT:
 258     break;
 259   default:
 260     GST_DEBUG("change_state got unknown state: %d\n", state);
 261   }
 262   if (state == SPARROW_NEXT_STATE){
 263     state = sparrow->state + 1;
 264   }
 265   switch(state){
 266   case SPARROW_FIND_SELF:
 267     init_find_self(sparrow);
 268     break;
 269   case SPARROW_FIND_SCREEN:
 270     init_find_screen(sparrow);
 271     break;
 272   case SPARROW_FIND_EDGES:
 273     init_find_edges(sparrow);
 274     break;
 275   case SPARROW_PLAY:
 276     init_play(sparrow);
 277     break;
 278   case SPARROW_INIT:
 279     //init_init(sparrow);
 280     break;
 281   default:
 282     GST_DEBUG("change_state got unknown state: %d\n", state);
 283   }
 284   sparrow->state = state;
 285 }
 286
 287
 288 /*called by gst_sparrow_transform_ip every frame.
 289
 290   decide what to do based on sparrow->state. All the processing is done in a
 291   "mode_*" function, which returns a state or SPARROW_STATUS_QUO.  If a state
 292   is returned, then change_state() is called to initialise the state, even if
 293   it is the current state (so states can use this to reset).
 294 */
 295 void INVISIBLE
 296 sparrow_transform(GstSparrow *sparrow, guint8 *in, guint8 *out)
 297 {
 298   sparrow_state new_state;
 299 #if TIME_TRANSFORM
 300   TIMER_START(sparrow);
 301 #endif
 302   //GST_DEBUG("in %p, out %p\n", in, out);
 303   switch(sparrow->state){
 304   case SPARROW_FIND_SELF:
 305     new_state = mode_find_self(sparrow, in, out);
 306     break;
 307   case SPARROW_FIND_SCREEN:
 308     new_state = mode_find_screen(sparrow, in, out);
 309     break;
 310   case SPARROW_FIND_EDGES:
 311     new_state = mode_find_edges(sparrow, in, out);
 312     break;
 313   case SPARROW_PLAY:
 314     new_state = mode_play(sparrow, in, out);
 315   default:
 316     GST_DEBUG("unknown state:%d\n", sparrow->state);
 317     new_state = SPARROW_STATUS_QUO;
 318   }
 319   sparrow->frame_count++;
 320   if (new_state != SPARROW_STATUS_QUO){
 321     change_state(sparrow, new_state);
 322   }
 323 #if TIME_TRANSFORM
 324   TIMER_STOP(sparrow);
 325 #endif
 326 }
 327