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[vlc] / modules / video_chroma / i420_rgb.c
1 /*****************************************************************************
2  * i420_rgb.c : YUV to bitmap RGB conversion module for vlc
3  *****************************************************************************
4  * Copyright (C) 2000, 2001, 2004 VideoLAN
5  * $Id: i420_rgb.c,v 1.7 2004/01/31 05:53:35 rocky Exp $
6  *
7  * Author: Sam Hocevar <sam@zoy.org>
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 2 of the License, or
12  * (at your option) any later version.
13  *
14  * This program is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17  * GNU General Public License for more details.
18  *
19  * You should have received a copy of the GNU General Public License
20  * along with this program; if not, write to the Free Software
21  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
22  *****************************************************************************/
23
24 /*****************************************************************************
25  * Preamble
26  *****************************************************************************/
27 #include <math.h>                                            /* exp(), pow() */
28 #include <string.h>                                            /* strerror() */
29 #include <stdlib.h>                                      /* malloc(), free() */
30
31 #include <vlc/vlc.h>
32 #include <vlc/vout.h>
33
34 #include "i420_rgb.h"
35 #if defined (MODULE_NAME_IS_i420_rgb)
36 #   include "i420_rgb_c.h"
37 #endif
38
39 /*****************************************************************************
40  * RGB2PIXEL: assemble RGB components to a pixel value, returns a uint32_t
41  *****************************************************************************/
42 #define RGB2PIXEL( p_vout, i_r, i_g, i_b )          \
43     (((((uint32_t)i_r) >> p_vout->output.i_rrshift) \
44                        << p_vout->output.i_lrshift) \
45    | ((((uint32_t)i_g) >> p_vout->output.i_rgshift) \
46                        << p_vout->output.i_lgshift) \
47    | ((((uint32_t)i_b) >> p_vout->output.i_rbshift) \
48                        << p_vout->output.i_lbshift))
49
50 /*****************************************************************************
51  * Local and extern prototypes.
52  *****************************************************************************/
53 static int  Activate   ( vlc_object_t * );
54 static void Deactivate ( vlc_object_t * );
55
56 #if defined (MODULE_NAME_IS_i420_rgb)
57 static void SetGammaTable       ( int *pi_table, double f_gamma );
58 static void SetYUV              ( vout_thread_t * );
59 static void Set8bppPalette      ( vout_thread_t *, uint8_t * );
60 #endif
61
62 /*****************************************************************************
63  * Module descriptor.
64  *****************************************************************************/
65 vlc_module_begin();
66 #if defined (MODULE_NAME_IS_i420_rgb)
67     set_description( _("I420,IYUV,YV12 to "
68                        "RGB2,RV15,RV16,RV24,RV32 conversions") );
69     set_capability( "chroma", 80 );
70 #elif defined (MODULE_NAME_IS_i420_rgb_mmx)
71     set_description( _( "MMX I420,IYUV,YV12 to "
72                         "RV15,RV16,RV24,RV32 conversions") );
73     set_capability( "chroma", 100 );
74     add_requirement( MMX );
75 #endif
76     set_callbacks( Activate, Deactivate );
77 vlc_module_end();
78
79 /*****************************************************************************
80  * Activate: allocate a chroma function
81  *****************************************************************************
82  * This function allocates and initializes a chroma function
83  *****************************************************************************/
84 static int Activate( vlc_object_t *p_this )
85 {
86     vout_thread_t *p_vout = (vout_thread_t *)p_this;
87 #if defined (MODULE_NAME_IS_i420_rgb)
88     size_t i_tables_size;
89 #endif
90
91     if( p_vout->render.i_width & 1 || p_vout->render.i_height & 1 )
92     {
93         return -1;
94     }
95
96     switch( p_vout->render.i_chroma )
97     {
98         case VLC_FOURCC('Y','V','1','2'):
99         case VLC_FOURCC('I','4','2','0'):
100         case VLC_FOURCC('I','Y','U','V'):
101             switch( p_vout->output.i_chroma )
102             {
103 #if defined (MODULE_NAME_IS_i420_rgb)
104                 case VLC_FOURCC('R','G','B','2'):
105                     p_vout->chroma.pf_convert = E_(I420_RGB8);
106                     break;
107 #endif
108                 case VLC_FOURCC('R','V','1','5'):
109                 case VLC_FOURCC('R','V','1','6'):
110 #if defined (MODULE_NAME_IS_i420_rgb_mmx)
111                     /* If we don't have support for the bitmasks, bail out */
112                     if( ( p_vout->output.i_rmask != 0x7c00
113                            || p_vout->output.i_gmask != 0x03e0
114                            || p_vout->output.i_bmask != 0x001f )
115                      && ( p_vout->output.i_rmask != 0xf800
116                            || p_vout->output.i_gmask != 0x07e0
117                            || p_vout->output.i_bmask != 0x001f ) )
118                     {
119                         return -1;
120                     }
121 #endif
122                     p_vout->chroma.pf_convert = E_(I420_RGB16);
123                     break;
124
125 #ifndef WIN32 /* Hmmm, is there only X11 using 32bits per pixel for RV24 ? */
126                 case VLC_FOURCC('R','V','2','4'):
127 #endif
128                 case VLC_FOURCC('R','V','3','2'):
129 #if defined (MODULE_NAME_IS_i420_rgb_mmx)
130                     /* If we don't have support for the bitmasks, bail out */
131                     if( p_vout->output.i_rmask != 0x00ff0000
132                          || p_vout->output.i_gmask != 0x0000ff00
133                          || p_vout->output.i_bmask != 0x000000ff )
134                     {
135                         return -1;
136                     }
137 #endif
138                     p_vout->chroma.pf_convert = E_(I420_RGB32);
139                     break;
140
141                 default:
142                     return -1;
143             }
144             break;
145
146         default:
147             return -1;
148     }
149
150     p_vout->chroma.p_sys = malloc( sizeof( chroma_sys_t ) );
151     if( p_vout->chroma.p_sys == NULL )
152     {
153         return -1;
154     }
155
156     switch( p_vout->output.i_chroma )
157     {
158 #if defined (MODULE_NAME_IS_i420_rgb)
159         case VLC_FOURCC('R','G','B','2'):
160             p_vout->chroma.p_sys->p_buffer = malloc( VOUT_MAX_WIDTH );
161             break;
162 #endif
163
164         case VLC_FOURCC('R','V','1','5'):
165         case VLC_FOURCC('R','V','1','6'):
166             p_vout->chroma.p_sys->p_buffer = malloc( VOUT_MAX_WIDTH * 2 );
167             break;
168
169         case VLC_FOURCC('R','V','2','4'):
170         case VLC_FOURCC('R','V','3','2'):
171             p_vout->chroma.p_sys->p_buffer = malloc( VOUT_MAX_WIDTH * 4 );
172             break;
173
174         default:
175             p_vout->chroma.p_sys->p_buffer = NULL;
176             break;
177     }
178
179     if( p_vout->chroma.p_sys->p_buffer == NULL )
180     {
181         free( p_vout->chroma.p_sys );
182         return -1;
183     }
184
185     p_vout->chroma.p_sys->p_offset = malloc( p_vout->output.i_width
186                     * ( ( p_vout->output.i_chroma
187                            == VLC_FOURCC('R','G','B','2') ) ? 2 : 1 )
188                     * sizeof( int ) );
189     if( p_vout->chroma.p_sys->p_offset == NULL )
190     {
191         free( p_vout->chroma.p_sys->p_buffer );
192         free( p_vout->chroma.p_sys );
193         return -1;
194     }
195
196 #if defined (MODULE_NAME_IS_i420_rgb)
197     switch( p_vout->output.i_chroma )
198     {
199     case VLC_FOURCC('R','G','B','2'):
200         i_tables_size = sizeof( uint8_t ) * PALETTE_TABLE_SIZE;
201         break;
202     case VLC_FOURCC('R','V','1','5'):
203     case VLC_FOURCC('R','V','1','6'):
204         i_tables_size = sizeof( uint16_t ) * RGB_TABLE_SIZE;
205         break;
206     default: /* RV24, RV32 */
207         i_tables_size = sizeof( uint32_t ) * RGB_TABLE_SIZE;
208         break;
209     }
210
211     p_vout->chroma.p_sys->p_base = malloc( i_tables_size );
212     if( p_vout->chroma.p_sys->p_base == NULL )
213     {
214         free( p_vout->chroma.p_sys->p_offset );
215         free( p_vout->chroma.p_sys->p_buffer );
216         free( p_vout->chroma.p_sys );
217         return -1;
218     }
219
220     SetYUV( p_vout );
221 #endif
222
223     return 0;
224 }
225
226 /*****************************************************************************
227  * Deactivate: free the chroma function
228  *****************************************************************************
229  * This function frees the previously allocated chroma function
230  *****************************************************************************/
231 static void Deactivate( vlc_object_t *p_this )
232 {
233     vout_thread_t *p_vout = (vout_thread_t *)p_this;
234
235 #if defined (MODULE_NAME_IS_i420_rgb)
236     free( p_vout->chroma.p_sys->p_base );
237 #endif
238     free( p_vout->chroma.p_sys->p_offset );
239     free( p_vout->chroma.p_sys->p_buffer );
240     free( p_vout->chroma.p_sys );
241 }
242
243 #if defined (MODULE_NAME_IS_i420_rgb)
244 /*****************************************************************************
245  * SetGammaTable: return intensity table transformed by gamma curve.
246  *****************************************************************************
247  * pi_table is a table of 256 entries from 0 to 255.
248  *****************************************************************************/
249 static void SetGammaTable( int *pi_table, double f_gamma )
250 {
251     int i_y;                                               /* base intensity */
252
253     /* Use exp(gamma) instead of gamma */
254     f_gamma = exp( f_gamma );
255
256     /* Build gamma table */
257     for( i_y = 0; i_y < 256; i_y++ )
258     {
259         pi_table[ i_y ] = (int)( pow( (double)i_y / 256, f_gamma ) * 256 );
260     }
261 }
262
263 /*****************************************************************************
264  * SetYUV: compute tables and set function pointers
265  *****************************************************************************/
266 static void SetYUV( vout_thread_t *p_vout )
267 {
268     int         pi_gamma[256];                                /* gamma table */
269     int         i_index;                                  /* index in tables */
270
271     /* Build gamma table */
272     SetGammaTable( pi_gamma, p_vout->f_gamma );
273
274     /*
275      * Set pointers and build YUV tables
276      */
277
278     /* Color: build red, green and blue tables */
279     switch( p_vout->output.i_chroma )
280     {
281     case VLC_FOURCC('R','G','B','2'):
282         p_vout->chroma.p_sys->p_rgb8 = (uint8_t *)p_vout->chroma.p_sys->p_base;
283         Set8bppPalette( p_vout, p_vout->chroma.p_sys->p_rgb8 );
284         break;
285
286     case VLC_FOURCC('R','V','1','5'):
287     case VLC_FOURCC('R','V','1','6'):
288         p_vout->chroma.p_sys->p_rgb16 = (uint16_t *)p_vout->chroma.p_sys->p_base;
289         for( i_index = 0; i_index < RED_MARGIN; i_index++ )
290         {
291             p_vout->chroma.p_sys->p_rgb16[RED_OFFSET - RED_MARGIN + i_index] = RGB2PIXEL( p_vout, pi_gamma[0], 0, 0 );
292             p_vout->chroma.p_sys->p_rgb16[RED_OFFSET + 256 + i_index] =        RGB2PIXEL( p_vout, pi_gamma[255], 0, 0 );
293         }
294         for( i_index = 0; i_index < GREEN_MARGIN; i_index++ )
295         {
296             p_vout->chroma.p_sys->p_rgb16[GREEN_OFFSET - GREEN_MARGIN + i_index] = RGB2PIXEL( p_vout, 0, pi_gamma[0], 0 );
297             p_vout->chroma.p_sys->p_rgb16[GREEN_OFFSET + 256 + i_index] =          RGB2PIXEL( p_vout, 0, pi_gamma[255], 0 );
298         }
299         for( i_index = 0; i_index < BLUE_MARGIN; i_index++ )
300         {
301             p_vout->chroma.p_sys->p_rgb16[BLUE_OFFSET - BLUE_MARGIN + i_index] = RGB2PIXEL( p_vout, 0, 0, pi_gamma[0] );
302             p_vout->chroma.p_sys->p_rgb16[BLUE_OFFSET + BLUE_MARGIN + i_index] = RGB2PIXEL( p_vout, 0, 0, pi_gamma[255] );
303         }
304         for( i_index = 0; i_index < 256; i_index++ )
305         {
306             p_vout->chroma.p_sys->p_rgb16[RED_OFFSET + i_index] =   RGB2PIXEL( p_vout, pi_gamma[ i_index ], 0, 0 );
307             p_vout->chroma.p_sys->p_rgb16[GREEN_OFFSET + i_index] = RGB2PIXEL( p_vout, 0, pi_gamma[ i_index ], 0 );
308             p_vout->chroma.p_sys->p_rgb16[BLUE_OFFSET + i_index] =  RGB2PIXEL( p_vout, 0, 0, pi_gamma[ i_index ] );
309         }
310         break;
311
312     case VLC_FOURCC('R','V','2','4'):
313     case VLC_FOURCC('R','V','3','2'):
314         p_vout->chroma.p_sys->p_rgb32 = (uint32_t *)p_vout->chroma.p_sys->p_base;
315         for( i_index = 0; i_index < RED_MARGIN; i_index++ )
316         {
317             p_vout->chroma.p_sys->p_rgb32[RED_OFFSET - RED_MARGIN + i_index] = RGB2PIXEL( p_vout, pi_gamma[0], 0, 0 );
318             p_vout->chroma.p_sys->p_rgb32[RED_OFFSET + 256 + i_index] =        RGB2PIXEL( p_vout, pi_gamma[255], 0, 0 );
319         }
320         for( i_index = 0; i_index < GREEN_MARGIN; i_index++ )
321         {
322             p_vout->chroma.p_sys->p_rgb32[GREEN_OFFSET - GREEN_MARGIN + i_index] = RGB2PIXEL( p_vout, 0, pi_gamma[0], 0 );
323             p_vout->chroma.p_sys->p_rgb32[GREEN_OFFSET + 256 + i_index] =          RGB2PIXEL( p_vout, 0, pi_gamma[255], 0 );
324         }
325         for( i_index = 0; i_index < BLUE_MARGIN; i_index++ )
326         {
327             p_vout->chroma.p_sys->p_rgb32[BLUE_OFFSET - BLUE_MARGIN + i_index] = RGB2PIXEL( p_vout, 0, 0, pi_gamma[0] );
328             p_vout->chroma.p_sys->p_rgb32[BLUE_OFFSET + BLUE_MARGIN + i_index] = RGB2PIXEL( p_vout, 0, 0, pi_gamma[255] );
329         }
330         for( i_index = 0; i_index < 256; i_index++ )
331         {
332             p_vout->chroma.p_sys->p_rgb32[RED_OFFSET + i_index] =   RGB2PIXEL( p_vout, pi_gamma[ i_index ], 0, 0 );
333             p_vout->chroma.p_sys->p_rgb32[GREEN_OFFSET + i_index] = RGB2PIXEL( p_vout, 0, pi_gamma[ i_index ], 0 );
334             p_vout->chroma.p_sys->p_rgb32[BLUE_OFFSET + i_index] =  RGB2PIXEL( p_vout, 0, 0, pi_gamma[ i_index ] );
335         }
336         break;
337     }
338 }
339
340 static void Set8bppPalette( vout_thread_t *p_vout, uint8_t *p_rgb8 )
341 {
342     #define CLIP( x ) ( ((x < 0) ? 0 : (x > 255) ? 255 : x) << 8 )
343
344     int y,u,v;
345     int r,g,b;
346     int i = 0, j = 0;
347     uint16_t *p_cmap_r=p_vout->chroma.p_sys->p_rgb_r;
348     uint16_t *p_cmap_g=p_vout->chroma.p_sys->p_rgb_g;
349     uint16_t *p_cmap_b=p_vout->chroma.p_sys->p_rgb_b;
350
351     unsigned char p_lookup[PALETTE_TABLE_SIZE];
352
353     /* This loop calculates the intersection of an YUV box and the RGB cube. */
354     for ( y = 0; y <= 256; y += 16, i += 128 - 81 )
355     {
356         for ( u = 0; u <= 256; u += 32 )
357         {
358             for ( v = 0; v <= 256; v += 32 )
359             {
360                 r = y + ( (V_RED_COEF*(v-128)) >> SHIFT );
361                 g = y + ( (U_GREEN_COEF*(u-128)
362                          + V_GREEN_COEF*(v-128)) >> SHIFT );
363                 b = y + ( (U_BLUE_COEF*(u-128)) >> SHIFT );
364
365                 if( r >= 0x00 && g >= 0x00 && b >= 0x00
366                         && r <= 0xff && g <= 0xff && b <= 0xff )
367                 {
368                     /* This one should never happen unless someone
369                      * fscked up my code */
370                     if( j == 256 )
371                     {
372                         msg_Err( p_vout, "no colors left in palette" );
373                         break;
374                     }
375
376                     /* Clip the colors */
377                     p_cmap_r[ j ] = CLIP( r );
378                     p_cmap_g[ j ] = CLIP( g );
379                     p_cmap_b[ j ] = CLIP( b );
380
381 #if 0
382                     printf("+++Alloc RGB cmap %d (%d, %d, %d)\n", j,
383                            p_cmap_r[ j ] >>8, p_cmap_g[ j ] >>8, 
384                            p_cmap_b[ j ] >>8);
385 #endif
386
387                     /* Allocate color */
388                     p_lookup[ i ] = 1;
389                     p_rgb8[ i++ ] = j;
390                     j++;
391                 }
392                 else
393                 {
394                     p_lookup[ i ] = 0;
395                     p_rgb8[ i++ ] = 0;
396                 }
397             }
398         }
399     }
400
401     /* The colors have been allocated, we can set the palette */
402     p_vout->output.pf_setpalette( p_vout, p_cmap_r, p_cmap_g, p_cmap_b );
403
404 #if 0
405     /* There will eventually be a way to know which colors
406      * couldn't be allocated and try to find a replacement */
407     p_vout->i_white_pixel = 0xff;
408     p_vout->i_black_pixel = 0x00;
409     p_vout->i_gray_pixel = 0x44;
410     p_vout->i_blue_pixel = 0x3b;
411 #endif
412
413     /* This loop allocates colors that got outside the RGB cube */
414     for ( i = 0, y = 0; y <= 256; y += 16, i += 128 - 81 )
415     {
416         for ( u = 0; u <= 256; u += 32 )
417         {
418             for ( v = 0; v <= 256; v += 32, i++ )
419             {
420                 int u2, v2, dist, mindist = 100000000;
421
422                 if( p_lookup[ i ] || y == 0 )
423                 {
424                     continue;
425                 }
426
427                 /* Heavy. yeah. */
428                 for( u2 = 0; u2 <= 256; u2 += 32 )
429                 {
430                     for( v2 = 0; v2 <= 256; v2 += 32 )
431                     {
432                         j = ((y>>4)<<7) + (u2>>5)*9 + (v2>>5);
433                         dist = (u-u2)*(u-u2) + (v-v2)*(v-v2);
434
435                         /* Find the nearest color */
436                         if( p_lookup[ j ] && dist < mindist )
437                         {
438                             p_rgb8[ i ] = p_rgb8[ j ];
439                             mindist = dist;
440                         }
441
442                         j -= 128;
443
444                         /* Find the nearest color */
445                         if( p_lookup[ j ] && dist + 128 < mindist )
446                         {
447                             p_rgb8[ i ] = p_rgb8[ j ];
448                             mindist = dist + 128;
449                         }
450                     }
451                 }
452             }
453         }
454     }
455 }
456
457 #endif
458