1 /*****************************************************************************
2 * i420_rgb.c : YUV to bitmap RGB conversion module for vlc
3 *****************************************************************************
4 * Copyright (C) 2000, 2001 VideoLAN
5 * $Id: i420_rgb.c,v 1.1 2002/08/04 17:23:43 sam Exp $
7 * Authors: Samuel Hocevar <sam@zoy.org>
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.
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.
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 *****************************************************************************/
24 /*****************************************************************************
26 *****************************************************************************/
27 #include <math.h> /* exp(), pow() */
28 #include <errno.h> /* ENOMEM */
29 #include <string.h> /* strerror() */
30 #include <stdlib.h> /* malloc(), free() */
36 #if defined (MODULE_NAME_IS_i420_rgb)
37 # include "i420_rgb_c.h"
40 /*****************************************************************************
41 * Local and extern prototypes.
42 *****************************************************************************/
43 static int Activate ( vlc_object_t * );
44 static void Deactivate ( vlc_object_t * );
46 #if defined (MODULE_NAME_IS_i420_rgb)
47 static void SetGammaTable ( int *pi_table, double f_gamma );
48 static void SetYUV ( vout_thread_t * );
49 static void Set8bppPalette ( vout_thread_t *, u8 * );
52 /*****************************************************************************
54 *****************************************************************************/
56 #if defined (MODULE_NAME_IS_i420_rgb)
57 set_description( _("I420,IYUV,YV12 to "
58 "RGB,RV15,RV16,RV24,RV32 conversions") );
59 set_capability( "chroma", 80 );
60 #elif defined (MODULE_NAME_IS_i420_rgb_mmx)
61 set_description( _( "MMX I420,IYUV,YV12 to "
62 "RV15,RV16,RV24,RV32 conversions") );
63 set_capability( "chroma", 100 );
64 add_requirement( MMX );
66 set_callbacks( Activate, Deactivate );
69 /*****************************************************************************
70 * Activate: allocate a chroma function
71 *****************************************************************************
72 * This function allocates and initializes a chroma function
73 *****************************************************************************/
74 static int Activate( vlc_object_t *p_this )
76 vout_thread_t *p_vout = (vout_thread_t *)p_this;
77 #if defined (MODULE_NAME_IS_i420_rgb)
81 if( p_vout->render.i_width & 1 || p_vout->render.i_height & 1 )
86 switch( p_vout->render.i_chroma )
88 case VLC_FOURCC('Y','V','1','2'):
89 case VLC_FOURCC('I','4','2','0'):
90 case VLC_FOURCC('I','Y','U','V'):
91 switch( p_vout->output.i_chroma )
93 #if defined (MODULE_NAME_IS_i420_rgb)
94 case VLC_FOURCC('R','G','B','2'):
95 p_vout->chroma.pf_convert = E_(I420_RGB8);
98 case VLC_FOURCC('R','V','1','5'):
99 p_vout->chroma.pf_convert = E_(I420_RGB15);
102 case VLC_FOURCC('R','V','1','6'):
103 p_vout->chroma.pf_convert = E_(I420_RGB16);
106 case VLC_FOURCC('R','V','2','4'):
107 case VLC_FOURCC('R','V','3','2'):
108 p_vout->chroma.pf_convert = E_(I420_RGB32);
120 p_vout->chroma.p_sys = malloc( sizeof( chroma_sys_t ) );
121 if( p_vout->chroma.p_sys == NULL )
126 switch( p_vout->output.i_chroma )
128 #if defined (MODULE_NAME_IS_i420_rgb)
129 case VLC_FOURCC('R','G','B','2'):
130 p_vout->chroma.p_sys->p_buffer = malloc( VOUT_MAX_WIDTH );
134 case VLC_FOURCC('R','V','1','5'):
135 case VLC_FOURCC('R','V','1','6'):
136 p_vout->chroma.p_sys->p_buffer = malloc( VOUT_MAX_WIDTH * 2 );
139 case VLC_FOURCC('R','V','2','4'):
140 case VLC_FOURCC('R','V','3','2'):
141 p_vout->chroma.p_sys->p_buffer = malloc( VOUT_MAX_WIDTH * 4 );
145 p_vout->chroma.p_sys->p_buffer = NULL;
149 if( p_vout->chroma.p_sys->p_buffer == NULL )
151 free( p_vout->chroma.p_sys );
155 p_vout->chroma.p_sys->p_offset = malloc( p_vout->output.i_width
156 * ( ( p_vout->output.i_chroma
157 == VLC_FOURCC('R','G','B','2') ) ? 2 : 1 )
159 if( p_vout->chroma.p_sys->p_offset == NULL )
161 free( p_vout->chroma.p_sys->p_buffer );
162 free( p_vout->chroma.p_sys );
166 #if defined (MODULE_NAME_IS_i420_rgb)
167 switch( p_vout->output.i_chroma )
169 case VLC_FOURCC('R','G','B','2'):
170 i_tables_size = sizeof( u8 ) * PALETTE_TABLE_SIZE;
172 case VLC_FOURCC('R','V','1','5'):
173 case VLC_FOURCC('R','V','1','6'):
174 i_tables_size = sizeof( u16 ) * RGB_TABLE_SIZE;
176 default: /* RV24, RV32 */
177 i_tables_size = sizeof( u32 ) * RGB_TABLE_SIZE;
181 p_vout->chroma.p_sys->p_base = malloc( i_tables_size );
182 if( p_vout->chroma.p_sys->p_base == NULL )
184 free( p_vout->chroma.p_sys->p_offset );
185 free( p_vout->chroma.p_sys->p_buffer );
186 free( p_vout->chroma.p_sys );
196 /*****************************************************************************
197 * Deactivate: free the chroma function
198 *****************************************************************************
199 * This function frees the previously allocated chroma function
200 *****************************************************************************/
201 static void Deactivate( vlc_object_t *p_this )
203 vout_thread_t *p_vout = (vout_thread_t *)p_this;
205 #if defined (MODULE_NAME_IS_i420_rgb)
206 free( p_vout->chroma.p_sys->p_base );
208 free( p_vout->chroma.p_sys->p_offset );
209 free( p_vout->chroma.p_sys->p_buffer );
210 free( p_vout->chroma.p_sys );
213 #if defined (MODULE_NAME_IS_i420_rgb)
214 /*****************************************************************************
215 * SetGammaTable: return intensity table transformed by gamma curve.
216 *****************************************************************************
217 * pi_table is a table of 256 entries from 0 to 255.
218 *****************************************************************************/
219 static void SetGammaTable( int *pi_table, double f_gamma )
221 int i_y; /* base intensity */
223 /* Use exp(gamma) instead of gamma */
224 f_gamma = exp( f_gamma );
226 /* Build gamma table */
227 for( i_y = 0; i_y < 256; i_y++ )
229 pi_table[ i_y ] = pow( (double)i_y / 256, f_gamma ) * 256;
233 /*****************************************************************************
234 * SetYUV: compute tables and set function pointers
235 *****************************************************************************/
236 static void SetYUV( vout_thread_t *p_vout )
238 int pi_gamma[256]; /* gamma table */
239 int i_index; /* index in tables */
241 /* Build gamma table */
242 SetGammaTable( pi_gamma, p_vout->f_gamma );
245 * Set pointers and build YUV tables
248 /* Color: build red, green and blue tables */
249 switch( p_vout->output.i_chroma )
251 case VLC_FOURCC('R','G','B','2'):
252 p_vout->chroma.p_sys->p_rgb8 = (u8 *)p_vout->chroma.p_sys->p_base;
253 Set8bppPalette( p_vout, p_vout->chroma.p_sys->p_rgb8 );
256 case VLC_FOURCC('R','V','1','5'):
257 case VLC_FOURCC('R','V','1','6'):
258 p_vout->chroma.p_sys->p_rgb16 = (u16 *)p_vout->chroma.p_sys->p_base;
259 for( i_index = 0; i_index < RED_MARGIN; i_index++ )
261 p_vout->chroma.p_sys->p_rgb16[RED_OFFSET - RED_MARGIN + i_index] = RGB2PIXEL( p_vout, pi_gamma[0], 0, 0 );
262 p_vout->chroma.p_sys->p_rgb16[RED_OFFSET + 256 + i_index] = RGB2PIXEL( p_vout, pi_gamma[255], 0, 0 );
264 for( i_index = 0; i_index < GREEN_MARGIN; i_index++ )
266 p_vout->chroma.p_sys->p_rgb16[GREEN_OFFSET - GREEN_MARGIN + i_index] = RGB2PIXEL( p_vout, 0, pi_gamma[0], 0 );
267 p_vout->chroma.p_sys->p_rgb16[GREEN_OFFSET + 256 + i_index] = RGB2PIXEL( p_vout, 0, pi_gamma[255], 0 );
269 for( i_index = 0; i_index < BLUE_MARGIN; i_index++ )
271 p_vout->chroma.p_sys->p_rgb16[BLUE_OFFSET - BLUE_MARGIN + i_index] = RGB2PIXEL( p_vout, 0, 0, pi_gamma[0] );
272 p_vout->chroma.p_sys->p_rgb16[BLUE_OFFSET + BLUE_MARGIN + i_index] = RGB2PIXEL( p_vout, 0, 0, pi_gamma[255] );
274 for( i_index = 0; i_index < 256; i_index++ )
276 p_vout->chroma.p_sys->p_rgb16[RED_OFFSET + i_index] = RGB2PIXEL( p_vout, pi_gamma[ i_index ], 0, 0 );
277 p_vout->chroma.p_sys->p_rgb16[GREEN_OFFSET + i_index] = RGB2PIXEL( p_vout, 0, pi_gamma[ i_index ], 0 );
278 p_vout->chroma.p_sys->p_rgb16[BLUE_OFFSET + i_index] = RGB2PIXEL( p_vout, 0, 0, pi_gamma[ i_index ] );
282 case VLC_FOURCC('R','V','2','4'):
283 case VLC_FOURCC('R','V','3','2'):
284 p_vout->chroma.p_sys->p_rgb32 = (u32 *)p_vout->chroma.p_sys->p_base;
285 for( i_index = 0; i_index < RED_MARGIN; i_index++ )
287 p_vout->chroma.p_sys->p_rgb32[RED_OFFSET - RED_MARGIN + i_index] = RGB2PIXEL( p_vout, pi_gamma[0], 0, 0 );
288 p_vout->chroma.p_sys->p_rgb32[RED_OFFSET + 256 + i_index] = RGB2PIXEL( p_vout, pi_gamma[255], 0, 0 );
290 for( i_index = 0; i_index < GREEN_MARGIN; i_index++ )
292 p_vout->chroma.p_sys->p_rgb32[GREEN_OFFSET - GREEN_MARGIN + i_index] = RGB2PIXEL( p_vout, 0, pi_gamma[0], 0 );
293 p_vout->chroma.p_sys->p_rgb32[GREEN_OFFSET + 256 + i_index] = RGB2PIXEL( p_vout, 0, pi_gamma[255], 0 );
295 for( i_index = 0; i_index < BLUE_MARGIN; i_index++ )
297 p_vout->chroma.p_sys->p_rgb32[BLUE_OFFSET - BLUE_MARGIN + i_index] = RGB2PIXEL( p_vout, 0, 0, pi_gamma[0] );
298 p_vout->chroma.p_sys->p_rgb32[BLUE_OFFSET + BLUE_MARGIN + i_index] = RGB2PIXEL( p_vout, 0, 0, pi_gamma[255] );
300 for( i_index = 0; i_index < 256; i_index++ )
302 p_vout->chroma.p_sys->p_rgb32[RED_OFFSET + i_index] = RGB2PIXEL( p_vout, pi_gamma[ i_index ], 0, 0 );
303 p_vout->chroma.p_sys->p_rgb32[GREEN_OFFSET + i_index] = RGB2PIXEL( p_vout, 0, pi_gamma[ i_index ], 0 );
304 p_vout->chroma.p_sys->p_rgb32[BLUE_OFFSET + i_index] = RGB2PIXEL( p_vout, 0, 0, pi_gamma[ i_index ] );
310 static void Set8bppPalette( vout_thread_t *p_vout, u8 *p_rgb8 )
312 #define CLIP( x ) ( ((x < 0) ? 0 : (x > 255) ? 255 : x) << 8 )
317 u16 red[ 256 ], green[ 256 ], blue[ 256 ];
318 unsigned char p_lookup[PALETTE_TABLE_SIZE];
320 /* This loop calculates the intersection of an YUV box and the RGB cube. */
321 for ( y = 0; y <= 256; y += 16, i += 128 - 81 )
323 for ( u = 0; u <= 256; u += 32 )
325 for ( v = 0; v <= 256; v += 32 )
327 r = y + ( (V_RED_COEF*(v-128)) >> SHIFT );
328 g = y + ( (U_GREEN_COEF*(u-128)
329 + V_GREEN_COEF*(v-128)) >> SHIFT );
330 b = y + ( (U_BLUE_COEF*(u-128)) >> SHIFT );
332 if( r >= 0x00 && g >= 0x00 && b >= 0x00
333 && r <= 0xff && g <= 0xff && b <= 0xff )
335 /* This one should never happen unless someone
336 * fscked up my code */
339 msg_Err( p_vout, "no colors left in palette" );
343 /* Clip the colors */
344 red[ j ] = CLIP( r );
345 green[ j ] = CLIP( g );
346 blue[ j ] = CLIP( b );
362 /* The colors have been allocated, we can set the palette */
363 p_vout->output.pf_setpalette( p_vout, red, green, blue );
366 /* There will eventually be a way to know which colors
367 * couldn't be allocated and try to find a replacement */
368 p_vout->i_white_pixel = 0xff;
369 p_vout->i_black_pixel = 0x00;
370 p_vout->i_gray_pixel = 0x44;
371 p_vout->i_blue_pixel = 0x3b;
374 /* This loop allocates colors that got outside the RGB cube */
375 for ( i = 0, y = 0; y <= 256; y += 16, i += 128 - 81 )
377 for ( u = 0; u <= 256; u += 32 )
379 for ( v = 0; v <= 256; v += 32, i++ )
381 int u2, v2, dist, mindist = 100000000;
383 if( p_lookup[ i ] || y == 0 )
389 for( u2 = 0; u2 <= 256; u2 += 32 )
391 for( v2 = 0; v2 <= 256; v2 += 32 )
393 j = ((y>>4)<<7) + (u2>>5)*9 + (v2>>5);
394 dist = (u-u2)*(u-u2) + (v-v2)*(v-v2);
396 /* Find the nearest color */
397 if( p_lookup[ j ] && dist < mindist )
399 p_rgb8[ i ] = p_rgb8[ j ];
405 /* Find the nearest color */
406 if( p_lookup[ j ] && dist + 128 < mindist )
408 p_rgb8[ i ] = p_rgb8[ j ];
409 mindist = dist + 128;