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 1.4 2003/08/29 18:58:05 fenrir 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 <string.h> /* strerror() */
29 #include <stdlib.h> /* malloc(), free() */
35 #if defined (MODULE_NAME_IS_i420_rgb)
36 # include "i420_rgb_c.h"
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))
50 /*****************************************************************************
51 * Local and extern prototypes.
52 *****************************************************************************/
53 static int Activate ( vlc_object_t * );
54 static void Deactivate ( vlc_object_t * );
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 * );
62 /*****************************************************************************
64 *****************************************************************************/
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 );
76 set_callbacks( Activate, Deactivate );
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 )
86 vout_thread_t *p_vout = (vout_thread_t *)p_this;
87 #if defined (MODULE_NAME_IS_i420_rgb)
91 if( p_vout->render.i_width & 1 || p_vout->render.i_height & 1 )
96 switch( p_vout->render.i_chroma )
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 )
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);
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 ) )
122 p_vout->chroma.pf_convert = E_(I420_RGB16);
125 case VLC_FOURCC('R','V','2','4'):
126 case VLC_FOURCC('R','V','3','2'):
127 #if defined (MODULE_NAME_IS_i420_rgb_mmx)
128 /* If we don't have support for the bitmasks, bail out */
129 if( p_vout->output.i_rmask != 0x00ff0000
130 || p_vout->output.i_gmask != 0x0000ff00
131 || p_vout->output.i_bmask != 0x000000ff )
136 p_vout->chroma.pf_convert = E_(I420_RGB32);
148 p_vout->chroma.p_sys = malloc( sizeof( chroma_sys_t ) );
149 if( p_vout->chroma.p_sys == NULL )
154 switch( p_vout->output.i_chroma )
156 #if defined (MODULE_NAME_IS_i420_rgb)
157 case VLC_FOURCC('R','G','B','2'):
158 p_vout->chroma.p_sys->p_buffer = malloc( VOUT_MAX_WIDTH );
162 case VLC_FOURCC('R','V','1','5'):
163 case VLC_FOURCC('R','V','1','6'):
164 p_vout->chroma.p_sys->p_buffer = malloc( VOUT_MAX_WIDTH * 2 );
167 case VLC_FOURCC('R','V','2','4'):
168 case VLC_FOURCC('R','V','3','2'):
169 p_vout->chroma.p_sys->p_buffer = malloc( VOUT_MAX_WIDTH * 4 );
173 p_vout->chroma.p_sys->p_buffer = NULL;
177 if( p_vout->chroma.p_sys->p_buffer == NULL )
179 free( p_vout->chroma.p_sys );
183 p_vout->chroma.p_sys->p_offset = malloc( p_vout->output.i_width
184 * ( ( p_vout->output.i_chroma
185 == VLC_FOURCC('R','G','B','2') ) ? 2 : 1 )
187 if( p_vout->chroma.p_sys->p_offset == NULL )
189 free( p_vout->chroma.p_sys->p_buffer );
190 free( p_vout->chroma.p_sys );
194 #if defined (MODULE_NAME_IS_i420_rgb)
195 switch( p_vout->output.i_chroma )
197 case VLC_FOURCC('R','G','B','2'):
198 i_tables_size = sizeof( uint8_t ) * PALETTE_TABLE_SIZE;
200 case VLC_FOURCC('R','V','1','5'):
201 case VLC_FOURCC('R','V','1','6'):
202 i_tables_size = sizeof( uint16_t ) * RGB_TABLE_SIZE;
204 default: /* RV24, RV32 */
205 i_tables_size = sizeof( uint32_t ) * RGB_TABLE_SIZE;
209 p_vout->chroma.p_sys->p_base = malloc( i_tables_size );
210 if( p_vout->chroma.p_sys->p_base == NULL )
212 free( p_vout->chroma.p_sys->p_offset );
213 free( p_vout->chroma.p_sys->p_buffer );
214 free( p_vout->chroma.p_sys );
224 /*****************************************************************************
225 * Deactivate: free the chroma function
226 *****************************************************************************
227 * This function frees the previously allocated chroma function
228 *****************************************************************************/
229 static void Deactivate( vlc_object_t *p_this )
231 vout_thread_t *p_vout = (vout_thread_t *)p_this;
233 #if defined (MODULE_NAME_IS_i420_rgb)
234 free( p_vout->chroma.p_sys->p_base );
236 free( p_vout->chroma.p_sys->p_offset );
237 free( p_vout->chroma.p_sys->p_buffer );
238 free( p_vout->chroma.p_sys );
241 #if defined (MODULE_NAME_IS_i420_rgb)
242 /*****************************************************************************
243 * SetGammaTable: return intensity table transformed by gamma curve.
244 *****************************************************************************
245 * pi_table is a table of 256 entries from 0 to 255.
246 *****************************************************************************/
247 static void SetGammaTable( int *pi_table, double f_gamma )
249 int i_y; /* base intensity */
251 /* Use exp(gamma) instead of gamma */
252 f_gamma = exp( f_gamma );
254 /* Build gamma table */
255 for( i_y = 0; i_y < 256; i_y++ )
257 pi_table[ i_y ] = (int)( pow( (double)i_y / 256, f_gamma ) * 256 );
261 /*****************************************************************************
262 * SetYUV: compute tables and set function pointers
263 *****************************************************************************/
264 static void SetYUV( vout_thread_t *p_vout )
266 int pi_gamma[256]; /* gamma table */
267 int i_index; /* index in tables */
269 /* Build gamma table */
270 SetGammaTable( pi_gamma, p_vout->f_gamma );
273 * Set pointers and build YUV tables
276 /* Color: build red, green and blue tables */
277 switch( p_vout->output.i_chroma )
279 case VLC_FOURCC('R','G','B','2'):
280 p_vout->chroma.p_sys->p_rgb8 = (uint8_t *)p_vout->chroma.p_sys->p_base;
281 Set8bppPalette( p_vout, p_vout->chroma.p_sys->p_rgb8 );
284 case VLC_FOURCC('R','V','1','5'):
285 case VLC_FOURCC('R','V','1','6'):
286 p_vout->chroma.p_sys->p_rgb16 = (uint16_t *)p_vout->chroma.p_sys->p_base;
287 for( i_index = 0; i_index < RED_MARGIN; i_index++ )
289 p_vout->chroma.p_sys->p_rgb16[RED_OFFSET - RED_MARGIN + i_index] = RGB2PIXEL( p_vout, pi_gamma[0], 0, 0 );
290 p_vout->chroma.p_sys->p_rgb16[RED_OFFSET + 256 + i_index] = RGB2PIXEL( p_vout, pi_gamma[255], 0, 0 );
292 for( i_index = 0; i_index < GREEN_MARGIN; i_index++ )
294 p_vout->chroma.p_sys->p_rgb16[GREEN_OFFSET - GREEN_MARGIN + i_index] = RGB2PIXEL( p_vout, 0, pi_gamma[0], 0 );
295 p_vout->chroma.p_sys->p_rgb16[GREEN_OFFSET + 256 + i_index] = RGB2PIXEL( p_vout, 0, pi_gamma[255], 0 );
297 for( i_index = 0; i_index < BLUE_MARGIN; i_index++ )
299 p_vout->chroma.p_sys->p_rgb16[BLUE_OFFSET - BLUE_MARGIN + i_index] = RGB2PIXEL( p_vout, 0, 0, pi_gamma[0] );
300 p_vout->chroma.p_sys->p_rgb16[BLUE_OFFSET + BLUE_MARGIN + i_index] = RGB2PIXEL( p_vout, 0, 0, pi_gamma[255] );
302 for( i_index = 0; i_index < 256; i_index++ )
304 p_vout->chroma.p_sys->p_rgb16[RED_OFFSET + i_index] = RGB2PIXEL( p_vout, pi_gamma[ i_index ], 0, 0 );
305 p_vout->chroma.p_sys->p_rgb16[GREEN_OFFSET + i_index] = RGB2PIXEL( p_vout, 0, pi_gamma[ i_index ], 0 );
306 p_vout->chroma.p_sys->p_rgb16[BLUE_OFFSET + i_index] = RGB2PIXEL( p_vout, 0, 0, pi_gamma[ i_index ] );
310 case VLC_FOURCC('R','V','2','4'):
311 case VLC_FOURCC('R','V','3','2'):
312 p_vout->chroma.p_sys->p_rgb32 = (uint32_t *)p_vout->chroma.p_sys->p_base;
313 for( i_index = 0; i_index < RED_MARGIN; i_index++ )
315 p_vout->chroma.p_sys->p_rgb32[RED_OFFSET - RED_MARGIN + i_index] = RGB2PIXEL( p_vout, pi_gamma[0], 0, 0 );
316 p_vout->chroma.p_sys->p_rgb32[RED_OFFSET + 256 + i_index] = RGB2PIXEL( p_vout, pi_gamma[255], 0, 0 );
318 for( i_index = 0; i_index < GREEN_MARGIN; i_index++ )
320 p_vout->chroma.p_sys->p_rgb32[GREEN_OFFSET - GREEN_MARGIN + i_index] = RGB2PIXEL( p_vout, 0, pi_gamma[0], 0 );
321 p_vout->chroma.p_sys->p_rgb32[GREEN_OFFSET + 256 + i_index] = RGB2PIXEL( p_vout, 0, pi_gamma[255], 0 );
323 for( i_index = 0; i_index < BLUE_MARGIN; i_index++ )
325 p_vout->chroma.p_sys->p_rgb32[BLUE_OFFSET - BLUE_MARGIN + i_index] = RGB2PIXEL( p_vout, 0, 0, pi_gamma[0] );
326 p_vout->chroma.p_sys->p_rgb32[BLUE_OFFSET + BLUE_MARGIN + i_index] = RGB2PIXEL( p_vout, 0, 0, pi_gamma[255] );
328 for( i_index = 0; i_index < 256; i_index++ )
330 p_vout->chroma.p_sys->p_rgb32[RED_OFFSET + i_index] = RGB2PIXEL( p_vout, pi_gamma[ i_index ], 0, 0 );
331 p_vout->chroma.p_sys->p_rgb32[GREEN_OFFSET + i_index] = RGB2PIXEL( p_vout, 0, pi_gamma[ i_index ], 0 );
332 p_vout->chroma.p_sys->p_rgb32[BLUE_OFFSET + i_index] = RGB2PIXEL( p_vout, 0, 0, pi_gamma[ i_index ] );
338 static void Set8bppPalette( vout_thread_t *p_vout, uint8_t *p_rgb8 )
340 #define CLIP( x ) ( ((x < 0) ? 0 : (x > 255) ? 255 : x) << 8 )
345 uint16_t red[ 256 ], green[ 256 ], blue[ 256 ];
346 unsigned char p_lookup[PALETTE_TABLE_SIZE];
348 /* This loop calculates the intersection of an YUV box and the RGB cube. */
349 for ( y = 0; y <= 256; y += 16, i += 128 - 81 )
351 for ( u = 0; u <= 256; u += 32 )
353 for ( v = 0; v <= 256; v += 32 )
355 r = y + ( (V_RED_COEF*(v-128)) >> SHIFT );
356 g = y + ( (U_GREEN_COEF*(u-128)
357 + V_GREEN_COEF*(v-128)) >> SHIFT );
358 b = y + ( (U_BLUE_COEF*(u-128)) >> SHIFT );
360 if( r >= 0x00 && g >= 0x00 && b >= 0x00
361 && r <= 0xff && g <= 0xff && b <= 0xff )
363 /* This one should never happen unless someone
364 * fscked up my code */
367 msg_Err( p_vout, "no colors left in palette" );
371 /* Clip the colors */
372 red[ j ] = CLIP( r );
373 green[ j ] = CLIP( g );
374 blue[ j ] = CLIP( b );
390 /* The colors have been allocated, we can set the palette */
391 p_vout->output.pf_setpalette( p_vout, red, green, blue );
394 /* There will eventually be a way to know which colors
395 * couldn't be allocated and try to find a replacement */
396 p_vout->i_white_pixel = 0xff;
397 p_vout->i_black_pixel = 0x00;
398 p_vout->i_gray_pixel = 0x44;
399 p_vout->i_blue_pixel = 0x3b;
402 /* This loop allocates colors that got outside the RGB cube */
403 for ( i = 0, y = 0; y <= 256; y += 16, i += 128 - 81 )
405 for ( u = 0; u <= 256; u += 32 )
407 for ( v = 0; v <= 256; v += 32, i++ )
409 int u2, v2, dist, mindist = 100000000;
411 if( p_lookup[ i ] || y == 0 )
417 for( u2 = 0; u2 <= 256; u2 += 32 )
419 for( v2 = 0; v2 <= 256; v2 += 32 )
421 j = ((y>>4)<<7) + (u2>>5)*9 + (v2>>5);
422 dist = (u-u2)*(u-u2) + (v-v2)*(v-v2);
424 /* Find the nearest color */
425 if( p_lookup[ j ] && dist < mindist )
427 p_rgb8[ i ] = p_rgb8[ j ];
433 /* Find the nearest color */
434 if( p_lookup[ j ] && dist + 128 < mindist )
436 p_rgb8[ i ] = p_rgb8[ j ];
437 mindist = dist + 128;