1 /*****************************************************************************
2 * grey_yuv.c : grayscale to others conversion module for vlc
3 *****************************************************************************
4 * Copyright (C) 2007 the VideoLAN team
7 * Authors: Sam 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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
22 *****************************************************************************/
24 /*****************************************************************************
26 *****************************************************************************/
31 #define SRC_FOURCC "GREY"
32 #define DEST_FOURCC "I420,YUY2"
34 /*****************************************************************************
35 * Local and extern prototypes.
36 *****************************************************************************/
37 static int Activate ( vlc_object_t * );
39 static void GREY_I420 ( vout_thread_t *, picture_t *, picture_t * );
40 static void GREY_YUY2 ( vout_thread_t *, picture_t *, picture_t * );
42 /*****************************************************************************
44 *****************************************************************************/
46 set_description( _("Conversions from " SRC_FOURCC " to " DEST_FOURCC) );
47 set_capability( "chroma", 80 );
48 set_callbacks( Activate, NULL );
51 /*****************************************************************************
52 * Activate: allocate a chroma function
53 *****************************************************************************
54 * This function allocates and initializes a chroma function
55 *****************************************************************************/
56 static int Activate( vlc_object_t *p_this )
58 vout_thread_t *p_vout = (vout_thread_t *)p_this;
60 if( p_vout->render.i_width & 1 || p_vout->render.i_height & 1 )
65 switch( p_vout->render.i_chroma )
67 case VLC_FOURCC('G','R','E','Y'):
68 switch( p_vout->output.i_chroma )
70 case VLC_FOURCC('I','4','2','0'):
71 p_vout->chroma.pf_convert = GREY_I420;
73 case VLC_FOURCC('Y','U','Y','2'):
74 p_vout->chroma.pf_convert = GREY_YUY2;
88 /* Following functions are local */
90 /*****************************************************************************
91 * GREY_I420: 8-bit grayscale to planar YUV 4:2:0
92 *****************************************************************************/
93 static void GREY_I420( vout_thread_t *p_vout, picture_t *p_source,
96 uint8_t *p_line = p_source->p->p_pixels;
97 uint8_t *p_y = p_dest->Y_PIXELS;
98 uint8_t *p_u = p_dest->U_PIXELS;
99 uint8_t *p_v = p_dest->V_PIXELS;
103 const int i_source_margin = p_source->p->i_pitch
104 - p_source->p->i_visible_pitch;
105 const int i_dest_margin = p_dest->p[0].i_pitch
106 - p_dest->p[0].i_visible_pitch;
107 const int i_dest_margin_c = p_dest->p[1].i_pitch
108 - p_dest->p[1].i_visible_pitch;
110 for( i_y = p_vout->render.i_height / 2; i_y-- ; )
112 memset(p_u, 0x80, p_dest->p[1].i_visible_pitch);
113 p_u += i_dest_margin_c;
115 memset(p_v, 0x80, p_dest->p[1].i_visible_pitch);
116 p_v += i_dest_margin_c;
119 for( i_y = p_vout->render.i_height; i_y-- ; )
121 for( i_x = p_vout->render.i_width / 8; i_x-- ; )
123 *p_y++ = *p_line++; *p_y++ = *p_line++;
124 *p_y++ = *p_line++; *p_y++ = *p_line++;
125 *p_y++ = *p_line++; *p_y++ = *p_line++;
126 *p_y++ = *p_line++; *p_y++ = *p_line++;
129 for( i_x = p_vout->render.i_width % 8; i_x-- ; )
134 p_line += i_source_margin;
135 p_y += i_dest_margin;
139 /*****************************************************************************
140 * GREY_YUY2: 8-bit grayscale to packed YUY2
141 *****************************************************************************/
142 static void GREY_YUY2( vout_thread_t *p_vout, picture_t *p_source,
145 uint8_t *p_in = p_source->p->p_pixels;
146 uint8_t *p_out = p_dest->p->p_pixels;
150 const int i_source_margin = p_source->p->i_pitch
151 - p_source->p->i_visible_pitch;
152 const int i_dest_margin = p_dest->p->i_pitch
153 - p_dest->p->i_visible_pitch;
155 for( i_y = p_vout->render.i_height; i_y-- ; )
157 for( i_x = p_vout->render.i_width / 8; i_x-- ; )
159 *p_out++ = *p_in++; *p_out++ = 0x80;
160 *p_out++ = *p_in++; *p_out++ = 0x80;
161 *p_out++ = *p_in++; *p_out++ = 0x80;
162 *p_out++ = *p_in++; *p_out++ = 0x80;
163 *p_out++ = *p_in++; *p_out++ = 0x80;
164 *p_out++ = *p_in++; *p_out++ = 0x80;
165 *p_out++ = *p_in++; *p_out++ = 0x80;
166 *p_out++ = *p_in++; *p_out++ = 0x80;
169 for( i_x = (p_vout->render.i_width % 8) / 2; i_x-- ; )
171 *p_out++ = *p_in++; *p_out++ = 0x80;
172 *p_out++ = *p_in++; *p_out++ = 0x80;
175 p_in += i_source_margin;
176 p_out += i_dest_margin;