1 /*****************************************************************************
2 * picture.c : picture management functions
3 *****************************************************************************
4 * Copyright (C) 2000-2010 VLC authors and VideoLAN
5 * Copyright (C) 2009-2010 Laurent Aimar
8 * Authors: Vincent Seguin <seguin@via.ecp.fr>
9 * Samuel Hocevar <sam@zoy.org>
10 * Laurent Aimar <fenrir _AT_ videolan _DOT_ org>
12 * This program is free software; you can redistribute it and/or modify it
13 * under the terms of the GNU Lesser General Public License as published by
14 * the Free Software Foundation; either version 2.1 of the License, or
15 * (at your option) any later version.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU Lesser General Public License for more details.
22 * You should have received a copy of the GNU Lesser General Public License
23 * along with this program; if not, write to the Free Software Foundation,
24 * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
25 *****************************************************************************/
27 /*****************************************************************************
29 *****************************************************************************/
36 #include <vlc_common.h>
37 #include <vlc_picture.h>
38 #include <vlc_image.h>
39 #include <vlc_block.h>
40 #include <vlc_atomic.h>
43 * Allocate a new picture in the heap.
45 * This function allocates a fake direct buffer in memory, which can be
46 * used exactly like a video buffer. The video output thread then manages
47 * how it gets displayed.
49 static int AllocatePicture( picture_t *p_pic,
50 vlc_fourcc_t i_chroma,
51 int i_width, int i_height,
52 int i_sar_num, int i_sar_den )
54 /* Make sure the real dimensions are a multiple of 16 */
55 if( picture_Setup( p_pic, i_chroma, i_width, i_height,
56 i_sar_num, i_sar_den ) != VLC_SUCCESS )
59 /* Calculate how big the new image should be */
61 for( int i = 0; i < p_pic->i_planes; i++ )
63 const plane_t *p = &p_pic->p[i];
65 if( p->i_pitch <= 0 || p->i_lines <= 0 ||
66 (size_t)p->i_pitch > (SIZE_MAX - i_bytes)/p->i_lines )
71 i_bytes += p->i_pitch * p->i_lines;
74 uint8_t *p_data = vlc_memalign( 16, i_bytes );
80 p_pic->gc.p_sys = (void *)p_data;
82 /* Fill the p_pixels field for each plane */
83 p_pic->p[0].p_pixels = p_data;
84 for( int i = 1; i < p_pic->i_planes; i++ )
86 p_pic->p[i].p_pixels = &p_pic->p[i-1].p_pixels[ p_pic->p[i-1].i_lines *
87 p_pic->p[i-1].i_pitch ];
93 /*****************************************************************************
95 *****************************************************************************/
96 static void PictureDestroy( picture_t *p_picture )
99 vlc_atomic_get( &p_picture->gc.refcount ) == 0 );
101 vlc_free( p_picture->gc.p_sys );
102 free( p_picture->p_sys );
106 /*****************************************************************************
108 *****************************************************************************/
109 void picture_Reset( picture_t *p_picture )
112 p_picture->date = VLC_TS_INVALID;
113 p_picture->b_force = false;
114 p_picture->b_progressive = false;
115 p_picture->i_nb_fields = 2;
116 p_picture->b_top_field_first = false;
119 /*****************************************************************************
121 *****************************************************************************/
122 static int LCM( int a, int b )
124 return a * b / GCD( a, b );
127 int picture_Setup( picture_t *p_picture, vlc_fourcc_t i_chroma,
128 int i_width, int i_height, int i_sar_num, int i_sar_den )
130 /* Store default values */
131 p_picture->i_planes = 0;
132 for( unsigned i = 0; i < VOUT_MAX_PLANES; i++ )
134 plane_t *p = &p_picture->p[i];
136 p->i_pixel_pitch = 0;
139 vlc_atomic_set( &p_picture->gc.refcount, 0 );
140 p_picture->gc.pf_destroy = NULL;
141 p_picture->gc.p_sys = NULL;
143 p_picture->i_nb_fields = 2;
145 video_format_Setup( &p_picture->format, i_chroma, i_width, i_height,
146 i_sar_num, i_sar_den );
148 const vlc_chroma_description_t *p_dsc =
149 vlc_fourcc_GetChromaDescription( p_picture->format.i_chroma );
153 /* We want V (width/height) to respect:
154 (V * p_dsc->p[i].w.i_num) % p_dsc->p[i].w.i_den == 0
155 (V * p_dsc->p[i].w.i_num/p_dsc->p[i].w.i_den * p_dsc->i_pixel_size) % 16 == 0
156 Which is respected if you have
157 V % lcm( p_dsc->p[0..planes].w.i_den * 16) == 0
161 unsigned int i_ratio_h = 1;
162 for( unsigned i = 0; i < p_dsc->plane_count; i++ )
164 i_modulo_w = LCM( i_modulo_w, 16 * p_dsc->p[i].w.den );
165 i_modulo_h = LCM( i_modulo_h, 16 * p_dsc->p[i].h.den );
166 if( i_ratio_h < p_dsc->p[i].h.den )
167 i_ratio_h = p_dsc->p[i].h.den;
169 i_modulo_h = LCM( i_modulo_h, 32 );
171 const int i_width_aligned = ( i_width + i_modulo_w - 1 ) / i_modulo_w * i_modulo_w;
172 const int i_height_aligned = ( i_height + i_modulo_h - 1 ) / i_modulo_h * i_modulo_h;
173 const int i_height_extra = 2 * i_ratio_h; /* This one is a hack for some ASM functions */
174 for( unsigned i = 0; i < p_dsc->plane_count; i++ )
176 plane_t *p = &p_picture->p[i];
178 p->i_lines = (i_height_aligned + i_height_extra ) * p_dsc->p[i].h.num / p_dsc->p[i].h.den;
179 p->i_visible_lines = i_height * p_dsc->p[i].h.num / p_dsc->p[i].h.den;
180 p->i_pitch = i_width_aligned * p_dsc->p[i].w.num / p_dsc->p[i].w.den * p_dsc->pixel_size;
181 p->i_visible_pitch = i_width * p_dsc->p[i].w.num / p_dsc->p[i].w.den * p_dsc->pixel_size;
182 p->i_pixel_pitch = p_dsc->pixel_size;
184 assert( (p->i_pitch % 16) == 0 );
186 p_picture->i_planes = p_dsc->plane_count;
191 /*****************************************************************************
193 *****************************************************************************/
194 picture_t *picture_NewFromResource( const video_format_t *p_fmt, const picture_resource_t *p_resource )
196 video_format_t fmt = *p_fmt;
198 /* It is needed to be sure all information are filled */
199 video_format_Setup( &fmt, p_fmt->i_chroma,
200 p_fmt->i_width, p_fmt->i_height,
201 p_fmt->i_sar_num, p_fmt->i_sar_den );
202 if( p_fmt->i_x_offset < p_fmt->i_width &&
203 p_fmt->i_y_offset < p_fmt->i_height &&
204 p_fmt->i_visible_width > 0 && p_fmt->i_x_offset + p_fmt->i_visible_width <= p_fmt->i_width &&
205 p_fmt->i_visible_height > 0 && p_fmt->i_y_offset + p_fmt->i_visible_height <= p_fmt->i_height )
206 video_format_CopyCrop( &fmt, p_fmt );
209 picture_t *p_picture = calloc( 1, sizeof(*p_picture) );
215 if( picture_Setup( p_picture, fmt.i_chroma, fmt.i_width, fmt.i_height,
216 fmt.i_sar_num, fmt.i_sar_den ) )
221 p_picture->p_sys = p_resource->p_sys;
222 assert( p_picture->gc.p_sys == NULL );
224 for( int i = 0; i < p_picture->i_planes; i++ )
226 p_picture->p[i].p_pixels = p_resource->p[i].p_pixels;
227 p_picture->p[i].i_lines = p_resource->p[i].i_lines;
228 p_picture->p[i].i_pitch = p_resource->p[i].i_pitch;
233 if( AllocatePicture( p_picture,
234 fmt.i_chroma, fmt.i_width, fmt.i_height,
235 fmt.i_sar_num, fmt.i_sar_den ) )
240 assert( p_picture->gc.p_sys != NULL );
243 p_picture->format = fmt;
245 vlc_atomic_set( &p_picture->gc.refcount, 1 );
246 p_picture->gc.pf_destroy = PictureDestroy;
250 picture_t *picture_NewFromFormat( const video_format_t *p_fmt )
252 return picture_NewFromResource( p_fmt, NULL );
254 picture_t *picture_New( vlc_fourcc_t i_chroma, int i_width, int i_height, int i_sar_num, int i_sar_den )
258 memset( &fmt, 0, sizeof(fmt) );
259 video_format_Setup( &fmt, i_chroma, i_width, i_height,
260 i_sar_num, i_sar_den );
262 return picture_NewFromFormat( &fmt );
265 /*****************************************************************************
267 *****************************************************************************/
269 picture_t *picture_Hold( picture_t *p_picture )
271 vlc_atomic_inc( &p_picture->gc.refcount );
275 void picture_Release( picture_t *p_picture )
277 if( vlc_atomic_dec( &p_picture->gc.refcount ) == 0 &&
278 p_picture->gc.pf_destroy )
279 p_picture->gc.pf_destroy( p_picture );
282 bool picture_IsReferenced( picture_t *p_picture )
284 return vlc_atomic_get( &p_picture->gc.refcount ) > 1;
287 /*****************************************************************************
289 *****************************************************************************/
290 void plane_CopyPixels( plane_t *p_dst, const plane_t *p_src )
292 const unsigned i_width = __MIN( p_dst->i_visible_pitch,
293 p_src->i_visible_pitch );
294 const unsigned i_height = __MIN( p_dst->i_visible_lines,
295 p_src->i_visible_lines );
297 /* The 2x visible pitch check does two things:
298 1) Makes field plane_t's work correctly (see the deinterlacer module)
299 2) Moves less data if the pitch and visible pitch differ much.
301 if( p_src->i_pitch == p_dst->i_pitch &&
302 p_src->i_pitch < 2*p_src->i_visible_pitch )
304 /* There are margins, but with the same width : perfect ! */
305 memcpy( p_dst->p_pixels, p_src->p_pixels,
306 p_src->i_pitch * i_height );
310 /* We need to proceed line by line */
311 uint8_t *p_in = p_src->p_pixels;
312 uint8_t *p_out = p_dst->p_pixels;
318 for( i_line = i_height; i_line--; )
320 memcpy( p_out, p_in, i_width );
321 p_in += p_src->i_pitch;
322 p_out += p_dst->i_pitch;
327 void picture_CopyProperties( picture_t *p_dst, const picture_t *p_src )
329 p_dst->date = p_src->date;
330 p_dst->b_force = p_src->b_force;
332 p_dst->b_progressive = p_src->b_progressive;
333 p_dst->i_nb_fields = p_src->i_nb_fields;
334 p_dst->b_top_field_first = p_src->b_top_field_first;
337 void picture_CopyPixels( picture_t *p_dst, const picture_t *p_src )
341 for( i = 0; i < p_src->i_planes ; i++ )
342 plane_CopyPixels( p_dst->p+i, p_src->p+i );
345 void picture_Copy( picture_t *p_dst, const picture_t *p_src )
347 picture_CopyPixels( p_dst, p_src );
348 picture_CopyProperties( p_dst, p_src );
352 /*****************************************************************************
354 *****************************************************************************/
355 int picture_Export( vlc_object_t *p_obj,
357 video_format_t *p_fmt,
358 picture_t *p_picture,
359 vlc_fourcc_t i_format,
360 int i_override_width, int i_override_height )
363 video_format_t fmt_in = p_picture->format;
364 if( fmt_in.i_sar_num <= 0 || fmt_in.i_sar_den <= 0 )
367 fmt_in.i_sar_den = 1;
371 video_format_t fmt_out;
372 memset( &fmt_out, 0, sizeof(fmt_out) );
374 fmt_out.i_sar_den = 1;
375 fmt_out.i_chroma = i_format;
377 /* compute original width/height */
378 unsigned int i_original_width;
379 unsigned int i_original_height;
380 if( fmt_in.i_sar_num >= fmt_in.i_sar_den )
382 i_original_width = (int64_t)fmt_in.i_width * fmt_in.i_sar_num / fmt_in.i_sar_den;
383 i_original_height = fmt_in.i_height;
387 i_original_width = fmt_in.i_width;
388 i_original_height = (int64_t)fmt_in.i_height * fmt_in.i_sar_den / fmt_in.i_sar_num;
392 fmt_out.i_width = ( i_override_width < 0 ) ?
393 i_original_width : (unsigned)i_override_width;
394 fmt_out.i_height = ( i_override_height < 0 ) ?
395 i_original_height : (unsigned)i_override_height;
397 /* scale if only one direction is provided */
398 if( fmt_out.i_height == 0 && fmt_out.i_width > 0 )
400 fmt_out.i_height = fmt_in.i_height * fmt_out.i_width
401 * fmt_in.i_sar_den / fmt_in.i_width / fmt_in.i_sar_num;
403 else if( fmt_out.i_width == 0 && fmt_out.i_height > 0 )
405 fmt_out.i_width = fmt_in.i_width * fmt_out.i_height
406 * fmt_in.i_sar_num / fmt_in.i_height / fmt_in.i_sar_den;
409 image_handler_t *p_image = image_HandlerCreate( p_obj );
411 block_t *p_block = image_Write( p_image, p_picture, &fmt_in, &fmt_out );
413 image_HandlerDelete( p_image );
419 p_block->i_dts = p_picture->date;
428 void picture_BlendSubpicture(picture_t *dst,
429 filter_t *blend, subpicture_t *src)
431 assert(src && !src->b_fade && src->b_absolute);
433 for (subpicture_region_t *r = src->p_region; r != NULL; r = r->p_next) {
434 assert(r->p_picture && r->i_align == 0);
435 if (filter_ConfigureBlend(blend, dst->format.i_width, dst->format.i_height,
437 filter_Blend(blend, dst,
438 r->i_x, r->i_y, r->p_picture,
439 src->i_alpha * r->i_alpha / 255)) {
440 msg_Err(blend, "blending %4.4s to %4.4s failed",
441 (char *)&blend->fmt_in.video.i_chroma,
442 (char *)&blend->fmt_out.video.i_chroma );