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>
42 * Allocate a new picture in the heap.
44 * This function allocates a fake direct buffer in memory, which can be
45 * used exactly like a video buffer. The video output thread then manages
46 * how it gets displayed.
48 static int AllocatePicture( picture_t *p_pic )
50 /* Calculate how big the new image should be */
52 for( int i = 0; i < p_pic->i_planes; i++ )
54 const plane_t *p = &p_pic->p[i];
56 if( p->i_pitch < 0 || p->i_lines <= 0 ||
57 (size_t)p->i_pitch > (SIZE_MAX - i_bytes)/p->i_lines )
62 i_bytes += p->i_pitch * p->i_lines;
65 uint8_t *p_data = vlc_memalign( 16, i_bytes );
66 if( i_bytes > 0 && p_data == NULL )
72 /* Fill the p_pixels field for each plane */
73 p_pic->p[0].p_pixels = p_data;
74 for( int i = 1; i < p_pic->i_planes; i++ )
76 p_pic->p[i].p_pixels = &p_pic->p[i-1].p_pixels[ p_pic->p[i-1].i_lines *
77 p_pic->p[i-1].i_pitch ];
83 /*****************************************************************************
85 *****************************************************************************/
87 static void PictureDestroyContext( picture_t *p_picture )
89 void (**context)( void * ) = p_picture->context;
92 void (*context_destroy)( void * ) = *context;
93 context_destroy( context );
94 p_picture->context = NULL;
99 * Destroys a picture allocated by picture_NewFromResource() but without
100 * a custom destruction callback.
102 static void picture_DestroyFromResource( picture_t *p_picture )
104 free( p_picture->p_sys );
109 * Destroys a picture allocated with picture_NewFromFormat()
110 * (and thus AllocatePicture()).
112 static void picture_Destroy( picture_t *p_picture )
114 vlc_free( p_picture->p[0].p_pixels );
118 /*****************************************************************************
120 *****************************************************************************/
121 void picture_Reset( picture_t *p_picture )
124 p_picture->date = VLC_TS_INVALID;
125 p_picture->b_force = false;
126 p_picture->b_progressive = false;
127 p_picture->i_nb_fields = 2;
128 p_picture->b_top_field_first = false;
129 PictureDestroyContext( p_picture );
132 /*****************************************************************************
134 *****************************************************************************/
135 static int LCM( int a, int b )
137 return a * b / GCD( a, b );
140 int picture_Setup( picture_t *p_picture, const video_format_t *restrict fmt )
142 /* Store default values */
143 p_picture->i_planes = 0;
144 for( unsigned i = 0; i < VOUT_MAX_PLANES; i++ )
146 plane_t *p = &p_picture->p[i];
148 p->i_pixel_pitch = 0;
151 atomic_init( &p_picture->gc.refcount, 0 );
152 p_picture->gc.p_sys = NULL;
154 p_picture->i_nb_fields = 2;
156 video_format_Setup( &p_picture->format, fmt->i_chroma, fmt->i_width, fmt->i_height,
157 fmt->i_visible_width, fmt->i_visible_height,
158 fmt->i_sar_num, fmt->i_sar_den );
160 const vlc_chroma_description_t *p_dsc =
161 vlc_fourcc_GetChromaDescription( p_picture->format.i_chroma );
165 /* We want V (width/height) to respect:
166 (V * p_dsc->p[i].w.i_num) % p_dsc->p[i].w.i_den == 0
167 (V * p_dsc->p[i].w.i_num/p_dsc->p[i].w.i_den * p_dsc->i_pixel_size) % 16 == 0
168 Which is respected if you have
169 V % lcm( p_dsc->p[0..planes].w.i_den * 16) == 0
173 unsigned int i_ratio_h = 1;
174 for( unsigned i = 0; i < p_dsc->plane_count; i++ )
176 i_modulo_w = LCM( i_modulo_w, 16 * p_dsc->p[i].w.den );
177 i_modulo_h = LCM( i_modulo_h, 16 * p_dsc->p[i].h.den );
178 if( i_ratio_h < p_dsc->p[i].h.den )
179 i_ratio_h = p_dsc->p[i].h.den;
181 i_modulo_h = LCM( i_modulo_h, 32 );
183 const int i_width_aligned = ( fmt->i_width + i_modulo_w - 1 ) / i_modulo_w * i_modulo_w;
184 const int i_height_aligned = ( fmt->i_height + i_modulo_h - 1 ) / i_modulo_h * i_modulo_h;
185 const int i_height_extra = 2 * i_ratio_h; /* This one is a hack for some ASM functions */
186 for( unsigned i = 0; i < p_dsc->plane_count; i++ )
188 plane_t *p = &p_picture->p[i];
190 p->i_lines = (i_height_aligned + i_height_extra ) * p_dsc->p[i].h.num / p_dsc->p[i].h.den;
191 p->i_visible_lines = fmt->i_visible_height * p_dsc->p[i].h.num / p_dsc->p[i].h.den;
192 p->i_pitch = i_width_aligned * p_dsc->p[i].w.num / p_dsc->p[i].w.den * p_dsc->pixel_size;
193 p->i_visible_pitch = fmt->i_visible_width * p_dsc->p[i].w.num / p_dsc->p[i].w.den * p_dsc->pixel_size;
194 p->i_pixel_pitch = p_dsc->pixel_size;
196 assert( (p->i_pitch % 16) == 0 );
198 p_picture->i_planes = p_dsc->plane_count;
203 /*****************************************************************************
205 *****************************************************************************/
206 picture_t *picture_NewFromResource( const video_format_t *p_fmt, const picture_resource_t *p_resource )
208 video_format_t fmt = *p_fmt;
210 /* It is needed to be sure all information are filled */
211 video_format_Setup( &fmt, p_fmt->i_chroma,
212 p_fmt->i_width, p_fmt->i_height,
213 p_fmt->i_visible_width, p_fmt->i_visible_height,
214 p_fmt->i_sar_num, p_fmt->i_sar_den );
215 if( p_fmt->i_x_offset < p_fmt->i_width &&
216 p_fmt->i_y_offset < p_fmt->i_height &&
217 p_fmt->i_visible_width > 0 && p_fmt->i_x_offset + p_fmt->i_visible_width <= p_fmt->i_width &&
218 p_fmt->i_visible_height > 0 && p_fmt->i_y_offset + p_fmt->i_visible_height <= p_fmt->i_height )
219 video_format_CopyCrop( &fmt, p_fmt );
222 picture_t *p_picture = calloc( 1, sizeof(*p_picture) );
226 /* Make sure the real dimensions are a multiple of 16 */
227 if( picture_Setup( p_picture, &fmt ) )
235 p_picture->p_sys = p_resource->p_sys;
236 p_picture->gc.pf_destroy = p_resource->pf_destroy;
237 if( p_picture->gc.pf_destroy == NULL )
238 p_picture->gc.pf_destroy = picture_DestroyFromResource;
240 for( int i = 0; i < p_picture->i_planes; i++ )
242 p_picture->p[i].p_pixels = p_resource->p[i].p_pixels;
243 p_picture->p[i].i_lines = p_resource->p[i].i_lines;
244 p_picture->p[i].i_pitch = p_resource->p[i].i_pitch;
249 if( AllocatePicture( p_picture ) )
254 p_picture->gc.pf_destroy = picture_Destroy;
258 p_picture->format = fmt;
260 atomic_init( &p_picture->gc.refcount, 1 );
265 picture_t *picture_NewFromFormat( const video_format_t *p_fmt )
267 return picture_NewFromResource( p_fmt, NULL );
270 picture_t *picture_New( vlc_fourcc_t i_chroma, int i_width, int i_height, int i_sar_num, int i_sar_den )
274 memset( &fmt, 0, sizeof(fmt) );
275 video_format_Setup( &fmt, i_chroma, i_width, i_height,
276 i_width, i_height, i_sar_num, i_sar_den );
278 return picture_NewFromFormat( &fmt );
281 /*****************************************************************************
283 *****************************************************************************/
285 picture_t *picture_Hold( picture_t *p_picture )
287 atomic_fetch_add( &p_picture->gc.refcount, 1 );
291 void picture_Release( picture_t *p_picture )
293 assert( p_picture != NULL );
295 uintptr_t refs = atomic_fetch_sub( &p_picture->gc.refcount, 1 );
300 PictureDestroyContext( p_picture );
301 assert( p_picture->gc.pf_destroy != NULL );
302 p_picture->gc.pf_destroy( p_picture );
305 bool picture_IsReferenced( picture_t *p_picture )
307 return atomic_load( &p_picture->gc.refcount ) > 1;
310 /*****************************************************************************
312 *****************************************************************************/
313 void plane_CopyPixels( plane_t *p_dst, const plane_t *p_src )
315 const unsigned i_width = __MIN( p_dst->i_visible_pitch,
316 p_src->i_visible_pitch );
317 const unsigned i_height = __MIN( p_dst->i_visible_lines,
318 p_src->i_visible_lines );
320 /* The 2x visible pitch check does two things:
321 1) Makes field plane_t's work correctly (see the deinterlacer module)
322 2) Moves less data if the pitch and visible pitch differ much.
324 if( p_src->i_pitch == p_dst->i_pitch &&
325 p_src->i_pitch < 2*p_src->i_visible_pitch )
327 /* There are margins, but with the same width : perfect ! */
328 memcpy( p_dst->p_pixels, p_src->p_pixels,
329 p_src->i_pitch * i_height );
333 /* We need to proceed line by line */
334 uint8_t *p_in = p_src->p_pixels;
335 uint8_t *p_out = p_dst->p_pixels;
341 for( i_line = i_height; i_line--; )
343 memcpy( p_out, p_in, i_width );
344 p_in += p_src->i_pitch;
345 p_out += p_dst->i_pitch;
350 void picture_CopyProperties( picture_t *p_dst, const picture_t *p_src )
352 p_dst->date = p_src->date;
353 p_dst->b_force = p_src->b_force;
355 p_dst->b_progressive = p_src->b_progressive;
356 p_dst->i_nb_fields = p_src->i_nb_fields;
357 p_dst->b_top_field_first = p_src->b_top_field_first;
360 void picture_CopyPixels( picture_t *p_dst, const picture_t *p_src )
364 for( i = 0; i < p_src->i_planes ; i++ )
365 plane_CopyPixels( p_dst->p+i, p_src->p+i );
368 void picture_Copy( picture_t *p_dst, const picture_t *p_src )
370 picture_CopyPixels( p_dst, p_src );
371 picture_CopyProperties( p_dst, p_src );
375 /*****************************************************************************
377 *****************************************************************************/
378 int picture_Export( vlc_object_t *p_obj,
380 video_format_t *p_fmt,
381 picture_t *p_picture,
382 vlc_fourcc_t i_format,
383 int i_override_width, int i_override_height )
386 video_format_t fmt_in = p_picture->format;
387 if( fmt_in.i_sar_num <= 0 || fmt_in.i_sar_den <= 0 )
390 fmt_in.i_sar_den = 1;
394 video_format_t fmt_out;
395 memset( &fmt_out, 0, sizeof(fmt_out) );
397 fmt_out.i_sar_den = 1;
398 fmt_out.i_chroma = i_format;
400 /* compute original width/height */
401 unsigned int i_original_width;
402 unsigned int i_original_height;
403 if( fmt_in.i_sar_num >= fmt_in.i_sar_den )
405 i_original_width = (int64_t)fmt_in.i_width * fmt_in.i_sar_num / fmt_in.i_sar_den;
406 i_original_height = fmt_in.i_height;
410 i_original_width = fmt_in.i_width;
411 i_original_height = (int64_t)fmt_in.i_height * fmt_in.i_sar_den / fmt_in.i_sar_num;
415 fmt_out.i_width = ( i_override_width < 0 ) ?
416 i_original_width : (unsigned)i_override_width;
417 fmt_out.i_height = ( i_override_height < 0 ) ?
418 i_original_height : (unsigned)i_override_height;
420 /* scale if only one direction is provided */
421 if( fmt_out.i_height == 0 && fmt_out.i_width > 0 )
423 fmt_out.i_height = fmt_in.i_height * fmt_out.i_width
424 * fmt_in.i_sar_den / fmt_in.i_width / fmt_in.i_sar_num;
426 else if( fmt_out.i_width == 0 && fmt_out.i_height > 0 )
428 fmt_out.i_width = fmt_in.i_width * fmt_out.i_height
429 * fmt_in.i_sar_num / fmt_in.i_height / fmt_in.i_sar_den;
432 image_handler_t *p_image = image_HandlerCreate( p_obj );
434 block_t *p_block = image_Write( p_image, p_picture, &fmt_in, &fmt_out );
436 image_HandlerDelete( p_image );
442 p_block->i_dts = p_picture->date;
451 unsigned picture_BlendSubpicture(picture_t *dst,
452 filter_t *blend, subpicture_t *src)
456 assert(src && !src->b_fade && src->b_absolute);
458 for (subpicture_region_t *r = src->p_region; r != NULL; r = r->p_next) {
459 assert(r->p_picture && r->i_align == 0);
460 if (filter_ConfigureBlend(blend, dst->format.i_width,
461 dst->format.i_height, &r->fmt)
462 || filter_Blend(blend, dst, r->i_x, r->i_y, r->p_picture,
463 src->i_alpha * r->i_alpha / 255))
464 msg_Err(blend, "blending %4.4s to %4.4s failed",
465 (char *)&blend->fmt_in.video.i_chroma,
466 (char *)&blend->fmt_out.video.i_chroma );