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1 /*****************************************************************************
2  * picture.c : picture management functions
3  *****************************************************************************
4  * Copyright (C) 2000-2010 VLC authors and VideoLAN
5  * Copyright (C) 2009-2010 Laurent Aimar
6  * $Id$
7  *
8  * Authors: Vincent Seguin <seguin@via.ecp.fr>
9  *          Samuel Hocevar <sam@zoy.org>
10  *          Laurent Aimar <fenrir _AT_ videolan _DOT_ org>
11  *
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.
16  *
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.
21  *
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  *****************************************************************************/
26
27 /*****************************************************************************
28  * Preamble
29  *****************************************************************************/
30
31 #ifdef HAVE_CONFIG_H
32 # include "config.h"
33 #endif
34 #include <assert.h>
35
36 #include <vlc_common.h>
37 #include <vlc_picture.h>
38 #include <vlc_image.h>
39 #include <vlc_block.h>
40
41 /**
42  * Allocate a new picture in the heap.
43  *
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.
47  */
48 static int AllocatePicture( picture_t *p_pic )
49 {
50     /* Calculate how big the new image should be */
51     size_t i_bytes = 0;
52     for( int i = 0; i < p_pic->i_planes; i++ )
53     {
54         const plane_t *p = &p_pic->p[i];
55
56         if( p->i_pitch < 0 || p->i_lines <= 0 ||
57             (size_t)p->i_pitch > (SIZE_MAX - i_bytes)/p->i_lines )
58         {
59             p_pic->i_planes = 0;
60             return VLC_ENOMEM;
61         }
62         i_bytes += p->i_pitch * p->i_lines;
63     }
64
65     uint8_t *p_data = vlc_memalign( 16, i_bytes );
66     if( i_bytes > 0 && p_data == NULL )
67     {
68         p_pic->i_planes = 0;
69         return VLC_EGENERIC;
70     }
71     p_pic->gc.p_sys = (void *)p_data;
72
73     /* Fill the p_pixels field for each plane */
74     p_pic->p[0].p_pixels = p_data;
75     for( int i = 1; i < p_pic->i_planes; i++ )
76     {
77         p_pic->p[i].p_pixels = &p_pic->p[i-1].p_pixels[ p_pic->p[i-1].i_lines *
78                                                         p_pic->p[i-1].i_pitch ];
79     }
80
81     return VLC_SUCCESS;
82 }
83
84 /*****************************************************************************
85  *
86  *****************************************************************************/
87
88 static void PictureDestroyContext( picture_t *p_picture )
89 {
90     void (**context)( void * ) = p_picture->context;
91     if( context != NULL )
92     {
93         void (*context_destroy)( void * ) = *context;
94         context_destroy( context );
95         p_picture->context = NULL;
96     }
97 }
98
99 static void PictureDestroy( picture_t *p_picture )
100 {
101     assert( p_picture &&
102             atomic_load( &p_picture->gc.refcount ) == 0 );
103
104     vlc_free( p_picture->gc.p_sys );
105     free( p_picture->p_sys );
106     free( p_picture );
107 }
108
109 /*****************************************************************************
110  *
111  *****************************************************************************/
112 void picture_Reset( picture_t *p_picture )
113 {
114     /* */
115     p_picture->date = VLC_TS_INVALID;
116     p_picture->b_force = false;
117     p_picture->b_progressive = false;
118     p_picture->i_nb_fields = 2;
119     p_picture->b_top_field_first = false;
120     PictureDestroyContext( p_picture );
121 }
122
123 /*****************************************************************************
124  *
125  *****************************************************************************/
126 static int LCM( int a, int b )
127 {
128     return a * b / GCD( a, b );
129 }
130
131 int picture_Setup( picture_t *p_picture, vlc_fourcc_t i_chroma,
132                    int i_width, int i_height, int i_sar_num, int i_sar_den )
133 {
134     /* Store default values */
135     p_picture->i_planes = 0;
136     for( unsigned i = 0; i < VOUT_MAX_PLANES; i++ )
137     {
138         plane_t *p = &p_picture->p[i];
139         p->p_pixels = NULL;
140         p->i_pixel_pitch = 0;
141     }
142
143     atomic_init( &p_picture->gc.refcount, 0 );
144     p_picture->gc.pf_destroy = NULL;
145     p_picture->gc.p_sys = NULL;
146
147     p_picture->i_nb_fields = 2;
148
149     video_format_Setup( &p_picture->format, i_chroma, i_width, i_height,
150                         i_sar_num, i_sar_den );
151
152     const vlc_chroma_description_t *p_dsc =
153         vlc_fourcc_GetChromaDescription( p_picture->format.i_chroma );
154     if( !p_dsc )
155         return VLC_EGENERIC;
156
157     /* We want V (width/height) to respect:
158         (V * p_dsc->p[i].w.i_num) % p_dsc->p[i].w.i_den == 0
159         (V * p_dsc->p[i].w.i_num/p_dsc->p[i].w.i_den * p_dsc->i_pixel_size) % 16 == 0
160        Which is respected if you have
161        V % lcm( p_dsc->p[0..planes].w.i_den * 16) == 0
162     */
163     int i_modulo_w = 1;
164     int i_modulo_h = 1;
165     unsigned int i_ratio_h  = 1;
166     for( unsigned i = 0; i < p_dsc->plane_count; i++ )
167     {
168         i_modulo_w = LCM( i_modulo_w, 16 * p_dsc->p[i].w.den );
169         i_modulo_h = LCM( i_modulo_h, 16 * p_dsc->p[i].h.den );
170         if( i_ratio_h < p_dsc->p[i].h.den )
171             i_ratio_h = p_dsc->p[i].h.den;
172     }
173     i_modulo_h = LCM( i_modulo_h, 32 );
174
175     const int i_width_aligned  = ( i_width  + i_modulo_w - 1 ) / i_modulo_w * i_modulo_w;
176     const int i_height_aligned = ( i_height + i_modulo_h - 1 ) / i_modulo_h * i_modulo_h;
177     const int i_height_extra   = 2 * i_ratio_h; /* This one is a hack for some ASM functions */
178     for( unsigned i = 0; i < p_dsc->plane_count; i++ )
179     {
180         plane_t *p = &p_picture->p[i];
181
182         p->i_lines         = (i_height_aligned + i_height_extra ) * p_dsc->p[i].h.num / p_dsc->p[i].h.den;
183         p->i_visible_lines = i_height * p_dsc->p[i].h.num / p_dsc->p[i].h.den;
184         p->i_pitch         = i_width_aligned * p_dsc->p[i].w.num / p_dsc->p[i].w.den * p_dsc->pixel_size;
185         p->i_visible_pitch = i_width * p_dsc->p[i].w.num / p_dsc->p[i].w.den * p_dsc->pixel_size;
186         p->i_pixel_pitch   = p_dsc->pixel_size;
187
188         assert( (p->i_pitch % 16) == 0 );
189     }
190     p_picture->i_planes  = p_dsc->plane_count;
191
192     return VLC_SUCCESS;
193 }
194
195 /*****************************************************************************
196  *
197  *****************************************************************************/
198 picture_t *picture_NewFromResource( const video_format_t *p_fmt, const picture_resource_t *p_resource )
199 {
200     video_format_t fmt = *p_fmt;
201
202     /* It is needed to be sure all information are filled */
203     video_format_Setup( &fmt, p_fmt->i_chroma,
204                               p_fmt->i_width, p_fmt->i_height,
205                               p_fmt->i_sar_num, p_fmt->i_sar_den );
206     if( p_fmt->i_x_offset < p_fmt->i_width &&
207         p_fmt->i_y_offset < p_fmt->i_height &&
208         p_fmt->i_visible_width  > 0 && p_fmt->i_x_offset + p_fmt->i_visible_width  <= p_fmt->i_width &&
209         p_fmt->i_visible_height > 0 && p_fmt->i_y_offset + p_fmt->i_visible_height <= p_fmt->i_height )
210         video_format_CopyCrop( &fmt, p_fmt );
211
212     /* */
213     picture_t *p_picture = calloc( 1, sizeof(*p_picture) );
214     if( !p_picture )
215         return NULL;
216
217     /* Make sure the real dimensions are a multiple of 16 */
218     if( picture_Setup( p_picture, fmt.i_chroma, fmt.i_width, fmt.i_height,
219                        fmt.i_sar_num, fmt.i_sar_den ) )
220     {
221         free( p_picture );
222         return NULL;
223     }
224
225     if( p_resource )
226     {
227         p_picture->p_sys = p_resource->p_sys;
228         p_picture->gc.pf_destroy = p_resource->pf_destroy;
229         assert( p_picture->gc.p_sys == NULL );
230
231         for( int i = 0; i < p_picture->i_planes; i++ )
232         {
233             p_picture->p[i].p_pixels = p_resource->p[i].p_pixels;
234             p_picture->p[i].i_lines  = p_resource->p[i].i_lines;
235             p_picture->p[i].i_pitch  = p_resource->p[i].i_pitch;
236         }
237     }
238     else
239     {
240         if( AllocatePicture( p_picture ) )
241         {
242             free( p_picture );
243             return NULL;
244         }
245     }
246
247     /* */
248     p_picture->format = fmt;
249
250     atomic_init( &p_picture->gc.refcount, 1 );
251     if( p_picture->gc.pf_destroy == NULL )
252         p_picture->gc.pf_destroy = PictureDestroy;
253
254     return p_picture;
255 }
256
257 picture_t *picture_NewFromFormat( const video_format_t *p_fmt )
258 {
259     return picture_NewFromResource( p_fmt, NULL );
260 }
261
262 picture_t *picture_New( vlc_fourcc_t i_chroma, int i_width, int i_height, int i_sar_num, int i_sar_den )
263 {
264     video_format_t fmt;
265
266     memset( &fmt, 0, sizeof(fmt) );
267     video_format_Setup( &fmt, i_chroma, i_width, i_height,
268                         i_sar_num, i_sar_den );
269
270     return picture_NewFromFormat( &fmt );
271 }
272
273 /*****************************************************************************
274  *
275  *****************************************************************************/
276
277 picture_t *picture_Hold( picture_t *p_picture )
278 {
279     atomic_fetch_add( &p_picture->gc.refcount, 1 );
280     return p_picture;
281 }
282
283 void picture_Release( picture_t *p_picture )
284 {
285     uintptr_t refs = atomic_fetch_sub( &p_picture->gc.refcount, 1 );
286     assert( refs != 0 );
287     if( refs > 1 )
288         return;
289
290     PictureDestroyContext( p_picture );
291     assert( p_picture->gc.pf_destroy != NULL );
292     p_picture->gc.pf_destroy( p_picture );
293 }
294
295 bool picture_IsReferenced( picture_t *p_picture )
296 {
297     return atomic_load( &p_picture->gc.refcount ) > 1;
298 }
299
300 /*****************************************************************************
301  *
302  *****************************************************************************/
303 void plane_CopyPixels( plane_t *p_dst, const plane_t *p_src )
304 {
305     const unsigned i_width  = __MIN( p_dst->i_visible_pitch,
306                                      p_src->i_visible_pitch );
307     const unsigned i_height = __MIN( p_dst->i_visible_lines,
308                                      p_src->i_visible_lines );
309
310     /* The 2x visible pitch check does two things:
311        1) Makes field plane_t's work correctly (see the deinterlacer module)
312        2) Moves less data if the pitch and visible pitch differ much.
313     */
314     if( p_src->i_pitch == p_dst->i_pitch  &&
315         p_src->i_pitch < 2*p_src->i_visible_pitch )
316     {
317         /* There are margins, but with the same width : perfect ! */
318         memcpy( p_dst->p_pixels, p_src->p_pixels,
319                     p_src->i_pitch * i_height );
320     }
321     else
322     {
323         /* We need to proceed line by line */
324         uint8_t *p_in = p_src->p_pixels;
325         uint8_t *p_out = p_dst->p_pixels;
326         int i_line;
327
328         assert( p_in );
329         assert( p_out );
330
331         for( i_line = i_height; i_line--; )
332         {
333             memcpy( p_out, p_in, i_width );
334             p_in += p_src->i_pitch;
335             p_out += p_dst->i_pitch;
336         }
337     }
338 }
339
340 void picture_CopyProperties( picture_t *p_dst, const picture_t *p_src )
341 {
342     p_dst->date = p_src->date;
343     p_dst->b_force = p_src->b_force;
344
345     p_dst->b_progressive = p_src->b_progressive;
346     p_dst->i_nb_fields = p_src->i_nb_fields;
347     p_dst->b_top_field_first = p_src->b_top_field_first;
348 }
349
350 void picture_CopyPixels( picture_t *p_dst, const picture_t *p_src )
351 {
352     int i;
353
354     for( i = 0; i < p_src->i_planes ; i++ )
355         plane_CopyPixels( p_dst->p+i, p_src->p+i );
356 }
357
358 void picture_Copy( picture_t *p_dst, const picture_t *p_src )
359 {
360     picture_CopyPixels( p_dst, p_src );
361     picture_CopyProperties( p_dst, p_src );
362 }
363
364
365 /*****************************************************************************
366  *
367  *****************************************************************************/
368 int picture_Export( vlc_object_t *p_obj,
369                     block_t **pp_image,
370                     video_format_t *p_fmt,
371                     picture_t *p_picture,
372                     vlc_fourcc_t i_format,
373                     int i_override_width, int i_override_height )
374 {
375     /* */
376     video_format_t fmt_in = p_picture->format;
377     if( fmt_in.i_sar_num <= 0 || fmt_in.i_sar_den <= 0 )
378     {
379         fmt_in.i_sar_num =
380         fmt_in.i_sar_den = 1;
381     }
382
383     /* */
384     video_format_t fmt_out;
385     memset( &fmt_out, 0, sizeof(fmt_out) );
386     fmt_out.i_sar_num =
387     fmt_out.i_sar_den = 1;
388     fmt_out.i_chroma  = i_format;
389
390     /* compute original width/height */
391     unsigned int i_original_width;
392     unsigned int i_original_height;
393     if( fmt_in.i_sar_num >= fmt_in.i_sar_den )
394     {
395         i_original_width = (int64_t)fmt_in.i_width * fmt_in.i_sar_num / fmt_in.i_sar_den;
396         i_original_height = fmt_in.i_height;
397     }
398     else
399     {
400         i_original_width =  fmt_in.i_width;
401         i_original_height = (int64_t)fmt_in.i_height * fmt_in.i_sar_den / fmt_in.i_sar_num;
402     }
403
404     /* */
405     fmt_out.i_width  = ( i_override_width < 0 ) ?
406                        i_original_width : (unsigned)i_override_width;
407     fmt_out.i_height = ( i_override_height < 0 ) ?
408                        i_original_height : (unsigned)i_override_height;
409
410     /* scale if only one direction is provided */
411     if( fmt_out.i_height == 0 && fmt_out.i_width > 0 )
412     {
413         fmt_out.i_height = fmt_in.i_height * fmt_out.i_width
414                      * fmt_in.i_sar_den / fmt_in.i_width / fmt_in.i_sar_num;
415     }
416     else if( fmt_out.i_width == 0 && fmt_out.i_height > 0 )
417     {
418         fmt_out.i_width  = fmt_in.i_width * fmt_out.i_height
419                      * fmt_in.i_sar_num / fmt_in.i_height / fmt_in.i_sar_den;
420     }
421
422     image_handler_t *p_image = image_HandlerCreate( p_obj );
423
424     block_t *p_block = image_Write( p_image, p_picture, &fmt_in, &fmt_out );
425
426     image_HandlerDelete( p_image );
427
428     if( !p_block )
429         return VLC_EGENERIC;
430
431     p_block->i_pts =
432     p_block->i_dts = p_picture->date;
433
434     if( p_fmt )
435         *p_fmt = fmt_out;
436     *pp_image = p_block;
437
438     return VLC_SUCCESS;
439 }
440
441 unsigned picture_BlendSubpicture(picture_t *dst,
442                                  filter_t *blend, subpicture_t *src)
443 {
444     unsigned done = 0;
445
446     assert(src && !src->b_fade && src->b_absolute);
447
448     for (subpicture_region_t *r = src->p_region; r != NULL; r = r->p_next) {
449         assert(r->p_picture && r->i_align == 0);
450         if (filter_ConfigureBlend(blend, dst->format.i_width,
451                                   dst->format.i_height,  &r->fmt)
452          || filter_Blend(blend, dst, r->i_x, r->i_y, r->p_picture,
453                          src->i_alpha * r->i_alpha / 255))
454             msg_Err(blend, "blending %4.4s to %4.4s failed",
455                     (char *)&blend->fmt_in.video.i_chroma,
456                     (char *)&blend->fmt_out.video.i_chroma );
457         else
458             done++;
459     }
460     return done;
461 }