]> git.sesse.net Git - vlc/blob - src/misc/picture.c
picture: pointer for decoder-specified hardware context
[vlc] / src / misc / picture.c
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 #include <vlc_atomic.h>
41
42 /**
43  * Allocate a new picture in the heap.
44  *
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.
48  */
49 static int AllocatePicture( picture_t *p_pic )
50 {
51     /* Calculate how big the new image should be */
52     size_t i_bytes = 0;
53     for( int i = 0; i < p_pic->i_planes; i++ )
54     {
55         const plane_t *p = &p_pic->p[i];
56
57         if( p->i_pitch < 0 || p->i_lines <= 0 ||
58             (size_t)p->i_pitch > (SIZE_MAX - i_bytes)/p->i_lines )
59         {
60             p_pic->i_planes = 0;
61             return VLC_ENOMEM;
62         }
63         i_bytes += p->i_pitch * p->i_lines;
64     }
65
66     uint8_t *p_data = vlc_memalign( 16, i_bytes );
67     if( i_bytes > 0 && p_data == NULL )
68     {
69         p_pic->i_planes = 0;
70         return VLC_EGENERIC;
71     }
72     p_pic->gc.p_sys = (void *)p_data;
73
74     /* Fill the p_pixels field for each plane */
75     p_pic->p[0].p_pixels = p_data;
76     for( int i = 1; i < p_pic->i_planes; i++ )
77     {
78         p_pic->p[i].p_pixels = &p_pic->p[i-1].p_pixels[ p_pic->p[i-1].i_lines *
79                                                         p_pic->p[i-1].i_pitch ];
80     }
81
82     return VLC_SUCCESS;
83 }
84
85 /*****************************************************************************
86  *
87  *****************************************************************************/
88
89 static void PictureDestroyContext( picture_t *p_picture )
90 {
91     void (**context)( void * ) = p_picture->context;
92     if( context != NULL )
93     {
94         void (*context_destroy)( void * ) = *context;
95         context_destroy( context );
96         p_picture->context = NULL;
97     }
98 }
99
100 static void PictureDestroy( picture_t *p_picture )
101 {
102     assert( p_picture &&
103             vlc_atomic_get( &p_picture->gc.refcount ) == 0 );
104
105     vlc_free( p_picture->gc.p_sys );
106     free( p_picture->p_sys );
107     free( p_picture );
108 }
109
110 /*****************************************************************************
111  *
112  *****************************************************************************/
113 void picture_Reset( picture_t *p_picture )
114 {
115     /* */
116     p_picture->date = VLC_TS_INVALID;
117     p_picture->b_force = false;
118     p_picture->b_progressive = false;
119     p_picture->i_nb_fields = 2;
120     p_picture->b_top_field_first = false;
121     PictureDestroyContext( p_picture );
122 }
123
124 /*****************************************************************************
125  *
126  *****************************************************************************/
127 static int LCM( int a, int b )
128 {
129     return a * b / GCD( a, b );
130 }
131
132 int picture_Setup( picture_t *p_picture, vlc_fourcc_t i_chroma,
133                    int i_width, int i_height, int i_sar_num, int i_sar_den )
134 {
135     /* Store default values */
136     p_picture->i_planes = 0;
137     for( unsigned i = 0; i < VOUT_MAX_PLANES; i++ )
138     {
139         plane_t *p = &p_picture->p[i];
140         p->p_pixels = NULL;
141         p->i_pixel_pitch = 0;
142     }
143
144     vlc_atomic_set( &p_picture->gc.refcount, 0 );
145     p_picture->gc.pf_destroy = NULL;
146     p_picture->gc.p_sys = NULL;
147
148     p_picture->i_nb_fields = 2;
149
150     video_format_Setup( &p_picture->format, i_chroma, i_width, i_height,
151                         i_sar_num, i_sar_den );
152
153     const vlc_chroma_description_t *p_dsc =
154         vlc_fourcc_GetChromaDescription( p_picture->format.i_chroma );
155     if( !p_dsc )
156         return VLC_EGENERIC;
157
158     /* We want V (width/height) to respect:
159         (V * p_dsc->p[i].w.i_num) % p_dsc->p[i].w.i_den == 0
160         (V * p_dsc->p[i].w.i_num/p_dsc->p[i].w.i_den * p_dsc->i_pixel_size) % 16 == 0
161        Which is respected if you have
162        V % lcm( p_dsc->p[0..planes].w.i_den * 16) == 0
163     */
164     int i_modulo_w = 1;
165     int i_modulo_h = 1;
166     unsigned int i_ratio_h  = 1;
167     for( unsigned i = 0; i < p_dsc->plane_count; i++ )
168     {
169         i_modulo_w = LCM( i_modulo_w, 16 * p_dsc->p[i].w.den );
170         i_modulo_h = LCM( i_modulo_h, 16 * p_dsc->p[i].h.den );
171         if( i_ratio_h < p_dsc->p[i].h.den )
172             i_ratio_h = p_dsc->p[i].h.den;
173     }
174     i_modulo_h = LCM( i_modulo_h, 32 );
175
176     const int i_width_aligned  = ( i_width  + i_modulo_w - 1 ) / i_modulo_w * i_modulo_w;
177     const int i_height_aligned = ( i_height + i_modulo_h - 1 ) / i_modulo_h * i_modulo_h;
178     const int i_height_extra   = 2 * i_ratio_h; /* This one is a hack for some ASM functions */
179     for( unsigned i = 0; i < p_dsc->plane_count; i++ )
180     {
181         plane_t *p = &p_picture->p[i];
182
183         p->i_lines         = (i_height_aligned + i_height_extra ) * p_dsc->p[i].h.num / p_dsc->p[i].h.den;
184         p->i_visible_lines = i_height * p_dsc->p[i].h.num / p_dsc->p[i].h.den;
185         p->i_pitch         = i_width_aligned * p_dsc->p[i].w.num / p_dsc->p[i].w.den * p_dsc->pixel_size;
186         p->i_visible_pitch = i_width * p_dsc->p[i].w.num / p_dsc->p[i].w.den * p_dsc->pixel_size;
187         p->i_pixel_pitch   = p_dsc->pixel_size;
188
189         assert( (p->i_pitch % 16) == 0 );
190     }
191     p_picture->i_planes  = p_dsc->plane_count;
192
193     return VLC_SUCCESS;
194 }
195
196 /*****************************************************************************
197  *
198  *****************************************************************************/
199 picture_t *picture_NewFromResource( const video_format_t *p_fmt, const picture_resource_t *p_resource )
200 {
201     video_format_t fmt = *p_fmt;
202
203     /* It is needed to be sure all information are filled */
204     video_format_Setup( &fmt, p_fmt->i_chroma,
205                               p_fmt->i_width, p_fmt->i_height,
206                               p_fmt->i_sar_num, p_fmt->i_sar_den );
207     if( p_fmt->i_x_offset < p_fmt->i_width &&
208         p_fmt->i_y_offset < p_fmt->i_height &&
209         p_fmt->i_visible_width  > 0 && p_fmt->i_x_offset + p_fmt->i_visible_width  <= p_fmt->i_width &&
210         p_fmt->i_visible_height > 0 && p_fmt->i_y_offset + p_fmt->i_visible_height <= p_fmt->i_height )
211         video_format_CopyCrop( &fmt, p_fmt );
212
213     /* */
214     picture_t *p_picture = calloc( 1, sizeof(*p_picture) );
215     if( !p_picture )
216         return NULL;
217
218     /* Make sure the real dimensions are a multiple of 16 */
219     if( picture_Setup( p_picture, fmt.i_chroma, fmt.i_width, fmt.i_height,
220                        fmt.i_sar_num, fmt.i_sar_den ) )
221     {
222         free( p_picture );
223         return NULL;
224     }
225
226     if( p_resource )
227     {
228         p_picture->p_sys = p_resource->p_sys;
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         assert( p_picture->gc.p_sys != NULL );
246     }
247     /* */
248     p_picture->format = fmt;
249
250     vlc_atomic_set( &p_picture->gc.refcount, 1 );
251     p_picture->gc.pf_destroy = PictureDestroy;
252
253     return p_picture;
254 }
255 picture_t *picture_NewFromFormat( const video_format_t *p_fmt )
256 {
257     return picture_NewFromResource( p_fmt, NULL );
258 }
259 picture_t *picture_New( vlc_fourcc_t i_chroma, int i_width, int i_height, int i_sar_num, int i_sar_den )
260 {
261     video_format_t fmt;
262
263     memset( &fmt, 0, sizeof(fmt) );
264     video_format_Setup( &fmt, i_chroma, i_width, i_height,
265                         i_sar_num, i_sar_den );
266
267     return picture_NewFromFormat( &fmt );
268 }
269
270 /*****************************************************************************
271  *
272  *****************************************************************************/
273
274 picture_t *picture_Hold( picture_t *p_picture )
275 {
276     vlc_atomic_inc( &p_picture->gc.refcount );
277     return p_picture;
278 }
279
280 void picture_Release( picture_t *p_picture )
281 {
282     uintptr_t refs = vlc_atomic_dec( &p_picture->gc.refcount );
283     assert( refs != (uintptr_t)-1 );
284     if( refs > 0 )
285         return;
286
287     PictureDestroyContext( p_picture );
288     if( p_picture->gc.pf_destroy != NULL )
289         p_picture->gc.pf_destroy( p_picture );
290 }
291
292 bool picture_IsReferenced( picture_t *p_picture )
293 {
294     return vlc_atomic_get( &p_picture->gc.refcount ) > 1;
295 }
296
297 /*****************************************************************************
298  *
299  *****************************************************************************/
300 void plane_CopyPixels( plane_t *p_dst, const plane_t *p_src )
301 {
302     const unsigned i_width  = __MIN( p_dst->i_visible_pitch,
303                                      p_src->i_visible_pitch );
304     const unsigned i_height = __MIN( p_dst->i_visible_lines,
305                                      p_src->i_visible_lines );
306
307     /* The 2x visible pitch check does two things:
308        1) Makes field plane_t's work correctly (see the deinterlacer module)
309        2) Moves less data if the pitch and visible pitch differ much.
310     */
311     if( p_src->i_pitch == p_dst->i_pitch  &&
312         p_src->i_pitch < 2*p_src->i_visible_pitch )
313     {
314         /* There are margins, but with the same width : perfect ! */
315         memcpy( p_dst->p_pixels, p_src->p_pixels,
316                     p_src->i_pitch * i_height );
317     }
318     else
319     {
320         /* We need to proceed line by line */
321         uint8_t *p_in = p_src->p_pixels;
322         uint8_t *p_out = p_dst->p_pixels;
323         int i_line;
324
325         assert( p_in );
326         assert( p_out );
327
328         for( i_line = i_height; i_line--; )
329         {
330             memcpy( p_out, p_in, i_width );
331             p_in += p_src->i_pitch;
332             p_out += p_dst->i_pitch;
333         }
334     }
335 }
336
337 void picture_CopyProperties( picture_t *p_dst, const picture_t *p_src )
338 {
339     p_dst->date = p_src->date;
340     p_dst->b_force = p_src->b_force;
341
342     p_dst->b_progressive = p_src->b_progressive;
343     p_dst->i_nb_fields = p_src->i_nb_fields;
344     p_dst->b_top_field_first = p_src->b_top_field_first;
345 }
346
347 void picture_CopyPixels( picture_t *p_dst, const picture_t *p_src )
348 {
349     int i;
350
351     for( i = 0; i < p_src->i_planes ; i++ )
352         plane_CopyPixels( p_dst->p+i, p_src->p+i );
353 }
354
355 void picture_Copy( picture_t *p_dst, const picture_t *p_src )
356 {
357     picture_CopyPixels( p_dst, p_src );
358     picture_CopyProperties( p_dst, p_src );
359 }
360
361
362 /*****************************************************************************
363  *
364  *****************************************************************************/
365 int picture_Export( vlc_object_t *p_obj,
366                     block_t **pp_image,
367                     video_format_t *p_fmt,
368                     picture_t *p_picture,
369                     vlc_fourcc_t i_format,
370                     int i_override_width, int i_override_height )
371 {
372     /* */
373     video_format_t fmt_in = p_picture->format;
374     if( fmt_in.i_sar_num <= 0 || fmt_in.i_sar_den <= 0 )
375     {
376         fmt_in.i_sar_num =
377         fmt_in.i_sar_den = 1;
378     }
379
380     /* */
381     video_format_t fmt_out;
382     memset( &fmt_out, 0, sizeof(fmt_out) );
383     fmt_out.i_sar_num =
384     fmt_out.i_sar_den = 1;
385     fmt_out.i_chroma  = i_format;
386
387     /* compute original width/height */
388     unsigned int i_original_width;
389     unsigned int i_original_height;
390     if( fmt_in.i_sar_num >= fmt_in.i_sar_den )
391     {
392         i_original_width = (int64_t)fmt_in.i_width * fmt_in.i_sar_num / fmt_in.i_sar_den;
393         i_original_height = fmt_in.i_height;
394     }
395     else
396     {
397         i_original_width =  fmt_in.i_width;
398         i_original_height = (int64_t)fmt_in.i_height * fmt_in.i_sar_den / fmt_in.i_sar_num;
399     }
400
401     /* */
402     fmt_out.i_width  = ( i_override_width < 0 ) ?
403                        i_original_width : (unsigned)i_override_width;
404     fmt_out.i_height = ( i_override_height < 0 ) ?
405                        i_original_height : (unsigned)i_override_height;
406
407     /* scale if only one direction is provided */
408     if( fmt_out.i_height == 0 && fmt_out.i_width > 0 )
409     {
410         fmt_out.i_height = fmt_in.i_height * fmt_out.i_width
411                      * fmt_in.i_sar_den / fmt_in.i_width / fmt_in.i_sar_num;
412     }
413     else if( fmt_out.i_width == 0 && fmt_out.i_height > 0 )
414     {
415         fmt_out.i_width  = fmt_in.i_width * fmt_out.i_height
416                      * fmt_in.i_sar_num / fmt_in.i_height / fmt_in.i_sar_den;
417     }
418
419     image_handler_t *p_image = image_HandlerCreate( p_obj );
420
421     block_t *p_block = image_Write( p_image, p_picture, &fmt_in, &fmt_out );
422
423     image_HandlerDelete( p_image );
424
425     if( !p_block )
426         return VLC_EGENERIC;
427
428     p_block->i_pts =
429     p_block->i_dts = p_picture->date;
430
431     if( p_fmt )
432         *p_fmt = fmt_out;
433     *pp_image = p_block;
434
435     return VLC_SUCCESS;
436 }
437
438 void picture_BlendSubpicture(picture_t *dst,
439                              filter_t *blend, subpicture_t *src)
440 {
441     assert(src && !src->b_fade && src->b_absolute);
442
443     for (subpicture_region_t *r = src->p_region; r != NULL; r = r->p_next) {
444         assert(r->p_picture && r->i_align == 0);
445         if (filter_ConfigureBlend(blend, dst->format.i_width, dst->format.i_height,
446                                   &r->fmt) ||
447             filter_Blend(blend, dst,
448                          r->i_x, r->i_y, r->p_picture,
449                          src->i_alpha * r->i_alpha / 255)) {
450             msg_Err(blend, "blending %4.4s to %4.4s failed",
451                     (char *)&blend->fmt_in.video.i_chroma,
452                     (char *)&blend->fmt_out.video.i_chroma );
453         }
454     }
455 }