2 * mlt_frame.c -- interface for all frame classes
3 * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
4 * Author: Charles Yates <charles.yates@pandora.be>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software Foundation,
18 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
22 #include "mlt_frame.h"
29 mlt_image_format vfmt
;
34 mlt_audio_format afmt
;
39 static frame_test test_card
= { mlt_image_none
, 0, 0, NULL
, NULL
, mlt_audio_none
, NULL
};
41 /** Constructor for a frame.
44 mlt_frame
mlt_frame_init( )
47 mlt_frame
this = calloc( sizeof( struct mlt_frame_s
), 1 );
51 // Initialise the properties
52 mlt_properties properties
= &this->parent
;
53 mlt_properties_init( properties
, this );
55 // Set default properties on the frame
56 mlt_properties_set_timecode( properties
, "timecode", 0.0 );
57 mlt_properties_set_data( properties
, "image", NULL
, 0, NULL
, NULL
);
58 mlt_properties_set_int( properties
, "width", 720 );
59 mlt_properties_set_int( properties
, "height", 576 );
60 mlt_properties_set_double( properties
, "aspect_ratio", 4.0 / 3.0 );
61 mlt_properties_set_data( properties
, "audio", NULL
, 0, NULL
, NULL
);
62 mlt_properties_set_data( properties
, "alpha", NULL
, 0, NULL
, NULL
);
67 /** Fetch the frames properties.
70 mlt_properties
mlt_frame_properties( mlt_frame
this )
75 /** Check if we have a way to derive something other than a test card.
78 int mlt_frame_is_test_card( mlt_frame
this )
80 return this->stack_get_image_size
== 0;
83 /** Get the aspect ratio of the frame.
86 double mlt_frame_get_aspect_ratio( mlt_frame
this )
88 mlt_properties properties
= mlt_frame_properties( this );
89 return mlt_properties_get_double( properties
, "aspect_ratio" );
92 /** Set the aspect ratio of the frame.
95 int mlt_frame_set_aspect_ratio( mlt_frame
this, double value
)
97 mlt_properties properties
= mlt_frame_properties( this );
98 return mlt_properties_set_double( properties
, "aspect_ratio", value
);
101 /** Get the timecode of this frame.
104 mlt_timecode
mlt_frame_get_timecode( mlt_frame
this )
106 mlt_properties properties
= mlt_frame_properties( this );
107 return mlt_properties_get_timecode( properties
, "timecode" );
110 /** Set the timecode of this frame.
113 int mlt_frame_set_timecode( mlt_frame
this, mlt_timecode value
)
115 mlt_properties properties
= mlt_frame_properties( this );
116 return mlt_properties_set_timecode( properties
, "timecode", value
);
119 /** Stack a get_image callback.
122 int mlt_frame_push_get_image( mlt_frame
this, mlt_get_image get_image
)
124 int ret
= this->stack_get_image_size
>= 10;
126 this->stack_get_image
[ this->stack_get_image_size
++ ] = get_image
;
130 /** Pop a get_image callback.
133 mlt_get_image
mlt_frame_pop_get_image( mlt_frame
this )
135 mlt_get_image result
= NULL
;
136 if ( this->stack_get_image_size
> 0 )
137 result
= this->stack_get_image
[ -- this->stack_get_image_size
];
144 int mlt_frame_push_frame( mlt_frame
this, mlt_frame that
)
146 int ret
= this->stack_frame_size
>= 10;
148 this->stack_frame
[ this->stack_frame_size
++ ] = that
;
155 mlt_frame
mlt_frame_pop_frame( mlt_frame
this )
157 mlt_frame result
= NULL
;
158 if ( this->stack_frame_size
> 0 )
159 result
= this->stack_frame
[ -- this->stack_frame_size
];
163 int mlt_frame_get_image( mlt_frame
this, uint8_t **buffer
, mlt_image_format
*format
, int *width
, int *height
, int writable
)
165 mlt_properties properties
= mlt_frame_properties( this );
166 mlt_get_image get_image
= mlt_frame_pop_get_image( this );
168 if ( get_image
!= NULL
)
170 return get_image( this, buffer
, format
, width
, height
, writable
);
172 else if ( mlt_properties_get_data( properties
, "image", NULL
) != NULL
)
174 *format
= mlt_image_yuv422
;
175 *buffer
= mlt_properties_get_data( properties
, "image", NULL
);
176 *width
= mlt_properties_get_int( properties
, "width" );
177 *height
= mlt_properties_get_int( properties
, "height" );
181 if ( test_card
.vfmt
!= *format
)
186 test_card
.vfmt
= *format
;
187 test_card
.width
= *width
== 0 ?
720 : *width
;
188 test_card
.height
= *height
== 0 ?
576 : *height
;
194 case mlt_image_rgb24
:
195 test_card
.image
= realloc( test_card
.image
, test_card
.width
* test_card
.height
* 3 );
196 memset( test_card
.image
, 255, test_card
.width
* test_card
.height
* 3 );
198 case mlt_image_rgb24a
:
199 test_card
.image
= realloc( test_card
.image
, test_card
.width
* test_card
.height
* 4 );
200 memset( test_card
.image
, 255, test_card
.width
* test_card
.height
* 4 );
202 case mlt_image_yuv422
:
203 test_card
.image
= realloc( test_card
.image
, test_card
.width
* test_card
.height
* 2 );
205 q
= test_card
.image
+ test_card
.width
* test_card
.height
* 2;
212 case mlt_image_yuv420p
:
213 test_card
.image
= realloc( test_card
.image
, test_card
.width
* test_card
.height
* 3 / 2 );
214 memset( test_card
.image
, 255, test_card
.width
* test_card
.height
* 3 / 2 );
219 *width
= test_card
.width
;
220 *height
= test_card
.height
;
221 *buffer
= test_card
.image
;
227 uint8_t *mlt_frame_get_alpha_mask( mlt_frame
this )
229 if ( this->get_alpha_mask
!= NULL
)
230 return this->get_alpha_mask( this );
231 return test_card
.alpha
;
234 int mlt_frame_get_audio( mlt_frame
this, int16_t **buffer
, mlt_audio_format
*format
, int *frequency
, int *channels
, int *samples
)
236 if ( this->get_audio
!= NULL
)
238 return this->get_audio( this, buffer
, format
, frequency
, channels
, samples
);
242 if ( test_card
.afmt
!= *format
)
244 test_card
.afmt
= *format
;
245 test_card
.audio
= realloc( test_card
.audio
, 1920 * 2 * sizeof( int16_t ) );
246 memset( test_card
.audio
, 0, 1920 * 2 * sizeof( int16_t ) );
249 *buffer
= test_card
.audio
;
257 void mlt_frame_close( mlt_frame
this )
259 mlt_frame frame
= mlt_frame_pop_frame( this );
261 while ( frame
!= NULL
)
263 mlt_frame_close( frame
);
264 frame
= mlt_frame_pop_frame( this );
267 mlt_properties_close( &this->parent
);
272 /***** convenience functions *****/
273 #define RGB2YUV(r, g, b, y, u, v)\
274 y = (306*r + 601*g + 117*b) >> 10;\
275 u = ((-172*r - 340*g + 512*b) >> 10) + 128;\
276 v = ((512*r - 429*g - 83*b) >> 10) + 128;\
280 y = y > 255 ? 255 : y;\
281 u = u > 255 ? 255 : u;\
282 v = v > 255 ? 255 : v
284 int mlt_convert_rgb24a_to_yuv422( uint8_t *rgba
, int width
, int height
, int stride
, uint8_t *yuv
, uint8_t *alpha
)
287 register int y0
, y1
, u0
, u1
, v0
, v1
;
288 register int r
, g
, b
;
289 register uint8_t *d
= yuv
;
292 for ( i
= 0; i
< height
; i
++ )
294 register uint8_t *s
= rgba
+ ( stride
* i
);
295 for ( j
= 0; j
< ( width
/ 2 ); j
++ )
301 RGB2YUV (r
, g
, b
, y0
, u0
, v0
);
306 RGB2YUV (r
, g
, b
, y1
, u1
, v1
);
318 RGB2YUV (r
, g
, b
, y0
, u0
, v0
);
326 int mlt_convert_rgb24_to_yuv422( uint8_t *rgb
, int width
, int height
, int stride
, uint8_t *yuv
)
329 register int y0
, y1
, u0
, u1
, v0
, v1
;
330 register int r
, g
, b
;
331 register uint8_t *d
= yuv
;
334 for ( i
= 0; i
< height
; i
++ )
336 register uint8_t *s
= rgb
+ ( stride
* i
);
337 for ( j
= 0; j
< ( width
/ 2 ); j
++ )
342 RGB2YUV (r
, g
, b
, y0
, u0
, v0
);
346 RGB2YUV (r
, g
, b
, y1
, u1
, v1
);
357 RGB2YUV (r
, g
, b
, y0
, u0
, v0
);
365 int mlt_convert_yuv420p_to_yuv422( uint8_t *yuv420p
, int width
, int height
, int stride
, uint8_t *yuv
)
370 int half
= width
>> 1;
372 uint8_t *Y
= yuv420p
;
373 uint8_t *U
= Y
+ width
* height
;
374 uint8_t *V
= U
+ width
* height
/ 4;
376 register uint8_t *d
= yuv
;
378 for ( i
= 0; i
< height
; i
++ )
380 register uint8_t *u
= U
+ ( i
/ 2 ) * ( half
);
381 register uint8_t *v
= V
+ ( i
/ 2 ) * ( half
);
383 for ( j
= 0; j
< half
; j
++ )
394 int mlt_frame_composite_yuv( mlt_frame
this, mlt_frame that
, int x
, int y
, float weight
)
397 int width_src
, height_src
;
398 int width_dest
, height_dest
;
399 mlt_image_format format_src
, format_dest
;
400 uint8_t *p_src
, *p_dest
;
404 int x_src
= 0, y_src
= 0;
406 // optimization point - no work to do
407 if ( ( x
< 0 && -x
>= width_src
) || ( y
< 0 && -y
>= height_src
) )
410 format_src
= mlt_image_yuv422
;
411 format_dest
= mlt_image_yuv422
;
413 mlt_frame_get_image( this, &p_dest
, &format_dest
, &width_dest
, &height_dest
, 1 /* writable */ );
414 mlt_frame_get_image( that
, &p_src
, &format_src
, &width_src
, &height_src
, 0 /* writable */ );
416 stride_src
= width_src
* 2;
417 stride_dest
= width_dest
* 2;
419 // crop overlay off the left edge of frame
427 // crop overlay beyond right edge of frame
428 else if ( x
+ width_src
> width_dest
)
429 width_src
= width_dest
- x
;
431 // crop overlay off the top edge of the frame
437 // crop overlay below bottom edge of frame
438 else if ( y
+ height_src
> height_dest
)
439 height_src
= height_dest
- y
;
441 // offset pointer into overlay buffer based on cropping
442 p_src
+= x_src
* 2 + y_src
* stride_src
;
444 // offset pointer into frame buffer based upon positive, even coordinates only!
445 // if ( interlaced && y % 2 )
447 p_dest
+= ( x
< 0 ?
0 : x
) * 2 + ( y
< 0 ?
0 : y
) * stride_dest
;
449 // Get the alpha channel of the overlay
450 uint8_t *p_alpha
= mlt_frame_get_alpha_mask( that
);
452 // offset pointer into alpha channel based upon cropping
454 p_alpha
+= x_src
+ y_src
* stride_src
/ 2;
456 // now do the compositing only to cropped extents
457 for ( i
= 0; i
< height_src
; i
++ )
462 uint8_t *z
= p_alpha
;
464 for ( j
= 0; j
< width_src
; j
++ )
468 uint8_t a
= ( z
== NULL
) ?
255 : *z
++;
469 float value
= ( weight
* ( float ) a
/ 255.0 );
470 *o
++ = (uint8_t)( y
* value
+ *q
++ * ( 1 - value
) );
471 *o
++ = (uint8_t)( uv
* value
+ *q
++ * ( 1 - value
) );
475 p_dest
+= stride_dest
;
477 p_alpha
+= stride_src
/ 2;
483 void *memfill( void *dst
, void *src
, int l
, int elements
)
486 for ( i
= 0; i
< elements
; i
++ )
487 dst
= memcpy( dst
, src
, l
) + l
;
491 void mlt_resize_yuv422( uint8_t *output
, int owidth
, int oheight
, uint8_t *input
, int iwidth
, int iheight
)
494 int istride
= iwidth
* 2;
495 int ostride
= owidth
* 2;
497 iwidth
= iwidth
- ( iwidth
% 4 );
498 owidth
= owidth
- ( owidth
% 4 );
499 iheight
= iheight
- ( iheight
% 2 );
500 oheight
= oheight
- ( oheight
% 2 );
502 // Coordinates (0,0 is middle of output)
506 int out_x_range
= owidth
/ 2;
507 int out_y_range
= oheight
/ 2;
508 int in_x_range
= iwidth
/ 2 < out_x_range ? iwidth
/ 2 : out_x_range
;
509 int in_y_range
= iheight
/ 2 < out_y_range ? iheight
/ 2 : out_y_range
;
512 uint8_t *out_line
= output
;
513 uint8_t *out_ptr
= out_line
;
515 // Calculate a middle and possibly invalid pointer in the input
516 uint8_t *in_middle
= input
+ istride
* ( iheight
/ 2 ) + ( iwidth
/ 2 ) * 2;
517 int in_line
= - in_y_range
* istride
- in_x_range
* 2;
519 uint8_t black
[ 2 ] = { 16, 128 };
521 // Loop for the entirety of our output height.
522 for ( y
= - out_y_range
; y
< out_y_range
; y
++ )
524 // Start at the beginning of the line
527 if ( abs( y
) < iheight
/ 2 )
529 // Fill the outer part with black
530 out_ptr
= memfill( out_ptr
, black
, 2, out_x_range
- in_x_range
);
532 // We're in the input range for this row.
533 memcpy( out_ptr
, in_middle
+ in_line
, 2 * iwidth
);
534 out_ptr
+= 2 * iwidth
;
536 // Fill the outer part with black
537 out_ptr
= memfill( out_ptr
, black
, 2, out_x_range
- in_x_range
);
539 // Move to next input line
544 // Fill whole line with black
545 out_ptr
= memfill( out_ptr
, black
, 2, owidth
);
548 // Move to next output line
553 /** A resizing function for yuv422 frames - this does not rescale, but simply
554 resizes. It assumes yuv422 images available on the frame so use with care.
557 uint8_t *mlt_frame_resize_yuv422( mlt_frame
this, int owidth
, int oheight
)
560 mlt_properties properties
= mlt_frame_properties( this );
562 // Get the input image, width and height
563 uint8_t *input
= mlt_properties_get_data( properties
, "image", NULL
);
564 int iwidth
= mlt_properties_get_int( properties
, "width" );
565 int iheight
= mlt_properties_get_int( properties
, "height" );
567 // If width and height are correct, don't do anything
568 if ( iwidth
!= owidth
|| iheight
!= oheight
)
570 // Create the output image
571 uint8_t *output
= malloc( owidth
* oheight
* 2 );
573 // Call the generic resize
574 mlt_resize_yuv422( output
, owidth
, oheight
, input
, iwidth
, iheight
);
576 // Now update the frame
577 mlt_properties_set_data( properties
, "image", output
, owidth
* oheight
* 2, free
, NULL
);
578 mlt_properties_set_int( properties
, "width", owidth
);
579 mlt_properties_set_int( properties
, "height", oheight
);
585 // No change, return input
589 /** A rescaling function for yuv422 frames - low quality, and provided for testing
590 only. It assumes yuv422 images available on the frame so use with care.
593 uint8_t *mlt_frame_rescale_yuv422( mlt_frame
this, int owidth
, int oheight
)
596 mlt_properties properties
= mlt_frame_properties( this );
598 // Get the input image, width and height
599 uint8_t *input
= mlt_properties_get_data( properties
, "image", NULL
);
600 int iwidth
= mlt_properties_get_int( properties
, "width" );
601 int iheight
= mlt_properties_get_int( properties
, "height" );
603 // If width and height are correct, don't do anything
604 if ( iwidth
!= owidth
|| iheight
!= oheight
)
606 // Create the output image
607 uint8_t *output
= malloc( owidth
* oheight
* 2 );
610 int istride
= iwidth
* 2;
611 int ostride
= owidth
* 2;
613 iwidth
= iwidth
- ( iwidth
% 4 );
615 // Coordinates (0,0 is middle of output)
618 // Derived coordinates
622 int out_x_range
= owidth
/ 2;
623 int out_y_range
= oheight
/ 2;
624 int in_x_range
= iwidth
/ 2;
625 int in_y_range
= iheight
/ 2;
628 uint8_t *out_line
= output
;
631 // Calculate a middle pointer
632 uint8_t *in_middle
= input
+ istride
* in_y_range
+ in_x_range
* 2;
636 // Generate the affine transform scaling values
637 float scale_width
= ( float )iwidth
/ ( float )owidth
;
638 float scale_height
= ( float )iheight
/ ( float )oheight
;
640 // Loop for the entirety of our output height.
641 for ( y
= - out_y_range
; y
< out_y_range
; y
++ )
643 // Calculate the derived y value
644 dy
= scale_height
* y
;
646 // Start at the beginning of the line
649 // Pointer to the middle of the input line
650 in_line
= in_middle
+ dy
* istride
;
652 // Loop for the entirety of our output row.
653 for ( x
= - out_x_range
; x
< out_x_range
; x
+= 1 )
655 // Calculated the derived x
656 dx
= scale_width
* x
;
658 // Check if x and y are in the valid input range.
659 if ( abs( dx
) < in_x_range
&& abs( dy
) < in_y_range
)
661 // We're in the input range for this row.
662 in_ptr
= in_line
+ ( dx
>> 1 ) * 4 + 2 * ( x
& 1 );
663 *out_ptr
++ = *in_ptr
++;
664 *out_ptr
++ = *in_ptr
++;
668 // We're not in the input range for this row.
674 // Move to next output line
678 // Now update the frame
679 mlt_properties_set_data( properties
, "image", output
, owidth
* oheight
* 2, free
, NULL
);
680 mlt_properties_set_int( properties
, "width", owidth
);
681 mlt_properties_set_int( properties
, "height", oheight
);
687 // No change, return input
691 int mlt_frame_mix_audio( mlt_frame
this, mlt_frame that
, float weight
, int16_t **buffer
, mlt_audio_format
*format
, int *frequency
, int *channels
, int *samples
)
694 int16_t *p_src
, *p_dest
;
695 int frequency_src
, frequency_dest
;
696 int channels_src
, channels_dest
;
697 int samples_src
, samples_dest
;
700 mlt_frame_get_audio( this, &p_dest
, format
, &frequency_dest
, &channels_dest
, &samples_dest
);
701 mlt_frame_get_audio( that
, &p_src
, format
, &frequency_src
, &channels_src
, &samples_src
);
703 *samples
= samples_src
< samples_dest ? samples_src
: samples_dest
;
704 *channels
= channels_src
< channels_dest ? channels_src
: channels_dest
;
707 for ( i
= 0; i
< *samples
; i
++ )
709 for ( j
= 0; j
< *channels
; j
++ )
711 double dest
= (double) p_dest
[ i
* channels_dest
+ j
];
712 double src
= (double) p_src
[ i
* channels_src
+ j
];
713 p_dest
[ i
* channels_dest
+ j
] = src
* weight
+ dest
* ( 1.0 - weight
);
720 int mlt_sample_calculator( float fps
, int frequency
, int64_t position
)
724 if ( fps
> 29 && fps
<= 30 )
726 samples
= frequency
/ 30;
731 if ( position
% 5 != 0 )
735 if ( position
% 300 == 0 )
737 else if ( position
% 30 == 0 )
739 else if ( position
% 2 == 0 )
745 if ( position
% 30 == 0 )
747 else if ( position
% 29 == 0 )
749 else if ( position
% 4 == 2 )
760 samples
= frequency
/ fps
;