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"
23 #include "mlt_producer.h"
24 #include "mlt_factory.h"
29 /** Constructor for a frame.
32 mlt_frame mlt_frame_init( )
35 mlt_frame this = calloc( sizeof( struct mlt_frame_s ), 1 );
39 // Get the normalisation
40 char *normalisation = mlt_environment( "MLT_NORMALISATION" );
42 // Initialise the properties
43 mlt_properties properties = &this->parent;
44 mlt_properties_init( properties, this );
46 // Set default properties on the frame
47 mlt_properties_set_position( properties, "_position", 0.0 );
48 mlt_properties_set_data( properties, "image", NULL, 0, NULL, NULL );
50 if ( normalisation == NULL || strcmp( normalisation, "NTSC" ) )
52 mlt_properties_set_int( properties, "width", 720 );
53 mlt_properties_set_int( properties, "height", 576 );
54 mlt_properties_set_int( properties, "normalised_width", 720 );
55 mlt_properties_set_int( properties, "normalised_height", 576 );
59 mlt_properties_set_int( properties, "width", 720 );
60 mlt_properties_set_int( properties, "height", 480 );
61 mlt_properties_set_int( properties, "normalised_width", 720 );
62 mlt_properties_set_int( properties, "normalised_height", 480 );
65 mlt_properties_set_double( properties, "aspect_ratio", 4.0 / 3.0 );
66 mlt_properties_set_data( properties, "audio", NULL, 0, NULL, NULL );
67 mlt_properties_set_data( properties, "alpha", NULL, 0, NULL, NULL );
69 // Construct stacks for frames and methods
70 this->stack_get_image = mlt_deque_init( );
71 this->stack_frame = mlt_deque_init( );
72 this->stack_service = mlt_deque_init( );
78 /** Fetch the frames properties.
81 mlt_properties mlt_frame_properties( mlt_frame this )
86 /** Check if we have a way to derive something other than a test card.
89 int mlt_frame_is_test_card( mlt_frame this )
91 return mlt_properties_get_int( mlt_frame_properties( this ), "test_image" );
94 /** Check if we have a way to derive something than test audio.
97 int mlt_frame_is_test_audio( mlt_frame this )
99 return this->get_audio == NULL || mlt_properties_get_int( mlt_frame_properties( this ), "test_audio" );
102 /** Get the aspect ratio of the frame.
105 double mlt_frame_get_aspect_ratio( mlt_frame this )
107 return mlt_properties_get_double( mlt_frame_properties( this ), "aspect_ratio" );
110 /** Set the aspect ratio of the frame.
113 int mlt_frame_set_aspect_ratio( mlt_frame this, double value )
115 return mlt_properties_set_double( mlt_frame_properties( this ), "aspect_ratio", value );
118 /** Get the position of this frame.
121 mlt_position mlt_frame_get_position( mlt_frame this )
123 return mlt_properties_get_position( mlt_frame_properties( this ), "_position" );
126 /** Set the position of this frame.
129 int mlt_frame_set_position( mlt_frame this, mlt_position value )
131 return mlt_properties_set_position( mlt_frame_properties( this ), "_position", value );
134 /** Stack a get_image callback.
137 int mlt_frame_push_get_image( mlt_frame this, mlt_get_image get_image )
139 return mlt_deque_push_back( this->stack_get_image, get_image );
142 /** Pop a get_image callback.
145 mlt_get_image mlt_frame_pop_get_image( mlt_frame this )
147 return mlt_deque_pop_back( this->stack_get_image );
153 int mlt_frame_push_frame( mlt_frame this, mlt_frame that )
155 return mlt_deque_push_back( this->stack_frame, that );
161 mlt_frame mlt_frame_pop_frame( mlt_frame this )
163 return mlt_deque_pop_back( this->stack_frame );
169 int mlt_frame_push_service( mlt_frame this, void *that )
171 return mlt_deque_push_back( this->stack_service, that );
177 void *mlt_frame_pop_service( mlt_frame this )
179 return mlt_deque_pop_back( this->stack_service );
182 int mlt_frame_get_image( mlt_frame this, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
184 mlt_properties properties = mlt_frame_properties( this );
185 mlt_get_image get_image = mlt_frame_pop_get_image( this );
186 mlt_producer producer = mlt_properties_get_data( properties, "test_card_producer", NULL );
188 if ( get_image != NULL )
190 return get_image( this, buffer, format, width, height, writable );
192 else if ( mlt_properties_get_data( properties, "image", NULL ) != NULL )
194 *format = mlt_image_yuv422;
195 *buffer = mlt_properties_get_data( properties, "image", NULL );
196 *width = mlt_properties_get_int( properties, "width" );
197 *height = mlt_properties_get_int( properties, "height" );
199 else if ( producer != NULL )
201 mlt_frame test_frame = NULL;
202 mlt_service_get_frame( mlt_producer_service( producer ), &test_frame, 0 );
203 if ( test_frame != NULL )
205 mlt_properties test_properties = mlt_frame_properties( test_frame );
206 mlt_properties_set_double( test_properties, "consumer_aspect_ratio", mlt_properties_get_double( properties, "consumer_aspect_ratio" ) );
207 mlt_properties_set_double( test_properties, "consumer_scale", mlt_properties_get_double( properties, "consumer_scale" ) );
208 mlt_properties_set( test_properties, "rescale.interp", "nearest" );
209 mlt_frame_get_image( test_frame, buffer, format, width, height, writable );
210 mlt_properties_set_data( properties, "test_card_frame", test_frame, 0, ( mlt_destructor )mlt_frame_close, NULL );
211 mlt_properties_set_data( properties, "image", *buffer, *width * *height * 2, NULL, NULL );
212 mlt_properties_set_int( properties, "width", *width );
213 mlt_properties_set_int( properties, "height", *height );
217 mlt_properties_set_data( properties, "test_card_producer", NULL, 0, NULL, NULL );
218 mlt_frame_get_image( this, buffer, format, width, height, writable );
227 *width = *width == 0 ? 720 : *width;
228 *height = *height == 0 ? 576 : *height;
229 size = *width * *height;
231 mlt_properties_set_int( properties, "width", *width );
232 mlt_properties_set_int( properties, "height", *height );
240 case mlt_image_rgb24:
243 *buffer = mlt_pool_alloc( size );
245 memset( *buffer, 255, size );
247 case mlt_image_rgb24a:
250 *buffer = mlt_pool_alloc( size );
252 memset( *buffer, 255, size );
254 case mlt_image_yuv422:
257 *buffer = mlt_pool_alloc( size );
260 while ( p != NULL && p != q )
266 case mlt_image_yuv420p:
268 *buffer = mlt_pool_alloc( size );
270 memset( *buffer, 255, size );
274 mlt_properties_set_data( properties, "image", *buffer, size, ( mlt_destructor )mlt_pool_release, NULL );
275 mlt_properties_set_int( properties, "test_image", 1 );
281 uint8_t *mlt_frame_get_alpha_mask( mlt_frame this )
283 if ( this->get_alpha_mask != NULL )
284 return this->get_alpha_mask( this );
288 int mlt_frame_get_audio( mlt_frame this, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
290 mlt_properties properties = mlt_frame_properties( this );
292 if ( this->get_audio != NULL )
294 return this->get_audio( this, buffer, format, frequency, channels, samples );
299 *samples = *samples <= 0 ? 1920 : *samples;
300 *channels = *channels <= 0 ? 2 : *channels;
301 *frequency = *frequency <= 0 ? 48000 : *frequency;
302 size = *samples * *channels * sizeof( int16_t );
303 *buffer = mlt_pool_alloc( size );
304 if ( *buffer != NULL )
305 memset( *buffer, 0, size );
306 mlt_properties_set_data( properties, "audio", *buffer, size, ( mlt_destructor )mlt_pool_release, NULL );
307 mlt_properties_set_int( properties, "test_audio", 1 );
312 void mlt_frame_close( mlt_frame this )
316 mlt_deque_close( this->stack_get_image );
317 mlt_deque_close( this->stack_frame );
318 mlt_deque_close( this->stack_service );
319 mlt_properties_close( &this->parent );
324 /***** convenience functions *****/
325 #define RGB2YUV(r, g, b, y, u, v)\
326 y = (306*r + 601*g + 117*b) >> 10;\
327 u = ((-172*r - 340*g + 512*b) >> 10) + 128;\
328 v = ((512*r - 429*g - 83*b) >> 10) + 128;\
329 y = y < 16 ? 16 : y;\
330 u = u < 16 ? 16 : u;\
331 v = v < 16 ? 16 : v;\
332 y = y > 235 ? 235 : y;\
333 u = u > 240 ? 240 : u;\
334 v = v > 240 ? 240 : v
336 int mlt_convert_rgb24a_to_yuv422( uint8_t *rgba, int width, int height, int stride, uint8_t *yuv, uint8_t *alpha )
339 register int y0, y1, u0, u1, v0, v1;
340 register int r, g, b;
341 register uint8_t *d = yuv;
344 for ( i = 0; i < height; i++ )
346 register uint8_t *s = rgba + ( stride * i );
347 for ( j = 0; j < ( width / 2 ); j++ )
353 RGB2YUV (r, g, b, y0, u0 , v0);
358 RGB2YUV (r, g, b, y1, u1 , v1);
370 RGB2YUV (r, g, b, y0, u0 , v0);
378 int mlt_convert_rgb24_to_yuv422( uint8_t *rgb, int width, int height, int stride, uint8_t *yuv )
381 register int y0, y1, u0, u1, v0, v1;
382 register int r, g, b;
383 register uint8_t *d = yuv;
386 for ( i = 0; i < height; i++ )
388 register uint8_t *s = rgb + ( stride * i );
389 for ( j = 0; j < ( width / 2 ); j++ )
394 RGB2YUV (r, g, b, y0, u0 , v0);
398 RGB2YUV (r, g, b, y1, u1 , v1);
409 RGB2YUV (r, g, b, y0, u0 , v0);
417 int mlt_convert_yuv420p_to_yuv422( uint8_t *yuv420p, int width, int height, int stride, uint8_t *yuv )
422 int half = width >> 1;
424 uint8_t *Y = yuv420p;
425 uint8_t *U = Y + width * height;
426 uint8_t *V = U + width * height / 4;
428 register uint8_t *d = yuv;
430 for ( i = 0; i < height; i++ )
432 register uint8_t *u = U + ( i / 2 ) * ( half );
433 register uint8_t *v = V + ( i / 2 ) * ( half );
435 for ( j = 0; j < half; j++ )
446 void mlt_resize_yuv422( uint8_t *output, int owidth, int oheight, uint8_t *input, int iwidth, int iheight )
449 int istride = iwidth * 2;
450 int ostride = owidth * 2;
452 iwidth = iwidth - ( iwidth % 4 );
453 owidth = owidth - ( owidth % 4 );
454 iheight = iheight - ( iheight % 2 );
455 oheight = oheight - ( oheight % 2 );
457 // Optimisation point
458 if ( iwidth == owidth && iheight == oheight )
459 memcpy( output, input, iheight * istride );
461 // Coordinates (0,0 is middle of output)
465 int out_x_range = owidth / 2;
466 int out_y_range = oheight / 2;
467 int in_x_range = iwidth / 2 < out_x_range ? iwidth / 2 : out_x_range;
468 int in_y_range = iheight / 2 < out_y_range ? iheight / 2 : out_y_range;
471 uint8_t *out_line = output;
472 uint8_t *out_ptr = out_line;
474 // Calculate a middle and possibly invalid pointer in the input
475 uint8_t *in_middle = input + istride * ( iheight / 2 ) + ( iwidth / 2 ) * 2;
476 int in_line = - in_y_range * istride - in_x_range * 2;
480 // Fill whole section with black
481 y = out_y_range - ( iheight / 2 );
482 int blank_elements = ostride * y / 2;
483 elements = blank_elements;
484 while ( elements -- )
490 int active_width = 2 * iwidth;
491 int inactive_width = out_x_range - in_x_range;
493 // Loop for the entirety of our output height.
496 // Start at the beginning of the line
499 // Fill the outer part with black
500 elements = inactive_width;
501 while ( elements -- )
507 // We're in the input range for this row.
508 memcpy( out_ptr, in_middle + in_line, active_width );
509 out_ptr += active_width;
511 // Fill the outer part with black
512 elements = inactive_width;
513 while ( elements -- )
519 // Move to next input line
522 // Move to next output line
526 // Fill whole section with black
527 elements = blank_elements;
528 while ( elements -- )
535 /** A resizing function for yuv422 frames - this does not rescale, but simply
536 resizes. It assumes yuv422 images available on the frame so use with care.
539 uint8_t *mlt_frame_resize_yuv422( mlt_frame this, int owidth, int oheight )
542 mlt_properties properties = mlt_frame_properties( this );
544 // Get the input image, width and height
545 uint8_t *input = mlt_properties_get_data( properties, "image", NULL );
546 int iwidth = mlt_properties_get_int( properties, "width" );
547 int iheight = mlt_properties_get_int( properties, "height" );
549 // If width and height are correct, don't do anything
550 if ( iwidth != owidth || iheight != oheight )
552 // Create the output image
553 uint8_t *output = mlt_pool_alloc( owidth * ( oheight + 1 ) * 2 );
555 // Call the generic resize
556 mlt_resize_yuv422( output, owidth, oheight, input, iwidth, iheight );
558 // Now update the frame
559 mlt_properties_set_data( properties, "image", output, owidth * ( oheight + 1 ) * 2, ( mlt_destructor )mlt_pool_release, NULL );
560 mlt_properties_set_int( properties, "width", owidth );
561 mlt_properties_set_int( properties, "height", oheight );
566 // No change, return input
570 /** A rescaling function for yuv422 frames - low quality, and provided for testing
571 only. It assumes yuv422 images available on the frame so use with care.
574 uint8_t *mlt_frame_rescale_yuv422( mlt_frame this, int owidth, int oheight )
577 mlt_properties properties = mlt_frame_properties( this );
579 // Get the input image, width and height
580 uint8_t *input = mlt_properties_get_data( properties, "image", NULL );
581 int iwidth = mlt_properties_get_int( properties, "width" );
582 int iheight = mlt_properties_get_int( properties, "height" );
584 // If width and height are correct, don't do anything
585 if ( iwidth != owidth || iheight != oheight )
587 // Create the output image
588 uint8_t *output = mlt_pool_alloc( owidth * ( oheight + 1 ) * 2 );
591 int istride = iwidth * 2;
592 int ostride = owidth * 2;
594 iwidth = iwidth - ( iwidth % 4 );
596 // Derived coordinates
600 int out_x_range = owidth / 2;
601 int out_y_range = oheight / 2;
602 int in_x_range = iwidth / 2;
603 int in_y_range = iheight / 2;
606 register uint8_t *out_line = output;
607 register uint8_t *out_ptr;
609 // Calculate a middle pointer
610 uint8_t *in_middle = input + istride * in_y_range + in_x_range * 2;
613 // Generate the affine transform scaling values
614 register int scale_width = ( iwidth << 16 ) / owidth;
615 register int scale_height = ( iheight << 16 ) / oheight;
616 register int base = 0;
618 int outer = out_x_range * scale_width;
619 int bottom = out_y_range * scale_height;
621 // Loop for the entirety of our output height.
622 for ( dy = - bottom; dy < bottom; dy += scale_height )
624 // Start at the beginning of the line
627 // Pointer to the middle of the input line
628 in_line = in_middle + ( dy >> 16 ) * istride;
630 // Loop for the entirety of our output row.
631 for ( dx = - outer; dx < outer; dx += scale_width )
635 *out_ptr ++ = *( in_line + base );
637 *out_ptr ++ = *( in_line + base + 1 );
641 *out_ptr ++ = *( in_line + base );
643 *out_ptr ++ = *( in_line + base + 3 );
646 // Move to next output line
650 // Now update the frame
651 mlt_properties_set_data( properties, "image", output, owidth * ( oheight + 1 ) * 2, ( mlt_destructor )mlt_pool_release, NULL );
652 mlt_properties_set_int( properties, "width", owidth );
653 mlt_properties_set_int( properties, "height", oheight );
659 // No change, return input
663 int mlt_frame_mix_audio( mlt_frame this, mlt_frame that, float weight_start, float weight_end, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
667 int frequency_src = *frequency, frequency_dest = *frequency;
668 int channels_src = *channels, channels_dest = *channels;
669 int samples_src = *samples, samples_dest = *samples;
673 mlt_frame_get_audio( this, &dest, format, &frequency_dest, &channels_dest, &samples_dest );
674 //fprintf( stderr, "mix: frame dest samples %d channels %d position %lld\n", samples_dest, channels_dest, mlt_properties_get_position( mlt_frame_properties( this ), "_position" ) );
675 mlt_frame_get_audio( that, &src, format, &frequency_src, &channels_src, &samples_src );
676 //fprintf( stderr, "mix: frame src samples %d channels %d\n", samples_src, channels_src );
678 if ( channels_src > 6 )
680 if ( channels_dest > 6 )
682 if ( samples_src > 4000 )
684 if ( samples_dest > 4000 )
687 // determine number of samples to process
688 *samples = samples_src < samples_dest ? samples_src : samples_dest;
689 *channels = channels_src < channels_dest ? channels_src : channels_dest;
691 *frequency = frequency_dest;
693 // Compute a smooth ramp over start to end
694 float weight = weight_start;
695 float weight_step = ( weight_end - weight_start ) / *samples;
698 for ( i = 0; i < *samples; i++ )
700 for ( j = 0; j < *channels; j++ )
702 if ( j < channels_dest )
703 d = (double) dest[ i * channels_dest + j ];
704 if ( j < channels_src )
705 s = (double) src[ i * channels_src + j ];
706 dest[ i * channels_dest + j ] = s * weight + d * ( 1.0 - weight );
708 weight += weight_step;
714 int mlt_sample_calculator( float fps, int frequency, int64_t position )
718 if ( fps > 29 && fps <= 30 )
720 samples = frequency / 30;
725 if ( position % 5 != 0 )
729 if ( position % 300 == 0 )
731 else if ( position % 30 == 0 )
733 else if ( position % 2 == 0 )
739 if ( position % 30 == 0 )
741 else if ( position % 29 == 0 )
743 else if ( position % 4 == 2 )
754 samples = frequency / fps;