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 );
56 mlt_properties_set_double( properties, "aspect_ratio", 59.0/54.0 );
60 mlt_properties_set_int( properties, "width", 720 );
61 mlt_properties_set_int( properties, "height", 480 );
62 mlt_properties_set_int( properties, "normalised_width", 720 );
63 mlt_properties_set_int( properties, "normalised_height", 480 );
64 mlt_properties_set_double( properties, "aspect_ratio", 10.0/11.0 );
67 mlt_properties_set_data( properties, "audio", NULL, 0, NULL, NULL );
68 mlt_properties_set_data( properties, "alpha", NULL, 0, NULL, NULL );
70 // Construct stacks for frames and methods
71 this->stack_image = mlt_deque_init( );
72 this->stack_audio = mlt_deque_init( );
73 this->stack_service = mlt_deque_init( );
79 /** Fetch the frames properties.
82 mlt_properties mlt_frame_properties( mlt_frame this )
84 return this != NULL ? &this->parent : NULL;
87 /** Check if we have a way to derive something other than a test card.
90 int mlt_frame_is_test_card( mlt_frame this )
92 return mlt_deque_count( this->stack_image ) == 0 || mlt_properties_get_int( MLT_FRAME_PROPERTIES( this ), "test_image" );
95 /** Check if we have a way to derive something other than test audio.
98 int mlt_frame_is_test_audio( mlt_frame this )
100 return mlt_deque_count( this->stack_audio ) == 0 || mlt_properties_get_int( MLT_FRAME_PROPERTIES( this ), "test_audio" );
103 /** Get the aspect ratio of the frame.
106 double mlt_frame_get_aspect_ratio( mlt_frame this )
108 return mlt_properties_get_double( MLT_FRAME_PROPERTIES( this ), "aspect_ratio" );
111 /** Set the aspect ratio of the frame.
114 int mlt_frame_set_aspect_ratio( mlt_frame this, double value )
116 return mlt_properties_set_double( MLT_FRAME_PROPERTIES( this ), "aspect_ratio", value );
119 /** Get the position of this frame.
122 mlt_position mlt_frame_get_position( mlt_frame this )
124 int pos = mlt_properties_get_position( MLT_FRAME_PROPERTIES( this ), "_position" );
125 return pos < 0 ? 0 : pos;
128 /** Set the position of this frame.
131 int mlt_frame_set_position( mlt_frame this, mlt_position value )
133 return mlt_properties_set_position( MLT_FRAME_PROPERTIES( this ), "_position", value );
136 /** Stack a get_image callback.
139 int mlt_frame_push_get_image( mlt_frame this, mlt_get_image get_image )
141 return mlt_deque_push_back( this->stack_image, get_image );
144 /** Pop a get_image callback.
147 mlt_get_image mlt_frame_pop_get_image( mlt_frame this )
149 return mlt_deque_pop_back( this->stack_image );
155 int mlt_frame_push_frame( mlt_frame this, mlt_frame that )
157 return mlt_deque_push_back( this->stack_image, that );
163 mlt_frame mlt_frame_pop_frame( mlt_frame this )
165 return mlt_deque_pop_back( this->stack_image );
171 int mlt_frame_push_service( mlt_frame this, void *that )
173 return mlt_deque_push_back( this->stack_image, that );
179 void *mlt_frame_pop_service( mlt_frame this )
181 return mlt_deque_pop_back( this->stack_image );
187 int mlt_frame_push_service_int( mlt_frame this, int that )
189 return mlt_deque_push_back_int( this->stack_image, that );
195 int mlt_frame_pop_service_int( mlt_frame this )
197 return mlt_deque_pop_back_int( this->stack_image );
200 /** Push an audio item on the stack.
203 int mlt_frame_push_audio( mlt_frame this, void *that )
205 return mlt_deque_push_back( this->stack_audio, that );
208 /** Pop an audio item from the stack
211 void *mlt_frame_pop_audio( mlt_frame this )
213 return mlt_deque_pop_back( this->stack_audio );
216 /** Return the service stack
219 mlt_deque mlt_frame_service_stack( mlt_frame this )
221 return this->stack_service;
224 /** Replace image stack with the information provided.
226 This might prove to be unreliable and restrictive - the idea is that a transition
227 which normally uses two images may decide to only use the b frame (ie: in the case
228 of a composite where the b frame completely obscures the a frame).
230 The image must be writable and the destructor for the image itself must be taken
231 care of on another frame and that frame cannot have a replace applied to it...
232 Further it assumes that no alpha mask is in use.
234 For these reasons, it can only be used in a specific situation - when you have
235 multiple tracks each with their own transition and these transitions are applied
236 in a strictly reversed order (ie: highest numbered [lowest track] is processed
239 More reliable approach - the cases should be detected during the process phase
240 and the upper tracks should simply not be invited to stack...
243 void mlt_frame_replace_image( mlt_frame this, uint8_t *image, mlt_image_format format, int width, int height )
245 // Remove all items from the stack
246 while( mlt_deque_pop_back( this->stack_image ) ) ;
248 // Update the information
249 mlt_properties_set_data( MLT_FRAME_PROPERTIES( this ), "image", image, 0, NULL, NULL );
250 mlt_properties_set_int( MLT_FRAME_PROPERTIES( this ), "width", width );
251 mlt_properties_set_int( MLT_FRAME_PROPERTIES( this ), "height", height );
252 mlt_properties_set_int( MLT_FRAME_PROPERTIES( this ), "format", format );
253 this->get_alpha_mask = NULL;
256 /** Get the image associated to the frame.
259 int mlt_frame_get_image( mlt_frame this, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
261 mlt_properties properties = MLT_FRAME_PROPERTIES( this );
262 mlt_get_image get_image = mlt_frame_pop_get_image( this );
263 mlt_producer producer = mlt_properties_get_data( properties, "test_card_producer", NULL );
266 *width = *width >> 1 << 1;
268 if ( get_image != NULL )
270 mlt_properties_set_int( properties, "image_count", mlt_properties_get_int( properties, "image_count" ) - 1 );
271 mlt_position position = mlt_frame_get_position( this );
272 error = get_image( this, buffer, format, width, height, writable );
273 mlt_properties_set_int( properties, "width", *width );
274 mlt_properties_set_int( properties, "height", *height );
275 mlt_properties_set_int( properties, "format", *format );
276 mlt_frame_set_position( this, position );
278 else if ( mlt_properties_get_data( properties, "image", NULL ) != NULL )
280 *format = mlt_properties_get_int( properties, "format" );
281 *buffer = mlt_properties_get_data( properties, "image", NULL );
282 *width = mlt_properties_get_int( properties, "width" );
283 *height = mlt_properties_get_int( properties, "height" );
285 else if ( producer != NULL )
287 mlt_frame test_frame = NULL;
288 mlt_service_get_frame( MLT_PRODUCER_SERVICE( producer ), &test_frame, 0 );
289 if ( test_frame != NULL )
291 mlt_properties test_properties = MLT_FRAME_PROPERTIES( test_frame );
292 mlt_properties_set_double( test_properties, "consumer_aspect_ratio", mlt_properties_get_double( properties, "consumer_aspect_ratio" ) );
293 mlt_properties_set( test_properties, "rescale.interp", mlt_properties_get( properties, "rescale.interp" ) );
294 mlt_frame_get_image( test_frame, buffer, format, width, height, writable );
295 mlt_properties_set_data( properties, "test_card_frame", test_frame, 0, ( mlt_destructor )mlt_frame_close, NULL );
296 mlt_properties_set_data( properties, "image", *buffer, *width * *height * 2, NULL, NULL );
297 mlt_properties_set_int( properties, "width", *width );
298 mlt_properties_set_int( properties, "height", *height );
299 mlt_properties_set_int( properties, "format", *format );
300 mlt_properties_set_double( properties, "aspect_ratio", mlt_frame_get_aspect_ratio( test_frame ) );
304 mlt_properties_set_data( properties, "test_card_producer", NULL, 0, NULL, NULL );
305 mlt_frame_get_image( this, buffer, format, width, height, writable );
314 *width = *width == 0 ? 720 : *width;
315 *height = *height == 0 ? 576 : *height;
316 size = *width * *height;
318 mlt_properties_set_int( properties, "format", *format );
319 mlt_properties_set_int( properties, "width", *width );
320 mlt_properties_set_int( properties, "height", *height );
321 mlt_properties_set_int( properties, "aspect_ratio", 0 );
329 case mlt_image_rgb24:
332 *buffer = mlt_pool_alloc( size );
334 memset( *buffer, 255, size );
336 case mlt_image_rgb24a:
337 case mlt_image_opengl:
340 *buffer = mlt_pool_alloc( size );
342 memset( *buffer, 255, size );
344 case mlt_image_yuv422:
347 *buffer = mlt_pool_alloc( size );
350 while ( p != NULL && p != q )
356 case mlt_image_yuv420p:
358 *buffer = mlt_pool_alloc( size );
360 memset( *buffer, 255, size );
364 mlt_properties_set_data( properties, "image", *buffer, size, ( mlt_destructor )mlt_pool_release, NULL );
365 mlt_properties_set_int( properties, "test_image", 1 );
368 mlt_properties_set_int( properties, "scaled_width", *width );
369 mlt_properties_set_int( properties, "scaled_height", *height );
374 uint8_t *mlt_frame_get_alpha_mask( mlt_frame this )
376 uint8_t *alpha = NULL;
379 if ( this->get_alpha_mask != NULL )
380 alpha = this->get_alpha_mask( this );
382 alpha = mlt_properties_get_data( &this->parent, "alpha", NULL );
385 int size = mlt_properties_get_int( &this->parent, "scaled_width" ) * mlt_properties_get_int( &this->parent, "scaled_height" );
386 alpha = mlt_pool_alloc( size );
387 memset( alpha, 255, size );
388 mlt_properties_set_data( &this->parent, "alpha", alpha, size, mlt_pool_release, NULL );
394 int mlt_frame_get_audio( mlt_frame this, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
396 mlt_get_audio get_audio = mlt_frame_pop_audio( this );
397 mlt_properties properties = MLT_FRAME_PROPERTIES( this );
398 int hide = mlt_properties_get_int( properties, "test_audio" );
400 if ( hide == 0 && get_audio != NULL )
402 mlt_position position = mlt_frame_get_position( this );
403 get_audio( this, buffer, format, frequency, channels, samples );
404 mlt_frame_set_position( this, position );
406 else if ( mlt_properties_get_data( properties, "audio", NULL ) )
408 *buffer = mlt_properties_get_data( properties, "audio", NULL );
409 *frequency = mlt_properties_get_int( properties, "audio_frequency" );
410 *channels = mlt_properties_get_int( properties, "audio_channels" );
411 *samples = mlt_properties_get_int( properties, "audio_samples" );
416 *samples = *samples <= 0 ? 1920 : *samples;
417 *channels = *channels <= 0 ? 2 : *channels;
418 *frequency = *frequency <= 0 ? 48000 : *frequency;
419 size = *samples * *channels * sizeof( int16_t );
420 *buffer = mlt_pool_alloc( size );
421 if ( *buffer != NULL )
422 memset( *buffer, 0, size );
423 mlt_properties_set_data( properties, "audio", *buffer, size, ( mlt_destructor )mlt_pool_release, NULL );
424 mlt_properties_set_int( properties, "test_audio", 1 );
427 mlt_properties_set_int( properties, "audio_frequency", *frequency );
428 mlt_properties_set_int( properties, "audio_channels", *channels );
429 mlt_properties_set_int( properties, "audio_samples", *samples );
431 if ( mlt_properties_get( properties, "meta.volume" ) )
433 double value = mlt_properties_get_double( properties, "meta.volume" );
436 memset( *buffer, 0, *samples * *channels * 2 );
437 mlt_properties_set_double( properties, "meta.volume", 1.0 );
439 else if ( value != 1.0 )
441 int total = *samples * *channels;
442 int16_t *p = *buffer;
448 mlt_properties_set_double( properties, "meta.volume", 1.0 );
455 unsigned char *mlt_frame_get_waveform( mlt_frame this, int w, int h )
458 mlt_properties properties = MLT_FRAME_PROPERTIES( this );
459 mlt_audio_format format = mlt_audio_pcm;
460 int frequency = 32000; // lower frequency available?
462 double fps = mlt_properties_get_double( properties, "fps" );
463 int samples = mlt_sample_calculator( fps, frequency, mlt_frame_get_position( this ) );
466 mlt_frame_get_audio( this, &pcm, &format, &frequency, &channels, &samples );
468 // Make an 8-bit buffer large enough to hold rendering
470 unsigned char *bitmap = ( unsigned char* )mlt_pool_alloc( size );
471 if ( bitmap != NULL )
472 memset( bitmap, 0, size );
473 mlt_properties_set_data( properties, "waveform", bitmap, size, ( mlt_destructor )mlt_pool_release, NULL );
475 // Render vertical lines
476 int16_t *ubound = pcm + samples * channels;
477 int skip = samples / w - 1;
480 // Iterate sample stream and along x coordinate
481 for ( i = 0; i < w && pcm < ubound; i++ )
483 // pcm data has channels interleaved
484 for ( j = 0; j < channels; j++ )
486 // Determine sample's magnitude from 2s complement;
487 int pcm_magnitude = *pcm < 0 ? ~(*pcm) + 1 : *pcm;
488 // The height of a line is the ratio of the magnitude multiplied by
489 // half the vertical resolution
490 int height = ( int )( ( double )( pcm_magnitude ) / 32768 * h / 2 );
491 // Determine the starting y coordinate - left channel above center,
492 // right channel below - currently assumes 2 channels
493 int displacement = ( h / 2 ) - ( 1 - j ) * height;
494 // Position buffer pointer using y coordinate, stride, and x coordinate
495 unsigned char *p = &bitmap[ i + displacement * w ];
497 // Draw vertical line
498 for ( k = 0; k < height; k++ )
503 pcm += skip * channels;
509 mlt_producer mlt_frame_get_original_producer( mlt_frame this )
512 return mlt_properties_get_data( MLT_FRAME_PROPERTIES( this ), "_producer", NULL );
516 void mlt_frame_close( mlt_frame this )
518 if ( this != NULL && mlt_properties_dec_ref( MLT_FRAME_PROPERTIES( this ) ) <= 0 )
520 mlt_deque_close( this->stack_image );
521 mlt_deque_close( this->stack_audio );
522 while( mlt_deque_peek_back( this->stack_service ) )
523 mlt_service_close( mlt_deque_pop_back( this->stack_service ) );
524 mlt_deque_close( this->stack_service );
525 mlt_properties_close( &this->parent );
530 /***** convenience functions *****/
532 int mlt_convert_rgb24a_to_yuv422( uint8_t *rgba, int width, int height, int stride, uint8_t *yuv, uint8_t *alpha )
535 register int y0, y1, u0, u1, v0, v1;
536 register int r, g, b;
537 register uint8_t *d = yuv;
540 for ( i = 0; i < height; i++ )
542 register uint8_t *s = rgba + ( stride * i );
543 for ( j = 0; j < ( width / 2 ); j++ )
549 RGB2YUV (r, g, b, y0, u0 , v0);
554 RGB2YUV (r, g, b, y1, u1 , v1);
566 RGB2YUV (r, g, b, y0, u0 , v0);
574 int mlt_convert_rgb24_to_yuv422( uint8_t *rgb, int width, int height, int stride, uint8_t *yuv )
577 register int y0, y1, u0, u1, v0, v1;
578 register int r, g, b;
579 register uint8_t *d = yuv;
582 for ( i = 0; i < height; i++ )
584 register uint8_t *s = rgb + ( stride * i );
585 for ( j = 0; j < ( width / 2 ); j++ )
590 RGB2YUV (r, g, b, y0, u0 , v0);
594 RGB2YUV (r, g, b, y1, u1 , v1);
605 RGB2YUV (r, g, b, y0, u0 , v0);
613 int mlt_convert_yuv420p_to_yuv422( uint8_t *yuv420p, int width, int height, int stride, uint8_t *yuv )
618 int half = width >> 1;
620 uint8_t *Y = yuv420p;
621 uint8_t *U = Y + width * height;
622 uint8_t *V = U + width * height / 4;
624 register uint8_t *d = yuv;
626 for ( i = 0; i < height; i++ )
628 register uint8_t *u = U + ( i / 2 ) * ( half );
629 register uint8_t *v = V + ( i / 2 ) * ( half );
631 for ( j = 0; j < half; j++ )
642 uint8_t *mlt_resize_alpha( uint8_t *input, int owidth, int oheight, int iwidth, int iheight )
644 uint8_t *output = NULL;
646 if ( input != NULL && ( iwidth != owidth || iheight != oheight ) && ( owidth > 6 && oheight > 6 ) )
648 iwidth = iwidth - ( iwidth % 2 );
649 owidth = owidth - ( owidth % 2 );
651 output = mlt_pool_alloc( owidth * oheight );
653 // Coordinates (0,0 is middle of output)
657 int out_x_range = owidth / 2;
658 int out_y_range = oheight / 2;
659 int in_x_range = iwidth / 2 < out_x_range ? iwidth / 2 : out_x_range;
660 int in_y_range = iheight / 2 < out_y_range ? iheight / 2 : out_y_range;
663 uint8_t *out_line = output;
664 uint8_t *out_ptr = out_line;
666 // Calculate a middle and possibly invalid pointer in the input
667 uint8_t *in_middle = input + iwidth * ( iheight / 2 ) + ( iwidth / 2 );
668 int in_line = - in_y_range * iwidth - in_x_range;
672 // Fill whole section with black
673 y = out_y_range - ( iheight / 2 );
674 int blank_elements = owidth * y;
675 elements = blank_elements;
676 while ( elements -- )
679 int active_width = iwidth;
680 int inactive_width = out_x_range - in_x_range;
684 // Loop for the entirety of our output height.
687 // Start at the beginning of the line
690 // Fill the outer part with black
691 elements = inactive_width;
692 while ( elements -- )
695 // We're in the input range for this row.
696 p = in_middle + in_line;
697 end = out_ptr + active_width;
698 while ( out_ptr != end )
701 // Fill the outer part with black
702 elements = inactive_width;
703 while ( elements -- )
706 // Move to next input line
709 // Move to next output line
713 // Fill whole section with black
714 elements = blank_elements;
715 while ( elements -- )
722 void mlt_resize_yuv422( uint8_t *output, int owidth, int oheight, uint8_t *input, int iwidth, int iheight )
725 int istride = iwidth * 2;
726 int ostride = owidth * 2;
728 iwidth = iwidth - ( iwidth % 2 );
729 owidth = owidth - ( owidth % 2 );
730 //iheight = iheight - ( iheight % 2 );
731 //oheight = oheight - ( oheight % 2 );
733 // Optimisation point
734 if ( output == NULL || input == NULL || ( owidth <= 6 || oheight <= 6 || iwidth <= 6 || oheight <= 6 ) )
738 else if ( iwidth == owidth && iheight == oheight )
740 memcpy( output, input, iheight * istride );
744 // Coordinates (0,0 is middle of output)
748 int out_x_range = owidth / 2;
749 int out_y_range = oheight / 2;
750 int in_x_range = iwidth / 2 < out_x_range ? iwidth / 2 : out_x_range;
751 int in_y_range = iheight / 2 < out_y_range ? iheight / 2 : out_y_range;
754 uint8_t *out_line = output;
755 uint8_t *out_ptr = out_line;
757 // Calculate a middle and possibly invalid pointer in the input
758 uint8_t *in_middle = input + istride * ( iheight / 2 ) + iwidth;
759 int in_line = - in_y_range * istride - in_x_range * 2;
763 // Fill whole section with black
764 y = out_y_range - ( iheight / 2 );
765 int blank_elements = ostride * y / 2;
766 elements = blank_elements;
767 while ( elements -- )
773 int active_width = 2 * iwidth;
774 int left_inactive_width = out_x_range - in_x_range;
775 int right_inactive_width = left_inactive_width;
783 right_inactive_width += 2;
786 // Loop for the entirety of our output height.
789 // Start at the beginning of the line
792 // Fill the outer part with black
793 elements = left_inactive_width;
794 while ( elements -- )
800 // We're in the input range for this row.
801 p = in_middle + in_line;
802 end = out_ptr + active_width;
803 while ( out_ptr != end )
809 // Fill the outer part with black
810 elements = right_inactive_width;
811 while ( elements -- )
817 // Move to next input line
820 // Move to next output line
824 // Fill whole section with black
825 elements = blank_elements;
826 while ( elements -- )
833 /** A resizing function for yuv422 frames - this does not rescale, but simply
834 resizes. It assumes yuv422 images available on the frame so use with care.
837 uint8_t *mlt_frame_resize_yuv422( mlt_frame this, int owidth, int oheight )
840 mlt_properties properties = MLT_FRAME_PROPERTIES( this );
842 // Get the input image, width and height
843 uint8_t *input = mlt_properties_get_data( properties, "image", NULL );
844 uint8_t *alpha = mlt_frame_get_alpha_mask( this );
846 int iwidth = mlt_properties_get_int( properties, "width" );
847 int iheight = mlt_properties_get_int( properties, "height" );
849 // If width and height are correct, don't do anything
850 if ( iwidth != owidth || iheight != oheight )
852 // Create the output image
853 uint8_t *output = mlt_pool_alloc( owidth * ( oheight + 1 ) * 2 );
855 // Call the generic resize
856 mlt_resize_yuv422( output, owidth, oheight, input, iwidth, iheight );
858 // Now update the frame
859 mlt_properties_set_data( properties, "image", output, owidth * ( oheight + 1 ) * 2, ( mlt_destructor )mlt_pool_release, NULL );
860 mlt_properties_set_int( properties, "width", owidth );
861 mlt_properties_set_int( properties, "height", oheight );
863 // We should resize the alpha too
864 alpha = mlt_resize_alpha( alpha, owidth, oheight, iwidth, iheight );
867 mlt_properties_set_data( properties, "alpha", alpha, owidth * ( oheight + 1 ), ( mlt_destructor )mlt_pool_release, NULL );
868 this->get_alpha_mask = NULL;
874 // No change, return input
878 /** A rescaling function for yuv422 frames - low quality, and provided for testing
879 only. It assumes yuv422 images available on the frame so use with care.
882 uint8_t *mlt_frame_rescale_yuv422( mlt_frame this, int owidth, int oheight )
885 mlt_properties properties = MLT_FRAME_PROPERTIES( this );
887 // Get the input image, width and height
888 uint8_t *input = mlt_properties_get_data( properties, "image", NULL );
889 int iwidth = mlt_properties_get_int( properties, "width" );
890 int iheight = mlt_properties_get_int( properties, "height" );
892 // If width and height are correct, don't do anything
893 if ( iwidth != owidth || iheight != oheight )
895 // Create the output image
896 uint8_t *output = mlt_pool_alloc( owidth * ( oheight + 1 ) * 2 );
899 int istride = iwidth * 2;
900 int ostride = owidth * 2;
902 iwidth = iwidth - ( iwidth % 4 );
904 // Derived coordinates
908 int out_x_range = owidth / 2;
909 int out_y_range = oheight / 2;
910 int in_x_range = iwidth / 2;
911 int in_y_range = iheight / 2;
914 register uint8_t *out_line = output;
915 register uint8_t *out_ptr;
917 // Calculate a middle pointer
918 uint8_t *in_middle = input + istride * in_y_range + in_x_range * 2;
921 // Generate the affine transform scaling values
922 register int scale_width = ( iwidth << 16 ) / owidth;
923 register int scale_height = ( iheight << 16 ) / oheight;
924 register int base = 0;
926 int outer = out_x_range * scale_width;
927 int bottom = out_y_range * scale_height;
929 // Loop for the entirety of our output height.
930 for ( dy = - bottom; dy < bottom; dy += scale_height )
932 // Start at the beginning of the line
935 // Pointer to the middle of the input line
936 in_line = in_middle + ( dy >> 16 ) * istride;
938 // Loop for the entirety of our output row.
939 for ( dx = - outer; dx < outer; dx += scale_width )
943 *out_ptr ++ = *( in_line + base );
945 *out_ptr ++ = *( in_line + base + 1 );
949 *out_ptr ++ = *( in_line + base );
951 *out_ptr ++ = *( in_line + base + 3 );
954 // Move to next output line
958 // Now update the frame
959 mlt_properties_set_data( properties, "image", output, owidth * ( oheight + 1 ) * 2, ( mlt_destructor )mlt_pool_release, NULL );
960 mlt_properties_set_int( properties, "width", owidth );
961 mlt_properties_set_int( properties, "height", oheight );
967 // No change, return input
971 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 )
975 int frequency_src = *frequency, frequency_dest = *frequency;
976 int channels_src = *channels, channels_dest = *channels;
977 int samples_src = *samples, samples_dest = *samples;
981 mlt_frame_get_audio( that, &src, format, &frequency_src, &channels_src, &samples_src );
982 mlt_frame_get_audio( this, &dest, format, &frequency_dest, &channels_dest, &samples_dest );
984 int silent = mlt_properties_get_int( MLT_FRAME_PROPERTIES( this ), "silent_audio" );
985 mlt_properties_set_int( MLT_FRAME_PROPERTIES( this ), "silent_audio", 0 );
987 memset( dest, 0, samples_dest * channels_dest * sizeof( int16_t ) );
989 silent = mlt_properties_get_int( MLT_FRAME_PROPERTIES( that ), "silent_audio" );
990 mlt_properties_set_int( MLT_FRAME_PROPERTIES( that ), "silent_audio", 0 );
992 memset( src, 0, samples_src * channels_src * sizeof( int16_t ) );
994 if ( channels_src > 6 )
996 if ( channels_dest > 6 )
998 if ( samples_src > 4000 )
1000 if ( samples_dest > 4000 )
1003 // determine number of samples to process
1004 *samples = samples_src < samples_dest ? samples_src : samples_dest;
1005 *channels = channels_src < channels_dest ? channels_src : channels_dest;
1007 *frequency = frequency_dest;
1009 // Compute a smooth ramp over start to end
1010 float weight = weight_start;
1011 float weight_step = ( weight_end - weight_start ) / *samples;
1014 for ( i = 0; i < *samples; i++ )
1016 for ( j = 0; j < *channels; j++ )
1018 if ( j < channels_dest )
1019 d = (double) dest[ i * channels_dest + j ];
1020 if ( j < channels_src )
1021 s = (double) src[ i * channels_src + j ];
1022 dest[ i * channels_dest + j ] = s * weight + d * ( 1.0 - weight );
1024 weight += weight_step;
1030 /* Will this break when mlt_position is converted to double? -Zach */
1031 int mlt_sample_calculator( float fps, int frequency, int64_t position )
1035 if ( ( int )( fps * 100 ) == 2997 )
1037 samples = frequency / 30;
1039 switch ( frequency )
1042 if ( position % 5 != 0 )
1046 if ( position % 300 == 0 )
1048 else if ( position % 30 == 0 )
1050 else if ( position % 2 == 0 )
1056 if ( position % 30 == 0 )
1058 else if ( position % 29 == 0 )
1060 else if ( position % 4 == 2 )
1069 else if ( fps != 0 )
1071 samples = frequency / fps;
1077 int64_t mlt_sample_calculator_to_now( float fps, int frequency, int64_t frame )
1079 int64_t samples = 0;
1081 // TODO: Correct rules for NTSC and drop the * 100 hack
1082 if ( ( int )( fps * 100 ) == 2997 )
1084 samples = ( ( double )( frame * frequency ) / 30 );
1088 samples += 2 * ( frame / 5 );
1091 samples += frame + ( frame / 2 ) - ( frame / 30 ) + ( frame / 300 );
1094 samples += ( 2 * frame ) - ( frame / 4 ) - ( frame / 29 );
1098 else if ( fps != 0 )
1100 samples = ( ( frame * frequency ) / ( int )fps );