research.m1stereo.tv/gitweb/ - melted/blob - src/framework/mlt_frame.h

   1 /*
   2  * mlt_frame.h -- interface for all frame classes
   3  * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
   4  * Author: Charles Yates <charles.yates@pandora.be>
   5  *
   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.
  10  *
  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.
  15  *
  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.
  19  */
  20
  21 #ifndef _MLT_FRAME_H_
  22 #define _MLT_FRAME_H_
  23
  24 #include "mlt_properties.h"
  25 #include "mlt_deque.h"
  26
  27 typedef enum
  28 {
  29         mlt_video_standard_pal = 0,
  30         mlt_video_standard_ntsc
  31 }
  32 mlt_video_standard;
  33
  34 typedef enum
  35 {
  36         mlt_audio_none = 0,
  37         mlt_audio_pcm
  38 }
  39 mlt_audio_format;
  40
  41 typedef int ( *mlt_get_image )( mlt_frame this, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable );
  42
  43 struct mlt_frame_s
  44 {
  45         // We're extending properties here
  46         struct mlt_properties_s parent;
  47
  48         // Virtual methods
  49         int ( *get_audio )( mlt_frame this, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples );
  50         uint8_t * ( *get_alpha_mask )( mlt_frame this );
  51
  52         // Private properties
  53         mlt_deque stack_image;
  54         mlt_deque stack_audio;
  55 };
  56
  57 extern mlt_frame mlt_frame_init( );
  58 extern mlt_properties mlt_frame_properties( mlt_frame this );
  59 extern int mlt_frame_is_test_card( mlt_frame this );
  60 extern int mlt_frame_is_test_audio( mlt_frame this );
  61 extern double mlt_frame_get_aspect_ratio( mlt_frame this );
  62 extern int mlt_frame_set_aspect_ratio( mlt_frame this, double value );
  63 extern mlt_position mlt_frame_get_position( mlt_frame this );
  64 extern int mlt_frame_set_position( mlt_frame this, mlt_position value );
  65
  66 extern int mlt_frame_get_image( mlt_frame this, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable );
  67 extern uint8_t *mlt_frame_get_alpha_mask( mlt_frame this );
  68 extern int mlt_frame_get_audio( mlt_frame this, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples );
  69
  70 extern int mlt_frame_push_get_image( mlt_frame this, mlt_get_image get_image );
  71 extern mlt_get_image mlt_frame_pop_get_image( mlt_frame this );
  72 extern int mlt_frame_push_frame( mlt_frame this, mlt_frame that );
  73 extern mlt_frame mlt_frame_pop_frame( mlt_frame this );
  74 extern int mlt_frame_push_service( mlt_frame this, void *that );
  75 extern void *mlt_frame_pop_service( mlt_frame this );
  76
  77 extern int mlt_frame_push_audio( mlt_frame this, void *that );
  78 extern void *mlt_frame_pop_audio( mlt_frame this );
  79
  80 extern void mlt_frame_close( mlt_frame this );
  81
  82 /* convenience functions */
  83 extern int mlt_convert_rgb24a_to_yuv422( uint8_t *rgba, int width, int height, int stride, uint8_t *yuv, uint8_t *alpha );
  84 extern int mlt_convert_rgb24_to_yuv422( uint8_t *rgb, int width, int height, int stride, uint8_t *yuv );
  85 extern int mlt_convert_yuv420p_to_yuv422( uint8_t *yuv420p, int width, int height, int stride, uint8_t *yuv );
  86 extern uint8_t *mlt_frame_resize_yuv422( mlt_frame this, int owidth, int oheight );
  87 extern uint8_t *mlt_frame_rescale_yuv422( mlt_frame this, int owidth, int oheight );
  88 extern void mlt_resize_yuv422( uint8_t *output, int owidth, int oheight, uint8_t *input, int iwidth, int iheight );
  89 extern 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  );
  90 extern int mlt_sample_calculator( float fps, int frequency, int64_t position );
  91
  92 /* this macro scales rgb into the yuv gamut, y is scaled by 219/255 and uv by 224/255 */
  93 #define RGB2YUV(r, g, b, y, u, v)\
  94   y = ((257*r + 504*g + 98*b) >> 10) + 16;\
  95   u = ((-148*r - 291*g + 439*b) >> 10) + 128;\
  96   v = ((439*r - 368*g - 71*b) >> 10) + 128;\
  97   y = y < 16 ? 16 : y;\
  98   u = u < 16 ? 16 : u;\
  99   v = v < 16 ? 16 : v;\
 100   y = y > 235 ? 235 : y;\
 101   u = u > 240 ? 240 : u;\
 102   v = v > 240 ? 240 : v
 103
 104 /* this macro assumes the user has already scaled their rgb down into the broadcast limits */
 105 #define RGB2YUV_UNSCALED(r, g, b, y, u, v)\
 106   y = (299*r + 587*g + 114*b) >> 10;\
 107   u = ((-169*r - 331*g + 500*b) >> 10) + 128;\
 108   v = ((500*r - 419*g - 81*b) >> 10) + 128;\
 109   y = y < 16 ? 16 : y;\
 110   u = u < 16 ? 16 : u;\
 111   v = v < 16 ? 16 : v;\
 112   y = y > 235 ? 235 : y;\
 113   u = u > 240 ? 240 : u;\
 114   v = v > 240 ? 240 : v
 115
 116 #endif
 117