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avisynth_c.h
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1 // Avisynth C Interface Version 0.20
2 // Copyright 2003 Kevin Atkinson
3 
4 // This program is free software; you can redistribute it and/or modify
5 // it under the terms of the GNU General Public License as published by
6 // the Free Software Foundation; either version 2 of the License, or
7 // (at your option) any later version.
8 //
9 // This program is distributed in the hope that it will be useful,
10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 // GNU General Public License for more details.
13 //
14 // You should have received a copy of the GNU General Public License
15 // along with this program; if not, write to the Free Software
16 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
17 // MA 02110-1301 USA, or visit
18 // http://www.gnu.org/copyleft/gpl.html .
19 //
20 // As a special exception, I give you permission to link to the
21 // Avisynth C interface with independent modules that communicate with
22 // the Avisynth C interface solely through the interfaces defined in
23 // avisynth_c.h, regardless of the license terms of these independent
24 // modules, and to copy and distribute the resulting combined work
25 // under terms of your choice, provided that every copy of the
26 // combined work is accompanied by a complete copy of the source code
27 // of the Avisynth C interface and Avisynth itself (with the version
28 // used to produce the combined work), being distributed under the
29 // terms of the GNU General Public License plus this exception. An
30 // independent module is a module which is not derived from or based
31 // on Avisynth C Interface, such as 3rd-party filters, import and
32 // export plugins, or graphical user interfaces.
33 
34 // NOTE: this is a partial update of the Avisynth C interface to recognize
35 // new color spaces added in Avisynth 2.60. By no means is this document
36 // completely Avisynth 2.60 compliant.
37 
38 #ifndef __AVISYNTH_C__
39 #define __AVISYNTH_C__
40 
41 #ifdef __cplusplus
42 # define EXTERN_C extern "C"
43 #else
44 # define EXTERN_C
45 #endif
46 
47 #define AVSC_USE_STDCALL 1
48 
49 #ifndef AVSC_USE_STDCALL
50 # define AVSC_CC __cdecl
51 #else
52 # define AVSC_CC __stdcall
53 #endif
54 
55 #define AVSC_INLINE static __inline
56 
57 #ifdef AVISYNTH_C_EXPORTS
58 # define AVSC_EXPORT EXTERN_C
59 # define AVSC_API(ret, name) EXTERN_C __declspec(dllexport) ret AVSC_CC name
60 #else
61 # define AVSC_EXPORT EXTERN_C __declspec(dllexport)
62 # ifndef AVSC_NO_DECLSPEC
63 # define AVSC_API(ret, name) EXTERN_C __declspec(dllimport) ret AVSC_CC name
64 # else
65 # define AVSC_API(ret, name) typedef ret (AVSC_CC *name##_func)
66 # endif
67 #endif
68 
69 typedef unsigned char BYTE;
70 #ifdef __GNUC__
71 typedef long long int INT64;
72 #else
73 typedef __int64 INT64;
74 #endif
75 
76 
77 /////////////////////////////////////////////////////////////////////
78 //
79 // Constants
80 //
81 
82 #ifndef __AVISYNTH_H__
84 #endif
85 
86 enum {AVS_SAMPLE_INT8 = 1<<0,
91 
92 enum {AVS_PLANAR_Y=1<<0,
107 
108  // Colorspace properties.
109 enum {AVS_CS_BGR = 1<<28,
110  AVS_CS_YUV = 1<<29,
112  AVS_CS_PLANAR = 1<<31,
113 
117 
120  AVS_CS_SUB_WIDTH_2 = 0 << AVS_CS_SHIFT_SUB_WIDTH, // YV12, I420, YV16
122 
123  AVS_CS_VPLANEFIRST = 1 << 3, // YV12, YV16, YV24, YV411, YUV9
124  AVS_CS_UPLANEFIRST = 1 << 4, // I420
125 
127  AVS_CS_SUB_HEIGHT_1 = 3 << AVS_CS_SHIFT_SUB_HEIGHT, // YV16, YV24, YV411
130 
135 
138 
139  // Specific colorformats
140 enum {
145  // AVS_CS_YV12 = 1<<3 Reserved
146  // AVS_CS_I420 = 1<<4 Reserved
148 
157 };
158 
159 enum {
160  AVS_IT_BFF = 1<<0,
161  AVS_IT_TFF = 1<<1,
163 
164 enum {
175 
176 enum { //SUBTYPES
181 
182 enum {
189  };
190 
191 #define AVS_FRAME_ALIGN 16
192 
193 typedef struct AVS_Clip AVS_Clip;
195 
196 /////////////////////////////////////////////////////////////////////
197 //
198 // AVS_VideoInfo
199 //
200 
201 // AVS_VideoInfo is layed out identicly to VideoInfo
202 typedef struct AVS_VideoInfo {
203  int width, height; // width=0 means no video
206 
208 
209  int audio_samples_per_second; // 0 means no audio
213 
214  // Imagetype properties
215 
217 } AVS_VideoInfo;
218 
219 // useful functions of the above
221  { return (p->width!=0); }
222 
224  { return (p->audio_samples_per_second!=0); }
225 
227  { return !!(p->pixel_type&AVS_CS_BGR); }
228 
230  { return (p->pixel_type&AVS_CS_BGR24)==AVS_CS_BGR24; } // Clear out additional properties
231 
233  { return (p->pixel_type & AVS_CS_BGR32) == AVS_CS_BGR32 ; }
234 
236  { return !!(p->pixel_type&AVS_CS_YUV ); }
237 
239  { return (p->pixel_type & AVS_CS_YUY2) == AVS_CS_YUY2; }
240 
243 
246 
249 
252 
255 
256 AVSC_INLINE int avs_is_property(const AVS_VideoInfo * p, int property)
257  { return ((p->pixel_type & property)==property ); }
258 
260  { return !!(p->pixel_type & AVS_CS_PLANAR); }
261 
262 AVSC_INLINE int avs_is_color_space(const AVS_VideoInfo * p, int c_space)
263  { return avs_is_planar(p) ? ((p->pixel_type & AVS_CS_PLANAR_MASK) == (c_space & AVS_CS_PLANAR_FILTER)) : ((p->pixel_type & c_space) == c_space); }
264 
266  { return !!(p->image_type & AVS_IT_FIELDBASED); }
267 
269  { return ((p->image_type & AVS_IT_FIELDBASED)&&(p->image_type & (AVS_IT_BFF | AVS_IT_TFF))); }
270 
272  { return !!(p->image_type & AVS_IT_BFF); }
273 
275  { return !!(p->image_type & AVS_IT_TFF); }
276 
278 {
279  switch (p->pixel_type) {
280  case AVS_CS_BGR24: return 24;
281  case AVS_CS_BGR32: return 32;
282  case AVS_CS_YUY2: return 16;
283  case AVS_CS_YV12:
284  case AVS_CS_I420: return 12;
285  default: return 0;
286  }
287 }
289  { return pixels * (avs_bits_per_pixel(p)>>3); } // Will work on planar images, but will return only luma planes
290 
292  { return avs_bytes_from_pixels(p,p->width); } // Also only returns first plane on planar images
293 
295  { if (avs_is_planar(vi)) {int p = vi->height * ((avs_row_size(vi)+3) & ~3); p+=p>>1; return p; } return vi->height * ((avs_row_size(vi)+3) & ~3); }
296 
298  { return p->audio_samples_per_second; }
299 
300 
302 {
303  switch (p->sample_type) {
304  case AVS_SAMPLE_INT8: return sizeof(signed char);
305  case AVS_SAMPLE_INT16: return sizeof(signed short);
306  case AVS_SAMPLE_INT24: return 3;
307  case AVS_SAMPLE_INT32: return sizeof(signed int);
308  case AVS_SAMPLE_FLOAT: return sizeof(float);
309  default: return 0;
310  }
311 }
313  { return p->nchannels*avs_bytes_per_channel_sample(p);}
314 
316  { return ((INT64)(frames) * p->audio_samples_per_second * p->fps_denominator / p->fps_numerator); }
317 
319  { return (int)(samples * (INT64)p->fps_numerator / (INT64)p->fps_denominator / (INT64)p->audio_samples_per_second); }
320 
322  { return bytes / avs_bytes_per_audio_sample(p); }
323 
325  { return samples * avs_bytes_per_audio_sample(p); }
326 
328  { return p->nchannels; }
329 
331  { return p->sample_type;}
332 
333 // useful mutator
335  { p->image_type|=property; }
336 
338  { p->image_type&=~property; }
339 
340 AVSC_INLINE void avs_set_field_based(AVS_VideoInfo * p, int isfieldbased)
341  { if (isfieldbased) p->image_type|=AVS_IT_FIELDBASED; else p->image_type&=~AVS_IT_FIELDBASED; }
342 
343 AVSC_INLINE void avs_set_fps(AVS_VideoInfo * p, unsigned numerator, unsigned denominator)
344 {
345  unsigned x=numerator, y=denominator;
346  while (y) { // find gcd
347  unsigned t = x%y; x = y; y = t;
348  }
349  p->fps_numerator = numerator/x;
350  p->fps_denominator = denominator/x;
351 }
352 
354 {
355  return (x->pixel_type == y->pixel_type)
356  || (avs_is_yv12(x) && avs_is_yv12(y));
357 }
358 
359 /////////////////////////////////////////////////////////////////////
360 //
361 // AVS_VideoFrame
362 //
363 
364 // VideoFrameBuffer holds information about a memory block which is used
365 // for video data. For efficiency, instances of this class are not deleted
366 // when the refcount reaches zero; instead they're stored in a linked list
367 // to be reused. The instances are deleted when the corresponding AVS
368 // file is closed.
369 
370 // AVS_VideoFrameBuffer is layed out identicly to VideoFrameBuffer
371 // DO NOT USE THIS STRUCTURE DIRECTLY
372 typedef struct AVS_VideoFrameBuffer {
375  // sequence_number is incremented every time the buffer is changed, so
376  // that stale views can tell they're no longer valid.
377  volatile long sequence_number;
378 
379  volatile long refcount;
381 
382 // VideoFrame holds a "window" into a VideoFrameBuffer.
383 
384 // AVS_VideoFrame is layed out identicly to IVideoFrame
385 // DO NOT USE THIS STRUCTURE DIRECTLY
386 typedef struct AVS_VideoFrame {
387  volatile long refcount;
389  int offset, pitch, row_size, height, offsetU, offsetV, pitchUV; // U&V offsets are from top of picture.
392 
393 // Access functions for AVS_VideoFrame
395  return p->pitch;}
396 
397 AVSC_INLINE int avs_get_pitch_p(const AVS_VideoFrame * p, int plane) {
398  switch (plane) {
399  case AVS_PLANAR_U: case AVS_PLANAR_V: return p->pitchUV;}
400  return p->pitch;}
401 
403  return p->row_size; }
404 
405 AVSC_INLINE int avs_get_row_size_p(const AVS_VideoFrame * p, int plane) {
406  int r;
407  switch (plane) {
408  case AVS_PLANAR_U: case AVS_PLANAR_V:
409  if (p->pitchUV) return p->row_sizeUV;
410  else return 0;
412  if (p->pitchUV) {
413  r = (p->row_sizeUV+AVS_FRAME_ALIGN-1)&(~(AVS_FRAME_ALIGN-1)); // Aligned rowsize
414  if (r < p->pitchUV)
415  return r;
416  return p->row_sizeUV;
417  } else return 0;
419  r = (p->row_size+AVS_FRAME_ALIGN-1)&(~(AVS_FRAME_ALIGN-1)); // Aligned rowsize
420  if (r <= p->pitch)
421  return r;
422  return p->row_size;
423  }
424  return p->row_size;
425 }
426 
428  return p->height;}
429 
430 AVSC_INLINE int avs_get_height_p(const AVS_VideoFrame * p, int plane) {
431  switch (plane) {
432  case AVS_PLANAR_U: case AVS_PLANAR_V:
433  if (p->pitchUV) return p->heightUV;
434  return 0;
435  }
436  return p->height;}
437 
439  return p->vfb->data + p->offset;}
440 
441 AVSC_INLINE const BYTE* avs_get_read_ptr_p(const AVS_VideoFrame * p, int plane)
442 {
443  switch (plane) {
444  case AVS_PLANAR_U: return p->vfb->data + p->offsetU;
445  case AVS_PLANAR_V: return p->vfb->data + p->offsetV;
446  default: return p->vfb->data + p->offset;}
447 }
448 
450  return (p->refcount == 1 && p->vfb->refcount == 1);}
451 
453 {
454  if (avs_is_writable(p)) {
455  ++p->vfb->sequence_number;
456  return p->vfb->data + p->offset;
457  } else
458  return 0;
459 }
460 
462 {
463  if (plane==AVS_PLANAR_Y && avs_is_writable(p)) {
464  ++p->vfb->sequence_number;
465  return p->vfb->data + p->offset;
466  } else if (plane==AVS_PLANAR_Y) {
467  return 0;
468  } else {
469  switch (plane) {
470  case AVS_PLANAR_U: return p->vfb->data + p->offsetU;
471  case AVS_PLANAR_V: return p->vfb->data + p->offsetV;
472  default: return p->vfb->data + p->offset;
473  }
474  }
475 }
476 
477 
478 AVSC_API(void, avs_release_video_frame)(AVS_VideoFrame *);
479 // makes a shallow copy of a video frame
480 AVSC_API(AVS_VideoFrame *, avs_copy_video_frame)(AVS_VideoFrame *);
481 
482 #ifndef AVSC_NO_DECLSPEC
484  {avs_release_video_frame(f);}
486  {return avs_copy_video_frame(f);}
487 #endif
488 
489 /////////////////////////////////////////////////////////////////////
490 //
491 // AVS_Value
492 //
493 
494 // Treat AVS_Value as a fat pointer. That is use avs_copy_value
495 // and avs_release_value appropiaty as you would if AVS_Value was
496 // a pointer.
497 
498 // To maintain source code compatibility with future versions of the
499 // avisynth_c API don't use the AVS_Value directly. Use the helper
500 // functions below.
501 
502 // AVS_Value is layed out identicly to AVSValue
503 typedef struct AVS_Value AVS_Value;
504 struct AVS_Value {
505  short type; // 'a'rray, 'c'lip, 'b'ool, 'i'nt, 'f'loat, 's'tring, 'v'oid, or 'l'ong
506  // for some function e'rror
507  short array_size;
508  union {
509  void * clip; // do not use directly, use avs_take_clip
510  char boolean;
511  int integer;
512  float floating_pt;
513  const char * string;
514  const AVS_Value * array;
515  } d;
516 };
517 
518 // AVS_Value should be initilized with avs_void.
519 // Should also set to avs_void after the value is released
520 // with avs_copy_value. Consider it the equalvent of setting
521 // a pointer to NULL
522 static const AVS_Value avs_void = {'v'};
523 
524 AVSC_API(void, avs_copy_value)(AVS_Value * dest, AVS_Value src);
525 AVSC_API(void, avs_release_value)(AVS_Value);
526 
527 AVSC_INLINE int avs_defined(AVS_Value v) { return v.type != 'v'; }
528 AVSC_INLINE int avs_is_clip(AVS_Value v) { return v.type == 'c'; }
529 AVSC_INLINE int avs_is_bool(AVS_Value v) { return v.type == 'b'; }
530 AVSC_INLINE int avs_is_int(AVS_Value v) { return v.type == 'i'; }
531 AVSC_INLINE int avs_is_float(AVS_Value v) { return v.type == 'f' || v.type == 'i'; }
532 AVSC_INLINE int avs_is_string(AVS_Value v) { return v.type == 's'; }
533 AVSC_INLINE int avs_is_array(AVS_Value v) { return v.type == 'a'; }
534 AVSC_INLINE int avs_is_error(AVS_Value v) { return v.type == 'e'; }
535 
536 AVSC_API(AVS_Clip *, avs_take_clip)(AVS_Value, AVS_ScriptEnvironment *);
537 AVSC_API(void, avs_set_to_clip)(AVS_Value *, AVS_Clip *);
538 
540  { return v.d.boolean; }
542  { return v.d.integer; }
544  { return avs_is_error(v) || avs_is_string(v) ? v.d.string : 0; }
546  { return avs_is_int(v) ? v.d.integer : v.d.floating_pt; }
548  { return avs_is_error(v) ? v.d.string : 0; }
550  { return v.d.array; }
552  { return avs_is_array(v) ? v.array_size : 1; }
554  { return avs_is_array(v) ? v.d.array[index] : v; }
555 
556 // only use these functions on an AVS_Value that does not already have
557 // an active value. Remember, treat AVS_Value as a fat pointer.
559  { AVS_Value v; v.type = 'b'; v.d.boolean = v0 == 0 ? 0 : 1; return v; }
561  { AVS_Value v; v.type = 'i'; v.d.integer = v0; return v; }
563  { AVS_Value v; v.type = 's'; v.d.string = v0; return v; }
565  { AVS_Value v; v.type = 'f'; v.d.floating_pt = v0; return v;}
567  { AVS_Value v; v.type = 'e'; v.d.string = v0; return v; }
568 #ifndef AVSC_NO_DECLSPEC
570  { AVS_Value v; avs_set_to_clip(&v, v0); return v; }
571 #endif
573  { AVS_Value v; v.type = 'a'; v.d.array = v0; v.array_size = size; return v; }
574 
575 /////////////////////////////////////////////////////////////////////
576 //
577 // AVS_Clip
578 //
579 
580 AVSC_API(void, avs_release_clip)(AVS_Clip *);
581 AVSC_API(AVS_Clip *, avs_copy_clip)(AVS_Clip *);
582 
583 AVSC_API(const char *, avs_clip_get_error)(AVS_Clip *); // return 0 if no error
584 
585 AVSC_API(const AVS_VideoInfo *, avs_get_video_info)(AVS_Clip *);
586 
587 AVSC_API(int, avs_get_version)(AVS_Clip *);
588 
589 AVSC_API(AVS_VideoFrame *, avs_get_frame)(AVS_Clip *, int n);
590 // The returned video frame must be released with avs_release_video_frame
591 
592 AVSC_API(int, avs_get_parity)(AVS_Clip *, int n);
593 // return field parity if field_based, else parity of first field in frame
594 
595 AVSC_API(int, avs_get_audio)(AVS_Clip *, void * buf,
597 // start and count are in samples
598 
599 AVSC_API(int, avs_set_cache_hints)(AVS_Clip *,
601 
602 // This is the callback type used by avs_add_function
603 typedef AVS_Value (AVSC_CC * AVS_ApplyFunc)
605 
606 typedef struct AVS_FilterInfo AVS_FilterInfo;
608 {
609  // these members should not be modified outside of the AVS_ApplyFunc callback
615  int (AVSC_CC * get_audio)(AVS_FilterInfo *, void * buf,
617  int (AVSC_CC * set_cache_hints)(AVS_FilterInfo *, int cachehints,
618  int frame_range);
619  void (AVSC_CC * free_filter)(AVS_FilterInfo *);
620 
621  // Should be set when ever there is an error to report.
622  // It is cleared before any of the above methods are called
623  const char * error;
624  // this is to store whatever and may be modified at will
625  void * user_data;
626 };
627 
628 // Create a new filter
629 // fi is set to point to the AVS_FilterInfo so that you can
630 // modify it once it is initilized.
631 // store_child should generally be set to true. If it is not
632 // set than ALL methods (the function pointers) must be defined
633 // If it is set than you do not need to worry about freeing the child
634 // clip.
635 AVSC_API(AVS_Clip *, avs_new_c_filter)(AVS_ScriptEnvironment * e,
638 
639 /////////////////////////////////////////////////////////////////////
640 //
641 // AVS_ScriptEnvironment
642 //
643 
644 // For GetCPUFlags. These are backwards-compatible with those in VirtualDub.
645 enum {
646  /* slowest CPU to support extension */
647  AVS_CPU_FORCE = 0x01, // N/A
648  AVS_CPU_FPU = 0x02, // 386/486DX
649  AVS_CPU_MMX = 0x04, // P55C, K6, PII
650  AVS_CPU_INTEGER_SSE = 0x08, // PIII, Athlon
651  AVS_CPU_SSE = 0x10, // PIII, Athlon XP/MP
652  AVS_CPU_SSE2 = 0x20, // PIV, Hammer
653  AVS_CPU_3DNOW = 0x40, // K6-2
654  AVS_CPU_3DNOW_EXT = 0x80, // Athlon
655  AVS_CPU_X86_64 = 0xA0, // Hammer (note: equiv. to 3DNow + SSE2,
656  // which only Hammer will have anyway)
657  AVS_CPUF_SSE3 = 0x100, // PIV+, K8 Venice
658  AVS_CPUF_SSSE3 = 0x200, // Core 2
659  AVS_CPUF_SSE4 = 0x400, // Penryn, Wolfdale, Yorkfield
661  AVS_CPUF_SSE4_2 = 0x800, // Nehalem
662 };
663 
664 AVSC_API(const char *, avs_get_error)(AVS_ScriptEnvironment *); // return 0 if no error
665 
666 AVSC_API(long, avs_get_cpu_flags)(AVS_ScriptEnvironment *);
667 AVSC_API(int, avs_check_version)(AVS_ScriptEnvironment *, int version);
668 
669 AVSC_API(char *, avs_save_string)(AVS_ScriptEnvironment *, const char* s, int length);
670 AVSC_API(char *, avs_sprintf)(AVS_ScriptEnvironment *, const char * fmt, ...);
671 
672 AVSC_API(char *, avs_vsprintf)(AVS_ScriptEnvironment *, const char * fmt, void* val);
673  // note: val is really a va_list; I hope everyone typedefs va_list to a pointer
674 
675 AVSC_API(int, avs_add_function)(AVS_ScriptEnvironment *,
676  const char * name, const char * params,
677  AVS_ApplyFunc apply, void * user_data);
678 
679 AVSC_API(int, avs_function_exists)(AVS_ScriptEnvironment *, const char * name);
680 
681 AVSC_API(AVS_Value, avs_invoke)(AVS_ScriptEnvironment *, const char * name,
682  AVS_Value args, const char** arg_names);
683 // The returned value must be be released with avs_release_value
684 
685 AVSC_API(AVS_Value, avs_get_var)(AVS_ScriptEnvironment *, const char* name);
686 // The returned value must be be released with avs_release_value
687 
688 AVSC_API(int, avs_set_var)(AVS_ScriptEnvironment *, const char* name, AVS_Value val);
689 
690 AVSC_API(int, avs_set_global_var)(AVS_ScriptEnvironment *, const char* name, const AVS_Value val);
691 
692 //void avs_push_context(AVS_ScriptEnvironment *, int level=0);
693 //void avs_pop_context(AVS_ScriptEnvironment *);
694 
695 AVSC_API(AVS_VideoFrame *, avs_new_video_frame_a)(AVS_ScriptEnvironment *,
696  const AVS_VideoInfo * vi, int align);
697 // align should be at least 16
698 
699 #ifndef AVSC_NO_DECLSPEC
702  const AVS_VideoInfo * vi)
703  {return avs_new_video_frame_a(env,vi,AVS_FRAME_ALIGN);}
704 
707  const AVS_VideoInfo * vi)
708  {return avs_new_video_frame_a(env,vi,AVS_FRAME_ALIGN);}
709 #endif
710 
711 
712 AVSC_API(int, avs_make_writable)(AVS_ScriptEnvironment *, AVS_VideoFrame * * pvf);
713 
714 AVSC_API(void, avs_bit_blt)(AVS_ScriptEnvironment *, BYTE* dstp, int dst_pitch, const BYTE* srcp, int src_pitch, int row_size, int height);
715 
717 AVSC_API(void, avs_at_exit)(AVS_ScriptEnvironment *, AVS_ShutdownFunc function, void * user_data);
718 
720 // The returned video frame must be be released
721 
722 AVSC_API(int, avs_set_memory_max)(AVS_ScriptEnvironment *, int mem);
723 
724 AVSC_API(int, avs_set_working_dir)(AVS_ScriptEnvironment *, const char * newdir);
725 
726 // avisynth.dll exports this; it's a way to use it as a library, without
727 // writing an AVS script or without going through AVIFile.
728 AVSC_API(AVS_ScriptEnvironment *, avs_create_script_environment)(int version);
729 
730 // this symbol is the entry point for the plugin and must
731 // be defined
734 
735 
736 AVSC_API(void, avs_delete_script_environment)(AVS_ScriptEnvironment *);
737 
738 
740 // The returned video frame must be be released
741 
742 #ifdef AVSC_NO_DECLSPEC
743 // use LoadLibrary and related functions to dynamically load Avisynth instead of declspec(dllimport)
744 /*
745  The following functions needs to have been declared, probably from windows.h
746 
747  void* malloc(size_t)
748  void free(void*);
749 
750  HMODULE LoadLibrary(const char*);
751  void* GetProcAddress(HMODULE, const char*);
752  FreeLibrary(HMODULE);
753 */
754 
755 
756 typedef struct AVS_Library AVS_Library;
757 
758 #define AVSC_DECLARE_FUNC(name) name##_func name
759 
760 struct AVS_Library {
761  HMODULE handle;
762 
763  AVSC_DECLARE_FUNC(avs_add_function);
764  AVSC_DECLARE_FUNC(avs_at_exit);
765  AVSC_DECLARE_FUNC(avs_bit_blt);
766  AVSC_DECLARE_FUNC(avs_check_version);
767  AVSC_DECLARE_FUNC(avs_clip_get_error);
768  AVSC_DECLARE_FUNC(avs_copy_clip);
769  AVSC_DECLARE_FUNC(avs_copy_value);
770  AVSC_DECLARE_FUNC(avs_copy_video_frame);
771  AVSC_DECLARE_FUNC(avs_create_script_environment);
772  AVSC_DECLARE_FUNC(avs_delete_script_environment);
773  AVSC_DECLARE_FUNC(avs_function_exists);
774  AVSC_DECLARE_FUNC(avs_get_audio);
775  AVSC_DECLARE_FUNC(avs_get_cpu_flags);
776  AVSC_DECLARE_FUNC(avs_get_error);
777  AVSC_DECLARE_FUNC(avs_get_frame);
778  AVSC_DECLARE_FUNC(avs_get_parity);
779  AVSC_DECLARE_FUNC(avs_get_var);
780  AVSC_DECLARE_FUNC(avs_get_version);
781  AVSC_DECLARE_FUNC(avs_get_video_info);
782  AVSC_DECLARE_FUNC(avs_invoke);
783  AVSC_DECLARE_FUNC(avs_make_writable);
784  AVSC_DECLARE_FUNC(avs_new_c_filter);
785  AVSC_DECLARE_FUNC(avs_new_video_frame_a);
786  AVSC_DECLARE_FUNC(avs_release_clip);
787  AVSC_DECLARE_FUNC(avs_release_value);
788  AVSC_DECLARE_FUNC(avs_release_video_frame);
789  AVSC_DECLARE_FUNC(avs_save_string);
790  AVSC_DECLARE_FUNC(avs_set_cache_hints);
791  AVSC_DECLARE_FUNC(avs_set_global_var);
792  AVSC_DECLARE_FUNC(avs_set_memory_max);
793  AVSC_DECLARE_FUNC(avs_set_to_clip);
794  AVSC_DECLARE_FUNC(avs_set_var);
795  AVSC_DECLARE_FUNC(avs_set_working_dir);
796  AVSC_DECLARE_FUNC(avs_sprintf);
797  AVSC_DECLARE_FUNC(avs_subframe);
798  AVSC_DECLARE_FUNC(avs_subframe_planar);
799  AVSC_DECLARE_FUNC(avs_take_clip);
800  AVSC_DECLARE_FUNC(avs_vsprintf);
801 };
802 
803 #undef AVSC_DECLARE_FUNC
804 
805 
806 AVSC_INLINE AVS_Library * avs_load_library() {
807  AVS_Library *library = (AVS_Library *)malloc(sizeof(AVS_Library));
808  if (!library)
809  return NULL;
810  library->handle = LoadLibrary("avisynth");
811  if (library->handle == NULL)
812  goto fail;
813 
814 #define __AVSC_STRINGIFY(x) #x
815 #define AVSC_STRINGIFY(x) __AVSC_STRINGIFY(x)
816 #define AVSC_LOAD_FUNC(name) {\
817  library->name = (name##_func) GetProcAddress(library->handle, AVSC_STRINGIFY(name));\
818  if (library->name == NULL)\
819  goto fail;\
820 }
821 
822  AVSC_LOAD_FUNC(avs_add_function);
823  AVSC_LOAD_FUNC(avs_at_exit);
824  AVSC_LOAD_FUNC(avs_bit_blt);
825  AVSC_LOAD_FUNC(avs_check_version);
826  AVSC_LOAD_FUNC(avs_clip_get_error);
827  AVSC_LOAD_FUNC(avs_copy_clip);
828  AVSC_LOAD_FUNC(avs_copy_value);
829  AVSC_LOAD_FUNC(avs_copy_video_frame);
830  AVSC_LOAD_FUNC(avs_create_script_environment);
831  AVSC_LOAD_FUNC(avs_delete_script_environment);
832  AVSC_LOAD_FUNC(avs_function_exists);
833  AVSC_LOAD_FUNC(avs_get_audio);
834  AVSC_LOAD_FUNC(avs_get_cpu_flags);
835  AVSC_LOAD_FUNC(avs_get_error);
836  AVSC_LOAD_FUNC(avs_get_frame);
837  AVSC_LOAD_FUNC(avs_get_parity);
838  AVSC_LOAD_FUNC(avs_get_var);
839  AVSC_LOAD_FUNC(avs_get_version);
840  AVSC_LOAD_FUNC(avs_get_video_info);
841  AVSC_LOAD_FUNC(avs_invoke);
842  AVSC_LOAD_FUNC(avs_make_writable);
843  AVSC_LOAD_FUNC(avs_new_c_filter);
844  AVSC_LOAD_FUNC(avs_new_video_frame_a);
845  AVSC_LOAD_FUNC(avs_release_clip);
846  AVSC_LOAD_FUNC(avs_release_value);
847  AVSC_LOAD_FUNC(avs_release_video_frame);
848  AVSC_LOAD_FUNC(avs_save_string);
849  AVSC_LOAD_FUNC(avs_set_cache_hints);
850  AVSC_LOAD_FUNC(avs_set_global_var);
851  AVSC_LOAD_FUNC(avs_set_memory_max);
852  AVSC_LOAD_FUNC(avs_set_to_clip);
853  AVSC_LOAD_FUNC(avs_set_var);
854  AVSC_LOAD_FUNC(avs_set_working_dir);
855  AVSC_LOAD_FUNC(avs_sprintf);
856  AVSC_LOAD_FUNC(avs_subframe);
857  AVSC_LOAD_FUNC(avs_subframe_planar);
858  AVSC_LOAD_FUNC(avs_take_clip);
859  AVSC_LOAD_FUNC(avs_vsprintf);
860 
861 #undef __AVSC_STRINGIFY
862 #undef AVSC_STRINGIFY
863 #undef AVSC_LOAD_FUNC
864 
865  return library;
866 
867 fail:
868  free(library);
869  return NULL;
870 }
871 
872 AVSC_INLINE void avs_free_library(AVS_Library *library) {
873  if (!library)
874  return;
875  FreeLibrary(library->handle);
876  free(library);
877 }
878 #endif
879 
880 #endif