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FFmpeg/libavfilter/video.h

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  1. /*

  2.  * Copyright (c) 2007 Bobby Bingham

  3.  *

  4.  * This file is part of FFmpeg.

  5.  *

  6.  * FFmpeg is free software; you can redistribute it and/or

  7.  * modify it under the terms of the GNU Lesser General Public

  8.  * License as published by the Free Software Foundation; either

  9.  * version 2.1 of the License, or (at your option) any later version.

  10.  *

  11.  * FFmpeg 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 GNU

  14.  * Lesser General Public License for more details.

  15.  *

  16.  * You should have received a copy of the GNU Lesser General Public

  17.  * License along with FFmpeg; if not, write to the Free Software

  18.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  19.  */

  20. 

  21. 

  22. #ifndef AVFILTER_VIDEO_H

  23. #define AVFILTER_VIDEO_H

  24. 

  25. #include "avfilter.h"

  26. 

  27. AVFilterBufferRef *ff_default_get_video_buffer(AVFilterLink *link,

  28.                                                int perms, int w, int h);

  29. AVFilterBufferRef *ff_null_get_video_buffer(AVFilterLink *link, int perms, int w, int h);

  30. 

  31. 

  32. void ff_null_start_frame(AVFilterLink *link, AVFilterBufferRef *picref);

  33. void ff_null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir);

  34. void ff_null_end_frame(AVFilterLink *link);

  35. 

  36. /**

  37.  * Notify the next filter of the start of a frame.

  38.  *

  39.  * @param link   the output link the frame will be sent over

  40.  * @param picref A reference to the frame about to be sent. The data for this

  41.  *               frame need only be valid once draw_slice() is called for that

  42.  *               portion. The receiving filter will free this reference when

  43.  *               it no longer needs it.

  44.  */

  45. void ff_start_frame(AVFilterLink *link, AVFilterBufferRef *picref);

  46. 

  47. /**

  48.  * Notify the next filter that the current frame has finished.

  49.  *

  50.  * @param link the output link the frame was sent over

  51.  */

  52. void ff_end_frame(AVFilterLink *link);

  53. 

  54. /**

  55.  * Send a slice to the next filter.

  56.  *

  57.  * Slices have to be provided in sequential order, either in

  58.  * top-bottom or bottom-top order. If slices are provided in

  59.  * non-sequential order the behavior of the function is undefined.

  60.  *

  61.  * @param link the output link over which the frame is being sent

  62.  * @param y    offset in pixels from the top of the image for this slice

  63.  * @param h    height of this slice in pixels

  64.  * @param slice_dir the assumed direction for sending slices,

  65.  *             from the top slice to the bottom slice if the value is 1,

  66.  *             from the bottom slice to the top slice if the value is -1,

  67.  *             for other values the behavior of the function is undefined.

  68.  */

  69. void ff_draw_slice(AVFilterLink *link, int y, int h, int slice_dir);

  70. 

  71. #endif /* AVFILTER_VIDEO_H */