| /* |
| * Copyright (c) 2007 Bobby Bingham |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| |
| #ifndef AVFILTER_VIDEO_H |
| #define AVFILTER_VIDEO_H |
| |
| #include "avfilter.h" |
| |
| AVFilterBufferRef *ff_default_get_video_buffer(AVFilterLink *link, |
| int perms, int w, int h); |
| AVFilterBufferRef *ff_null_get_video_buffer(AVFilterLink *link, int perms, int w, int h); |
| |
| /** |
| * Request a picture buffer with a specific set of permissions. |
| * |
| * @param link the output link to the filter from which the buffer will |
| * be requested |
| * @param perms the required access permissions |
| * @param w the minimum width of the buffer to allocate |
| * @param h the minimum height of the buffer to allocate |
| * @return A reference to the buffer. This must be unreferenced with |
| * avfilter_unref_buffer when you are finished with it. |
| */ |
| AVFilterBufferRef *ff_get_video_buffer(AVFilterLink *link, int perms, |
| int w, int h); |
| |
| int ff_inplace_start_frame(AVFilterLink *link, AVFilterBufferRef *picref); |
| int ff_null_start_frame(AVFilterLink *link, AVFilterBufferRef *picref); |
| int ff_null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir); |
| int ff_null_end_frame(AVFilterLink *link); |
| |
| /** |
| * Notify the next filter of the start of a frame. |
| * |
| * @param link the output link the frame will be sent over |
| * @param picref A reference to the frame about to be sent. The data for this |
| * frame need only be valid once draw_slice() is called for that |
| * portion. The receiving filter will free this reference when |
| * it no longer needs it. |
| * |
| * @return >= 0 on success, a negative AVERROR on error. This function will |
| * unreference picref in case of error. |
| */ |
| int ff_start_frame(AVFilterLink *link, AVFilterBufferRef *picref); |
| |
| /** |
| * Pass video frame along and keep an internal reference for later use. |
| */ |
| int ff_null_start_frame_keep_ref(AVFilterLink *inlink, AVFilterBufferRef *picref); |
| |
| /** |
| * Notify the next filter that the current frame has finished. |
| * |
| * @param link the output link the frame was sent over |
| * |
| * @return >= 0 on success, a negative AVERROR on error |
| */ |
| int ff_end_frame(AVFilterLink *link); |
| |
| /** |
| * Send a slice to the next filter. |
| * |
| * Slices have to be provided in sequential order, either in |
| * top-bottom or bottom-top order. If slices are provided in |
| * non-sequential order the behavior of the function is undefined. |
| * |
| * @param link the output link over which the frame is being sent |
| * @param y offset in pixels from the top of the image for this slice |
| * @param h height of this slice in pixels |
| * @param slice_dir the assumed direction for sending slices, |
| * from the top slice to the bottom slice if the value is 1, |
| * from the bottom slice to the top slice if the value is -1, |
| * for other values the behavior of the function is undefined. |
| * |
| * @return >= 0 on success, a negative AVERROR on error. |
| */ |
| int ff_draw_slice(AVFilterLink *link, int y, int h, int slice_dir); |
| |
| #endif /* AVFILTER_VIDEO_H */ |