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libavfilter/vf_vflip.c

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00001 /*
00002  * copyright (c) 2007 Bobby Bingham
00003  *
00004  * This file is part of FFmpeg.
00005  *
00006  * FFmpeg is free software; you can redistribute it and/or
00007  * modify it under the terms of the GNU Lesser General Public
00008  * License as published by the Free Software Foundation; either
00009  * version 2.1 of the License, or (at your option) any later version.
00010  *
00011  * FFmpeg is distributed in the hope that it will be useful,
00012  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00013  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00014  * Lesser General Public License for more details.
00015  *
00016  * You should have received a copy of the GNU Lesser General Public
00017  * License along with FFmpeg; if not, write to the Free Software
00018  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00019  */
00020 
00026 #include "libavutil/pixdesc.h"
00027 #include "avfilter.h"
00028 
00029 typedef struct {
00030     int vsub;   
00031 } FlipContext;
00032 
00033 static int config_input(AVFilterLink *link)
00034 {
00035     FlipContext *flip = link->dst->priv;
00036 
00037     flip->vsub = av_pix_fmt_descriptors[link->format].log2_chroma_h;
00038 
00039     return 0;
00040 }
00041 
00042 static AVFilterPicRef *get_video_buffer(AVFilterLink *link, int perms,
00043                                         int w, int h)
00044 {
00045     FlipContext *flip = link->dst->priv;
00046     int i;
00047 
00048     AVFilterPicRef *picref = avfilter_get_video_buffer(link->dst->outputs[0],
00049                                                        perms, w, h);
00050 
00051     for (i = 0; i < 4; i ++) {
00052         int vsub = i == 1 || i == 2 ? flip->vsub : 0;
00053 
00054         if (picref->data[i]) {
00055             picref->data[i] += ((h >> vsub)-1) * picref->linesize[i];
00056             picref->linesize[i] = -picref->linesize[i];
00057         }
00058     }
00059 
00060     return picref;
00061 }
00062 
00063 static void start_frame(AVFilterLink *link, AVFilterPicRef *picref)
00064 {
00065     FlipContext *flip = link->dst->priv;
00066     int i;
00067 
00068     for (i = 0; i < 4; i ++) {
00069         int vsub = i == 1 || i == 2 ? flip->vsub : 0;
00070 
00071         if (picref->data[i]) {
00072             picref->data[i] += ((link->h >> vsub)-1) * picref->linesize[i];
00073             picref->linesize[i] = -picref->linesize[i];
00074         }
00075     }
00076 
00077     avfilter_start_frame(link->dst->outputs[0], picref);
00078 }
00079 
00080 static void draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
00081 {
00082     AVFilterContext *ctx = link->dst;
00083 
00084     avfilter_draw_slice(ctx->outputs[0], link->h - (y+h), h, -1 * slice_dir);
00085 }
00086 
00087 AVFilter avfilter_vf_vflip = {
00088     .name      = "vflip",
00089     .description = NULL_IF_CONFIG_SMALL("Flip the input video vertically."),
00090 
00091     .priv_size = sizeof(FlipContext),
00092 
00093     .inputs    = (AVFilterPad[]) {{ .name             = "default",
00094                                     .type             = AVMEDIA_TYPE_VIDEO,
00095                                     .get_video_buffer = get_video_buffer,
00096                                     .start_frame      = start_frame,
00097                                     .draw_slice       = draw_slice,
00098                                     .end_frame        = avfilter_null_end_frame,
00099                                     .config_props     = config_input, },
00100                                   { .name = NULL}},
00101     .outputs   = (AVFilterPad[]) {{ .name             = "default",
00102                                     .type             = AVMEDIA_TYPE_VIDEO, },
00103                                   { .name = NULL}},
00104 };

Generated on Fri Sep 16 2011 17:17:47 for FFmpeg by  doxygen 1.7.1