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/* |
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* copyright (c) 2007 Bobby Bingham |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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/** |
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* @file libavfilter/vf_vflip.c |
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* video vertical flip filter |
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*/ |
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#include "avfilter.h" |
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typedef struct { |
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int vsub; ///< vertical chroma subsampling |
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} FlipContext; |
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static int config_input(AVFilterLink *link) |
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{ |
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FlipContext *flip = link->dst->priv; |
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int tmp; |
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avcodec_get_chroma_sub_sample(link->format, &tmp, &flip->vsub); |
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return 0; |
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} |
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static AVFilterPicRef *get_video_buffer(AVFilterLink *link, int perms, |
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int w, int h) |
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{ |
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FlipContext *flip = link->dst->priv; |
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int i; |
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AVFilterPicRef *picref = avfilter_get_video_buffer(link->dst->outputs[0], |
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perms, w, h); |
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picref->data[0] += (h-1) * picref->linesize[0]; |
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picref->linesize[0] = -picref->linesize[0]; |
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for (i = 1; i < 4; i ++) { |
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if (picref->data[i]) { |
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picref->data[i] += ((h >> flip->vsub)-1) * picref->linesize[i]; |
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picref->linesize[i] = -picref->linesize[i]; |
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} |
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} |
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return picref; |
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} |
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static void start_frame(AVFilterLink *link, AVFilterPicRef *picref) |
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{ |
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FlipContext *flip = link->dst->priv; |
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AVFilterPicRef *ref2 = avfilter_ref_pic(picref, ~0); |
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int i; |
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ref2->data[0] += (link->h-1) * ref2->linesize[0]; |
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ref2->linesize[0] = -ref2->linesize[0]; |
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for (i = 1; i < 4; i ++) { |
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if (ref2->data[i]) { |
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ref2->data[i] += ((link->h >> flip->vsub)-1) * ref2->linesize[i]; |
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ref2->linesize[i] = -ref2->linesize[i]; |
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} |
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} |
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avfilter_start_frame(link->dst->outputs[0], ref2); |
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} |
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static void draw_slice(AVFilterLink *link, int y, int h) |
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{ |
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AVFilterContext *ctx = link->dst; |
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avfilter_draw_slice(ctx->outputs[0], link->h - (y+h), h); |
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} |
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AVFilter avfilter_vf_vflip = { |
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.name = "vflip", |
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.priv_size = sizeof(FlipContext), |
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.inputs = (AVFilterPad[]) {{ .name = "default", |
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.type = CODEC_TYPE_VIDEO, |
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.get_video_buffer = get_video_buffer, |
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.start_frame = start_frame, |
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.draw_slice = draw_slice, |
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.config_props = config_input, }, |
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{ .name = NULL}}, |
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.outputs = (AVFilterPad[]) {{ .name = "default", |
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.type = CODEC_TYPE_VIDEO, }, |
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{ .name = NULL}}, |
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}; |