2 * Copyright (c) 2007 Benoit Fouet
3 * Copyright (c) 2010 Stefano Sabatini
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 * horizontal flip filter
33 #include "libavutil/pixdesc.h"
34 #include "libavutil/internal.h"
35 #include "libavutil/intreadwrite.h"
36 #include "libavutil/imgutils.h"
39 int max_step[4]; ///< max pixel step for each plane, expressed as a number of bytes
40 int hsub, vsub; ///< chroma subsampling
43 static int query_formats(AVFilterContext *ctx)
45 AVFilterFormats *pix_fmts = NULL;
48 for (fmt = 0; fmt < AV_PIX_FMT_NB; fmt++) {
49 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt);
50 if (!(desc->flags & PIX_FMT_HWACCEL ||
51 desc->flags & PIX_FMT_BITSTREAM ||
52 (desc->log2_chroma_w != desc->log2_chroma_h &&
53 desc->comp[0].plane == desc->comp[1].plane)))
54 ff_add_format(&pix_fmts, fmt);
57 ff_set_common_formats(ctx, pix_fmts);
61 static int config_props(AVFilterLink *inlink)
63 FlipContext *flip = inlink->dst->priv;
64 const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format);
66 av_image_fill_max_pixsteps(flip->max_step, NULL, pix_desc);
67 flip->hsub = pix_desc->log2_chroma_w;
68 flip->vsub = pix_desc->log2_chroma_h;
73 static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *in)
75 AVFilterContext *ctx = inlink->dst;
76 FlipContext *flip = ctx->priv;
77 AVFilterLink *outlink = ctx->outputs[0];
78 AVFilterBufferRef *out;
79 uint8_t *inrow, *outrow;
80 int i, j, plane, step, hsub, vsub;
82 out = ff_get_video_buffer(outlink, AV_PERM_WRITE, outlink->w, outlink->h);
84 avfilter_unref_bufferp(&in);
85 return AVERROR(ENOMEM);
87 avfilter_copy_buffer_ref_props(out, in);
89 /* copy palette if required */
90 if (av_pix_fmt_desc_get(inlink->format)->flags & PIX_FMT_PAL)
91 memcpy(out->data[1], in->data[1], AVPALETTE_SIZE);
93 for (plane = 0; plane < 4 && in->data[plane]; plane++) {
94 step = flip->max_step[plane];
95 hsub = (plane == 1 || plane == 2) ? flip->hsub : 0;
96 vsub = (plane == 1 || plane == 2) ? flip->vsub : 0;
98 outrow = out->data[plane];
99 inrow = in ->data[plane] + ((inlink->w >> hsub) - 1) * step;
100 for (i = 0; i < in->video->h >> vsub; i++) {
103 for (j = 0; j < (inlink->w >> hsub); j++)
104 outrow[j] = inrow[-j];
109 uint16_t *outrow16 = (uint16_t *)outrow;
110 uint16_t * inrow16 = (uint16_t *) inrow;
111 for (j = 0; j < (inlink->w >> hsub); j++)
112 outrow16[j] = inrow16[-j];
119 uint8_t *out = outrow;
120 for (j = 0; j < (inlink->w >> hsub); j++, out += 3, in -= 3) {
121 int32_t v = AV_RB24(in);
129 uint32_t *outrow32 = (uint32_t *)outrow;
130 uint32_t * inrow32 = (uint32_t *) inrow;
131 for (j = 0; j < (inlink->w >> hsub); j++)
132 outrow32[j] = inrow32[-j];
137 for (j = 0; j < (inlink->w >> hsub); j++)
138 memcpy(outrow + j*step, inrow - j*step, step);
141 inrow += in ->linesize[plane];
142 outrow += out->linesize[plane];
146 avfilter_unref_bufferp(&in);
147 return ff_filter_frame(outlink, out);
150 static const AVFilterPad avfilter_vf_hflip_inputs[] = {
153 .type = AVMEDIA_TYPE_VIDEO,
154 .filter_frame = filter_frame,
155 .config_props = config_props,
156 .min_perms = AV_PERM_READ,
161 static const AVFilterPad avfilter_vf_hflip_outputs[] = {
164 .type = AVMEDIA_TYPE_VIDEO,
169 AVFilter avfilter_vf_hflip = {
171 .description = NULL_IF_CONFIG_SMALL("Horizontally flip the input video."),
172 .priv_size = sizeof(FlipContext),
173 .query_formats = query_formats,
175 .inputs = avfilter_vf_hflip_inputs,
176 .outputs = avfilter_vf_hflip_outputs,