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 static const enum AVPixelFormat pix_fmts[] = {
46 AV_PIX_FMT_RGB48BE, AV_PIX_FMT_RGB48LE,
47 AV_PIX_FMT_BGR48BE, AV_PIX_FMT_BGR48LE,
48 AV_PIX_FMT_ARGB, AV_PIX_FMT_RGBA,
49 AV_PIX_FMT_ABGR, AV_PIX_FMT_BGRA,
50 AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24,
51 AV_PIX_FMT_RGB565BE, AV_PIX_FMT_RGB565LE,
52 AV_PIX_FMT_RGB555BE, AV_PIX_FMT_RGB555LE,
53 AV_PIX_FMT_RGB444BE, AV_PIX_FMT_RGB444LE,
54 AV_PIX_FMT_BGR565BE, AV_PIX_FMT_BGR565LE,
55 AV_PIX_FMT_BGR555BE, AV_PIX_FMT_BGR555LE,
56 AV_PIX_FMT_BGR444BE, AV_PIX_FMT_BGR444LE,
57 AV_PIX_FMT_GRAY16BE, AV_PIX_FMT_GRAY16LE,
58 AV_PIX_FMT_YUV420P16LE, AV_PIX_FMT_YUV420P16BE,
59 AV_PIX_FMT_YUV422P16LE, AV_PIX_FMT_YUV422P16BE,
60 AV_PIX_FMT_YUV444P16LE, AV_PIX_FMT_YUV444P16BE,
61 AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P,
62 AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P,
63 AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV440P,
64 AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P,
65 AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ440P,
67 AV_PIX_FMT_RGB8, AV_PIX_FMT_BGR8,
68 AV_PIX_FMT_RGB4_BYTE, AV_PIX_FMT_BGR4_BYTE,
69 AV_PIX_FMT_PAL8, AV_PIX_FMT_GRAY8,
73 ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
77 static int config_props(AVFilterLink *inlink)
79 FlipContext *flip = inlink->dst->priv;
80 const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format);
82 av_image_fill_max_pixsteps(flip->max_step, NULL, pix_desc);
83 flip->hsub = pix_desc->log2_chroma_w;
84 flip->vsub = pix_desc->log2_chroma_h;
89 static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *in)
91 AVFilterContext *ctx = inlink->dst;
92 FlipContext *flip = ctx->priv;
93 AVFilterLink *outlink = ctx->outputs[0];
94 AVFilterBufferRef *out;
95 uint8_t *inrow, *outrow;
96 int i, j, plane, step, hsub, vsub;
98 out = ff_get_video_buffer(outlink, AV_PERM_WRITE, outlink->w, outlink->h);
100 avfilter_unref_bufferp(&in);
101 return AVERROR(ENOMEM);
103 avfilter_copy_buffer_ref_props(out, in);
105 /* copy palette if required */
106 if (av_pix_fmt_desc_get(inlink->format)->flags & PIX_FMT_PAL)
107 memcpy(out->data[1], in->data[1], AVPALETTE_SIZE);
109 for (plane = 0; plane < 4 && in->data[plane]; plane++) {
110 step = flip->max_step[plane];
111 hsub = (plane == 1 || plane == 2) ? flip->hsub : 0;
112 vsub = (plane == 1 || plane == 2) ? flip->vsub : 0;
114 outrow = out->data[plane];
115 inrow = in ->data[plane] + ((inlink->w >> hsub) - 1) * step;
116 for (i = 0; i < in->video->h >> vsub; i++) {
119 for (j = 0; j < (inlink->w >> hsub); j++)
120 outrow[j] = inrow[-j];
125 uint16_t *outrow16 = (uint16_t *)outrow;
126 uint16_t * inrow16 = (uint16_t *) inrow;
127 for (j = 0; j < (inlink->w >> hsub); j++)
128 outrow16[j] = inrow16[-j];
135 uint8_t *out = outrow;
136 for (j = 0; j < (inlink->w >> hsub); j++, out += 3, in -= 3) {
137 int32_t v = AV_RB24(in);
145 uint32_t *outrow32 = (uint32_t *)outrow;
146 uint32_t * inrow32 = (uint32_t *) inrow;
147 for (j = 0; j < (inlink->w >> hsub); j++)
148 outrow32[j] = inrow32[-j];
153 for (j = 0; j < (inlink->w >> hsub); j++)
154 memcpy(outrow + j*step, inrow - j*step, step);
157 inrow += in ->linesize[plane];
158 outrow += out->linesize[plane];
162 avfilter_unref_bufferp(&in);
163 return ff_filter_frame(outlink, out);
166 static const AVFilterPad avfilter_vf_hflip_inputs[] = {
169 .type = AVMEDIA_TYPE_VIDEO,
170 .filter_frame = filter_frame,
171 .config_props = config_props,
172 .min_perms = AV_PERM_READ,
177 static const AVFilterPad avfilter_vf_hflip_outputs[] = {
180 .type = AVMEDIA_TYPE_VIDEO,
185 AVFilter avfilter_vf_hflip = {
187 .description = NULL_IF_CONFIG_SMALL("Horizontally flip the input video."),
188 .priv_size = sizeof(FlipContext),
189 .query_formats = query_formats,
191 .inputs = avfilter_vf_hflip_inputs,
192 .outputs = avfilter_vf_hflip_outputs,