| 1 | /* |
| 2 | * Copyright (c) 2007 Benoit Fouet |
| 3 | * Copyright (c) 2010 Stefano Sabatini |
| 4 | * |
| 5 | * This file is part of FFmpeg. |
| 6 | * |
| 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. |
| 11 | * |
| 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. |
| 16 | * |
| 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 |
| 20 | */ |
| 21 | |
| 22 | /** |
| 23 | * @file |
| 24 | * horizontal flip filter |
| 25 | */ |
| 26 | |
| 27 | #include <string.h> |
| 28 | |
| 29 | #include "avfilter.h" |
| 30 | #include "formats.h" |
| 31 | #include "internal.h" |
| 32 | #include "video.h" |
| 33 | #include "libavutil/pixdesc.h" |
| 34 | #include "libavutil/internal.h" |
| 35 | #include "libavutil/intreadwrite.h" |
| 36 | #include "libavutil/imgutils.h" |
| 37 | |
| 38 | typedef struct FlipContext { |
| 39 | int max_step[4]; ///< max pixel step for each plane, expressed as a number of bytes |
| 40 | int planewidth[4]; ///< width of each plane |
| 41 | int planeheight[4]; ///< height of each plane |
| 42 | } FlipContext; |
| 43 | |
| 44 | static int query_formats(AVFilterContext *ctx) |
| 45 | { |
| 46 | AVFilterFormats *pix_fmts = NULL; |
| 47 | int fmt; |
| 48 | |
| 49 | for (fmt = 0; av_pix_fmt_desc_get(fmt); fmt++) { |
| 50 | const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt); |
| 51 | if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL || |
| 52 | desc->flags & AV_PIX_FMT_FLAG_BITSTREAM || |
| 53 | (desc->log2_chroma_w != desc->log2_chroma_h && |
| 54 | desc->comp[0].plane == desc->comp[1].plane))) |
| 55 | ff_add_format(&pix_fmts, fmt); |
| 56 | } |
| 57 | |
| 58 | ff_set_common_formats(ctx, pix_fmts); |
| 59 | return 0; |
| 60 | } |
| 61 | |
| 62 | static int config_props(AVFilterLink *inlink) |
| 63 | { |
| 64 | FlipContext *s = inlink->dst->priv; |
| 65 | const AVPixFmtDescriptor *pix_desc = av_pix_fmt_desc_get(inlink->format); |
| 66 | const int hsub = pix_desc->log2_chroma_w; |
| 67 | const int vsub = pix_desc->log2_chroma_h; |
| 68 | |
| 69 | av_image_fill_max_pixsteps(s->max_step, NULL, pix_desc); |
| 70 | s->planewidth[0] = s->planewidth[3] = inlink->w; |
| 71 | s->planewidth[1] = s->planewidth[2] = FF_CEIL_RSHIFT(inlink->w, hsub); |
| 72 | s->planeheight[0] = s->planeheight[3] = inlink->h; |
| 73 | s->planeheight[1] = s->planeheight[2] = FF_CEIL_RSHIFT(inlink->h, vsub); |
| 74 | |
| 75 | return 0; |
| 76 | } |
| 77 | |
| 78 | typedef struct ThreadData { |
| 79 | AVFrame *in, *out; |
| 80 | } ThreadData; |
| 81 | |
| 82 | static int filter_slice(AVFilterContext *ctx, void *arg, int job, int nb_jobs) |
| 83 | { |
| 84 | FlipContext *s = ctx->priv; |
| 85 | ThreadData *td = arg; |
| 86 | AVFrame *in = td->in; |
| 87 | AVFrame *out = td->out; |
| 88 | uint8_t *inrow, *outrow; |
| 89 | int i, j, plane, step; |
| 90 | |
| 91 | for (plane = 0; plane < 4 && in->data[plane] && in->linesize[plane]; plane++) { |
| 92 | const int width = s->planewidth[plane]; |
| 93 | const int height = s->planeheight[plane]; |
| 94 | const int start = (height * job ) / nb_jobs; |
| 95 | const int end = (height * (job+1)) / nb_jobs; |
| 96 | |
| 97 | step = s->max_step[plane]; |
| 98 | |
| 99 | outrow = out->data[plane] + start * out->linesize[plane]; |
| 100 | inrow = in ->data[plane] + start * in->linesize[plane] + (width - 1) * step; |
| 101 | for (i = start; i < end; i++) { |
| 102 | switch (step) { |
| 103 | case 1: |
| 104 | for (j = 0; j < width; j++) |
| 105 | outrow[j] = inrow[-j]; |
| 106 | break; |
| 107 | |
| 108 | case 2: |
| 109 | { |
| 110 | uint16_t *outrow16 = (uint16_t *)outrow; |
| 111 | uint16_t * inrow16 = (uint16_t *) inrow; |
| 112 | for (j = 0; j < width; j++) |
| 113 | outrow16[j] = inrow16[-j]; |
| 114 | } |
| 115 | break; |
| 116 | |
| 117 | case 3: |
| 118 | { |
| 119 | uint8_t *in = inrow; |
| 120 | uint8_t *out = outrow; |
| 121 | for (j = 0; j < width; j++, out += 3, in -= 3) { |
| 122 | int32_t v = AV_RB24(in); |
| 123 | AV_WB24(out, v); |
| 124 | } |
| 125 | } |
| 126 | break; |
| 127 | |
| 128 | case 4: |
| 129 | { |
| 130 | uint32_t *outrow32 = (uint32_t *)outrow; |
| 131 | uint32_t * inrow32 = (uint32_t *) inrow; |
| 132 | for (j = 0; j < width; j++) |
| 133 | outrow32[j] = inrow32[-j]; |
| 134 | } |
| 135 | break; |
| 136 | |
| 137 | default: |
| 138 | for (j = 0; j < width; j++) |
| 139 | memcpy(outrow + j*step, inrow - j*step, step); |
| 140 | } |
| 141 | |
| 142 | inrow += in ->linesize[plane]; |
| 143 | outrow += out->linesize[plane]; |
| 144 | } |
| 145 | } |
| 146 | |
| 147 | return 0; |
| 148 | } |
| 149 | |
| 150 | static int filter_frame(AVFilterLink *inlink, AVFrame *in) |
| 151 | { |
| 152 | AVFilterContext *ctx = inlink->dst; |
| 153 | AVFilterLink *outlink = ctx->outputs[0]; |
| 154 | ThreadData td; |
| 155 | AVFrame *out; |
| 156 | |
| 157 | out = ff_get_video_buffer(outlink, outlink->w, outlink->h); |
| 158 | if (!out) { |
| 159 | av_frame_free(&in); |
| 160 | return AVERROR(ENOMEM); |
| 161 | } |
| 162 | av_frame_copy_props(out, in); |
| 163 | |
| 164 | /* copy palette if required */ |
| 165 | if (av_pix_fmt_desc_get(inlink->format)->flags & AV_PIX_FMT_FLAG_PAL) |
| 166 | memcpy(out->data[1], in->data[1], AVPALETTE_SIZE); |
| 167 | |
| 168 | td.in = in, td.out = out; |
| 169 | ctx->internal->execute(ctx, filter_slice, &td, NULL, FFMIN(outlink->h, ctx->graph->nb_threads)); |
| 170 | |
| 171 | av_frame_free(&in); |
| 172 | return ff_filter_frame(outlink, out); |
| 173 | } |
| 174 | |
| 175 | static const AVFilterPad avfilter_vf_hflip_inputs[] = { |
| 176 | { |
| 177 | .name = "default", |
| 178 | .type = AVMEDIA_TYPE_VIDEO, |
| 179 | .filter_frame = filter_frame, |
| 180 | .config_props = config_props, |
| 181 | }, |
| 182 | { NULL } |
| 183 | }; |
| 184 | |
| 185 | static const AVFilterPad avfilter_vf_hflip_outputs[] = { |
| 186 | { |
| 187 | .name = "default", |
| 188 | .type = AVMEDIA_TYPE_VIDEO, |
| 189 | }, |
| 190 | { NULL } |
| 191 | }; |
| 192 | |
| 193 | AVFilter ff_vf_hflip = { |
| 194 | .name = "hflip", |
| 195 | .description = NULL_IF_CONFIG_SMALL("Horizontally flip the input video."), |
| 196 | .priv_size = sizeof(FlipContext), |
| 197 | .query_formats = query_formats, |
| 198 | .inputs = avfilter_vf_hflip_inputs, |
| 199 | .outputs = avfilter_vf_hflip_outputs, |
| 200 | .flags = AVFILTER_FLAG_SLICE_THREADS, |
| 201 | }; |