| 1 | /* |
| 2 | * Copyright (c) 2013 Paul B Mahol |
| 3 | * |
| 4 | * This file is part of FFmpeg. |
| 5 | * |
| 6 | * FFmpeg is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU Lesser General Public |
| 8 | * License as published by the Free Software Foundation; either |
| 9 | * version 2.1 of the License, or (at your option) any later version. |
| 10 | * |
| 11 | * FFmpeg is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | * Lesser General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU Lesser General Public |
| 17 | * License along with FFmpeg; if not, write to the Free Software |
| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 19 | */ |
| 20 | |
| 21 | #include "libavutil/eval.h" |
| 22 | #include "libavutil/opt.h" |
| 23 | #include "libavutil/pixdesc.h" |
| 24 | #include "avfilter.h" |
| 25 | #include "formats.h" |
| 26 | #include "internal.h" |
| 27 | #include "video.h" |
| 28 | #include "libswscale/swscale.h" |
| 29 | |
| 30 | static const char *const var_names[] = { |
| 31 | "in_w", "iw", |
| 32 | "in_h", "ih", |
| 33 | "out_w", "ow", |
| 34 | "out_h", "oh", |
| 35 | "in", |
| 36 | "on", |
| 37 | "duration", |
| 38 | "pduration", |
| 39 | "time", |
| 40 | "frame", |
| 41 | "zoom", |
| 42 | "pzoom", |
| 43 | "x", "px", |
| 44 | "y", "py", |
| 45 | "a", |
| 46 | "sar", |
| 47 | "dar", |
| 48 | "hsub", |
| 49 | "vsub", |
| 50 | NULL |
| 51 | }; |
| 52 | |
| 53 | enum var_name { |
| 54 | VAR_IN_W, VAR_IW, |
| 55 | VAR_IN_H, VAR_IH, |
| 56 | VAR_OUT_W, VAR_OW, |
| 57 | VAR_OUT_H, VAR_OH, |
| 58 | VAR_IN, |
| 59 | VAR_ON, |
| 60 | VAR_DURATION, |
| 61 | VAR_PDURATION, |
| 62 | VAR_TIME, |
| 63 | VAR_FRAME, |
| 64 | VAR_ZOOM, |
| 65 | VAR_PZOOM, |
| 66 | VAR_X, VAR_PX, |
| 67 | VAR_Y, VAR_PY, |
| 68 | VAR_A, |
| 69 | VAR_SAR, |
| 70 | VAR_DAR, |
| 71 | VAR_HSUB, |
| 72 | VAR_VSUB, |
| 73 | VARS_NB |
| 74 | }; |
| 75 | |
| 76 | typedef struct ZPcontext { |
| 77 | const AVClass *class; |
| 78 | char *zoom_expr_str; |
| 79 | char *x_expr_str; |
| 80 | char *y_expr_str; |
| 81 | char *duration_expr_str; |
| 82 | int w, h; |
| 83 | double x, y; |
| 84 | double prev_zoom; |
| 85 | int prev_nb_frames; |
| 86 | struct SwsContext *sws; |
| 87 | int64_t frame_count; |
| 88 | } ZPContext; |
| 89 | |
| 90 | #define OFFSET(x) offsetof(ZPContext, x) |
| 91 | #define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM |
| 92 | static const AVOption zoompan_options[] = { |
| 93 | { "zoom", "set the zoom expression", OFFSET(zoom_expr_str), AV_OPT_TYPE_STRING, {.str = "1" }, .flags = FLAGS }, |
| 94 | { "z", "set the zoom expression", OFFSET(zoom_expr_str), AV_OPT_TYPE_STRING, {.str = "1" }, .flags = FLAGS }, |
| 95 | { "x", "set the x expression", OFFSET(x_expr_str), AV_OPT_TYPE_STRING, {.str="0"}, .flags = FLAGS }, |
| 96 | { "y", "set the y expression", OFFSET(y_expr_str), AV_OPT_TYPE_STRING, {.str="0"}, .flags = FLAGS }, |
| 97 | { "d", "set the duration expression", OFFSET(duration_expr_str), AV_OPT_TYPE_STRING, {.str="90"}, .flags = FLAGS }, |
| 98 | { "s", "set the output image size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str="hd720"}, .flags = FLAGS }, |
| 99 | { NULL } |
| 100 | }; |
| 101 | |
| 102 | AVFILTER_DEFINE_CLASS(zoompan); |
| 103 | |
| 104 | static av_cold int init(AVFilterContext *ctx) |
| 105 | { |
| 106 | ZPContext *s = ctx->priv; |
| 107 | |
| 108 | s->prev_zoom = 1; |
| 109 | return 0; |
| 110 | } |
| 111 | |
| 112 | static int config_output(AVFilterLink *outlink) |
| 113 | { |
| 114 | AVFilterContext *ctx = outlink->src; |
| 115 | ZPContext *s = ctx->priv; |
| 116 | |
| 117 | outlink->w = s->w; |
| 118 | outlink->h = s->h; |
| 119 | |
| 120 | return 0; |
| 121 | } |
| 122 | |
| 123 | static int filter_frame(AVFilterLink *inlink, AVFrame *in) |
| 124 | { |
| 125 | AVFilterContext *ctx = inlink->dst; |
| 126 | AVFilterLink *outlink = ctx->outputs[0]; |
| 127 | ZPContext *s = ctx->priv; |
| 128 | double var_values[VARS_NB], nb_frames, zoom, dx, dy; |
| 129 | const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(in->format); |
| 130 | AVFrame *out; |
| 131 | int i, k, x, y, w, h, ret = 0; |
| 132 | |
| 133 | var_values[VAR_IN_W] = var_values[VAR_IW] = in->width; |
| 134 | var_values[VAR_IN_H] = var_values[VAR_IH] = in->height; |
| 135 | var_values[VAR_OUT_W] = var_values[VAR_OW] = s->w; |
| 136 | var_values[VAR_OUT_H] = var_values[VAR_OH] = s->h; |
| 137 | var_values[VAR_IN] = inlink->frame_count + 1; |
| 138 | var_values[VAR_ON] = outlink->frame_count + 1; |
| 139 | var_values[VAR_PX] = s->x; |
| 140 | var_values[VAR_PY] = s->y; |
| 141 | var_values[VAR_X] = 0; |
| 142 | var_values[VAR_Y] = 0; |
| 143 | var_values[VAR_PZOOM] = s->prev_zoom; |
| 144 | var_values[VAR_ZOOM] = 1; |
| 145 | var_values[VAR_PDURATION] = s->prev_nb_frames; |
| 146 | var_values[VAR_A] = (double) in->width / in->height; |
| 147 | var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ? |
| 148 | (double) inlink->sample_aspect_ratio.num / inlink->sample_aspect_ratio.den : 1; |
| 149 | var_values[VAR_DAR] = var_values[VAR_A] * var_values[VAR_SAR]; |
| 150 | var_values[VAR_HSUB] = 1 << desc->log2_chroma_w; |
| 151 | var_values[VAR_VSUB] = 1 << desc->log2_chroma_h; |
| 152 | |
| 153 | if ((ret = av_expr_parse_and_eval(&nb_frames, s->duration_expr_str, |
| 154 | var_names, var_values, |
| 155 | NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0) |
| 156 | goto fail; |
| 157 | |
| 158 | var_values[VAR_DURATION] = nb_frames; |
| 159 | for (i = 0; i < nb_frames; i++) { |
| 160 | int px[4]; |
| 161 | int py[4]; |
| 162 | uint8_t *input[4]; |
| 163 | int64_t pts = av_rescale_q(in->pts, inlink->time_base, |
| 164 | outlink->time_base) + s->frame_count; |
| 165 | |
| 166 | var_values[VAR_TIME] = pts * av_q2d(outlink->time_base); |
| 167 | var_values[VAR_FRAME] = i; |
| 168 | var_values[VAR_ON] = outlink->frame_count + 1; |
| 169 | if ((ret = av_expr_parse_and_eval(&zoom, s->zoom_expr_str, |
| 170 | var_names, var_values, |
| 171 | NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0) |
| 172 | goto fail; |
| 173 | |
| 174 | zoom = av_clipd(zoom, 1, 10); |
| 175 | var_values[VAR_ZOOM] = zoom; |
| 176 | w = in->width * (1.0 / zoom); |
| 177 | h = in->height * (1.0 / zoom); |
| 178 | |
| 179 | if ((ret = av_expr_parse_and_eval(&dx, s->x_expr_str, |
| 180 | var_names, var_values, |
| 181 | NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0) |
| 182 | goto fail; |
| 183 | x = dx = av_clipd(dx, 0, FFMAX(in->width - w, 0)); |
| 184 | var_values[VAR_X] = dx; |
| 185 | x &= ~((1 << desc->log2_chroma_w) - 1); |
| 186 | |
| 187 | if ((ret = av_expr_parse_and_eval(&dy, s->y_expr_str, |
| 188 | var_names, var_values, |
| 189 | NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0) |
| 190 | goto fail; |
| 191 | y = dy = av_clipd(dy, 0, FFMAX(in->height - h, 0)); |
| 192 | var_values[VAR_Y] = dy; |
| 193 | y &= ~((1 << desc->log2_chroma_h) - 1); |
| 194 | |
| 195 | out = ff_get_video_buffer(outlink, outlink->w, outlink->h); |
| 196 | if (!out) { |
| 197 | ret = AVERROR(ENOMEM); |
| 198 | goto fail; |
| 199 | } |
| 200 | |
| 201 | px[1] = px[2] = FF_CEIL_RSHIFT(x, desc->log2_chroma_w); |
| 202 | px[0] = px[3] = x; |
| 203 | |
| 204 | py[1] = py[2] = FF_CEIL_RSHIFT(y, desc->log2_chroma_h); |
| 205 | py[0] = py[3] = y; |
| 206 | |
| 207 | s->sws = sws_alloc_context(); |
| 208 | if (!s->sws) { |
| 209 | ret = AVERROR(ENOMEM); |
| 210 | goto fail; |
| 211 | } |
| 212 | |
| 213 | for (k = 0; in->data[k]; k++) |
| 214 | input[k] = in->data[k] + py[k] * in->linesize[k] + px[k]; |
| 215 | |
| 216 | av_opt_set_int(s->sws, "srcw", w, 0); |
| 217 | av_opt_set_int(s->sws, "srch", h, 0); |
| 218 | av_opt_set_int(s->sws, "src_format", in->format, 0); |
| 219 | av_opt_set_int(s->sws, "dstw", outlink->w, 0); |
| 220 | av_opt_set_int(s->sws, "dsth", outlink->h, 0); |
| 221 | av_opt_set_int(s->sws, "dst_format", outlink->format, 0); |
| 222 | av_opt_set_int(s->sws, "sws_flags", SWS_BICUBIC, 0); |
| 223 | |
| 224 | if ((ret = sws_init_context(s->sws, NULL, NULL)) < 0) |
| 225 | goto fail; |
| 226 | |
| 227 | sws_scale(s->sws, (const uint8_t *const *)&input, in->linesize, 0, h, out->data, out->linesize); |
| 228 | |
| 229 | out->pts = pts; |
| 230 | s->frame_count++; |
| 231 | |
| 232 | ret = ff_filter_frame(outlink, out); |
| 233 | if (ret < 0) |
| 234 | break; |
| 235 | |
| 236 | sws_freeContext(s->sws); |
| 237 | s->sws = NULL; |
| 238 | } |
| 239 | |
| 240 | s->x = dx; |
| 241 | s->y = dy; |
| 242 | s->prev_zoom = zoom; |
| 243 | s->prev_nb_frames = nb_frames; |
| 244 | |
| 245 | fail: |
| 246 | sws_freeContext(s->sws); |
| 247 | s->sws = NULL; |
| 248 | av_frame_free(&in); |
| 249 | return ret; |
| 250 | } |
| 251 | |
| 252 | static int query_formats(AVFilterContext *ctx) |
| 253 | { |
| 254 | static const enum AVPixelFormat pix_fmts[] = { |
| 255 | AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P, |
| 256 | AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P, |
| 257 | AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV440P, |
| 258 | AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA422P, |
| 259 | AV_PIX_FMT_YUVA420P, |
| 260 | AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P, |
| 261 | AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P, |
| 262 | AV_PIX_FMT_YUVJ411P, |
| 263 | AV_PIX_FMT_GRAY8, |
| 264 | AV_PIX_FMT_NONE |
| 265 | }; |
| 266 | |
| 267 | |
| 268 | ff_set_common_formats(ctx, ff_make_format_list(pix_fmts)); |
| 269 | return 0; |
| 270 | } |
| 271 | |
| 272 | static av_cold void uninit(AVFilterContext *ctx) |
| 273 | { |
| 274 | ZPContext *s = ctx->priv; |
| 275 | |
| 276 | sws_freeContext(s->sws); |
| 277 | s->sws = NULL; |
| 278 | } |
| 279 | |
| 280 | static const AVFilterPad inputs[] = { |
| 281 | { |
| 282 | .name = "default", |
| 283 | .type = AVMEDIA_TYPE_VIDEO, |
| 284 | .filter_frame = filter_frame, |
| 285 | }, |
| 286 | { NULL } |
| 287 | }; |
| 288 | |
| 289 | static const AVFilterPad outputs[] = { |
| 290 | { |
| 291 | .name = "default", |
| 292 | .type = AVMEDIA_TYPE_VIDEO, |
| 293 | .config_props = config_output, |
| 294 | }, |
| 295 | { NULL } |
| 296 | }; |
| 297 | |
| 298 | AVFilter ff_vf_zoompan = { |
| 299 | .name = "zoompan", |
| 300 | .description = NULL_IF_CONFIG_SMALL("Apply Zoom & Pan effect."), |
| 301 | .priv_size = sizeof(ZPContext), |
| 302 | .priv_class = &zoompan_class, |
| 303 | .init = init, |
| 304 | .uninit = uninit, |
| 305 | .query_formats = query_formats, |
| 306 | .inputs = inputs, |
| 307 | .outputs = outputs, |
| 308 | .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, |
| 309 | }; |