Libav 0.7.1
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00001 /* 00002 * Copyright (c) 2007 Bobby Bingham 00003 * 00004 * This file is part of Libav. 00005 * 00006 * Libav is free software; you can redistribute it and/or 00007 * modify it under the terms of the GNU Lesser General Public 00008 * License as published by the Free Software Foundation; either 00009 * version 2.1 of the License, or (at your option) any later version. 00010 * 00011 * Libav is distributed in the hope that it will be useful, 00012 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00013 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00014 * Lesser General Public License for more details. 00015 * 00016 * You should have received a copy of the GNU Lesser General Public 00017 * License along with Libav; if not, write to the Free Software 00018 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00019 */ 00020 00026 /* #define DEBUG */ 00027 00028 #include "avfilter.h" 00029 #include "libavutil/eval.h" 00030 #include "libavutil/avstring.h" 00031 #include "libavutil/libm.h" 00032 #include "libavutil/imgutils.h" 00033 00034 static const char *var_names[] = { 00035 "E", 00036 "PHI", 00037 "PI", 00038 "in_w", "iw", 00039 "in_h", "ih", 00040 "out_w", "ow", 00041 "out_h", "oh", 00042 "x", 00043 "y", 00044 "n", 00045 "pos", 00046 "t", 00047 NULL 00048 }; 00049 00050 enum var_name { 00051 VAR_E, 00052 VAR_PHI, 00053 VAR_PI, 00054 VAR_IN_W, VAR_IW, 00055 VAR_IN_H, VAR_IH, 00056 VAR_OUT_W, VAR_OW, 00057 VAR_OUT_H, VAR_OH, 00058 VAR_X, 00059 VAR_Y, 00060 VAR_N, 00061 VAR_POS, 00062 VAR_T, 00063 VAR_VARS_NB 00064 }; 00065 00066 typedef struct { 00067 int x; 00068 int y; 00069 int w; 00070 int h; 00071 00072 int max_step[4]; 00073 int hsub, vsub; 00074 char x_expr[256], y_expr[256], ow_expr[256], oh_expr[256]; 00075 AVExpr *x_pexpr, *y_pexpr; /* parsed expressions for x and y */ 00076 double var_values[VAR_VARS_NB]; 00077 } CropContext; 00078 00079 static int query_formats(AVFilterContext *ctx) 00080 { 00081 static const enum PixelFormat pix_fmts[] = { 00082 PIX_FMT_RGB48BE, PIX_FMT_RGB48LE, 00083 PIX_FMT_BGR48BE, PIX_FMT_BGR48LE, 00084 PIX_FMT_ARGB, PIX_FMT_RGBA, 00085 PIX_FMT_ABGR, PIX_FMT_BGRA, 00086 PIX_FMT_RGB24, PIX_FMT_BGR24, 00087 PIX_FMT_RGB565BE, PIX_FMT_RGB565LE, 00088 PIX_FMT_RGB555BE, PIX_FMT_RGB555LE, 00089 PIX_FMT_BGR565BE, PIX_FMT_BGR565LE, 00090 PIX_FMT_BGR555BE, PIX_FMT_BGR555LE, 00091 PIX_FMT_GRAY16BE, PIX_FMT_GRAY16LE, 00092 PIX_FMT_YUV420P16LE, PIX_FMT_YUV420P16BE, 00093 PIX_FMT_YUV422P16LE, PIX_FMT_YUV422P16BE, 00094 PIX_FMT_YUV444P16LE, PIX_FMT_YUV444P16BE, 00095 PIX_FMT_YUV444P, PIX_FMT_YUV422P, 00096 PIX_FMT_YUV420P, PIX_FMT_YUV411P, 00097 PIX_FMT_YUV410P, PIX_FMT_YUV440P, 00098 PIX_FMT_YUVJ444P, PIX_FMT_YUVJ422P, 00099 PIX_FMT_YUVJ420P, PIX_FMT_YUVJ440P, 00100 PIX_FMT_YUVA420P, 00101 PIX_FMT_RGB8, PIX_FMT_BGR8, 00102 PIX_FMT_RGB4_BYTE, PIX_FMT_BGR4_BYTE, 00103 PIX_FMT_PAL8, PIX_FMT_GRAY8, 00104 PIX_FMT_NONE 00105 }; 00106 00107 avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts)); 00108 00109 return 0; 00110 } 00111 00112 static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque) 00113 { 00114 CropContext *crop = ctx->priv; 00115 00116 av_strlcpy(crop->ow_expr, "iw", sizeof(crop->ow_expr)); 00117 av_strlcpy(crop->oh_expr, "ih", sizeof(crop->oh_expr)); 00118 av_strlcpy(crop->x_expr, "(in_w-out_w)/2", sizeof(crop->x_expr)); 00119 av_strlcpy(crop->y_expr, "(in_h-out_h)/2", sizeof(crop->y_expr)); 00120 00121 if (args) 00122 sscanf(args, "%255[^:]:%255[^:]:%255[^:]:%255[^:]", crop->ow_expr, crop->oh_expr, crop->x_expr, crop->y_expr); 00123 00124 return 0; 00125 } 00126 00127 static av_cold void uninit(AVFilterContext *ctx) 00128 { 00129 CropContext *crop = ctx->priv; 00130 00131 av_expr_free(crop->x_pexpr); crop->x_pexpr = NULL; 00132 av_expr_free(crop->y_pexpr); crop->y_pexpr = NULL; 00133 } 00134 00135 static inline int normalize_double(int *n, double d) 00136 { 00137 int ret = 0; 00138 00139 if (isnan(d)) { 00140 ret = AVERROR(EINVAL); 00141 } else if (d > INT_MAX || d < INT_MIN) { 00142 *n = d > INT_MAX ? INT_MAX : INT_MIN; 00143 ret = AVERROR(EINVAL); 00144 } else 00145 *n = round(d); 00146 00147 return ret; 00148 } 00149 00150 static int config_input(AVFilterLink *link) 00151 { 00152 AVFilterContext *ctx = link->dst; 00153 CropContext *crop = ctx->priv; 00154 const AVPixFmtDescriptor *pix_desc = &av_pix_fmt_descriptors[link->format]; 00155 int ret; 00156 const char *expr; 00157 double res; 00158 00159 crop->var_values[VAR_E] = M_E; 00160 crop->var_values[VAR_PHI] = M_PHI; 00161 crop->var_values[VAR_PI] = M_PI; 00162 crop->var_values[VAR_IN_W] = crop->var_values[VAR_IW] = ctx->inputs[0]->w; 00163 crop->var_values[VAR_IN_H] = crop->var_values[VAR_IH] = ctx->inputs[0]->h; 00164 crop->var_values[VAR_X] = NAN; 00165 crop->var_values[VAR_Y] = NAN; 00166 crop->var_values[VAR_OUT_W] = crop->var_values[VAR_OW] = NAN; 00167 crop->var_values[VAR_OUT_H] = crop->var_values[VAR_OH] = NAN; 00168 crop->var_values[VAR_N] = 0; 00169 crop->var_values[VAR_T] = NAN; 00170 crop->var_values[VAR_POS] = NAN; 00171 00172 av_image_fill_max_pixsteps(crop->max_step, NULL, pix_desc); 00173 crop->hsub = av_pix_fmt_descriptors[link->format].log2_chroma_w; 00174 crop->vsub = av_pix_fmt_descriptors[link->format].log2_chroma_h; 00175 00176 if ((ret = av_expr_parse_and_eval(&res, (expr = crop->ow_expr), 00177 var_names, crop->var_values, 00178 NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0) goto fail_expr; 00179 crop->var_values[VAR_OUT_W] = crop->var_values[VAR_OW] = res; 00180 if ((ret = av_expr_parse_and_eval(&res, (expr = crop->oh_expr), 00181 var_names, crop->var_values, 00182 NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0) goto fail_expr; 00183 crop->var_values[VAR_OUT_H] = crop->var_values[VAR_OH] = res; 00184 /* evaluate again ow as it may depend on oh */ 00185 if ((ret = av_expr_parse_and_eval(&res, (expr = crop->ow_expr), 00186 var_names, crop->var_values, 00187 NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0) goto fail_expr; 00188 crop->var_values[VAR_OUT_W] = crop->var_values[VAR_OW] = res; 00189 if (normalize_double(&crop->w, crop->var_values[VAR_OUT_W]) < 0 || 00190 normalize_double(&crop->h, crop->var_values[VAR_OUT_H]) < 0) { 00191 av_log(ctx, AV_LOG_ERROR, 00192 "Too big value or invalid expression for out_w/ow or out_h/oh. " 00193 "Maybe the expression for out_w:'%s' or for out_h:'%s' is self-referencing.\n", 00194 crop->ow_expr, crop->oh_expr); 00195 return AVERROR(EINVAL); 00196 } 00197 crop->w &= ~((1 << crop->hsub) - 1); 00198 crop->h &= ~((1 << crop->vsub) - 1); 00199 00200 if ((ret = av_expr_parse(&crop->x_pexpr, crop->x_expr, var_names, 00201 NULL, NULL, NULL, NULL, 0, ctx)) < 0 || 00202 (ret = av_expr_parse(&crop->y_pexpr, crop->y_expr, var_names, 00203 NULL, NULL, NULL, NULL, 0, ctx)) < 0) 00204 return AVERROR(EINVAL); 00205 00206 av_log(ctx, AV_LOG_INFO, "w:%d h:%d -> w:%d h:%d\n", 00207 link->w, link->h, crop->w, crop->h); 00208 00209 if (crop->w <= 0 || crop->h <= 0 || 00210 crop->w > link->w || crop->h > link->h) { 00211 av_log(ctx, AV_LOG_ERROR, 00212 "Invalid too big or non positive size for width '%d' or height '%d'\n", 00213 crop->w, crop->h); 00214 return AVERROR(EINVAL); 00215 } 00216 00217 /* set default, required in the case the first computed value for x/y is NAN */ 00218 crop->x = (link->w - crop->w) / 2; 00219 crop->y = (link->h - crop->h) / 2; 00220 crop->x &= ~((1 << crop->hsub) - 1); 00221 crop->y &= ~((1 << crop->vsub) - 1); 00222 return 0; 00223 00224 fail_expr: 00225 av_log(NULL, AV_LOG_ERROR, "Error when evaluating the expression '%s'\n", expr); 00226 return ret; 00227 } 00228 00229 static int config_output(AVFilterLink *link) 00230 { 00231 CropContext *crop = link->src->priv; 00232 00233 link->w = crop->w; 00234 link->h = crop->h; 00235 00236 return 0; 00237 } 00238 00239 static void start_frame(AVFilterLink *link, AVFilterBufferRef *picref) 00240 { 00241 AVFilterContext *ctx = link->dst; 00242 CropContext *crop = ctx->priv; 00243 AVFilterBufferRef *ref2; 00244 int i; 00245 00246 ref2 = avfilter_ref_buffer(picref, ~0); 00247 ref2->video->w = crop->w; 00248 ref2->video->h = crop->h; 00249 00250 crop->var_values[VAR_T] = picref->pts == AV_NOPTS_VALUE ? 00251 NAN : picref->pts * av_q2d(link->time_base); 00252 crop->var_values[VAR_POS] = picref->pos == -1 ? NAN : picref->pos; 00253 crop->var_values[VAR_X] = av_expr_eval(crop->x_pexpr, crop->var_values, NULL); 00254 crop->var_values[VAR_Y] = av_expr_eval(crop->y_pexpr, crop->var_values, NULL); 00255 crop->var_values[VAR_X] = av_expr_eval(crop->x_pexpr, crop->var_values, NULL); 00256 00257 normalize_double(&crop->x, crop->var_values[VAR_X]); 00258 normalize_double(&crop->y, crop->var_values[VAR_Y]); 00259 00260 if (crop->x < 0) crop->x = 0; 00261 if (crop->y < 0) crop->y = 0; 00262 if ((unsigned)crop->x + (unsigned)crop->w > link->w) crop->x = link->w - crop->w; 00263 if ((unsigned)crop->y + (unsigned)crop->h > link->h) crop->y = link->h - crop->h; 00264 crop->x &= ~((1 << crop->hsub) - 1); 00265 crop->y &= ~((1 << crop->vsub) - 1); 00266 00267 av_dlog(ctx, "n:%d t:%f x:%d y:%d x+w:%d y+h:%d\n", 00268 (int)crop->var_values[VAR_N], crop->var_values[VAR_T], crop->x, 00269 crop->y, crop->x+crop->w, crop->y+crop->h); 00270 00271 ref2->data[0] += crop->y * ref2->linesize[0]; 00272 ref2->data[0] += crop->x * crop->max_step[0]; 00273 00274 if (!(av_pix_fmt_descriptors[link->format].flags & PIX_FMT_PAL)) { 00275 for (i = 1; i < 3; i ++) { 00276 if (ref2->data[i]) { 00277 ref2->data[i] += (crop->y >> crop->vsub) * ref2->linesize[i]; 00278 ref2->data[i] += (crop->x * crop->max_step[i]) >> crop->hsub; 00279 } 00280 } 00281 } 00282 00283 /* alpha plane */ 00284 if (ref2->data[3]) { 00285 ref2->data[3] += crop->y * ref2->linesize[3]; 00286 ref2->data[3] += crop->x * crop->max_step[3]; 00287 } 00288 00289 avfilter_start_frame(link->dst->outputs[0], ref2); 00290 } 00291 00292 static void draw_slice(AVFilterLink *link, int y, int h, int slice_dir) 00293 { 00294 AVFilterContext *ctx = link->dst; 00295 CropContext *crop = ctx->priv; 00296 00297 if (y >= crop->y + crop->h || y + h <= crop->y) 00298 return; 00299 00300 if (y < crop->y) { 00301 h -= crop->y - y; 00302 y = crop->y; 00303 } 00304 if (y + h > crop->y + crop->h) 00305 h = crop->y + crop->h - y; 00306 00307 avfilter_draw_slice(ctx->outputs[0], y - crop->y, h, slice_dir); 00308 } 00309 00310 static void end_frame(AVFilterLink *link) 00311 { 00312 CropContext *crop = link->dst->priv; 00313 00314 crop->var_values[VAR_N] += 1.0; 00315 avfilter_unref_buffer(link->cur_buf); 00316 avfilter_end_frame(link->dst->outputs[0]); 00317 } 00318 00319 AVFilter avfilter_vf_crop = { 00320 .name = "crop", 00321 .description = NULL_IF_CONFIG_SMALL("Crop the input video to width:height:x:y."), 00322 00323 .priv_size = sizeof(CropContext), 00324 00325 .query_formats = query_formats, 00326 .init = init, 00327 .uninit = uninit, 00328 00329 .inputs = (AVFilterPad[]) {{ .name = "default", 00330 .type = AVMEDIA_TYPE_VIDEO, 00331 .start_frame = start_frame, 00332 .draw_slice = draw_slice, 00333 .end_frame = end_frame, 00334 .get_video_buffer = avfilter_null_get_video_buffer, 00335 .config_props = config_input, }, 00336 { .name = NULL}}, 00337 .outputs = (AVFilterPad[]) {{ .name = "default", 00338 .type = AVMEDIA_TYPE_VIDEO, 00339 .config_props = config_output, }, 00340 { .name = NULL}}, 00341 };