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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 #include "libavutil/mathematics.h"
00034
00035 static const char *var_names[] = {
00036 "E",
00037 "PHI",
00038 "PI",
00039 "in_w", "iw",
00040 "in_h", "ih",
00041 "out_w", "ow",
00042 "out_h", "oh",
00043 "x",
00044 "y",
00045 "n",
00046 "pos",
00047 "t",
00048 NULL
00049 };
00050
00051 enum var_name {
00052 VAR_E,
00053 VAR_PHI,
00054 VAR_PI,
00055 VAR_IN_W, VAR_IW,
00056 VAR_IN_H, VAR_IH,
00057 VAR_OUT_W, VAR_OW,
00058 VAR_OUT_H, VAR_OH,
00059 VAR_X,
00060 VAR_Y,
00061 VAR_N,
00062 VAR_POS,
00063 VAR_T,
00064 VAR_VARS_NB
00065 };
00066
00067 typedef struct {
00068 int x;
00069 int y;
00070 int w;
00071 int h;
00072
00073 int max_step[4];
00074 int hsub, vsub;
00075 char x_expr[256], y_expr[256], ow_expr[256], oh_expr[256];
00076 AVExpr *x_pexpr, *y_pexpr;
00077 double var_values[VAR_VARS_NB];
00078 } CropContext;
00079
00080 static int query_formats(AVFilterContext *ctx)
00081 {
00082 static const enum PixelFormat pix_fmts[] = {
00083 PIX_FMT_RGB48BE, PIX_FMT_RGB48LE,
00084 PIX_FMT_BGR48BE, PIX_FMT_BGR48LE,
00085 PIX_FMT_ARGB, PIX_FMT_RGBA,
00086 PIX_FMT_ABGR, PIX_FMT_BGRA,
00087 PIX_FMT_RGB24, PIX_FMT_BGR24,
00088 PIX_FMT_RGB565BE, PIX_FMT_RGB565LE,
00089 PIX_FMT_RGB555BE, PIX_FMT_RGB555LE,
00090 PIX_FMT_BGR565BE, PIX_FMT_BGR565LE,
00091 PIX_FMT_BGR555BE, PIX_FMT_BGR555LE,
00092 PIX_FMT_GRAY16BE, PIX_FMT_GRAY16LE,
00093 PIX_FMT_YUV420P16LE, PIX_FMT_YUV420P16BE,
00094 PIX_FMT_YUV422P16LE, PIX_FMT_YUV422P16BE,
00095 PIX_FMT_YUV444P16LE, PIX_FMT_YUV444P16BE,
00096 PIX_FMT_YUV444P, PIX_FMT_YUV422P,
00097 PIX_FMT_YUV420P, PIX_FMT_YUV411P,
00098 PIX_FMT_YUV410P, PIX_FMT_YUV440P,
00099 PIX_FMT_YUVJ444P, PIX_FMT_YUVJ422P,
00100 PIX_FMT_YUVJ420P, PIX_FMT_YUVJ440P,
00101 PIX_FMT_YUVA420P,
00102 PIX_FMT_RGB8, PIX_FMT_BGR8,
00103 PIX_FMT_RGB4_BYTE, PIX_FMT_BGR4_BYTE,
00104 PIX_FMT_PAL8, PIX_FMT_GRAY8,
00105 PIX_FMT_NONE
00106 };
00107
00108 avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts));
00109
00110 return 0;
00111 }
00112
00113 static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
00114 {
00115 CropContext *crop = ctx->priv;
00116
00117 av_strlcpy(crop->ow_expr, "iw", sizeof(crop->ow_expr));
00118 av_strlcpy(crop->oh_expr, "ih", sizeof(crop->oh_expr));
00119 av_strlcpy(crop->x_expr, "(in_w-out_w)/2", sizeof(crop->x_expr));
00120 av_strlcpy(crop->y_expr, "(in_h-out_h)/2", sizeof(crop->y_expr));
00121
00122 if (args)
00123 sscanf(args, "%255[^:]:%255[^:]:%255[^:]:%255[^:]", crop->ow_expr, crop->oh_expr, crop->x_expr, crop->y_expr);
00124
00125 return 0;
00126 }
00127
00128 static av_cold void uninit(AVFilterContext *ctx)
00129 {
00130 CropContext *crop = ctx->priv;
00131
00132 av_expr_free(crop->x_pexpr); crop->x_pexpr = NULL;
00133 av_expr_free(crop->y_pexpr); crop->y_pexpr = NULL;
00134 }
00135
00136 static inline int normalize_double(int *n, double d)
00137 {
00138 int ret = 0;
00139
00140 if (isnan(d)) {
00141 ret = AVERROR(EINVAL);
00142 } else if (d > INT_MAX || d < INT_MIN) {
00143 *n = d > INT_MAX ? INT_MAX : INT_MIN;
00144 ret = AVERROR(EINVAL);
00145 } else
00146 *n = round(d);
00147
00148 return ret;
00149 }
00150
00151 static int config_input(AVFilterLink *link)
00152 {
00153 AVFilterContext *ctx = link->dst;
00154 CropContext *crop = ctx->priv;
00155 const AVPixFmtDescriptor *pix_desc = &av_pix_fmt_descriptors[link->format];
00156 int ret;
00157 const char *expr;
00158 double res;
00159
00160 crop->var_values[VAR_E] = M_E;
00161 crop->var_values[VAR_PHI] = M_PHI;
00162 crop->var_values[VAR_PI] = M_PI;
00163 crop->var_values[VAR_IN_W] = crop->var_values[VAR_IW] = ctx->inputs[0]->w;
00164 crop->var_values[VAR_IN_H] = crop->var_values[VAR_IH] = ctx->inputs[0]->h;
00165 crop->var_values[VAR_X] = NAN;
00166 crop->var_values[VAR_Y] = NAN;
00167 crop->var_values[VAR_OUT_W] = crop->var_values[VAR_OW] = NAN;
00168 crop->var_values[VAR_OUT_H] = crop->var_values[VAR_OH] = NAN;
00169 crop->var_values[VAR_N] = 0;
00170 crop->var_values[VAR_T] = NAN;
00171 crop->var_values[VAR_POS] = NAN;
00172
00173 av_image_fill_max_pixsteps(crop->max_step, NULL, pix_desc);
00174 crop->hsub = av_pix_fmt_descriptors[link->format].log2_chroma_w;
00175 crop->vsub = av_pix_fmt_descriptors[link->format].log2_chroma_h;
00176
00177 if ((ret = av_expr_parse_and_eval(&res, (expr = crop->ow_expr),
00178 var_names, crop->var_values,
00179 NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0) goto fail_expr;
00180 crop->var_values[VAR_OUT_W] = crop->var_values[VAR_OW] = res;
00181 if ((ret = av_expr_parse_and_eval(&res, (expr = crop->oh_expr),
00182 var_names, crop->var_values,
00183 NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0) goto fail_expr;
00184 crop->var_values[VAR_OUT_H] = crop->var_values[VAR_OH] = res;
00185
00186 if ((ret = av_expr_parse_and_eval(&res, (expr = crop->ow_expr),
00187 var_names, crop->var_values,
00188 NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0) goto fail_expr;
00189 crop->var_values[VAR_OUT_W] = crop->var_values[VAR_OW] = res;
00190 if (normalize_double(&crop->w, crop->var_values[VAR_OUT_W]) < 0 ||
00191 normalize_double(&crop->h, crop->var_values[VAR_OUT_H]) < 0) {
00192 av_log(ctx, AV_LOG_ERROR,
00193 "Too big value or invalid expression for out_w/ow or out_h/oh. "
00194 "Maybe the expression for out_w:'%s' or for out_h:'%s' is self-referencing.\n",
00195 crop->ow_expr, crop->oh_expr);
00196 return AVERROR(EINVAL);
00197 }
00198 crop->w &= ~((1 << crop->hsub) - 1);
00199 crop->h &= ~((1 << crop->vsub) - 1);
00200
00201 if ((ret = av_expr_parse(&crop->x_pexpr, crop->x_expr, var_names,
00202 NULL, NULL, NULL, NULL, 0, ctx)) < 0 ||
00203 (ret = av_expr_parse(&crop->y_pexpr, crop->y_expr, var_names,
00204 NULL, NULL, NULL, NULL, 0, ctx)) < 0)
00205 return AVERROR(EINVAL);
00206
00207 av_log(ctx, AV_LOG_INFO, "w:%d h:%d -> w:%d h:%d\n",
00208 link->w, link->h, crop->w, crop->h);
00209
00210 if (crop->w <= 0 || crop->h <= 0 ||
00211 crop->w > link->w || crop->h > link->h) {
00212 av_log(ctx, AV_LOG_ERROR,
00213 "Invalid too big or non positive size for width '%d' or height '%d'\n",
00214 crop->w, crop->h);
00215 return AVERROR(EINVAL);
00216 }
00217
00218
00219 crop->x = (link->w - crop->w) / 2;
00220 crop->y = (link->h - crop->h) / 2;
00221 crop->x &= ~((1 << crop->hsub) - 1);
00222 crop->y &= ~((1 << crop->vsub) - 1);
00223 return 0;
00224
00225 fail_expr:
00226 av_log(NULL, AV_LOG_ERROR, "Error when evaluating the expression '%s'\n", expr);
00227 return ret;
00228 }
00229
00230 static int config_output(AVFilterLink *link)
00231 {
00232 CropContext *crop = link->src->priv;
00233
00234 link->w = crop->w;
00235 link->h = crop->h;
00236
00237 return 0;
00238 }
00239
00240 static void start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
00241 {
00242 AVFilterContext *ctx = link->dst;
00243 CropContext *crop = ctx->priv;
00244 AVFilterBufferRef *ref2;
00245 int i;
00246
00247 ref2 = avfilter_ref_buffer(picref, ~0);
00248 ref2->video->w = crop->w;
00249 ref2->video->h = crop->h;
00250
00251 crop->var_values[VAR_T] = picref->pts == AV_NOPTS_VALUE ?
00252 NAN : picref->pts * av_q2d(link->time_base);
00253 crop->var_values[VAR_POS] = picref->pos == -1 ? NAN : picref->pos;
00254 crop->var_values[VAR_X] = av_expr_eval(crop->x_pexpr, crop->var_values, NULL);
00255 crop->var_values[VAR_Y] = av_expr_eval(crop->y_pexpr, crop->var_values, NULL);
00256 crop->var_values[VAR_X] = av_expr_eval(crop->x_pexpr, crop->var_values, NULL);
00257
00258 normalize_double(&crop->x, crop->var_values[VAR_X]);
00259 normalize_double(&crop->y, crop->var_values[VAR_Y]);
00260
00261 if (crop->x < 0) crop->x = 0;
00262 if (crop->y < 0) crop->y = 0;
00263 if ((unsigned)crop->x + (unsigned)crop->w > link->w) crop->x = link->w - crop->w;
00264 if ((unsigned)crop->y + (unsigned)crop->h > link->h) crop->y = link->h - crop->h;
00265 crop->x &= ~((1 << crop->hsub) - 1);
00266 crop->y &= ~((1 << crop->vsub) - 1);
00267
00268 av_dlog(ctx, "n:%d t:%f x:%d y:%d x+w:%d y+h:%d\n",
00269 (int)crop->var_values[VAR_N], crop->var_values[VAR_T], crop->x,
00270 crop->y, crop->x+crop->w, crop->y+crop->h);
00271
00272 ref2->data[0] += crop->y * ref2->linesize[0];
00273 ref2->data[0] += crop->x * crop->max_step[0];
00274
00275 if (!(av_pix_fmt_descriptors[link->format].flags & PIX_FMT_PAL)) {
00276 for (i = 1; i < 3; i ++) {
00277 if (ref2->data[i]) {
00278 ref2->data[i] += (crop->y >> crop->vsub) * ref2->linesize[i];
00279 ref2->data[i] += (crop->x * crop->max_step[i]) >> crop->hsub;
00280 }
00281 }
00282 }
00283
00284
00285 if (ref2->data[3]) {
00286 ref2->data[3] += crop->y * ref2->linesize[3];
00287 ref2->data[3] += crop->x * crop->max_step[3];
00288 }
00289
00290 avfilter_start_frame(link->dst->outputs[0], ref2);
00291 }
00292
00293 static void draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
00294 {
00295 AVFilterContext *ctx = link->dst;
00296 CropContext *crop = ctx->priv;
00297
00298 if (y >= crop->y + crop->h || y + h <= crop->y)
00299 return;
00300
00301 if (y < crop->y) {
00302 h -= crop->y - y;
00303 y = crop->y;
00304 }
00305 if (y + h > crop->y + crop->h)
00306 h = crop->y + crop->h - y;
00307
00308 avfilter_draw_slice(ctx->outputs[0], y - crop->y, h, slice_dir);
00309 }
00310
00311 static void end_frame(AVFilterLink *link)
00312 {
00313 CropContext *crop = link->dst->priv;
00314
00315 crop->var_values[VAR_N] += 1.0;
00316 avfilter_unref_buffer(link->cur_buf);
00317 avfilter_end_frame(link->dst->outputs[0]);
00318 }
00319
00320 AVFilter avfilter_vf_crop = {
00321 .name = "crop",
00322 .description = NULL_IF_CONFIG_SMALL("Crop the input video to width:height:x:y."),
00323
00324 .priv_size = sizeof(CropContext),
00325
00326 .query_formats = query_formats,
00327 .init = init,
00328 .uninit = uninit,
00329
00330 .inputs = (AVFilterPad[]) {{ .name = "default",
00331 .type = AVMEDIA_TYPE_VIDEO,
00332 .start_frame = start_frame,
00333 .draw_slice = draw_slice,
00334 .end_frame = end_frame,
00335 .get_video_buffer = avfilter_null_get_video_buffer,
00336 .config_props = config_input, },
00337 { .name = NULL}},
00338 .outputs = (AVFilterPad[]) {{ .name = "default",
00339 .type = AVMEDIA_TYPE_VIDEO,
00340 .config_props = config_output, },
00341 { .name = NULL}},
00342 };