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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 * const var_names[] = {
00036 "in_w", "iw",
00037 "in_h", "ih",
00038 "out_w", "ow",
00039 "out_h", "oh",
00040 "a",
00041 "sar",
00042 "dar",
00043 "hsub",
00044 "vsub",
00045 "x",
00046 "y",
00047 "n",
00048 "pos",
00049 "t",
00050 NULL
00051 };
00052
00053 enum var_name {
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_A,
00059 VAR_SAR,
00060 VAR_DAR,
00061 VAR_HSUB,
00062 VAR_VSUB,
00063 VAR_X,
00064 VAR_Y,
00065 VAR_N,
00066 VAR_POS,
00067 VAR_T,
00068 VAR_VARS_NB
00069 };
00070
00071 typedef struct {
00072 int x;
00073 int y;
00074 int w;
00075 int h;
00076
00077 int max_step[4];
00078 int hsub, vsub;
00079 char x_expr[256], y_expr[256], ow_expr[256], oh_expr[256];
00080 AVExpr *x_pexpr, *y_pexpr;
00081 double var_values[VAR_VARS_NB];
00082 } CropContext;
00083
00084 static int query_formats(AVFilterContext *ctx)
00085 {
00086 static const enum PixelFormat pix_fmts[] = {
00087 PIX_FMT_RGB48BE, PIX_FMT_RGB48LE,
00088 PIX_FMT_BGR48BE, PIX_FMT_BGR48LE,
00089 PIX_FMT_ARGB, PIX_FMT_RGBA,
00090 PIX_FMT_ABGR, PIX_FMT_BGRA,
00091 PIX_FMT_RGB24, PIX_FMT_BGR24,
00092 PIX_FMT_RGB565BE, PIX_FMT_RGB565LE,
00093 PIX_FMT_RGB555BE, PIX_FMT_RGB555LE,
00094 PIX_FMT_BGR565BE, PIX_FMT_BGR565LE,
00095 PIX_FMT_BGR555BE, PIX_FMT_BGR555LE,
00096 PIX_FMT_GRAY16BE, PIX_FMT_GRAY16LE,
00097 PIX_FMT_YUV420P16LE, PIX_FMT_YUV420P16BE,
00098 PIX_FMT_YUV422P16LE, PIX_FMT_YUV422P16BE,
00099 PIX_FMT_YUV444P16LE, PIX_FMT_YUV444P16BE,
00100 PIX_FMT_YUV444P, PIX_FMT_YUV422P,
00101 PIX_FMT_YUV420P, PIX_FMT_YUV411P,
00102 PIX_FMT_YUV410P, PIX_FMT_YUV440P,
00103 PIX_FMT_YUVJ444P, PIX_FMT_YUVJ422P,
00104 PIX_FMT_YUVJ420P, PIX_FMT_YUVJ440P,
00105 PIX_FMT_YUVA420P,
00106 PIX_FMT_RGB8, PIX_FMT_BGR8,
00107 PIX_FMT_RGB4_BYTE, PIX_FMT_BGR4_BYTE,
00108 PIX_FMT_PAL8, PIX_FMT_GRAY8,
00109 PIX_FMT_NONE
00110 };
00111
00112 avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));
00113
00114 return 0;
00115 }
00116
00117 static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
00118 {
00119 CropContext *crop = ctx->priv;
00120
00121 av_strlcpy(crop->ow_expr, "iw", sizeof(crop->ow_expr));
00122 av_strlcpy(crop->oh_expr, "ih", sizeof(crop->oh_expr));
00123 av_strlcpy(crop->x_expr, "(in_w-out_w)/2", sizeof(crop->x_expr));
00124 av_strlcpy(crop->y_expr, "(in_h-out_h)/2", sizeof(crop->y_expr));
00125
00126 if (args)
00127 sscanf(args, "%255[^:]:%255[^:]:%255[^:]:%255[^:]", crop->ow_expr, crop->oh_expr, crop->x_expr, crop->y_expr);
00128
00129 return 0;
00130 }
00131
00132 static av_cold void uninit(AVFilterContext *ctx)
00133 {
00134 CropContext *crop = ctx->priv;
00135
00136 av_expr_free(crop->x_pexpr); crop->x_pexpr = NULL;
00137 av_expr_free(crop->y_pexpr); crop->y_pexpr = NULL;
00138 }
00139
00140 static inline int normalize_double(int *n, double d)
00141 {
00142 int ret = 0;
00143
00144 if (isnan(d)) {
00145 ret = AVERROR(EINVAL);
00146 } else if (d > INT_MAX || d < INT_MIN) {
00147 *n = d > INT_MAX ? INT_MAX : INT_MIN;
00148 ret = AVERROR(EINVAL);
00149 } else
00150 *n = round(d);
00151
00152 return ret;
00153 }
00154
00155 static int config_input(AVFilterLink *link)
00156 {
00157 AVFilterContext *ctx = link->dst;
00158 CropContext *crop = ctx->priv;
00159 const AVPixFmtDescriptor *pix_desc = &av_pix_fmt_descriptors[link->format];
00160 int ret;
00161 const char *expr;
00162 double res;
00163
00164 crop->var_values[VAR_IN_W] = crop->var_values[VAR_IW] = ctx->inputs[0]->w;
00165 crop->var_values[VAR_IN_H] = crop->var_values[VAR_IH] = ctx->inputs[0]->h;
00166 crop->var_values[VAR_A] = (float) link->w / link->h;
00167 crop->var_values[VAR_SAR] = link->sample_aspect_ratio.num ? av_q2d(link->sample_aspect_ratio) : 1;
00168 crop->var_values[VAR_DAR] = crop->var_values[VAR_A] * crop->var_values[VAR_SAR];
00169 crop->var_values[VAR_HSUB] = 1<<pix_desc->log2_chroma_w;
00170 crop->var_values[VAR_VSUB] = 1<<pix_desc->log2_chroma_h;
00171 crop->var_values[VAR_X] = NAN;
00172 crop->var_values[VAR_Y] = NAN;
00173 crop->var_values[VAR_OUT_W] = crop->var_values[VAR_OW] = NAN;
00174 crop->var_values[VAR_OUT_H] = crop->var_values[VAR_OH] = NAN;
00175 crop->var_values[VAR_N] = 0;
00176 crop->var_values[VAR_T] = NAN;
00177 crop->var_values[VAR_POS] = NAN;
00178
00179 av_image_fill_max_pixsteps(crop->max_step, NULL, pix_desc);
00180 crop->hsub = av_pix_fmt_descriptors[link->format].log2_chroma_w;
00181 crop->vsub = av_pix_fmt_descriptors[link->format].log2_chroma_h;
00182
00183 if ((ret = av_expr_parse_and_eval(&res, (expr = crop->ow_expr),
00184 var_names, crop->var_values,
00185 NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0) goto fail_expr;
00186 crop->var_values[VAR_OUT_W] = crop->var_values[VAR_OW] = res;
00187 if ((ret = av_expr_parse_and_eval(&res, (expr = crop->oh_expr),
00188 var_names, crop->var_values,
00189 NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0) goto fail_expr;
00190 crop->var_values[VAR_OUT_H] = crop->var_values[VAR_OH] = res;
00191
00192 if ((ret = av_expr_parse_and_eval(&res, (expr = crop->ow_expr),
00193 var_names, crop->var_values,
00194 NULL, NULL, NULL, NULL, NULL, 0, ctx)) < 0) goto fail_expr;
00195 crop->var_values[VAR_OUT_W] = crop->var_values[VAR_OW] = res;
00196 if (normalize_double(&crop->w, crop->var_values[VAR_OUT_W]) < 0 ||
00197 normalize_double(&crop->h, crop->var_values[VAR_OUT_H]) < 0) {
00198 av_log(ctx, AV_LOG_ERROR,
00199 "Too big value or invalid expression for out_w/ow or out_h/oh. "
00200 "Maybe the expression for out_w:'%s' or for out_h:'%s' is self-referencing.\n",
00201 crop->ow_expr, crop->oh_expr);
00202 return AVERROR(EINVAL);
00203 }
00204 crop->w &= ~((1 << crop->hsub) - 1);
00205 crop->h &= ~((1 << crop->vsub) - 1);
00206
00207 if ((ret = av_expr_parse(&crop->x_pexpr, crop->x_expr, var_names,
00208 NULL, NULL, NULL, NULL, 0, ctx)) < 0 ||
00209 (ret = av_expr_parse(&crop->y_pexpr, crop->y_expr, var_names,
00210 NULL, NULL, NULL, NULL, 0, ctx)) < 0)
00211 return AVERROR(EINVAL);
00212
00213 av_log(ctx, AV_LOG_INFO, "w:%d h:%d -> w:%d h:%d\n",
00214 link->w, link->h, crop->w, crop->h);
00215
00216 if (crop->w <= 0 || crop->h <= 0 ||
00217 crop->w > link->w || crop->h > link->h) {
00218 av_log(ctx, AV_LOG_ERROR,
00219 "Invalid too big or non positive size for width '%d' or height '%d'\n",
00220 crop->w, crop->h);
00221 return AVERROR(EINVAL);
00222 }
00223
00224
00225 crop->x = (link->w - crop->w) / 2;
00226 crop->y = (link->h - crop->h) / 2;
00227 crop->x &= ~((1 << crop->hsub) - 1);
00228 crop->y &= ~((1 << crop->vsub) - 1);
00229 return 0;
00230
00231 fail_expr:
00232 av_log(NULL, AV_LOG_ERROR, "Error when evaluating the expression '%s'\n", expr);
00233 return ret;
00234 }
00235
00236 static int config_output(AVFilterLink *link)
00237 {
00238 CropContext *crop = link->src->priv;
00239
00240 link->w = crop->w;
00241 link->h = crop->h;
00242
00243 return 0;
00244 }
00245
00246 static void start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
00247 {
00248 AVFilterContext *ctx = link->dst;
00249 CropContext *crop = ctx->priv;
00250 AVFilterBufferRef *ref2;
00251 int i;
00252
00253 ref2 = avfilter_ref_buffer(picref, ~0);
00254 ref2->video->w = crop->w;
00255 ref2->video->h = crop->h;
00256
00257 crop->var_values[VAR_T] = picref->pts == AV_NOPTS_VALUE ?
00258 NAN : picref->pts * av_q2d(link->time_base);
00259 crop->var_values[VAR_POS] = picref->pos == -1 ? NAN : picref->pos;
00260 crop->var_values[VAR_X] = av_expr_eval(crop->x_pexpr, crop->var_values, NULL);
00261 crop->var_values[VAR_Y] = av_expr_eval(crop->y_pexpr, crop->var_values, NULL);
00262 crop->var_values[VAR_X] = av_expr_eval(crop->x_pexpr, crop->var_values, NULL);
00263
00264 normalize_double(&crop->x, crop->var_values[VAR_X]);
00265 normalize_double(&crop->y, crop->var_values[VAR_Y]);
00266
00267 if (crop->x < 0) crop->x = 0;
00268 if (crop->y < 0) crop->y = 0;
00269 if ((unsigned)crop->x + (unsigned)crop->w > link->w) crop->x = link->w - crop->w;
00270 if ((unsigned)crop->y + (unsigned)crop->h > link->h) crop->y = link->h - crop->h;
00271 crop->x &= ~((1 << crop->hsub) - 1);
00272 crop->y &= ~((1 << crop->vsub) - 1);
00273
00274 av_dlog(ctx, "n:%d t:%f x:%d y:%d x+w:%d y+h:%d\n",
00275 (int)crop->var_values[VAR_N], crop->var_values[VAR_T], crop->x,
00276 crop->y, crop->x+crop->w, crop->y+crop->h);
00277
00278 ref2->data[0] += crop->y * ref2->linesize[0];
00279 ref2->data[0] += crop->x * crop->max_step[0];
00280
00281 if (!(av_pix_fmt_descriptors[link->format].flags & PIX_FMT_PAL)) {
00282 for (i = 1; i < 3; i ++) {
00283 if (ref2->data[i]) {
00284 ref2->data[i] += (crop->y >> crop->vsub) * ref2->linesize[i];
00285 ref2->data[i] += (crop->x * crop->max_step[i]) >> crop->hsub;
00286 }
00287 }
00288 }
00289
00290
00291 if (ref2->data[3]) {
00292 ref2->data[3] += crop->y * ref2->linesize[3];
00293 ref2->data[3] += crop->x * crop->max_step[3];
00294 }
00295
00296 avfilter_start_frame(link->dst->outputs[0], ref2);
00297 }
00298
00299 static void draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
00300 {
00301 AVFilterContext *ctx = link->dst;
00302 CropContext *crop = ctx->priv;
00303
00304 if (y >= crop->y + crop->h || y + h <= crop->y)
00305 return;
00306
00307 if (y < crop->y) {
00308 h -= crop->y - y;
00309 y = crop->y;
00310 }
00311 if (y + h > crop->y + crop->h)
00312 h = crop->y + crop->h - y;
00313
00314 avfilter_draw_slice(ctx->outputs[0], y - crop->y, h, slice_dir);
00315 }
00316
00317 static void end_frame(AVFilterLink *link)
00318 {
00319 CropContext *crop = link->dst->priv;
00320
00321 crop->var_values[VAR_N] += 1.0;
00322 avfilter_unref_buffer(link->cur_buf);
00323 avfilter_end_frame(link->dst->outputs[0]);
00324 }
00325
00326 AVFilter avfilter_vf_crop = {
00327 .name = "crop",
00328 .description = NULL_IF_CONFIG_SMALL("Crop the input video to width:height:x:y."),
00329
00330 .priv_size = sizeof(CropContext),
00331
00332 .query_formats = query_formats,
00333 .init = init,
00334 .uninit = uninit,
00335
00336 .inputs = (const AVFilterPad[]) {{ .name = "default",
00337 .type = AVMEDIA_TYPE_VIDEO,
00338 .start_frame = start_frame,
00339 .draw_slice = draw_slice,
00340 .end_frame = end_frame,
00341 .get_video_buffer = avfilter_null_get_video_buffer,
00342 .config_props = config_input, },
00343 { .name = NULL}},
00344 .outputs = (const AVFilterPad[]) {{ .name = "default",
00345 .type = AVMEDIA_TYPE_VIDEO,
00346 .config_props = config_output, },
00347 { .name = NULL}},
00348 };
