3 * copyright (c) 2007 Bobby Bingham
5 * This file is part of FFmpeg.
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.
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.
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
22 #include "libavcodec/imgconvert.h"
25 unsigned avfilter_version(void) {
26 return LIBAVFILTER_VERSION_INT;
29 /** list of registered filters */
33 struct FilterList *next;
36 /** helper macros to get the in/out pad on the dst/src filter */
37 #define link_dpad(link) link->dst-> input_pads[link->dstpad]
38 #define link_spad(link) link->src->output_pads[link->srcpad]
40 AVFilterPicRef *avfilter_ref_pic(AVFilterPicRef *ref, int pmask)
42 AVFilterPicRef *ret = av_malloc(sizeof(AVFilterPicRef));
45 ret->pic->refcount ++;
49 void avfilter_unref_pic(AVFilterPicRef *ref)
51 if(!(--ref->pic->refcount))
52 ref->pic->free(ref->pic);
56 void avfilter_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
57 AVFilterPad **pads, AVFilterLink ***links,
62 idx = FFMIN(idx, *count);
64 *pads = av_realloc(*pads, sizeof(AVFilterPad) * (*count + 1));
65 *links = av_realloc(*links, sizeof(AVFilterLink*) * (*count + 1));
66 memmove(*pads +idx+1, *pads +idx, sizeof(AVFilterPad) * (*count-idx));
67 memmove(*links+idx+1, *links+idx, sizeof(AVFilterLink*) * (*count-idx));
68 memcpy(*pads+idx, newpad, sizeof(AVFilterPad));
72 for(i = idx+1; i < *count; i ++)
74 (*(unsigned *)((uint8_t *) *links[i] + padidx_off)) ++;
77 int avfilter_link(AVFilterContext *src, unsigned srcpad,
78 AVFilterContext *dst, unsigned dstpad)
82 if(src->output_count <= srcpad || dst->input_count <= dstpad ||
83 src->outputs[srcpad] || dst->inputs[dstpad])
86 src->outputs[srcpad] =
87 dst-> inputs[dstpad] = link = av_mallocz(sizeof(AVFilterLink));
91 link->srcpad = srcpad;
92 link->dstpad = dstpad;
93 link->format = PIX_FMT_NONE;
98 int avfilter_insert_filter(AVFilterLink *link, AVFilterContext *filt,
99 unsigned in, unsigned out)
101 av_log(link->dst, AV_LOG_INFO, "auto-inserting filter '%s'\n",
104 link->dst->inputs[link->dstpad] = NULL;
105 if(avfilter_link(filt, out, link->dst, link->dstpad)) {
106 /* failed to link output filter to new filter */
107 link->dst->inputs[link->dstpad] = link;
111 /* re-hookup the link to the new destination filter we inserted */
114 filt->inputs[in] = link;
116 /* if any information on supported colorspaces already exists on the
117 * link, we need to preserve that */
118 if(link->out_formats)
119 avfilter_formats_changeref(&link->out_formats,
120 &filt->outputs[out]->out_formats);
125 int avfilter_config_links(AVFilterContext *filter)
127 int (*config_link)(AVFilterLink *);
130 for(i = 0; i < filter->input_count; i ++) {
131 AVFilterLink *link = filter->inputs[i];
135 switch(link->init_state) {
138 case AVLINK_STARTINIT:
139 av_log(filter, AV_LOG_INFO, "circular filter chain detected\n");
142 link->init_state = AVLINK_STARTINIT;
144 if(avfilter_config_links(link->src))
147 if(!(config_link = link_spad(link).config_props))
148 config_link = avfilter_default_config_output_link;
149 if(config_link(link))
152 if((config_link = link_dpad(link).config_props))
153 if(config_link(link))
156 link->init_state = AVLINK_INIT;
163 AVFilterPicRef *avfilter_get_video_buffer(AVFilterLink *link, int perms)
165 AVFilterPicRef *ret = NULL;
167 if(link_dpad(link).get_video_buffer)
168 ret = link_dpad(link).get_video_buffer(link, perms);
171 ret = avfilter_default_get_video_buffer(link, perms);
176 int avfilter_request_frame(AVFilterLink *link)
178 if(link_spad(link).request_frame)
179 return link_spad(link).request_frame(link);
180 else if(link->src->inputs[0])
181 return avfilter_request_frame(link->src->inputs[0]);
185 int avfilter_poll_frame(AVFilterLink *link)
189 if(link_spad(link).poll_frame)
190 return link_spad(link).poll_frame(link);
192 for (i=0; i<link->src->input_count; i++) {
193 if(!link->src->inputs[i])
195 min = FFMIN(min, avfilter_poll_frame(link->src->inputs[i]));
201 /* XXX: should we do the duplicating of the picture ref here, instead of
202 * forcing the source filter to do it? */
203 void avfilter_start_frame(AVFilterLink *link, AVFilterPicRef *picref)
205 void (*start_frame)(AVFilterLink *, AVFilterPicRef *);
206 AVFilterPad *dst = &link_dpad(link);
208 if(!(start_frame = dst->start_frame))
209 start_frame = avfilter_default_start_frame;
211 /* prepare to copy the picture if it has insufficient permissions */
212 if((dst->min_perms & picref->perms) != dst->min_perms ||
213 dst->rej_perms & picref->perms) {
215 av_log(link->dst, AV_LOG_INFO,
216 "frame copy needed (have perms %x, need %x, reject %x)\n",
218 link_dpad(link).min_perms, link_dpad(link).rej_perms);
221 link->cur_pic = avfilter_default_get_video_buffer(link, dst->min_perms);
222 link->srcpic = picref;
223 link->cur_pic->pts = link->srcpic->pts;
226 link->cur_pic = picref;
228 start_frame(link, link->cur_pic);
231 void avfilter_end_frame(AVFilterLink *link)
233 void (*end_frame)(AVFilterLink *);
235 if(!(end_frame = link_dpad(link).end_frame))
236 end_frame = avfilter_default_end_frame;
240 /* unreference the source picture if we're feeding the destination filter
241 * a copied version dues to permission issues */
243 avfilter_unref_pic(link->srcpic);
249 void avfilter_draw_slice(AVFilterLink *link, int y, int h)
251 uint8_t *src[4], *dst[4];
252 int i, j, hsub, vsub;
253 void (*draw_slice)(AVFilterLink *, int, int);
255 /* copy the slice if needed for permission reasons */
257 avcodec_get_chroma_sub_sample(link->format, &hsub, &vsub);
259 for(i = 0; i < 4; i ++) {
260 if(link->srcpic->data[i]) {
261 src[i] = link->srcpic-> data[i] +
262 (y >> (i==0 ? 0 : vsub)) * link->srcpic-> linesize[i];
263 dst[i] = link->cur_pic->data[i] +
264 (y >> (i==0 ? 0 : vsub)) * link->cur_pic->linesize[i];
266 src[i] = dst[i] = NULL;
269 for(i = 0; i < 4; i ++) {
271 ff_get_plane_bytewidth(link->format, link->cur_pic->w, i);
273 if(!src[i]) continue;
275 for(j = 0; j < h >> (i==0 ? 0 : vsub); j ++) {
276 memcpy(dst[i], src[i], planew);
277 src[i] += link->srcpic ->linesize[i];
278 dst[i] += link->cur_pic->linesize[i];
283 if(!(draw_slice = link_dpad(link).draw_slice))
284 draw_slice = avfilter_default_draw_slice;
285 draw_slice(link, y, h);
288 AVFilter *avfilter_get_by_name(const char *name)
290 struct FilterList *filt;
292 for(filt = filters; filt; filt = filt->next)
293 if(!strcmp(filt->filter->name, name))
299 void avfilter_register(AVFilter *filter)
301 struct FilterList *newfilt = av_malloc(sizeof(struct FilterList));
303 newfilt->filter = filter;
304 newfilt->next = filters;
308 void avfilter_uninit(void)
310 struct FilterList *tmp;
312 for(; filters; filters = tmp) {
318 static int pad_count(const AVFilterPad *pads)
322 for(count = 0; pads->name; count ++) pads ++;
326 static const char *filter_name(void *p)
328 AVFilterContext *filter = p;
329 return filter->filter->name;
332 static const AVClass avfilter_class = {
337 AVFilterContext *avfilter_open(AVFilter *filter, const char *inst_name)
339 AVFilterContext *ret;
344 ret = av_mallocz(sizeof(AVFilterContext));
346 ret->av_class = &avfilter_class;
347 ret->filter = filter;
348 ret->name = inst_name ? av_strdup(inst_name) : NULL;
349 ret->priv = av_mallocz(filter->priv_size);
351 ret->input_count = pad_count(filter->inputs);
352 if (ret->input_count) {
353 ret->input_pads = av_malloc(sizeof(AVFilterPad) * ret->input_count);
354 memcpy(ret->input_pads, filter->inputs, sizeof(AVFilterPad)*ret->input_count);
355 ret->inputs = av_mallocz(sizeof(AVFilterLink*) * ret->input_count);
358 ret->output_count = pad_count(filter->outputs);
359 if (ret->output_count) {
360 ret->output_pads = av_malloc(sizeof(AVFilterPad) * ret->output_count);
361 memcpy(ret->output_pads, filter->outputs, sizeof(AVFilterPad)*ret->output_count);
362 ret->outputs = av_mallocz(sizeof(AVFilterLink*) * ret->output_count);
368 void avfilter_destroy(AVFilterContext *filter)
372 if(filter->filter->uninit)
373 filter->filter->uninit(filter);
375 for(i = 0; i < filter->input_count; i ++) {
376 if(filter->inputs[i])
377 filter->inputs[i]->src->outputs[filter->inputs[i]->srcpad] = NULL;
378 av_freep(&filter->inputs[i]);
380 for(i = 0; i < filter->output_count; i ++) {
381 if(filter->outputs[i])
382 filter->outputs[i]->dst->inputs[filter->outputs[i]->dstpad] = NULL;
383 av_freep(&filter->outputs[i]);
386 av_freep(&filter->name);
387 av_freep(&filter->input_pads);
388 av_freep(&filter->output_pads);
389 av_freep(&filter->inputs);
390 av_freep(&filter->outputs);
391 av_freep(&filter->priv);
395 int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque)
399 if(filter->filter->init)
400 ret = filter->filter->init(filter, args, opaque);