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
24 #include "libavcodec/imgconvert.h"
27 unsigned avfilter_version(void) {
28 return LIBAVFILTER_VERSION_INT;
31 /** list of registered filters */
32 static struct FilterList
35 struct FilterList *next;
38 /** helper macros to get the in/out pad on the dst/src filter */
39 #define link_dpad(link) link->dst-> input_pads[link->dstpad]
40 #define link_spad(link) link->src->output_pads[link->srcpad]
42 AVFilterPicRef *avfilter_ref_pic(AVFilterPicRef *ref, int pmask)
44 AVFilterPicRef *ret = av_malloc(sizeof(AVFilterPicRef));
47 ret->pic->refcount ++;
51 void avfilter_unref_pic(AVFilterPicRef *ref)
53 if(!(--ref->pic->refcount))
54 ref->pic->free(ref->pic);
58 void avfilter_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
59 AVFilterPad **pads, AVFilterLink ***links,
64 idx = FFMIN(idx, *count);
66 *pads = av_realloc(*pads, sizeof(AVFilterPad) * (*count + 1));
67 *links = av_realloc(*links, sizeof(AVFilterLink*) * (*count + 1));
68 memmove(*pads +idx+1, *pads +idx, sizeof(AVFilterPad) * (*count-idx));
69 memmove(*links+idx+1, *links+idx, sizeof(AVFilterLink*) * (*count-idx));
70 memcpy(*pads+idx, newpad, sizeof(AVFilterPad));
74 for(i = idx+1; i < *count; i ++)
76 (*(unsigned *)((uint8_t *) *links[i] + padidx_off)) ++;
79 int avfilter_link(AVFilterContext *src, unsigned srcpad,
80 AVFilterContext *dst, unsigned dstpad)
84 if(src->output_count <= srcpad || dst->input_count <= dstpad ||
85 src->outputs[srcpad] || dst->inputs[dstpad])
88 src->outputs[srcpad] =
89 dst-> inputs[dstpad] = link = av_mallocz(sizeof(AVFilterLink));
93 link->srcpad = srcpad;
94 link->dstpad = dstpad;
95 link->format = PIX_FMT_NONE;
100 int avfilter_insert_filter(AVFilterLink *link, AVFilterContext *filt,
101 unsigned in, unsigned out)
103 av_log(link->dst, AV_LOG_INFO, "auto-inserting filter '%s'\n",
106 link->dst->inputs[link->dstpad] = NULL;
107 if(avfilter_link(filt, out, link->dst, link->dstpad)) {
108 /* failed to link output filter to new filter */
109 link->dst->inputs[link->dstpad] = link;
113 /* re-hookup the link to the new destination filter we inserted */
116 filt->inputs[in] = link;
118 /* if any information on supported colorspaces already exists on the
119 * link, we need to preserve that */
120 if(link->out_formats)
121 avfilter_formats_changeref(&link->out_formats,
122 &filt->outputs[out]->out_formats);
127 int avfilter_config_links(AVFilterContext *filter)
129 int (*config_link)(AVFilterLink *);
132 for(i = 0; i < filter->input_count; i ++) {
133 AVFilterLink *link = filter->inputs[i];
137 switch(link->init_state) {
140 case AVLINK_STARTINIT:
141 av_log(filter, AV_LOG_INFO, "circular filter chain detected\n");
144 link->init_state = AVLINK_STARTINIT;
146 if(avfilter_config_links(link->src))
149 if(!(config_link = link_spad(link).config_props))
150 config_link = avfilter_default_config_output_link;
151 if(config_link(link))
154 if((config_link = link_dpad(link).config_props))
155 if(config_link(link))
158 link->init_state = AVLINK_INIT;
165 static void dprintf_picref(void *ctx, AVFilterPicRef *picref, int end)
168 "picref[%p data[%p, %p, %p, %p] linesize[%d, %d, %d, %d] pts:%"PRId64" s:%dx%d]%s",
170 picref->data [0], picref->data [1], picref->data [2], picref->data [3],
171 picref->linesize[0], picref->linesize[1], picref->linesize[2], picref->linesize[3],
172 picref->pts, picref->w, picref->h,
176 static void dprintf_link(void *ctx, AVFilterLink *link, int end)
179 "link[%p s:%dx%d %-16s->%-16s]%s",
180 link, link->w, link->h,
181 link->src ? link->src->filter->name : "",
182 link->dst ? link->dst->filter->name : "",
186 #define DPRINTF_START(ctx, func) dprintf(NULL, "%-16s: ", #func)
188 AVFilterPicRef *avfilter_get_video_buffer(AVFilterLink *link, int perms)
190 AVFilterPicRef *ret = NULL;
192 DPRINTF_START(NULL, get_video_buffer); dprintf_link(NULL, link, 0); dprintf(NULL, " perms:%d\n", perms);
194 if(link_dpad(link).get_video_buffer)
195 ret = link_dpad(link).get_video_buffer(link, perms);
198 ret = avfilter_default_get_video_buffer(link, perms);
200 DPRINTF_START(NULL, get_video_buffer); dprintf_link(NULL, link, 0); dprintf(NULL, " returning "); dprintf_picref(NULL, ret, 1);
205 int avfilter_request_frame(AVFilterLink *link)
207 DPRINTF_START(NULL, request_frame); dprintf_link(NULL, link, 1);
209 if(link_spad(link).request_frame)
210 return link_spad(link).request_frame(link);
211 else if(link->src->inputs[0])
212 return avfilter_request_frame(link->src->inputs[0]);
216 int avfilter_poll_frame(AVFilterLink *link)
220 if(link_spad(link).poll_frame)
221 return link_spad(link).poll_frame(link);
223 for (i=0; i<link->src->input_count; i++) {
224 if(!link->src->inputs[i])
226 min = FFMIN(min, avfilter_poll_frame(link->src->inputs[i]));
232 /* XXX: should we do the duplicating of the picture ref here, instead of
233 * forcing the source filter to do it? */
234 void avfilter_start_frame(AVFilterLink *link, AVFilterPicRef *picref)
236 void (*start_frame)(AVFilterLink *, AVFilterPicRef *);
237 AVFilterPad *dst = &link_dpad(link);
239 DPRINTF_START(NULL, start_frame); dprintf_link(NULL, link, 0); dprintf(NULL, " "); dprintf_picref(NULL, picref, 1);
241 if(!(start_frame = dst->start_frame))
242 start_frame = avfilter_default_start_frame;
244 /* prepare to copy the picture if it has insufficient permissions */
245 if((dst->min_perms & picref->perms) != dst->min_perms ||
246 dst->rej_perms & picref->perms) {
248 av_log(link->dst, AV_LOG_INFO,
249 "frame copy needed (have perms %x, need %x, reject %x)\n",
251 link_dpad(link).min_perms, link_dpad(link).rej_perms);
254 link->cur_pic = avfilter_default_get_video_buffer(link, dst->min_perms);
255 link->srcpic = picref;
256 link->cur_pic->pts = link->srcpic->pts;
257 link->cur_pic->pixel_aspect = link->srcpic->pixel_aspect;
260 link->cur_pic = picref;
262 start_frame(link, link->cur_pic);
265 void avfilter_end_frame(AVFilterLink *link)
267 void (*end_frame)(AVFilterLink *);
269 if(!(end_frame = link_dpad(link).end_frame))
270 end_frame = avfilter_default_end_frame;
274 /* unreference the source picture if we're feeding the destination filter
275 * a copied version dues to permission issues */
277 avfilter_unref_pic(link->srcpic);
283 void avfilter_draw_slice(AVFilterLink *link, int y, int h)
285 uint8_t *src[4], *dst[4];
286 int i, j, hsub, vsub;
287 void (*draw_slice)(AVFilterLink *, int, int);
289 DPRINTF_START(NULL, draw_slice); dprintf_link(NULL, link, 0); dprintf(NULL, " y:%d h:%d\n", y, h);
291 /* copy the slice if needed for permission reasons */
293 avcodec_get_chroma_sub_sample(link->format, &hsub, &vsub);
295 for(i = 0; i < 4; i ++) {
296 if(link->srcpic->data[i]) {
297 src[i] = link->srcpic-> data[i] +
298 (y >> (i==0 ? 0 : vsub)) * link->srcpic-> linesize[i];
299 dst[i] = link->cur_pic->data[i] +
300 (y >> (i==0 ? 0 : vsub)) * link->cur_pic->linesize[i];
302 src[i] = dst[i] = NULL;
305 for(i = 0; i < 4; i ++) {
307 ff_get_plane_bytewidth(link->format, link->cur_pic->w, i);
309 if(!src[i]) continue;
311 for(j = 0; j < h >> (i==0 ? 0 : vsub); j ++) {
312 memcpy(dst[i], src[i], planew);
313 src[i] += link->srcpic ->linesize[i];
314 dst[i] += link->cur_pic->linesize[i];
319 if(!(draw_slice = link_dpad(link).draw_slice))
320 draw_slice = avfilter_default_draw_slice;
321 draw_slice(link, y, h);
324 AVFilter *avfilter_get_by_name(const char *name)
326 struct FilterList *filt;
328 for(filt = filters; filt; filt = filt->next)
329 if(!strcmp(filt->filter->name, name))
335 void avfilter_register(AVFilter *filter)
337 struct FilterList *newfilt = av_malloc(sizeof(struct FilterList));
339 newfilt->filter = filter;
340 newfilt->next = filters;
344 void avfilter_uninit(void)
346 struct FilterList *tmp;
348 for(; filters; filters = tmp) {
354 static int pad_count(const AVFilterPad *pads)
358 for(count = 0; pads->name; count ++) pads ++;
362 static const char *filter_name(void *p)
364 AVFilterContext *filter = p;
365 return filter->filter->name;
368 static const AVClass avfilter_class = {
373 AVFilterContext *avfilter_open(AVFilter *filter, const char *inst_name)
375 AVFilterContext *ret;
380 ret = av_mallocz(sizeof(AVFilterContext));
382 ret->av_class = &avfilter_class;
383 ret->filter = filter;
384 ret->name = inst_name ? av_strdup(inst_name) : NULL;
385 ret->priv = av_mallocz(filter->priv_size);
387 ret->input_count = pad_count(filter->inputs);
388 if (ret->input_count) {
389 ret->input_pads = av_malloc(sizeof(AVFilterPad) * ret->input_count);
390 memcpy(ret->input_pads, filter->inputs, sizeof(AVFilterPad) * ret->input_count);
391 ret->inputs = av_mallocz(sizeof(AVFilterLink*) * ret->input_count);
394 ret->output_count = pad_count(filter->outputs);
395 if (ret->output_count) {
396 ret->output_pads = av_malloc(sizeof(AVFilterPad) * ret->output_count);
397 memcpy(ret->output_pads, filter->outputs, sizeof(AVFilterPad) * ret->output_count);
398 ret->outputs = av_mallocz(sizeof(AVFilterLink*) * ret->output_count);
404 void avfilter_destroy(AVFilterContext *filter)
408 if(filter->filter->uninit)
409 filter->filter->uninit(filter);
411 for(i = 0; i < filter->input_count; i ++) {
412 if(filter->inputs[i])
413 filter->inputs[i]->src->outputs[filter->inputs[i]->srcpad] = NULL;
414 av_freep(&filter->inputs[i]);
416 for(i = 0; i < filter->output_count; i ++) {
417 if(filter->outputs[i])
418 filter->outputs[i]->dst->inputs[filter->outputs[i]->dstpad] = NULL;
419 av_freep(&filter->outputs[i]);
422 av_freep(&filter->name);
423 av_freep(&filter->input_pads);
424 av_freep(&filter->output_pads);
425 av_freep(&filter->inputs);
426 av_freep(&filter->outputs);
427 av_freep(&filter->priv);
431 int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque)
435 if(filter->filter->init)
436 ret = filter->filter->init(filter, args, opaque);