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"
25 #include "libavutil/pixdesc.h"
28 unsigned avfilter_version(void) {
29 return LIBAVFILTER_VERSION_INT;
32 const char *avfilter_configuration(void)
34 return FFMPEG_CONFIGURATION;
37 const char *avfilter_license(void)
39 #define LICENSE_PREFIX "libavfilter license: "
40 return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;
43 /** helper macros to get the in/out pad on the dst/src filter */
44 #define link_dpad(link) link->dst-> input_pads[link->dstpad]
45 #define link_spad(link) link->src->output_pads[link->srcpad]
47 AVFilterPicRef *avfilter_ref_pic(AVFilterPicRef *ref, int pmask)
49 AVFilterPicRef *ret = av_malloc(sizeof(AVFilterPicRef));
52 ret->pic->refcount ++;
56 void avfilter_unref_pic(AVFilterPicRef *ref)
58 if(!(--ref->pic->refcount))
59 ref->pic->free(ref->pic);
63 void avfilter_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
64 AVFilterPad **pads, AVFilterLink ***links,
69 idx = FFMIN(idx, *count);
71 *pads = av_realloc(*pads, sizeof(AVFilterPad) * (*count + 1));
72 *links = av_realloc(*links, sizeof(AVFilterLink*) * (*count + 1));
73 memmove(*pads +idx+1, *pads +idx, sizeof(AVFilterPad) * (*count-idx));
74 memmove(*links+idx+1, *links+idx, sizeof(AVFilterLink*) * (*count-idx));
75 memcpy(*pads+idx, newpad, sizeof(AVFilterPad));
79 for(i = idx+1; i < *count; i ++)
81 (*(unsigned *)((uint8_t *) *links[i] + padidx_off)) ++;
84 int avfilter_link(AVFilterContext *src, unsigned srcpad,
85 AVFilterContext *dst, unsigned dstpad)
89 if(src->output_count <= srcpad || dst->input_count <= dstpad ||
90 src->outputs[srcpad] || dst->inputs[dstpad])
93 src->outputs[srcpad] =
94 dst-> inputs[dstpad] = link = av_mallocz(sizeof(AVFilterLink));
98 link->srcpad = srcpad;
99 link->dstpad = dstpad;
100 link->format = PIX_FMT_NONE;
105 int avfilter_insert_filter(AVFilterLink *link, AVFilterContext *filt,
106 unsigned in, unsigned out)
108 av_log(link->dst, AV_LOG_INFO, "auto-inserting filter '%s' "
109 "between the filter '%s' and the filter '%s'\n",
110 filt->name, link->src->name, link->dst->name);
112 link->dst->inputs[link->dstpad] = NULL;
113 if(avfilter_link(filt, out, link->dst, link->dstpad)) {
114 /* failed to link output filter to new filter */
115 link->dst->inputs[link->dstpad] = link;
119 /* re-hookup the link to the new destination filter we inserted */
122 filt->inputs[in] = link;
124 /* if any information on supported colorspaces already exists on the
125 * link, we need to preserve that */
126 if(link->out_formats)
127 avfilter_formats_changeref(&link->out_formats,
128 &filt->outputs[out]->out_formats);
133 int avfilter_config_links(AVFilterContext *filter)
135 int (*config_link)(AVFilterLink *);
138 for(i = 0; i < filter->input_count; i ++) {
139 AVFilterLink *link = filter->inputs[i];
143 switch(link->init_state) {
146 case AVLINK_STARTINIT:
147 av_log(filter, AV_LOG_INFO, "circular filter chain detected\n");
150 link->init_state = AVLINK_STARTINIT;
152 if(avfilter_config_links(link->src))
155 if(!(config_link = link_spad(link).config_props))
156 config_link = avfilter_default_config_output_link;
157 if(config_link(link))
160 if((config_link = link_dpad(link).config_props))
161 if(config_link(link))
164 link->init_state = AVLINK_INIT;
171 static void dprintf_picref(void *ctx, AVFilterPicRef *picref, int end)
174 "picref[%p data[%p, %p, %p, %p] linesize[%d, %d, %d, %d] pts:%"PRId64" pos:%"PRId64" a:%d/%d s:%dx%d]%s",
176 picref->data [0], picref->data [1], picref->data [2], picref->data [3],
177 picref->linesize[0], picref->linesize[1], picref->linesize[2], picref->linesize[3],
178 picref->pts, picref->pos,
179 picref->pixel_aspect.num, picref->pixel_aspect.den, picref->w, picref->h,
183 static void dprintf_link(void *ctx, AVFilterLink *link, int end)
186 "link[%p s:%dx%d fmt:%-16s %-16s->%-16s]%s",
187 link, link->w, link->h,
188 av_pix_fmt_descriptors[link->format].name,
189 link->src ? link->src->filter->name : "",
190 link->dst ? link->dst->filter->name : "",
194 #define DPRINTF_START(ctx, func) dprintf(NULL, "%-16s: ", #func)
196 AVFilterPicRef *avfilter_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
198 AVFilterPicRef *ret = NULL;
200 DPRINTF_START(NULL, get_video_buffer); dprintf_link(NULL, link, 0); dprintf(NULL, " perms:%d w:%d h:%d\n", perms, w, h);
202 if(link_dpad(link).get_video_buffer)
203 ret = link_dpad(link).get_video_buffer(link, perms, w, h);
206 ret = avfilter_default_get_video_buffer(link, perms, w, h);
208 DPRINTF_START(NULL, get_video_buffer); dprintf_link(NULL, link, 0); dprintf(NULL, " returning "); dprintf_picref(NULL, ret, 1);
213 int avfilter_request_frame(AVFilterLink *link)
215 DPRINTF_START(NULL, request_frame); dprintf_link(NULL, link, 1);
217 if(link_spad(link).request_frame)
218 return link_spad(link).request_frame(link);
219 else if(link->src->inputs[0])
220 return avfilter_request_frame(link->src->inputs[0]);
224 int avfilter_poll_frame(AVFilterLink *link)
228 if(link_spad(link).poll_frame)
229 return link_spad(link).poll_frame(link);
231 for (i=0; i<link->src->input_count; i++) {
233 if(!link->src->inputs[i])
235 val = avfilter_poll_frame(link->src->inputs[i]);
236 min = FFMIN(min, val);
242 /* XXX: should we do the duplicating of the picture ref here, instead of
243 * forcing the source filter to do it? */
244 void avfilter_start_frame(AVFilterLink *link, AVFilterPicRef *picref)
246 void (*start_frame)(AVFilterLink *, AVFilterPicRef *);
247 AVFilterPad *dst = &link_dpad(link);
249 DPRINTF_START(NULL, start_frame); dprintf_link(NULL, link, 0); dprintf(NULL, " "); dprintf_picref(NULL, picref, 1);
251 if(!(start_frame = dst->start_frame))
252 start_frame = avfilter_default_start_frame;
254 /* prepare to copy the picture if it has insufficient permissions */
255 if((dst->min_perms & picref->perms) != dst->min_perms ||
256 dst->rej_perms & picref->perms) {
258 av_log(link->dst, AV_LOG_INFO,
259 "frame copy needed (have perms %x, need %x, reject %x)\n",
261 link_dpad(link).min_perms, link_dpad(link).rej_perms);
264 link->cur_pic = avfilter_default_get_video_buffer(link, dst->min_perms, link->w, link->h);
265 link->srcpic = picref;
266 link->cur_pic->pts = link->srcpic->pts;
267 link->cur_pic->pos = link->srcpic->pos;
268 link->cur_pic->pixel_aspect = link->srcpic->pixel_aspect;
271 link->cur_pic = picref;
273 start_frame(link, link->cur_pic);
276 void avfilter_end_frame(AVFilterLink *link)
278 void (*end_frame)(AVFilterLink *);
280 if(!(end_frame = link_dpad(link).end_frame))
281 end_frame = avfilter_default_end_frame;
285 /* unreference the source picture if we're feeding the destination filter
286 * a copied version dues to permission issues */
288 avfilter_unref_pic(link->srcpic);
294 void avfilter_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
296 uint8_t *src[4], *dst[4];
298 void (*draw_slice)(AVFilterLink *, int, int, int);
300 DPRINTF_START(NULL, draw_slice); dprintf_link(NULL, link, 0); dprintf(NULL, " y:%d h:%d dir:%d\n", y, h, slice_dir);
302 /* copy the slice if needed for permission reasons */
304 vsub = av_pix_fmt_descriptors[link->format].log2_chroma_h;
306 for(i = 0; i < 4; i ++) {
307 if(link->srcpic->data[i]) {
308 src[i] = link->srcpic-> data[i] +
309 (y >> (i==0 ? 0 : vsub)) * link->srcpic-> linesize[i];
310 dst[i] = link->cur_pic->data[i] +
311 (y >> (i==0 ? 0 : vsub)) * link->cur_pic->linesize[i];
313 src[i] = dst[i] = NULL;
316 for(i = 0; i < 4; i ++) {
318 ff_get_plane_bytewidth(link->format, link->cur_pic->w, i);
320 if(!src[i]) continue;
322 for(j = 0; j < h >> (i==0 ? 0 : vsub); j ++) {
323 memcpy(dst[i], src[i], planew);
324 src[i] += link->srcpic ->linesize[i];
325 dst[i] += link->cur_pic->linesize[i];
330 if(!(draw_slice = link_dpad(link).draw_slice))
331 draw_slice = avfilter_default_draw_slice;
332 draw_slice(link, y, h, slice_dir);
335 #define MAX_REGISTERED_AVFILTERS_NB 64
337 static AVFilter *registered_avfilters[MAX_REGISTERED_AVFILTERS_NB + 1];
339 static int next_registered_avfilter_idx = 0;
341 AVFilter *avfilter_get_by_name(const char *name)
345 for (i = 0; registered_avfilters[i]; i++)
346 if (!strcmp(registered_avfilters[i]->name, name))
347 return registered_avfilters[i];
352 int avfilter_register(AVFilter *filter)
354 if (next_registered_avfilter_idx == MAX_REGISTERED_AVFILTERS_NB)
357 registered_avfilters[next_registered_avfilter_idx++] = filter;
361 AVFilter **av_filter_next(AVFilter **filter)
363 return filter ? ++filter : ®istered_avfilters[0];
366 void avfilter_uninit(void)
368 memset(registered_avfilters, 0, sizeof(registered_avfilters));
369 next_registered_avfilter_idx = 0;
372 static int pad_count(const AVFilterPad *pads)
376 for(count = 0; pads->name; count ++) pads ++;
380 static const char *filter_name(void *p)
382 AVFilterContext *filter = p;
383 return filter->filter->name;
386 static const AVClass avfilter_class = {
390 LIBAVUTIL_VERSION_INT,
393 AVFilterContext *avfilter_open(AVFilter *filter, const char *inst_name)
395 AVFilterContext *ret;
400 ret = av_mallocz(sizeof(AVFilterContext));
402 ret->av_class = &avfilter_class;
403 ret->filter = filter;
404 ret->name = inst_name ? av_strdup(inst_name) : NULL;
405 ret->priv = av_mallocz(filter->priv_size);
407 ret->input_count = pad_count(filter->inputs);
408 if (ret->input_count) {
409 ret->input_pads = av_malloc(sizeof(AVFilterPad) * ret->input_count);
410 memcpy(ret->input_pads, filter->inputs, sizeof(AVFilterPad) * ret->input_count);
411 ret->inputs = av_mallocz(sizeof(AVFilterLink*) * ret->input_count);
414 ret->output_count = pad_count(filter->outputs);
415 if (ret->output_count) {
416 ret->output_pads = av_malloc(sizeof(AVFilterPad) * ret->output_count);
417 memcpy(ret->output_pads, filter->outputs, sizeof(AVFilterPad) * ret->output_count);
418 ret->outputs = av_mallocz(sizeof(AVFilterLink*) * ret->output_count);
424 void avfilter_destroy(AVFilterContext *filter)
428 if(filter->filter->uninit)
429 filter->filter->uninit(filter);
431 for(i = 0; i < filter->input_count; i ++) {
432 if(filter->inputs[i])
433 filter->inputs[i]->src->outputs[filter->inputs[i]->srcpad] = NULL;
434 av_freep(&filter->inputs[i]);
436 for(i = 0; i < filter->output_count; i ++) {
437 if(filter->outputs[i])
438 filter->outputs[i]->dst->inputs[filter->outputs[i]->dstpad] = NULL;
439 av_freep(&filter->outputs[i]);
442 av_freep(&filter->name);
443 av_freep(&filter->input_pads);
444 av_freep(&filter->output_pads);
445 av_freep(&filter->inputs);
446 av_freep(&filter->outputs);
447 av_freep(&filter->priv);
451 int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque)
455 if(filter->filter->init)
456 ret = filter->filter->init(filter, args, opaque);