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"
29 unsigned avfilter_version(void) {
30 return LIBAVFILTER_VERSION_INT;
33 const char *avfilter_configuration(void)
35 return FFMPEG_CONFIGURATION;
38 const char *avfilter_license(void)
40 #define LICENSE_PREFIX "libavfilter license: "
41 return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;
44 /** helper macros to get the in/out pad on the dst/src filter */
45 #define link_dpad(link) link->dst-> input_pads[link->dstpad]
46 #define link_spad(link) link->src->output_pads[link->srcpad]
48 AVFilterBufferRef *avfilter_ref_buffer(AVFilterBufferRef *ref, int pmask)
50 AVFilterBufferRef *ret = av_malloc(sizeof(AVFilterBufferRef));
52 if (ref->type == AVMEDIA_TYPE_VIDEO) {
53 ret->video = av_malloc(sizeof(AVFilterBufferRefVideoProps));
54 *ret->video = *ref->video;
57 ret->buf->refcount ++;
61 void avfilter_unref_buffer(AVFilterBufferRef *ref)
63 if(!(--ref->buf->refcount))
64 ref->buf->free(ref->buf);
69 void avfilter_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
70 AVFilterPad **pads, AVFilterLink ***links,
75 idx = FFMIN(idx, *count);
77 *pads = av_realloc(*pads, sizeof(AVFilterPad) * (*count + 1));
78 *links = av_realloc(*links, sizeof(AVFilterLink*) * (*count + 1));
79 memmove(*pads +idx+1, *pads +idx, sizeof(AVFilterPad) * (*count-idx));
80 memmove(*links+idx+1, *links+idx, sizeof(AVFilterLink*) * (*count-idx));
81 memcpy(*pads+idx, newpad, sizeof(AVFilterPad));
85 for(i = idx+1; i < *count; i ++)
87 (*(unsigned *)((uint8_t *) *links[i] + padidx_off)) ++;
90 int avfilter_link(AVFilterContext *src, unsigned srcpad,
91 AVFilterContext *dst, unsigned dstpad)
95 if(src->output_count <= srcpad || dst->input_count <= dstpad ||
96 src->outputs[srcpad] || dst->inputs[dstpad])
99 src->outputs[srcpad] =
100 dst-> inputs[dstpad] = link = av_mallocz(sizeof(AVFilterLink));
104 link->srcpad = srcpad;
105 link->dstpad = dstpad;
106 link->type = src->output_pads[srcpad].type;
107 assert(PIX_FMT_NONE == -1 && SAMPLE_FMT_NONE == -1);
113 int avfilter_insert_filter(AVFilterLink *link, AVFilterContext *filt,
114 unsigned in, unsigned out)
116 av_log(link->dst, AV_LOG_INFO, "auto-inserting filter '%s' "
117 "between the filter '%s' and the filter '%s'\n",
118 filt->name, link->src->name, link->dst->name);
120 link->dst->inputs[link->dstpad] = NULL;
121 if(avfilter_link(filt, out, link->dst, link->dstpad)) {
122 /* failed to link output filter to new filter */
123 link->dst->inputs[link->dstpad] = link;
127 /* re-hookup the link to the new destination filter we inserted */
130 filt->inputs[in] = link;
132 /* if any information on supported media formats already exists on the
133 * link, we need to preserve that */
134 if(link->out_formats)
135 avfilter_formats_changeref(&link->out_formats,
136 &filt->outputs[out]->out_formats);
141 int avfilter_config_links(AVFilterContext *filter)
143 int (*config_link)(AVFilterLink *);
146 for(i = 0; i < filter->input_count; i ++) {
147 AVFilterLink *link = filter->inputs[i];
151 switch(link->init_state) {
154 case AVLINK_STARTINIT:
155 av_log(filter, AV_LOG_INFO, "circular filter chain detected\n");
158 link->init_state = AVLINK_STARTINIT;
160 if(avfilter_config_links(link->src))
163 if(!(config_link = link_spad(link).config_props))
164 config_link = avfilter_default_config_output_link;
165 if(config_link(link))
168 if((config_link = link_dpad(link).config_props))
169 if(config_link(link))
172 link->init_state = AVLINK_INIT;
179 void ff_dprintf_picref(void *ctx, AVFilterBufferRef *picref, int end)
182 "picref[%p data[%p, %p, %p, %p] linesize[%d, %d, %d, %d] pts:%"PRId64" pos:%"PRId64" a:%d/%d s:%dx%d]%s",
184 picref->data [0], picref->data [1], picref->data [2], picref->data [3],
185 picref->linesize[0], picref->linesize[1], picref->linesize[2], picref->linesize[3],
186 picref->pts, picref->pos,
187 picref->video->pixel_aspect.num, picref->video->pixel_aspect.den, picref->video->w, picref->video->h,
191 void ff_dprintf_link(void *ctx, AVFilterLink *link, int end)
194 "link[%p s:%dx%d fmt:%-16s %-16s->%-16s]%s",
195 link, link->w, link->h,
196 av_pix_fmt_descriptors[link->format].name,
197 link->src ? link->src->filter->name : "",
198 link->dst ? link->dst->filter->name : "",
202 AVFilterBufferRef *avfilter_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
204 AVFilterBufferRef *ret = NULL;
206 FF_DPRINTF_START(NULL, get_video_buffer); ff_dprintf_link(NULL, link, 0); dprintf(NULL, " perms:%d w:%d h:%d\n", perms, w, h);
208 if(link_dpad(link).get_video_buffer)
209 ret = link_dpad(link).get_video_buffer(link, perms, w, h);
212 ret = avfilter_default_get_video_buffer(link, perms, w, h);
214 FF_DPRINTF_START(NULL, get_video_buffer); ff_dprintf_link(NULL, link, 0); dprintf(NULL, " returning "); ff_dprintf_picref(NULL, ret, 1);
219 int avfilter_request_frame(AVFilterLink *link)
221 FF_DPRINTF_START(NULL, request_frame); ff_dprintf_link(NULL, link, 1);
223 if(link_spad(link).request_frame)
224 return link_spad(link).request_frame(link);
225 else if(link->src->inputs[0])
226 return avfilter_request_frame(link->src->inputs[0]);
230 int avfilter_poll_frame(AVFilterLink *link)
234 if(link_spad(link).poll_frame)
235 return link_spad(link).poll_frame(link);
237 for (i=0; i<link->src->input_count; i++) {
239 if(!link->src->inputs[i])
241 val = avfilter_poll_frame(link->src->inputs[i]);
242 min = FFMIN(min, val);
248 /* XXX: should we do the duplicating of the picture ref here, instead of
249 * forcing the source filter to do it? */
250 void avfilter_start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
252 void (*start_frame)(AVFilterLink *, AVFilterBufferRef *);
253 AVFilterPad *dst = &link_dpad(link);
255 FF_DPRINTF_START(NULL, start_frame); ff_dprintf_link(NULL, link, 0); dprintf(NULL, " "); ff_dprintf_picref(NULL, picref, 1);
257 if(!(start_frame = dst->start_frame))
258 start_frame = avfilter_default_start_frame;
260 /* prepare to copy the picture if it has insufficient permissions */
261 if((dst->min_perms & picref->perms) != dst->min_perms ||
262 dst->rej_perms & picref->perms) {
264 av_log(link->dst, AV_LOG_INFO,
265 "frame copy needed (have perms %x, need %x, reject %x)\n",
267 link_dpad(link).min_perms, link_dpad(link).rej_perms);
270 link->cur_buf = avfilter_default_get_video_buffer(link, dst->min_perms, link->w, link->h);
271 link->src_buf = picref;
272 avfilter_copy_buffer_ref_props(link->cur_buf, link->src_buf);
275 link->cur_buf = picref;
277 start_frame(link, link->cur_buf);
280 void avfilter_end_frame(AVFilterLink *link)
282 void (*end_frame)(AVFilterLink *);
284 if(!(end_frame = link_dpad(link).end_frame))
285 end_frame = avfilter_default_end_frame;
289 /* unreference the source picture if we're feeding the destination filter
290 * a copied version dues to permission issues */
292 avfilter_unref_buffer(link->src_buf);
293 link->src_buf = NULL;
298 void avfilter_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
300 uint8_t *src[4], *dst[4];
302 void (*draw_slice)(AVFilterLink *, int, int, int);
304 FF_DPRINTF_START(NULL, draw_slice); ff_dprintf_link(NULL, link, 0); dprintf(NULL, " y:%d h:%d dir:%d\n", y, h, slice_dir);
306 /* copy the slice if needed for permission reasons */
308 vsub = av_pix_fmt_descriptors[link->format].log2_chroma_h;
310 for(i = 0; i < 4; i ++) {
311 if(link->src_buf->data[i]) {
312 src[i] = link->src_buf-> data[i] +
313 (y >> (i==0 ? 0 : vsub)) * link->src_buf-> linesize[i];
314 dst[i] = link->cur_buf->data[i] +
315 (y >> (i==0 ? 0 : vsub)) * link->cur_buf->linesize[i];
317 src[i] = dst[i] = NULL;
320 for(i = 0; i < 4; i ++) {
322 ff_get_plane_bytewidth(link->format, link->cur_buf->video->w, i);
324 if(!src[i]) continue;
326 for(j = 0; j < h >> (i==0 ? 0 : vsub); j ++) {
327 memcpy(dst[i], src[i], planew);
328 src[i] += link->src_buf ->linesize[i];
329 dst[i] += link->cur_buf->linesize[i];
334 if(!(draw_slice = link_dpad(link).draw_slice))
335 draw_slice = avfilter_default_draw_slice;
336 draw_slice(link, y, h, slice_dir);
339 #define MAX_REGISTERED_AVFILTERS_NB 64
341 static AVFilter *registered_avfilters[MAX_REGISTERED_AVFILTERS_NB + 1];
343 static int next_registered_avfilter_idx = 0;
345 AVFilter *avfilter_get_by_name(const char *name)
349 for (i = 0; registered_avfilters[i]; i++)
350 if (!strcmp(registered_avfilters[i]->name, name))
351 return registered_avfilters[i];
356 int avfilter_register(AVFilter *filter)
358 if (next_registered_avfilter_idx == MAX_REGISTERED_AVFILTERS_NB)
361 registered_avfilters[next_registered_avfilter_idx++] = filter;
365 AVFilter **av_filter_next(AVFilter **filter)
367 return filter ? ++filter : ®istered_avfilters[0];
370 void avfilter_uninit(void)
372 memset(registered_avfilters, 0, sizeof(registered_avfilters));
373 next_registered_avfilter_idx = 0;
376 static int pad_count(const AVFilterPad *pads)
380 for(count = 0; pads->name; count ++) pads ++;
384 static const char *filter_name(void *p)
386 AVFilterContext *filter = p;
387 return filter->filter->name;
390 static const AVClass avfilter_class = {
394 LIBAVUTIL_VERSION_INT,
397 int avfilter_open(AVFilterContext **filter_ctx, AVFilter *filter, const char *inst_name)
399 AVFilterContext *ret;
403 return AVERROR(EINVAL);
405 ret = av_mallocz(sizeof(AVFilterContext));
407 ret->av_class = &avfilter_class;
408 ret->filter = filter;
409 ret->name = inst_name ? av_strdup(inst_name) : NULL;
410 ret->priv = av_mallocz(filter->priv_size);
412 ret->input_count = pad_count(filter->inputs);
413 if (ret->input_count) {
414 ret->input_pads = av_malloc(sizeof(AVFilterPad) * ret->input_count);
415 memcpy(ret->input_pads, filter->inputs, sizeof(AVFilterPad) * ret->input_count);
416 ret->inputs = av_mallocz(sizeof(AVFilterLink*) * ret->input_count);
419 ret->output_count = pad_count(filter->outputs);
420 if (ret->output_count) {
421 ret->output_pads = av_malloc(sizeof(AVFilterPad) * ret->output_count);
422 memcpy(ret->output_pads, filter->outputs, sizeof(AVFilterPad) * ret->output_count);
423 ret->outputs = av_mallocz(sizeof(AVFilterLink*) * ret->output_count);
430 void avfilter_destroy(AVFilterContext *filter)
434 if(filter->filter->uninit)
435 filter->filter->uninit(filter);
437 for(i = 0; i < filter->input_count; i ++) {
438 if(filter->inputs[i]) {
439 if (filter->inputs[i]->src)
440 filter->inputs[i]->src->outputs[filter->inputs[i]->srcpad] = NULL;
441 avfilter_formats_unref(&filter->inputs[i]->in_formats);
442 avfilter_formats_unref(&filter->inputs[i]->out_formats);
444 av_freep(&filter->inputs[i]);
446 for(i = 0; i < filter->output_count; i ++) {
447 if(filter->outputs[i]) {
448 if (filter->outputs[i]->dst)
449 filter->outputs[i]->dst->inputs[filter->outputs[i]->dstpad] = NULL;
450 avfilter_formats_unref(&filter->outputs[i]->in_formats);
451 avfilter_formats_unref(&filter->outputs[i]->out_formats);
453 av_freep(&filter->outputs[i]);
456 av_freep(&filter->name);
457 av_freep(&filter->input_pads);
458 av_freep(&filter->output_pads);
459 av_freep(&filter->inputs);
460 av_freep(&filter->outputs);
461 av_freep(&filter->priv);
465 int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque)
469 if(filter->filter->init)
470 ret = filter->filter->init(filter, args, opaque);