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Initial stab at an API
Commited in SoC by Bobby Bingham on 2007-06-29 17:03:03 Originally committed as revision 11965 to svn://svn.ffmpeg.org/ffmpeg/trunk
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libavfilter/avfilter.c
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268
libavfilter/avfilter.c
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/*
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* Filter layer
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* copyright (c) 2007 Bobby Bingham
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include "avfilter.h"
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/** list of registered filters, sorted by name */
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static int filter_count = 0;
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static AVFilter **filters = NULL;
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/* TODO: buffer pool. see comment for avfilter_default_get_video_buffer() */
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void avfilter_default_free_video_buffer(AVFilterPic *pic)
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{
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avpicture_free((AVPicture *) pic);
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av_free(pic);
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}
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/* TODO: set the buffer's priv member to a context structure for the whole
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* filter chain. This will allow for a buffer pool instead of the constant
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* alloc & free cycle currently implemented. */
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AVFilterPicRef *avfilter_default_get_video_buffer(AVFilterLink *link, int perms)
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{
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AVFilterPic *pic = av_mallocz(sizeof(AVFilterPic));
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AVFilterPicRef *ref = av_mallocz(sizeof(AVFilterPicRef));
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ref->pic = pic;
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ref->w = link->w;
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ref->h = link->h;
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ref->perms = perms;
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pic->refcount = 1;
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pic->format = link->format;
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pic->free = avfilter_default_free_video_buffer;
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avpicture_alloc((AVPicture *)pic, pic->format, ref->w, ref->h);
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ref->data[0] = pic->data[0];
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ref->data[1] = pic->data[1];
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ref->data[2] = pic->data[2];
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ref->data[3] = pic->data[3];
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return ref;
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}
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void avfilter_default_start_frame(AVFilterLink *link, AVFilterPicRef *picref)
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{
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link->cur_pic = picref;
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}
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void avfilter_default_end_frame(AVFilterLink *link)
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{
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avfilter_unref_pic(link->cur_pic);
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link->cur_pic = NULL;
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}
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AVFilterPicRef *avfilter_ref_pic(AVFilterPicRef *ref)
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{
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AVFilterPicRef *ret = av_malloc(sizeof(AVFilterPicRef));
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memcpy(ret, ref, sizeof(AVFilterPicRef));
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ret->pic->refcount ++;
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return ret;
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}
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void avfilter_unref_pic(AVFilterPicRef *ref)
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{
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if(-- ref->pic->refcount == 0)
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ref->pic->free(ref->pic);
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av_free(ref);
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}
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int avfilter_link(AVFilterContext *src, unsigned srcpad,
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AVFilterContext *dst, unsigned dstpad)
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{
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AVFilterLink *link;
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if(src->outputs[srcpad] || dst->inputs[dstpad])
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return -1;
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src->outputs[srcpad] =
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dst->inputs[dstpad] = link = av_malloc(sizeof(AVFilterLink));
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link->src = src;
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link->dst = dst;
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link->srcpad = srcpad;
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link->dstpad = dstpad;
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link->cur_pic = NULL;
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src->filter->outputs[dstpad].set_video_props(link);
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return 0;
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}
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AVFilterPicRef *avfilter_get_video_buffer(AVFilterLink *link, int perms)
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{
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AVFilterPicRef *ret = NULL;
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if(link->dst->filter->inputs[link->dstpad].get_video_buffer)
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ret = link->dst->filter->inputs[link->dstpad].get_video_buffer(link, perms);
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if(!ret)
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ret = avfilter_default_get_video_buffer(link, perms);
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return ret;
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}
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void avfilter_request_frame(AVFilterLink *link)
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{
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link->src->filter->outputs[link->srcpad].request_frame(link);
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}
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/* XXX: should we do the duplicating of the picture ref here, instead of
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* forcing the source filter to do it? */
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void avfilter_start_frame(AVFilterLink *link, AVFilterPicRef *picref)
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{
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void (*start_frame)(AVFilterLink *, AVFilterPicRef *);
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start_frame = link->dst->filter->inputs[link->dstpad].start_frame;
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if(!start_frame)
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start_frame = avfilter_default_start_frame;
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start_frame(link, picref);
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}
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void avfilter_end_frame(AVFilterLink *link)
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{
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void (*end_frame)(AVFilterLink *);
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end_frame = link->dst->filter->inputs[link->dstpad].end_frame;
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if(!end_frame)
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end_frame = avfilter_default_end_frame;
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end_frame(link);
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}
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void avfilter_draw_slice(AVFilterLink *link, uint8_t *data[4], int y, int h)
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{
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link->dst->filter->inputs[link->dstpad].draw_slice(link, data, y, h);
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}
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static int filter_cmp(const void *aa, const void *bb)
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{
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const AVFilter *a = *(const AVFilter **)aa, *b = *(const AVFilter **)bb;
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return strcmp(a->name, b->name);
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}
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AVFilter *avfilter_get_by_name(char *name)
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{
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AVFilter key = { .name = name, };
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AVFilter *key2 = &key;
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AVFilter **ret;
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ret = bsearch(&key2, filters, filter_count, sizeof(AVFilter **), filter_cmp);
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if(ret)
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return *ret;
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return NULL;
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}
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/* FIXME: insert in order, rather than insert at end + resort */
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void avfilter_register(AVFilter *filter)
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{
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filters = av_realloc(filters, sizeof(AVFilter*) * (filter_count+1));
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filters[filter_count] = filter;
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qsort(filters, ++filter_count, sizeof(AVFilter **), filter_cmp);
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}
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void avfilter_init(void)
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{
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}
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void avfilter_uninit(void)
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{
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av_freep(&filters);
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filter_count = 0;
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}
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static int pad_count(const AVFilterPad *pads)
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{
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AVFilterPad *p = (AVFilterPad *) pads;
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int count;
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for(count = 0; p->name; count ++) p ++;
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return count;
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}
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static const char *filter_name(void *p)
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{
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AVFilterContext *filter = p;
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return filter->filter->name;
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}
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AVFilterContext *avfilter_create(AVFilter *filter)
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{
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AVFilterContext *ret = av_malloc(sizeof(AVFilterContext));
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ret->av_class = av_mallocz(sizeof(AVClass));
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ret->av_class->item_name = filter_name;
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ret->filter = filter;
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ret->inputs = av_mallocz(sizeof(AVFilterLink*) * pad_count(filter->inputs));
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ret->outputs = av_mallocz(sizeof(AVFilterLink*) * pad_count(filter->outputs));
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ret->priv = av_mallocz(filter->priv_size);
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return ret;
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}
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void avfilter_destroy(AVFilterContext *filter)
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{
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int i;
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if(filter->filter->uninit)
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filter->filter->uninit(filter);
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for(i = 0; i < pad_count(filter->filter->inputs); i ++) {
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if(filter->inputs[i])
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filter->inputs[i]->src->outputs[filter->inputs[i]->srcpad] = NULL;
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av_free(filter->inputs[i]);
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}
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for(i = 0; i < pad_count(filter->filter->outputs); i ++) {
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if(filter->outputs[i])
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filter->outputs[i]->dst->inputs[filter->outputs[i]->dstpad] = NULL;
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av_free(filter->outputs[i]);
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}
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av_free(filter->inputs);
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av_free(filter->outputs);
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av_free(filter->priv);
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av_free(filter->av_class);
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av_free(filter);
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}
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AVFilterContext *avfilter_create_by_name(char *name)
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{
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AVFilter *filt;
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if(!(filt = avfilter_get_by_name(name))) return NULL;
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return avfilter_create(filt);
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}
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int avfilter_init_filter(AVFilterContext *filter)
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{
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int ret, i;
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if(filter->filter->init)
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if((ret = filter->filter->init(filter))) return ret;
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for(i = 0; i < pad_count(filter->filter->outputs); i ++)
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if(filter->outputs[i])
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filter->filter->outputs[i].set_video_props(filter->outputs[i]);
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return 0;
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}
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