[FFmpeg-cvslog] r11965 - trunk/libavfilter/avfilter.c
vitor
subversion
Fri Feb 15 22:33:56 CET 2008
Author: vitor
Date: Fri Feb 15 22:33:56 2008
New Revision: 11965
Log:
Initial stab at an API
Commited in SoC by Bobby Bingham on 2007-06-29 17:03:03
Added:
trunk/libavfilter/avfilter.c
Added: trunk/libavfilter/avfilter.c
==============================================================================
--- (empty file)
+++ trunk/libavfilter/avfilter.c Fri Feb 15 22:33:56 2008
@@ -0,0 +1,268 @@
+/*
+ * Filter layer
+ * copyright (c) 2007 Bobby Bingham
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+
+#include "avfilter.h"
+
+/** list of registered filters, sorted by name */
+static int filter_count = 0;
+static AVFilter **filters = NULL;
+
+/* TODO: buffer pool. see comment for avfilter_default_get_video_buffer() */
+void avfilter_default_free_video_buffer(AVFilterPic *pic)
+{
+ avpicture_free((AVPicture *) pic);
+ av_free(pic);
+}
+
+/* TODO: set the buffer's priv member to a context structure for the whole
+ * filter chain. This will allow for a buffer pool instead of the constant
+ * alloc & free cycle currently implemented. */
+AVFilterPicRef *avfilter_default_get_video_buffer(AVFilterLink *link, int perms)
+{
+ AVFilterPic *pic = av_mallocz(sizeof(AVFilterPic));
+ AVFilterPicRef *ref = av_mallocz(sizeof(AVFilterPicRef));
+
+ ref->pic = pic;
+ ref->w = link->w;
+ ref->h = link->h;
+ ref->perms = perms;
+
+ pic->refcount = 1;
+ pic->format = link->format;
+ pic->free = avfilter_default_free_video_buffer;
+ avpicture_alloc((AVPicture *)pic, pic->format, ref->w, ref->h);
+
+ ref->data[0] = pic->data[0];
+ ref->data[1] = pic->data[1];
+ ref->data[2] = pic->data[2];
+ ref->data[3] = pic->data[3];
+
+ return ref;
+}
+
+void avfilter_default_start_frame(AVFilterLink *link, AVFilterPicRef *picref)
+{
+ link->cur_pic = picref;
+}
+
+void avfilter_default_end_frame(AVFilterLink *link)
+{
+ avfilter_unref_pic(link->cur_pic);
+ link->cur_pic = NULL;
+}
+
+AVFilterPicRef *avfilter_ref_pic(AVFilterPicRef *ref)
+{
+ AVFilterPicRef *ret = av_malloc(sizeof(AVFilterPicRef));
+ memcpy(ret, ref, sizeof(AVFilterPicRef));
+ ret->pic->refcount ++;
+ return ret;
+}
+
+void avfilter_unref_pic(AVFilterPicRef *ref)
+{
+ if(-- ref->pic->refcount == 0)
+ ref->pic->free(ref->pic);
+ av_free(ref);
+}
+
+int avfilter_link(AVFilterContext *src, unsigned srcpad,
+ AVFilterContext *dst, unsigned dstpad)
+{
+ AVFilterLink *link;
+
+ if(src->outputs[srcpad] || dst->inputs[dstpad])
+ return -1;
+
+ src->outputs[srcpad] =
+ dst->inputs[dstpad] = link = av_malloc(sizeof(AVFilterLink));
+
+ link->src = src;
+ link->dst = dst;
+ link->srcpad = srcpad;
+ link->dstpad = dstpad;
+ link->cur_pic = NULL;
+
+ src->filter->outputs[dstpad].set_video_props(link);
+ return 0;
+}
+
+AVFilterPicRef *avfilter_get_video_buffer(AVFilterLink *link, int perms)
+{
+ AVFilterPicRef *ret = NULL;
+
+ if(link->dst->filter->inputs[link->dstpad].get_video_buffer)
+ ret = link->dst->filter->inputs[link->dstpad].get_video_buffer(link, perms);
+
+ if(!ret)
+ ret = avfilter_default_get_video_buffer(link, perms);
+
+ return ret;
+}
+
+void avfilter_request_frame(AVFilterLink *link)
+{
+ link->src->filter->outputs[link->srcpad].request_frame(link);
+}
+
+/* XXX: should we do the duplicating of the picture ref here, instead of
+ * forcing the source filter to do it? */
+void avfilter_start_frame(AVFilterLink *link, AVFilterPicRef *picref)
+{
+ void (*start_frame)(AVFilterLink *, AVFilterPicRef *);
+
+ start_frame = link->dst->filter->inputs[link->dstpad].start_frame;
+ if(!start_frame)
+ start_frame = avfilter_default_start_frame;
+
+ start_frame(link, picref);
+}
+
+void avfilter_end_frame(AVFilterLink *link)
+{
+ void (*end_frame)(AVFilterLink *);
+
+ end_frame = link->dst->filter->inputs[link->dstpad].end_frame;
+ if(!end_frame)
+ end_frame = avfilter_default_end_frame;
+
+ end_frame(link);
+}
+
+void avfilter_draw_slice(AVFilterLink *link, uint8_t *data[4], int y, int h)
+{
+ link->dst->filter->inputs[link->dstpad].draw_slice(link, data, y, h);
+}
+
+static int filter_cmp(const void *aa, const void *bb)
+{
+ const AVFilter *a = *(const AVFilter **)aa, *b = *(const AVFilter **)bb;
+ return strcmp(a->name, b->name);
+}
+
+AVFilter *avfilter_get_by_name(char *name)
+{
+ AVFilter key = { .name = name, };
+ AVFilter *key2 = &key;
+ AVFilter **ret;
+
+ ret = bsearch(&key2, filters, filter_count, sizeof(AVFilter **), filter_cmp);
+ if(ret)
+ return *ret;
+ return NULL;
+}
+
+/* FIXME: insert in order, rather than insert at end + resort */
+void avfilter_register(AVFilter *filter)
+{
+ filters = av_realloc(filters, sizeof(AVFilter*) * (filter_count+1));
+ filters[filter_count] = filter;
+ qsort(filters, ++filter_count, sizeof(AVFilter **), filter_cmp);
+}
+
+void avfilter_init(void)
+{
+}
+
+void avfilter_uninit(void)
+{
+ av_freep(&filters);
+ filter_count = 0;
+}
+
+static int pad_count(const AVFilterPad *pads)
+{
+ AVFilterPad *p = (AVFilterPad *) pads;
+ int count;
+
+ for(count = 0; p->name; count ++) p ++;
+ return count;
+}
+
+static const char *filter_name(void *p)
+{
+ AVFilterContext *filter = p;
+ return filter->filter->name;
+}
+
+AVFilterContext *avfilter_create(AVFilter *filter)
+{
+ AVFilterContext *ret = av_malloc(sizeof(AVFilterContext));
+
+ ret->av_class = av_mallocz(sizeof(AVClass));
+ ret->av_class->item_name = filter_name;
+ ret->filter = filter;
+ ret->inputs = av_mallocz(sizeof(AVFilterLink*) * pad_count(filter->inputs));
+ ret->outputs = av_mallocz(sizeof(AVFilterLink*) * pad_count(filter->outputs));
+ ret->priv = av_mallocz(filter->priv_size);
+
+ return ret;
+}
+
+void avfilter_destroy(AVFilterContext *filter)
+{
+ int i;
+
+ if(filter->filter->uninit)
+ filter->filter->uninit(filter);
+
+ for(i = 0; i < pad_count(filter->filter->inputs); i ++) {
+ if(filter->inputs[i])
+ filter->inputs[i]->src->outputs[filter->inputs[i]->srcpad] = NULL;
+ av_free(filter->inputs[i]);
+ }
+ for(i = 0; i < pad_count(filter->filter->outputs); i ++) {
+ if(filter->outputs[i])
+ filter->outputs[i]->dst->inputs[filter->outputs[i]->dstpad] = NULL;
+ av_free(filter->outputs[i]);
+ }
+
+ av_free(filter->inputs);
+ av_free(filter->outputs);
+ av_free(filter->priv);
+ av_free(filter->av_class);
+ av_free(filter);
+}
+
+AVFilterContext *avfilter_create_by_name(char *name)
+{
+ AVFilter *filt;
+
+ if(!(filt = avfilter_get_by_name(name))) return NULL;
+ return avfilter_create(filt);
+}
+
+int avfilter_init_filter(AVFilterContext *filter)
+{
+ int ret, i;
+
+ if(filter->filter->init)
+ if((ret = filter->filter->init(filter))) return ret;
+ for(i = 0; i < pad_count(filter->filter->outputs); i ++)
+ if(filter->outputs[i])
+ filter->filter->outputs[i].set_video_props(filter->outputs[i]);
+ return 0;
+}
+
More information about the ffmpeg-cvslog
mailing list