[libav.git] / libavfilter / avfilter.c

/*
 * 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 <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>

#include "avfilter.h"
#include "allfilters.h"

/** list of registered filters */
struct FilterList
{
    AVFilter *filter;
    struct FilterList *next;
} *filters = NULL;

/** helper macros to get the in/out pad on the dst/src filter */
#define link_dpad(link)     link->dst-> input_pads[link->dstpad]
#define link_spad(link)     link->src->output_pads[link->srcpad]

AVFilterPicRef *avfilter_ref_pic(AVFilterPicRef *ref, int pmask)
{
    AVFilterPicRef *ret = av_malloc(sizeof(AVFilterPicRef));
    *ret = *ref;
    ret->perms &= pmask;
    ret->pic->refcount ++;
    return ret;
}

void avfilter_unref_pic(AVFilterPicRef *ref)
{
    if(-- ref->pic->refcount == 0)
        ref->pic->free(ref->pic);
    av_free(ref);
}

void avfilter_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
                         AVFilterPad **pads, AVFilterLink ***links,
                         AVFilterPad *newpad)
{
    unsigned i;

    idx = FFMIN(idx, *count);

    *pads  = av_realloc(*pads,  sizeof(AVFilterPad)   * (*count + 1));
    *links = av_realloc(*links, sizeof(AVFilterLink*) * (*count + 1));
    memmove(*pads +idx+1, *pads +idx, sizeof(AVFilterPad)   * (*count-idx));
    memmove(*links+idx+1, *links+idx, sizeof(AVFilterLink*) * (*count-idx));
    memcpy(*pads+idx, newpad, sizeof(AVFilterPad));
    (*links)[idx] = NULL;

    (*count) ++;
    for(i = idx+1; i < *count; i ++)
        if(*links[i])
            (*(unsigned *)((uint8_t *)(*links[i]) + padidx_off)) ++;
}

int avfilter_link(AVFilterContext *src, unsigned srcpad,
                  AVFilterContext *dst, unsigned dstpad)
{
    AVFilterLink *link;

    if(src->output_count <= srcpad || dst->input_count <= dstpad ||
       src->outputs[srcpad]        || dst->inputs[dstpad])
        return -1;

    src->outputs[srcpad] =
    dst->inputs[dstpad]  = link = av_mallocz(sizeof(AVFilterLink));

    link->src     = src;
    link->dst     = dst;
    link->srcpad  = srcpad;
    link->dstpad  = dstpad;
    link->format  = -1;

    return 0;
}

int avfilter_insert_filter(AVFilterLink *link, AVFilterContext *filt,
                           unsigned in, unsigned out)
{
    AVFilterFormats *formats;

    av_log(NULL, AV_LOG_INFO, "auto-inserting filter '%s'\n",
            filt->filter->name);

    link->dst->inputs[link->dstpad] = NULL;
    if(avfilter_link(filt, out, link->dst, link->dstpad)) {
        /* failed to link output filter to new filter */
        link->dst->inputs[link->dstpad] = link;
        return -1;
    }

    /* re-hookup the link to the new destination filter we inserted */
    link->dst = filt;
    link->dstpad = in;
    filt->inputs[in] = link;

    /* if any information on supported colorspaces already exists on the
     * link, we need to preserve that */
    if((formats = link->out_formats))
        avfilter_formats_changeref(&link->out_formats,
                                   &filt->outputs[out]->out_formats);

    return 0;
}

int avfilter_config_link(AVFilterLink *link)
{
    int (*config_link)(AVFilterLink *);

    if(!link)
        return 0;

    if(!(config_link = link_spad(link).config_props))
        config_link  = avfilter_default_config_output_link;
    if(config_link(link))
            return -1;

    if(!(config_link = link_dpad(link).config_props))
        config_link  = avfilter_default_config_input_link;
    if(config_link(link))
            return -1;

    return 0;
}

AVFilterPicRef *avfilter_get_video_buffer(AVFilterLink *link, int perms)
{
    AVFilterPicRef *ret = NULL;

    if(link_dpad(link).get_video_buffer)
        ret = link_dpad(link).get_video_buffer(link, perms);

    if(!ret)
        ret = avfilter_default_get_video_buffer(link, perms);

    return ret;
}

int avfilter_request_frame(AVFilterLink *link)
{
    if(link_spad(link).request_frame)
        return link_spad(link).request_frame(link);
    else if(link->src->inputs[0])
        return avfilter_request_frame(link->src->inputs[0]);
    else return -1;
}

/* 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 *);

    if(!(start_frame = link_dpad(link).start_frame))
        start_frame = avfilter_default_start_frame;

    /* prepare to copy the picture if it has insufficient permissions */
    if((link_dpad(link).min_perms & picref->perms) != link_dpad(link).min_perms ||
        link_dpad(link).rej_perms & picref->perms) {
        av_log(link->dst, AV_LOG_INFO,
                "frame copy needed (have perms %x, need %x, reject %x)\n",
                picref->perms,
                link_dpad(link).min_perms, link_dpad(link).rej_perms);

        link->cur_pic = avfilter_default_get_video_buffer(link, link_dpad(link).min_perms);
        link->srcpic = picref;
    }
    else
        link->cur_pic = picref;

    start_frame(link, link->cur_pic);
}

void avfilter_end_frame(AVFilterLink *link)
{
    void (*end_frame)(AVFilterLink *);

    /* unreference the source picture if we're feeding the destination filter
     * a copied version dues to permission issues */
    if(link->srcpic) {
        avfilter_unref_pic(link->srcpic);
        link->srcpic = NULL;
    }

    if(!(end_frame = link_dpad(link).end_frame))
        end_frame = avfilter_default_end_frame;

    end_frame(link);
}

void avfilter_draw_slice(AVFilterLink *link, int y, int h)
{
    uint8_t *src[4], *dst[4];
    int i, j, hsub, vsub;

    /* copy the slice if needed for permission reasons */
    if(link->srcpic) {
        avcodec_get_chroma_sub_sample(link->format, &hsub, &vsub);

        src[0] = link->srcpic-> data[0] + y * link->srcpic-> linesize[0];
        dst[0] = link->cur_pic->data[0] + y * link->cur_pic->linesize[0];
        for(i = 1; i < 4; i ++) {
            if(link->srcpic->data[i]) {
                src[i] = link->srcpic-> data[i] + (y >> vsub) * link->srcpic-> linesize[i];
                dst[i] = link->cur_pic->data[i] + (y >> vsub) * link->cur_pic->linesize[i];
            } else
                src[i] = dst[i] = NULL;
        }
        for(j = 0; j < h; j ++) {
            memcpy(dst[0], src[0], link->cur_pic->linesize[0]);
            src[0] += link->srcpic ->linesize[0];
            dst[0] += link->cur_pic->linesize[0];
        }
        for(i = 1; i < 4; i ++) {
            if(!src[i]) continue;

            for(j = 0; j < h >> vsub; j ++) {
                memcpy(dst[i], src[i], link->cur_pic->linesize[i]);
                src[i] += link->srcpic ->linesize[i];
                dst[i] += link->cur_pic->linesize[i];
            }
        }
    }

    if(!link_dpad(link).draw_slice)
        return;

    link_dpad(link).draw_slice(link, y, h);
}

AVFilter *avfilter_get_by_name(char *name)
{
    struct FilterList *filt;

    for(filt = filters; filt; filt = filt->next)
        if(!strcmp(filt->filter->name, name))
            return filt->filter;

    return NULL;
}

void avfilter_register(AVFilter *filter)
{
    struct FilterList *newfilt = av_malloc(sizeof(struct FilterList));

    newfilt->filter = filter;
    newfilt->next   = filters;
    filters         = newfilt;
}

void avfilter_init(void)
{
    avfilter_register(&avfilter_vf_crop);
    avfilter_register(&avfilter_vf_fifo);
    avfilter_register(&avfilter_vf_fps);
    avfilter_register(&avfilter_vf_graph);
    avfilter_register(&avfilter_vf_graphdesc);
    avfilter_register(&avfilter_vf_graphfile);
    avfilter_register(&avfilter_vf_hflip);
    avfilter_register(&avfilter_vf_negate);
    avfilter_register(&avfilter_vf_overlay);
    avfilter_register(&avfilter_vf_passthrough);
    avfilter_register(&avfilter_vf_scale);
    avfilter_register(&avfilter_vf_slicify);
    avfilter_register(&avfilter_vf_split);
    avfilter_register(&avfilter_vf_vflip);
}

void avfilter_uninit(void)
{
    struct FilterList *tmp;

    for(; filters; filters = tmp) {
        tmp = filters->next;
        av_free(filters);
    }
}

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_open(AVFilter *filter, char *inst_name)
{
    AVFilterContext *ret;

    if (!filter)
        return 0;

    ret = av_malloc(sizeof(AVFilterContext));

    ret->av_class = av_mallocz(sizeof(AVClass));
    ret->av_class->item_name = filter_name;
    ret->filter   = filter;
    ret->name     = inst_name ? av_strdup(inst_name) : NULL;
    ret->priv     = av_mallocz(filter->priv_size);

    ret->input_count  = pad_count(filter->inputs);
    ret->input_pads   = av_malloc(sizeof(AVFilterPad) * ret->input_count);
    memcpy(ret->input_pads, filter->inputs, sizeof(AVFilterPad)*ret->input_count);
    ret->inputs       = av_mallocz(sizeof(AVFilterLink*) * ret->input_count);

    ret->output_count = pad_count(filter->outputs);
    ret->output_pads  = av_malloc(sizeof(AVFilterPad) * ret->output_count);
    memcpy(ret->output_pads, filter->outputs, sizeof(AVFilterPad)*ret->output_count);
    ret->outputs      = av_mallocz(sizeof(AVFilterLink*) * ret->output_count);

    return ret;
}

void avfilter_destroy(AVFilterContext *filter)
{
    int i;

    if(filter->filter->uninit)
        filter->filter->uninit(filter);

    for(i = 0; i < filter->input_count; i ++) {
        if(filter->inputs[i])
            filter->inputs[i]->src->outputs[filter->inputs[i]->srcpad] = NULL;
        av_freep(&filter->inputs[i]);
    }
    for(i = 0; i < filter->output_count; i ++) {
        if(filter->outputs[i])
            filter->outputs[i]->dst->inputs[filter->outputs[i]->dstpad] = NULL;
        av_freep(&filter->outputs[i]);
    }

    av_freep(&filter->name);
    av_freep(&filter->input_pads);
    av_freep(&filter->output_pads);
    av_freep(&filter->inputs);
    av_freep(&filter->outputs);
    av_freep(&filter->priv);
    av_freep(&filter->av_class);
    av_free(filter);
}

int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque)
{
    int ret;

    if(filter->filter->init)
        if((ret = filter->filter->init(filter, args, opaque))) return ret;
    return 0;
}
Commit	Line	Data
4dbbcdee VS	1	/*
	2	* Filter layer
	3	* copyright (c) 2007 Bobby Bingham
	4	*
	5	* This file is part of FFmpeg.
	6	*
	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.
	11	*
	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.
	16	*
	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
	20	*/
	21
e0752603	22	#include <stdarg.h>
4dbbcdee VS	23	#include <stdlib.h>
	24	#include <string.h>
	25	#include <stdio.h>
	26
	27	#include "avfilter.h"
d72a138e	28	#include "allfilters.h"
4dbbcdee	29
6d8c67a7 VS	30	/** list of registered filters */
	31	struct FilterList
	32	{
	33	AVFilter *filter;
	34	struct FilterList *next;
	35	} *filters = NULL;
4dbbcdee	36
6fb0648d VS	37	/** helper macros to get the in/out pad on the dst/src filter */
	38	#define link_dpad(link) link->dst-> input_pads[link->dstpad]
	39	#define link_spad(link) link->src->output_pads[link->srcpad]
	40
269b9847	41	AVFilterPicRef avfilter_ref_pic(AVFilterPicRef ref, int pmask)
4dbbcdee VS	42	{
4dbbcdee VS	43	AVFilterPicRef *ret = av_malloc(sizeof(AVFilterPicRef));
cdf2a332	44	ret = ref;
efb36bfc	45	ret->perms &= pmask;
4dbbcdee VS	46	ret->pic->refcount ++;
	47	return ret;
	48	}
	49
	50	void avfilter_unref_pic(AVFilterPicRef *ref)
	51	{
269b9847	52	if(-- ref->pic->refcount == 0)
4dbbcdee VS	53	ref->pic->free(ref->pic);
	54	av_free(ref);
	55	}
	56
24618441 VS	57	void avfilter_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
	58	AVFilterPad pads, AVFilterLink *links,
	59	AVFilterPad *newpad)
	60	{
	61	unsigned i;
	62
	63	idx = FFMIN(idx, *count);
	64
	65	pads = av_realloc(pads, sizeof(AVFilterPad) * (*count + 1));
	66	links = av_realloc(links, sizeof(AVFilterLink) (*count + 1));
	67	memmove(pads +idx+1, pads +idx, sizeof(AVFilterPad) * (*count-idx));
	68	memmove(links+idx+1, links+idx, sizeof(AVFilterLink) (*count-idx));
	69	memcpy(*pads+idx, newpad, sizeof(AVFilterPad));
	70	(*links)[idx] = NULL;
	71
	72	(*count) ++;
	73	for(i = idx+1; i < *count; i ++)
	74	if(*links[i])
	75	((unsigned )((uint8_t )(links[i]) + padidx_off)) ++;
	76	}
	77
4dbbcdee VS	78	int avfilter_link(AVFilterContext *src, unsigned srcpad,
	79	AVFilterContext *dst, unsigned dstpad)
	80	{
	81	AVFilterLink *link;
	82
7d0e1392 VS	83	if(src->output_count <= srcpad \|\| dst->input_count <= dstpad \|\|
7d0e1392 VS	84	src->outputs[srcpad] \|\| dst->inputs[dstpad])
4dbbcdee VS	85	return -1;
	86
	87	src->outputs[srcpad] =
c949d867	88	dst->inputs[dstpad] = link = av_mallocz(sizeof(AVFilterLink));
4dbbcdee	89
1653c11f VS	90	link->src = src;
	91	link->dst = dst;
	92	link->srcpad = srcpad;
	93	link->dstpad = dstpad;
01942f1d VS	94	link->format = -1;
	95
	96	return 0;
	97	}
	98
52362e9d VS	99	int avfilter_insert_filter(AVFilterLink link, AVFilterContext filt,
	100	unsigned in, unsigned out)
	101	{
e3065c8b VS	102	AVFilterFormats *formats;
e3065c8b VS	103
52362e9d VS	104	av_log(NULL, AV_LOG_INFO, "auto-inserting filter '%s'\n",
	105	filt->filter->name);
	106
	107	link->dst->inputs[link->dstpad] = NULL;
	108	if(avfilter_link(filt, out, link->dst, link->dstpad)) {
	109	/* failed to link output filter to new filter */
	110	link->dst->inputs[link->dstpad] = link;
	111	return -1;
	112	}
	113
	114	/* re-hookup the link to the new destination filter we inserted */
	115	link->dst = filt;
	116	link->dstpad = in;
	117	filt->inputs[in] = link;
	118
07d0bba5 VS	119	/* if any information on supported colorspaces already exists on the
07d0bba5 VS	120	* link, we need to preserve that */
e3065c8b VS	121	if((formats = link->out_formats))
	122	avfilter_formats_changeref(&link->out_formats,
	123	&filt->outputs[out]->out_formats);
07d0bba5	124
52362e9d VS	125	return 0;
	126	}
	127
01942f1d VS	128	int avfilter_config_link(AVFilterLink *link)
01942f1d VS	129	{
01942f1d	130	int (config_link)(AVFilterLink );
d21cbbff	131
01942f1d VS	132	if(!link)
01942f1d VS	133	return 0;
4dbbcdee	134
6fb0648d	135	if(!(config_link = link_spad(link).config_props))
01942f1d VS	136	config_link = avfilter_default_config_output_link;
	137	if(config_link(link))
	138	return -1;
102fb0e3	139
6fb0648d	140	if(!(config_link = link_dpad(link).config_props))
01942f1d VS	141	config_link = avfilter_default_config_input_link;
	142	if(config_link(link))
	143	return -1;
102fb0e3	144
4dbbcdee VS	145	return 0;
	146	}
	147
	148	AVFilterPicRef avfilter_get_video_buffer(AVFilterLink link, int perms)
	149	{
	150	AVFilterPicRef *ret = NULL;
	151
6fb0648d VS	152	if(link_dpad(link).get_video_buffer)
6fb0648d VS	153	ret = link_dpad(link).get_video_buffer(link, perms);
4dbbcdee VS	154
	155	if(!ret)
	156	ret = avfilter_default_get_video_buffer(link, perms);
	157
	158	return ret;
	159	}
	160
3306f8bd	161	int avfilter_request_frame(AVFilterLink *link)
4dbbcdee	162	{
6fb0648d VS	163	if(link_spad(link).request_frame)
6fb0648d VS	164	return link_spad(link).request_frame(link);
9586ba3a	165	else if(link->src->inputs[0])
3306f8bd VS	166	return avfilter_request_frame(link->src->inputs[0]);
3306f8bd VS	167	else return -1;
4dbbcdee VS	168	}
	169
	170	/* XXX: should we do the duplicating of the picture ref here, instead of
	171	* forcing the source filter to do it? */
	172	void avfilter_start_frame(AVFilterLink link, AVFilterPicRef picref)
	173	{
	174	void (start_frame)(AVFilterLink , AVFilterPicRef *);
	175
e675dccd	176	if(!(start_frame = link_dpad(link).start_frame))
4dbbcdee VS	177	start_frame = avfilter_default_start_frame;
4dbbcdee VS	178
c949d867	179	/* prepare to copy the picture if it has insufficient permissions */
269b9847 VS	180	if((link_dpad(link).min_perms & picref->perms) != link_dpad(link).min_perms \|\|
269b9847 VS	181	link_dpad(link).rej_perms & picref->perms) {
c949d867 VS	182	av_log(link->dst, AV_LOG_INFO,
c949d867 VS	183	"frame copy needed (have perms %x, need %x, reject %x)\n",
269b9847	184	picref->perms,
c949d867 VS	185	link_dpad(link).min_perms, link_dpad(link).rej_perms);
	186
	187	link->cur_pic = avfilter_default_get_video_buffer(link, link_dpad(link).min_perms);
	188	link->srcpic = picref;
	189	}
	190	else
	191	link->cur_pic = picref;
	192
	193	start_frame(link, link->cur_pic);
4dbbcdee VS	194	}
	195
	196	void avfilter_end_frame(AVFilterLink *link)
	197	{
	198	void (end_frame)(AVFilterLink );
	199
c949d867 VS	200	/* unreference the source picture if we're feeding the destination filter
	201	* a copied version dues to permission issues */
	202	if(link->srcpic) {
	203	avfilter_unref_pic(link->srcpic);
	204	link->srcpic = NULL;
	205	}
	206
e675dccd	207	if(!(end_frame = link_dpad(link).end_frame))
4dbbcdee VS	208	end_frame = avfilter_default_end_frame;
	209
	210	end_frame(link);
	211	}
	212
ef35d13a	213	void avfilter_draw_slice(AVFilterLink *link, int y, int h)
4dbbcdee	214	{
c949d867 VS	215	uint8_t src[4], dst[4];
	216	int i, j, hsub, vsub;
	217
	218	/* copy the slice if needed for permission reasons */
	219	if(link->srcpic) {
	220	avcodec_get_chroma_sub_sample(link->format, &hsub, &vsub);
	221
	222	src[0] = link->srcpic-> data[0] + y * link->srcpic-> linesize[0];
	223	dst[0] = link->cur_pic->data[0] + y * link->cur_pic->linesize[0];
	224	for(i = 1; i < 4; i ++) {
	225	if(link->srcpic->data[i]) {
	226	src[i] = link->srcpic-> data[i] + (y >> vsub) * link->srcpic-> linesize[i];
	227	dst[i] = link->cur_pic->data[i] + (y >> vsub) * link->cur_pic->linesize[i];
	228	} else
	229	src[i] = dst[i] = NULL;
	230	}
	231	for(j = 0; j < h; j ++) {
	232	memcpy(dst[0], src[0], link->cur_pic->linesize[0]);
	233	src[0] += link->srcpic ->linesize[0];
	234	dst[0] += link->cur_pic->linesize[0];
	235	}
	236	for(i = 1; i < 4; i ++) {
	237	if(!src[i]) continue;
	238
	239	for(j = 0; j < h >> vsub; j ++) {
	240	memcpy(dst[i], src[i], link->cur_pic->linesize[i]);
	241	src[i] += link->srcpic ->linesize[i];
	242	dst[i] += link->cur_pic->linesize[i];
	243	}
	244	}
	245	}
	246
6fb0648d	247	if(!link_dpad(link).draw_slice)
7d0e1392 VS	248	return;
7d0e1392 VS	249
6fb0648d	250	link_dpad(link).draw_slice(link, y, h);
4dbbcdee VS	251	}
4dbbcdee VS	252
4dbbcdee VS	253	AVFilter avfilter_get_by_name(char name)
4dbbcdee VS	254	{
6d8c67a7 VS	255	struct FilterList *filt;
	256
	257	for(filt = filters; filt; filt = filt->next)
	258	if(!strcmp(filt->filter->name, name))
	259	return filt->filter;
4dbbcdee	260
4dbbcdee VS	261	return NULL;
	262	}
	263
4dbbcdee VS	264	void avfilter_register(AVFilter *filter)
4dbbcdee VS	265	{
6d8c67a7 VS	266	struct FilterList *newfilt = av_malloc(sizeof(struct FilterList));
	267
	268	newfilt->filter = filter;
	269	newfilt->next = filters;
	270	filters = newfilt;
4dbbcdee VS	271	}
	272
	273	void avfilter_init(void)
	274	{
7bce27a3 VS	275	avfilter_register(&avfilter_vf_crop);
	276	avfilter_register(&avfilter_vf_fifo);
	277	avfilter_register(&avfilter_vf_fps);
	278	avfilter_register(&avfilter_vf_graph);
	279	avfilter_register(&avfilter_vf_graphdesc);
	280	avfilter_register(&avfilter_vf_graphfile);
c35a0473	281	avfilter_register(&avfilter_vf_hflip);
f9033975	282	avfilter_register(&avfilter_vf_negate);
7bce27a3 VS	283	avfilter_register(&avfilter_vf_overlay);
7bce27a3 VS	284	avfilter_register(&avfilter_vf_passthrough);
2a553ef5	285	avfilter_register(&avfilter_vf_scale);
7bce27a3 VS	286	avfilter_register(&avfilter_vf_slicify);
	287	avfilter_register(&avfilter_vf_split);
	288	avfilter_register(&avfilter_vf_vflip);
4dbbcdee VS	289	}
	290
	291	void avfilter_uninit(void)
	292	{
6d8c67a7 VS	293	struct FilterList *tmp;
	294
	295	for(; filters; filters = tmp) {
	296	tmp = filters->next;
	297	av_free(filters);
	298	}
4dbbcdee VS	299	}
	300
	301	static int pad_count(const AVFilterPad *pads)
	302	{
	303	AVFilterPad p = (AVFilterPad ) pads;
	304	int count;
	305
	306	for(count = 0; p->name; count ++) p ++;
	307	return count;
	308	}
	309
	310	static const char filter_name(void p)
	311	{
	312	AVFilterContext *filter = p;
	313	return filter->filter->name;
	314	}
	315
44b73497	316	AVFilterContext avfilter_open(AVFilter filter, char *inst_name)
4dbbcdee	317	{
8f618f4c VS	318	AVFilterContext *ret;
	319
	320	if (!filter)
	321	return 0;
	322
	323	ret = av_malloc(sizeof(AVFilterContext));
4dbbcdee VS	324
	325	ret->av_class = av_mallocz(sizeof(AVClass));
	326	ret->av_class->item_name = filter_name;
	327	ret->filter = filter;
2350e69c	328	ret->name = inst_name ? av_strdup(inst_name) : NULL;
4dbbcdee VS	329	ret->priv = av_mallocz(filter->priv_size);
4dbbcdee VS	330
7d0e1392	331	ret->input_count = pad_count(filter->inputs);
c5ef7d7b VS	332	ret->input_pads = av_malloc(sizeof(AVFilterPad) * ret->input_count);
c5ef7d7b VS	333	memcpy(ret->input_pads, filter->inputs, sizeof(AVFilterPad)*ret->input_count);
7d0e1392	334	ret->inputs = av_mallocz(sizeof(AVFilterLink) ret->input_count);
c5ef7d7b	335
7d0e1392	336	ret->output_count = pad_count(filter->outputs);
c5ef7d7b VS	337	ret->output_pads = av_malloc(sizeof(AVFilterPad) * ret->output_count);
c5ef7d7b VS	338	memcpy(ret->output_pads, filter->outputs, sizeof(AVFilterPad)*ret->output_count);
7d0e1392 VS	339	ret->outputs = av_mallocz(sizeof(AVFilterLink) ret->output_count);
7d0e1392 VS	340
4dbbcdee VS	341	return ret;
	342	}
	343
	344	void avfilter_destroy(AVFilterContext *filter)
	345	{
	346	int i;
	347
	348	if(filter->filter->uninit)
	349	filter->filter->uninit(filter);
	350
c5ef7d7b	351	for(i = 0; i < filter->input_count; i ++) {
4dbbcdee VS	352	if(filter->inputs[i])
4dbbcdee VS	353	filter->inputs[i]->src->outputs[filter->inputs[i]->srcpad] = NULL;
f4cb4462	354	av_freep(&filter->inputs[i]);
4dbbcdee	355	}
c5ef7d7b	356	for(i = 0; i < filter->output_count; i ++) {
4dbbcdee VS	357	if(filter->outputs[i])
4dbbcdee VS	358	filter->outputs[i]->dst->inputs[filter->outputs[i]->dstpad] = NULL;
f4cb4462	359	av_freep(&filter->outputs[i]);
4dbbcdee VS	360	}
4dbbcdee VS	361
f4cb4462 VS	362	av_freep(&filter->name);
	363	av_freep(&filter->input_pads);
	364	av_freep(&filter->output_pads);
	365	av_freep(&filter->inputs);
	366	av_freep(&filter->outputs);
	367	av_freep(&filter->priv);
	368	av_freep(&filter->av_class);
4dbbcdee VS	369	av_free(filter);
	370	}
	371
a360f71e	372	int avfilter_init_filter(AVFilterContext filter, const char args, void *opaque)
4dbbcdee	373	{
c6b0aa68	374	int ret;
4dbbcdee VS	375
4dbbcdee VS	376	if(filter->filter->init)
a360f71e	377	if((ret = filter->filter->init(filter, args, opaque))) return ret;
4dbbcdee VS	378	return 0;
	379	}
	380