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ffmpeg / libavfilter / avfilter.c @ 8f618f4c

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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 <stdarg.h>
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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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#include "allfilters.h"
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/** list of registered filters */
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struct FilterList
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{
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    AVFilter *filter;
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    struct FilterList *next;
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} *filters = NULL;
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/** helper macros to get the in/out pad on the dst/src filter */
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#define link_dpad(link)     link->dst-> input_pads[link->dstpad]
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#define link_spad(link)     link->src->output_pads[link->srcpad]
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AVFilterPicRef *avfilter_ref_pic(AVFilterPicRef *ref, int pmask)
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{
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    AVFilterPicRef *ret = av_malloc(sizeof(AVFilterPicRef));
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    *ret = *ref;
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    ret->perms &= pmask;
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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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void avfilter_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
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                         AVFilterPad **pads, AVFilterLink ***links,
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                         AVFilterPad *newpad)
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{
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    unsigned i;
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    idx = FFMIN(idx, *count);
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    *pads  = av_realloc(*pads,  sizeof(AVFilterPad)   * (*count + 1));
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    *links = av_realloc(*links, sizeof(AVFilterLink*) * (*count + 1));
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    memmove(*pads +idx+1, *pads +idx, sizeof(AVFilterPad)   * (*count-idx));
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    memmove(*links+idx+1, *links+idx, sizeof(AVFilterLink*) * (*count-idx));
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    memcpy(*pads+idx, newpad, sizeof(AVFilterPad));
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    (*links)[idx] = NULL;
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    (*count) ++;
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    for(i = idx+1; i < *count; i ++)
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        if(*links[i])
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            (*(unsigned *)((uint8_t *)(*links[i]) + padidx_off)) ++;
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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->output_count <= srcpad || dst->input_count <= dstpad ||
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       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_mallocz(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->format  = -1;
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    return 0;
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}
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static int common_format(int *fmts0, int *fmts1)
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{
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    int i, j;
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    for(i = 0; fmts0[i] != -1; i ++)
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        for(j = 0; fmts1[j] != -1; j ++)
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            if(fmts0[i] == fmts1[j])
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                return fmts0[i];
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    return -1;
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}
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int avfilter_config_link(AVFilterLink *link)
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{
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    int *fmts[3] = {NULL,NULL,NULL};
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    int (*config_link)(AVFilterLink *);
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    int *(*query_formats)(AVFilterLink *link);
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    AVFilterContext *scale;
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    AVFilterLink *link2 = NULL;
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    if(!link)
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        return 0;
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    /* find a format both filters support */
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    if(!(query_formats = link_spad(link).query_formats))
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        query_formats = avfilter_default_query_output_formats;
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    fmts[0] = query_formats(link);
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    fmts[1] = link_dpad(link).query_formats(link);
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    if((link->format = common_format(fmts[0], fmts[1])) == -1) {
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        /* no common format found.  insert scale filter to convert */
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        if(!(scale = avfilter_open(&avfilter_vf_scale, NULL)))
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            goto format_done;
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        if(scale->filter->init(scale, NULL, NULL)) {
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            avfilter_destroy(scale);
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            goto format_done;
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        }
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        link->dst->inputs[link->dstpad] = NULL;
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        if(avfilter_link(scale, 0, link->dst, link->dstpad)) {
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            link->dst->inputs[link->dstpad] = link;
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            goto format_done;
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        }
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        link2 = scale->outputs[0];
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        link->dst    = scale;
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        link->dstpad = 0;
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        scale->inputs[0] = link;
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        /* now try again to find working colorspaces.
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         * XXX: is it safe to assume that the scale filter always supports the
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         * same input and output colorspaces? */
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        fmts[2] = scale->input_pads[0].query_formats(link);
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        link->format  = common_format(fmts[0], fmts[2]);
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        link2->format = common_format(fmts[1], fmts[2]);
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    }
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format_done:
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    av_free(fmts[0]);
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    av_free(fmts[1]);
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    av_free(fmts[2]);
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    if(link->format == -1 || (link2 && link2->format == -1)) {
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        if(link2) {
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            link->dst    = link2->dst;
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            link->dstpad = link2->dstpad;
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            link->dst->inputs[link->dstpad] = link;
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            link->format = -1;
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            avfilter_destroy(scale);
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            av_free(link2);
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        }
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        return -1;
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    }
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    if(!(config_link = link_spad(link).config_props))
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        config_link  = avfilter_default_config_output_link;
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    if(config_link(link))
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            return -1;
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    if(!(config_link = link_dpad(link).config_props))
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        config_link  = avfilter_default_config_input_link;
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    if(config_link(link))
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            return -1;
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    if(link2) {
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        if(!(config_link = link_spad(link2).config_props))
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            config_link  = avfilter_default_config_output_link;
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        if(config_link(link2))
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                return -1;
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        if(!(config_link = link_dpad(link2).config_props))
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            config_link  = avfilter_default_config_input_link;
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        if(config_link(link2))
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                return -1;
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    }
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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_dpad(link).get_video_buffer)
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        ret = link_dpad(link).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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int avfilter_request_frame(AVFilterLink *link)
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{
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    if(link_spad(link).request_frame)
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        return link_spad(link).request_frame(link);
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    else if(link->src->inputs[0])
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        return avfilter_request_frame(link->src->inputs[0]);
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    else return -1;
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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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    if(!(start_frame = link_dpad(link).start_frame))
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        start_frame = avfilter_default_start_frame;
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    /* prepare to copy the picture if it has insufficient permissions */
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    if((link_dpad(link).min_perms & picref->perms) != link_dpad(link).min_perms ||
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        link_dpad(link).rej_perms & picref->perms) {
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        av_log(link->dst, AV_LOG_INFO,
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                "frame copy needed (have perms %x, need %x, reject %x)\n",
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                picref->perms,
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                link_dpad(link).min_perms, link_dpad(link).rej_perms);
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        link->cur_pic = avfilter_default_get_video_buffer(link, link_dpad(link).min_perms);
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        link->srcpic = picref;
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    }
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    else
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        link->cur_pic = picref;
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    start_frame(link, link->cur_pic);
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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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    /* unreference the source picture if we're feeding the destination filter
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     * a copied version dues to permission issues */
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    if(link->srcpic) {
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        avfilter_unref_pic(link->srcpic);
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        link->srcpic = NULL;
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    }
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    if(!(end_frame = link_dpad(link).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, int y, int h)
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{
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    uint8_t *src[4], *dst[4];
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    int i, j, hsub, vsub;
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    /* copy the slice if needed for permission reasons */
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    if(link->srcpic) {
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        avcodec_get_chroma_sub_sample(link->format, &hsub, &vsub);
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        src[0] = link->srcpic-> data[0] + y * link->srcpic-> linesize[0];
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        dst[0] = link->cur_pic->data[0] + y * link->cur_pic->linesize[0];
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        for(i = 1; i < 4; i ++) {
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            if(link->srcpic->data[i]) {
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                src[i] = link->srcpic-> data[i] + (y >> vsub) * link->srcpic-> linesize[i];
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                dst[i] = link->cur_pic->data[i] + (y >> vsub) * link->cur_pic->linesize[i];
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            } else
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                src[i] = dst[i] = NULL;
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        }
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        for(j = 0; j < h; j ++) {
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            memcpy(dst[0], src[0], link->cur_pic->linesize[0]);
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            src[0] += link->srcpic ->linesize[0];
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            dst[0] += link->cur_pic->linesize[0];
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        }
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        for(i = 1; i < 4; i ++) {
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            if(!src[i]) continue;
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            for(j = 0; j < h >> vsub; j ++) {
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                memcpy(dst[i], src[i], link->cur_pic->linesize[i]);
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                src[i] += link->srcpic ->linesize[i];
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                dst[i] += link->cur_pic->linesize[i];
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            }
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        }
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    }
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    if(!link_dpad(link).draw_slice)
296
        return;
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    link_dpad(link).draw_slice(link, y, h);
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}
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AVFilter *avfilter_get_by_name(char *name)
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{
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    struct FilterList *filt;
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    for(filt = filters; filt; filt = filt->next)
306
        if(!strcmp(filt->filter->name, name))
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            return filt->filter;
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    return NULL;
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}
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/* FIXME: insert in order, rather than insert at end + resort */
313
void avfilter_register(AVFilter *filter)
314
{
315
    struct FilterList *newfilt = av_malloc(sizeof(struct FilterList));
316

    
317
    newfilt->filter = filter;
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    newfilt->next   = filters;
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    filters         = newfilt;
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}
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void avfilter_init(void)
323
{
324
    avfilter_register(&avfilter_vf_crop);
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    avfilter_register(&avfilter_vf_fifo);
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    avfilter_register(&avfilter_vf_fps);
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    avfilter_register(&avfilter_vf_graph);
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    avfilter_register(&avfilter_vf_graphdesc);
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    avfilter_register(&avfilter_vf_graphfile);
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    avfilter_register(&avfilter_vf_negate);
331
    avfilter_register(&avfilter_vf_overlay);
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    avfilter_register(&avfilter_vf_passthrough);
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    avfilter_register(&avfilter_vf_scale);
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    avfilter_register(&avfilter_vf_slicify);
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    avfilter_register(&avfilter_vf_split);
336
    avfilter_register(&avfilter_vf_vflip);
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}
338

    
339
void avfilter_uninit(void)
340
{
341
    struct FilterList *tmp;
342

    
343
    for(; filters; filters = tmp) {
344
        tmp = filters->next;
345
        av_free(filters);
346
    }
347
}
348

    
349
static int pad_count(const AVFilterPad *pads)
350
{
351
    AVFilterPad *p = (AVFilterPad *) pads;
352
    int count;
353

    
354
    for(count = 0; p->name; count ++) p ++;
355
    return count;
356
}
357

    
358
static const char *filter_name(void *p)
359
{
360
    AVFilterContext *filter = p;
361
    return filter->filter->name;
362
}
363

    
364
AVFilterContext *avfilter_open(AVFilter *filter, char *inst_name)
365
{
366
    AVFilterContext *ret;
367

    
368
    if (!filter)
369
        return 0;
370

    
371
    ret = av_malloc(sizeof(AVFilterContext));
372

    
373
    ret->av_class = av_mallocz(sizeof(AVClass));
374
    ret->av_class->item_name = filter_name;
375
    ret->filter   = filter;
376
    ret->name     = inst_name ? av_strdup(inst_name) : NULL;
377
    ret->priv     = av_mallocz(filter->priv_size);
378

    
379
    ret->input_count  = pad_count(filter->inputs);
380
    ret->input_pads   = av_malloc(sizeof(AVFilterPad) * ret->input_count);
381
    memcpy(ret->input_pads, filter->inputs, sizeof(AVFilterPad)*ret->input_count);
382
    ret->inputs       = av_mallocz(sizeof(AVFilterLink*) * ret->input_count);
383

    
384
    ret->output_count = pad_count(filter->outputs);
385
    ret->output_pads  = av_malloc(sizeof(AVFilterPad) * ret->output_count);
386
    memcpy(ret->output_pads, filter->outputs, sizeof(AVFilterPad)*ret->output_count);
387
    ret->outputs      = av_mallocz(sizeof(AVFilterLink*) * ret->output_count);
388

    
389
    return ret;
390
}
391

    
392
void avfilter_destroy(AVFilterContext *filter)
393
{
394
    int i;
395

    
396
    if(filter->filter->uninit)
397
        filter->filter->uninit(filter);
398

    
399
    for(i = 0; i < filter->input_count; i ++) {
400
        if(filter->inputs[i])
401
            filter->inputs[i]->src->outputs[filter->inputs[i]->srcpad] = NULL;
402
        av_freep(&filter->inputs[i]);
403
    }
404
    for(i = 0; i < filter->output_count; i ++) {
405
        if(filter->outputs[i])
406
            filter->outputs[i]->dst->inputs[filter->outputs[i]->dstpad] = NULL;
407
        av_freep(&filter->outputs[i]);
408
    }
409

    
410
    av_freep(&filter->name);
411
    av_freep(&filter->input_pads);
412
    av_freep(&filter->output_pads);
413
    av_freep(&filter->inputs);
414
    av_freep(&filter->outputs);
415
    av_freep(&filter->priv);
416
    av_freep(&filter->av_class);
417
    av_free(filter);
418
}
419

    
420
int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque)
421
{
422
    int ret;
423

    
424
    if(filter->filter->init)
425
        if((ret = filter->filter->init(filter, args, opaque))) return ret;
426
    return 0;
427
}
428

    
429
int *avfilter_make_format_list(int len, ...)
430
{
431
    int *ret, i;
432
    va_list vl;
433

    
434
    ret = av_malloc(sizeof(int) * (len + 1));
435
    va_start(vl, len);
436
    for(i = 0; i < len; i ++)
437
        ret[i] = va_arg(vl, int);
438
    va_end(vl);
439
    ret[len] = -1;
440

    
441
    return ret;
442
}
443