Revision bf4ce7a3

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libavfilter/defaults.c
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/*
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 * Filter layer - default implementations
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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 "avfilter.h"
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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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    memcpy(ref->data,     pic->data,     sizeof(pic->data));
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    memcpy(ref->linesize, pic->linesize, sizeof(pic->linesize));
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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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    AVFilterLink *out = NULL;
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    if(link->dst->output_count)
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        out = link->dst->outputs[0];
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    link->cur_pic = picref;
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    if(out) {
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        out->outpic      = avfilter_get_video_buffer(out, AV_PERM_WRITE);
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        out->outpic->pts = picref->pts;
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        avfilter_start_frame(out, avfilter_ref_pic(out->outpic, ~0));
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    }
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}
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void avfilter_default_end_frame(AVFilterLink *link)
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{
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    AVFilterLink *out = NULL;
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    if(link->dst->output_count)
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        out = link->dst->outputs[0];
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    avfilter_unref_pic(link->cur_pic);
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    link->cur_pic = NULL;
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    if(out) {
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        avfilter_unref_pic(out->outpic);
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        out->outpic = NULL;
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        avfilter_end_frame(out);
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    }
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}
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/**
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 * default config_link() implementation for output video links to simplify
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 * the implementation of one input one output video filters */
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int avfilter_default_config_output_link(AVFilterLink *link)
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{
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    if(link->src->input_count && link->src->inputs[0]) {
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        link->w = link->src->inputs[0]->w;
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        link->h = link->src->inputs[0]->h;
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    } else {
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        /* XXX: any non-simple filter which would cause this branch to be taken
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         * really should implement its own config_props() for this link. */
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        link->w =
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        link->h = 0;
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    }
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    return 0;
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}
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/**
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 * default query_formats() implementation for output video links to simplify
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 * the implementation of one input one output video filters */
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int *avfilter_default_query_output_formats(AVFilterLink *link)
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{
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    if(link->src->input_count && link->src->inputs[0])
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        return avfilter_make_format_list(1, link->src->inputs[0]->format);
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    else
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        /* XXX: any non-simple filter which would cause this branch to be taken
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         * really should implement its own query_formats() for this link */
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        return avfilter_make_format_list(0);
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}
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