/* * Filter layer - default implementations * 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 "libavcodec/imgconvert.h"#include "avfilter.h"/* TODO: buffer pool.  see comment for avfilter_default_get_video_buffer() */void avfilter_default_free_video_buffer(AVFilterPic *pic){    av_free(pic->data[0]);    av_free(pic);}#define ALIGN(a) do{ \                     (a) = ((a) + 15) & (~15); \                 } while(0);/* 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));    int i, tempsize;    char *buf;    ref->pic   = pic;    ref->w     = link->w;    ref->h     = link->h;    /* make sure the buffer gets read permission or it's useless for output */    ref->perms = perms | AV_PERM_READ;    pic->refcount = 1;    pic->format   = link->format;    pic->free     = avfilter_default_free_video_buffer;    ff_fill_linesize((AVPicture *)pic, pic->format, ref->w);    for (i=0; i<4;i++)        ALIGN(pic->linesize[i]);    tempsize = ff_fill_pointer((AVPicture *)pic, NULL, pic->format, ref->h);    buf = av_malloc(tempsize);    ff_fill_pointer((AVPicture *)pic, buf, pic->format, ref->h);    memcpy(ref->data,     pic->data,     sizeof(pic->data));    memcpy(ref->linesize, pic->linesize, sizeof(pic->linesize));    return ref;}void avfilter_default_start_frame(AVFilterLink *link, AVFilterPicRef *picref){    AVFilterLink *out = NULL;    if(link->dst->output_count)        out = link->dst->outputs[0];    if(out) {        out->outpic      = avfilter_get_video_buffer(out, AV_PERM_WRITE);        out->outpic->pts = picref->pts;        avfilter_start_frame(out, avfilter_ref_pic(out->outpic, ~0));    }}void avfilter_default_end_frame(AVFilterLink *link){    AVFilterLink *out = NULL;    if(link->dst->output_count)        out = link->dst->outputs[0];    avfilter_unref_pic(link->cur_pic);    link->cur_pic = NULL;    if(out) {        if(out->outpic) {            avfilter_unref_pic(out->outpic);            out->outpic = NULL;        }        avfilter_end_frame(out);    }}/** * default config_link() implementation for output video links to simplify * the implementation of one input one output video filters */int avfilter_default_config_output_link(AVFilterLink *link){    if(link->src->input_count && link->src->inputs[0]) {        link->w = link->src->inputs[0]->w;        link->h = link->src->inputs[0]->h;    } else {        /* XXX: any non-simple filter which would cause this branch to be taken         * really should implement its own config_props() for this link. */        return -1;    }    return 0;}/** * A helper for query_formats() which sets all links to the same list of * formats. If there are no links hooked to this filter, the list of formats is * freed. * * FIXME: this will need changed for filters with a mix of pad types * (video + audio, etc) */void avfilter_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats){    int count = 0, i;    for(i = 0; i < ctx->input_count; i ++) {        if(ctx->inputs[i]) {            avfilter_formats_ref(formats, &ctx->inputs[i]->out_formats);            count ++;        }    }    for(i = 0; i < ctx->output_count; i ++) {        if(ctx->outputs[i]) {            avfilter_formats_ref(formats, &ctx->outputs[i]->in_formats);            count ++;        }    }    if(!count) {        av_free(formats->formats);        av_free(formats->refs);        av_free(formats);    }}int avfilter_default_query_formats(AVFilterContext *ctx){    avfilter_set_common_formats(ctx, avfilter_all_colorspaces());    return 0;}