PeerStreamer

/*

 * 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 "avfilter.h"

/* 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);

    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];

    link->cur_pic = picref;

    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) {

        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. */

        link->w =

        link->h = 0;

    }

    return 0;

}

/**

 * default query_formats() implementation for output video links to simplify

 * the implementation of one input one output video filters */

int *avfilter_default_query_output_formats(AVFilterLink *link)

{

    if(link->src->input_count && link->src->inputs[0])

        return avfilter_make_format_list(1, link->src->inputs[0]->format);

    else

        /* XXX: any non-simple filter which would cause this branch to be taken

         * really should implement its own query_formats() for this link */

        return avfilter_make_format_list(0);

}