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ffmpeg / libavfilter / avfilter.c @ 97fb0c2c

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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, sorted by name */
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static int filter_count = 0;
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static AVFilter **filters = NULL;
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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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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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    memcpy(ret, ref, sizeof(AVFilterPicRef));
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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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/**
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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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static int 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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static int *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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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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    int *fmts[2], i, j;
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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_malloc(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->cur_pic = NULL;
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    /* find a format both filters support - TODO: auto-insert conversion filter */
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    link->format = -1;
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    if(src->filter->outputs[srcpad].query_formats)
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        fmts[0] = src->filter->outputs[srcpad].query_formats(link);
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    else
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        fmts[0] = default_query_output_formats(link);
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    fmts[1] = dst->filter-> inputs[dstpad].query_formats(link);
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    for(i = 0; fmts[0][i] != -1; i ++)
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        for(j = 0; fmts[1][j] != -1; j ++)
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            if(fmts[0][i] == fmts[1][j]) {
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                link->format = fmts[0][i];
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                goto format_done;
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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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    if(link->format == -1) {
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        /* failed to find a format.  fail at creating the link */
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        av_free(link);
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        src->outputs[srcpad] = NULL;
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        dst->inputs[dstpad]  = NULL;
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        return -1;
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    }
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    if (src->filter->outputs[srcpad].config_props)
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        src->filter->outputs[srcpad].config_props(link);
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    else
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        default_config_output_link(link);
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    if (dst->filter->inputs[dstpad].config_props)
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        dst->filter->inputs[dstpad].config_props(link);
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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->dst->filter->inputs[link->dstpad].get_video_buffer)
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        ret = link->dst->filter->inputs[link->dstpad].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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void avfilter_request_frame(AVFilterLink *link)
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{
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    const AVFilterPad *pad = &link->src->filter->outputs[link->srcpad];
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    if(pad->request_frame)
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        pad->request_frame(link);
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    else if(link->src->inputs[0])
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        avfilter_request_frame(link->src->inputs[0]);
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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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    start_frame = link->dst->filter->inputs[link->dstpad].start_frame;
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    if(!start_frame)
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        start_frame = avfilter_default_start_frame;
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    start_frame(link, picref);
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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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    end_frame = link->dst->filter->inputs[link->dstpad].end_frame;
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    if(!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, uint8_t *data[4], int y, int h)
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{
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    if(!link->dst->filter->inputs[link->dstpad].draw_slice)
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        return;
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    link->dst->filter->inputs[link->dstpad].draw_slice(link, data, y, h);
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}
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static int filter_cmp(const void *aa, const void *bb)
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{
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    const AVFilter *a = *(const AVFilter **)aa, *b = *(const AVFilter **)bb;
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    return strcmp(a->name, b->name);
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}
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AVFilter *avfilter_get_by_name(char *name)
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{
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    AVFilter key = { .name = name, };
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    AVFilter *key2 = &key;
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    AVFilter **ret;
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    ret = bsearch(&key2, filters, filter_count, sizeof(AVFilter **), filter_cmp);
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    if(ret)
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        return *ret;
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    return NULL;
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}
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/* FIXME: insert in order, rather than insert at end + resort */
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void avfilter_register(AVFilter *filter)
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{
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    filters = av_realloc(filters, sizeof(AVFilter*) * (filter_count+1));
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    filters[filter_count] = filter;
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    qsort(filters, ++filter_count, sizeof(AVFilter **), filter_cmp);
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}
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void avfilter_init(void)
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{
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    avfilter_register(&vsrc_dummy);
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    avfilter_register(&vsrc_ppm);
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    avfilter_register(&vf_crop);
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    avfilter_register(&vf_passthrough);
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    avfilter_register(&vf_rgb2bgr);
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    avfilter_register(&vf_slicify);
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    avfilter_register(&vo_sdl);
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}
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void avfilter_uninit(void)
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{
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    av_freep(&filters);
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    filter_count = 0;
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}
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static int pad_count(const AVFilterPad *pads)
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{
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    AVFilterPad *p = (AVFilterPad *) pads;
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    int count;
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    for(count = 0; p->name; count ++) p ++;
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    return count;
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}
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static const char *filter_name(void *p)
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{
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    AVFilterContext *filter = p;
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    return filter->filter->name;
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}
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AVFilterContext *avfilter_create(AVFilter *filter, char *inst_name)
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{
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    AVFilterContext *ret = av_malloc(sizeof(AVFilterContext));
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    ret->av_class = av_mallocz(sizeof(AVClass));
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    ret->av_class->item_name = filter_name;
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    ret->filter   = filter;
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    ret->name     = inst_name ? av_strdup(inst_name) : NULL;
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    ret->priv     = av_mallocz(filter->priv_size);
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    ret->input_count  = pad_count(filter->inputs);
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    ret->inputs       = av_mallocz(sizeof(AVFilterLink*) * ret->input_count);
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    ret->output_count = pad_count(filter->outputs);
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    ret->outputs      = av_mallocz(sizeof(AVFilterLink*) * ret->output_count);
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    return ret;
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}
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void avfilter_destroy(AVFilterContext *filter)
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{
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    int i;
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    if(filter->filter->uninit)
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        filter->filter->uninit(filter);
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    for(i = 0; i < pad_count(filter->filter->inputs); i ++) {
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        if(filter->inputs[i])
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            filter->inputs[i]->src->outputs[filter->inputs[i]->srcpad] = NULL;
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        av_free(filter->inputs[i]);
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    }
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    for(i = 0; i < pad_count(filter->filter->outputs); i ++) {
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        if(filter->outputs[i])
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            filter->outputs[i]->dst->inputs[filter->outputs[i]->dstpad] = NULL;
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        av_free(filter->outputs[i]);
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    }
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    av_free(filter->name);
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    av_free(filter->inputs);
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    av_free(filter->outputs);
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    av_free(filter->priv);
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    av_free(filter->av_class);
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    av_free(filter);
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}
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AVFilterContext *avfilter_create_by_name(char *name, char *inst_name)
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{
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    AVFilter *filt;
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    if(!(filt = avfilter_get_by_name(name))) return NULL;
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    return avfilter_create(filt, inst_name);
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}
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int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque)
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{
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    int ret, i;
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    if(filter->filter->init)
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        if((ret = filter->filter->init(filter, args, opaque))) return ret;
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    return 0;
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}
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int *avfilter_make_format_list(int len, ...)
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{
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    int *ret, i;
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    va_list vl;
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    ret = av_malloc(sizeof(int) * (len + 1));
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    va_start(vl, len);
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    for(i = 0; i < len; i ++)
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        ret[i] = va_arg(vl, int);
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    va_end(vl);
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    ret[len] = -1;
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    return ret;
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}
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