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ffmpeg / libavfilter / avfilter.c @ a4af86c8

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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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/** 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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/**
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 * helper function to get a pointer to the structure telling the permissions
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 * the filter has on the given picture, or to create the structure if it
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 * does not yet exist.
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 */
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static AVFilterPicPerms *get_perms(AVFilterPic *pic, AVFilterContext *filter)
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{
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    AVFilterPicPerms *ret;
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    for(ret = pic->perms; ret; ret = ret->next)
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        if(ret->filter == filter)
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            return ret;
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    ret = av_malloc(sizeof(AVFilterPicPerms));
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    ret->filter = filter;
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    ret->perms  = 0;
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    ret->next   = pic->perms;
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    pic->perms  = ret;
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    return ret;
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}
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int avfilter_get_pic_perms(AVFilterPicRef *pic, AVFilterContext *filter)
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{
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    return get_perms(pic->pic, filter)->perms;
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}
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void avfilter_add_pic_perms(AVFilterPicRef *pic, AVFilterContext *filter,
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                            int perms)
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{
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    get_perms(pic->pic, filter)->perms |= perms;
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}
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AVFilterPicRef *avfilter_ref_pic(AVFilterPicRef *ref, AVFilterContext *filter,
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                                 int pmask)
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{
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    AVFilterPicPerms *pic_perms;
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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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    if(filter) {
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        pic_perms = get_perms(ref->pic, filter);
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        pic_perms->perms |= ret->perms;
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    }
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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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    AVFilterPicPerms *perms;
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    if(-- ref->pic->refcount == 0) {
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        for(; ref->pic->perms; ref->pic->perms = perms) {
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            perms = ref->pic->perms->next;
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            av_free(ref->pic->perms);
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        }
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        ref->pic->free(ref->pic);
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    }
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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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int avfilter_config_link(AVFilterLink *link)
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{
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    int *fmts[2], i, j;
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    int (*config_link)(AVFilterLink *);
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    if(!link)
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        return 0;
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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(link_spad(link).query_formats)
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        fmts[0] = link_spad(link).query_formats(link);
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    else
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        fmts[0] = avfilter_default_query_output_formats(link);
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    fmts[1] = link_dpad(link).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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        return -1;
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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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    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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    int perms = get_perms(picref->pic, link->dst)->perms;
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    void (*start_frame)(AVFilterLink *, AVFilterPicRef *);
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    start_frame = link_dpad(link).start_frame;
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    if(!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 & perms) != link_dpad(link).min_perms ||
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        link_dpad(link).rej_perms & 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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                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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    end_frame = link_dpad(link).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, 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)
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        return;
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    link_dpad(link).draw_slice(link, 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_fps);
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    avfilter_register(&vf_graph);
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    avfilter_register(&vf_graphdesc);
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    avfilter_register(&vf_graphfile);
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    avfilter_register(&vf_overlay);
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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(&vf_vflip);
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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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{
358
    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->input_pads   = av_malloc(sizeof(AVFilterPad) * ret->input_count);
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    memcpy(ret->input_pads, filter->inputs, sizeof(AVFilterPad)*ret->input_count);
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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->output_pads  = av_malloc(sizeof(AVFilterPad) * ret->output_count);
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    memcpy(ret->output_pads, filter->outputs, sizeof(AVFilterPad)*ret->output_count);
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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)
380
{
381
    int i;
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    if(filter->filter->uninit)
384
        filter->filter->uninit(filter);
385

    
386
    for(i = 0; i < filter->input_count; i ++) {
387
        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]);
390
    }
391
    for(i = 0; i < filter->output_count; i ++) {
392
        if(filter->outputs[i])
393
            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->input_pads);
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    av_free(filter->output_pads);
400
    av_free(filter->inputs);
401
    av_free(filter->outputs);
402
    av_free(filter->priv);
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    av_free(filter->av_class);
404
    av_free(filter);
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}
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AVFilterContext *avfilter_create_by_name(char *name, char *inst_name)
408
{
409
    AVFilter *filt;
410

    
411
    if(!(filt = avfilter_get_by_name(name))) return NULL;
412
    return avfilter_create(filt, inst_name);
413
}
414

    
415
int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque)
416
{
417
    int ret;
418

    
419
    if(filter->filter->init)
420
        if((ret = filter->filter->init(filter, args, opaque))) return ret;
421
    return 0;
422
}
423

    
424
int *avfilter_make_format_list(int len, ...)
425
{
426
    int *ret, i;
427
    va_list vl;
428

    
429
    ret = av_malloc(sizeof(int) * (len + 1));
430
    va_start(vl, len);
431
    for(i = 0; i < len; i ++)
432
        ret[i] = va_arg(vl, int);
433
    va_end(vl);
434
    ret[len] = -1;
435

    
436
    return ret;
437
}
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