/* * Filter layer * 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 <stdarg.h>#include <stdlib.h>#include <string.h>#include <stdio.h> #include "avfilter.h"#include "allfilters.h" /** list of registered filters */struct FilterList{    AVFilter *filter;    struct FilterList *next;} *filters = NULL; /** helper macros to get the in/out pad on the dst/src filter */#define link_dpad(link)     link->dst-> input_pads[link->dstpad]#define link_spad(link)     link->src->output_pads[link->srcpad] AVFilterPicRef *avfilter_ref_pic(AVFilterPicRef *ref, int pmask){    AVFilterPicRef *ret = av_malloc(sizeof(AVFilterPicRef));    *ret = *ref;    ret->perms &= pmask;    ret->pic->refcount ++;    return ret;} void avfilter_unref_pic(AVFilterPicRef *ref){    if(-- ref->pic->refcount == 0)        ref->pic->free(ref->pic);    av_free(ref);} void avfilter_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,                         AVFilterPad **pads, AVFilterLink ***links,                         AVFilterPad *newpad){    unsigned i;     idx = FFMIN(idx, *count);     *pads  = av_realloc(*pads,  sizeof(AVFilterPad)   * (*count + 1));    *links = av_realloc(*links, sizeof(AVFilterLink*) * (*count + 1));    memmove(*pads +idx+1, *pads +idx, sizeof(AVFilterPad)   * (*count-idx));    memmove(*links+idx+1, *links+idx, sizeof(AVFilterLink*) * (*count-idx));    memcpy(*pads+idx, newpad, sizeof(AVFilterPad));    (*links)[idx] = NULL;     (*count) ++;    for(i = idx+1; i < *count; i ++)        if(*links[i])            (*(unsigned *)((uint8_t *)(*links[i]) + padidx_off)) ++;} int avfilter_link(AVFilterContext *src, unsigned srcpad,                  AVFilterContext *dst, unsigned dstpad){    AVFilterLink *link;     if(src->output_count <= srcpad || dst->input_count <= dstpad ||       src->outputs[srcpad]        || dst->inputs[dstpad])        return -1;     src->outputs[srcpad] =    dst->inputs[dstpad]  = link = av_mallocz(sizeof(AVFilterLink));     link->src     = src;    link->dst     = dst;    link->srcpad  = srcpad;    link->dstpad  = dstpad;    link->format  = -1;     return 0;} static int common_format(int *fmts0, int *fmts1){    int i, j;     for(i = 0; fmts0[i] != -1; i ++)        for(j = 0; fmts1[j] != -1; j ++)            if(fmts0[i] == fmts1[j])                return fmts0[i];     return -1;} int avfilter_config_link(AVFilterLink *link){    int *fmts[3] = {NULL,NULL,NULL};    int (*config_link)(AVFilterLink *);    int *(*query_formats)(AVFilterLink *link);     AVFilterContext *scale;    AVFilterLink *link2 = NULL;     if(!link)        return 0;     /* find a format both filters support */    if(!(query_formats = link_spad(link).query_formats))        query_formats = avfilter_default_query_output_formats;    fmts[0] = query_formats(link);    fmts[1] = link_dpad(link).query_formats(link);    if((link->format = common_format(fmts[0], fmts[1])) == -1) {        /* no common format found.  insert scale filter to convert */        if(!(scale = avfilter_open(&avfilter_vf_scale, NULL)))            goto format_done;        if(scale->filter->init(scale, NULL, NULL)) {            avfilter_destroy(scale);            goto format_done;        }         link->dst->inputs[link->dstpad] = NULL;        if(avfilter_link(scale, 0, link->dst, link->dstpad)) {            link->dst->inputs[link->dstpad] = link;            goto format_done;        }        link2 = scale->outputs[0];        link->dst    = scale;        link->dstpad = 0;        scale->inputs[0] = link;         /* now try again to find working colorspaces.         * XXX: is it safe to assume that the scale filter always supports the         * same input and output colorspaces? */        fmts[2] = scale->input_pads[0].query_formats(link);        link->format  = common_format(fmts[0], fmts[2]);        link2->format = common_format(fmts[1], fmts[2]);    } format_done:    av_free(fmts[0]);    av_free(fmts[1]);    av_free(fmts[2]);    if(link->format == -1 || (link2 && link2->format == -1)) {        if(link2) {            link->dst    = link2->dst;            link->dstpad = link2->dstpad;            link->dst->inputs[link->dstpad] = link;            link->format = -1;            avfilter_destroy(scale);            av_free(link2);        }        return -1;    }     if(!(config_link = link_spad(link).config_props))        config_link  = avfilter_default_config_output_link;    if(config_link(link))            return -1;     if(!(config_link = link_dpad(link).config_props))        config_link  = avfilter_default_config_input_link;    if(config_link(link))            return -1;     if(link2) {        if(!(config_link = link_spad(link2).config_props))            config_link  = avfilter_default_config_output_link;        if(config_link(link2))                return -1;         if(!(config_link = link_dpad(link2).config_props))            config_link  = avfilter_default_config_input_link;        if(config_link(link2))                return -1;    }     return 0;} AVFilterPicRef *avfilter_get_video_buffer(AVFilterLink *link, int perms){    AVFilterPicRef *ret = NULL;     if(link_dpad(link).get_video_buffer)        ret = link_dpad(link).get_video_buffer(link, perms);     if(!ret)        ret = avfilter_default_get_video_buffer(link, perms);     return ret;} int avfilter_request_frame(AVFilterLink *link){    if(link_spad(link).request_frame)        return link_spad(link).request_frame(link);    else if(link->src->inputs[0])        return avfilter_request_frame(link->src->inputs[0]);    else return -1;} /* XXX: should we do the duplicating of the picture ref here, instead of * forcing the source filter to do it? */void avfilter_start_frame(AVFilterLink *link, AVFilterPicRef *picref){    void (*start_frame)(AVFilterLink *, AVFilterPicRef *);     if(!(start_frame = link_dpad(link).start_frame))        start_frame = avfilter_default_start_frame;     /* prepare to copy the picture if it has insufficient permissions */    if((link_dpad(link).min_perms & picref->perms) != link_dpad(link).min_perms ||        link_dpad(link).rej_perms & picref->perms) {        av_log(link->dst, AV_LOG_INFO,                "frame copy needed (have perms %x, need %x, reject %x)\n",                picref->perms,                link_dpad(link).min_perms, link_dpad(link).rej_perms);         link->cur_pic = avfilter_default_get_video_buffer(link, link_dpad(link).min_perms);        link->srcpic = picref;    }    else        link->cur_pic = picref;     start_frame(link, link->cur_pic);} void avfilter_end_frame(AVFilterLink *link){    void (*end_frame)(AVFilterLink *);     /* unreference the source picture if we're feeding the destination filter     * a copied version dues to permission issues */    if(link->srcpic) {        avfilter_unref_pic(link->srcpic);        link->srcpic = NULL;    }     if(!(end_frame = link_dpad(link).end_frame))        end_frame = avfilter_default_end_frame;     end_frame(link);} void avfilter_draw_slice(AVFilterLink *link, int y, int h){    uint8_t *src[4], *dst[4];    int i, j, hsub, vsub;     /* copy the slice if needed for permission reasons */    if(link->srcpic) {        avcodec_get_chroma_sub_sample(link->format, &hsub, &vsub);         src[0] = link->srcpic-> data[0] + y * link->srcpic-> linesize[0];        dst[0] = link->cur_pic->data[0] + y * link->cur_pic->linesize[0];        for(i = 1; i < 4; i ++) {            if(link->srcpic->data[i]) {                src[i] = link->srcpic-> data[i] + (y >> vsub) * link->srcpic-> linesize[i];                dst[i] = link->cur_pic->data[i] + (y >> vsub) * link->cur_pic->linesize[i];            } else                src[i] = dst[i] = NULL;        }        for(j = 0; j < h; j ++) {            memcpy(dst[0], src[0], link->cur_pic->linesize[0]);            src[0] += link->srcpic ->linesize[0];            dst[0] += link->cur_pic->linesize[0];        }        for(i = 1; i < 4; i ++) {            if(!src[i]) continue;             for(j = 0; j < h >> vsub; j ++) {                memcpy(dst[i], src[i], link->cur_pic->linesize[i]);                src[i] += link->srcpic ->linesize[i];                dst[i] += link->cur_pic->linesize[i];            }        }    }     if(!link_dpad(link).draw_slice)        return;     link_dpad(link).draw_slice(link, y, h);} AVFilter *avfilter_get_by_name(char *name){    struct FilterList *filt;     for(filt = filters; filt; filt = filt->next)        if(!strcmp(filt->filter->name, name))            return filt->filter;     return NULL;} /* FIXME: insert in order, rather than insert at end + resort */void avfilter_register(AVFilter *filter){    struct FilterList *newfilt = av_malloc(sizeof(struct FilterList));     newfilt->filter = filter;    newfilt->next   = filters;    filters         = newfilt;} void avfilter_init(void){    avfilter_register(&avfilter_vsrc_dummy);    avfilter_register(&avfilter_vsrc_ppm);    avfilter_register(&avfilter_vf_crop);    avfilter_register(&avfilter_vf_fifo);    avfilter_register(&avfilter_vf_fps);    avfilter_register(&avfilter_vf_graph);    avfilter_register(&avfilter_vf_graphdesc);    avfilter_register(&avfilter_vf_graphfile);    avfilter_register(&avfilter_vf_negate);    avfilter_register(&avfilter_vf_overlay);    avfilter_register(&avfilter_vf_passthrough);    avfilter_register(&avfilter_vf_rgb2bgr);    avfilter_register(&avfilter_vf_scale);    avfilter_register(&avfilter_vf_slicify);    avfilter_register(&avfilter_vf_split);    avfilter_register(&avfilter_vf_vflip);} void avfilter_uninit(void){    struct FilterList *tmp;     for(; filters; filters = tmp) {        tmp = filters->next;        av_free(filters);    }} static int pad_count(const AVFilterPad *pads){    AVFilterPad *p = (AVFilterPad *) pads;    int count;     for(count = 0; p->name; count ++) p ++;    return count;} static const char *filter_name(void *p){    AVFilterContext *filter = p;    return filter->filter->name;} AVFilterContext *avfilter_open(AVFilter *filter, char *inst_name){    AVFilterContext *ret = av_malloc(sizeof(AVFilterContext));     ret->av_class = av_mallocz(sizeof(AVClass));    ret->av_class->item_name = filter_name;    ret->filter   = filter;    ret->name     = inst_name ? av_strdup(inst_name) : NULL;    ret->priv     = av_mallocz(filter->priv_size);     ret->input_count  = pad_count(filter->inputs);    ret->input_pads   = av_malloc(sizeof(AVFilterPad) * ret->input_count);    memcpy(ret->input_pads, filter->inputs, sizeof(AVFilterPad)*ret->input_count);    ret->inputs       = av_mallocz(sizeof(AVFilterLink*) * ret->input_count);     ret->output_count = pad_count(filter->outputs);    ret->output_pads  = av_malloc(sizeof(AVFilterPad) * ret->output_count);    memcpy(ret->output_pads, filter->outputs, sizeof(AVFilterPad)*ret->output_count);    ret->outputs      = av_mallocz(sizeof(AVFilterLink*) * ret->output_count);     return ret;} void avfilter_destroy(AVFilterContext *filter){    int i;     if(filter->filter->uninit)        filter->filter->uninit(filter);     for(i = 0; i < filter->input_count; i ++) {        if(filter->inputs[i])            filter->inputs[i]->src->outputs[filter->inputs[i]->srcpad] = NULL;        av_freep(&filter->inputs[i]);    }    for(i = 0; i < filter->output_count; i ++) {        if(filter->outputs[i])            filter->outputs[i]->dst->inputs[filter->outputs[i]->dstpad] = NULL;        av_freep(&filter->outputs[i]);    }     av_freep(&filter->name);    av_freep(&filter->input_pads);    av_freep(&filter->output_pads);    av_freep(&filter->inputs);    av_freep(&filter->outputs);    av_freep(&filter->priv);    av_freep(&filter->av_class);    av_free(filter);} int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque){    int ret;     if(filter->filter->init)        if((ret = filter->filter->init(filter, args, opaque))) return ret;    return 0;} int *avfilter_make_format_list(int len, ...){    int *ret, i;    va_list vl;     ret = av_malloc(sizeof(int) * (len + 1));    va_start(vl, len);    for(i = 0; i < len; i ++)        ret[i] = va_arg(vl, int);    va_end(vl);    ret[len] = -1;     return ret;}