/* * 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, sorted by name */static int filter_count = 0;static AVFilter **filters = NULL; /* 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);    }} AVFilterPicRef *avfilter_ref_pic(AVFilterPicRef *ref, int pmask){    AVFilterPicRef *ret = av_malloc(sizeof(AVFilterPicRef));    memcpy(ret, ref, sizeof(AVFilterPicRef));    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);} /** * default config_link() implementation for output video links to simplify * the implementation of one input one output video filters */static int 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 */static int *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);} int avfilter_link(AVFilterContext *src, unsigned srcpad,                  AVFilterContext *dst, unsigned dstpad){    AVFilterLink *link;    int *fmts[2], i, j;     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_malloc(sizeof(AVFilterLink));     link->src     = src;    link->dst     = dst;    link->srcpad  = srcpad;    link->dstpad  = dstpad;    link->cur_pic = NULL;     /* find a format both filters support - TODO: auto-insert conversion filter */    link->format = -1;    if(src->output_pads[srcpad].query_formats)        fmts[0] = src->output_pads[srcpad].query_formats(link);    else        fmts[0] = default_query_output_formats(link);    fmts[1] = dst->input_pads[dstpad].query_formats(link);    for(i = 0; fmts[0][i] != -1; i ++)        for(j = 0; fmts[1][j] != -1; j ++)            if(fmts[0][i] == fmts[1][j]) {                link->format = fmts[0][i];                goto format_done;            } format_done:    av_free(fmts[0]);    av_free(fmts[1]);    if(link->format == -1) {        /* failed to find a format.  fail at creating the link */        av_free(link);        src->outputs[srcpad] = NULL;        dst->inputs[dstpad]  = NULL;        return -1;    }     if (src->output_pads[srcpad].config_props)        src->output_pads[srcpad].config_props(link);    else        default_config_output_link(link);     if (dst->input_pads[dstpad].config_props)        dst->input_pads[dstpad].config_props(link);     return 0;} AVFilterPicRef *avfilter_get_video_buffer(AVFilterLink *link, int perms){    AVFilterPicRef *ret = NULL;     if(link->dst->input_pads[link->dstpad].get_video_buffer)        ret = link->dst->input_pads[link->dstpad].get_video_buffer(link, perms);     if(!ret)        ret = avfilter_default_get_video_buffer(link, perms);     return ret;} void avfilter_request_frame(AVFilterLink *link){    const AVFilterPad *pad = &link->src->output_pads[link->srcpad];     if(pad->request_frame)        pad->request_frame(link);    else if(link->src->inputs[0])        avfilter_request_frame(link->src->inputs[0]);} /* 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 *);     start_frame = link->dst->input_pads[link->dstpad].start_frame;    if(!start_frame)        start_frame = avfilter_default_start_frame;     start_frame(link, picref);} void avfilter_end_frame(AVFilterLink *link){    void (*end_frame)(AVFilterLink *);     end_frame = link->dst->input_pads[link->dstpad].end_frame;    if(!end_frame)        end_frame = avfilter_default_end_frame;     end_frame(link);} void avfilter_draw_slice(AVFilterLink *link, uint8_t *data[4], int y, int h){    if(!link->dst->input_pads[link->dstpad].draw_slice)        return;     link->dst->input_pads[link->dstpad].draw_slice(link, data, y, h);} static int filter_cmp(const void *aa, const void *bb){    const AVFilter *a = *(const AVFilter **)aa, *b = *(const AVFilter **)bb;    return strcmp(a->name, b->name);} AVFilter *avfilter_get_by_name(char *name){    AVFilter key = { .name = name, };    AVFilter *key2 = &key;    AVFilter **ret;     ret = bsearch(&key2, filters, filter_count, sizeof(AVFilter **), filter_cmp);    if(ret)        return *ret;    return NULL;} /* FIXME: insert in order, rather than insert at end + resort */void avfilter_register(AVFilter *filter){    filters = av_realloc(filters, sizeof(AVFilter*) * (filter_count+1));    filters[filter_count] = filter;    qsort(filters, ++filter_count, sizeof(AVFilter **), filter_cmp);} void avfilter_init(void){    avfilter_register(&vsrc_dummy);    avfilter_register(&vsrc_ppm);    avfilter_register(&vf_crop);    avfilter_register(&vf_graph);    avfilter_register(&vf_passthrough);    avfilter_register(&vf_rgb2bgr);    avfilter_register(&vf_slicify);    avfilter_register(&vo_sdl);} void avfilter_uninit(void){    av_freep(&filters);    filter_count = 0;} 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_create(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_free(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_free(filter->outputs[i]);    }     av_free(filter->name);    av_free(filter->input_pads);    av_free(filter->output_pads);    av_free(filter->inputs);    av_free(filter->outputs);    av_free(filter->priv);    av_free(filter->av_class);    av_free(filter);} AVFilterContext *avfilter_create_by_name(char *name, char *inst_name){    AVFilter *filt;     if(!(filt = avfilter_get_by_name(name))) return NULL;    return avfilter_create(filt, inst_name);} 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;}