/* * 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 */ /* #define DEBUG */ #include "libavcodec/imgconvert.h"#include "libavutil/pixdesc.h"#include "avfilter.h" unsigned avfilter_version(void) {    return LIBAVFILTER_VERSION_INT;} const char *avfilter_configuration(void){    return FFMPEG_CONFIGURATION;} const char *avfilter_license(void){#define LICENSE_PREFIX "libavfilter license: "    return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;} /** 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))        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  = PIX_FMT_NONE;     return 0;} int avfilter_insert_filter(AVFilterLink *link, AVFilterContext *filt,                           unsigned in, unsigned out){    av_log(link->dst, AV_LOG_INFO, "auto-inserting filter '%s' "           "between the filter '%s' and the filter '%s'\n",           filt->name, link->src->name, link->dst->name);     link->dst->inputs[link->dstpad] = NULL;    if(avfilter_link(filt, out, link->dst, link->dstpad)) {        /* failed to link output filter to new filter */        link->dst->inputs[link->dstpad] = link;        return -1;    }     /* re-hookup the link to the new destination filter we inserted */    link->dst = filt;    link->dstpad = in;    filt->inputs[in] = link;     /* if any information on supported colorspaces already exists on the     * link, we need to preserve that */    if(link->out_formats)        avfilter_formats_changeref(&link->out_formats,                                   &filt->outputs[out]->out_formats);     return 0;} int avfilter_config_links(AVFilterContext *filter){    int (*config_link)(AVFilterLink *);    unsigned i;     for(i = 0; i < filter->input_count; i ++) {        AVFilterLink *link = filter->inputs[i];         if(!link) continue;         switch(link->init_state) {        case AVLINK_INIT:            continue;        case AVLINK_STARTINIT:            av_log(filter, AV_LOG_INFO, "circular filter chain detected\n");            return 0;        case AVLINK_UNINIT:            link->init_state = AVLINK_STARTINIT;             if(avfilter_config_links(link->src))                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))                if(config_link(link))                    return -1;             link->init_state = AVLINK_INIT;        }    }     return 0;} static void dprintf_picref(void *ctx, AVFilterPicRef *picref, int end){    dprintf(ctx,            "picref[%p data[%p, %p, %p, %p] linesize[%d, %d, %d, %d] pts:%"PRId64" pos:%"PRId64" a:%d/%d s:%dx%d]%s",            picref,            picref->data    [0], picref->data    [1], picref->data    [2], picref->data    [3],            picref->linesize[0], picref->linesize[1], picref->linesize[2], picref->linesize[3],            picref->pts, picref->pos,            picref->pixel_aspect.num, picref->pixel_aspect.den, picref->w, picref->h,            end ? "\n" : "");} static void dprintf_link(void *ctx, AVFilterLink *link, int end){    dprintf(ctx,            "link[%p s:%dx%d fmt:%-16s %-16s->%-16s]%s",            link, link->w, link->h,            av_pix_fmt_descriptors[link->format].name,            link->src ? link->src->filter->name : "",            link->dst ? link->dst->filter->name : "",            end ? "\n" : "");} #define DPRINTF_START(ctx, func) dprintf(NULL, "%-16s: ", #func) AVFilterPicRef *avfilter_get_video_buffer(AVFilterLink *link, int perms, int w, int h){    AVFilterPicRef *ret = NULL;     DPRINTF_START(NULL, get_video_buffer); dprintf_link(NULL, link, 0); dprintf(NULL, " perms:%d w:%d h:%d\n", perms, w, h);     if(link_dpad(link).get_video_buffer)        ret = link_dpad(link).get_video_buffer(link, perms, w, h);     if(!ret)        ret = avfilter_default_get_video_buffer(link, perms, w, h);     DPRINTF_START(NULL, get_video_buffer); dprintf_link(NULL, link, 0); dprintf(NULL, " returning "); dprintf_picref(NULL, ret, 1);     return ret;} int avfilter_request_frame(AVFilterLink *link){    DPRINTF_START(NULL, request_frame); dprintf_link(NULL, link, 1);     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;} int avfilter_poll_frame(AVFilterLink *link){    int i, min=INT_MAX;     if(link_spad(link).poll_frame)        return link_spad(link).poll_frame(link);     for (i=0; i<link->src->input_count; i++) {        int val;        if(!link->src->inputs[i])            return -1;        val = avfilter_poll_frame(link->src->inputs[i]);        min = FFMIN(min, val);    }     return min;} /* 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 *);    AVFilterPad *dst = &link_dpad(link);     DPRINTF_START(NULL, start_frame); dprintf_link(NULL, link, 0); dprintf(NULL, " "); dprintf_picref(NULL, picref, 1);     if(!(start_frame = dst->start_frame))        start_frame = avfilter_default_start_frame;     /* prepare to copy the picture if it has insufficient permissions */    if((dst->min_perms & picref->perms) != dst->min_perms ||        dst->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, dst->min_perms, link->w, link->h);        link->srcpic = picref;        link->cur_pic->pts = link->srcpic->pts;        link->cur_pic->pos = link->srcpic->pos;        link->cur_pic->pixel_aspect = link->srcpic->pixel_aspect;        link->cur_pic->interlaced      = link->srcpic->interlaced;        link->cur_pic->top_field_first = link->srcpic->top_field_first;    }    else        link->cur_pic = picref;     start_frame(link, link->cur_pic);} void avfilter_end_frame(AVFilterLink *link){    void (*end_frame)(AVFilterLink *);     if(!(end_frame = link_dpad(link).end_frame))        end_frame = avfilter_default_end_frame;     end_frame(link);     /* 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;    } } void avfilter_draw_slice(AVFilterLink *link, int y, int h, int slice_dir){    uint8_t *src[4], *dst[4];    int i, j, vsub;    void (*draw_slice)(AVFilterLink *, int, int, int);     DPRINTF_START(NULL, draw_slice); dprintf_link(NULL, link, 0); dprintf(NULL, " y:%d h:%d dir:%d\n", y, h, slice_dir);     /* copy the slice if needed for permission reasons */    if(link->srcpic) {        vsub = av_pix_fmt_descriptors[link->format].log2_chroma_h;         for(i = 0; i < 4; i ++) {            if(link->srcpic->data[i]) {                src[i] = link->srcpic-> data[i] +                    (y >> (i==0 ? 0 : vsub)) * link->srcpic-> linesize[i];                dst[i] = link->cur_pic->data[i] +                    (y >> (i==0 ? 0 : vsub)) * link->cur_pic->linesize[i];            } else                src[i] = dst[i] = NULL;        }         for(i = 0; i < 4; i ++) {            int planew =                ff_get_plane_bytewidth(link->format, link->cur_pic->w, i);             if(!src[i]) continue;             for(j = 0; j < h >> (i==0 ? 0 : vsub); j ++) {                memcpy(dst[i], src[i], planew);                src[i] += link->srcpic ->linesize[i];                dst[i] += link->cur_pic->linesize[i];            }        }    }     if(!(draw_slice = link_dpad(link).draw_slice))        draw_slice = avfilter_default_draw_slice;    draw_slice(link, y, h, slice_dir);} #define MAX_REGISTERED_AVFILTERS_NB 64 static AVFilter *registered_avfilters[MAX_REGISTERED_AVFILTERS_NB + 1]; static int next_registered_avfilter_idx = 0; AVFilter *avfilter_get_by_name(const char *name){    int i;     for (i = 0; registered_avfilters[i]; i++)        if (!strcmp(registered_avfilters[i]->name, name))            return registered_avfilters[i];     return NULL;} int avfilter_register(AVFilter *filter){    if (next_registered_avfilter_idx == MAX_REGISTERED_AVFILTERS_NB)        return -1;     registered_avfilters[next_registered_avfilter_idx++] = filter;    return 0;} AVFilter **av_filter_next(AVFilter **filter){    return filter ? ++filter : &registered_avfilters[0];} void avfilter_uninit(void){    memset(registered_avfilters, 0, sizeof(registered_avfilters));    next_registered_avfilter_idx = 0;} static int pad_count(const AVFilterPad *pads){    int count;     for(count = 0; pads->name; count ++) pads ++;    return count;} static const char *filter_name(void *p){    AVFilterContext *filter = p;    return filter->filter->name;} static const AVClass avfilter_class = {    "AVFilter",    filter_name,    NULL,    LIBAVUTIL_VERSION_INT,}; AVFilterContext *avfilter_open(AVFilter *filter, const char *inst_name){    AVFilterContext *ret;     if (!filter)        return 0;     ret = av_mallocz(sizeof(AVFilterContext));     ret->av_class = &avfilter_class;    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);    if (ret->input_count) {        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);    if (ret->output_count) {        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_free(filter);} int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque){    int ret=0;     if(filter->filter->init)        ret = filter->filter->init(filter, args, opaque);    return ret;}