| /* |
| * 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 "libavcodec/imgconvert.h" |
| #include "avfilter.h" |
| |
| unsigned avfilter_version(void) { |
| return LIBAVFILTER_VERSION_INT; |
| } |
| |
| /** 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)) |
| 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'\n", |
| filt->filter->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; |
| } |
| |
| 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; |
| } |
| |
| 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++) { |
| if(!link->src->inputs[i]) |
| return -1; |
| min = FFMIN(min, avfilter_poll_frame(link->src->inputs[i])); |
| } |
| |
| 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); |
| |
| 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->srcpic = picref; |
| link->cur_pic->pts = link->srcpic->pts; |
| } |
| 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) |
| { |
| uint8_t *src[4], *dst[4]; |
| int i, j, hsub, vsub; |
| void (*draw_slice)(AVFilterLink *, int, int); |
| |
| /* copy the slice if needed for permission reasons */ |
| if(link->srcpic) { |
| avcodec_get_chroma_sub_sample(link->format, &hsub, &vsub); |
| |
| 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); |
| } |
| |
| AVFilter *avfilter_get_by_name(const char *name) |
| { |
| struct FilterList *filt; |
| |
| for(filt = filters; filt; filt = filt->next) |
| if(!strcmp(filt->filter->name, name)) |
| return filt->filter; |
| |
| return NULL; |
| } |
| |
| void avfilter_register(AVFilter *filter) |
| { |
| struct FilterList *newfilt = av_malloc(sizeof(struct FilterList)); |
| |
| newfilt->filter = filter; |
| newfilt->next = filters; |
| filters = newfilt; |
| } |
| |
| void avfilter_uninit(void) |
| { |
| struct FilterList *tmp; |
| |
| for(; filters; filters = tmp) { |
| tmp = filters->next; |
| av_free(filters); |
| } |
| } |
| |
| 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 |
| }; |
| |
| 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; |
| } |
| |