ffmpeg/libavfilter/avfilter.c

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/*
* 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 = -1;
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;
/* 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(link_dpad(link).draw_slice)
link_dpad(link).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_malloc(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);
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_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;
}