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 <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;
}