ffmpeg/libavfilter/avfiltergraph.c

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/*
* Filter graphs
* 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 <string.h>
#include <stddef.h>
#include "avstring.h"
#include "avfilter.h"
#include "avfiltergraph.h"
typedef struct AVFilterGraph {
unsigned filter_count;
AVFilterContext **filters;
/** fake filter to handle links to internal filters */
AVFilterContext *link_filter;
} GraphContext;
typedef struct {
AVFilterContext *graph;
} GraphLinkContext;
static int link_init(AVFilterContext *ctx, const char *args, void *opaque)
{
GraphLinkContext *linkctx = ctx->priv;
linkctx->graph = opaque;
return !opaque;
}
/* given the link between the dummy filter and an internal filter whose input
* is being exported outside the graph, this returns the externally visible
* link */
static inline AVFilterLink *get_extern_input_link(AVFilterLink *link)
{
GraphLinkContext *lctx = link->src->priv;
return lctx->graph->inputs[link->srcpad];
}
/** query the formats supported by a filter providing input to the graph */
static int *link_in_query_formats(AVFilterLink *link)
{
AVFilterLink *link2 = get_extern_input_link(link);
int *(*query_formats)(AVFilterLink *);
if(!link2)
return avfilter_make_format_list(0);
if(!(query_formats = link2->src->output_pads[link2->srcpad].query_formats))
query_formats = avfilter_default_query_output_formats;
return query_formats(link2);
}
/** request a frame from a filter providing input to the graph */
static int link_in_request_frame(AVFilterLink *link)
{
AVFilterLink *link2 = get_extern_input_link(link);
if(!link2)
return -1;
return avfilter_request_frame(link2);
}
static int link_in_config_props(AVFilterLink *link)
{
AVFilterLink *link2 = get_extern_input_link(link);
int (*config_props)(AVFilterLink *);
int ret;
if(!link2)
return -1;
if(!(config_props = link2->src->output_pads[link2->srcpad].config_props))
config_props = avfilter_default_config_output_link;
ret = config_props(link2);
link->w = link2->w;
link->h = link2->h;
return ret;
}
/* given the link between the dummy filter and an internal filter whose input
* is being exported outside the graph, this returns the externally visible
* link */
static inline AVFilterLink *get_extern_output_link(AVFilterLink *link)
{
GraphLinkContext *lctx = link->dst->priv;
return lctx->graph->outputs[link->dstpad];
}
/** query the formats supported by a filter taking output from the graph */
static int *link_out_query_formats(AVFilterLink *link)
{
AVFilterLink *link2 = get_extern_output_link(link);
if(!link2)
return avfilter_make_format_list(0);
return link2->dst->input_pads[link2->dstpad].query_formats(link2);
}
static int link_out_config_props(AVFilterLink *link)
{
AVFilterLink *link2 = get_extern_output_link(link);
int (*config_props)(AVFilterLink *);
if(!link2)
return 0;
link2->w = link->w;
link2->h = link->h;
if(!(config_props = link2->dst->input_pads[link2->dstpad].config_props))
config_props = avfilter_default_config_input_link;
return config_props(link2);
}
static void link_out_start_frame(AVFilterLink *link, AVFilterPicRef *picref)
{
AVFilterLink *link2 = get_extern_output_link(link);
if(!link2)
avfilter_unref_pic(picref);
else
avfilter_start_frame(link2, picref);
}
static void link_out_end_frame(AVFilterLink *link)
{
AVFilterLink *link2 = get_extern_output_link(link);
if(link2)
avfilter_end_frame(link2);
}
static AVFilterPicRef *link_out_get_video_buffer(AVFilterLink *link, int perms)
{
AVFilterLink *link2 = get_extern_output_link(link);
if(!link2)
return NULL;
else
return avfilter_get_video_buffer(link2, perms);
}
static void link_out_draw_slice(AVFilterLink *link, uint8_t *data[4], int y,
int height)
{
AVFilterLink *link2 = get_extern_output_link(link);
if(link2)
avfilter_draw_slice(link2, data, y, height);
}
/** dummy filter used to help export filters pads outside the graph */
static AVFilter vf_graph_dummy =
{
.name = "graph_dummy",
.author = "Bobby Bingham",
.priv_size = sizeof(GraphLinkContext),
.init = link_init,
//.uninit = uninit,
.inputs = (AVFilterPad[]) {{ .name = NULL, }},
.outputs = (AVFilterPad[]) {{ .name = NULL, }},
};
static AVFilterLink *get_intern_input_link(AVFilterLink *link)
{
GraphContext *graph = link->dst->priv;
return graph->link_filter->outputs[link->dstpad];
}
static void graph_in_start_frame(AVFilterLink *link, AVFilterPicRef *picref)
{
AVFilterLink *link2 = get_intern_input_link(link);
if(link2)
avfilter_start_frame(link2, picref);
}
static void graph_in_end_frame(AVFilterLink *link)
{
AVFilterLink *link2 = get_intern_input_link(link);
if(link2)
avfilter_end_frame(link2);
}
static AVFilterPicRef *graph_in_get_video_buffer(AVFilterLink *link, int perms)
{
AVFilterLink *link2 = get_intern_input_link(link);
if(link2)
return avfilter_get_video_buffer(link2, perms);
return NULL;
}
static void graph_in_draw_slice(AVFilterLink *link, uint8_t *data[4], int y, int height)
{
AVFilterLink *link2 = get_intern_input_link(link);
if(link2)
avfilter_draw_slice(link2, data, y, height);
}
static int *graph_in_query_formats(AVFilterLink *link)
{
AVFilterLink *link2 = get_intern_input_link(link);
if(!link2 || !link2->dst->input_pads[link2->dstpad].query_formats)
return avfilter_make_format_list(0);
return link2->dst->input_pads[link2->dstpad].query_formats(link2);
}
static int graph_in_config_props(AVFilterLink *link)
{
AVFilterLink *link2 = get_intern_input_link(link);
int (*config_props)(AVFilterLink *);
if(!link2)
return -1;
/* copy link properties over to the dummy internal link */
link2->w = link->w;
link2->h = link->h;
link2->format = link->format;
if(!(config_props = link2->dst->input_pads[link2->dstpad].config_props))
return 0; /* FIXME? */
//config_props = avfilter_default_config_input_link;
return config_props(link2);
}
static AVFilterLink *get_intern_output_link(AVFilterLink *link)
{
GraphContext *graph = link->src->priv;
return graph->link_filter->inputs[link->srcpad];
}
static int *graph_out_query_formats(AVFilterLink *link)
{
AVFilterLink *link2 = get_intern_output_link(link);
if(!link2)
return avfilter_make_format_list(0);
if(!link2->src->output_pads[link2->srcpad].query_formats)
return avfilter_default_query_output_formats(link2);
return link2->src->output_pads[link2->srcpad].query_formats(link2);
}
static int graph_out_request_frame(AVFilterLink *link)
{
AVFilterLink *link2 = get_intern_output_link(link);
if(link2)
return avfilter_request_frame(link2);
return -1;
}
static int graph_out_config_props(AVFilterLink *link)
{
AVFilterLink *link2 = get_intern_output_link(link);
int (*config_props)(AVFilterLink *);
int ret;
if(!link2)
return 0;
link2->w = link->w;
link2->h = link->h;
link2->format = link->format;
if(!(config_props = link2->src->output_pads[link2->srcpad].config_props))
config_props = avfilter_default_config_output_link;
ret = config_props(link2);
link->w = link2->w;
link->h = link2->h;
link->format = link2->format;
return ret;
}
static int add_graph_input(AVFilterContext *gctx, AVFilterContext *filt, unsigned idx,
char *name)
{
GraphContext *graph = gctx->priv;
AVFilterPad graph_inpad =
{
.name = name,
.type = AV_PAD_VIDEO,
.start_frame = graph_in_start_frame,
.end_frame = graph_in_end_frame,
.get_video_buffer = graph_in_get_video_buffer,
.draw_slice = graph_in_draw_slice,
.query_formats = graph_in_query_formats,
.config_props = graph_in_config_props,
/* XXX */
};
AVFilterPad dummy_outpad =
{
.name = NULL, /* FIXME? */
.type = AV_PAD_VIDEO,
.query_formats = link_in_query_formats,
.request_frame = link_in_request_frame,
.config_props = link_in_config_props,
};
avfilter_insert_inpad (gctx, gctx->input_count, &graph_inpad);
avfilter_insert_outpad(graph->link_filter, graph->link_filter->output_count,
&dummy_outpad);
return avfilter_link(graph->link_filter,
graph->link_filter->output_count-1, filt, idx);
}
static int add_graph_output(AVFilterContext *gctx, AVFilterContext *filt, unsigned idx,
char *name)
{
GraphContext *graph = gctx->priv;
AVFilterPad graph_outpad =
{
.name = name,
.type = AV_PAD_VIDEO,
.request_frame = graph_out_request_frame,
.query_formats = graph_out_query_formats,
.config_props = graph_out_config_props,
};
AVFilterPad dummy_inpad =
{
.name = NULL, /* FIXME? */
.type = AV_PAD_VIDEO,
.start_frame = link_out_start_frame,
.end_frame = link_out_end_frame,
.draw_slice = link_out_draw_slice,
.get_video_buffer = link_out_get_video_buffer,
.query_formats = link_out_query_formats,
.config_props = link_out_config_props,
};
avfilter_insert_outpad(gctx, gctx->output_count, &graph_outpad);
avfilter_insert_inpad (graph->link_filter, graph->link_filter->input_count,
&dummy_inpad);
return avfilter_link(filt, idx, graph->link_filter,
graph->link_filter->input_count-1);
}
static void uninit(AVFilterContext *ctx)
{
GraphContext *graph = ctx->priv;
if(graph->link_filter) {
avfilter_destroy(graph->link_filter);
graph->link_filter = NULL;
}
for(; graph->filter_count > 0; graph->filter_count --)
avfilter_destroy(graph->filters[graph->filter_count - 1]);
av_freep(&graph->filters);
}
void avfilter_graph_add_filter(AVFilterContext *graphctx, AVFilterContext *filter)
{
GraphContext *graph = graphctx->priv;
graph->filters = av_realloc(graph->filters,
sizeof(AVFilterContext*) * ++graph->filter_count);
graph->filters[graph->filter_count - 1] = filter;
}
int avfilter_graph_config_links(AVFilterContext *graphctx)
{
GraphContext *graph = graphctx->priv;
int i, j;
for(i = 0; i < graph->filter_count; i ++) {
for(j = 0; j < graph->filters[i]->input_count; j ++)
if(avfilter_config_link(graph->filters[i]->inputs[j]))
return -1;
}
return 0;
}
static AVFilterContext *create_filter_with_args(const char *filt, void *opaque)
{
AVFilterContext *ret;
char *filter = av_strdup(filt); /* copy - don't mangle the input string */
char *name, *args;
name = filter;
if((args = strchr(filter, '='))) {
/* ensure we at least have a name */
if(args == filter)
goto fail;
*args ++ = 0;
}
av_log(NULL, AV_LOG_INFO, "creating filter \"%s\" with args \"%s\"\n",
name, args ? args : "(none)");
if((ret = avfilter_create_by_name(name, NULL))) {
if(avfilter_init_filter(ret, args, opaque)) {
av_log(NULL, AV_LOG_ERROR, "error initializing filter!\n");
avfilter_destroy(ret);
goto fail;
}
} else av_log(NULL, AV_LOG_ERROR, "error creating filter!\n");
av_free(filter);
return ret;
fail:
av_free(filter);
return NULL;
}
static int graph_load_chain(AVFilterContext *graphctx,
unsigned count, char **filter_list, void **opaque,
AVFilterContext **first, AVFilterContext **last)
{
unsigned i;
AVFilterContext *filters[2] = {NULL,NULL};
for(i = 0; i < count; i ++) {
void *op;
if(opaque) op = opaque[i];
else op = NULL;
if(!(filters[1] = create_filter_with_args(filter_list[i], op)))
goto fail;
if(i == 0) {
if(first) *first = filters[1];
} else {
if(avfilter_link(filters[0], 0, filters[1], 0)) {
av_log(NULL, AV_LOG_ERROR, "error linking filters!\n");
goto fail;
}
}
avfilter_graph_add_filter(graphctx, filters[1]);
if(i == 0 && filters[1]->input_count > 0)
add_graph_input(graphctx, filters[1], 0, "default");
filters[0] = filters[1];
}
if(filters[1]->output_count > 0)
add_graph_output(graphctx, filters[1], 0, "default");
if(last) *last = filters[1];
return 0;
fail:
uninit(graphctx);
if(first) *first = NULL;
if(last) *last = NULL;
return -1;
}
static int graph_load_chain_from_string(AVFilterContext *ctx, const char *str,
AVFilterContext **first,
AVFilterContext **last)
{
int count, ret = 0;
char **strings;
char *filt;
strings = av_malloc(sizeof(char *));
strings[0] = av_strdup(str);
filt = strchr(strings[0], ',');
for(count = 1; filt; count ++) {
if(filt == strings[count-1]) {
ret = -1;
goto done;
}
strings = av_realloc(strings, sizeof(char *) * (count+1));
strings[count] = filt + 1;
*filt = '\0';
filt = strchr(strings[count], ',');
}
ret = graph_load_chain(ctx, count, strings, NULL, first, last);
done:
av_free(strings[0]);
av_free(strings);
return ret;
}
static int init(AVFilterContext *ctx, const char *args, void *opaque)
{
GraphContext *gctx = ctx->priv;
if(!args)
return 0;
if(!(gctx->link_filter = avfilter_create(&vf_graph_dummy, NULL)))
return -1;
if(avfilter_init_filter(gctx->link_filter, NULL, ctx))
goto fail;
return graph_load_chain_from_string(ctx, args, NULL, NULL);
fail:
avfilter_destroy(gctx->link_filter);
return -1;
}
AVFilter vf_graph =
{
.name = "graph",
.author = "Bobby Bingham",
.priv_size = sizeof(GraphContext),
.init = init,
.uninit = uninit,
.inputs = (AVFilterPad[]) {{ .name = NULL, }},
.outputs = (AVFilterPad[]) {{ .name = NULL, }},
};