Statistics
| Branch: | Revision:

ffmpeg / libavfilter / avfiltergraph.c @ 39c07b8e

History | View | Annotate | Download (5.94 KB)

1
/*
2
 * filter graphs
3
 * copyright (c) 2008 Vitor Sessak
4
 * copyright (c) 2007 Bobby Bingham
5
 *
6
 * This file is part of FFmpeg.
7
 *
8
 * FFmpeg is free software; you can redistribute it and/or
9
 * modify it under the terms of the GNU Lesser General Public
10
 * License as published by the Free Software Foundation; either
11
 * version 2.1 of the License, or (at your option) any later version.
12
 *
13
 * FFmpeg is distributed in the hope that it will be useful,
14
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16
 * Lesser General Public License for more details.
17
 *
18
 * You should have received a copy of the GNU Lesser General Public
19
 * License along with FFmpeg; if not, write to the Free Software
20
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21
 */
22

    
23
#include <ctype.h>
24
#include <string.h>
25

    
26
#include "avfilter.h"
27
#include "avfiltergraph.h"
28

    
29
void avfilter_destroy_graph(AVFilterGraph *graph)
30
{
31
    for(; graph->filter_count > 0; graph->filter_count --)
32
        avfilter_destroy(graph->filters[graph->filter_count - 1]);
33
    av_freep(&graph->scale_sws_opts);
34
    av_freep(&graph->filters);
35
}
36

    
37
int avfilter_graph_add_filter(AVFilterGraph *graph, AVFilterContext *filter)
38
{
39
    graph->filters = av_realloc(graph->filters,
40
                                sizeof(AVFilterContext*) * ++graph->filter_count);
41

    
42
    if (!graph->filters)
43
        return -1;
44

    
45
    graph->filters[graph->filter_count - 1] = filter;
46

    
47
    return 0;
48
}
49

    
50
int avfilter_graph_check_validity(AVFilterGraph *graph, AVClass *log_ctx)
51
{
52
    AVFilterContext *filt;
53
    int i, j;
54

    
55
    for (i=0; i < graph->filter_count; i++) {
56
        filt = graph->filters[i];
57

    
58
        for (j = 0; j < filt->input_count; j++) {
59
            if (!filt->inputs[j] || !filt->inputs[j]->src) {
60
                av_log(log_ctx, AV_LOG_ERROR,
61
                       "Input pad \"%s\" for the filter \"%s\" of type \"%s\" not connected to any source\n",
62
                       filt->input_pads[j].name, filt->name, filt->filter->name);
63
                return -1;
64
            }
65
        }
66

    
67
        for (j = 0; j < filt->output_count; j++) {
68
            if (!filt->outputs[j] || !filt->outputs[j]->dst) {
69
                av_log(log_ctx, AV_LOG_ERROR,
70
                       "Output pad \"%s\" for the filter \"%s\" of type \"%s\" not connected to any destination\n",
71
                       filt->output_pads[j].name, filt->name, filt->filter->name);
72
                return -1;
73
            }
74
        }
75
    }
76

    
77
    return 0;
78
}
79

    
80
AVFilterContext *avfilter_graph_get_filter(AVFilterGraph *graph, char *name)
81
{
82
    int i;
83

    
84
    for(i = 0; i < graph->filter_count; i ++)
85
        if(graph->filters[i]->name && !strcmp(name, graph->filters[i]->name))
86
            return graph->filters[i];
87

    
88
    return NULL;
89
}
90

    
91
static int query_formats(AVFilterGraph *graph)
92
{
93
    int i, j;
94
    int scaler_count = 0;
95
    char inst_name[30];
96

    
97
    /* ask all the sub-filters for their supported colorspaces */
98
    for(i = 0; i < graph->filter_count; i ++) {
99
        if(graph->filters[i]->filter->query_formats)
100
            graph->filters[i]->filter->query_formats(graph->filters[i]);
101
        else
102
            avfilter_default_query_formats(graph->filters[i]);
103
    }
104

    
105
    /* go through and merge as many format lists as possible */
106
    for(i = 0; i < graph->filter_count; i ++) {
107
        AVFilterContext *filter = graph->filters[i];
108

    
109
        for(j = 0; j < filter->input_count; j ++) {
110
            AVFilterLink *link = filter->inputs[j];
111
            if(link && link->in_formats != link->out_formats) {
112
                if(!avfilter_merge_formats(link->in_formats,
113
                                           link->out_formats)) {
114
                    AVFilterContext *scale;
115
                    char scale_args[256];
116
                    /* couldn't merge format lists. auto-insert scale filter */
117
                    snprintf(inst_name, sizeof(inst_name), "auto-inserted scaler %d",
118
                             scaler_count);
119
                    scale =
120
                        avfilter_open(avfilter_get_by_name("scale"),inst_name);
121

    
122
                    snprintf(scale_args, sizeof(scale_args), "0:0:%s", graph->scale_sws_opts);
123
                    if(!scale || scale->filter->init(scale, scale_args, NULL) ||
124
                                 avfilter_insert_filter(link, scale, 0, 0)) {
125
                        avfilter_destroy(scale);
126
                        return -1;
127
                    }
128

    
129
                    if (avfilter_graph_add_filter(graph, scale) < 0)
130
                        return -1;
131

    
132
                    scale->filter->query_formats(scale);
133
                    if(!avfilter_merge_formats(scale-> inputs[0]->in_formats,
134
                                               scale-> inputs[0]->out_formats)||
135
                       !avfilter_merge_formats(scale->outputs[0]->in_formats,
136
                                               scale->outputs[0]->out_formats))
137
                        return -1;
138
                }
139
            }
140
        }
141
    }
142

    
143
    return 0;
144
}
145

    
146
static void pick_format(AVFilterLink *link)
147
{
148
    if(!link || !link->in_formats)
149
        return;
150

    
151
    link->in_formats->format_count = 1;
152
    link->format = link->in_formats->formats[0];
153

    
154
    avfilter_formats_unref(&link->in_formats);
155
    avfilter_formats_unref(&link->out_formats);
156
}
157

    
158
static void pick_formats(AVFilterGraph *graph)
159
{
160
    int i, j;
161

    
162
    for(i = 0; i < graph->filter_count; i ++) {
163
        AVFilterContext *filter = graph->filters[i];
164

    
165
        for(j = 0; j < filter->input_count; j ++)
166
            pick_format(filter->inputs[j]);
167
        for(j = 0; j < filter->output_count; j ++)
168
            pick_format(filter->outputs[j]);
169
    }
170
}
171

    
172
int avfilter_graph_config_formats(AVFilterGraph *graph)
173
{
174
    /* find supported formats from sub-filters, and merge along links */
175
    if(query_formats(graph))
176
        return -1;
177

    
178
    /* Once everything is merged, it's possible that we'll still have
179
     * multiple valid colorspace choices. We pick the first one. */
180
    pick_formats(graph);
181

    
182
    return 0;
183
}
184