1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
|
/*
* filter graphs
* Copyright (c) 2008 Vitor Sessak
* 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 <ctype.h>
#include <string.h>
#include "avfilter.h"
#include "avfiltergraph.h"
#include "internal.h"
AVFilterGraph *avfilter_graph_alloc(void)
{
return av_mallocz(sizeof(AVFilterGraph));
}
void avfilter_graph_free(AVFilterGraph *graph)
{
for(; graph->filter_count > 0; graph->filter_count --)
avfilter_free(graph->filters[graph->filter_count - 1]);
av_freep(&graph->scale_sws_opts);
av_freep(&graph->filters);
}
int avfilter_graph_add_filter(AVFilterGraph *graph, AVFilterContext *filter)
{
AVFilterContext **filters = av_realloc(graph->filters,
sizeof(AVFilterContext*) * (graph->filter_count+1));
if (!filters)
return AVERROR(ENOMEM);
graph->filters = filters;
graph->filters[graph->filter_count++] = filter;
return 0;
}
int ff_avfilter_graph_check_validity(AVFilterGraph *graph, AVClass *log_ctx)
{
AVFilterContext *filt;
int i, j;
for (i=0; i < graph->filter_count; i++) {
filt = graph->filters[i];
for (j = 0; j < filt->input_count; j++) {
if (!filt->inputs[j] || !filt->inputs[j]->src) {
av_log(log_ctx, AV_LOG_ERROR,
"Input pad \"%s\" for the filter \"%s\" of type \"%s\" not connected to any source\n",
filt->input_pads[j].name, filt->name, filt->filter->name);
return -1;
}
}
for (j = 0; j < filt->output_count; j++) {
if (!filt->outputs[j] || !filt->outputs[j]->dst) {
av_log(log_ctx, AV_LOG_ERROR,
"Output pad \"%s\" for the filter \"%s\" of type \"%s\" not connected to any destination\n",
filt->output_pads[j].name, filt->name, filt->filter->name);
return -1;
}
}
}
return 0;
}
int ff_avfilter_graph_config_links(AVFilterGraph *graph, AVClass *log_ctx)
{
AVFilterContext *filt;
int i, ret;
for (i=0; i < graph->filter_count; i++) {
filt = graph->filters[i];
if (!filt->output_count) {
if ((ret = avfilter_config_links(filt)))
return ret;
}
}
return 0;
}
AVFilterContext *avfilter_graph_get_filter(AVFilterGraph *graph, char *name)
{
int i;
for(i = 0; i < graph->filter_count; i ++)
if(graph->filters[i]->name && !strcmp(name, graph->filters[i]->name))
return graph->filters[i];
return NULL;
}
static int query_formats(AVFilterGraph *graph, AVClass *log_ctx)
{
int i, j;
int scaler_count = 0;
char inst_name[30];
/* ask all the sub-filters for their supported media formats */
for(i = 0; i < graph->filter_count; i ++) {
if(graph->filters[i]->filter->query_formats)
graph->filters[i]->filter->query_formats(graph->filters[i]);
else
avfilter_default_query_formats(graph->filters[i]);
}
/* go through and merge as many format lists as possible */
for(i = 0; i < graph->filter_count; i ++) {
AVFilterContext *filter = graph->filters[i];
for(j = 0; j < filter->input_count; j ++) {
AVFilterLink *link = filter->inputs[j];
if(link && link->in_formats != link->out_formats) {
if(!avfilter_merge_formats(link->in_formats,
link->out_formats)) {
AVFilterContext *scale;
char scale_args[256];
/* couldn't merge format lists. auto-insert scale filter */
snprintf(inst_name, sizeof(inst_name), "auto-inserted scaler %d",
scaler_count++);
avfilter_open(&scale, avfilter_get_by_name("scale"), inst_name);
snprintf(scale_args, sizeof(scale_args), "0:0:%s", graph->scale_sws_opts);
if(!scale || scale->filter->init(scale, scale_args, NULL) ||
avfilter_insert_filter(link, scale, 0, 0)) {
avfilter_free(scale);
return -1;
}
if (avfilter_graph_add_filter(graph, scale) < 0)
return -1;
scale->filter->query_formats(scale);
if (((link = scale-> inputs[0]) &&
!avfilter_merge_formats(link->in_formats, link->out_formats)) ||
((link = scale->outputs[0]) &&
!avfilter_merge_formats(link->in_formats, link->out_formats))) {
av_log(log_ctx, AV_LOG_ERROR,
"Impossible to convert between the formats supported by the filter "
"'%s' and the filter '%s'\n", link->src->name, link->dst->name);
return -1;
}
}
}
}
}
return 0;
}
static void pick_format(AVFilterLink *link)
{
if(!link || !link->in_formats)
return;
link->in_formats->format_count = 1;
link->format = link->in_formats->formats[0];
avfilter_formats_unref(&link->in_formats);
avfilter_formats_unref(&link->out_formats);
}
static void pick_formats(AVFilterGraph *graph)
{
int i, j;
for(i = 0; i < graph->filter_count; i ++) {
AVFilterContext *filter = graph->filters[i];
for(j = 0; j < filter->input_count; j ++)
pick_format(filter->inputs[j]);
for(j = 0; j < filter->output_count; j ++)
pick_format(filter->outputs[j]);
}
}
int ff_avfilter_graph_config_formats(AVFilterGraph *graph, AVClass *log_ctx)
{
/* find supported formats from sub-filters, and merge along links */
if(query_formats(graph, log_ctx))
return -1;
/* Once everything is merged, it's possible that we'll still have
* multiple valid media format choices. We pick the first one. */
pick_formats(graph);
return 0;
}
int avfilter_graph_config(AVFilterGraph *graphctx, AVClass *log_ctx)
{
int ret;
if ((ret = ff_avfilter_graph_check_validity(graphctx, log_ctx)))
return ret;
if ((ret = ff_avfilter_graph_config_formats(graphctx, log_ctx)))
return ret;
if ((ret = ff_avfilter_graph_config_links(graphctx, log_ctx)))
return ret;
return 0;
}
|
