00001
00002
00003
00004
00005
00006
00007
00008
00009
00010
00011
00012
00013
00014
00015
00016
00017
00018
00019
00020
00021
00022
00023 #include <ctype.h>
00024 #include <string.h>
00025
00026 #include "avfilter.h"
00027 #include "avfiltergraph.h"
00028
00029 void avfilter_graph_destroy(AVFilterGraph *graph)
00030 {
00031 for(; graph->filter_count > 0; graph->filter_count --)
00032 avfilter_destroy(graph->filters[graph->filter_count - 1]);
00033 av_freep(&graph->scale_sws_opts);
00034 av_freep(&graph->filters);
00035 }
00036
00037 int avfilter_graph_add_filter(AVFilterGraph *graph, AVFilterContext *filter)
00038 {
00039 AVFilterContext **filters = av_realloc(graph->filters,
00040 sizeof(AVFilterContext*) * (graph->filter_count+1));
00041 if (!filters)
00042 return AVERROR(ENOMEM);
00043
00044 graph->filters = filters;
00045 graph->filters[graph->filter_count++] = filter;
00046
00047 return 0;
00048 }
00049
00050 int avfilter_graph_check_validity(AVFilterGraph *graph, AVClass *log_ctx)
00051 {
00052 AVFilterContext *filt;
00053 int i, j;
00054
00055 for (i=0; i < graph->filter_count; i++) {
00056 filt = graph->filters[i];
00057
00058 for (j = 0; j < filt->input_count; j++) {
00059 if (!filt->inputs[j] || !filt->inputs[j]->src) {
00060 av_log(log_ctx, AV_LOG_ERROR,
00061 "Input pad \"%s\" for the filter \"%s\" of type \"%s\" not connected to any source\n",
00062 filt->input_pads[j].name, filt->name, filt->filter->name);
00063 return -1;
00064 }
00065 }
00066
00067 for (j = 0; j < filt->output_count; j++) {
00068 if (!filt->outputs[j] || !filt->outputs[j]->dst) {
00069 av_log(log_ctx, AV_LOG_ERROR,
00070 "Output pad \"%s\" for the filter \"%s\" of type \"%s\" not connected to any destination\n",
00071 filt->output_pads[j].name, filt->name, filt->filter->name);
00072 return -1;
00073 }
00074 }
00075 }
00076
00077 return 0;
00078 }
00079
00080 int avfilter_graph_config_links(AVFilterGraph *graph, AVClass *log_ctx)
00081 {
00082 AVFilterContext *filt;
00083 int i, ret;
00084
00085 for (i=0; i < graph->filter_count; i++) {
00086 filt = graph->filters[i];
00087
00088 if (!filt->output_count) {
00089 if ((ret = avfilter_config_links(filt)))
00090 return ret;
00091 }
00092 }
00093
00094 return 0;
00095 }
00096
00097 AVFilterContext *avfilter_graph_get_filter(AVFilterGraph *graph, char *name)
00098 {
00099 int i;
00100
00101 for(i = 0; i < graph->filter_count; i ++)
00102 if(graph->filters[i]->name && !strcmp(name, graph->filters[i]->name))
00103 return graph->filters[i];
00104
00105 return NULL;
00106 }
00107
00108 static int query_formats(AVFilterGraph *graph, AVClass *log_ctx)
00109 {
00110 int i, j;
00111 int scaler_count = 0;
00112 char inst_name[30];
00113
00114
00115 for(i = 0; i < graph->filter_count; i ++) {
00116 if(graph->filters[i]->filter->query_formats)
00117 graph->filters[i]->filter->query_formats(graph->filters[i]);
00118 else
00119 avfilter_default_query_formats(graph->filters[i]);
00120 }
00121
00122
00123 for(i = 0; i < graph->filter_count; i ++) {
00124 AVFilterContext *filter = graph->filters[i];
00125
00126 for(j = 0; j < filter->input_count; j ++) {
00127 AVFilterLink *link = filter->inputs[j];
00128 if(link && link->in_formats != link->out_formats) {
00129 if(!avfilter_merge_formats(link->in_formats,
00130 link->out_formats)) {
00131 AVFilterContext *scale;
00132 char scale_args[256];
00133
00134 snprintf(inst_name, sizeof(inst_name), "auto-inserted scaler %d",
00135 scaler_count++);
00136 scale =
00137 avfilter_open(avfilter_get_by_name("scale"),inst_name);
00138
00139 snprintf(scale_args, sizeof(scale_args), "0:0:%s", graph->scale_sws_opts);
00140 if(!scale || scale->filter->init(scale, scale_args, NULL) ||
00141 avfilter_insert_filter(link, scale, 0, 0)) {
00142 avfilter_destroy(scale);
00143 return -1;
00144 }
00145
00146 if (avfilter_graph_add_filter(graph, scale) < 0)
00147 return -1;
00148
00149 scale->filter->query_formats(scale);
00150 if (((link = scale-> inputs[0]) &&
00151 !avfilter_merge_formats(link->in_formats, link->out_formats)) ||
00152 ((link = scale->outputs[0]) &&
00153 !avfilter_merge_formats(link->in_formats, link->out_formats))) {
00154 av_log(log_ctx, AV_LOG_ERROR,
00155 "Impossible to convert between the formats supported by the filter "
00156 "'%s' and the filter '%s'\n", link->src->name, link->dst->name);
00157 return -1;
00158 }
00159 }
00160 }
00161 }
00162 }
00163
00164 return 0;
00165 }
00166
00167 static void pick_format(AVFilterLink *link)
00168 {
00169 if(!link || !link->in_formats)
00170 return;
00171
00172 link->in_formats->format_count = 1;
00173 link->format = link->in_formats->formats[0];
00174
00175 avfilter_formats_unref(&link->in_formats);
00176 avfilter_formats_unref(&link->out_formats);
00177 }
00178
00179 static void pick_formats(AVFilterGraph *graph)
00180 {
00181 int i, j;
00182
00183 for(i = 0; i < graph->filter_count; i ++) {
00184 AVFilterContext *filter = graph->filters[i];
00185
00186 for(j = 0; j < filter->input_count; j ++)
00187 pick_format(filter->inputs[j]);
00188 for(j = 0; j < filter->output_count; j ++)
00189 pick_format(filter->outputs[j]);
00190 }
00191 }
00192
00193 int avfilter_graph_config_formats(AVFilterGraph *graph, AVClass *log_ctx)
00194 {
00195
00196 if(query_formats(graph, log_ctx))
00197 return -1;
00198
00199
00200
00201 pick_formats(graph);
00202
00203 return 0;
00204 }
00205