fftools/ffmpeg: move freeing a filtergraph into a separate function

fftools/ffmpeg.c

@@ -487,51 +487,15 @@ const AVIOInterruptCB int_cb = { decode_interrupt_cb, NULL };
 
 static void ffmpeg_cleanup(int ret)
 {
-    int i, j;
+    int i;
 
     if (do_benchmark) {
         int maxrss = getmaxrss() / 1024;
         av_log(NULL, AV_LOG_INFO, "bench: maxrss=%ikB\n", maxrss);
     }
 
-    for (i = 0; i < nb_filtergraphs; i++) {
-        FilterGraph *fg = filtergraphs[i];
-        avfilter_graph_free(&fg->graph);
-        for (j = 0; j < fg->nb_inputs; j++) {
-            InputFilter *ifilter = fg->inputs[j];
-            struct InputStream *ist = ifilter->ist;
-
-            if (ifilter->frame_queue) {
-                AVFrame *frame;
-                while (av_fifo_read(ifilter->frame_queue, &frame, 1) >= 0)
-                    av_frame_free(&frame);
-                av_fifo_freep2(&ifilter->frame_queue);
-            }
-            av_freep(&ifilter->displaymatrix);
-            if (ist->sub2video.sub_queue) {
-                AVSubtitle sub;
-                while (av_fifo_read(ist->sub2video.sub_queue, &sub, 1) >= 0)
-                    avsubtitle_free(&sub);
-                av_fifo_freep2(&ist->sub2video.sub_queue);
-            }
-            av_buffer_unref(&ifilter->hw_frames_ctx);
-            av_freep(&ifilter->name);
-            av_freep(&fg->inputs[j]);
-        }
-        av_freep(&fg->inputs);
-        for (j = 0; j < fg->nb_outputs; j++) {
-            OutputFilter *ofilter = fg->outputs[j];
-
-            avfilter_inout_free(&ofilter->out_tmp);
-            av_freep(&ofilter->name);
-            av_channel_layout_uninit(&ofilter->ch_layout);
-            av_freep(&fg->outputs[j]);
-        }
-        av_freep(&fg->outputs);
-        av_freep(&fg->graph_desc);
-
-        av_freep(&filtergraphs[i]);
-    }
+    for (i = 0; i < nb_filtergraphs; i++)
+        fg_free(&filtergraphs[i]);
     av_freep(&filtergraphs);
 
     /* close files */

fftools/ffmpeg.h

@@ -814,6 +814,8 @@ int ifilter_has_all_input_formats(FilterGraph *fg);
  */
 FilterGraph *fg_create(char *graph_desc);
 
+void fg_free(FilterGraph **pfg);
+
 /**
  * Perform a step of transcoding for the specified filter graph.
  *

fftools/ffmpeg_filter.c

@@ -189,6 +189,50 @@ static OutputFilter *ofilter_alloc(FilterGraph *fg)
     return ofilter;
 }
 
+void fg_free(FilterGraph **pfg)
+{
+    FilterGraph *fg = *pfg;
+
+    if (!fg)
+        return;
+
+        avfilter_graph_free(&fg->graph);
+        for (int j = 0; j < fg->nb_inputs; j++) {
+            InputFilter *ifilter = fg->inputs[j];
+            struct InputStream *ist = ifilter->ist;
+
+            if (ifilter->frame_queue) {
+                AVFrame *frame;
+                while (av_fifo_read(ifilter->frame_queue, &frame, 1) >= 0)
+                    av_frame_free(&frame);
+                av_fifo_freep2(&ifilter->frame_queue);
+            }
+            av_freep(&ifilter->displaymatrix);
+            if (ist->sub2video.sub_queue) {
+                AVSubtitle sub;
+                while (av_fifo_read(ist->sub2video.sub_queue, &sub, 1) >= 0)
+                    avsubtitle_free(&sub);
+                av_fifo_freep2(&ist->sub2video.sub_queue);
+            }
+            av_buffer_unref(&ifilter->hw_frames_ctx);
+            av_freep(&ifilter->name);
+            av_freep(&fg->inputs[j]);
+        }
+        av_freep(&fg->inputs);
+        for (int j = 0; j < fg->nb_outputs; j++) {
+            OutputFilter *ofilter = fg->outputs[j];
+
+            avfilter_inout_free(&ofilter->out_tmp);
+            av_freep(&ofilter->name);
+            av_channel_layout_uninit(&ofilter->ch_layout);
+            av_freep(&fg->outputs[j]);
+        }
+        av_freep(&fg->outputs);
+        av_freep(&fg->graph_desc);
+
+    av_freep(pfg);
+}
+
 FilterGraph *fg_create(char *graph_desc)
 {
     FilterGraph *fg;