fftools/ffmpeg_opt: factor auto-mapping audio out of open_output_file()

fftools/ffmpeg_opt.c

@@ -2541,6 +2541,44 @@ static void map_auto_video(OutputFile *of, AVFormatContext *oc,
         new_video_stream(o, oc, idx);
 }
 
+static void map_auto_audio(OutputFile *of, AVFormatContext *oc,
+                           OptionsContext *o)
+{
+    InputStream *ist;
+
+        /* audio: most channels */
+        if (av_guess_codec(oc->oformat, NULL, oc->url, NULL, AVMEDIA_TYPE_AUDIO) != AV_CODEC_ID_NONE) {
+            int best_score = 0, idx = -1;
+            for (int j = 0; j < nb_input_files; j++) {
+                InputFile *ifile = input_files[j];
+                int file_best_score = 0, file_best_idx = -1;
+                for (int i = 0; i < ifile->nb_streams; i++) {
+                    int score;
+                    ist = input_streams[ifile->ist_index + i];
+                    score = ist->st->codecpar->ch_layout.nb_channels
+                            + 100000000 * !!(ist->st->event_flags & AVSTREAM_EVENT_FLAG_NEW_PACKETS)
+                            + 5000000*!!(ist->st->disposition & AV_DISPOSITION_DEFAULT);
+                    if (ist->user_set_discard == AVDISCARD_ALL)
+                        continue;
+                    if (ist->st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO &&
+                        score > file_best_score) {
+                        file_best_score = score;
+                        file_best_idx = ifile->ist_index + i;
+                    }
+                }
+                if (file_best_idx >= 0) {
+                    file_best_score -= 5000000*!!(input_streams[file_best_idx]->st->disposition & AV_DISPOSITION_DEFAULT);
+                    if (file_best_score > best_score) {
+                        best_score = file_best_score;
+                        idx = file_best_idx;
+                    }
+               }
+            }
+            if (idx >= 0)
+                new_audio_stream(o, oc, idx);
+        }
+}
+
 static int open_output_file(OptionsContext *o, const char *filename)
 {
     AVFormatContext *oc;
@@ -2621,38 +2659,9 @@ static int open_output_file(OptionsContext *o, const char *filename)
         /* pick the "best" stream of each type */
         if (!o->video_disable)
             map_auto_video(of, oc, o);
+        if (!o->audio_disable)
+            map_auto_audio(of, oc, o);
 
-        /* audio: most channels */
-        if (!o->audio_disable && av_guess_codec(oc->oformat, NULL, filename, NULL, AVMEDIA_TYPE_AUDIO) != AV_CODEC_ID_NONE) {
-            int best_score = 0, idx = -1;
-            for (j = 0; j < nb_input_files; j++) {
-                InputFile *ifile = input_files[j];
-                int file_best_score = 0, file_best_idx = -1;
-                for (i = 0; i < ifile->nb_streams; i++) {
-                    int score;
-                    ist = input_streams[ifile->ist_index + i];
-                    score = ist->st->codecpar->ch_layout.nb_channels
-                            + 100000000 * !!(ist->st->event_flags & AVSTREAM_EVENT_FLAG_NEW_PACKETS)
-                            + 5000000*!!(ist->st->disposition & AV_DISPOSITION_DEFAULT);
-                    if (ist->user_set_discard == AVDISCARD_ALL)
-                        continue;
-                    if (ist->st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO &&
-                        score > file_best_score) {
-                        file_best_score = score;
-                        file_best_idx = ifile->ist_index + i;
-                    }
-                }
-                if (file_best_idx >= 0) {
-                    file_best_score -= 5000000*!!(input_streams[file_best_idx]->st->disposition & AV_DISPOSITION_DEFAULT);
-                    if (file_best_score > best_score) {
-                        best_score = file_best_score;
-                        idx = file_best_idx;
-                    }
-               }
-            }
-            if (idx >= 0)
-                new_audio_stream(o, oc, idx);
-        }
 
         /* subtitles: pick first */
         MATCH_PER_TYPE_OPT(codec_names, str, subtitle_codec_name, oc, "s");