ffmpeg: factorize checking decoder result

Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Marton Balint <cus@passwd.hu>

ffmpeg.c

@@ -1925,6 +1925,15 @@ int guess_input_channel_layout(InputStream *ist)
     return 1;
 }
 
+static void check_decode_result(int *got_output, int ret)
+{
+    if (*got_output || ret<0)
+        decode_error_stat[ret<0] ++;
+
+    if (ret < 0 && exit_on_error)
+        exit_program(1);
+}
+
 static int decode_audio(InputStream *ist, AVPacket *pkt, int *got_output)
 {
     AVFrame *decoded_frame, *f;
@@ -1947,11 +1956,7 @@ static int decode_audio(InputStream *ist, AVPacket *pkt, int *got_output)
         ret = AVERROR_INVALIDDATA;
     }
 
-    if (*got_output || ret<0)
-        decode_error_stat[ret<0] ++;
-
-    if (ret < 0 && exit_on_error)
-        exit_program(1);
+    check_decode_result(got_output, ret);
 
     if (!*got_output || ret < 0)
         return ret;
@@ -2088,11 +2093,7 @@ static int decode_video(InputStream *ist, AVPacket *pkt, int *got_output)
                    ist->st->codec->has_b_frames);
     }
 
-    if (*got_output || ret<0)
-        decode_error_stat[ret<0] ++;
-
-    if (ret < 0 && exit_on_error)
-        exit_program(1);
+    check_decode_result(got_output, ret);
 
     if (*got_output && ret >= 0) {
         if (ist->dec_ctx->width  != decoded_frame->width ||
@@ -2200,11 +2201,7 @@ static int transcode_subtitles(InputStream *ist, AVPacket *pkt, int *got_output)
     int i, ret = avcodec_decode_subtitle2(ist->dec_ctx,
                                           &subtitle, got_output, pkt);
 
-    if (*got_output || ret<0)
-        decode_error_stat[ret<0] ++;
-
-    if (ret < 0 && exit_on_error)
-        exit_program(1);
+    check_decode_result(got_output, ret);
 
     if (ret < 0 || !*got_output) {
         if (!pkt->size)