ffprobe: Fix NULL pointer handling in color parameter printing

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

ffprobe.c

@@ -1925,6 +1925,26 @@ static void print_pkt_side_data(WriterContext *w,
     writer_print_section_footer(w);
 }
 
+static void print_color_range(WriterContext *w, enum AVColorRange color_range, const char *fallback)
+{
+    const char *val = av_color_range_name(color_range);
+    if (!val || color_range == AVCOL_RANGE_UNSPECIFIED) {
+        print_str_opt("color_range", fallback);
+    } else {
+        print_str("color_range", val);
+    }
+}
+
+static void print_color_space(WriterContext *w, enum AVColorSpace color_space)
+{
+    const char *val = av_color_space_name(color_space);
+    if (!val || color_space == AVCOL_SPC_UNSPECIFIED) {
+        print_str_opt("color_space", "unknown");
+    } else {
+        print_str("color_space", val);
+    }
+}
+
 static void print_primaries(WriterContext *w, enum AVColorPrimaries color_primaries)
 {
     const char *val = av_color_primaries_name(color_primaries);
@@ -1935,6 +1955,27 @@ static void print_primaries(WriterContext *w, enum AVColorPrimaries color_primar
     }
 }
 
+static void print_color_trc(WriterContext *w, enum AVColorTransferCharacteristic color_trc)
+{
+    const char *val = av_color_transfer_name(color_trc);
+    if (!val || color_trc == AVCOL_TRC_UNSPECIFIED) {
+        print_str_opt("color_transfer", "unknown");
+    } else {
+        print_str("color_transfer", val);
+    }
+}
+
+static void print_chroma_location(WriterContext *w, enum AVChromaLocation chroma_location)
+{
+    const char *val = av_chroma_location_name(chroma_location);
+    if (!val || chroma_location == AVCHROMA_LOC_UNSPECIFIED) {
+        print_str_opt("chroma_location", "unspecified");
+    } else {
+        print_str("chroma_location", val);
+    }
+}
+
+
 static void clear_log(int need_lock)
 {
     int i;
@@ -2116,27 +2157,11 @@ static void show_frame(WriterContext *w, AVFrame *frame, AVStream *stream,
         print_int("top_field_first",        frame->top_field_first);
         print_int("repeat_pict",            frame->repeat_pict);
 
-        if (frame->color_range != AVCOL_RANGE_UNSPECIFIED)
-            print_str("color_range", av_color_range_name(frame->color_range));
-        else
-            print_str_opt("color_range", av_color_range_name(frame->color_range));
-
-        if (frame->colorspace != AVCOL_SPC_UNSPECIFIED)
-            print_str("color_space", av_color_space_name(frame->colorspace));
-        else
-            print_str_opt("color_space", av_color_space_name(frame->colorspace));
-
+        print_color_range(w, frame->color_range, "unknown");
+        print_color_space(w, frame->colorspace);
         print_primaries(w, frame->color_primaries);
-
-        if (frame->color_trc != AVCOL_TRC_UNSPECIFIED)
-            print_str("color_transfer", av_color_transfer_name(frame->color_trc));
-        else
-            print_str_opt("color_transfer", av_color_transfer_name(frame->color_trc));
-
-        if (frame->chroma_location != AVCHROMA_LOC_UNSPECIFIED)
-            print_str("chroma_location", av_chroma_location_name(frame->chroma_location));
-        else
-            print_str_opt("chroma_location", av_chroma_location_name(frame->chroma_location));
+        print_color_trc(w, frame->color_trc);
+        print_chroma_location(w, frame->chroma_location);
         break;
 
     case AVMEDIA_TYPE_AUDIO:
@@ -2508,27 +2533,12 @@ static int show_stream(WriterContext *w, AVFormatContext *fmt_ctx, int stream_id
         if (s) print_str    ("pix_fmt", s);
         else   print_str_opt("pix_fmt", "unknown");
         print_int("level",   par->level);
-        if (par->color_range != AVCOL_RANGE_UNSPECIFIED)
-            print_str    ("color_range", av_color_range_name(par->color_range));
-        else
-            print_str_opt("color_range", "N/A");
-
-        if (par->color_space != AVCOL_SPC_UNSPECIFIED)
-            print_str("color_space", av_color_space_name(par->color_space));
-        else
-            print_str_opt("color_space", av_color_space_name(par->color_space));
-
-        if (par->color_trc != AVCOL_TRC_UNSPECIFIED)
-            print_str("color_transfer", av_color_transfer_name(par->color_trc));
-        else
-            print_str_opt("color_transfer", av_color_transfer_name(par->color_trc));
 
+        print_color_range(w, par->color_range, "N/A");
+        print_color_space(w, par->color_space);
+        print_color_trc(w, par->color_trc);
         print_primaries(w, par->color_primaries);
-
-        if (par->chroma_location != AVCHROMA_LOC_UNSPECIFIED)
-            print_str("chroma_location", av_chroma_location_name(par->chroma_location));
-        else
-            print_str_opt("chroma_location", av_chroma_location_name(par->chroma_location));
+        print_chroma_location(w, par->chroma_location);
 
         if (par->field_order == AV_FIELD_PROGRESSIVE)
             print_str("field_order", "progressive");