[FFmpeg-cvslog] hevc: Use switch instead of if-nests in decode_nal_sei_message

Luca Barbato git at videolan.org
Sun Aug 2 12:25:51 CEST 2015


ffmpeg | branch: master | Luca Barbato <lu_zero at gentoo.org> | Sat Jul 25 15:26:29 2015 +0200| [043f46f5741e1a5caedf55d788e1a72aae3b7605] | committer: Luca Barbato

hevc: Use switch instead of if-nests in decode_nal_sei_message

Makes simpler to add support for more SEI types.

Signed-off-by: Luca Barbato <lu_zero at gentoo.org>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=043f46f5741e1a5caedf55d788e1a72aae3b7605
---

 libavcodec/hevc_sei.c |   34 +++++++++++++++++++++-------------
 1 file changed, 21 insertions(+), 13 deletions(-)

diff --git a/libavcodec/hevc_sei.c b/libavcodec/hevc_sei.c
index c376da2..873899a 100644
--- a/libavcodec/hevc_sei.c
+++ b/libavcodec/hevc_sei.c
@@ -53,7 +53,7 @@ enum HEVC_SEI_TYPE {
     SEI_TYPE_CONTENT_LIGHT_LEVEL_INFO             = 144,
 };
 
-static void decode_nal_sei_decoded_picture_hash(HEVCContext *s)
+static int decode_nal_sei_decoded_picture_hash(HEVCContext *s)
 {
     int cIdx, i;
     GetBitContext *gb = &s->HEVClc.gb;
@@ -72,9 +72,10 @@ static void decode_nal_sei_decoded_picture_hash(HEVCContext *s)
             skip_bits(gb, 32);
         }
     }
+    return 0;
 }
 
-static void decode_nal_sei_frame_packing_arrangement(HEVCContext *s)
+static int decode_nal_sei_frame_packing_arrangement(HEVCContext *s)
 {
     GetBitContext *gb = &s->HEVClc.gb;
 
@@ -97,9 +98,10 @@ static void decode_nal_sei_frame_packing_arrangement(HEVCContext *s)
         skip_bits1(gb);         // frame_packing_arrangement_persistance_flag
     }
     skip_bits1(gb);             // upsampled_aspect_ratio_flag
+    return 0;
 }
 
-static void decode_nal_sei_display_orientation(HEVCContext *s)
+static int decode_nal_sei_display_orientation(HEVCContext *s)
 {
     GetBitContext *gb = &s->HEVClc.gb;
 
@@ -112,6 +114,8 @@ static void decode_nal_sei_display_orientation(HEVCContext *s)
         s->sei_anticlockwise_rotation = get_bits(gb, 16);
         skip_bits1(gb);     // display_orientation_persistence_flag
     }
+
+    return 0;
 }
 
 static int decode_nal_sei_message(HEVCContext *s)
@@ -133,22 +137,26 @@ static int decode_nal_sei_message(HEVCContext *s)
         payload_size += byte;
     }
     if (s->nal_unit_type == NAL_SEI_PREFIX) {
-        if (payload_type == 256) // Mismatched value from HM 8.1
-            decode_nal_sei_decoded_picture_hash(s);
-        else if (payload_type == SEI_TYPE_FRAME_PACKING)
-            decode_nal_sei_frame_packing_arrangement(s);
-        else if (payload_type == SEI_TYPE_DISPLAY_ORIENTATION)
-            decode_nal_sei_display_orientation(s);
-        else {
+        switch (payload_type) {
+        case 256:  // Mismatched value from HM 8.1
+            return decode_nal_sei_decoded_picture_hash(s);
+        case SEI_TYPE_FRAME_PACKING:
+            return decode_nal_sei_frame_packing_arrangement(s);
+        case SEI_TYPE_DISPLAY_ORIENTATION:
+            return decode_nal_sei_display_orientation(s);
+        default:
             av_log(s->avctx, AV_LOG_DEBUG, "Skipped PREFIX SEI %d\n", payload_type);
             skip_bits(gb, 8 * payload_size);
+            return 0;
         }
     } else { /* nal_unit_type == NAL_SEI_SUFFIX */
-        if (payload_type == SEI_TYPE_DECODED_PICTURE_HASH)
-            decode_nal_sei_decoded_picture_hash(s);
-        else {
+        switch (payload_type) {
+        case SEI_TYPE_DECODED_PICTURE_HASH:
+            return decode_nal_sei_decoded_picture_hash(s);
+        default:
             av_log(s->avctx, AV_LOG_DEBUG, "Skipped SUFFIX SEI %d\n", payload_type);
             skip_bits(gb, 8 * payload_size);
+            return 0;
         }
     }
     return 0;



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