[vlc-commits] codec: cc: comment implicit code path

[Francois Cartegnie]

vlc | branch: master | Francois Cartegnie <fcvlcdev at free.fr> | Fri Sep 23 14:24:44 2016 +0200| [86059cad3a5bd83438a1551d7de55bd5edf45148] | committer: Francois Cartegnie

codec: cc: comment implicit code path

> http://git.videolan.org/gitweb.cgi/vlc.git/?a=commit;h=86059cad3a5bd83438a1551d7de55bd5edf45148
---

 modules/codec/cc.h | 20 +++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)

diff --git a/modules/codec/cc.h b/modules/codec/cc.h
index 6834a00..24d746b 100644
--- a/modules/codec/cc.h
+++ b/modules/codec/cc.h
@@ -104,8 +104,8 @@ static inline void cc_Extract( cc_data_t *c, bool b_top_field_first, const uint8
     static const uint8_t p_cc_replaytv4b[2] = { 0xcc, 0x02 };
     static const uint8_t p_cc_replaytv5a[2] = { 0x99, 0x02 };
     static const uint8_t p_cc_replaytv5b[2] = { 0xaa, 0x02 };
-    static const uint8_t p_cc_scte20[2] = { 0x03, 0x81 };
-    static const uint8_t p_cc_scte20_old[2] = { 0x03, 0x01 };
+    static const uint8_t p_cc_scte20[2] = { 0x03, 0x81 };    /* user_data_type_code, SCTE 20 */
+    static const uint8_t p_cc_scte20_old[2] = { 0x03, 0x01 };/* user_data_type_code, old, Note 1 */
 
     if( i_src < 4 )
         return;
@@ -270,8 +270,22 @@ static inline void cc_Extract( cc_data_t *c, bool b_top_field_first, const uint8
         }
         c->b_reorder = false;
     }
-    else
+    else /* CC_PAYLOAD_SCTE20 */
     {
+        /* user_data(2)
+         *          (u32 stripped earlier)
+         *          u16 p_cc_scte20
+         *          u5 cc_count
+         *          for cc_count
+         *              u2 cc_priority
+         *              u2 cc_field_num
+         *              u5 cc_line_offset
+         *              u8 cc_data_1[1:8]
+         *              u8 cc_data_2[1:8]
+         *              u1 marker bit
+         *          un additional_realtimevideodata
+         *          un reserved
+         */
         bs_t s;
         bs_init( &s, &p_src[2], i_src - 2 );
         const int i_cc_count = bs_read( &s, 5 );