[FFmpeg-cvslog] h264_parser: fully parse first_mb_in_slice to more reliably detect AU boundaries.

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michaelni at gmx.at> | Thu Oct 27 17:53:29 2011 +0200| [4ffed61b4938d9a3371ca9d4af0be578546a4ae0] | committer: Michael Niedermayer

h264_parser: fully parse first_mb_in_slice to more reliably detect AU boundaries.

Signed-off-by: Michael Niedermayer <michaelni at gmx.at>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=4ffed61b4938d9a3371ca9d4af0be578546a4ae0
---

 libavcodec/h264.h        |    4 ++++
 libavcodec/h264_parser.c |   27 +++++++++++++++++++--------
 2 files changed, 23 insertions(+), 8 deletions(-)

diff --git a/libavcodec/h264.h b/libavcodec/h264.h
index f4a4633..63ed357 100644
--- a/libavcodec/h264.h
+++ b/libavcodec/h264.h
@@ -591,6 +591,10 @@ typedef struct H264Context{
     int16_t slice_row[MAX_SLICES]; ///< to detect when MAX_SLICES is too low
 
     int sync;                      ///< did we had a keyframe or recovery point
+
+    uint8_t parse_history[4];
+    int parse_history_count;
+    int parse_last_mb;
 }H264Context;
 
 
diff --git a/libavcodec/h264_parser.c b/libavcodec/h264_parser.c
index 778ef1e..4945a68 100644
--- a/libavcodec/h264_parser.c
+++ b/libavcodec/h264_parser.c
@@ -93,17 +93,28 @@ static int ff_h264_find_frame_end(H264Context *h, const uint8_t *buf, int buf_si
                     goto found;
                 }
             }else if(v==1 || v==2 || v==5){
+                state+=8;
+                continue;
+            }
+            state= 7;
+        }else{
+            h->parse_history[h->parse_history_count++]= buf[i];
+            if(h->parse_history_count>3){
+                unsigned int mb, last_mb= h->parse_last_mb;
+                GetBitContext gb;
+
+                init_get_bits(&gb, h->parse_history, 8*h->parse_history_count);
+                h->parse_history_count=0;
+                mb= get_ue_golomb_long(&gb);
+                last_mb= h->parse_last_mb;
+                h->parse_last_mb= mb;
                 if(pc->frame_start_found){
-                    state+=8;
-                    continue;
+                    if(mb <= last_mb)
+                        goto found;
                 }else
                     pc->frame_start_found = 1;
+                state= 7;
             }
-            state= 7;
-        }else{
-            if(buf[i] & 0x80)
-                goto found;
-            state= 7;
         }
     }
     pc->state= state;
@@ -116,7 +127,7 @@ found:
     pc->frame_start_found= 0;
     if(h->is_avc)
         return next_avc;
-    return i-(state&5);
+    return i-(state&5) - 3*(state>7);
 }
 
 /**