From 4e2b9bcc085586e9e0502e5fad2447ea671697ec Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michaelni@gmx.at>
Date: Sat, 4 Aug 2007 11:01:11 +0000
Subject: [PATCH] Make MPEG-1/2 decoder work with the libmpeg2-style bitstream
 reader.

Originally committed as revision 9890 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libavcodec/mpeg12.c | 33 ++++++++++++++++++++++++++++++++-
 1 file changed, 32 insertions(+), 1 deletion(-)

diff --git a/libavcodec/mpeg12.c b/libavcodec/mpeg12.c
index e62827a416..89793a5794 100644
--- a/libavcodec/mpeg12.c
+++ b/libavcodec/mpeg12.c
@@ -737,7 +737,9 @@ static inline int mpeg1_decode_block_inter(MpegEncContext *s,
             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
                 goto end;
         }
-
+#if MIN_CACHE_BITS < 19
+        UPDATE_CACHE(re, &s->gb);
+#endif
         /* now quantify & encode AC coefs */
         for(;;) {
             GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0);
@@ -777,9 +779,14 @@ static inline int mpeg1_decode_block_inter(MpegEncContext *s,
             }
 
             block[j] = level;
+#if MIN_CACHE_BITS < 19
+            UPDATE_CACHE(re, &s->gb);
+#endif
             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
                 break;
+#if MIN_CACHE_BITS >= 19
             UPDATE_CACHE(re, &s->gb);
+#endif
         }
 end:
         LAST_SKIP_BITS(re, &s->gb, 2);
@@ -812,6 +819,9 @@ static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *bloc
             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
                 goto end;
         }
+#if MIN_CACHE_BITS < 19
+        UPDATE_CACHE(re, &s->gb);
+#endif
 
         /* now quantify & encode AC coefs */
         for(;;) {
@@ -848,9 +858,14 @@ static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *bloc
             }
 
             block[j] = level;
+#if MIN_CACHE_BITS < 19
+            UPDATE_CACHE(re, &s->gb);
+#endif
             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
                 break;
+#if MIN_CACHE_BITS >= 19
             UPDATE_CACHE(re, &s->gb);
+#endif
         }
 end:
         LAST_SKIP_BITS(re, &s->gb, 2);
@@ -895,6 +910,9 @@ static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
                 goto end;
         }
+#if MIN_CACHE_BITS < 19
+        UPDATE_CACHE(re, &s->gb);
+#endif
 
         /* now quantify & encode AC coefs */
         for(;;) {
@@ -928,9 +946,14 @@ static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
 
             mismatch ^= level;
             block[j] = level;
+#if MIN_CACHE_BITS < 19
+            UPDATE_CACHE(re, &s->gb);
+#endif
             if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
                 break;
+#if MIN_CACHE_BITS >= 19
             UPDATE_CACHE(re, &s->gb);
+#endif
         }
 end:
         LAST_SKIP_BITS(re, &s->gb, 2);
@@ -965,6 +988,9 @@ static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
         if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
             goto end;
     }
+#if MIN_CACHE_BITS < 19
+    UPDATE_CACHE(re, &s->gb);
+#endif
 
     /* now quantify & encode AC coefs */
     for(;;) {
@@ -993,9 +1019,14 @@ static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
         }
 
         block[j] = level;
+#if MIN_CACHE_BITS < 19
+        UPDATE_CACHE(re, &s->gb);
+#endif
         if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF)
             break;
+#if MIN_CACHE_BITS >=19
         UPDATE_CACHE(re, &s->gb);
+#endif
     }
 end:
     LAST_SKIP_BITS(re, &s->gb, 2);