From 3178f4d33ff62243f7cdddb081db516ea34396c9 Mon Sep 17 00:00:00 2001
From: Anton Khirnov <anton@khirnov.net>
Date: Sat, 17 Jan 2015 22:28:46 +0100
Subject: [PATCH] h264: move rbsp_buffer into the per-slice context

---
 libavcodec/h264.c        | 22 +++++++++++-----------
 libavcodec/h264.h        |  8 +++++---
 libavcodec/h264_parser.c |  2 +-
 libavcodec/h264_slice.c  |  3 ---
 4 files changed, 17 insertions(+), 18 deletions(-)

diff --git a/libavcodec/h264.c b/libavcodec/h264.c
index df9d26fe44..8d213d765b 100644
--- a/libavcodec/h264.c
+++ b/libavcodec/h264.c
@@ -216,7 +216,8 @@ int ff_h264_check_intra_pred_mode(const H264Context *h, H264SliceContext *sl,
     return mode;
 }
 
-const uint8_t *ff_h264_decode_nal(H264Context *h, const uint8_t *src,
+const uint8_t *ff_h264_decode_nal(H264Context *h, H264SliceContext *sl,
+                                  const uint8_t *src,
                                   int *dst_length, int *consumed, int length)
 {
     int i, si, di;
@@ -282,9 +283,9 @@ const uint8_t *ff_h264_decode_nal(H264Context *h, const uint8_t *src,
         return src;
     }
 
-    av_fast_malloc(&h->rbsp_buffer, &h->rbsp_buffer_size,
+    av_fast_malloc(&sl->rbsp_buffer, &sl->rbsp_buffer_size,
                    length + FF_INPUT_BUFFER_PADDING_SIZE);
-    dst = h->rbsp_buffer;
+    dst = sl->rbsp_buffer;
 
     if (!dst)
         return NULL;
@@ -380,10 +381,6 @@ void ff_h264_free_tables(H264Context *h, int free_rbsp)
         if (!hx)
             continue;
 
-        if (free_rbsp) {
-            av_freep(&hx->rbsp_buffer);
-            hx->rbsp_buffer_size = 0;
-        }
         if (i)
             av_freep(&h->thread_context[i]);
     }
@@ -405,6 +402,11 @@ void ff_h264_free_tables(H264Context *h, int free_rbsp)
         sl->edge_emu_buffer_allocated   = 0;
         sl->top_borders_allocated[0]    = 0;
         sl->top_borders_allocated[1]    = 0;
+
+        if (free_rbsp) {
+            av_freep(&sl->rbsp_buffer);
+            sl->rbsp_buffer_size            = 0;
+        }
     }
 }
 
@@ -709,8 +711,6 @@ static int decode_init_thread_copy(AVCodecContext *avctx)
         h->slice_ctx[i].h264 = h;
 
     h->avctx               = avctx;
-    h->rbsp_buffer         = NULL;
-    h->rbsp_buffer_size    = 0;
     h->context_initialized = 0;
 
     return 0;
@@ -1385,7 +1385,7 @@ static int get_last_needed_nal(H264Context *h, const uint8_t *buf, int buf_size)
                 break;
         }
 
-        ptr = ff_h264_decode_nal(h, buf + buf_index, &dst_length, &consumed,
+        ptr = ff_h264_decode_nal(h, &h->slice_ctx[0], buf + buf_index, &dst_length, &consumed,
                                  next_avc - buf_index);
 
         if (!ptr || dst_length < 0)
@@ -1471,7 +1471,7 @@ static int decode_nal_units(H264Context *h, const uint8_t *buf, int buf_size,
             hx = h->thread_context[context_count];
             sl = &h->slice_ctx[context_count];
 
-            ptr = ff_h264_decode_nal(hx, buf + buf_index, &dst_length,
+            ptr = ff_h264_decode_nal(hx, sl, buf + buf_index, &dst_length,
                                      &consumed, next_avc - buf_index);
             if (!ptr || dst_length < 0) {
                 ret = -1;
diff --git a/libavcodec/h264.h b/libavcodec/h264.h
index 5915211a48..594c65db8f 100644
--- a/libavcodec/h264.h
+++ b/libavcodec/h264.h
@@ -439,6 +439,10 @@ typedef struct H264SliceContext {
     CABACContext cabac;
     uint8_t cabac_state[1024];
     int cabac_init_idc;
+
+    // rbsp buffer used for this slice
+    uint8_t *rbsp_buffer;
+    unsigned int rbsp_buffer_size;
 } H264SliceContext;
 
 /**
@@ -542,8 +546,6 @@ typedef struct H264Context {
 
     int nal_ref_idc;
     int nal_unit_type;
-    uint8_t *rbsp_buffer;
-    unsigned int rbsp_buffer_size;
 
     /**
      * Used to parse AVC variant of h264
@@ -757,7 +759,7 @@ int ff_h264_decode_picture_parameter_set(H264Context *h, int bit_length);
  *                   or a decode rbsp tailing?
  * @return decoded bytes, might be src+1 if no escapes
  */
-const uint8_t *ff_h264_decode_nal(H264Context *h, const uint8_t *src,
+const uint8_t *ff_h264_decode_nal(H264Context *h, H264SliceContext *sl, const uint8_t *src,
                                   int *dst_length, int *consumed, int length);
 
 /**
diff --git a/libavcodec/h264_parser.c b/libavcodec/h264_parser.c
index e6528060f7..d04eeb1974 100644
--- a/libavcodec/h264_parser.c
+++ b/libavcodec/h264_parser.c
@@ -226,7 +226,7 @@ static inline int parse_nal_units(AVCodecParserContext *s,
             }
             break;
         }
-        ptr = ff_h264_decode_nal(h, buf, &dst_length, &consumed, src_length);
+        ptr = ff_h264_decode_nal(h, sl, buf, &dst_length, &consumed, src_length);
         if (!ptr || dst_length < 0)
             break;
 
diff --git a/libavcodec/h264_slice.c b/libavcodec/h264_slice.c
index aef9c5080e..c482877930 100644
--- a/libavcodec/h264_slice.c
+++ b/libavcodec/h264_slice.c
@@ -535,9 +535,6 @@ int ff_h264_update_thread_context(AVCodecContext *dst,
             return ret;
         }
 
-        h->rbsp_buffer      = NULL;
-        h->rbsp_buffer_size = 0;
-
         h->thread_context[0] = h;
 
         h->context_initialized = 1;