1 files changed, 176 insertions, 0 deletions
diff --git a/media/libstagefright/codecs/m4v_h263/dec/src/find_min_max.cpp b/media/libstagefright/codecs/m4v_h263/dec/src/find_min_max.cpp
new file mode 100644
index 0000000..a357ea6
--- /dev/null
+++ b/media/libstagefright/codecs/m4v_h263/dec/src/find_min_max.cpp
@@ -0,0 +1,176 @@
+/* ------------------------------------------------------------------
+ * Copyright (C) 1998-2009 PacketVideo
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
+ * express or implied.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ * -------------------------------------------------------------------
+ */
+/*
+------------------------------------------------------------------------------
+ INPUT AND OUTPUT DEFINITIONS
+
+ Inputs:
+    input_ptr = pointer to the buffer containing values of type UChar
+            in a 2D block of data.
+    min_ptr = pointer to the minimum value of type Int to be found in a
+          square block of size BLKSIZE contained in 2D block of data.
+    max_ptr = pointer to the maximum value of type Int to be found in a
+          square block of size BLKSIZE contained in 2D block of data.
+    incr = value of type Int representing the width of 2D block of data.
+
+ Local Stores/Buffers/Pointers Needed:
+    None
+
+ Global Stores/Buffers/Pointers Needed:
+    None
+
+ Outputs:
+    None
+
+ Pointers and Buffers Modified:
+    min_ptr points to the found minimum value in the square block of
+    size BLKSIZE contained in 2D block of data.
+
+    max_ptr points to the found maximum value in the square block of
+    size BLKSIZE contained in 2D block of data.
+
+ Local Stores Modified:
+    None
+
+ Global Stores Modified:
+    None
+
+------------------------------------------------------------------------------
+ FUNCTION DESCRIPTION
+
+ This function finds the maximum and the minimum values in a square block of
+ data of size BLKSIZE * BLKSIZE. The data is contained in the buffer which
+ represents a 2D block of data that is larger than BLKSIZE * BLKSIZE.
+ This is illustrated below.
+
+    mem loc x + 00h -> o o o o o o o o o o o o o o o o
+    mem loc x + 10h -> o o o o o X X X X X X X X o o o
+    mem loc x + 20h -> o o o o o X X X X X X X X o o o
+    mem loc x + 30h -> o o o o o X X X X X X X X o o o
+    mem loc x + 40h -> o o o o o X X X X X X X X o o o
+    mem loc x + 50h -> o o o o o X X X X X X X X o o o
+    mem loc x + 60h -> o o o o o X X X X X X X X o o o
+    mem loc x + 70h -> o o o o o X X X X X X X X o o o
+    mem loc x + 80h -> o o o o o X X X X X X X X o o o
+    mem loc x + 90h -> o o o o o o o o o o o o o o o o
+    mem loc x + A0h -> o o o o o o o o o o o o o o o o
+    mem loc x + B0h -> o o o o o o o o o o o o o o o o
+
+For illustration purposes, the diagram assumes that BLKSIZE is equal to 8
+but this is not a requirement. In this diagram, the buffer starts at
+location x but the input pointer, input_ptr, passed into this function
+would be the first row of data to be searched which is at x + 15h. The
+value of incr passed onto this function represents the amount the input_ptr
+needs to be incremented to point to the next row of data.
+
+This function compares each value in a row to the current maximum and
+minimum. After each row, input_ptr is incremented to point to the next row.
+This is repeated until all rows have been processed. When the search is
+complete the location pointed to by min_ptr contains the minimum value
+found and the location pointed to by max_ptr contains the maximum value found.
+
+------------------------------------------------------------------------------
+*/
+
+
+/*----------------------------------------------------------------------------
+; INCLUDES
+----------------------------------------------------------------------------*/
+#include    "mp4dec_lib.h"
+#include    "post_proc.h"
+
+/*----------------------------------------------------------------------------
+; MACROS
+; Define module specific macros here
+----------------------------------------------------------------------------*/
+
+/*----------------------------------------------------------------------------
+; DEFINES
+; Include all pre-processor statements here. Include conditional
+; compile variables also.
+----------------------------------------------------------------------------*/
+
+/*----------------------------------------------------------------------------
+; LOCAL FUNCTION DEFINITIONS
+; Function Prototype declaration
+----------------------------------------------------------------------------*/
+
+/*----------------------------------------------------------------------------
+; LOCAL STORE/BUFFER/POINTER DEFINITIONS
+; Variable declaration - defined here and used outside this module
+----------------------------------------------------------------------------*/
+
+/*----------------------------------------------------------------------------
+; EXTERNAL FUNCTION REFERENCES
+; Declare functions defined elsewhere and referenced in this module
+----------------------------------------------------------------------------*/
+
+/*----------------------------------------------------------------------------
+; EXTERNAL GLOBAL STORE/BUFFER/POINTER REFERENCES
+; Declare variables used in this module but defined elsewhere
+----------------------------------------------------------------------------*/
+
+#ifdef PV_POSTPROC_ON
+/*----------------------------------------------------------------------------
+; FUNCTION CODE
+----------------------------------------------------------------------------*/
+void  FindMaxMin(
+    uint8 *input_ptr,
+    int *min_ptr,
+    int *max_ptr,
+    int incr)
+{
+    /*----------------------------------------------------------------------------
+    ; Define all local variables
+    ----------------------------------------------------------------------------*/
+    register    uint    i, j;
+    register    int min, max;
+
+    /*----------------------------------------------------------------------------
+    ; Function body here
+    ----------------------------------------------------------------------------*/
+    max = min = *input_ptr;
+    /*  incr = incr - BLKSIZE; */   /*  09/06/2001, already passed in as width - BLKSIZE */
+
+    for (i = BLKSIZE; i > 0; i--)
+    {
+        for (j = BLKSIZE; j > 0; j--)
+        {
+            if (*input_ptr > max)
+            {
+                max = *input_ptr;
+            }
+            else if (*input_ptr < min)
+            {
+                min = *input_ptr;
+            }
+            input_ptr += 1;
+        }
+
+        /* set pointer to the beginning of the next row*/
+        input_ptr += incr;
+    }
+
+    *max_ptr = max;
+    *min_ptr = min;
+    /*----------------------------------------------------------------------------
+    ; Return nothing or data or data pointer
+    ----------------------------------------------------------------------------*/
+    return;
+}
+#endif