Initial check in of stagefright software AAC decoder based on PV source code.

1 files changed, 215 insertions, 0 deletions

diff --git a/media/libstagefright/codecs/aacdec/get_dse.cpp b/media/libstagefright/codecs/aacdec/get_dse.cpp
new file mode 100644
index 0000000..d64087f
--- /dev/null
+++ b/media/libstagefright/codecs/aacdec/get_dse.cpp
@@ -0,0 +1,215 @@
+/* ------------------------------------------------------------------
+ * 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:
+    pInputStream = pointer to a BITS structure that holds information
+                   regarding the input stream.
+
+ Local Stores/Buffers/Pointers Needed:
+    None
+
+ Global Stores/Buffers/Pointers Needed:
+    None
+
+ Outputs:
+    None
+
+ Pointers and Buffers Modified:
+    pInputStream->usedBits is rounded up to a number that represents the next
+    byte boundary.
+
+ Local Stores Modified:
+    None
+
+ Global Stores Modified:
+    None
+
+------------------------------------------------------------------------------
+ FUNCTION DESCRIPTION
+
+    Adquire Data Stream element (DSE) from raw bitstream
+    At this time this function just drops the information.
+
+------------------------------------------------------------------------------
+ REQUIREMENTS
+
+  This function shall not use global or static variables.
+
+------------------------------------------------------------------------------
+ REFERENCES
+
+ (1) MPEG-2 NBC Audio Decoder
+   "This software module was originally developed by AT&T, Dolby
+   Laboratories, Fraunhofer Gesellschaft IIS in the course of development
+   of the MPEG-2 NBC/MPEG-4 Audio standard ISO/IEC 13818-7, 14496-1,2 and
+   3. This software module is an implementation of a part of one or more
+   MPEG-2 NBC/MPEG-4 Audio tools as specified by the MPEG-2 NBC/MPEG-4
+   Audio standard. ISO/IEC gives users of the MPEG-2 NBC/MPEG-4 Audio
+   standards free license to this software module or modifications thereof
+   for use in hardware or software products claiming conformance to the
+   MPEG-2 NBC/MPEG-4 Audio  standards. Those intending to use this software
+   module in hardware or software products are advised that this use may
+   infringe existing patents. The original developer of this software
+   module and his/her company, the subsequent editors and their companies,
+   and ISO/IEC have no liability for use of this software module or
+   modifications thereof in an implementation. Copyright is not released
+   for non MPEG-2 NBC/MPEG-4 Audio conforming products.The original
+   developer retains full right to use the code for his/her own purpose,
+   assign or donate the code to a third party and to inhibit third party
+   from using the code for non MPEG-2 NBC/MPEG-4 Audio conforming products.
+   This copyright notice must be included in all copies or derivative
+   works."
+   Copyright(c)1996.
+
+------------------------------------------------------------------------------
+ PSEUDO-CODE
+
+void byte_align(
+    BITS  *pInputStream)
+
+    MODIFYING(pInputStream->usedBits = pInputStream->usedBits +
+                (pInputStream->usedBits + 7) % 8)
+
+    RETURN(nothing)
+
+------------------------------------------------------------------------------
+ RESOURCES USED
+
+ STACK USAGE:
+
+     where:
+
+ DATA MEMORY USED: x words
+
+ PROGRAM MEMORY USED: x words
+
+ CLOCK CYCLES:
+
+------------------------------------------------------------------------------
+*/
+
+
+/*----------------------------------------------------------------------------
+; INCLUDES
+----------------------------------------------------------------------------*/
+
+#include "pv_audio_type_defs.h"
+#include "get_dse.h"
+#include "ibstream.h"
+#include "getbits.h"
+#include "s_bits.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 VARIABLE DEFINITIONS
+; Variable declaration - defined here and used outside this module
+----------------------------------------------------------------------------*/
+
+/*----------------------------------------------------------------------------
+; EXTERNAL FUNCTION REFERENCES
+; Declare functions defined elsewhere and referenced in this module
+----------------------------------------------------------------------------*/
+
+/*----------------------------------------------------------------------------
+; EXTERNAL VARIABLES REFERENCES
+; Declare variables used in this module but defined elsewhere
+----------------------------------------------------------------------------*/
+
+/*----------------------------------------------------------------------------
+; FUNCTION CODE
+----------------------------------------------------------------------------*/
+
+void get_dse(
+    Char    *DataStreamBytes,
+    BITS    *pInputStream)
+{
+    Int i;
+    Int data_byte_align_flag;
+    UInt count;
+    Int esc_count;
+    Char    *pDataStreamBytes;
+
+    pDataStreamBytes = DataStreamBytes;
+
+    /*
+     *  Get element instance tag  ( 4 bits)
+     *  ( max of 16 per raw data block)
+     */
+    get9_n_lessbits(LEN_TAG, pInputStream);
+
+    /*
+     *  get data_byte_align_flag ( 1 bit0 to see if byte alignment is
+     *  performed within the DSE
+     */
+    data_byte_align_flag = get1bits(pInputStream);
+
+    /*
+     *  get count ( 8 bits)
+     */
+    count =  get9_n_lessbits(LEN_D_CNT, pInputStream);
+
+    /*
+     *  if count == 255, its value it is incremented  by a
+     *  second 8 bit value, esc_count. This final value represents
+     *  the number of bytes in the DSE
+     */
+    if (count == (1 << LEN_D_CNT) - 1)
+    {
+        esc_count = (Int)get9_n_lessbits(LEN_D_ESC, pInputStream);  /* 8 bits */
+        count +=  esc_count;
+    }
+
+    /*
+     *  Align if flag is set
+     */
+    if (data_byte_align_flag)
+    {
+        byte_align(pInputStream);
+    }
+
+    for (i = count; i != 0; i--)
+    {
+        *(pDataStreamBytes++) = (Char) get9_n_lessbits(
+                                    LEN_BYTE,
+                                    pInputStream);
+    }
+
+    return;
+
+} /* end get_dse */
+