summaryrefslogtreecommitdiffstats
path: root/media/libstagefright/codecs/aacdec/deinterleave.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'media/libstagefright/codecs/aacdec/deinterleave.cpp')
-rw-r--r--media/libstagefright/codecs/aacdec/deinterleave.cpp287
1 files changed, 287 insertions, 0 deletions
diff --git a/media/libstagefright/codecs/aacdec/deinterleave.cpp b/media/libstagefright/codecs/aacdec/deinterleave.cpp
new file mode 100644
index 0000000..5298b19
--- /dev/null
+++ b/media/libstagefright/codecs/aacdec/deinterleave.cpp
@@ -0,0 +1,287 @@
+/* ------------------------------------------------------------------
+ * 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.
+ * -------------------------------------------------------------------
+ */
+/*
+
+ Pathname: ./src/deinterleave.c
+
+------------------------------------------------------------------------------
+ REVISION HISTORY
+
+ Description: Modified from original shareware code
+
+ Description: (1) Modified with new template, rename variables
+ (2) Removed for-loop to calculate win_inc, win_inc = SN2 (128)
+ (3) Replaced for-loop with memcpy
+ (4) Converted Int16 -> Int
+
+ Description: Modified per review comments
+
+ Who: Date:
+ Description:
+
+------------------------------------------------------------------------------
+ INPUT AND OUTPUT DEFINITIONS
+
+ Inputs:
+ interleaved = input array that contains interleaved coefficients
+ Data Type Int
+
+ deinterleaved = output array that will be updated with de-interleaved
+ coefficients of input array. Data Type Int
+
+ pFrameInfo = pointer to structure that holds information of current
+ frame. Data Type FrameInfo
+
+ Local Stores/Buffers/Pointers Needed:
+ None
+
+ Global Stores/Buffers/Pointers Needed:
+ None
+
+ Outputs:
+ None
+
+ Pointers and Buffers Modified:
+ deinterleaved contents updated with de-interleaved coefficients from
+ the input array: interleaved
+
+ Local Stores Modified:
+ None
+
+ Global Stores Modified:
+ None
+
+------------------------------------------------------------------------------
+ FUNCTION DESCRIPTION
+
+ This function performs the deinterleaving across all short windows in
+ each group
+
+------------------------------------------------------------------------------
+ REQUIREMENTS
+
+ This function should replace the contents of pDeinterleaved with the
+ de-interleaved 1024 coefficients of one frame
+
+------------------------------------------------------------------------------
+ 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.
+
+ (2) ISO/IEC 14496-3: 1999(E)
+ Subpart 4 p78 quant_to_spec
+
+------------------------------------------------------------------------------
+ PSEUDO-CODE
+
+ pInterleaved = interleaved;
+ pDeinterleaved = deinterleaved;
+
+ pSfbPerWin = pFrameInfo->sfb_per_win;
+ ngroups = pFrameInfo->num_groups;
+ pGroupLen = pFrameInfo->group_len;
+
+ pGroup = pDeinterleaved;
+
+ FOR (group = ngroups; group > 0; group--)
+
+ pSfbWidth = pFrameInfo->sfb_width_128;
+ sfb_inc = 0;
+ pStart = pInterleaved;
+
+ FOR (sfb = pSfbPerWin[ngroups-group]; sfb > 0; sfb--)
+
+ pWin = pGroup;
+
+ FOR (win = pGroupLen[ngroups-group]; win > 0; win--)
+
+ pDeinterleaved = pWin + sfb_inc;
+
+ pv_memcpy(
+ pDeinterleaved,
+ pInterleaved,
+ *pSfbWidth*sizeof(*pInterleaved));
+
+ pInterleaved += *pSfbWidth;
+
+ pWin += SN2;
+
+ ENDFOR (win)
+
+ sfb_inc += *pSfbWidth++;
+
+ ENDFOR (sfb)
+
+ pGroup += (pInterleaved - pStart);
+
+ ENDFOR (group)
+
+------------------------------------------------------------------------------
+ RESOURCES USED
+ When the code is written for a specific target processor the
+ the resources used should be documented below.
+
+ STACK USAGE: [stack count for this module] + [variable to represent
+ stack usage for each subroutine called]
+
+ where: [stack usage variable] = stack usage for [subroutine
+ name] (see [filename].ext)
+
+ DATA MEMORY USED: x words
+
+ PROGRAM MEMORY USED: x words
+
+ CLOCK CYCLES: [cycle count equation for this module] + [variable
+ used to represent cycle count for each subroutine
+ called]
+
+ where: [cycle count variable] = cycle count for [subroutine
+ name] (see [filename].ext)
+
+------------------------------------------------------------------------------
+*/
+
+
+/*----------------------------------------------------------------------------
+; INCLUDES
+----------------------------------------------------------------------------*/
+#include "pv_audio_type_defs.h"
+#include "huffman.h"
+#include "aac_mem_funcs.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
+----------------------------------------------------------------------------*/
+
+/*----------------------------------------------------------------------------
+; FUNCTION CODE
+----------------------------------------------------------------------------*/
+void deinterleave(
+ Int16 interleaved[],
+ Int16 deinterleaved[],
+ FrameInfo *pFrameInfo)
+{
+
+ Int group; /* group index */
+ Int sfb; /* scalefactor band index */
+ Int win; /* window index */
+ Int16 *pGroup;
+ Int16 *pWin;
+ Int16 *pStart;
+ Int16 *pInterleaved;
+ Int16 *pDeinterleaved;
+ Int sfb_inc;
+
+ Int ngroups;
+ Int *pGroupLen;
+ Int *pSfbPerWin;
+ Int *pSfbWidth;
+
+ pInterleaved = interleaved;
+ pDeinterleaved = deinterleaved;
+
+ pSfbPerWin = pFrameInfo->sfb_per_win;
+ ngroups = pFrameInfo->num_groups;
+ pGroupLen = pFrameInfo->group_len;
+
+ pGroup = pDeinterleaved;
+
+ for (group = ngroups; group > 0; group--)
+ {
+ pSfbWidth = pFrameInfo->sfb_width_128;
+ sfb_inc = 0;
+ pStart = pInterleaved;
+
+ /* Perform the deinterleaving across all windows in a group */
+
+ for (sfb = pSfbPerWin[ngroups-group]; sfb > 0; sfb--)
+ {
+ pWin = pGroup;
+
+ for (win = pGroupLen[ngroups-group]; win > 0; win--)
+ {
+ pDeinterleaved = pWin + sfb_inc;
+
+ pv_memcpy(
+ pDeinterleaved,
+ pInterleaved,
+ *pSfbWidth*sizeof(*pInterleaved));
+
+ pInterleaved += *pSfbWidth;
+
+ pWin += SN2;
+
+ } /* for (win) */
+
+ sfb_inc += *pSfbWidth++;
+
+ } /* for (sfb) */
+
+ pGroup += (pInterleaved - pStart);
+
+ } /* for (group) */
+
+} /* deinterleave */
generated by cgit v1.1 at 2024-05-29 16:01:11 +0000