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authorThe Android Open Source Project <initial-contribution@android.com>2012-07-11 10:15:24 -0700
committerThe Android Open Source Project <initial-contribution@android.com>2012-07-11 10:15:24 -0700
commit2228e360595641dd906bf1773307f43d304f5b2e (patch)
tree57f3d390ebb0782cc0de0fb984c8ea7e45b4f386 /libAACdec/src/aacdec_hcr_bit.cpp
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Change-Id: If584e579464f28b97d50e51fc76ba654a5536c54
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+
+/* -----------------------------------------------------------------------------------------------------------
+Software License for The Fraunhofer FDK AAC Codec Library for Android
+
+© Copyright 1995 - 2012 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
+ All rights reserved.
+
+ 1. INTRODUCTION
+The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software that implements
+the MPEG Advanced Audio Coding ("AAC") encoding and decoding scheme for digital audio.
+This FDK AAC Codec software is intended to be used on a wide variety of Android devices.
+
+AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient general perceptual
+audio codecs. AAC-ELD is considered the best-performing full-bandwidth communications codec by
+independent studies and is widely deployed. AAC has been standardized by ISO and IEC as part
+of the MPEG specifications.
+
+Patent licenses for necessary patent claims for the FDK AAC Codec (including those of Fraunhofer)
+may be obtained through Via Licensing (www.vialicensing.com) or through the respective patent owners
+individually for the purpose of encoding or decoding bit streams in products that are compliant with
+the ISO/IEC MPEG audio standards. Please note that most manufacturers of Android devices already license
+these patent claims through Via Licensing or directly from the patent owners, and therefore FDK AAC Codec
+software may already be covered under those patent licenses when it is used for those licensed purposes only.
+
+Commercially-licensed AAC software libraries, including floating-point versions with enhanced sound quality,
+are also available from Fraunhofer. Users are encouraged to check the Fraunhofer website for additional
+applications information and documentation.
+
+2. COPYRIGHT LICENSE
+
+Redistribution and use in source and binary forms, with or without modification, are permitted without
+payment of copyright license fees provided that you satisfy the following conditions:
+
+You must retain the complete text of this software license in redistributions of the FDK AAC Codec or
+your modifications thereto in source code form.
+
+You must retain the complete text of this software license in the documentation and/or other materials
+provided with redistributions of the FDK AAC Codec or your modifications thereto in binary form.
+You must make available free of charge copies of the complete source code of the FDK AAC Codec and your
+modifications thereto to recipients of copies in binary form.
+
+The name of Fraunhofer may not be used to endorse or promote products derived from this library without
+prior written permission.
+
+You may not charge copyright license fees for anyone to use, copy or distribute the FDK AAC Codec
+software or your modifications thereto.
+
+Your modified versions of the FDK AAC Codec must carry prominent notices stating that you changed the software
+and the date of any change. For modified versions of the FDK AAC Codec, the term
+"Fraunhofer FDK AAC Codec Library for Android" must be replaced by the term
+"Third-Party Modified Version of the Fraunhofer FDK AAC Codec Library for Android."
+
+3. NO PATENT LICENSE
+
+NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without limitation the patents of Fraunhofer,
+ARE GRANTED BY THIS SOFTWARE LICENSE. Fraunhofer provides no warranty of patent non-infringement with
+respect to this software.
+
+You may use this FDK AAC Codec software or modifications thereto only for purposes that are authorized
+by appropriate patent licenses.
+
+4. DISCLAIMER
+
+This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright holders and contributors
+"AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, including but not limited to the implied warranties
+of merchantability and fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary, or consequential damages,
+including but not limited to procurement of substitute goods or services; loss of use, data, or profits,
+or business interruption, however caused and on any theory of liability, whether in contract, strict
+liability, or tort (including negligence), arising in any way out of the use of this software, even if
+advised of the possibility of such damage.
+
+5. CONTACT INFORMATION
+
+Fraunhofer Institute for Integrated Circuits IIS
+Attention: Audio and Multimedia Departments - FDK AAC LL
+Am Wolfsmantel 33
+91058 Erlangen, Germany
+
+www.iis.fraunhofer.de/amm
+amm-info@iis.fraunhofer.de
+----------------------------------------------------------------------------------------------------------- */
+
+/***************************** MPEG-4 AAC Decoder ***************************
+
+ Author(s): Robert Weidner (DSP Solutions)
+ Description: HCR Decoder: Bitstream reading
+
+*******************************************************************************/
+
+#include "aacdec_hcr_bit.h"
+
+
+/*---------------------------------------------------------------------------------------------
+ description: This function toggles the read direction.
+-----------------------------------------------------------------------------------------------
+ input: current read direction
+-----------------------------------------------------------------------------------------------
+ return: new read direction
+-------------------------------------------------------------------------------------------- */
+UCHAR ToggleReadDirection(UCHAR readDirection)
+{
+ if ( readDirection == FROM_LEFT_TO_RIGHT ) {
+ return FROM_RIGHT_TO_LEFT;
+ }
+ else {
+ return FROM_LEFT_TO_RIGHT;
+ }
+}
+
+
+/*---------------------------------------------------------------------------------------------
+ description: This function returns a bit from the bitstream according to read direction.
+ It is called very often, therefore it makes sense to inline it (runtime).
+-----------------------------------------------------------------------------------------------
+ input: - handle to FDK bitstream
+ - reference value marking start of bitfield
+ - pLeftStartOfSegment
+ - pRightStartOfSegment
+ - readDirection
+-----------------------------------------------------------------------------------------------
+ return: - bit from bitstream
+-------------------------------------------------------------------------------------------- */
+UINT HcrGetABitFromBitstream(HANDLE_FDK_BITSTREAM bs,
+ USHORT *pLeftStartOfSegment,
+ USHORT *pRightStartOfSegment,
+ UCHAR readDirection)
+{
+ UINT bit;
+ INT readBitOffset;
+
+ if (readDirection == FROM_LEFT_TO_RIGHT) {
+ readBitOffset = *pLeftStartOfSegment-FDKgetBitCnt(bs);
+ if( readBitOffset ) {
+ FDKpushBiDirectional(bs, readBitOffset);
+ }
+
+ bit = FDKreadBits(bs, 1);
+
+ *pLeftStartOfSegment += 1;
+ }
+ else {
+ readBitOffset = *pRightStartOfSegment-FDKgetBitCnt(bs);
+ if( readBitOffset ) {
+ FDKpushBiDirectional(bs, readBitOffset);
+ }
+
+ /* to be replaced with a brother function of FDKreadBits() */
+ bit = FDKreadBits(bs, 1);
+ FDKpushBack(bs, 2);
+
+ *pRightStartOfSegment -= 1;
+ }
+
+
+#if ERROR_GENERATOR_BIT_STREAM_HCR
+ static int a;
+ if ((++a % MODULO_DIVISOR_HCR) == 0) {
+ bit = (bit == 0) ? 1 : 0;
+ }
+#endif
+
+ return (bit);
+}
+