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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 /libMpegTPDec/src/tpdec_adts.cpp
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Snapshot 2bda038c163298531d47394bc2c09e1409c5d0db
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): Josef Hoepfl
+ Description: ADTS interface
+
+******************************************************************************/
+
+#include "tpdec_adts.h"
+
+
+#include "FDK_bitstream.h"
+
+
+
+void adtsRead_CrcInit(HANDLE_ADTS pAdts) /*!< pointer to adts crc info stucture */
+{
+ FDKcrcInit(&pAdts->crcInfo, 0x8005, 0xFFFF, 16);
+}
+
+int adtsRead_CrcStartReg(
+ HANDLE_ADTS pAdts, /*!< pointer to adts stucture */
+ HANDLE_FDK_BITSTREAM hBs, /*!< handle to current bit buffer structure */
+ int mBits /*!< number of bits in crc region */
+ )
+{
+ if (pAdts->bs.protection_absent) {
+ return 0;
+ }
+
+ return ( FDKcrcStartReg(&pAdts->crcInfo, hBs, mBits) );
+
+}
+
+void adtsRead_CrcEndReg(
+ HANDLE_ADTS pAdts, /*!< pointer to adts crc info stucture */
+ HANDLE_FDK_BITSTREAM hBs, /*!< handle to current bit buffer structure */
+ int reg /*!< crc region */
+ )
+{
+ if (pAdts->bs.protection_absent == 0)
+ {
+ FDKcrcEndReg(&pAdts->crcInfo, hBs, reg);
+ }
+}
+
+TRANSPORTDEC_ERROR adtsRead_CrcCheck( HANDLE_ADTS pAdts )
+{
+ TRANSPORTDEC_ERROR ErrorStatus = TRANSPORTDEC_OK;
+ USHORT crc;
+
+ if (pAdts->bs.protection_absent)
+ return TRANSPORTDEC_OK;
+
+ crc = FDKcrcGetCRC(&pAdts->crcInfo);
+ if (crc != pAdts->crcReadValue)
+ {
+ return (TRANSPORTDEC_CRC_ERROR);
+ }
+
+ return (ErrorStatus);
+}
+
+
+
+#define Adts_Length_SyncWord 12
+#define Adts_Length_Id 1
+#define Adts_Length_Layer 2
+#define Adts_Length_ProtectionAbsent 1
+#define Adts_Length_Profile 2
+#define Adts_Length_SamplingFrequencyIndex 4
+#define Adts_Length_PrivateBit 1
+#define Adts_Length_ChannelConfiguration 3
+#define Adts_Length_OriginalCopy 1
+#define Adts_Length_Home 1
+#define Adts_Length_CopyrightIdentificationBit 1
+#define Adts_Length_CopyrightIdentificationStart 1
+#define Adts_Length_FrameLength 13
+#define Adts_Length_BufferFullness 11
+#define Adts_Length_NumberOfRawDataBlocksInFrame 2
+#define Adts_Length_CrcCheck 16
+
+TRANSPORTDEC_ERROR adtsRead_DecodeHeader(
+ HANDLE_ADTS pAdts,
+ CSAudioSpecificConfig *pAsc,
+ HANDLE_FDK_BITSTREAM hBs,
+ const INT ignoreBufferFullness
+ )
+{
+ INT crcReg;
+
+ INT valBits;
+ INT cmp_buffer_fullness;
+ int i, adtsHeaderLength;
+
+ STRUCT_ADTS_BS bs;
+
+#ifdef TP_PCE_ENABLE
+ CProgramConfig oldPce;
+ /* Store the old PCE temporarily. Maybe we'll need it later if we
+ have channelConfig=0 and no PCE in this frame. */
+ FDKmemcpy(&oldPce, &pAsc->m_progrConfigElement, sizeof(CProgramConfig));
+#endif
+
+ valBits = FDKgetValidBits(hBs);
+
+ /* adts_fixed_header */
+ bs.mpeg_id = FDKreadBits(hBs, Adts_Length_Id);
+ bs.layer = FDKreadBits(hBs, Adts_Length_Layer);
+ bs.protection_absent = FDKreadBits(hBs, Adts_Length_ProtectionAbsent);
+ bs.profile = FDKreadBits(hBs, Adts_Length_Profile);
+ bs.sample_freq_index = FDKreadBits(hBs, Adts_Length_SamplingFrequencyIndex);
+ bs.private_bit = FDKreadBits(hBs, Adts_Length_PrivateBit);
+ bs.channel_config = FDKreadBits(hBs, Adts_Length_ChannelConfiguration);
+ bs.original = FDKreadBits(hBs, Adts_Length_OriginalCopy);
+ bs.home = FDKreadBits(hBs, Adts_Length_Home);
+
+ /* adts_variable_header */
+ bs.copyright_id = FDKreadBits(hBs, Adts_Length_CopyrightIdentificationBit);
+ bs.copyright_start = FDKreadBits(hBs, Adts_Length_CopyrightIdentificationStart);
+ bs.frame_length = FDKreadBits(hBs, Adts_Length_FrameLength);
+ bs.adts_fullness = FDKreadBits(hBs, Adts_Length_BufferFullness);
+ bs.num_raw_blocks = FDKreadBits(hBs, Adts_Length_NumberOfRawDataBlocksInFrame);
+ bs.num_pce_bits = 0;
+
+ adtsHeaderLength = ADTS_HEADERLENGTH;
+
+ if (!bs.protection_absent) {
+ FDKcrcReset(&pAdts->crcInfo);
+ FDKpushBack(hBs, 56); /* complete fixed and variable header! */
+ crcReg = FDKcrcStartReg(&pAdts->crcInfo, hBs, 0);
+ FDKpushFor(hBs, 56);
+ }
+
+ if (! bs.protection_absent && bs.num_raw_blocks>0) {
+ for (i=0; i<bs.num_raw_blocks; i++) {
+ pAdts->rawDataBlockDist[i] = (USHORT)FDKreadBits(hBs, 16);
+ adtsHeaderLength += 16;
+ }
+ /* Change raw data blocks to delta values */
+ pAdts->rawDataBlockDist[bs.num_raw_blocks] = bs.frame_length - 7 - bs.num_raw_blocks*2 - 2 ;
+ for (i=bs.num_raw_blocks; i>0; i--) {
+ pAdts->rawDataBlockDist[i] -= pAdts->rawDataBlockDist[i-1];
+ }
+ }
+
+ /* adts_error_check */
+ if (!bs.protection_absent)
+ {
+ USHORT crc_check;
+
+ FDKcrcEndReg(&pAdts->crcInfo, hBs, crcReg);
+ crc_check = FDKreadBits(hBs, Adts_Length_CrcCheck);
+ adtsHeaderLength += Adts_Length_CrcCheck;
+
+ pAdts->crcReadValue = crc_check;
+ /* Check header CRC in case of multiple raw data blocks */
+ if (bs.num_raw_blocks > 0) {
+ if (pAdts->crcReadValue != FDKcrcGetCRC(&pAdts->crcInfo)) {
+ return TRANSPORTDEC_CRC_ERROR;
+ }
+ /* Reset CRC for the upcoming raw_data_block() */
+ FDKcrcReset(&pAdts->crcInfo);
+ }
+ }
+
+
+ /* check if valid header */
+ if (
+ (bs.layer != 0) || // we only support MPEG ADTS
+ (bs.sample_freq_index >= 13) // we only support 96kHz - 7350kHz
+ ) {
+ FDKpushFor(hBs, bs.frame_length * 8); // try again one frame later
+ return TRANSPORTDEC_UNSUPPORTED_FORMAT;
+ }
+
+ /* special treatment of id-bit */
+ if ( (bs.mpeg_id == 0) && (pAdts->decoderCanDoMpeg4 == 0) )
+ {
+ /* MPEG-2 decoder cannot play MPEG-4 bitstreams */
+
+
+ FDKpushFor(hBs, bs.frame_length * 8); // try again one frame later
+ return TRANSPORTDEC_UNSUPPORTED_FORMAT;
+ }
+
+ if (!ignoreBufferFullness)
+ {
+ cmp_buffer_fullness = bs.frame_length*8 + bs.adts_fullness*32*getNumberOfEffectiveChannels(bs.channel_config);
+
+
+ /* Evaluate buffer fullness */
+ if (bs.adts_fullness != 0x7FF)
+ {
+ if (pAdts->BufferFullnesStartFlag)
+ {
+ if ( valBits < cmp_buffer_fullness )
+ {
+ /* Condition for start of decoding is not fulfilled */
+
+ /* The current frame will not be decoded */
+ FDKpushBack(hBs, adtsHeaderLength);
+
+ if ( (cmp_buffer_fullness+adtsHeaderLength) > ((TRANSPORTDEC_INBUF_SIZE<<3)-7) ) {
+ return TRANSPORTDEC_SYNC_ERROR;
+ } else {
+ return TRANSPORTDEC_NOT_ENOUGH_BITS;
+ }
+ }
+ else
+ {
+ pAdts->BufferFullnesStartFlag = 0;
+ }
+ }
+ }
+ }
+
+
+ /* Get info from ADTS header */
+ AudioSpecificConfig_Init(pAsc);
+ pAsc->m_aot = (AUDIO_OBJECT_TYPE)(bs.profile + 1);
+ pAsc->m_samplingFrequencyIndex = bs.sample_freq_index;
+ pAsc->m_samplingFrequency = SamplingRateTable[bs.sample_freq_index];
+ pAsc->m_channelConfiguration = bs.channel_config;
+ pAsc->m_samplesPerFrame = 1024;
+
+#ifdef TP_PCE_ENABLE
+ if (bs.channel_config == 0)
+ {
+ int pceBits = 0;
+ UINT alignAnchor = FDKgetValidBits(hBs);
+
+ if (FDKreadBits(hBs,3) == ID_PCE) {
+ /* Got luck! Parse the PCE */
+ int crcReg;
+ crcReg = adtsRead_CrcStartReg(pAdts, hBs, 0);
+
+ CProgramConfig_Read(&pAsc->m_progrConfigElement, hBs, alignAnchor);
+
+ adtsRead_CrcEndReg(pAdts, hBs, crcReg);
+ pceBits = alignAnchor - FDKgetValidBits(hBs);
+ /* store the number of PCE bits */
+ bs.num_pce_bits = pceBits;
+ }
+ else {
+ /* No PCE in this frame! Push back the ID tag bits. */
+ FDKpushBack(hBs,3);
+
+ /* Encoders do not have to write a PCE in each frame.
+ So if we already have a valid PCE we have to use it. */
+ if ( oldPce.isValid
+ && (bs.sample_freq_index == pAdts->bs.sample_freq_index) /* we could compare the complete fixed header (bytes) here! */
+ && (bs.channel_config == pAdts->bs.channel_config) /* == 0 */
+ && (bs.mpeg_id == pAdts->bs.mpeg_id) )
+ { /* Restore previous PCE which is still valid */
+ FDKmemcpy(&pAsc->m_progrConfigElement, &oldPce, sizeof(CProgramConfig));
+ }
+ else if (bs.mpeg_id == 0) {
+ /* If not it seems that we have a implicit channel configuration.
+ This mode is not allowed in the context of ISO/IEC 14496-3.
+ Skip this frame and try the next one. */
+ FDKpushFor(hBs, (bs.frame_length<<3) - adtsHeaderLength - 3);
+ return TRANSPORTDEC_UNSUPPORTED_FORMAT;
+ }
+ /* else {
+ ISO/IEC 13818-7 implicit channel mapping is allowed.
+ So just open the box of chocolates to see what we got.
+ } */
+ }
+ }
+#endif /* TP_PCE_ENABLE */
+
+ /* Copy bit stream data struct to persistent memory now, once we passed all sanity checks above. */
+ FDKmemcpy(&pAdts->bs, &bs, sizeof(STRUCT_ADTS_BS));
+
+ return TRANSPORTDEC_OK;
+}
+
+int adtsRead_GetRawDataBlockLength(
+ HANDLE_ADTS pAdts,
+ INT blockNum
+ )
+{
+ int length;
+
+ if (pAdts->bs.num_raw_blocks == 0) {
+ length = (pAdts->bs.frame_length - 7) << 3; /* aac_frame_length subtracted by the header size (7 bytes). */
+ if (pAdts->bs.protection_absent == 0)
+ length -= 16; /* substract 16 bit CRC */
+ } else {
+ if (pAdts->bs.protection_absent) {
+ length = -1; /* raw data block length is unknown */
+ } else {
+ if (blockNum < 0 || blockNum > 3) {
+ return TRANSPORTDEC_INVALID_PARAMETER;
+ }
+ length = (pAdts->rawDataBlockDist[blockNum] << 3) - 16;
+ }
+ }
+ if (blockNum == 0) {
+ length -= pAdts->bs.num_pce_bits;
+ }
+ return length;
+}
+
+