| /* ------------------------------------------------------------------ |
| * Copyright (C) 2008 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: codecs/audio/aac/c/src/getactualAacConfig |
| |
| Date: 06/23/2005 |
| |
| ------------------------------------------------------------------------------ |
| REVISION HISTORY |
| |
| Description: |
| |
| ------------------------------------------------------------------------------ |
| INPUT AND OUTPUT DEFINITIONS |
| |
| Inputs: |
| pExt = pointer to the external interface structure. See the file |
| PVMP4AudioDecoder_API.h for a description of each field. |
| Data type of pointer to a tPVMP4AudioDecoderExternal |
| structure. |
| |
| pExt->pInputBuffer: pointer to input buffer containing input |
| bitstream |
| |
| pExt->inputBufferCurrentLength: number of bytes in the input buffer |
| |
| pExt->inputBufferUsedLength: number of bytes already consumed in |
| input buffer |
| |
| pExt->remainderBits: number of bits consumed in addition to |
| pExt->inputBufferUsedLength |
| |
| pMem = void pointer to hide the internal implementation of the library |
| It is cast back to a tDec_Int_File structure. This structure |
| contains information that needs to persist between calls to |
| this function, or is too big to be placed on the stack, even |
| though the data is only needed during execution of this function |
| Data type void pointer, internally pointer to a tDec_Int_File |
| structure. |
| |
| aStream = pointer to a UChar* stream that holds the input stream. |
| |
| aProperty = pointer to a structure DecodeProperties (define in include file) |
| |
| Local Stores/Buffers/Pointers Needed: None |
| (The memory set aside in pMem performs this task) |
| |
| Global Stores/Buffers/Pointers Needed: None |
| |
| Outputs: |
| status = 0 if no error occurred |
| MP4AUDEC_NONRECOVERABLE if a non-recoverable error occurred |
| MP4AUDEC_RECOVERABLE if a recoverable error occurred. |
| Presently a recoverable error does not exist, but this |
| was a requirement. |
| |
| |
| Pointers and Buffers Modified: |
| pMem contents are modified. |
| pExt: (more detail in the file PVMP4AudioDecoder_API.h) |
| inputBufferUsedLength - number of array elements used up by the stream. |
| remainderBits - remaining bits in the next UInt32 buffer |
| samplingRate - sampling rate in samples per sec |
| encodedChannels - channels found on the file (informative) |
| frameLength - length of the frame |
| |
| Local Stores Modified: None. |
| |
| Global Stores Modified: None. |
| |
| ------------------------------------------------------------------------------ |
| FUNCTION DESCRIPTION |
| |
| |
| ------------------------------------------------------------------------------ |
| ------------------------------------------------------------------------------ |
| */ |
| |
| |
| /*---------------------------------------------------------------------------- |
| ; INCLUDES |
| ----------------------------------------------------------------------------*/ |
| |
| #include "getactualaacconfig.h" |
| #include "pv_audio_type_defs.h" |
| #include "s_tdec_int_file.h" |
| #include "ibstream.h" /* where #define INBUF_ARRAY_INDEX_SHIFT */ |
| #include "sfb.h" /* Where samp_rate_info[] is declared */ |
| |
| #include "get_audio_specific_config.h" |
| #include "pvmp4audiodecoder_api.h" /* Where this function is declared */ |
| |
| #include "oscl_error_codes.h" |
| #include "oscl_exception.h" |
| #include "oscl_mem.h" |
| #include "e_elementid.h" |
| #include "e_sbr_element_id.h" |
| #include "get_dse.h" |
| #include "get_sbr_bitstream.h" |
| #include "get_prog_config.h" |
| #include "huffman.h" /* where huffdecode is declared */ |
| #include "e_sbr_error.h" |
| #include "sbr_read_data.h" |
| #include "sbr_open.h" |
| |
| /*---------------------------------------------------------------------------- |
| ; MACROS |
| ; Define module specific macros here |
| ----------------------------------------------------------------------------*/ |
| |
| /*---------------------------------------------------------------------------- |
| ; DEFINES |
| ; Include all pre-processor statements here. Include conditional |
| ; compile variables also. |
| ----------------------------------------------------------------------------*/ |
| |
| #define ERROR_BUFFER_OVERRUN (-2) |
| #define KCODEC_INIT_FAILURE (-1) |
| #define LEFT (0) |
| #define RIGHT (1) |
| |
| /*---------------------------------------------------------------------------- |
| ; 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 |
| ----------------------------------------------------------------------------*/ |
| |
| #include "oscl_dll.h" |
| OSCL_DLL_ENTRY_POINT_DEFAULT() |
| |
| |
| OSCL_EXPORT_REF int32 GetActualAacConfig(uint8* aConfigHeader, |
| uint8* aAudioObjectType, |
| int32* aConfigHeaderSize, |
| uint8* SamplingRateIndex, |
| uint32* NumChannels) |
| { |
| |
| tPVMP4AudioDecoderExternal * iAACDecExt = NULL; |
| UInt initialUsedBits; /* Unsigned for C55x */ |
| tDec_Int_File *pVars; /* Helper pointer */ |
| MC_Info *pMC_Info; /* Helper pointer */ |
| |
| |
| Int status = ERROR_BUFFER_OVERRUN; |
| |
| |
| |
| /* |
| * Allocate memory to decode one AAC frame |
| */ |
| |
| if (!iAACDecExt) |
| { |
| iAACDecExt = new tPVMP4AudioDecoderExternal; |
| if (!iAACDecExt) |
| { |
| return 1; |
| } |
| iAACDecExt->inputBufferCurrentLength = 0; |
| } |
| |
| iAACDecExt->pInputBuffer = aConfigHeader; |
| iAACDecExt->inputBufferMaxLength = PVMP4AUDIODECODER_INBUFSIZE; |
| |
| |
| iAACDecExt->inputBufferUsedLength = 0; |
| iAACDecExt->remainderBits = 0; |
| |
| int32 memreq = PVMP4AudioDecoderGetMemRequirements(); |
| |
| uint8 *pMem = OSCL_ARRAY_NEW(uint8 , memreq); |
| |
| if (pMem == 0) |
| { |
| return KCODEC_INIT_FAILURE; |
| } |
| |
| if (PVMP4AudioDecoderInitLibrary(iAACDecExt, pMem) != 0) |
| { |
| return KCODEC_INIT_FAILURE; |
| } |
| |
| iAACDecExt->inputBufferCurrentLength = *aConfigHeaderSize; |
| |
| |
| /* |
| * Initialize "helper" pointers to existing memory. |
| */ |
| |
| pVars = (tDec_Int_File *)pMem; |
| |
| |
| pMC_Info = &pVars->mc_info; |
| |
| |
| |
| /* |
| * Translate input buffer variables. |
| */ |
| pVars->inputStream.pBuffer = iAACDecExt->pInputBuffer; |
| |
| pVars->inputStream.availableBits = |
| (UInt)(iAACDecExt->inputBufferCurrentLength << INBUF_ARRAY_INDEX_SHIFT); |
| |
| initialUsedBits = |
| (UInt)((iAACDecExt->inputBufferUsedLength << INBUF_ARRAY_INDEX_SHIFT) + |
| iAACDecExt->remainderBits); |
| |
| pVars->inputStream.inputBufferCurrentLength = |
| (UInt)iAACDecExt->inputBufferCurrentLength; |
| |
| pVars->inputStream.usedBits = initialUsedBits; |
| |
| pVars->aacPlusEnabled = true; /* Always enable aacplus decoding */ |
| |
| |
| if (initialUsedBits <= pVars->inputStream.availableBits) |
| { |
| /* |
| * Buffer is not overrun, then |
| * decode the AudioSpecificConfig() structure |
| */ |
| status = get_audio_specific_config(pVars); |
| |
| } |
| |
| |
| byte_align(&pVars->inputStream); |
| |
| *aConfigHeaderSize = (Int32)((pVars->inputStream.usedBits) >> 3); |
| |
| |
| *SamplingRateIndex = pVars->prog_config.sampling_rate_idx; |
| |
| *NumChannels = pVars->mc_info.nch; |
| |
| *aAudioObjectType = pVars->mc_info.audioObjectType; |
| |
| /* |
| * Set parameters based on the explicit information from the |
| * audio specific config |
| */ |
| |
| if (pVars->mc_info.sbrPresentFlag) |
| { |
| if (pVars->mc_info.psPresentFlag) |
| { |
| *NumChannels += 1; |
| } |
| } |
| |
| |
| pVars->status = status; |
| |
| /* |
| * Clear allocated memory |
| */ |
| if (pMem != NULL) |
| { |
| OSCL_ARRAY_DELETE(pMem); |
| pMem = NULL; |
| } |
| |
| if (iAACDecExt) |
| { |
| OSCL_DELETE(iAACDecExt); |
| iAACDecExt = NULL; |
| } |
| |
| return status; |
| } |