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Diffstat (limited to 'media/libstagefright/codecs/aacdec/pvmp4audiodecoderconfig.cpp')
| -rw-r--r-- | media/libstagefright/codecs/aacdec/pvmp4audiodecoderconfig.cpp | 285 |
1 files changed, 285 insertions, 0 deletions
diff --git a/media/libstagefright/codecs/aacdec/pvmp4audiodecoderconfig.cpp b/media/libstagefright/codecs/aacdec/pvmp4audiodecoderconfig.cpp new file mode 100644 index 0000000..9208fa8 --- /dev/null +++ b/media/libstagefright/codecs/aacdec/pvmp4audiodecoderconfig.cpp @@ -0,0 +1,285 @@ +/* ------------------------------------------------------------------ + * 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: PVMP4AudioDecoderConfig + +------------------------------------------------------------------------------ + REVISION HISTORY + + Description: (1) Modified to decode AudioSpecificConfig for any frame number + pVars->bno + (2) Update the input and output descriptions + + Description: Eliminated search for ADIF header + + Description: Added support for AAC+ + + Who: Date: + 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. + + 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 + + +------------------------------------------------------------------------------ + REQUIREMENTS + + PacketVideo Document # CCC-AUD-AAC-ERS-0003 + +------------------------------------------------------------------------------ + REFERENCES + + (1) ISO/IEC 14496-3: 1999(E) + subclause 1.6 + +------------------------------------------------------------------------------ + 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 "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 */ + + +/*---------------------------------------------------------------------------- +; 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 +----------------------------------------------------------------------------*/ + +OSCL_EXPORT_REF Int PVMP4AudioDecoderConfig( + tPVMP4AudioDecoderExternal *pExt, + void *pMem) +{ + + UInt initialUsedBits; /* Unsigned for C55x */ + tDec_Int_File *pVars; /* Helper pointer */ + + Int status = MP4AUDEC_INCOMPLETE_FRAME; + + /* + * Initialize "helper" pointers to existing memory. + */ + pVars = (tDec_Int_File *)pMem; + /* + * Translate input buffer variables. + */ + pVars->inputStream.pBuffer = pExt->pInputBuffer; + + pVars->inputStream.inputBufferCurrentLength = + (UInt)pExt->inputBufferCurrentLength; + + pVars->inputStream.availableBits = + (UInt)(pExt->inputBufferCurrentLength << INBUF_ARRAY_INDEX_SHIFT); + + initialUsedBits = + (UInt)((pExt->inputBufferUsedLength << INBUF_ARRAY_INDEX_SHIFT) + + pExt->remainderBits); + + pVars->inputStream.usedBits = initialUsedBits; + + if (initialUsedBits <= pVars->inputStream.availableBits) + { + + /* + * Buffer is not overrun, then + * decode the AudioSpecificConfig() structure + */ + + pVars->aacConfigUtilityEnabled = false; /* set aac dec mode */ + + status = get_audio_specific_config(pVars); + + } + + byte_align(&pVars->inputStream); + + + if (status == SUCCESS) + { + + pVars->bno++; + + /* + * A possible improvement would be to set these values only + * when they change. + */ + pExt->samplingRate = + samp_rate_info[pVars->prog_config.sampling_rate_idx].samp_rate; + + /* + * we default to 2 channel, even for mono files, (where channels have same content) + * this is done to ensure support for enhanced aac+ with implicit signalling + */ + pExt->aacPlusEnabled = pVars->aacPlusEnabled; + +// pExt->encodedChannels = pVars->mc_info.nch; + + pExt->encodedChannels = 2; + + pExt->frameLength = pVars->frameLength; +#ifdef AAC_PLUS + pExt->aacPlusUpsamplingFactor = pVars->mc_info.upsamplingFactor; +#endif + + } + else + { + /* + * Default to nonrecoverable error status unless there is a Buffer overrun + */ + status = MP4AUDEC_INVALID_FRAME; + + if (pVars->inputStream.usedBits > pVars->inputStream.availableBits) + { + /* all bits were used but were not enough to complete parsing */ + pVars->inputStream.usedBits = pVars->inputStream.availableBits; + + status = MP4AUDEC_INCOMPLETE_FRAME; /* audio config too small */ + } + + } + + /* + * Translate from units of bits back into units of words. + */ + + pExt->inputBufferUsedLength = + pVars->inputStream.usedBits >> INBUF_ARRAY_INDEX_SHIFT; + + pExt->remainderBits = pVars->inputStream.usedBits & INBUF_BIT_MODULO_MASK; + + pVars->status = status; + + return (status); + +} /* PVMP4AudioDecoderDecodeFrame */ + |