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+/* ------------------------------------------------------------------
+ * 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/set_mc_info.c
+
+------------------------------------------------------------------------------
+ REVISION HISTORY
+
+ Description: Modified per review comments
+
+ Description: Change audioObjectType from Int to enum types
+
+ Who: Date:
+ Description:
+
+------------------------------------------------------------------------------
+ INPUT AND OUTPUT DEFINITIONS
+
+ Inputs:
+ pMC_Info = pointer to structure MC_Info that holds information of
+ multiple channels' configurations
+ Data type pointer to MC_Info
+
+ objectType = variable that holds the Audio Object Type of current
+ file/bitstream.
+ Data type Int
+
+ sampling_rate_idx = variable that indicates the sampling rate of the
+ source file being encoded
+ Data Type Int
+
+ tag = variable that stores the element instance tag of the
+ first (front) channel element.
+ Data type Int
+
+ is_cpe = variable that indicates if a Channel Pair Element (CPE)
+ or a Single Channel Element (SCE) is used.
+ Data type Int (maybe Boolean)
+
+ pWinSeqInfo = array of pointers that points to structures holding
+ frame information of long and short window sequences.
+ Data type FrameInfo
+
+ pSfbwidth128 = array that will store the scalefactor bandwidth of
+ short window sequence frame.
+ Data type Int array
+
+ Local Stores/Buffers/Pointers Needed:
+ None
+
+ Global Stores/Buffers/Pointers Needed:
+ None
+
+ Outputs:
+ return SUCCESS
+
+ Pointers and Buffers Modified:
+ pMC_Info->nch contains the number of channels depending
+ upon if CPE or SCE is used
+ pMC_Info->objectType contents updated with the decoded Audio
+ Object Type
+
+ pMC_Info->ch_info.tag contents updated with the value of decoded
+ channel element tag
+
+ PMC_Info->ch_info.cpe contents updated depending upon if CPE or
+ SCE is used
+
+ pWinSeqInfo contents updated by calling infoinit if
+ sampling_rate_idx is different from
+ previous value
+
+ pSfbWidth128 contents updated by calling infoinit if
+ sampling_rate_idx is different from
+ previous value
+
+ Local Stores Modified:
+ None
+
+ Global Stores Modified:
+ None
+
+------------------------------------------------------------------------------
+ FUNCTION DESCRIPTION
+
+ This function initializes the channel configuration information. The
+ structure MC_Info stores the number of channels, channel element tag.
+ If sampling rate index is different from the previous value,
+ The frame information will be updated by calling infoinit.c
+
+------------------------------------------------------------------------------
+ REQUIREMENTS
+
+ This function shall update the relevant information on channel configs
+
+------------------------------------------------------------------------------
+ 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 1 p20 Table 1.6.3
+ Subpart 4 p30 5.1.2.1
+ Subpart 4 p31 4.5.2.1.1
+
+------------------------------------------------------------------------------
+ PSEUDO-CODE
+
+ pMC_Info->nch = 0;
+
+ pMC_Info->profile = objectType;
+
+ IF (pMC_Info->sampling_rate_idx != sampling_rate_idx)
+ THEN
+ pMC_Info->sampling_rate_idx = sampling_rate_idx;
+
+ CALL infoinit(
+ samp_rate_idx = sampling_rate_idx
+ ppWin_seq_info= pWinSeqInfo
+ pSfbwidth128 = pSfbwidth128)
+ MODIFYING(pWinSeqInfo, pSfbwidth128)
+ RETURNING(None)
+ ENDIF
+
+ pCh_Info = &pMC_Info->ch_info[0];
+ pCh_Info->tag = tag;
+
+ IF (is_cpe == FALSE)
+ THEN
+ pCh_Info->cpe = FALSE;
+
+ pMC_Info->nch = 1;
+
+ ELSE
+ pCh_Info->cpe = TRUE;
+ pCh_Info = &pMC_Info->ch_info[1];
+ pCh_Info->tag = tag;
+ pCh_Info->cpe = TRUE;
+
+ pMC_Info->nch = 2;
+
+ ENDIF
+
+ RETURN(SUCCESS)
+
+------------------------------------------------------------------------------
+ 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 "set_mc_info.h"
+#include "huffman.h"
+#include "s_ch_info.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
+----------------------------------------------------------------------------*/
+Int set_mc_info(
+ MC_Info *pMC_Info,
+ const tMP4AudioObjectType audioObjectType, /* used to be profile */
+ const Int sampling_rate_idx,
+ const Int tag, /* always pass-in last element's value */
+ const Int is_cpe,
+ FrameInfo *pWinSeqInfo[],
+ Int sfbwidth128[]
+)
+{
+ Ch_Info *pCh_Info; /*optional task: eliminate this structure */
+
+ /*
+ * audioObjectType and sampling rate
+ * re-configure if new sampling rate
+ *
+ */
+ pMC_Info->audioObjectType = audioObjectType;
+
+ if (pMC_Info->sampling_rate_idx != sampling_rate_idx)
+ {
+ pMC_Info->sampling_rate_idx = sampling_rate_idx;
+
+ Int status;
+ status = infoinit(sampling_rate_idx,
+ pWinSeqInfo,
+ sfbwidth128);
+ if (SUCCESS != status)
+ {
+ return 1;
+ }
+ }
+
+ /*
+ * first setup values for mono config, Single Channel Element (SCE)
+ * then if stereo, go inside if(is_cpe != FALSE) branch to setup
+ * values for stereo.
+ * set the channel counts
+ * save tag for left channel
+ */
+ pMC_Info->nch = 1 + is_cpe;
+
+ pCh_Info = &pMC_Info->ch_info[0];
+ pCh_Info->tag = tag;
+ pCh_Info->cpe = is_cpe;
+
+ /* This if branch maybe deleted in the future */
+ if (is_cpe != FALSE)
+ {
+ /* Channel Pair Element (CPE) */
+ /* right channel*/
+ pCh_Info = &pMC_Info->ch_info[1];
+ pCh_Info->cpe = TRUE;
+
+ }
+
+ return(SUCCESS); /* possible future error checkings */
+}
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