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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.
+ * -------------------------------------------------------------------
+ */
+/****************************************************************************************
+Portions of this file are derived from the following 3GPP standard:
+
+ 3GPP TS 26.073
+ ANSI-C code for the Adaptive Multi-Rate (AMR) speech codec
+ Available from http://www.3gpp.org
+
+(C) 2004, 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TTA, TTC)
+Permission to distribute, modify and use this file under the standard license
+terms listed above has been obtained from the copyright holder.
+****************************************************************************************/
+/*
+------------------------------------------------------------------------------
+
+
+
+ Pathname: ./audio/gsm-amr/c/src/g_adapt.c
+ Functions:
+
+ Date: 02/04/2002
+
+------------------------------------------------------------------------------
+ REVISION HISTORY
+
+ Description: Updated template used to PV coding template.
+ Changed to accept the pOverflow flag for EPOC compatibility.
+
+ Description: Replaced OSCL mem type functions and eliminated include
+ files that now are chosen by OSCL definitions
+
+ Description: Replaced "int" and/or "char" with OSCL defined types.
+
+ Description:
+
+------------------------------------------------------------------------------
+ MODULE DESCRIPTION
+
+
+------------------------------------------------------------------------------
+*/
+
+/*----------------------------------------------------------------------------
+; INCLUDES
+----------------------------------------------------------------------------*/
+#include <stdlib.h>
+
+#include "g_adapt.h"
+#include "typedef.h"
+#include "basic_op.h"
+#include "oper_32b.h"
+#include "cnst.h"
+#include "gmed_n.h"
+
+/*----------------------------------------------------------------------------
+; MACROS
+; Define module specific macros here
+----------------------------------------------------------------------------*/
+
+/*----------------------------------------------------------------------------
+; DEFINES
+; Include all pre-processor statements here. Include conditional
+; compile variables also.
+----------------------------------------------------------------------------*/
+#define LTP_GAIN_THR1 2721 /* 2721 Q13 = 0.3322 ~= 1.0 / (10*log10(2)) */
+#define LTP_GAIN_THR2 5443 /* 5443 Q13 = 0.6644 ~= 2.0 / (10*log10(2)) */
+
+/*----------------------------------------------------------------------------
+; LOCAL FUNCTION DEFINITIONS
+; Function Prototype declaration
+----------------------------------------------------------------------------*/
+
+/*----------------------------------------------------------------------------
+; LOCAL VARIABLE DEFINITIONS
+; Variable declaration - defined here and used outside this module
+----------------------------------------------------------------------------*/
+
+
+/*
+------------------------------------------------------------------------------
+ FUNCTION NAME: gain_adapt_init
+------------------------------------------------------------------------------
+ INPUT AND OUTPUT DEFINITIONS
+
+ Inputs:
+ st -- double pointer to GainAdaptState
+
+ Outputs:
+ st -- double ponter to GainAdaptState
+
+ Returns:
+ -1 if an error occurs during memory initialization
+ 0 if OK
+
+ Global Variables Used:
+ None
+
+ Local Variables Needed:
+ None
+
+------------------------------------------------------------------------------
+ FUNCTION DESCRIPTION
+
+ Allocates state memory and initializes state memory
+
+------------------------------------------------------------------------------
+ REQUIREMENTS
+
+ None
+
+------------------------------------------------------------------------------
+ REFERENCES
+
+ g_adapt.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001
+
+------------------------------------------------------------------------------
+ PSEUDO-CODE
+
+
+------------------------------------------------------------------------------
+ RESOURCES USED [optional]
+
+ When the code is written for a specific target processor the
+ the resources used should be documented below.
+
+ HEAP MEMORY USED: x bytes
+
+ STACK MEMORY USED: x bytes
+
+ CLOCK CYCLES: (cycle count equation for this function) + (variable
+ used to represent cycle count for each subroutine
+ called)
+ where: (cycle count variable) = cycle count for [subroutine
+ name]
+
+------------------------------------------------------------------------------
+ CAUTION [optional]
+ [State any special notes, constraints or cautions for users of this function]
+
+------------------------------------------------------------------------------
+*/
+
+Word16 gain_adapt_init(GainAdaptState **st)
+{
+ GainAdaptState* s;
+
+ if (st == (GainAdaptState **) NULL)
+ {
+ /* fprintf(stderr, "gain_adapt_init: invalid parameter\n"); */
+ return -1;
+ }
+ *st = NULL;
+
+ /* allocate memory */
+ if ((s = (GainAdaptState *) malloc(sizeof(GainAdaptState))) == NULL)
+ {
+ /* fprintf(stderr, "gain_adapt_init: can't malloc state structure\n"); */
+ return -1;
+ }
+ gain_adapt_reset(s);
+ *st = s;
+
+ return 0;
+}
+
+/*
+------------------------------------------------------------------------------
+ FUNCTION NAME: gain_adapt_reset
+------------------------------------------------------------------------------
+ INPUT AND OUTPUT DEFINITIONS
+
+ Inputs:
+ st -- double pointer to GainAdaptState
+
+ Outputs:
+ st -- double ponter to GainAdaptState
+
+ Returns:
+ -1 if an error occurs
+ 0 if OK
+
+ Global Variables Used:
+ None
+
+ Local Variables Needed:
+ None
+
+------------------------------------------------------------------------------
+ FUNCTION DESCRIPTION
+
+ Initializes state memory to zero
+------------------------------------------------------------------------------
+ REQUIREMENTS
+
+ None
+
+------------------------------------------------------------------------------
+ REFERENCES
+
+ g_adapt.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001
+
+------------------------------------------------------------------------------
+ PSEUDO-CODE
+
+
+------------------------------------------------------------------------------
+ RESOURCES USED [optional]
+
+ When the code is written for a specific target processor the
+ the resources used should be documented below.
+
+ HEAP MEMORY USED: x bytes
+
+ STACK MEMORY USED: x bytes
+
+ CLOCK CYCLES: (cycle count equation for this function) + (variable
+ used to represent cycle count for each subroutine
+ called)
+ where: (cycle count variable) = cycle count for [subroutine
+ name]
+
+------------------------------------------------------------------------------
+ CAUTION [optional]
+ [State any special notes, constraints or cautions for users of this function]
+
+------------------------------------------------------------------------------
+*/
+
+Word16 gain_adapt_reset(GainAdaptState *st)
+{
+ Word16 i;
+
+ if (st == (GainAdaptState *) NULL)
+ {
+ /* fprintf(stderr, "gain_adapt_reset: invalid parameter\n"); */
+ return -1;
+ }
+
+ st->onset = 0;
+ st->prev_alpha = 0;
+ st->prev_gc = 0;
+
+ for (i = 0; i < LTPG_MEM_SIZE; i++)
+ {
+ st->ltpg_mem[i] = 0;
+ }
+
+ return 0;
+}
+
+
+/*
+------------------------------------------------------------------------------
+ FUNCTION NAME: gain_adapt_exit
+------------------------------------------------------------------------------
+ INPUT AND OUTPUT DEFINITIONS
+
+ Inputs:
+ st -- double pointer to GainAdaptState
+
+ Outputs:
+ None
+
+ Returns:
+ None
+
+ Global Variables Used:
+ None
+
+ Local Variables Needed:
+ None
+
+------------------------------------------------------------------------------
+ FUNCTION DESCRIPTION
+
+ The memory used for state memory is freed
+------------------------------------------------------------------------------
+ REQUIREMENTS
+
+ None
+
+------------------------------------------------------------------------------
+ REFERENCES
+
+ g_adapt.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001
+
+------------------------------------------------------------------------------
+ PSEUDO-CODE
+
+
+------------------------------------------------------------------------------
+ RESOURCES USED [optional]
+
+ When the code is written for a specific target processor the
+ the resources used should be documented below.
+
+ HEAP MEMORY USED: x bytes
+
+ STACK MEMORY USED: x bytes
+
+ CLOCK CYCLES: (cycle count equation for this function) + (variable
+ used to represent cycle count for each subroutine
+ called)
+ where: (cycle count variable) = cycle count for [subroutine
+ name]
+
+------------------------------------------------------------------------------
+ CAUTION [optional]
+ [State any special notes, constraints or cautions for users of this function]
+
+------------------------------------------------------------------------------
+*/
+
+void gain_adapt_exit(GainAdaptState **st)
+{
+ if (st == NULL || *st == NULL)
+ return;
+
+ /* deallocate memory */
+ free(*st);
+ *st = NULL;
+
+ return;
+}
+
+/*
+------------------------------------------------------------------------------
+ FUNCTION NAME: gain_adapt
+------------------------------------------------------------------------------
+ INPUT AND OUTPUT DEFINITIONS
+
+ Inputs:
+ st -- double pointer to GainAdaptState
+ ltpg -- Word16 -- ltp coding gain (log2()), Q13
+ gain_cod -- Word16 -- code gain, Q1
+
+ Outputs:
+ alpha -- Pointer to Word16 -- gain adaptation factor, Q15
+ pOverflow -- Pointer to Flag -- overflow indicator
+
+ Returns:
+ None
+
+ Global Variables Used:
+ None
+
+ Local Variables Needed:
+ None
+
+------------------------------------------------------------------------------
+ FUNCTION DESCRIPTION
+
+ Purpose: calculate pitch/codebook gain adaptation factor alpha
+ (and update the adaptor state)
+
+------------------------------------------------------------------------------
+ REQUIREMENTS
+
+ None
+
+------------------------------------------------------------------------------
+ REFERENCES
+
+ g_adapt.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001
+
+------------------------------------------------------------------------------
+ PSEUDO-CODE
+
+
+------------------------------------------------------------------------------
+ RESOURCES USED [optional]
+
+ When the code is written for a specific target processor the
+ the resources used should be documented below.
+
+ HEAP MEMORY USED: x bytes
+
+ STACK MEMORY USED: x bytes
+
+ CLOCK CYCLES: (cycle count equation for this function) + (variable
+ used to represent cycle count for each subroutine
+ called)
+ where: (cycle count variable) = cycle count for [subroutine
+ name]
+
+------------------------------------------------------------------------------
+ CAUTION [optional]
+ [State any special notes, constraints or cautions for users of this function]
+
+------------------------------------------------------------------------------
+*/
+
+void gain_adapt(
+ GainAdaptState *st, /* i : state struct */
+ Word16 ltpg, /* i : ltp coding gain (log2()), Q13 */
+ Word16 gain_cod, /* i : code gain, Q1 */
+ Word16 *alpha, /* o : gain adaptation factor, Q15 */
+ Flag *pOverflow
+)
+{
+ Word16 adapt; /* adaptdation status; 0, 1, or 2 */
+ Word16 result; /* alpha factor, Q13 */
+ Word16 filt; /* median-filtered LTP coding gain, Q13 */
+ Word16 tmp;
+ Word16 i;
+
+ /* basic adaptation */
+ if (ltpg <= LTP_GAIN_THR1)
+ {
+ adapt = 0;
+ }
+ else
+ {
+ if (ltpg <= LTP_GAIN_THR2)
+ {
+ adapt = 1;
+ }
+ else
+ {
+ adapt = 2;
+ }
+ }
+
+ /*
+ * // onset indicator
+ * if ((cbGain > onFact * cbGainMem[0]) && (cbGain > 100.0))
+ * onset = 8;
+ * else
+ * if (onset)
+ * onset--;
+ */
+ /* tmp = cbGain / onFact; onFact = 2.0; 200 Q1 = 100.0 */
+ tmp = shr_r(gain_cod, 1, pOverflow);
+
+ if ((tmp > st->prev_gc) && (gain_cod > 200))
+ {
+ st->onset = 8;
+ }
+ else
+ {
+ if (st->onset != 0)
+ {
+ st->onset = sub(st->onset, 1, pOverflow);
+ }
+ }
+
+ /*
+ * // if onset, increase adaptor state
+ * if (onset && (gainAdapt < 2)) gainAdapt++;
+ */
+ if ((st->onset != 0) && (adapt < 2))
+ {
+ adapt = add(adapt, 1, pOverflow);
+ }
+
+ st->ltpg_mem[0] = ltpg;
+ filt = gmed_n(st->ltpg_mem, 5); /* function result */
+
+ if (adapt == 0)
+ {
+ if (filt > 5443) /* 5443 Q13 = 0.66443... */
+ {
+ result = 0;
+ }
+ else
+ {
+ if (filt < 0)
+ {
+ result = 16384; /* 16384 Q15 = 0.5 */
+ }
+ else
+ { /* result = 0.5 - 0.75257499*filt */
+ /* result (Q15) = 16384 - 24660 * (filt << 2) */
+ filt = shl(filt, 2, pOverflow); /* Q15 */
+ result = mult(24660, filt, pOverflow);
+ result = sub(16384, result, pOverflow);
+ }
+ }
+ }
+ else
+ {
+ result = 0;
+ }
+ /*
+ * if (prevAlpha == 0.0) result = 0.5 * (result + prevAlpha);
+ */
+ if (st->prev_alpha == 0)
+ {
+ result = shr(result, 1, pOverflow);
+ }
+
+ /* store the result */
+ *alpha = result;
+
+ /* update adapter state memory */
+ st->prev_alpha = result;
+ st->prev_gc = gain_cod;
+
+ for (i = LTPG_MEM_SIZE - 1; i > 0; i--)
+ {
+ st->ltpg_mem[i] = st->ltpg_mem[i-1];
+ }
+ /* mem[0] is just present for convenience in calling the gmed_n[5]
+ * function above. The memory depth is really LTPG_MEM_SIZE-1.
+ */
+}
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