xref: /frameworks/base/media/libstagefright/codecs/amrnb/dec/src/sp_dec.cpp

/* ------------------------------------------------------------------
 * 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/sp_dec.c
 Functions: GSMInitDecode
            Speech_Decode_Frame_reset
            GSMDecodeFrameExit
            GSMFrameDecode

     Date: 08/03/2001

------------------------------------------------------------------------------
 REVISION HISTORY

 Description: Add PV coding template. Filled out template sections and
              reformatted code to follow C coding standard. Removed code that
              handles SID in GSMFrameDecode.

 Description: Made the following changes per comments from Phase 2/3 review:
              1. Updated to more recent PV C coding template.
              2. Took out all the tabs in the file and replaced with spaces.
              3. Deleted bit_offset from input list of GSMFrameDecode.

 Description: Changing several variables passed into these functions of type
              Speech_Decode_FrameState to type void.

 Description: Cleaning up brackets and line spacing for statements with
              brackets as per a review comments.

 Description: Synchronized file with UMTS version 3.2.0. Removed unnecessary
              include files.

 Description: Removed all references to malloc/free, except for the top-level
 malloc in GSMInitDecode, and corresponding free in GSMDecodeFrameExit.

 Also, modified function calls throughout to reflect the fact that the members
 of the structure Decoder_amrState are no longer pointers to be set via
 malloc, but full-blown structures.  (Changes of the type D_plsfState *lsfState
 to D_plsfState lsfState)

 Description: Created overflow and pass the variable into the decoder.

 Description: Changed inititlaization of the pointer to overflow flag. Removed
              code related to MOPS counter.

 Description:  Replaced OSCL mem type functions and eliminated include
               files that now are chosen by OSCL definitions

 Description:  Replaced "int" and/or "char" with defined types.
               Added proper casting (Word32) to some left shifting operations

 Description:

------------------------------------------------------------------------------
 MODULE DESCRIPTION

 This file contains the functions that initialize, invoke, reset, and exit
 the GSM AMR decoder.

------------------------------------------------------------------------------
*/

/*----------------------------------------------------------------------------
; INCLUDES
----------------------------------------------------------------------------*/
#include <stdlib.h>

#include "sp_dec.h"
#include "typedef.h"
#include "cnst.h"
#include "dec_amr.h"
#include "pstfilt.h"
#include "bits2prm.h"
#include "mode.h"
#include "post_pro.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 VARIABLE DEFINITIONS
; Variable declaration - defined here and used outside this module
----------------------------------------------------------------------------*/


/*
------------------------------------------------------------------------------
 FUNCTION NAME: GSMInitDecode
------------------------------------------------------------------------------
 INPUT AND OUTPUT DEFINITIONS

 Inputs:
    state = pointer to an array of pointers to structures of type
            Speech_Decode_FrameState
    no_hp_post_MR122 = flag to turn off high-pass post filter for 12.2 kbps
                       mode (Flag)
    id = pointer to an array whose contents are of type char

 Outputs:
    decoder_amrState field of the structure pointed to by the pointer pointed
       to by state is set to NULL
    post_state field of the structure pointed to by the pointer pointed to
      by state is set to NULL
    postHP_state field of the structure pointed to by the pointer pointed to
      by state is set to NULL
    no_hp_post_MR122 field of the structure pointed to by the pointer pointed
      to by state is set to the input no_hp_post_MR122

 Returns:
    return_value = set to zero, if initialization was successful; -1,
                   otherwise (int)

 Global Variables Used:
    None

 Local Variables Needed:
    None

------------------------------------------------------------------------------
 FUNCTION DESCRIPTION

 This function allocates memory for filter structure and initializes state
 memory used by the GSM AMR decoder.

------------------------------------------------------------------------------
 REQUIREMENTS

 None

------------------------------------------------------------------------------
 REFERENCES

 sp_dec.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001

------------------------------------------------------------------------------
 PSEUDO-CODE

 Note: Original function name of Speech_Decode_Frame_init was changed to
       GSMInitDecode in the Code section.

int Speech_Decode_Frame_init (Speech_Decode_FrameState **state,
                              char *id)
{
  Speech_Decode_FrameState* s;

  if (state == (Speech_Decode_FrameState **) NULL){
      fprintf(stderr, "Speech_Decode_Frame_init: invalid parameter\n");
      return -1;
  }
  *state = NULL;

  // allocate memory
  if ((s= (Speech_Decode_FrameState *)
          malloc(sizeof(Speech_Decode_FrameState))) == NULL) {
      fprintf(stderr, "Speech_Decode_Frame_init: can not malloc state "
              "structure\n");
      return -1;
  }
  s->decoder_amrState = NULL;
  s->post_state = NULL;
  s->postHP_state = NULL;

  if (Decoder_amr_init(&s->decoder_amrState) ||
      Post_Filter_init(&s->post_state) ||
      Post_Process_init(&s->postHP_state) ) {
      Speech_Decode_Frame_exit(&s);
      return -1;
  }

  s->complexityCounter = getCounterId(id);

  Speech_Decode_Frame_reset(s);
  *state = s;

  return 0;
}

------------------------------------------------------------------------------
 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 GSMInitDecode(void **state_data,
                     Word8 * id)
{
    Speech_Decode_FrameState* s;
    OSCL_UNUSED_ARG(id);

    if (state_data == NULL)
    {
        /*  fprintf(stderr, "Speech_Decode_Frame_init:
                             invalid parameter\n");  */
        return (-1);
    }
    *state_data = NULL;

    /* allocate memory */
    if ((s = (Speech_Decode_FrameState *)
             malloc(sizeof(Speech_Decode_FrameState))) == NULL)
    {
        /*  fprintf(stderr, "Speech_Decode_Frame_init: can not malloc state "
            "structure\n");  */
        return (-1);
    }

    if (Decoder_amr_init(&s->decoder_amrState)
            || Post_Process_reset(&s->postHP_state))
    {
        Speech_Decode_FrameState *tmp = s;
        /*
         *  dereferencing type-punned pointer avoid
         *  breaking strict-aliasing rules
         */
        void** tempVoid = (void**) tmp;
        GSMDecodeFrameExit(tempVoid);
        return (-1);
    }


    Speech_Decode_Frame_reset(s);
    *state_data = (void *)s;

    return (0);
}


/****************************************************************************/


/*
------------------------------------------------------------------------------
 FUNCTION NAME: Speech_Decode_Frame_reset
------------------------------------------------------------------------------
 INPUT AND OUTPUT DEFINITIONS

 Inputs:
    state = pointer to structures of type Speech_Decode_FrameState

 Outputs:
    None

 Returns:
    return_value = set to zero if reset was successful; -1, otherwise (int)

 Global Variables Used:
    None

 Local Variables Needed:
    None

------------------------------------------------------------------------------
 FUNCTION DESCRIPTION

 This function resets the state memory used by the GSM AMR decoder.

------------------------------------------------------------------------------
 REQUIREMENTS

 None

------------------------------------------------------------------------------
 REFERENCES

 sp_dec.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001

------------------------------------------------------------------------------
 PSEUDO-CODE

int Speech_Decode_Frame_reset (Speech_Decode_FrameState *state)
{
  if (state == (Speech_Decode_FrameState *) NULL){
      fprintf(stderr, "Speech_Decode_Frame_reset: invalid parameter\n");
      return -1;
  }

  Decoder_amr_reset(state->decoder_amrState, (enum Mode)0);
  Post_Filter_reset(state->post_state);
  Post_Process_reset(state->postHP_state);

  state->prev_mode = (enum Mode)0;

  setCounter(state->complexityCounter);
  Init_WMOPS_counter();
  setCounter(0); // set counter to global counter

  return 0;
}

------------------------------------------------------------------------------
 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 Speech_Decode_Frame_reset(void *state_data)
{

    Speech_Decode_FrameState *state =
        (Speech_Decode_FrameState *) state_data;

    if (state_data ==  NULL)
    {
        /*  fprintf(stderr, "Speech_Decode_Frame_reset:
                             invalid parameter\n");  */
        return (-1);
    }

    Decoder_amr_reset(&(state->decoder_amrState), MR475);
    Post_Filter_reset(&(state->post_state));
    Post_Process_reset(&(state->postHP_state));

    state->prev_mode = MR475;

    return (0);
}

/****************************************************************************/

/*
------------------------------------------------------------------------------
 FUNCTION NAME: GSMDecodeFrameExit
------------------------------------------------------------------------------
 INPUT AND OUTPUT DEFINITIONS

 Inputs:
    state = pointer to an array of pointers to structures of type
            Speech_Decode_FrameState

 Outputs:
    state contents is set to NULL

 Returns:
    None

 Global Variables Used:
    None

 Local Variables Needed:
    None

------------------------------------------------------------------------------
 FUNCTION DESCRIPTION

 This function frees up the memory used for the state memory of the GSM AMR
 decoder.

------------------------------------------------------------------------------
 REQUIREMENTS

 None

------------------------------------------------------------------------------
 REFERENCES

 sp_dec.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001

------------------------------------------------------------------------------
 PSEUDO-CODE

 Note: The original function name of Speech_Decode_Frame_exit was changed to
       GSMDecodeFrameExit in the Code section.

void Speech_Decode_Frame_exit (Speech_Decode_FrameState **state)
{
  if (state == NULL || *state == NULL)
      return;

  Decoder_amr_exit(&(*state)->decoder_amrState);
  Post_Filter_exit(&(*state)->post_state);
  Post_Process_exit(&(*state)->postHP_state);

  setCounter((*state)->complexityCounter);
  WMOPS_output(0);
  setCounter(0); // set counter to global counter

  // deallocate memory
  free(*state);
  *state = NULL;

  return;
}

------------------------------------------------------------------------------
 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 GSMDecodeFrameExit(void **state_data)
{

    Speech_Decode_FrameState **state =
        (Speech_Decode_FrameState **) state_data;

    if (state == NULL || *state == NULL)
    {
        return;
    }

    /* deallocate memory */
    free(*state);
    *state = NULL;

    return;
}

/****************************************************************************/

/*
------------------------------------------------------------------------------
 FUNCTION NAME: GSMFrameDecode
------------------------------------------------------------------------------
 INPUT AND OUTPUT DEFINITIONS

 Inputs:
    st = pointer to structures of type Speech_Decode_FrameState
    mode = GSM AMR codec mode (enum Mode)
    serial = pointer to the serial bit stream buffer (unsigned char)
    frame_type = GSM AMR receive frame type (enum RXFrameType)
    synth = pointer to the output synthesis speech buffer (Word16)

 Outputs:
    synth contents are truncated to 13 bits if NO13BIT is not defined,
      otherwise, its contents are left at 16 bits

 Returns:
    return_value = set to zero (int)

 Global Variables Used:
    None

 Local Variables Needed:
    None

------------------------------------------------------------------------------
 FUNCTION DESCRIPTION

 This function is the entry point to the GSM AMR decoder. The following
 operations are performed on one received frame: First, the codec
 parameters are parsed from the buffer pointed to by serial according to
 frame_type. Then the AMR decoder is invoked via a call to Decoder_amr. Post
 filtering of the decoded data is done via a call to Post_Filter function.
 Lastly, the decoded data is post-processed via a call to Post_Process
 function. If NO13BIT is not defined, the contents of the buffer pointed to
 by synth is truncated to 13 bits. It remains unchanged otherwise.

------------------------------------------------------------------------------
 REQUIREMENTS

 None

------------------------------------------------------------------------------
 REFERENCES

 sp_dec.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001

------------------------------------------------------------------------------
 PSEUDO-CODE

 Note: The original function name of Speech_Decode_Frame_exit was changed to
       GSMFrameDecode in the Code section.

int Speech_Decode_Frame (
    Speech_Decode_FrameState *st, // io: post filter states
    enum Mode mode,               // i : AMR mode
    Word16 *serial,               // i : serial bit stream
    enum RXFrameType frame_type,  // i : Frame type
    Word16 *synth                 // o : synthesis speech (postfiltered
                                  //     output)
)
{
  Word16 parm[MAX_PRM_SIZE + 1];  // Synthesis parameters
  Word16 Az_dec[AZ_SIZE];         // Decoded Az for post-filter
                                  // in 4 subframes

#if !defined(NO13BIT)
  Word16 i;
#endif

  setCounter(st->complexityCounter);
  Reset_WMOPS_counter ();          // reset WMOPS counter for the new frame

  // Serial to parameters
  if ((frame_type == RX_SID_BAD) ||
      (frame_type == RX_SID_UPDATE)) {
    // Override mode to MRDTX
    Bits2prm (MRDTX, serial, parm);
  } else {
    Bits2prm (mode, serial, parm);
  }

  // Synthesis
  Decoder_amr(st->decoder_amrState, mode, parm, frame_type,
              synth, Az_dec);

  Post_Filter(st->post_state, mode, synth, Az_dec);   // Post-filter

  // post HP filter, and 15->16 bits
  Post_Process(st->postHP_state, synth, L_FRAME);

#if !defined(NO13BIT)
  // Truncate to 13 bits
  for (i = 0; i < L_FRAME; i++)
  {
     synth[i] = synth[i] & 0xfff8;
  }
#endif

  setCounter(0); // set counter to global counter

  return 0;
}


------------------------------------------------------------------------------
 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 GSMFrameDecode(
    Speech_Decode_FrameState *st, /* io: post filter states                */
    enum Mode mode,               /* i : AMR mode                          */
    Word16 *serial,               /* i : serial bit stream                 */
    enum RXFrameType frame_type,  /* i : Frame type                        */
    Word16 *synth)                /* o : synthesis speech (postfiltered    */
/*     output)                           */

{
    Word16 parm[MAX_PRM_SIZE + 1];  /* Synthesis parameters                */
    Word16 Az_dec[AZ_SIZE];         /* Decoded Az for post-filter          */
    /* in 4 subframes                      */
    Flag *pOverflow = &(st->decoder_amrState.overflow);  /* Overflow flag  */

#if !defined(NO13BIT)
    Word16 i;
#endif

    /* Serial to parameters   */
    if ((frame_type == RX_SID_BAD) ||
            (frame_type == RX_SID_UPDATE))
    {
        /* Override mode to MRDTX */
        Bits2prm(MRDTX, serial, parm);
    }
    else
    {
        Bits2prm(mode, serial, parm);
    }

    /* Synthesis */
    Decoder_amr(
        &(st->decoder_amrState),
        mode,
        parm,
        frame_type,
        synth,
        Az_dec);

    /* Post-filter */
    Post_Filter(
        &(st->post_state),
        mode,
        synth,
        Az_dec,
        pOverflow);

    /* post HP filter, and 15->16 bits */
    Post_Process(
        &(st->postHP_state),
        synth,
        L_FRAME,
        pOverflow);

#if !defined(NO13BIT)
    /* Truncate to 13 bits */
    for (i = 0; i < L_FRAME; i++)
    {
        synth[i] = synth[i] & 0xfff8;
    }
#endif

    return;
}