--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/cs/layer1/audio_cfile/l1audio_back.c	Mon Mar 20 00:51:20 2017 +0000
@@ -0,0 +1,609 @@
+/************* Revision Controle System Header *************
+ *                  GSM Layer 1 software
+ * L1AUDIO_SRBACK.C
+ *
+ *        Filename l1audio_back.c
+ *  Copyright 2003 (C) Texas Instruments  
+ *
+ ************* Revision Controle System Header *************/
+
+/************************************/
+/* Include files...                 */
+/************************************/
+
+#define L1_SRBACK_COM // switch to define the l1_srback_com variable
+#define L1_AUDIOBACK_MELODYE2 // switch to define the audio background variable
+
+#include "l1_macro.h"
+#include "l1_confg.h"
+
+#if (AUDIO_TASK == 1) && (L1_AUDIO_BACKGROUND_TASK)
+
+  #include "l1_types.h"
+  #include "sys_types.h"
+
+  #if (CODE_VERSION == SIMULATION) && (AUDIO_SIMULATION)
+
+
+    #include <stdlib.h>
+    #include <string.h>
+
+    #include "iq.h"             // Debug / Init hardware  ("eva3.lib")
+    #include "l1_ver.h"
+    #include "l1_const.h"
+    #include "l1_signa.h"
+
+    #if TESTMODE
+      #include "l1tm_defty.h"
+    #endif
+
+    #include "l1audio_const.h"
+    #include "l1audio_cust.h"
+    #include "l1audio_signa.h"
+    #include "l1audio_defty.h"
+    #include "l1audio_msgty.h"
+    #include "l1audio_varex.h"
+
+    #if (L1_GTT == 1)
+      #include "l1gtt_const.h"
+      #include "l1gtt_defty.h"
+    #endif
+//added form e-sample for AAC
+    #if (L1_DYN_DSP_DWNLD == 1)
+      #include "l1_dyn_dwl_const.h"
+      #include "l1_dyn_dwl_defty.h"
+    #endif
+    #if (L1_MP3 == 1)
+      #include "l1mp3_defty.h"
+    #endif
+
+    #if (L1_MIDI == 1)
+      #include "l1midi_defty.h"
+    #endif
+//added form e-sample for AAC
+    #if (L1_AAC == 1)
+      #include "l1aac_defty.h"
+    #endif
+
+    #include "l1_defty.h"
+    #include "cust_os.h"
+    #include "l1_msgty.h"
+    #include "l1_varex.h"
+
+    #include "l1_mftab.h"
+    #include "l1_tabs.h"
+    #include "l1_ctl.h"
+
+
+    #include "l1_time.h"
+    #include "l1_scen.h"
+
+  #else
+  // Layer1 and debug include files.
+
+    #include <ctype.h>
+    #include <math.h>
+    #include "l1_ver.h"
+    #include "l1_const.h"
+    #include "l1_signa.h"
+
+    #if TESTMODE
+      #include "l1tm_defty.h"
+    #endif
+
+    #include "l1audio_const.h"
+    #include "l1audio_cust.h"
+    #include "l1audio_signa.h"
+    #include "l1audio_defty.h"
+    #include "l1audio_msgty.h"
+    #include "l1audio_varex.h"
+
+    #if (L1_GTT == 1)
+      #include "l1gtt_const.h"
+      #include "l1gtt_defty.h"
+    #endif
+//added form e-sample for AAC
+    #if (L1_DYN_DSP_DWNLD == 1)
+      #include "l1_dyn_dwl_const.h"
+      #include "l1_dyn_dwl_defty.h"
+    #endif
+    #if (L1_MP3 == 1)
+      #include "l1mp3_defty.h"
+    #endif
+
+    #if (L1_MIDI == 1)
+      #include "l1midi_defty.h"
+    #endif
+//added form e-sample for AAC
+    #if (L1_AAC == 1)
+      #include "l1aac_defty.h"
+    #endif
+
+    #include "l1_defty.h"
+    #include "cust_os.h"
+    #include "l1_msgty.h"
+    #include "tpudrv.h"       // TPU drivers.           ("eva3.lib")
+    #include "l1_varex.h"
+
+    #include "l1_proto.h"
+    #include "l1_mftab.h"
+    #include "l1_tabs.h"
+    #include "mem.h"
+    #include "armio.h"
+    #include "timer.h"
+    #include "timer1.h"
+    #include "dma.h"
+    #include "inth.h"
+    #include "ulpd.h"
+    #include "rhea_arm.h"
+    #include "clkm.h"         // Clockm  ("eva3.lib")
+    #include "l1_ctl.h"
+
+    #include "l1_time.h"
+    #if L2_L3_SIMUL
+      #include "l1_scen.h"
+    #endif
+  #endif
+
+  /****************************************/
+  /* Prototypes for audio background task */
+  /****************************************/
+  void l1_audio_background_task       (UWORD32 argc, void *argv);
+  #if (SPEECH_RECO)
+  void srback_CTO_algorithm         (API *RAM_address);
+  void srback_save_model_temp       (API *RAM_address_input, UWORD16 *RAM_address_output);
+  #endif
+  #if (MELODY_E2 && FIR)
+    void audio_background_melody_e2_download_instrument_manager(xSignalHeaderRec *msg);
+  #endif
+  /**************************************/
+  /* External prototypes                */
+  /**************************************/
+  #if (SPEECH_RECO)
+  extern void Cust_srback_save_model     (UWORD8 database, UWORD8 index, API *RAM_address);
+  extern void Cust_srback_save_speech    (UWORD8 database, UWORD8 index, UWORD16 *start_buffer, UWORD16 *stop_buffer, UWORD16 *start_speech, UWORD16 *stop_speech);
+  extern void Cust_srback_load_model     (UWORD8 database, UWORD8 index, API *RAM_address);
+  #endif
+  #if (MELODY_E2 && FIR)
+    extern UWORD16 Cust_audio_melody_E2_load_instrument (UWORD8 customer_instrument_id,
+                                                         API *API_address,
+                                                         UWORD16 allowed_size);
+  #endif
+
+#if (OP_RIV_AUDIO == 0)
+  /*--------------------------------------------------------*/
+  /* l1_audio_background_task()                             */
+  /*--------------------------------------------------------*/
+  /*                                                        */
+  /* Description:                                           */
+  /* ------------                                           */
+  /* This function is a state machine which handles the     */
+  /* audio background feature.                              */
+  /*                                                        */
+  /* Starting messages:        L1_SRBACK_SAVE_DATA_REQ      */
+  /*                           L1_SRBACK_TEMP_SAVE_DATA_REQ */
+  /*                           L1_SRBACK_LOAD_MODEL_REQ     */
+  /*                L1_BACK_MELODY_E2_LOAD_INSTRUMENT_REQ   */
+  /*                L1_BACK_MELODY_E2_UNLOAD_INSTRUMENT_REQ */
+  /*                                                        */
+  /* Result messages (input):  none                         */
+  /*                                                        */
+  /* Result messages (output): L1_SRBACK_SAVE_DATA_CON      */
+  /*                           L1_SRBACK_TEMP_SAVE_DATA_CON */
+  /*                           L1_SRBACK_LOAD_MODEL_CON     */
+  /*                L1_BACK_MELODY_E2_LOAD_INSTRUMENT_CON   */
+  /*                L1_BACK_MELODY_E2_UNLOAD_INSTRUMENT_CON */
+  /*                                                        */
+  /* Reset messages (input):   none                         */
+  /*                                                        */
+  /* Stop message (input):     non                          */
+  /*                                                        */
+  /* Stop message (output):    L1_SRBACK_SAVE_DATA_CON      */
+  /*                           L1_SRBACK_TEMP_SAVE_DATA_CON */
+  /*                           L1_SRBACK_LOAD_MODEL_CON     */
+  /*                L1_BACK_MELODY_E2_LOAD_INSTRUMENT_CON   */
+  /*                L1_BACK_MELODY_E2_UNLOAD_INSTRUMENT_CON */
+  /*                                                        */
+  /* Rem: to stop immeditly the speech reco feature a flag  */
+  /* ---- is created: l1_srback_com.emergency_stop          */
+  /*                                                        */
+  /*--------------------------------------------------------*/
+  void l1_audio_background_task(UWORD32 argc, void *argv)
+  {
+    xSignalHeaderRec *receive_msg, *confirm_msg;
+    UWORD8  index;
+
+    while(1)
+    {
+      // Wait until a message is receive
+      receive_msg = os_receive_sig(SRBACK_QUEUE);
+
+      #if (SPEECH_RECO)
+        if (receive_msg->SignalCode == L1_SRBACK_SAVE_DATA_REQ)
+        {
+          if (l1_srback_com.emergency_stop == FALSE)
+          {
+            // Call the customer function to save the model
+            Cust_srback_save_model( ((T_L1_SRBACK_SAVE_DATA_REQ *)(receive_msg->SigP))->database_id,
+                                    ((T_L1_SRBACK_SAVE_DATA_REQ *)(receive_msg->SigP))->model_index,
+                                    ((T_L1_SRBACK_SAVE_DATA_REQ *)(receive_msg->SigP))->model_RAM_address );
+          }
+          if ( ((T_L1_SRBACK_SAVE_DATA_REQ *)(receive_msg->SigP))->speech )
+          {
+            if (l1_srback_com.emergency_stop == FALSE)
+            {
+              // Call the customer function to save the speech from a circular buffer to the database
+              Cust_srback_save_speech( ((T_L1_SRBACK_SAVE_DATA_REQ *)(receive_msg->SigP))->database_id,
+                                       ((T_L1_SRBACK_SAVE_DATA_REQ *)(receive_msg->SigP))->model_index,
+                                       ((T_L1_SRBACK_SAVE_DATA_REQ *)(receive_msg->SigP))->start_buffer,
+                                       ((T_L1_SRBACK_SAVE_DATA_REQ *)(receive_msg->SigP))->stop_buffer,
+                                       ((T_L1_SRBACK_SAVE_DATA_REQ *)(receive_msg->SigP))->start_address,
+                                       ((T_L1_SRBACK_SAVE_DATA_REQ *)(receive_msg->SigP))->stop_address);
+            }
+          }
+
+          // Send the stop confirmation message
+          confirm_msg = os_alloc_sig(0);
+          DEBUGMSG(status,NU_ALLOC_ERR)
+          confirm_msg->SignalCode = L1_SRBACK_SAVE_DATA_CON;
+          os_send_sig(confirm_msg, L1C1_QUEUE);
+          DEBUGMSG(status,NU_SEND_QUEUE_ERR)
+        } // L1_SRBACK_SAVE_DATA_REQ
+        else
+        if (receive_msg->SignalCode == L1_SRBACK_LOAD_MODEL_REQ)
+        {
+          if ( ( ((T_L1_SRBACK_LOAD_MODEL_REQ *)(receive_msg->SigP))->CTO_enable ) == FALSE )
+          {
+            if (l1_srback_com.emergency_stop == FALSE)
+            {
+              // Call the function to load a model
+              Cust_srback_load_model( ((T_L1_SRBACK_LOAD_MODEL_REQ *)(receive_msg->SigP))->database_id,
+                                      ((T_L1_SRBACK_LOAD_MODEL_REQ *)(receive_msg->SigP))->model_index,
+                                      ((T_L1_SRBACK_LOAD_MODEL_REQ *)(receive_msg->SigP))->model_RAM_address );
+            }
+          }
+          else
+          {
+            if (l1_srback_com.emergency_stop == FALSE)
+            {
+              // Calculate the good index
+              index = ((T_L1_SRBACK_LOAD_MODEL_REQ *)(receive_msg->SigP))->model_index>>1;
+
+              // Call the function to load a model with the good index
+              Cust_srback_load_model( ((T_L1_SRBACK_LOAD_MODEL_REQ *)(receive_msg->SigP))->database_id,
+                                      index,
+                                      ((T_L1_SRBACK_LOAD_MODEL_REQ *)(receive_msg->SigP))->model_RAM_address );
+            }
+
+            // The CTO algorithm is used and the model index is odd
+            if ( ((T_L1_SRBACK_LOAD_MODEL_REQ *)(receive_msg->SigP))->model_index & 0x01 )
+            {
+              if (l1_srback_com.emergency_stop == FALSE)
+              {
+                // Call the function to apply the CTO algorithm to the loaded model
+                srback_CTO_algorithm( ((T_L1_SRBACK_LOAD_MODEL_REQ *)(receive_msg->SigP))->model_RAM_address );
+              }
+            }
+          }
+
+          // Send the stop confirmation message
+          confirm_msg = os_alloc_sig(0);
+          DEBUGMSG(status,NU_ALLOC_ERR)
+          confirm_msg->SignalCode = L1_SRBACK_LOAD_MODEL_CON;
+          os_send_sig(confirm_msg, L1C1_QUEUE);
+          DEBUGMSG(status,NU_SEND_QUEUE_ERR)
+        } // L1_SRBACK_LOAD_MODEL_REQ
+        else
+        if (receive_msg->SignalCode == L1_SRBACK_TEMP_SAVE_DATA_REQ)
+        {
+          if (l1_srback_com.emergency_stop == FALSE)
+          {
+            // Call the function to save the model in a temporary buffer
+            srback_save_model_temp( ((T_L1_SRBACK_TEMP_SAVE_DATA_REQ *)(receive_msg->SigP))->model_RAM_address_input,
+                                    ((T_L1_SRBACK_TEMP_SAVE_DATA_REQ *)(receive_msg->SigP))->model_RAM_address_output );
+          }
+
+          // Send the stop confirmation message
+          confirm_msg = os_alloc_sig(0);
+          DEBUGMSG(status,NU_ALLOC_ERR)
+          confirm_msg->SignalCode = L1_SRBACK_TEMP_SAVE_DATA_CON;
+          os_send_sig(confirm_msg, L1C1_QUEUE);
+          DEBUGMSG(status,NU_SEND_QUEUE_ERR)
+        } // L1_SRBACK_TEMP_SAVE_DATA_REQ
+      #endif // SPEECH_RECO
+      #if (MELODY_E2 && FIR)
+        if ( (receive_msg->SignalCode == L1_BACK_MELODY_E2_LOAD_INSTRUMENT_REQ) ||
+             (receive_msg->SignalCode == L1_BACK_MELODY_E2_UNLOAD_INSTRUMENT_REQ) )
+        {
+          audio_background_melody_e2_download_instrument_manager(receive_msg);
+        } // L1_BACK_MELODY_E2_LOAD_INSTRUMENT_REQ
+      #endif // MELODY_E2
+
+      // Deallocate the received message
+      os_free_sig(receive_msg);
+      DEBUGMSG(status,NU_ALLOC_ERR)
+    } // while(1)
+  }
+#endif // OP_RIV_AUDIO
+
+  #if (SPEECH_RECO)
+    /*-------------------------------------------------------*/
+    /* srback_CTO_algorithm()                                */
+    /*-------------------------------------------------------*/
+    /*                                                       */
+    /* Parameters : RAM_address                              */
+    /*                                                       */
+    /* Return     : none                                     */
+    /*                                                       */
+    /* Description : apply the CTO algorithm to the model.   */
+    /*                                                       */
+    /*-------------------------------------------------------*/
+    void srback_CTO_algorithm (API *RAM_address)
+    {
+      UWORD16 model_size, frame;
+      UWORD8  frame_size;
+
+      // This alogrithm changes the model:
+      // |frame 0|frame 1|frame 2|frame 3|frame 4|frame 5|frame 6|frame 7|...
+      // into a garbage model:
+      // |0000000|frame 1|0000000|0000000|frame 4|0000000|0000000|frame 7|...
+
+      // look the size of the model in model frame unit (16 words unit)
+      model_size = *RAM_address++;
+
+      frame = 0;
+
+      while( (frame <= model_size) &&
+             (l1_srback_com.emergency_stop == FALSE) )
+      {
+        if ((frame % 3) == 1)
+        {
+          // This frame is kept
+          RAM_address += SC_SR_MODEL_FRAME_SIZE;
+        }
+        else
+        {
+          // This frame is set to 0
+          frame_size = SC_SR_MODEL_FRAME_SIZE;
+          while ( (frame_size != 0) &&
+                  (l1_srback_com.emergency_stop == FALSE) )
+          {
+            *RAM_address++ = 0;
+            frame_size--;
+          }
+        }
+
+        frame++;
+      }
+    }
+
+    /*-------------------------------------------------------*/
+    /* srback_CTO_algorithm()                                */
+    /*-------------------------------------------------------*/
+    /*                                                       */
+    /* Parameters : RAM_address_input                        */
+    /*              RAM_address_output                       */
+    /*                                                       */
+    /* Return     : none                                     */
+    /*                                                       */
+    /* Description : apply the CTO algorithm to the model.   */
+    /*                                                       */
+    /*-------------------------------------------------------*/
+    void srback_save_model_temp (API *RAM_address_input, UWORD16 *RAM_address_output)
+    {
+      UWORD16 model_size;
+      UWORD8  frame_size;
+
+      // look the size of the model in model frame unit (16 words unit)
+      model_size = *RAM_address_input;
+
+      // save the header of the model
+      *RAM_address_output++ = *RAM_address_input++;
+
+      while( (model_size != 0) &&
+             (l1_srback_com.emergency_stop == FALSE) )
+      {
+        frame_size = SC_SR_MODEL_FRAME_SIZE;
+        while ( (frame_size != 0) &&
+                (l1_srback_com.emergency_stop == FALSE) )
+        {
+          *RAM_address_output++ = *RAM_address_input++;
+          frame_size--;
+        }
+        model_size--;
+      }
+    }
+  #endif // SPEECH_RECO
+
+#if (OP_RIV_AUDIO == 0)
+  #if (MELODY_E2 && FIR)
+    /*--------------------------------------------------------*/
+    /*audio_background_melody_e2_download_instrument_manager()*/
+    /*--------------------------------------------------------*/
+    /*                                                        */
+    /* Description:                                           */
+    /* ------------                                           */
+    /* This function is used to load/unload the instrument of */
+    /* the melodies E2.                                       */
+    /*                                                        */
+    /* Starting messages:                                     */
+    /*                L1_BACK_MELODY_E2_LOAD_INSTRUMENT_REQ   */
+    /*                L1_BACK_MELODY_E2_UNLOAD_INSTRUMENT_REQ */
+    /*                                                        */
+    /* Result messages (input):  none                         */
+    /*                                                        */
+    /* Result messages (output):                              */
+    /*                L1_BACK_MELODY_E2_LOAD_INSTRUMENT_CON   */
+    /*                L1_BACK_MELODY_E2_UNLOAD_INSTRUMENT_CON */
+    /*                                                        */
+    /* Reset messages (input):   none                         */
+    /*                                                        */
+    /* Stop message (input):     none.                        */
+    /*                                                        */
+    /* Stop message (output):                                 */
+    /*                L1_BACK_MELODY_E2_LOAD_INSTRUMENT_CON   */
+    /*                L1_BACK_MELODY_E2_UNLOAD_INSTRUMENT_CON */
+    /*                                                        */
+    /* Rem: to stop immediatly the instrument download flags  */
+    /* ---- is created:                                       */
+    /* l1a_l1s_com.melody0_e2_task.parameters.emergency_stop  */
+    /* l1a_l1s_com.melody1_e2_task.parameters.emergency_stop  */
+    /*                                                        */
+    /*--------------------------------------------------------*/
+    void audio_background_melody_e2_download_instrument_manager(xSignalHeaderRec *msg)
+    {
+      xSignalHeaderRec  *confirm_msg;
+      UWORD8            instrument_number, max_number_of_instrument, instrument_id, id;
+      UWORD16           size;
+      UWORD32           address;
+
+      if (msg->SignalCode == L1_BACK_MELODY_E2_LOAD_INSTRUMENT_REQ)
+      {
+        // Load the instrument
+
+        // Init the first address
+        address = ( ((UWORD32)(l1s_dsp_com.dsp_ndb_ptr->a_melody_e2_instrument_wave))
+          - SC_AUDIO_MCU_API_BEGIN_ADDRESS );
+        l1s_dsp_com.dsp_ndb_ptr->a_melody_e2_instrument_ptr[0] =
+            (API)( (address>>1) + SC_AUDIO_DSP_API_BEGIN_ADDRESS );
+
+        // Download the instrument
+        max_number_of_instrument = ((T_L1_BACK_MELODY_E2_LOAD_INSTRUMENT_REQ *)(msg->SigP))->number_of_instrument;
+        for(instrument_number=0; instrument_number < max_number_of_instrument ; instrument_number++)
+        {
+          // No instrument was previously download
+          if (audioback_melody_e2.number_of_user[instrument_number] == 0)
+          {
+            // load the insturment ID
+            instrument_id =
+              ((T_L1_BACK_MELODY_E2_LOAD_INSTRUMENT_REQ *)(msg->SigP))->waves_table_id[instrument_number];
+
+            // Find if this instrument was already downloaded
+            id = 0;
+            while ( (id < SC_AUDIO_MELODY_E2_MAX_NUMBER_OF_INSTRUMENT) &&
+                    ((instrument_id != audioback_melody_e2.instrument_id[id]) ||
+                     (audioback_melody_e2.number_of_user[id] == 0)) )
+            {
+              id++;
+            }
+
+            if (id < SC_AUDIO_MELODY_E2_MAX_NUMBER_OF_INSTRUMENT)
+            {
+              // This insturment was already downloaded
+              // copy the address of this instrument
+              l1s_dsp_com.dsp_ndb_ptr->a_melody_e2_instrument_ptr[instrument_number] =
+                l1s_dsp_com.dsp_ndb_ptr->a_melody_e2_instrument_ptr[id];
+
+              // The size of this instrument is 0
+              audioback_melody_e2.instrument_size[instrument_number] = 0;
+            }
+            else
+            {
+                // Load the customer instrument
+              size = Cust_audio_melody_E2_load_instrument (
+                      ((T_L1_BACK_MELODY_E2_LOAD_INSTRUMENT_REQ *)(msg->SigP))->waves_table_id[instrument_number],
+                      audioback_melody_e2.API_address,
+                      audioback_melody_e2.allowed_size);
+
+              // Added to stop the L1 in case of download error
+              if (size == 0)
+              {
+                // Send a message to stop the L1
+                /* send the stop command to the audio L1 */
+                /* allocate the buffer for the message to the L1 */
+                confirm_msg = os_alloc_sig(0);
+                DEBUGMSG(status,NU_ALLOC_ERR)
+
+                if (confirm_msg != NULL)
+                {
+                  /* send the stop command to the audio L1 */
+                  if ( ((T_L1_BACK_MELODY_E2_LOAD_INSTRUMENT_REQ *)(confirm_msg->SigP))->melody_id == 0)
+                  {
+                    confirm_msg->SignalCode = MMI_MELODY0_E2_STOP_REQ;
+                  }
+                  else
+                  {
+                    confirm_msg->SignalCode = MMI_MELODY1_E2_STOP_REQ;
+                  }
+                  os_send_sig(confirm_msg, L1C1_QUEUE);
+                  DEBUGMSG(status,NU_SEND_QUEUE_ERR)
+                }
+              }
+
+              // Save the size of this instrument
+              audioback_melody_e2.instrument_size[instrument_number] = size;
+            }
+
+            // Update the Cust_audio_melody_E2_load_instrument argument
+            audioback_melody_e2.API_address   += audioback_melody_e2.instrument_size[instrument_number];
+            audioback_melody_e2.allowed_size  -= audioback_melody_e2.instrument_size[instrument_number];
+
+            // Put the DSP address to the NDB API for the next instrument
+            if (instrument_number < SC_AUDIO_MELODY_E2_MAX_NUMBER_OF_INSTRUMENT-1)
+            {
+              address = ( ((UWORD32)(audioback_melody_e2.API_address))
+                - SC_AUDIO_MCU_API_BEGIN_ADDRESS );
+
+              l1s_dsp_com.dsp_ndb_ptr->a_melody_e2_instrument_ptr[instrument_number + 1] =
+                  (API)( (address>>1) + SC_AUDIO_DSP_API_BEGIN_ADDRESS );
+            }
+
+            // Save the instrument ID
+            audioback_melody_e2.instrument_id[instrument_number] = instrument_id;
+          }
+
+          // Increase the number of user of this instrument number
+          audioback_melody_e2.number_of_user[instrument_number]++;
+        }
+
+        // Send the load confirmation message
+        confirm_msg = os_alloc_sig(sizeof(T_L1_BACK_MELODY_E2_LOAD_INSTRUMENT_CON));
+        DEBUGMSG(status,NU_ALLOC_ERR)
+
+        // Fill the parameter
+        ((T_L1_BACK_MELODY_E2_LOAD_INSTRUMENT_CON *)(confirm_msg->SigP))->melody_id =
+          ((T_L1_BACK_MELODY_E2_LOAD_INSTRUMENT_REQ *)(msg->SigP))->melody_id;
+
+        confirm_msg->SignalCode = L1_BACK_MELODY_E2_LOAD_INSTRUMENT_CON;
+
+        os_send_sig(confirm_msg, L1C1_QUEUE);
+        DEBUGMSG(status,NU_SEND_QUEUE_ERR)
+      }
+      else
+      if (msg->SignalCode == L1_BACK_MELODY_E2_UNLOAD_INSTRUMENT_REQ)
+      {
+        // Unload the instrument
+        max_number_of_instrument = ((T_L1_BACK_MELODY_E2_UNLOAD_INSTRUMENT_REQ *)(msg->SigP))->number_of_instrument;
+        for(instrument_number = max_number_of_instrument; instrument_number > 0 ; instrument_number--)
+        {
+          // Decrease the number of user of this instrument number
+          audioback_melody_e2.number_of_user[instrument_number-1]--;
+
+          // Check if the instrument must be removed
+          if (audioback_melody_e2.number_of_user[instrument_number-1] == 0)
+          {
+            // Increase the size and decrease the pointer to the API with the size
+            // of the removed instrument
+            // Update the Cust_audio_melody_E2_load_instrument argument
+            audioback_melody_e2.API_address   -= audioback_melody_e2.instrument_size[instrument_number-1];
+            audioback_melody_e2.allowed_size  += audioback_melody_e2.instrument_size[instrument_number-1];
+          }
+        }
+
+        // Send the unload confirmation message
+        confirm_msg = os_alloc_sig(sizeof(T_L1_BACK_MELODY_E2_UNLOAD_INSTRUMENT_CON));
+        DEBUGMSG(status,NU_ALLOC_ERR)
+
+        // Fill the paramter
+        ((T_L1_BACK_MELODY_E2_UNLOAD_INSTRUMENT_CON *)(confirm_msg->SigP))->melody_id =
+          ((T_L1_BACK_MELODY_E2_UNLOAD_INSTRUMENT_REQ *)(msg->SigP))->melody_id;
+
+        confirm_msg->SignalCode = L1_BACK_MELODY_E2_UNLOAD_INSTRUMENT_CON;
+
+        os_send_sig(confirm_msg, L1C1_QUEUE);
+        DEBUGMSG(status,NU_SEND_QUEUE_ERR)
+      }
+    }
+  #endif // MELODY_E2
+#endif // OP_RIV_AUDIO
+#endif // AUDIO_TASK == 1 && L1_AUDIO_BACKGROUND_TASK