text: /***********************************************************************
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  modification, (subject to the limitations in the disclaimer below) 
  are permitted provided that the following conditions are met:
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  this list of conditions and the following disclaimer.
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  notice, this list of conditions and the following disclaimer in the 
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  contributors, may be used to endorse or promote products derived from 
  this software without specific prior written permission.
  NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE GRANTED 
  BY THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 
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  FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 
  COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 
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  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 
  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  ***********************************************************************/
  
  
  /*****************************/
  /* Silk decoder test program */
  /*****************************/
  
  #ifdef _WIN32
  #define _CRT_SECURE_NO_DEPRECATE    1
  #endif
  
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include "SKP_Silk_SDK_API.h"
  #include "SKP_Silk_SigProc_FIX.h"
  
  /* Define codec specific settings should be moved to h file */
  #define MAX_BYTES_PER_FRAME     1024
  #define MAX_INPUT_FRAMES        5
  #define MAX_FRAME_LENGTH        480
  #define FRAME_LENGTH_MS         20
  #define MAX_API_FS_KHZ          48
  #define MAX_LBRR_DELAY          2
  
  #ifdef _SYSTEM_IS_BIG_ENDIAN
  /* Function to convert a little endian int16 to a */
  /* big endian int16 or vica verca                 */
  void swap_endian(
      SKP_int16       vec[],
      SKP_int         len
  )
  {
      SKP_int i;
      SKP_int16 tmp;
      SKP_uint8 *p1, *p2;
  
      for( i = 0; i < len; i++ ){
          tmp = vec[ i ];
          p1 = (SKP_uint8 *)&vec[ i ]; p2 = (SKP_uint8 *)&tmp;
          p1[ 0 ] = p2[ 1 ]; p1[ 1 ] = p2[ 0 ];
      }
  }
  #endif
  
  #if (defined(_WIN32) || defined(_WINCE)) 
  #include <windows.h>	/* timer */
  #else    // Linux or Mac
  #include <sys/time.h>
  #endif
  
  #ifdef _WIN32
  
  unsigned long GetHighResolutionTime() /* O: time in usec*/
  {
      /* Returns a time counter in microsec	*/
      /* the resolution is platform dependent */
      /* but is typically 1.62 us resolution  */
      LARGE_INTEGER lpPerformanceCount;
      LARGE_INTEGER lpFrequency;
      QueryPerformanceCounter(&lpPerformanceCount);
      QueryPerformanceFrequency(&lpFrequency);
      return (unsigned long)((1000000*(lpPerformanceCount.QuadPart)) / lpFrequency.QuadPart);
  }
  #else    // Linux or Mac
  unsigned long GetHighResolutionTime() /* O: time in usec*/
  {
      struct timeval tv;
      gettimeofday(&tv, 0);
      return((tv.tv_sec*1000000)+(tv.tv_usec));
  }
  #endif // _WIN32
  
  /* Seed for the random number generator, which is used for simulating packet loss */
  static SKP_int32 rand_seed = 1;
  
  static void print_usage(char* argv[]) {
      printf( "\nusage: %s in.bit out.pcm [settings]\n", argv[ 0 ] );
      printf( "\nin.bit       : Bitstream input to decoder" );
      printf( "\nout.pcm      : Speech output from decoder" );
      printf( "\n   settings:" );
      printf( "\n-Fs_API <Hz> : Sampling rate of output signal in Hz; default: 24000" );
      printf( "\n-loss <perc> : Simulated packet loss percentage (0-100); default: 0" );
      printf( "\n-quiet       : Print out just some basic values" );
      printf( "\n" );
  }
  
  int main( int argc, char* argv[] )
  {
      unsigned long tottime, starttime;
      double    filetime;
      size_t    counter;
      SKP_int32 args, totPackets, i, k;
      SKP_int16 ret, len, tot_len;
      SKP_int16 nBytes;
      SKP_uint8 payload[    MAX_BYTES_PER_FRAME * MAX_INPUT_FRAMES * ( MAX_LBRR_DELAY + 1 ) ];
      SKP_uint8 *payloadEnd = NULL, *payloadToDec = NULL;
      SKP_uint8 FECpayload[ MAX_BYTES_PER_FRAME * MAX_INPUT_FRAMES ], *payloadPtr;
      SKP_int16 nBytesFEC;
      SKP_int16 nBytesPerPacket[ MAX_LBRR_DELAY + 1 ], totBytes;
      SKP_int16 out[ ( ( FRAME_LENGTH_MS * MAX_API_FS_KHZ ) << 1 ) * MAX_INPUT_FRAMES ], *outPtr;
      char      speechOutFileName[ 150 ], bitInFileName[ 150 ];
      FILE      *bitInFile, *speechOutFile;
      SKP_int32 packetSize_ms=0, API_Fs_Hz = 0;
      SKP_int32 decSizeBytes;
      void      *psDec;
      SKP_float loss_prob;
      SKP_int32 frames, lost, quiet;
      SKP_SILK_SDK_DecControlStruct DecControl;
  
      if( argc < 3 ) {
          print_usage( argv );
          exit( 0 );
      } 
  
      /* default settings */
      quiet     = 0;
      loss_prob = 0.0f;
  
      /* get arguments */
      args = 1;
      strcpy( bitInFileName, argv[ args ] );
      args++;
      strcpy( speechOutFileName, argv[ args ] );
      args++;
      while( args < argc ) {
          if( SKP_STR_CASEINSENSITIVE_COMPARE( argv[ args ], "-loss" ) == 0 ) {
              sscanf( argv[ args + 1 ], "%f", &loss_prob );
              args += 2;
          } else if( SKP_STR_CASEINSENSITIVE_COMPARE( argv[ args ], "-Fs_API" ) == 0 ) {
              sscanf( argv[ args + 1 ], "%d", &API_Fs_Hz );
              args += 2;
          } else if( SKP_STR_CASEINSENSITIVE_COMPARE( argv[ args ], "-quiet" ) == 0 ) {
              quiet = 1;
              args++;
          } else {
              printf( "Error: unrecognized setting: %s\n\n", argv[ args ] );
              print_usage( argv );
              exit( 0 );
          }
      }
  
      if( !quiet ) {
          printf("********** Silk Decoder (Fixed Point) v %s ********************\n", SKP_Silk_SDK_get_version());
          printf("********** Compiled for %d bit cpu *******************************\n", (int)sizeof(void*) * 8 );
          printf( "Input:                       %s\n", bitInFileName );
          printf( "Output:                      %s\n", speechOutFileName );
      }
  
      /* Open files */
      bitInFile = fopen( bitInFileName, "rb" );
      if( bitInFile == NULL ) {
          printf( "Error: could not open input file %s\n", bitInFileName );
          exit( 0 );
      } 
  
      /* Check Silk header */
      {
          char header_buf[ 50 ];
          counter = fread( header_buf, sizeof( char ), strlen( "#!SILK_V3" ), bitInFile );
          header_buf[ strlen( "#!SILK_V3" ) ] = '\0'; /* Terminate with a null character */
          if( strcmp( header_buf, "#!SILK_V3" ) != 0 ) { 
              /* Non-equal strings */
              printf( "Error: Wrong Header %s\n", header_buf );
              exit( 0 );
          }
      }
  
      speechOutFile = fopen( speechOutFileName, "wb" );
      if( speechOutFile == NULL ) {
          printf( "Error: could not open output file %s\n", speechOutFileName );
          exit( 0 );
      }
  
      /* Set the samplingrate that is requested for the output */
      if( API_Fs_Hz == 0 ) {
          DecControl.API_sampleRate = 24000;
      } else {
          DecControl.API_sampleRate = API_Fs_Hz;
      }
  
      /* Initialize to one frame per packet, for proper concealment before first packet arrives */
      DecControl.framesPerPacket = 1;
  
      /* Create decoder */
      ret = SKP_Silk_SDK_Get_Decoder_Size( &decSizeBytes );
      if( ret ) {
          printf( "\nSKP_Silk_SDK_Get_Decoder_Size returned %d", ret );
      }
      psDec = malloc( decSizeBytes );
  
      /* Reset decoder */
      ret = SKP_Silk_SDK_InitDecoder( psDec );
      if( ret ) {
          printf( "\nSKP_Silk_InitDecoder returned %d", ret );
      }
  
      totPackets = 0;
      tottime    = 0;
      payloadEnd = payload;
  
      /* Simulate the jitter buffer holding MAX_FEC_DELAY packets */
      for( i = 0; i < MAX_LBRR_DELAY; i++ ) {
          /* Read payload size */
          counter = fread( &nBytes, sizeof( SKP_int16 ), 1, bitInFile );
  #ifdef _SYSTEM_IS_BIG_ENDIAN
          swap_endian( &nBytes, 1 );
  #endif
          /* Read payload */
          counter = fread( payloadEnd, sizeof( SKP_uint8 ), nBytes, bitInFile );
  
          if( ( SKP_int16 )counter < nBytes ) {
              break;
          }
          nBytesPerPacket[ i ] = nBytes;
          payloadEnd          += nBytes;
          totPackets++;
      }
  
      while( 1 ) {
          /* Read payload size */
          counter = fread( &nBytes, sizeof( SKP_int16 ), 1, bitInFile );
  #ifdef _SYSTEM_IS_BIG_ENDIAN
          swap_endian( &nBytes, 1 );
  #endif
          if( nBytes < 0 || counter < 1 ) {
              break;
          }
          
          /* Read payload */
          counter = fread( payloadEnd, sizeof( SKP_uint8 ), nBytes, bitInFile );
          if( ( SKP_int16 )counter < nBytes ) {
              break;
          }
  
          /* Simulate losses */
          rand_seed = SKP_RAND( rand_seed );
          if( ( ( ( float )( ( rand_seed >> 16 ) + ( 1 << 15 ) ) ) / 65535.0f >= ( loss_prob / 100.0f ) ) && ( counter > 0 ) ) {
              nBytesPerPacket[ MAX_LBRR_DELAY ] = nBytes;
              payloadEnd                       += nBytes;
          } else {
              nBytesPerPacket[ MAX_LBRR_DELAY ] = 0;
          }
  
          if( nBytesPerPacket[ 0 ] == 0 ) {
              /* Indicate lost packet */
              lost = 1;
  
              /* Packet loss. Search after FEC in next packets. Should be done in the jitter buffer */
              payloadPtr = payload;
              for( i = 0; i < MAX_LBRR_DELAY; i++ ) {
                  if( nBytesPerPacket[ i + 1 ] > 0 ) {
                      starttime = GetHighResolutionTime();
                      SKP_Silk_SDK_search_for_LBRR( payloadPtr, nBytesPerPacket[ i + 1 ], ( i + 1 ), FECpayload, &nBytesFEC );
                      tottime += GetHighResolutionTime() - starttime;
                      if( nBytesFEC > 0 ) {
                          payloadToDec = FECpayload;
                          nBytes = nBytesFEC;
                          lost = 0;
                          break;
                      }
                  }
                  payloadPtr += nBytesPerPacket[ i + 1 ];
              }
          } else {
              lost = 0;
              nBytes = nBytesPerPacket[ 0 ];
              payloadToDec = payload;
          }
  
          /* Silk decoder */
          outPtr = out;
          tot_len = 0;
          starttime = GetHighResolutionTime();
  
          if( lost == 0 ) {
              /* No Loss: Decode all frames in the packet */
              frames = 0;
              do {
                  /* Decode 20 ms */
                  ret = SKP_Silk_SDK_Decode( psDec, &DecControl, 0, payloadToDec, nBytes, outPtr, &len );
                  if( ret ) {
                      printf( "\nSKP_Silk_SDK_Decode returned %d", ret );
                  }
  
                  frames++;
                  outPtr  += len;
                  tot_len += len;
                  if( frames > MAX_INPUT_FRAMES ) {
                      /* Hack for corrupt stream that could generate too many frames */
                      outPtr  = out;
                      tot_len = 0;
                      frames  = 0;
                  }
                  /* Until last 20 ms frame of packet has been decoded */
              } while( DecControl.moreInternalDecoderFrames ); 
          } else {    
              /* Loss: Decode enough frames to cover one packet duration */
              for( i = 0; i < DecControl.framesPerPacket; i++ ) {
                  /* Generate 20 ms */
                  ret = SKP_Silk_SDK_Decode( psDec, &DecControl, 1, payloadToDec, nBytes, outPtr, &len );
                  if( ret ) {
                      printf( "\nSKP_Silk_Decode returned %d", ret );
                  }
                  outPtr  += len;
                  tot_len += len;
              }
          }
  
          packetSize_ms = tot_len / ( DecControl.API_sampleRate / 1000 );
          tottime += GetHighResolutionTime() - starttime;
          totPackets++;
  
          /* Write output to file */
  #ifdef _SYSTEM_IS_BIG_ENDIAN   
          swap_endian( out, tot_len );
  #endif
          fwrite( out, sizeof( SKP_int16 ), tot_len, speechOutFile );
  
          /* Update buffer */
          totBytes = 0;
          for( i = 0; i < MAX_LBRR_DELAY; i++ ) {
              totBytes += nBytesPerPacket[ i + 1 ];
          }
          SKP_memmove( payload, &payload[ nBytesPerPacket[ 0 ] ], totBytes * sizeof( SKP_uint8 ) );
          payloadEnd -= nBytesPerPacket[ 0 ];
          SKP_memmove( nBytesPerPacket, &nBytesPerPacket[ 1 ], MAX_LBRR_DELAY * sizeof( SKP_int16 ) );
  
          if( !quiet ) {
              fprintf( stderr, "\rPackets decoded:             %d", totPackets );
          }
      }
  
      /* Empty the recieve buffer */
      for( k = 0; k < MAX_LBRR_DELAY; k++ ) {
          if( nBytesPerPacket[ 0 ] == 0 ) {
              /* Indicate lost packet */
              lost = 1;
  
              /* Packet loss. Search after FEC in next packets. Should be done in the jitter buffer */
              payloadPtr = payload;
              for( i = 0; i < MAX_LBRR_DELAY; i++ ) {
                  if( nBytesPerPacket[ i + 1 ] > 0 ) {
                      starttime = GetHighResolutionTime();
                      SKP_Silk_SDK_search_for_LBRR( payloadPtr, nBytesPerPacket[ i + 1 ], ( i + 1 ), FECpayload, &nBytesFEC );
                      tottime += GetHighResolutionTime() - starttime;
                      if( nBytesFEC > 0 ) {
                          payloadToDec = FECpayload;
                          nBytes = nBytesFEC;
                          lost = 0;
                          break;
                      }
                  }
                  payloadPtr += nBytesPerPacket[ i + 1 ];
              }
          } else {
              lost = 0;
              nBytes = nBytesPerPacket[ 0 ];
              payloadToDec = payload;
          }
  
          /* Silk decoder */
          outPtr  = out;
          tot_len = 0;
          starttime = GetHighResolutionTime();
  
          if( lost == 0 ) {
              /* No loss: Decode all frames in the packet */
              frames = 0;
              do {
                  /* Decode 20 ms */
                  ret = SKP_Silk_SDK_Decode( psDec, &DecControl, 0, payloadToDec, nBytes, outPtr, &len );
                  if( ret ) {
                      printf( "\nSKP_Silk_SDK_Decode returned %d", ret );
                  }
  
                  frames++;
                  outPtr  += len;
                  tot_len += len;
                  if( frames > MAX_INPUT_FRAMES ) {
                      /* Hack for corrupt stream that could generate too many frames */
                      outPtr  = out;
                      tot_len = 0;
                      frames  = 0;
                  }
              /* Until last 20 ms frame of packet has been decoded */
              } while( DecControl.moreInternalDecoderFrames );
          } else {    
              /* Loss: Decode enough frames to cover one packet duration */
  
              /* Generate 20 ms */
              for( i = 0; i < DecControl.framesPerPacket; i++ ) {
                  ret = SKP_Silk_SDK_Decode( psDec, &DecControl, 1, payloadToDec, nBytes, outPtr, &len );
                  if( ret ) {
                      printf( "\nSKP_Silk_Decode returned %d", ret );
                  }
                  outPtr  += len;
                  tot_len += len;
              }
          }
  
          packetSize_ms = tot_len / ( DecControl.API_sampleRate / 1000 );
          tottime += GetHighResolutionTime() - starttime;
          totPackets++;
  
          /* Write output to file */
  #ifdef _SYSTEM_IS_BIG_ENDIAN   
          swap_endian( out, tot_len );
  #endif
          fwrite( out, sizeof( SKP_int16 ), tot_len, speechOutFile );
  
          /* Update Buffer */
          totBytes = 0;
          for( i = 0; i < MAX_LBRR_DELAY; i++ ) {
              totBytes += nBytesPerPacket[ i + 1 ];
          }
          SKP_memmove( payload, &payload[ nBytesPerPacket[ 0 ] ], totBytes * sizeof( SKP_uint8 ) );
          payloadEnd -= nBytesPerPacket[ 0 ];
          SKP_memmove( nBytesPerPacket, &nBytesPerPacket[ 1 ], MAX_LBRR_DELAY * sizeof( SKP_int16 ) );
  
          if( !quiet ) {
              fprintf( stderr, "\rPackets decoded:              %d", totPackets );
          }
      }
  
      if( !quiet ) {
          printf( "\nDecoding Finished \n" );
      }
  
      /* Free decoder */
      free( psDec );
  
      /* Close files */
      fclose( speechOutFile );
      fclose( bitInFile );
  
      filetime = totPackets * 1e-3 * packetSize_ms;
      if( !quiet ) {
          printf("\nFile length:                 %.3f s", filetime);
          printf("\nTime for decoding:           %.3f s (%.3f%% of realtime)", 1e-6 * tottime, 1e-4 * tottime / filetime);
          printf("\n\n");
      } else {
          /* print time and % of realtime */
          printf( "%.3f %.3f %d\n", 1e-6 * tottime, 1e-4 * tottime / filetime, totPackets );
      }
      return 0;
  }
  