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

/* 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( "\nstream.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" );
}

int main( int argc, char* argv[] )
{
    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 API_Fs_Hz = 0;
    SKP_int32 decSizeBytes;
    void      *psDec;
    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 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" ) ] = ( char )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;
    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;
    }

    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 ) {
                    SKP_Silk_SDK_search_for_LBRR( payloadPtr, nBytesPerPacket[ i + 1 ], i + 1, FECpayload, &nBytesFEC );
                    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;

        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;
            }
        }
        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 ) {
                    SKP_Silk_SDK_search_for_LBRR( payloadPtr, nBytesPerPacket[ i + 1 ], i + 1, FECpayload, &nBytesFEC );
                    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;

        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;
            }
        }
        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 );

    return 0;
}
