[Speex-dev] decoded sample is completely differen from original one

[Jean-Marc Valin]

Hi,

Please start with sampleenc.c/sampledec.c from the manual.

	Jean-Marc

Andre Kirchner a écrit :
> Hi all,
> 
> I have just started playing with speex, and come up with the following code, which just encode a frame of 160 shorts, and the decode it.
> 
> For some reason the decoded sample is completely different than the original one. is my code wrong? If so what? Or is it a reasonable which depends of values that weren't correctly set?
> 
> Thanks,
> 
> Andre
> 
> 
> #include <stdio.h>
> #include <tchar.h>
> 
> #include <speex/speex.h>
> 
> #define FRAME_SIZE   160
> 
> #define QUALITY      8
> #define ENHANCEMENT  1
> 
> int encode(int * nbBytes, char * encSamples)
> {
>    void      * state;
>    SpeexBits   bits;
> 
>    int quality = QUALITY;
> 
>    spx_int16_t   input[] = {0x703B, 0x7361, 0x7567, 0x3969, 0x6874, 0x3B76, 0x3020, 0x3534,
>                             0x3871, 0x7967, 0x3B75, 0x6C6F, 0x7261, 0x7965, 0x2038, 0x3B67,
>                             0x7639, 0x3238, 0x3634, 0x6879, 0x3B20, 0x6F74, 0x6C69, 0x7276,
>                             0x7771, 0x6564, 0x6E76, 0x6B2C, 0x206A, 0x6168, 0x6662, 0x763B,
>                             0x6F2E, 0x7569, 0x7720, 0x7134, 0x2736, 0x3079, 0x3239, 0x5D75,
>                             0x6D20, 0x5B79, 0x7530, 0x3160, 0x7120, 0x2765, 0x3974, 0x7570,
>                             0x6867, 0x5B62, 0x3032, 0x3834, 0x7579, 0x5B67, 0x6F27, 0x7169,
>                             0x6733, 0x6879, 0x633B, 0x696F, 0x7175, 0x6576, 0x2772, 0x3039,
>                             0x6A62, 0x3471, 0x5D74, 0x2D67, 0x7539, 0x7168, 0x656D, 0x3527,
>                             0x6967, 0x3930, 0x6A68, 0x626D, 0x7227, 0x6577, 0x7030, 0x6879,
>                             0x276D, 0x725B, 0x3577, 0x2069, 0x2762, 0x696F, 0x7765, 0x7468,
>                             0x766A, 0x3067, 0x3927, 0x3477, 0x7579, 0x7027, 0x7769, 0x6562,
>                             0x276A, 0x6C67, 0x766B, 0x6E63, 0x716A, 0x6576, 0x3B6C, 0x6F69,
>                             0x6772, 0x3B68, 0x5B77, 0x3470, 0x6733, 0x6A68, 0x7170, 0x6F6B,
>                             0x6A67, 0x6E66, 0x3B63, 0x276D, 0x6F20, 0x716C, 0x6869, 0x3874,
>                             0x3979, 0x7220, 0x7663, 0x6874, 0x716A, 0x6570, 0x7775, 0x6A72,
>                             0x7666, 0x3063, 0x7139, 0x772D, 0x7533, 0x7974, 0x696F, 0x2770,
>                             0x6372, 0x6B67, 0x6577, 0x2762, 0x6F34, 0x6220, 0x345D, 0x7730,
>                             0x3638, 0x7935, 0x7475, 0x5B63, 0x306E, 0x3371, 0x7738, 0x7432,
>                             0x5B79, 0x676E, 0x665D, 0x6376, 0x696F, 0x6830, 0x6577, 0x6D74};
> 
>    state = speex_encoder_init(speex_lib_get_mode(SPEEX_MODEID_NB));
>    speex_encoder_ctl(state, SPEEX_SET_QUALITY, &quality);
> 
>    speex_bits_init(&bits);
>    speex_bits_reset(&bits);
> 
>    speex_encode_int(state, &input[0], &bits);
>    speex_bits_insert_terminator(&bits);
> 
>    * nbBytes = speex_bits_write(&bits, encSamples, FRAME_SIZE);
>    
>    speex_encoder_destroy(state);
>    speex_bits_destroy(&bits);
> 
>    return 0;
> }
> 
> 
> int decode(int nbBytes, char * encSamples)
> {
>    spx_int16_t   output[FRAME_SIZE];
> 
>    void        * state;
>    SpeexBits     bits;
> 
>    int enhancement = ENHANCEMENT;
> 
>    state = speex_decoder_init(speex_lib_get_mode(SPEEX_MODEID_NB));
>    speex_decoder_ctl(state, SPEEX_SET_ENH, &enhancement);
> 
>    speex_bits_init(&bits);
> 
>    speex_bits_read_from(&bits, encSamples, nbBytes);
> 
>    speex_decode_int(state, &bits, output);
> 
>    for(int i = 0; i < FRAME_SIZE; i++)
>    {
>       printf(" %04X", (short)output[i] & 0xFFFF);
>       if((i + 1) % 8 == 0)
>       {
>          printf("\n");
>       }
>    }
>    
>    speex_decoder_destroy(state);
>    speex_bits_destroy(&bits);
> 
>    return 0;
> }
> 
> 
> int _tmain(int argc, _TCHAR* argv[])
> {
>    int  nbBytes;
>    char encSamples[FRAME_SIZE];
> 
>    encode(&nbBytes, encSamples);
>    decode(nbBytes, encSamples);
> 
>     return 0;
> }
> 
> 
>       
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