Revision 7087ce08 libavcodec/costablegen.c

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libavcodec/costablegen.c
29 29 
#endif
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#define BITS 16
31 31 
#define FLOATFMT "%.18e"
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#define FIXEDFMT "%6d"
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static int clip_f15(int v)


  		




  
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{


  		




  
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    return v < -32767 ? -32767 :


  		




  
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           v >  32767 ?  32767 :


  		




  
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           v;


  		




  
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}


  		




  
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static void printval(double val, int fixed)


  		




  
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{


  		




  
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    if (fixed)


  		




  
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        printf(" "FIXEDFMT",", clip_f15(lrint(val * (double)(1<<15))));


  		




  
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    else


  		




  
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        printf(" "FLOATFMT",", val);


  		




  
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}


  		




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int main(int argc, char *argv[])


  		




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{


  		




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    int i, j;


  		




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    int do_sin = argc == 2 && !strcmp(argv[1], "sin");


  		




  
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    int do_sin = argc > 1 && !strcmp(argv[1], "sin");


  		




  
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    int fixed  = argc > 2 && !strcmp(argv[2], "fixed");


  		




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    double (*func)(double) = do_sin ? sin : cos;


  		




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    printf("/* This file was generated by libavcodec/costablegen */\n");


  		




  
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    printf("#define CONFIG_FFT_FLOAT %d\n", !fixed);


  		




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    printf("#include \"libavcodec/%s\"\n", do_sin ? "rdft.h" : "fft.h");


  		




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    for (i = 4; i <= BITS; i++) {


  		




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        int m = 1 << i;


  		




  ......




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            int idx = j > m/4 ? m/2 - j : j;


  		




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            if (do_sin && j >= m/4)


  		




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                idx = m/4 - j;


  		




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            printf(" "FLOATFMT",", func(idx*freq));


  		




  
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            printval(func(idx*freq), fixed);


  		




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            if ((j & 3) == 3)


  		




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                printf("\n   ");


  		




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        }


  		




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        printf(" "FLOATFMT"\n};\n", func(do_sin ? -(m/4 - 1)*freq : freq));


  		




  
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        printval(func(do_sin ? -(m/4 - 1)*freq : freq), fixed);


  		




  
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        printf("\n};\n");


  		




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    }


  		




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    return 0;


  		




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}


  		












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