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Remove log2() usage.
Originally committed as revision 7063 to svn://svn.ffmpeg.org/ffmpeg/trunk
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@ -80,7 +80,6 @@ typedef struct {
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float sqrt_tab[30];
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GetBitContext gb;
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VLC huffman_vlc[4][4];
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float flcf1, flcf2;
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int decoder_reset;
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float one_div_log2;
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@ -125,8 +124,6 @@ static int imc_decode_init(AVCodecContext * avctx)
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q->last_fft_im[i] = 0;
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}
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q->flcf1 = log2(10) * 0.05703125;
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q->flcf2 = log2(10) * 0.25;
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/* Generate a square root table */
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@ -236,8 +233,8 @@ static void imc_decode_level_coefficients(IMCContext* q, int* levlCoeffBuf, floa
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float tmp, tmp2;
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//maybe some frequency division thingy
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flcoeffs1[0] = 20000.0 / pow (2, levlCoeffBuf[0] * q->flcf1);
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flcoeffs2[0] = log2(flcoeffs1[0]);
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flcoeffs1[0] = 20000.0 / pow (2, levlCoeffBuf[0] * 0.18945); // 0.18945 = log2(10) * 0.05703125
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flcoeffs2[0] = log(flcoeffs1[0])/log(2);
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tmp = flcoeffs1[0];
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tmp2 = flcoeffs2[0];
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@ -255,7 +252,7 @@ static void imc_decode_level_coefficients(IMCContext* q, int* levlCoeffBuf, floa
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level -=16;
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tmp *= imc_exp_tab[15 + level];
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tmp2 += q->flcf2 * level;
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tmp2 += 0.83048 * level; // 0.83048 = log2(10) * 0.25
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flcoeffs1[i] = tmp;
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flcoeffs2[i] = tmp2;
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}
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@ -273,7 +270,7 @@ static void imc_decode_level_coefficients2(IMCContext* q, int* levlCoeffBuf, flo
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flcoeffs1[i] = 0;
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if(levlCoeffBuf[i] < 16) {
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flcoeffs1[i] = imc_exp_tab2[levlCoeffBuf[i]] * old_floor[i];
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flcoeffs2[i] = (levlCoeffBuf[i]-7) * q->flcf2 + flcoeffs2[i];
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flcoeffs2[i] = (levlCoeffBuf[i]-7) * 0.83048 + flcoeffs2[i]; // 0.83048 = log2(10) * 0.25
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} else {
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flcoeffs1[i] = old_floor[i];
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}
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