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* exception also makes it possible to release a modified version which |
* exception also makes it possible to release a modified version which |
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* carries forward this exception. |
* carries forward this exception. |
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* |
* |
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* $Id: quant_mpeg4.c,v 1.6 2002-11-17 00:41:19 edgomez Exp $ |
* $Id: quant_mpeg4.c,v 1.7 2002-11-26 23:44:11 edgomez Exp $ |
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* |
* |
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****************************************************************************/ |
****************************************************************************/ |
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* Functions |
* Functions |
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****************************************************************************/ |
****************************************************************************/ |
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/* quantize intra-block |
#if 0 |
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/* quantize intra-block */ |
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// const int32_t quantd = DIV_DIV(VM18P*quant, VM18Q); |
// const int32_t quantd = DIV_DIV(VM18P*quant, VM18Q); |
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// |
// |
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// level = DIV_DIV(16 * data[i], default_intra_matrix[i]); |
// level = DIV_DIV(16 * data[i], default_intra_matrix[i]); |
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// coeff[i] = (level + quantd) / quant2; |
// coeff[i] = (level + quantd) / quant2; |
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*/ |
#endif |
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void |
void |
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quant4_intra_c(int16_t * coeff, |
quant4_intra_c(int16_t * coeff, |
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/* dequantize intra-block & clamp to [-2048,2047] |
/* dequantize intra-block & clamp to [-2048,2047] */ |
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// data[i] = (coeff[i] * default_intra_matrix[i] * quant2) >> 4; |
/* data[i] = (coeff[i] * default_intra_matrix[i] * quant2) >> 4; */ |
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*/ |
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void |
void |
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dequant4_intra_c(int16_t * data, |
dequant4_intra_c(int16_t * data, |
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level = (level * intra_matrix[i] * quant) >> 3; |
level = (level * intra_matrix[i] * quant) >> 3; |
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data[i] = (level <= 2048 ? -(int16_t) level : -2048); |
data[i] = (level <= 2048 ? -(int16_t) level : -2048); |
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} else // if (coeff[i] > 0) |
} else /* if (coeff[i] > 0) */ |
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{ |
{ |
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uint32_t level = coeff[i]; |
uint32_t level = coeff[i]; |
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/* quantize inter-block |
#if 0 |
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/* quantize inter-block */ |
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// level = DIV_DIV(16 * data[i], default_intra_matrix[i]); |
// level = DIV_DIV(16 * data[i], default_intra_matrix[i]); |
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// coeff[i] = (level + quantd) / quant2; |
// coeff[i] = (level + quantd) / quant2; |
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// sum += abs(level); |
// sum += abs(level); |
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*/ |
#endif |
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uint32_t |
uint32_t |
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quant4_inter_c(int16_t * coeff, |
quant4_inter_c(int16_t * coeff, |
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level = ((2 * level + 1) * inter_matrix[i] * quant) >> 4; |
level = ((2 * level + 1) * inter_matrix[i] * quant) >> 4; |
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data[i] = (level <= 2048 ? -level : -2048); |
data[i] = (level <= 2048 ? -level : -2048); |
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} else // if (coeff[i] > 0) |
} else /* if (coeff[i] > 0) */ |
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{ |
{ |
259 |
uint32_t level = coeff[i]; |
uint32_t level = coeff[i]; |
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sum ^= data[i]; |
sum ^= data[i]; |
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} |
} |
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// mismatch control |
/* mismatch control */ |
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if ((sum & 1) == 0) { |
if ((sum & 1) == 0) { |
271 |
data[63] ^= 1; |
data[63] ^= 1; |