X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=wmadec_filter.c;h=befc39434d9c2aa8a8057957db37ad8eae4b406e;hp=fccd8907e264bcf6b0609425cb629fadd3f521d0;hb=d1ff8d2c414883209717cf65e37113f9f52fef63;hpb=b629661a56a97563a784b305e76d2b6c6bc7e7cc

diff --git a/wmadec_filter.c b/wmadec_filter.c
index fccd8907..befc3943 100644
--- a/wmadec_filter.c
+++ b/wmadec_filter.c
@@ -723,6 +723,117 @@ static int compute_high_band_values(struct private_wmadec_data *pwd,
 	return 1;
 }
 
+static void compute_mdct_coefficients(struct private_wmadec_data *pwd,
+		int bsize, int total_gain, int nb_coefs[MAX_CHANNELS])
+{
+	int ch;
+	float mdct_norm = 1.0 / (pwd->block_len / 2);
+
+	for (ch = 0; ch < pwd->ahi.channels; ch++) {
+		int16_t *coefs1;
+		float *coefs, *exponents, mult, mult1, noise;
+		int i, j, n, n1, last_high_band, esize;
+		float exp_power[HIGH_BAND_MAX_SIZE];
+
+		if (!pwd->channel_coded[ch])
+			continue;
+		coefs1 = pwd->coefs1[ch];
+		exponents = pwd->exponents[ch];
+		esize = pwd->exponents_bsize[ch];
+		mult = pow(10, total_gain * 0.05) / pwd->max_exponent[ch];
+		mult *= mdct_norm;
+		coefs = pwd->coefs[ch];
+		if (!pwd->use_noise_coding) {
+			/* XXX: optimize more */
+			for (i = 0; i < pwd->coefs_start; i++)
+				*coefs++ = 0.0;
+			n = nb_coefs[ch];
+			for (i = 0; i < n; i++)
+				*coefs++ = coefs1[i] *
+					exponents[i << bsize >> esize] * mult;
+			n = pwd->block_len - pwd->coefs_end[bsize];
+			for (i = 0; i < n; i++)
+				*coefs++ = 0.0;
+			continue;
+		}
+		mult1 = mult;
+		/* very low freqs: noise */
+		for (i = 0; i < pwd->coefs_start; i++) {
+			*coefs++ = pwd->noise_table[pwd->noise_index] *
+				exponents[i << bsize >> esize] * mult1;
+			pwd->noise_index = (pwd->noise_index + 1) &
+				(NOISE_TAB_SIZE - 1);
+		}
+		n1 = pwd->exponent_high_sizes[bsize];
+		/* compute power of high bands */
+		exponents = pwd->exponents[ch] +
+			(pwd->high_band_start[bsize] << bsize);
+		last_high_band = 0; /* avoid warning */
+		for (j = 0; j < n1; j++) {
+			n = pwd->exponent_high_bands[
+				pwd->frame_len_bits - pwd->block_len_bits][j];
+			if (pwd->high_band_coded[ch][j]) {
+				float e2, val;
+				e2 = 0;
+				for (i = 0; i < n; i++) {
+					val = exponents[i << bsize >> esize];
+					e2 += val * val;
+				}
+				exp_power[j] = e2 / n;
+				last_high_band = j;
+			}
+			exponents += n << bsize;
+		}
+		/* main freqs and high freqs */
+		exponents = pwd->exponents[ch] + (pwd->coefs_start << bsize);
+		for (j = -1; j < n1; j++) {
+			if (j < 0)
+				n = pwd->high_band_start[bsize]
+					- pwd->coefs_start;
+			else
+				n = pwd->exponent_high_bands[pwd->frame_len_bits
+					- pwd->block_len_bits][j];
+			if (j >= 0 && pwd->high_band_coded[ch][j]) {
+				/* use noise with specified power */
+				mult1 = sqrt(exp_power[j]
+					/ exp_power[last_high_band]);
+				/* XXX: use a table */
+				mult1 = mult1 * pow(10,
+					pwd->high_band_values[ch][j] * 0.05);
+				mult1 /= (pwd->max_exponent[ch] * pwd->noise_mult);
+				mult1 *= mdct_norm;
+				for (i = 0; i < n; i++) {
+					noise = pwd->noise_table[pwd->noise_index];
+					pwd->noise_index = (pwd->noise_index + 1)
+						& (NOISE_TAB_SIZE - 1);
+					*coefs++ = noise * exponents[
+						i << bsize >> esize] * mult1;
+				}
+				exponents += n << bsize;
+			} else {
+				/* coded values + small noise */
+				for (i = 0; i < n; i++) {
+					noise = pwd->noise_table[pwd->noise_index];
+					pwd->noise_index = (pwd->noise_index + 1)
+						& (NOISE_TAB_SIZE - 1);
+					*coefs++ = ((*coefs1++) + noise) *
+						exponents[i << bsize >> esize]
+						* mult;
+				}
+				exponents += n << bsize;
+			}
+		}
+		/* very high freqs: noise */
+		n = pwd->block_len - pwd->coefs_end[bsize];
+		mult1 = mult * exponents[((-1 << bsize)) >> esize];
+		for (i = 0; i < n; i++) {
+			*coefs++ = pwd->noise_table[pwd->noise_index] * mult1;
+			pwd->noise_index = (pwd->noise_index + 1)
+				& (NOISE_TAB_SIZE - 1);
+		}
+	}
+}
+
 /**
  * @return 0 if OK. 1 if last block of frame. return -1 if
  * unrecorrable error.
@@ -732,7 +843,6 @@ static int wma_decode_block(struct private_wmadec_data *pwd)
 	int n, v, ch, code, bsize;
 	int coef_nb_bits, total_gain;
 	int nb_coefs[MAX_CHANNELS];
-	float mdct_norm;
 
 	/* compute current block length */
 	if (pwd->use_variable_block_len) {
@@ -869,166 +979,7 @@ static int wma_decode_block(struct private_wmadec_data *pwd)
 		}
 	}
 
-	/* normalize */
-	{
-		int n4 = pwd->block_len / 2;
-		mdct_norm = 1.0 / (float) n4;
-	}
-
-	/* finally compute the MDCT coefficients */
-	for (ch = 0; ch < pwd->ahi.channels; ch++) {
-		if (pwd->channel_coded[ch]) {
-			int16_t *coefs1;
-			float *coefs, *exponents, mult, mult1, noise;
-			int i, j, n1, last_high_band, esize;
-			float exp_power[HIGH_BAND_MAX_SIZE];
-
-			coefs1 = pwd->coefs1[ch];
-			exponents = pwd->exponents[ch];
-			esize = pwd->exponents_bsize[ch];
-			mult = pow(10, total_gain * 0.05) / pwd->max_exponent[ch];
-			mult *= mdct_norm;
-			coefs = pwd->coefs[ch];
-			if (pwd->use_noise_coding) {
-				mult1 = mult;
-				/* very low freqs : noise */
-				for (i = 0; i < pwd->coefs_start; i++) {
-					*coefs++ =
-					    pwd->noise_table[pwd->noise_index] *
-					    exponents[i << bsize >> esize] *
-					    mult1;
-					pwd->noise_index =
-					    (pwd->noise_index +
-					     1) & (NOISE_TAB_SIZE - 1);
-				}
-
-				n1 = pwd->exponent_high_sizes[bsize];
-
-				/* compute power of high bands */
-				exponents = pwd->exponents[ch] +
-				    (pwd->high_band_start[bsize] << bsize);
-				last_high_band = 0;	/* avoid warning */
-				for (j = 0; j < n1; j++) {
-					n = pwd->exponent_high_bands[pwd->
-								   frame_len_bits
-								   -
-								   pwd->
-								   block_len_bits]
-					    [j];
-					if (pwd->high_band_coded[ch][j]) {
-						float e2, val;
-						e2 = 0;
-						for (i = 0; i < n; i++) {
-							val = exponents[i << bsize
-								      >> esize];
-							e2 += val * val;
-						}
-						exp_power[j] = e2 / n;
-						last_high_band = j;
-					}
-					exponents += n << bsize;
-				}
-
-				/* main freqs and high freqs */
-				exponents =
-				    pwd->exponents[ch] +
-				    (pwd->coefs_start << bsize);
-				for (j = -1; j < n1; j++) {
-					if (j < 0) {
-						n = pwd->high_band_start[bsize] -
-						    pwd->coefs_start;
-					} else {
-						n = pwd->exponent_high_bands[pwd->
-									   frame_len_bits
-									   -
-									   pwd->
-									   block_len_bits]
-						    [j];
-					}
-					if (j >= 0 && pwd->high_band_coded[ch][j]) {
-						/* use noise with specified power */
-						mult1 =
-						    sqrt(exp_power[j] /
-							 exp_power
-							 [last_high_band]);
-						/* XXX: use a table */
-						mult1 =
-						    mult1 * pow(10,
-								pwd->
-								high_band_values
-								[ch][j] * 0.05);
-						mult1 =
-						    mult1 /
-						    (pwd->max_exponent[ch] *
-						     pwd->noise_mult);
-						mult1 *= mdct_norm;
-						for (i = 0; i < n; i++) {
-							noise =
-							    pwd->noise_table[pwd->
-									   noise_index];
-							pwd->noise_index =
-							    (pwd->noise_index +
-							     1) &
-							    (NOISE_TAB_SIZE -
-							     1);
-							*coefs++ =
-							    noise *
-							    exponents[i << bsize
-								      >> esize]
-							    * mult1;
-						}
-						exponents += n << bsize;
-					} else {
-						/* coded values + small noise */
-						for (i = 0; i < n; i++) {
-							noise =
-							    pwd->noise_table[pwd->
-									   noise_index];
-							pwd->noise_index =
-							    (pwd->noise_index +
-							     1) &
-							    (NOISE_TAB_SIZE -
-							     1);
-							*coefs++ =
-							    ((*coefs1++) +
-							     noise) *
-							    exponents[i << bsize
-								      >> esize]
-							    * mult;
-						}
-						exponents += n << bsize;
-					}
-				}
-
-				/* very high freqs : noise */
-				n = pwd->block_len - pwd->coefs_end[bsize];
-				mult1 =
-				    mult * exponents[((-1 << bsize)) >> esize];
-				for (i = 0; i < n; i++) {
-					*coefs++ =
-					    pwd->noise_table[pwd->noise_index] *
-					    mult1;
-					pwd->noise_index =
-					    (pwd->noise_index +
-					     1) & (NOISE_TAB_SIZE - 1);
-				}
-			} else {
-				/* XXX: optimize more */
-				for (i = 0; i < pwd->coefs_start; i++)
-					*coefs++ = 0.0;
-				n = nb_coefs[ch];
-				for (i = 0; i < n; i++) {
-					*coefs++ =
-					    coefs1[i] *
-					    exponents[i << bsize >> esize] *
-					    mult;
-				}
-				n = pwd->block_len - pwd->coefs_end[bsize];
-				for (i = 0; i < n; i++)
-					*coefs++ = 0.0;
-			}
-		}
-	}
+	compute_mdct_coefficients(pwd, bsize, total_gain, nb_coefs);
 
 	if (pwd->ms_stereo && pwd->channel_coded[1]) {
 		float a, b;