Split out common routines needed in the atrac1 decoder from atrac3.c to atrac.c.

Originally committed as revision 19796 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/Makefile

@@ -48,7 +48,7 @@ OBJS-$(CONFIG_ASV1_DECODER)            += asv1.o mpeg12data.o
 OBJS-$(CONFIG_ASV1_ENCODER)            += asv1.o mpeg12data.o
 OBJS-$(CONFIG_ASV2_DECODER)            += asv1.o mpeg12data.o
 OBJS-$(CONFIG_ASV2_ENCODER)            += asv1.o mpeg12data.o
-OBJS-$(CONFIG_ATRAC3_DECODER)          += atrac3.o
+OBJS-$(CONFIG_ATRAC3_DECODER)          += atrac3.o atrac.o
 OBJS-$(CONFIG_AVS_DECODER)             += avs.o
 OBJS-$(CONFIG_BETHSOFTVID_DECODER)     += bethsoftvideo.o
 OBJS-$(CONFIG_BFI_DECODER)             += bfi.o

libavcodec/atrac.c

+/*
+ * Atrac common functions
+ * Copyright (c) 2006-2008 Maxim Poliakovski
+ * Copyright (c) 2006-2008 Benjamin Larsson
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file libavcodec/atrac.c
+ */
+
+#include <math.h>
+#include <stddef.h>
+#include <stdio.h>
+
+#include "avcodec.h"
+#include "dsputil.h"
+
+float sf_table[64];
+float qmf_window[48];
+
+static const float qmf_48tap_half[24] = {
+   -0.00001461907, -0.00009205479,-0.000056157569,0.00030117269,
+    0.0002422519,  -0.00085293897,-0.0005205574,  0.0020340169,
+    0.00078333891, -0.0042153862, -0.00075614988, 0.0078402944,
+   -0.000061169922,-0.01344162,    0.0024626821,  0.021736089,
+   -0.007801671,   -0.034090221,   0.01880949,    0.054326009,
+   -0.043596379,   -0.099384367,   0.13207909,    0.46424159
+};
+
+/**
+ * Generate common tables
+ */
+
+void atrac_generate_tables(void)
+{
+    int i;
+    float s;
+
+    /* Generate scale factors */
+    if (!sf_table[63])
+        for (i=0 ; i<64 ; i++)
+            sf_table[i] = pow(2.0, (i - 15) / 3.0);
+
+    /* Generate the QMF window. */
+    if (!qmf_window[47])
+        for (i=0 ; i<24; i++) {
+            s = qmf_48tap_half[i] * 2.0;
+            qmf_window[i] = qmf_window[47 - i] = s;
+        }
+}
+
+
+/**
+ * Quadrature mirror synthesis filter.
+ *
+ * @param inlo      lower part of spectrum
+ * @param inhi      higher part of spectrum
+ * @param nIn       size of spectrum buffer
+ * @param pOut      out buffer
+ * @param delayBuf  delayBuf buffer
+ * @param temp      temp buffer
+ */
+
+
+void atrac_iqmf (float *inlo, float *inhi, unsigned int nIn, float *pOut, float *delayBuf, float *temp)
+{
+    int   i, j;
+    float   *p1, *p3;
+
+    memcpy(temp, delayBuf, 46*sizeof(float));
+
+    p3 = temp + 46;
+
+    /* loop1 */
+    for(i=0; i<nIn; i+=2){
+        p3[2*i+0] = inlo[i  ] + inhi[i  ];
+        p3[2*i+1] = inlo[i  ] - inhi[i  ];
+        p3[2*i+2] = inlo[i+1] + inhi[i+1];
+        p3[2*i+3] = inlo[i+1] - inhi[i+1];
+    }
+
+    /* loop2 */
+    p1 = temp;
+    for (j = nIn; j != 0; j--) {
+        float s1 = 0.0;
+        float s2 = 0.0;
+
+        for (i = 0; i < 48; i += 2) {
+            s1 += p1[i] * qmf_window[i];
+            s2 += p1[i+1] * qmf_window[i+1];
+        }
+
+        pOut[0] = s2;
+        pOut[1] = s1;
+
+        p1 += 2;
+        pOut += 2;
+    }
+
+    /* Update the delay buffer. */
+    memcpy(delayBuf, temp + nIn*2, 46*sizeof(float));
+}
+

libavcodec/atrac.h

+/*
+ * Atrac common data
+ * Copyright (c) 2009 Maxim Poliakovski
+ * Copyright (c) 2009 Benjamin Larsson
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file libavcodec/atrac1data.h
+ * Atrac 1 compatible decoder data
+ */
+
+#ifndef AVCODEC_ATRAC_H
+#define AVCODEC_ATRAC_H
+
+
+extern float sf_table[64];
+extern float qmf_window[48];
+
+void atrac_generate_tables(void);
+void atrac_iqmf (float *inlo, float *inhi, unsigned int nIn, float *pOut, float *delayBuf, float *temp);
+
+#endif /* AVCODEC_ATRAC_H */

libavcodec/atrac3.c

@@ -41,6 +41,7 @@
 #include "dsputil.h"
 #include "bytestream.h"
 
+#include "atrac.h"
 #include "atrac3data.h"
 
 #define JOINT_STEREO    0x12
@@ -119,68 +120,13 @@ typedef struct {
 } ATRAC3Context;
 
 static DECLARE_ALIGNED_16(float,mdct_window[512]);
-static float            qmf_window[48];
 static VLC              spectral_coeff_tab[7];
-static float            SFTable[64];
 static float            gain_tab1[16];
 static float            gain_tab2[31];
 static MDCTContext      mdct_ctx;
 static DSPContext       dsp;
 
 
-/* quadrature mirror synthesis filter */
-
-/**
- * Quadrature mirror synthesis filter.
- *
- * @param inlo      lower part of spectrum
- * @param inhi      higher part of spectrum
- * @param nIn       size of spectrum buffer
- * @param pOut      out buffer
- * @param delayBuf  delayBuf buffer
- * @param temp      temp buffer
- */
-
-
-static void iqmf (float *inlo, float *inhi, unsigned int nIn, float *pOut, float *delayBuf, float *temp)
-{
-    int   i, j;
-    float   *p1, *p3;
-
-    memcpy(temp, delayBuf, 46*sizeof(float));
-
-    p3 = temp + 46;
-
-    /* loop1 */
-    for(i=0; i<nIn; i+=2){
-        p3[2*i+0] = inlo[i  ] + inhi[i  ];
-        p3[2*i+1] = inlo[i  ] - inhi[i  ];
-        p3[2*i+2] = inlo[i+1] + inhi[i+1];
-        p3[2*i+3] = inlo[i+1] - inhi[i+1];
-    }
-
-    /* loop2 */
-    p1 = temp;
-    for (j = nIn; j != 0; j--) {
-        float s1 = 0.0;
-        float s2 = 0.0;
-
-        for (i = 0; i < 48; i += 2) {
-            s1 += p1[i] * qmf_window[i];
-            s2 += p1[i+1] * qmf_window[i+1];
-        }
-
-        pOut[0] = s2;
-        pOut[1] = s1;
-
-        p1 += 2;
-        pOut += 2;
-    }
-
-    /* Update the delay buffer. */
-    memcpy(delayBuf, temp + nIn*2, 46*sizeof(float));
-}
-
 /**
  * Regular 512 points IMDCT without overlapping, with the exception of the swapping of odd bands
  * caused by the reverse spectra of the QMF.
@@ -386,7 +332,7 @@ static int decodeSpectrum (GetBitContext *gb, float *pOut)
             readQuantSpectralCoeffs (gb, subband_vlc_index[cnt], codingMode, mantissas, subbWidth);
 
             /* Decode the scale factor for this subband. */
-            SF = SFTable[SF_idxs[cnt]] * iMaxQuant[subband_vlc_index[cnt]];
+            SF = sf_table[SF_idxs[cnt]] * iMaxQuant[subband_vlc_index[cnt]];
 
             /* Inverse quantize the coefficients. */
             for (pIn=mantissas ; first<last; first++, pIn++)
@@ -459,7 +405,7 @@ static int decodeTonalComponents (GetBitContext *gb, tonal_component *pComponent
                 coded_values = coded_values_per_component + 1;
                 coded_values = FFMIN(max_coded_values,coded_values);
 
-                scalefactor = SFTable[sfIndx] * iMaxQuant[quant_step_index];
+                scalefactor = sf_table[sfIndx] * iMaxQuant[quant_step_index];
 
                 readQuantSpectralCoeffs(gb, quant_step_index, coding_mode, mantissa, coded_values);
 
@@ -860,9 +806,9 @@ static int decodeFrame(ATRAC3Context *q, const uint8_t* databuf)
         p2= p1+256;
         p3= p2+256;
         p4= p3+256;
-        iqmf (p1, p2, 256, p1, q->pUnits[i].delayBuf1, q->tempBuf);
-        iqmf (p4, p3, 256, p3, q->pUnits[i].delayBuf2, q->tempBuf);
-        iqmf (p1, p3, 512, p1, q->pUnits[i].delayBuf3, q->tempBuf);
+        atrac_iqmf (p1, p2, 256, p1, q->pUnits[i].delayBuf1, q->tempBuf);
+        atrac_iqmf (p4, p3, 256, p3, q->pUnits[i].delayBuf2, q->tempBuf);
+        atrac_iqmf (p1, p3, 512, p1, q->pUnits[i].delayBuf3, q->tempBuf);
         p1 +=1024;
     }
 
@@ -1038,9 +984,7 @@ static av_cold int atrac3_decode_init(AVCodecContext *avctx)
 
     init_atrac3_transforms(q);
 
-    /* Generate the scale factors. */
-    for (i=0 ; i<64 ; i++)
-        SFTable[i] = pow(2.0, (i - 15) / 3.0);
+    atrac_generate_tables();
 
     /* Generate gain tables. */
     for (i=0 ; i<16 ; i++)