解GOP图像序列

.idea/vcs.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>

app/src/main/cpp/SKP_Silk_LPC_inv_pred_gain.c

@@ -0,0 +1,152 @@
+#include "SKP_Silk_SigProc_FIX.h"
+#define QA          16
+#define A_LIMIT     65520
+
+SKP_int SKP_Silk_LPC_inverse_pred_gain(       /* O:   Returns 1 if unstable, otherwise 0          */
+    SKP_int32           *invGain_Q30,           /* O:   Inverse prediction gain, Q30 energy domain  */
+    const SKP_int16     *A_Q12,                 /* I:   Prediction coefficients, Q12 [order]        */
+    const SKP_int       order                   /* I:   Prediction order                            */
+)
+{
+    SKP_int   k, n, headrm;
+    SKP_int32 rc_Q31, rc_mult1_Q30, rc_mult2_Q16;
+    SKP_int32 Atmp_QA[ 2 ][ SigProc_MAX_ORDER_LPC ], tmp_QA;
+    SKP_int32 *Aold_QA, *Anew_QA;
+
+    Anew_QA = Atmp_QA[ order & 1 ];
+    /* Increase Q domain of the AR coefficients */
+    for( k = 0; k < order; k++ ) {
+        Anew_QA[ k ] = SKP_LSHIFT( (SKP_int32)A_Q12[ k ], QA - 12 );
+    }
+
+    *invGain_Q30 = ( 1 << 30 );
+    for( k = order - 1; k > 0; k-- ) {
+        /* Check for stability */
+        if( ( Anew_QA[ k ] > A_LIMIT ) || ( Anew_QA[ k ] < -A_LIMIT ) ) {
+            return 1;
+        }
+
+        /* Set RC equal to negated AR coef */
+        rc_Q31 = -SKP_LSHIFT( Anew_QA[ k ], 31 - QA );
+        
+        /* rc_mult1_Q30 range: [ 1 : 2^30-1 ] */
+        rc_mult1_Q30 = ( SKP_int32_MAX >> 1 ) - SKP_SMMUL( rc_Q31, rc_Q31 );
+        SKP_assert( rc_mult1_Q30 > ( 1 << 15 ) );                   /* reduce A_LIMIT if fails */
+        SKP_assert( rc_mult1_Q30 < ( 1 << 30 ) );
+
+        /* rc_mult2_Q16 range: [ 2^16 : SKP_int32_MAX ] */
+        rc_mult2_Q16 = SKP_INVERSE32_varQ( rc_mult1_Q30, 46 );      /* 16 = 46 - 30 */
+
+        /* Update inverse gain */
+        /* invGain_Q30 range: [ 0 : 2^30 ] */
+        *invGain_Q30 = SKP_LSHIFT( SKP_SMMUL( *invGain_Q30, rc_mult1_Q30 ), 2 );
+        SKP_assert( *invGain_Q30 >= 0           );
+        SKP_assert( *invGain_Q30 <= ( 1 << 30 ) );
+
+        /* Swap pointers */
+        Aold_QA = Anew_QA;
+        Anew_QA = Atmp_QA[ k & 1 ];
+        
+        /* Update AR coefficient */
+        headrm = SKP_Silk_CLZ32( rc_mult2_Q16 ) - 1;
+        rc_mult2_Q16 = SKP_LSHIFT( rc_mult2_Q16, headrm );          /* Q: 16 + headrm */
+        for( n = 0; n < k; n++ ) {
+            tmp_QA = Aold_QA[ n ] - SKP_LSHIFT( SKP_SMMUL( Aold_QA[ k - n - 1 ], rc_Q31 ), 1 );
+            Anew_QA[ n ] = SKP_LSHIFT( SKP_SMMUL( tmp_QA, rc_mult2_Q16 ), 16 - headrm );
+        }
+    }
+
+    /* Check for stability */
+    if( ( Anew_QA[ 0 ] > A_LIMIT ) || ( Anew_QA[ 0 ] < -A_LIMIT ) ) {
+        return 1;
+    }
+
+    /* Set RC equal to negated AR coef */
+    rc_Q31 = -SKP_LSHIFT( Anew_QA[ 0 ], 31 - QA );
+
+    /* Range: [ 1 : 2^30 ] */
+    rc_mult1_Q30 = ( SKP_int32_MAX >> 1 ) - SKP_SMMUL( rc_Q31, rc_Q31 );
+
+    /* Update inverse gain */
+    /* Range: [ 0 : 2^30 ] */
+    *invGain_Q30 = SKP_LSHIFT( SKP_SMMUL( *invGain_Q30, rc_mult1_Q30 ), 2 );
+    SKP_assert( *invGain_Q30 >= 0     );
+    SKP_assert( *invGain_Q30 <= 1<<30 );
+
+    return 0;
+}
+
+/* For input in Q13 domain */
+SKP_int SKP_Silk_LPC_inverse_pred_gain_Q13(   /* O:   Returns 1 if unstable, otherwise 0          */
+    SKP_int32           *invGain_Q30,           /* O:   Inverse prediction gain, Q30 energy domain  */
+    const SKP_int16     *A_Q13,                 /* I:   Prediction coefficients, Q13 [order]        */
+    const SKP_int       order                   /* I:   Prediction order                            */
+)
+{
+    SKP_int   k, n, headrm;
+    SKP_int32 rc_Q31, rc_mult1_Q30, rc_mult2_Q16;
+    SKP_int32 Atmp_QA[ 2 ][ SigProc_MAX_ORDER_LPC ], tmp_QA;
+    SKP_int32 *Aold_QA, *Anew_QA;
+
+    Anew_QA = Atmp_QA[ order & 1 ];
+    /* Increase Q domain of the AR coefficients */
+    for( k = 0; k < order; k++ ) {
+        Anew_QA[ k ] = SKP_LSHIFT( (SKP_int32)A_Q13[ k ], QA - 13 );
+    }
+
+    *invGain_Q30 = ( 1 << 30 );
+    for( k = order - 1; k > 0; k-- ) {
+        /* Check for stability */
+        if( ( Anew_QA[ k ] > A_LIMIT ) || ( Anew_QA[ k ] < -A_LIMIT ) ) {
+            return 1;
+        }
+
+        /* Set RC equal to negated AR coef */
+        rc_Q31 = -SKP_LSHIFT( Anew_QA[ k ], 31 - QA );
+        
+        /* rc_mult1_Q30 range: [ 1 : 2^30-1 ] */
+        rc_mult1_Q30 = ( SKP_int32_MAX >> 1 ) - SKP_SMMUL( rc_Q31, rc_Q31 );
+        SKP_assert( rc_mult1_Q30 > ( 1 << 15 ) );                   /* reduce A_LIMIT if fails */
+        SKP_assert( rc_mult1_Q30 < ( 1 << 30 ) );
+
+        /* rc_mult2_Q16 range: [ 2^16 : SKP_int32_MAX ] */
+        rc_mult2_Q16 = SKP_INVERSE32_varQ( rc_mult1_Q30, 46 );      /* 16 = 46 - 30 */
+
+        /* Update inverse gain */
+        /* invGain_Q30 range: [ 0 : 2^30 ] */
+        *invGain_Q30 = SKP_LSHIFT( SKP_SMMUL( *invGain_Q30, rc_mult1_Q30 ), 2 );
+        SKP_assert( *invGain_Q30 >= 0     );
+        SKP_assert( *invGain_Q30 <= 1<<30 );
+
+        /* Swap pointers */
+        Aold_QA = Anew_QA;
+        Anew_QA = Atmp_QA[ k & 1 ];
+        
+        /* Update AR coefficient */
+        headrm = SKP_Silk_CLZ32( rc_mult2_Q16 ) - 1;
+        rc_mult2_Q16 = SKP_LSHIFT( rc_mult2_Q16, headrm );          /* Q: 16 + headrm */
+        for( n = 0; n < k; n++ ) {
+            tmp_QA = Aold_QA[ n ] - SKP_LSHIFT( SKP_SMMUL( Aold_QA[ k - n - 1 ], rc_Q31 ), 1 );
+            Anew_QA[ n ] = SKP_LSHIFT( SKP_SMMUL( tmp_QA, rc_mult2_Q16 ), 16 - headrm );
+        }
+    }
+
+    /* Check for stability */
+    if( ( Anew_QA[ 0 ] > A_LIMIT ) || ( Anew_QA[ 0 ] < -A_LIMIT ) ) {
+        return 1;
+    }
+
+    /* Set RC equal to negated AR coef */
+    rc_Q31 = -SKP_LSHIFT( Anew_QA[ 0 ], 31 - QA );
+
+    /* Range: [ 1 : 2^30 ] */
+    rc_mult1_Q30 = ( SKP_int32_MAX >> 1 ) - SKP_SMMUL( rc_Q31, rc_Q31 );
+
+    /* Update inverse gain */
+    /* Range: [ 0 : 2^30 ] */
+    *invGain_Q30 = SKP_LSHIFT( SKP_SMMUL( *invGain_Q30, rc_mult1_Q30 ), 2 );
+    SKP_assert( *invGain_Q30 >= 0     );
+    SKP_assert( *invGain_Q30 <= 1<<30 );
+
+    return 0;
+}