Removed all the silk_ prefixes in source file names (not symbols)

1 files changed, 318 insertions, 0 deletions

diff --git a/silk/resampler.c b/silk/resampler.c
new file mode 100644
index 00000000..cb1aeb76
--- /dev/null
+++ b/silk/resampler.c
@@ -0,0 +1,318 @@
+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, (subject to the limitations in the disclaimer below)
+are permitted provided that the following conditions are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+- Neither the name of Skype Limited, nor the names of specific
+contributors, may be used to endorse or promote products derived from
+this software without specific prior written permission.
+NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE GRANTED
+BY THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
+CONTRIBUTORS ''AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
+BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+***********************************************************************/
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+/* Matrix of resampling methods used:
+ *                                        Fs_out (kHz)
+ *                        8      12     16     24     32     44.1   48
+ *
+ *               8        C      UF     U      UF     UF     UF     UF
+ *              12        AF     C      UF     U      UF     UF     UF
+ *              16        D      AF     C      UF     U      UF     UF
+ * Fs_in (kHz)  24        AIF    D      AF     C      UF     UF     U
+ *              32        UF     AF     D      AF     C      UF     UF
+ *              44.1      AMI    AMI    AMI    AMI    AMI    C      UF
+ *              48        DAF    DAF    AF     D      AF     UF     C
+ *
+ * default method: UF
+ *
+ * C   -> Copy (no resampling)
+ * D   -> Allpass-based 2x downsampling
+ * U   -> Allpass-based 2x upsampling
+ * DAF -> Allpass-based 2x downsampling followed by AR2 filter followed by FIR interpolation
+ * UF  -> Allpass-based 2x upsampling followed by FIR interpolation
+ * AMI -> ARMA4 filter followed by FIR interpolation
+ * AF  -> AR2 filter followed by FIR interpolation
+ *
+ * Input signals sampled above 48 kHz are first downsampled to at most 48 kHz.
+ * Output signals sampled above 48 kHz are upsampled from at most 48 kHz.
+ */
+
+#include "resampler_private.h"
+
+/* Greatest common divisor */
+static opus_int32 gcd(
+    opus_int32 a,
+    opus_int32 b
+)
+{
+    opus_int32 tmp;
+    while( b > 0 ) {
+        tmp = a - b * silk_DIV32( a, b );
+        a   = b;
+        b   = tmp;
+    }
+    return a;
+}
+
+/* Initialize/reset the resampler state for a given pair of input/output sampling rates */
+opus_int silk_resampler_init(
+    silk_resampler_state_struct    *S,                    /* I/O: Resampler state             */
+    opus_int32                            Fs_Hz_in,    /* I:    Input sampling rate (Hz)    */
+    opus_int32                            Fs_Hz_out    /* I:    Output sampling rate (Hz)    */
+)
+{
+    opus_int32 cycleLen, cyclesPerBatch, up2 = 0, down2 = 0;
+
+    /* Clear state */
+    silk_memset( S, 0, sizeof( silk_resampler_state_struct ) );
+
+    /* Input checking */
+#if RESAMPLER_SUPPORT_ABOVE_48KHZ
+    if( Fs_Hz_in < 8000 || Fs_Hz_in > 192000 || Fs_Hz_out < 8000 || Fs_Hz_out > 192000 ) {
+#else
+    if( Fs_Hz_in < 8000 || Fs_Hz_in >  48000 || Fs_Hz_out < 8000 || Fs_Hz_out >  48000 ) {
+#endif
+        silk_assert( 0 );
+        return -1;
+    }
+
+#if RESAMPLER_SUPPORT_ABOVE_48KHZ
+    /* Determine pre downsampling and post upsampling */
+    if( Fs_Hz_in > 96000 ) {
+        S->nPreDownsamplers = 2;
+        S->down_pre_function = silk_resampler_private_down4;
+    } else if( Fs_Hz_in > 48000 ) {
+        S->nPreDownsamplers = 1;
+        S->down_pre_function = silk_resampler_down2;
+    } else {
+        S->nPreDownsamplers = 0;
+        S->down_pre_function = NULL;
+    }
+
+    if( Fs_Hz_out > 96000 ) {
+        S->nPostUpsamplers = 2;
+        S->up_post_function = silk_resampler_private_up4;
+    } else if( Fs_Hz_out > 48000 ) {
+        S->nPostUpsamplers = 1;
+        S->up_post_function = silk_resampler_up2;
+    } else {
+        S->nPostUpsamplers = 0;
+        S->up_post_function = NULL;
+    }
+
+    if( S->nPreDownsamplers + S->nPostUpsamplers > 0 ) {
+        /* Ratio of output/input samples */
+        S->ratio_Q16 = silk_LSHIFT32( silk_DIV32( silk_LSHIFT32( Fs_Hz_out, 13 ), Fs_Hz_in ), 3 );
+        /* Make sure the ratio is rounded up */
+        while( silk_SMULWW( S->ratio_Q16, Fs_Hz_in ) < Fs_Hz_out ) S->ratio_Q16++;
+
+        /* Batch size is 10 ms */
+        S->batchSizePrePost = silk_DIV32_16( Fs_Hz_in, 100 );
+
+        /* Convert sampling rate to those after pre-downsampling and before post-upsampling */
+        Fs_Hz_in  = silk_RSHIFT( Fs_Hz_in,  S->nPreDownsamplers  );
+        Fs_Hz_out = silk_RSHIFT( Fs_Hz_out, S->nPostUpsamplers  );
+    }
+#endif
+
+    /* Number of samples processed per batch */
+    /* First, try 10 ms frames */
+    S->batchSize = silk_DIV32_16( Fs_Hz_in, 100 );
+    if( ( silk_MUL( S->batchSize, 100 ) != Fs_Hz_in ) || ( Fs_Hz_in % 100 != 0 ) ) {
+        /* No integer number of input or output samples with 10 ms frames, use greatest common divisor */
+        cycleLen = silk_DIV32( Fs_Hz_in, gcd( Fs_Hz_in, Fs_Hz_out ) );
+        cyclesPerBatch = silk_DIV32( RESAMPLER_MAX_BATCH_SIZE_IN, cycleLen );
+        if( cyclesPerBatch == 0 ) {
+            /* cycleLen too big, let's just use the maximum batch size. Some distortion will result. */
+            S->batchSize = RESAMPLER_MAX_BATCH_SIZE_IN;
+            silk_assert( 0 );
+        } else {
+            S->batchSize = silk_MUL( cyclesPerBatch, cycleLen );
+        }
+    }
+
+
+    /* Find resampler with the right sampling ratio */
+    if( Fs_Hz_out > Fs_Hz_in ) {
+        /* Upsample */
+        if( Fs_Hz_out == silk_MUL( Fs_Hz_in, 2 ) ) {                             /* Fs_out : Fs_in = 2 : 1 */
+            /* Special case: directly use 2x upsampler */
+            S->resampler_function = silk_resampler_private_up2_HQ_wrapper;
+        } else {
+            /* Default resampler */
+            S->resampler_function = silk_resampler_private_IIR_FIR;
+            up2 = 1;
+            if( Fs_Hz_in > 24000 ) {
+                /* Low-quality all-pass upsampler */
+                S->up2_function = silk_resampler_up2;
+            } else {
+                /* High-quality all-pass upsampler */
+                S->up2_function = silk_resampler_private_up2_HQ;
+            }
+        }
+    } else if ( Fs_Hz_out < Fs_Hz_in ) {
+        /* Downsample */
+        if( silk_MUL( Fs_Hz_out, 4 ) == silk_MUL( Fs_Hz_in, 3 ) ) {               /* Fs_out : Fs_in = 3 : 4 */
+            S->FIR_Fracs = 3;
+            S->Coefs = silk_Resampler_3_4_COEFS;
+            S->resampler_function = silk_resampler_private_down_FIR;
+        } else if( silk_MUL( Fs_Hz_out, 3 ) == silk_MUL( Fs_Hz_in, 2 ) ) {        /* Fs_out : Fs_in = 2 : 3 */
+            S->FIR_Fracs = 2;
+            S->Coefs = silk_Resampler_2_3_COEFS;
+            S->resampler_function = silk_resampler_private_down_FIR;
+        } else if( silk_MUL( Fs_Hz_out, 2 ) == Fs_Hz_in ) {                      /* Fs_out : Fs_in = 1 : 2 */
+            S->FIR_Fracs = 1;
+            S->Coefs = silk_Resampler_1_2_COEFS;
+            S->resampler_function = silk_resampler_private_down_FIR;
+        } else if( silk_MUL( Fs_Hz_out, 8 ) == silk_MUL( Fs_Hz_in, 3 ) ) {        /* Fs_out : Fs_in = 3 : 8 */
+            S->FIR_Fracs = 3;
+            S->Coefs = silk_Resampler_3_8_COEFS;
+            S->resampler_function = silk_resampler_private_down_FIR;
+        } else if( silk_MUL( Fs_Hz_out, 3 ) == Fs_Hz_in ) {                      /* Fs_out : Fs_in = 1 : 3 */
+            S->FIR_Fracs = 1;
+            S->Coefs = silk_Resampler_1_3_COEFS;
+            S->resampler_function = silk_resampler_private_down_FIR;
+        } else if( silk_MUL( Fs_Hz_out, 4 ) == Fs_Hz_in ) {                      /* Fs_out : Fs_in = 1 : 4 */
+            S->FIR_Fracs = 1;
+            down2 = 1;
+            S->Coefs = silk_Resampler_1_2_COEFS;
+            S->resampler_function = silk_resampler_private_down_FIR;
+        } else if( silk_MUL( Fs_Hz_out, 6 ) == Fs_Hz_in ) {                      /* Fs_out : Fs_in = 1 : 6 */
+            S->FIR_Fracs = 1;
+            down2 = 1;
+            S->Coefs = silk_Resampler_1_3_COEFS;
+            S->resampler_function = silk_resampler_private_down_FIR;
+        } else if( silk_MUL( Fs_Hz_out, 441 ) == silk_MUL( Fs_Hz_in, 80 ) ) {     /* Fs_out : Fs_in = 80 : 441 */
+            S->Coefs = silk_Resampler_80_441_ARMA4_COEFS;
+            S->resampler_function = silk_resampler_private_IIR_FIR;
+        } else if( silk_MUL( Fs_Hz_out, 441 ) == silk_MUL( Fs_Hz_in, 120 ) ) {    /* Fs_out : Fs_in = 120 : 441 */
+            S->Coefs = silk_Resampler_120_441_ARMA4_COEFS;
+            S->resampler_function = silk_resampler_private_IIR_FIR;
+        } else if( silk_MUL( Fs_Hz_out, 441 ) == silk_MUL( Fs_Hz_in, 160 ) ) {    /* Fs_out : Fs_in = 160 : 441 */
+            S->Coefs = silk_Resampler_160_441_ARMA4_COEFS;
+            S->resampler_function = silk_resampler_private_IIR_FIR;
+        } else if( silk_MUL( Fs_Hz_out, 441 ) == silk_MUL( Fs_Hz_in, 240 ) ) {    /* Fs_out : Fs_in = 240 : 441 */
+            S->Coefs = silk_Resampler_240_441_ARMA4_COEFS;
+            S->resampler_function = silk_resampler_private_IIR_FIR;
+        } else if( silk_MUL( Fs_Hz_out, 441 ) == silk_MUL( Fs_Hz_in, 320 ) ) {    /* Fs_out : Fs_in = 320 : 441 */
+            S->Coefs = silk_Resampler_320_441_ARMA4_COEFS;
+            S->resampler_function = silk_resampler_private_IIR_FIR;
+        } else {
+            /* Default resampler */
+            S->resampler_function = silk_resampler_private_IIR_FIR;
+            up2 = 1;
+            if( Fs_Hz_in > 24000 ) {
+                /* Low-quality all-pass upsampler */
+                S->up2_function = silk_resampler_up2;
+            } else {
+                /* High-quality all-pass upsampler */
+                S->up2_function = silk_resampler_private_up2_HQ;
+            }
+        }
+    } else {
+        /* Input and output sampling rates are equal: copy */
+        S->resampler_function = silk_resampler_private_copy;
+    }
+
+    S->input2x = up2 | down2;
+
+    /* Ratio of input/output samples */
+    S->invRatio_Q16 = silk_LSHIFT32( silk_DIV32( silk_LSHIFT32( Fs_Hz_in, 14 + up2 - down2 ), Fs_Hz_out ), 2 );
+    /* Make sure the ratio is rounded up */
+    while( silk_SMULWW( S->invRatio_Q16, silk_LSHIFT32( Fs_Hz_out, down2 ) ) < silk_LSHIFT32( Fs_Hz_in, up2 ) ) {
+        S->invRatio_Q16++;
+    }
+
+    S->magic_number = 123456789;
+
+    return 0;
+}
+
+/* Clear the states of all resampling filters, without resetting sampling rate ratio */
+opus_int silk_resampler_clear(
+    silk_resampler_state_struct    *S            /* I/O: Resampler state             */
+)
+{
+    /* Clear state */
+    silk_memset( S->sDown2, 0, sizeof( S->sDown2 ) );
+    silk_memset( S->sIIR,   0, sizeof( S->sIIR ) );
+    silk_memset( S->sFIR,   0, sizeof( S->sFIR ) );
+#if RESAMPLER_SUPPORT_ABOVE_48KHZ
+    silk_memset( S->sDownPre, 0, sizeof( S->sDownPre ) );
+    silk_memset( S->sUpPost,  0, sizeof( S->sUpPost ) );
+#endif
+    return 0;
+}
+
+/* Resampler: convert from one sampling rate to another                                 */
+opus_int silk_resampler(
+    silk_resampler_state_struct    *S,                    /* I/O: Resampler state             */
+    opus_int16                            out[],        /* O:    Output signal                 */
+    const opus_int16                        in[],        /* I:    Input signal                */
+    opus_int32                            inLen        /* I:    Number of input samples        */
+)
+{
+    /* Verify that state was initialized and has not been corrupted */
+    if( S->magic_number != 123456789 ) {
+        silk_assert( 0 );
+        return -1;
+    }
+
+#if RESAMPLER_SUPPORT_ABOVE_48KHZ
+    if( S->nPreDownsamplers + S->nPostUpsamplers > 0 ) {
+        /* The input and/or output sampling rate is above 48000 Hz */
+        opus_int32       nSamplesIn, nSamplesOut;
+        opus_int16        in_buf[ 480 ], out_buf[ 480 ];
+
+        while( inLen > 0 ) {
+            /* Number of input and output samples to process */
+            nSamplesIn = silk_min( inLen, S->batchSizePrePost );
+            nSamplesOut = silk_SMULWB( S->ratio_Q16, nSamplesIn );
+
+            silk_assert( silk_RSHIFT32( nSamplesIn,  S->nPreDownsamplers ) <= 480 );
+            silk_assert( silk_RSHIFT32( nSamplesOut, S->nPostUpsamplers  ) <= 480 );
+
+            if( S->nPreDownsamplers > 0 ) {
+                S->down_pre_function( S->sDownPre, in_buf, in, nSamplesIn );
+                if( S->nPostUpsamplers > 0 ) {
+                    S->resampler_function( S, out_buf, in_buf, silk_RSHIFT32( nSamplesIn, S->nPreDownsamplers ) );
+                    S->up_post_function( S->sUpPost, out, out_buf, silk_RSHIFT32( nSamplesOut, S->nPostUpsamplers ) );
+                } else {
+                    S->resampler_function( S, out, in_buf, silk_RSHIFT32( nSamplesIn, S->nPreDownsamplers ) );
+                }
+            } else {
+                S->resampler_function( S, out_buf, in, silk_RSHIFT32( nSamplesIn, S->nPreDownsamplers ) );
+                S->up_post_function( S->sUpPost, out, out_buf, silk_RSHIFT32( nSamplesOut, S->nPostUpsamplers ) );
+            }
+
+            in += nSamplesIn;
+            out += nSamplesOut;
+            inLen -= nSamplesIn;
+        }
+    } else
+#endif
+    {
+        /* Input and output sampling rate are at most 48000 Hz */
+        S->resampler_function( S, out, in, inLen );
+    }
+
+    return 0;
+}