Split off celp_filters.[ch] from acelp_filters.[ch] for the QCELP decoder.

patch by Kenan Gillet, kenan.gillet gmail com

Originally committed as revision 15680 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/Makefile

@@ -156,7 +156,7 @@ OBJS-$(CONFIG_QDRAW_DECODER)           += qdrw.o
 OBJS-$(CONFIG_QPEG_DECODER)            += qpeg.o
 OBJS-$(CONFIG_QTRLE_DECODER)           += qtrle.o
 OBJS-$(CONFIG_QTRLE_ENCODER)           += qtrleenc.o
-OBJS-$(CONFIG_RA_144_DECODER)          += ra144.o acelp_filters.o
+OBJS-$(CONFIG_RA_144_DECODER)          += ra144.o celp_filters.o
 OBJS-$(CONFIG_RA_288_DECODER)          += ra288.o
 OBJS-$(CONFIG_RAWVIDEO_DECODER)        += rawdec.o
 OBJS-$(CONFIG_RAWVIDEO_ENCODER)        += rawenc.o

libavcodec/acelp_filters.c

@@ -81,65 +81,6 @@ void ff_acelp_interpolate(
     }
 }
 
-void ff_acelp_convolve_circ(
-        int16_t* fc_out,
-        const int16_t* fc_in,
-        const int16_t* filter,
-        int len)
-{
-    int i, k;
-
-    memset(fc_out, 0, len * sizeof(int16_t));
-
-    /* Since there are few pulses over an entire subframe (i.e. almost
-       all fc_in[i] are zero) it is faster to loop over fc_in first. */
-    for(i=0; i<len; i++)
-    {
-        if(fc_in[i])
-        {
-            for(k=0; k<i; k++)
-                fc_out[k] += (fc_in[i] * filter[len + k - i]) >> 15;
-
-            for(k=i; k<len; k++)
-                fc_out[k] += (fc_in[i] * filter[      k - i]) >> 15;
-        }
-    }
-}
-
-int ff_acelp_lp_synthesis_filter(
-        int16_t *out,
-        const int16_t* filter_coeffs,
-        const int16_t* in,
-        int buffer_length,
-        int filter_length,
-        int stop_on_overflow,
-        int rounder)
-{
-    int i,n;
-
-    // These two lines are to avoid a -1 subtraction in the main loop
-    filter_length++;
-    filter_coeffs--;
-
-    for(n=0; n<buffer_length; n++)
-    {
-        int sum = rounder;
-        for(i=1; i<filter_length; i++)
-            sum -= filter_coeffs[i] * out[n-i];
-
-        sum = (sum >> 12) + in[n];
-
-        if(sum + 0x8000 > 0xFFFFU)
-        {
-            if(stop_on_overflow)
-                return 1;
-            sum = (sum >> 31) ^ 32767;
-        }
-        out[n] = sum;
-    }
-
-    return 0;
-}
 
 void ff_acelp_high_pass_filter(
         int16_t* out,

libavcodec/acelp_filters.h

@@ -60,50 +60,6 @@ void ff_acelp_interpolate(
         int filter_length,
         int length);
 
-/**
- * Circularly convolve fixed vector with a phase dispersion impulse
- *        response filter (D.6.2 of G.729 and 6.1.5 of AMR).
- * @param fc_out vector with filter applied
- * @param fc_in source vector
- * @param filter phase filter coefficients
- *
- *  fc_out[n] = sum(i,0,len-1){ fc_in[i] * filter[(len + n - i)%len] }
- *
- * \note fc_in and fc_out should not overlap!
- */
-void ff_acelp_convolve_circ(
-        int16_t* fc_out,
-        const int16_t* fc_in,
-        const int16_t* filter,
-        int len);
-
-/**
- * LP synthesis filter.
- * @param out [out] pointer to output buffer
- * @param filter_coeffs filter coefficients (-0x8000 <= (3.12) < 0x8000)
- * @param in input signal
- * @param buffer_length amount of data to process
- * @param filter_length filter length (10 for 10th order LP filter)
- * @param stop_on_overflow   1 - return immediately if overflow occurs
- *                           0 - ignore overflows
- * @param rounder the amount to add for rounding (usually 0x800 or 0xfff)
- *
- * @return 1 if overflow occurred, 0 - otherwise
- *
- * @note Output buffer must contain 10 samples of past
- *       speech data before pointer.
- *
- * Routine applies 1/A(z) filter to given speech data.
- */
-int ff_acelp_lp_synthesis_filter(
-        int16_t *out,
-        const int16_t* filter_coeffs,
-        const int16_t* in,
-        int buffer_length,
-        int filter_length,
-        int stop_on_overflow,
-        int rounder);
-
 
 /**
  * high-pass filtering and upscaling (4.2.5 of G.729).

libavcodec/celp_filters.c

@@ -0,0 +1,86 @@
+/*
+ * various filters for ACELP-based codecs
+ *
+ * Copyright (c) 2008 Vladimir Voroshilov
+ *
+ * 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
+ */
+
+#include <inttypes.h>
+
+#include "avcodec.h"
+#include "celp_filters.h"
+
+void ff_celp_convolve_circ(
+        int16_t* fc_out,
+        const int16_t* fc_in,
+        const int16_t* filter,
+        int len)
+{
+    int i, k;
+
+    memset(fc_out, 0, len * sizeof(int16_t));
+
+    /* Since there are few pulses over an entire subframe (i.e. almost
+       all fc_in[i] are zero) it is faster to loop over fc_in first. */
+    for(i=0; i<len; i++)
+    {
+        if(fc_in[i])
+        {
+            for(k=0; k<i; k++)
+                fc_out[k] += (fc_in[i] * filter[len + k - i]) >> 15;
+
+            for(k=i; k<len; k++)
+                fc_out[k] += (fc_in[i] * filter[      k - i]) >> 15;
+        }
+    }
+}
+
+int ff_celp_lp_synthesis_filter(
+        int16_t *out,
+        const int16_t* filter_coeffs,
+        const int16_t* in,
+        int buffer_length,
+        int filter_length,
+        int stop_on_overflow,
+        int rounder)
+{
+    int i,n;
+
+    // These two lines are to avoid a -1 subtraction in the main loop
+    filter_length++;
+    filter_coeffs--;
+
+    for(n=0; n<buffer_length; n++)
+    {
+        int sum = rounder;
+        for(i=1; i<filter_length; i++)
+            sum -= filter_coeffs[i] * out[n-i];
+
+        sum = (sum >> 12) + in[n];
+
+        if(sum + 0x8000 > 0xFFFFU)
+        {
+            if(stop_on_overflow)
+                return 1;
+            sum = (sum >> 31) ^ 32767;
+        }
+        out[n] = sum;
+    }
+
+    return 0;
+}

libavcodec/celp_filters.h

@@ -0,0 +1,72 @@
+/*
+ * various filters for CELP-based codecs
+ *
+ * Copyright (c) 2008 Vladimir Voroshilov
+ *
+ * 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
+ */
+
+#ifndef AVCODEC_CELP_FILTERS_H
+#define AVCODEC_CELP_FILTERS_H
+
+#include <stdint.h>
+
+/**
+ * Circularly convolve fixed vector with a phase dispersion impulse
+ *        response filter (D.6.2 of G.729 and 6.1.5 of AMR).
+ * @param fc_out vector with filter applied
+ * @param fc_in source vector
+ * @param filter phase filter coefficients
+ *
+ *  fc_out[n] = sum(i,0,len-1){ fc_in[i] * filter[(len + n - i)%len] }
+ *
+ * \note fc_in and fc_out should not overlap!
+ */
+void ff_celp_convolve_circ(
+        int16_t* fc_out,
+        const int16_t* fc_in,
+        const int16_t* filter,
+        int len);
+
+/**
+ * LP synthesis filter.
+ * @param out [out] pointer to output buffer
+ * @param filter_coeffs filter coefficients (-0x8000 <= (3.12) < 0x8000)
+ * @param in input signal
+ * @param buffer_length amount of data to process
+ * @param filter_length filter length (10 for 10th order LP filter)
+ * @param stop_on_overflow   1 - return immediately if overflow occurs
+ *                           0 - ignore overflows
+ * @param rounder the amount to add for rounding (usually 0x800 or 0xfff)
+ *
+ * @return 1 if overflow occurred, 0 - otherwise
+ *
+ * @note Output buffer must contain 10 samples of past
+ *       speech data before pointer.
+ *
+ * Routine applies 1/A(z) filter to given speech data.
+ */
+int ff_celp_lp_synthesis_filter(
+        int16_t *out,
+        const int16_t* filter_coeffs,
+        const int16_t* in,
+        int buffer_length,
+        int filter_length,
+        int stop_on_overflow,
+        int rounder);
+
+#endif /* AVCODEC_CELP_FILTERS_H */

libavcodec/ra144.c

@@ -25,7 +25,7 @@
 #include "avcodec.h"
 #include "bitstream.h"
 #include "ra144.h"
-#include "acelp_filters.h"
+#include "celp_filters.h"
 
 #define NBLOCKS         4       ///< number of subblocks within a block
 #define BLOCKSIZE       40      ///< subblock size in 16-bit words
@@ -201,8 +201,8 @@ static void do_output_subblock(RA144Context *ractx, const uint16_t  *lpc_coefs,
     memcpy(ractx->curr_sblock, ractx->curr_sblock + 40,
            10*sizeof(*ractx->curr_sblock));
 
-    if (ff_acelp_lp_synthesis_filter(ractx->curr_sblock + 10, lpc_coefs,
-                                     block, BLOCKSIZE, 10, 1, 0xfff))
+    if (ff_celp_lp_synthesis_filter(ractx->curr_sblock + 10, lpc_coefs,
+                                    block, BLOCKSIZE, 10, 1, 0xfff))
         memset(ractx->curr_sblock, 0, 50*sizeof(*ractx->curr_sblock));
 }