adaptive and fixed codebook vector operations for ACELP-based codecs

Originally committed as revision 13244 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/acelp_vectors.c

+/*
+ * adaptive and fixed codebook vector operations 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 "acelp_vectors.h"
+
+const uint8_t ff_fc_2pulses_9bits_track1[16] =
+{
+    1,  3,
+    6,  8,
+    11, 13,
+    16, 18,
+    21, 23,
+    26, 28,
+    31, 33,
+    36, 38
+};
+const uint8_t ff_fc_2pulses_9bits_track1_gray[16] =
+{
+  1,  3,
+  8,  6,
+  18, 16,
+  11, 13,
+  38, 36,
+  31, 33,
+  21, 23,
+  28, 26,
+};
+
+const uint8_t ff_fc_2pulses_9bits_track2_gray[32] =
+{
+  0,  2,
+  5,  4,
+  12, 10,
+  7,  9,
+  25, 24,
+  20, 22,
+  14, 15,
+  19, 17,
+  36, 31,
+  21, 26,
+  1,  6,
+  16, 11,
+  27, 29,
+  32, 30,
+  39, 37,
+  34, 35,
+};
+
+const uint8_t ff_fc_4pulses_8bits_tracks_13[16] =
+{
+  0, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75,
+};
+
+const uint8_t ff_fc_4pulses_8bits_track_4[32] =
+{
+    3,  4,
+    8,  9,
+    13, 14,
+    18, 19,
+    23, 24,
+    28, 29,
+    33, 34,
+    38, 39,
+    43, 44,
+    48, 49,
+    53, 54,
+    58, 59,
+    63, 64,
+    68, 69,
+    73, 74,
+    78, 79,
+};
+
+#if 0
+static uint8_t gray_decode[32] =
+{
+    0,  1,  3,  2,  7,  6,  4,  5,
+   15, 14, 12, 13,  8,  9, 11, 10,
+   31, 30, 28, 29, 24, 25, 27, 26,
+   16, 17, 19, 18, 23, 22, 20, 21
+};
+#endif
+
+void ff_acelp_fc_pulse_per_track(
+        int16_t* fc_v,
+        const uint8_t *tab1,
+        const uint8_t *tab2,
+        int pulse_indices,
+        int pulse_signs,
+        int pulse_count,
+        int bits)
+{
+    int mask = (1 << bits) - 1;
+    int i;
+
+    for(i=0; i<pulse_count; i++)
+    {
+        fc_v[i + tab1[pulse_indices & mask]] +=
+                (pulse_signs & 1) ? 8191 : -8192; // +/-1 in (2.13)
+
+        pulse_indices >>= bits;
+        pulse_signs >>= 1;
+    }
+
+    fc_v[tab2[pulse_indices]] += (pulse_signs & 1) ? 8191 : -8192;
+}
+
+void ff_acelp_weighted_vector_sum(
+        int16_t* out,
+        const int16_t *in_a,
+        const int16_t *in_b,
+        int16_t weight_coeff_a,
+        int16_t weight_coeff_b,
+        int16_t rounder,
+        int shift,
+        int length)
+{
+    int i;
+
+    // Clipping required here; breaks OVERFLOW test.
+    for(i=0; i<length; i++)
+        out[i] = av_clip_int16((
+                 in_a[i] * weight_coeff_a +
+                 in_b[i] * weight_coeff_b +
+                 rounder) >> shift);
+}

libavcodec/acelp_vectors.h

+/*
+ * adaptive and fixed codebook vector operations 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
+ */
+
+#ifndef FFMPEG_ACELP_VECTORS_H
+#define FFMPEG_ACELP_VECTORS_H
+
+/*
+ * Track|Pulse|        Positions
+ * -------------------------------------------------------------------------
+ *  1   | 0   | 0, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75
+ * -------------------------------------------------------------------------
+ *  2   | 1   | 1, 6, 11, 16, 21, 26, 31, 36, 41, 46, 51, 56, 61, 66, 71, 76
+ * -------------------------------------------------------------------------
+ *  3   | 2   | 2, 7, 12, 17, 22, 27, 32, 37, 42, 47, 52, 57, 62, 67, 72, 77
+ * -------------------------------------------------------------------------
+ *
+ * Table contains only first the pulse indexes.
+ *
+ * Used in G.729 @8k, G.729 @4.4k, AMR @7.95k, AMR @7.40k
+ */
+extern const uint8_t ff_fc_4pulses_8bits_tracks_13[16];
+
+/*
+ * Track|Pulse|        Positions
+ * -------------------------------------------------------------------------
+ *  4   | 3   | 3, 8, 13, 18, 23, 28, 33, 38, 43, 48, 53, 58, 63, 68, 73, 78
+ *      |     | 4, 9, 14, 19, 24, 29, 34, 39, 44, 49, 54, 59, 64, 69, 74, 79
+ * -------------------------------------------------------------------------
+ *
+ * \remark Track in the table should be read top-to-bottom, left-to-right.
+ *
+ * Used in G.729 @8k, G.729 @4.4k, AMR @7.95k, AMR @7.40k
+ */
+extern const uint8_t ff_fc_4pulses_8bits_track_4[32];
+
+/*
+ * Track|Pulse|        Positions
+ * -----------------------------------------
+ *  1   | 0   | 1, 6, 11, 16, 21, 26, 31, 36
+ *      |     | 3, 8, 13, 18, 23, 28, 33, 38
+ * -----------------------------------------
+ *
+ * \remark Track in the table should be read top-to-bottom, left-to-right.
+ *
+ * \note (EE) Reference G.729D code also uses gray decoding for each
+ *            pulse index before looking up the value in the table.
+ *
+ * Used in G.729 @6.4k (with gray coding), AMD @5.9k (without gray coding)
+ */
+extern const uint8_t ff_fc_2pulses_9bits_track1[16];
+extern const uint8_t ff_fc_2pulses_9bits_track1_gray[16];
+
+/*
+ * Track|Pulse|        Positions
+ * -----------------------------------------
+ *  2   | 1   | 0, 7, 14, 20, 27, 34,  1, 21
+ *      |     | 2, 9, 15, 22, 29, 35,  6, 26
+ *      |     | 4,10, 17, 24, 30, 37, 11, 31
+ *      |     | 5,12, 19, 25, 32, 39, 16, 36
+ * -----------------------------------------
+ *
+ * \remark Track in the table should be read top-to-bottom, left-to-right.
+ *
+ * \note (EE.1) This table (from the reference code) does not comply with
+ *              the specification.
+ *              The specification contains the following table:
+ *
+ * Track|Pulse|        Positions
+ * -----------------------------------------
+ *  2   | 1   | 0, 5, 10, 15, 20, 25, 30, 35
+ *      |     | 1, 6, 11, 16, 21, 26, 31, 36
+ *      |     | 2, 7, 12, 17, 22, 27, 32, 37
+ *      |     | 4, 9, 14, 19, 24, 29, 34, 39
+ *
+ * -----------------------------------------
+ *
+ * \note (EE.2) Reference G.729D code also uses gray decoding for each
+ *              pulse index before looking up the value in the table.
+ *
+ * Used in G.729 @6.4k (with gray coding)
+ */
+extern const uint8_t ff_fc_2pulses_9bits_track2_gray[32];
+
+/**
+ * \brief Decode fixed-codebook vector (3.8 and D.5.8 of G.729, 5.7.1 of AMR).
+ * \param fc_v [out] decoded fixed codebook vector (2.13)
+ * \param tab1 table used for first pulse_count pulses
+ * \param tab2 table used for last pulse
+ * \param pulse_indices fixed codebook indeces
+ * \param pulse_signs signs of the excitation pulses (0 bit value
+ *                     means negative sign)
+ * \param bits number of bits per one pulse index
+ * \param pulse_count number of pulses decoded using first table
+ * \param bits length of one pulse index in bits
+ *
+ * Used in G.729 @8k, G.729 @4.4k, G.729 @6.4k, AMR @7.95k, AMR @7.40k
+ */
+void ff_acelp_fc_pulse_per_track(
+        int16_t* fc_v,
+        const uint8_t *tab1,
+        const uint8_t *tab2,
+        int pulse_indices,
+        int pulse_signs,
+        int pulse_count,
+        int bits);
+
+/**
+ * \brief weighted sum of two vectors with rounding
+ * \param out [out] result of addition
+ * \param in_a first vector
+ * \param in_b second vector
+ * \param weight_coeff_a first vector weight coefficient
+ * \param weight_coeff_a second vector weight coefficient
+ * \param rounder this value will be added to the sum of the two vectors
+ * \param shift result will be shifted to right by this value
+ * \param length vectors length
+ *
+ * \note It is safe to pass the same buffer for out and in_a or in_b.
+ *
+ *  out[i] = (in_a[i]*weight_a+in_b[i]*weight_b+rounder) >> shift
+ */
+void ff_acelp_weighted_vector_sum(
+        int16_t* out,
+        const int16_t *in_a,
+        const int16_t *in_b,
+        int16_t weight_coeff_a,
+        int16_t weight_coeff_b,
+        int16_t rounder,
+        int shift,
+        int length);
+
+#endif // FFMPEG_ACELP_VECTORS_H