[FFmpeg-cvslog] r13244 - in trunk/libavcodec: acelp_vectors.c acelp_vectors.h
voroshil
subversion
Fri May 23 05:10:28 CEST 2008
Author: voroshil
Date: Fri May 23 05:10:27 2008
New Revision: 13244
Log:
adaptive and fixed codebook vector operations for ACELP-based codecs
Added:
trunk/libavcodec/acelp_vectors.c (contents, props changed)
trunk/libavcodec/acelp_vectors.h (contents, props changed)
Added: trunk/libavcodec/acelp_vectors.c
==============================================================================
--- (empty file)
+++ trunk/libavcodec/acelp_vectors.c Fri May 23 05:10:27 2008
@@ -0,0 +1,147 @@
+/*
+ * 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);
+}
Added: trunk/libavcodec/acelp_vectors.h
==============================================================================
--- (empty file)
+++ trunk/libavcodec/acelp_vectors.h Fri May 23 05:10:27 2008
@@ -0,0 +1,151 @@
+/*
+ * 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
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