From 5b2729cd0bfebbcda403dbb1f9906773dbb9b186 Mon Sep 17 00:00:00 2001 From: Vladimir Voroshilov Date: Fri, 23 May 2008 03:10:27 +0000 Subject: 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.h | 151 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 151 insertions(+) create mode 100644 libavcodec/acelp_vectors.h (limited to 'libavcodec/acelp_vectors.h') diff --git a/libavcodec/acelp_vectors.h b/libavcodec/acelp_vectors.h new file mode 100644 index 0000000000..be1ed2c0d6 --- /dev/null +++ b/libavcodec/acelp_vectors.h @@ -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 -- cgit v1.2.3