3 * Copyright (c) 2008 Vladimir Voroshilov
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
30 #include "libavutil/avutil.h"
31 #include "bitstream.h"
34 * minimum quantized LSF value (3.2.4)
40 * maximum quantized LSF value (3.2.4)
43 #define LSFQ_MAX 25681
46 * minimum LSF distance (3.2.4)
49 #define LSFQ_DIFF_MIN 321
52 * minimum gain pitch value (3.8, Equation 47)
55 #define SHARP_MIN 3277
58 * maximum gain pitch value (3.8, Equation 47)
59 * (EE) This does not comply with the specification.
60 * Specification says about 0.8, which should be
61 * 13107 in (1.14), but reference C code uses
62 * 13017 (equals to 0.7945) instead of it.
64 #define SHARP_MAX 13017
67 * \brief pseudo random number generator
69 static inline uint16_t g729_random(uint16_t value)
71 return 31821 * value + 13849;
75 * Get parity bit of bit 2..7
77 static inline int g729_get_parity(uint8_t value)
79 return (0x6996966996696996ULL >> (value >> 2)) & 1;
82 ff_acelp_weighted_vector_sum(
83 fc + pitch_delay_int[i],
84 fc + pitch_delay_int[i],
87 av_clip(ctx->gain_pitch, SHARP_MIN, SHARP_MAX),
90 ctx->subframe_size - pitch_delay_int[i]);
92 ctx->gain_pitch = cb_gain_1st_8k[parm->gc_1st_index[i]][0] +
93 cb_gain_2nd_8k[parm->gc_2nd_index[i]][0];
94 gain_corr_factor = cb_gain_1st_8k[parm->gc_1st_index[i]][1] +
95 cb_gain_2nd_8k[parm->gc_2nd_index[i]][1];
97 ff_acelp_weighted_vector_sum(
98 ctx->exc + i * ctx->subframe_size,
99 ctx->exc + i * ctx->subframe_size,
101 (!voicing && ctx->frame_erasure) ? 0 : ctx->gain_pitch,
102 ( voicing && ctx->frame_erasure) ? 0 : ctx->gain_code,
107 AVCodec g729_decoder =
112 sizeof(G729_Context),
113 ff_g729_decoder_init,
116 ff_g729_decode_frame,
117 .long_name = NULL_IF_CONFIG_SMALL("G.729"),