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"
35 #include "celp_math.h"
36 #include "acelp_filters.h"
37 #include "acelp_pitch_delay.h"
38 #include "acelp_vectors.h"
42 * minimum quantized LSF value (3.2.4)
48 * maximum quantized LSF value (3.2.4)
51 #define LSFQ_MAX 25681
54 * minimum LSF distance (3.2.4)
57 #define LSFQ_DIFF_MIN 321
60 * minimum gain pitch value (3.8, Equation 47)
63 #define SHARP_MIN 3277
66 * maximum gain pitch value (3.8, Equation 47)
67 * (EE) This does not comply with the specification.
68 * Specification says about 0.8, which should be
69 * 13107 in (1.14), but reference C code uses
70 * 13017 (equals to 0.7945) instead of it.
72 #define SHARP_MAX 13017
76 uint8_t packed_frame_size; ///< input frame size(in bytes)
77 uint8_t unpacked_frame_size;///< output frame size (in bytes)
78 uint8_t fc_indexes_bits; ///< size (in bits) of fixed-codebook index entry
80 /// mr_energy = mean_energy + 10 * log10(2^26 * subframe_size) in (7.13)
82 } G729FormatDescription;
85 * \brief pseudo random number generator
87 static inline uint16_t g729_prng(uint16_t value)
89 return 31821 * value + 13849;
93 * Get parity bit of bit 2..7
95 static inline int get_parity(uint8_t value)
97 return (0x6996966996696996ULL >> (value >> 2)) & 1;
100 static av_cold int decoder_init(AVCodecContext * avctx)
102 if (avctx->channels != 1) {
103 av_log(avctx, AV_LOG_ERROR, "Only mono sound is supported (requested channels: %d).\n", avctx->channels);
104 return AVERROR_NOFMT;
107 /* Both 8kbit/s and 6.4kbit/s modes uses two subframes per frame. */
108 avctx->frame_size = SUBFRAME_SIZE << 1;
113 ff_acelp_weighted_vector_sum(fc + pitch_delay_int[i],
114 fc + pitch_delay_int[i],
116 av_clip(ctx->gain_pitch, SHARP_MIN, SHARP_MAX),
118 SUBFRAME_SIZE - pitch_delay_int[i]);
120 if (ctx->frame_erasure) {
121 ctx->gain_pitch = (29491 * ctx->gain_pitch) >> 15; // 0.90 (0.15)
122 ctx->gain_code = ( 2007 * ctx->gain_code ) >> 11; // 0.98 (0.11)
124 gain_corr_factor = 0;
126 ctx->gain_pitch = cb_gain_1st_8k[parm->gc_1st_index[i]][0] +
127 cb_gain_2nd_8k[parm->gc_2nd_index[i]][0];
128 gain_corr_factor = cb_gain_1st_8k[parm->gc_1st_index[i]][1] +
129 cb_gain_2nd_8k[parm->gc_2nd_index[i]][1];
131 ff_acelp_weighted_vector_sum(ctx->exc + i * SUBFRAME_SIZE,
132 ctx->exc + i * SUBFRAME_SIZE, fc,
133 (!voicing && ctx->frame_erasure) ? 0 : ctx->gain_pitch,
134 ( voicing && ctx->frame_erasure) ? 0 : ctx->gain_code,
135 1 << 13, 14, SUBFRAME_SIZE);
137 if (buf_size < packed_frame_size) {
138 av_log(avctx, AV_LOG_ERROR, "Error processing packet: packet size too small\n");
141 if (*data_size < unpacked_frame_size) {
142 av_log(avctx, AV_LOG_ERROR, "Error processing packet: output buffer too small\n");
146 AVCodec g729_decoder =
156 .long_name = NULL_IF_CONFIG_SMALL("G.729"),