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 if (avctx
->channels
!= 1) {
101 av_log(avctx
, AV_LOG_ERROR
, "Only mono sound is supported (requested channels: %d).\n", avctx
->channels
);
102 return AVERROR_NOFMT
;
105 ff_acelp_weighted_vector_sum(fc
+ pitch_delay_int
[i
],
106 fc
+ pitch_delay_int
[i
],
108 av_clip(ctx
->gain_pitch
, SHARP_MIN
, SHARP_MAX
),
110 ctx
->subframe_size
- pitch_delay_int
[i
]);
112 if (ctx
->frame_erasure
) {
113 ctx
->gain_pitch
= (29491 * ctx
->gain_pitch
) >> 15; // 0.90 (0.15)
114 ctx
->gain_code
= ( 2007 * ctx
->gain_code
) >> 11; // 0.98 (0.11)
116 gain_corr_factor
= 0;
118 ctx
->gain_pitch
= cb_gain_1st_8k
[parm
->gc_1st_index
[i
]][0] +
119 cb_gain_2nd_8k
[parm
->gc_2nd_index
[i
]][0];
120 gain_corr_factor
= cb_gain_1st_8k
[parm
->gc_1st_index
[i
]][1] +
121 cb_gain_2nd_8k
[parm
->gc_2nd_index
[i
]][1];
123 ff_acelp_weighted_vector_sum(ctx
->exc
+ i
* ctx
->subframe_size
,
124 ctx
->exc
+ i
* ctx
->subframe_size
, fc
,
125 (!voicing
&& ctx
->frame_erasure
) ? 0 : ctx
->gain_pitch
,
126 ( voicing
&& ctx
->frame_erasure
) ? 0 : ctx
->gain_code
,
127 1<<13, 14, ctx
->subframe_size
);
129 if (buf_size
< packed_frame_size
) {
130 av_log(avctx
, AV_LOG_ERROR
, "Error processing packet: packet size too small\n");
133 if (*data_size
< unpacked_frame_size
) {
134 av_log(avctx
, AV_LOG_ERROR
, "Error processing packet: output buffer too small\n");
138 AVCodec g729_decoder
=
148 .long_name
= NULL_IF_CONFIG_SMALL("G.729"),