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"
35 #include "acelp_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
77 uint8_t packed_frame_size; ///< input frame size(in bytes)
78 uint8_t unpacked_frame_size;///< output frame size (in bytes)
79 uint8_t fc_indexes_bits; ///< size (in bits) of fixed-codebook index entry
81 /// mr_energy = mean_energy + 10 * log10(2^26 * subframe_size) in (7.13)
83 } G729_format_description;
86 * \brief pseudo random number generator
88 static inline uint16_t g729_random(uint16_t value)
90 return 31821 * value + 13849;
94 * Get parity bit of bit 2..7
96 static inline int g729_get_parity(uint8_t value)
98 return (0x6996966996696996ULL >> (value >> 2)) & 1;
101 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 ff_acelp_weighted_vector_sum(
108 fc + pitch_delay_int[i],
109 fc + pitch_delay_int[i],
112 av_clip(ctx->gain_pitch, SHARP_MIN, SHARP_MAX),
115 ctx->subframe_size - pitch_delay_int[i]);
117 if(ctx->frame_erasure)
119 ctx->gain_pitch = (29491 * ctx->gain_pitch) >> 15; // 0.9 (0.15)
120 ctx->gain_code = (2007 * ctx->gain_code) >> 11; // 0.98 in (0.11)
122 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(
132 ctx->exc + i * ctx->subframe_size,
133 ctx->exc + i * ctx->subframe_size,
135 (!voicing && ctx->frame_erasure) ? 0 : ctx->gain_pitch,
136 ( voicing && ctx->frame_erasure) ? 0 : ctx->gain_code,
141 if (buf_size<packed_frame_size)
143 av_log(avctx, AV_LOG_ERROR, "Error processing packet: packet size too small\n");
146 if (*data_size<unpacked_frame_size)
148 av_log(avctx, AV_LOG_ERROR, "Error processing packet: output buffer too small\n");
152 AVCodec g729_decoder =
157 sizeof(G729_Context),
158 ff_g729_decoder_init,
161 ff_g729_decode_frame,
162 .long_name = NULL_IF_CONFIG_SMALL("G.729"),