Merge branch 'mirror' into vdpau
[FFMpeg-mirror/ffmpeg-vdpau.git] / libavcodec / g729dec.c
blob5a0bd16df0ab269a84287c335b6406d30a317cc5
1 /*
2 * G.729 decoder
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
21 #include <stdlib.h>
22 #include <inttypes.h>
23 #include <limits.h>
24 #include <stdio.h>
25 #include <string.h>
26 #include <math.h>
27 #include <assert.h>
29 #include "avcodec.h"
30 #include "libavutil/avutil.h"
31 #include "bitstream.h"
33 #include "g729.h"
34 #include "lsp.h"
35 #include "celp_math.h"
36 #include "acelp_filters.h"
37 #include "acelp_pitch_delay.h"
38 #include "acelp_vectors.h"
39 #include "g729data.h"
41 /**
42 * minimum quantized LSF value (3.2.4)
43 * 0.005 in Q13
45 #define LSFQ_MIN 40
47 /**
48 * maximum quantized LSF value (3.2.4)
49 * 3.135 in Q13
51 #define LSFQ_MAX 25681
53 /**
54 * minimum LSF distance (3.2.4)
55 * 0.0391 in Q13
57 #define LSFQ_DIFF_MIN 321
59 /**
60 * minimum gain pitch value (3.8, Equation 47)
61 * 0.2 in (1.14)
63 #define SHARP_MIN 3277
65 /**
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
74 typedef struct
76 int sample_rate;
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)
82 int mr_energy;
83 } G729_format_description;
85 /**
86 * \brief pseudo random number generator
88 static inline uint16_t g729_random(uint16_t value)
90 return 31821 * value + 13849;
93 /**
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],
111 1 << 14,
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;
124 else
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,
137 1<<13,
139 ctx->subframe_size);
141 if (buf_size<packed_frame_size)
143 av_log(avctx, AV_LOG_ERROR, "Error processing packet: packet size too small\n");
144 return AVERROR(EIO);
146 if (*data_size<unpacked_frame_size)
148 av_log(avctx, AV_LOG_ERROR, "Error processing packet: output buffer too small\n");
149 return AVERROR(EIO);
152 AVCodec g729_decoder =
154 "g729",
155 CODEC_TYPE_AUDIO,
156 CODEC_ID_G729,
157 sizeof(G729_Context),
158 ff_g729_decoder_init,
159 NULL,
160 NULL,
161 ff_g729_decode_frame,
162 .long_name = NULL_IF_CONFIG_SMALL("G.729"),