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1 | /* |
2 | * TwinVQ decoder | |
3 | * Copyright (c) 2009 Vitor Sessak | |
4 | * | |
5 | * This file is part of FFmpeg. | |
6 | * | |
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. | |
11 | * | |
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. | |
16 | * | |
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 | |
20 | */ | |
21 | ||
22 | #ifndef AVCODEC_TWINVQ_H | |
23 | #define AVCODEC_TWINVQ_H | |
24 | ||
25 | #include <math.h> | |
26 | #include <stdint.h> | |
27 | ||
28 | #include "libavutil/common.h" | |
29 | #include "libavutil/float_dsp.h" | |
30 | #include "avcodec.h" | |
31 | #include "fft.h" | |
32 | #include "internal.h" | |
33 | ||
34 | enum TwinVQCodec { | |
35 | TWINVQ_CODEC_VQF, | |
36 | TWINVQ_CODEC_METASOUND, | |
37 | }; | |
38 | ||
39 | enum TwinVQFrameType { | |
40 | TWINVQ_FT_SHORT = 0, ///< Short frame (divided in n sub-blocks) | |
41 | TWINVQ_FT_MEDIUM, ///< Medium frame (divided in m<n sub-blocks) | |
42 | TWINVQ_FT_LONG, ///< Long frame (single sub-block + PPC) | |
43 | TWINVQ_FT_PPC, ///< Periodic Peak Component (part of the long frame) | |
44 | }; | |
45 | ||
46 | #define TWINVQ_PPC_SHAPE_CB_SIZE 64 | |
47 | #define TWINVQ_PPC_SHAPE_LEN_MAX 60 | |
48 | #define TWINVQ_SUB_AMP_MAX 4500.0 | |
49 | #define TWINVQ_MULAW_MU 100.0 | |
50 | #define TWINVQ_GAIN_BITS 8 | |
51 | #define TWINVQ_AMP_MAX 13000.0 | |
52 | #define TWINVQ_SUB_GAIN_BITS 5 | |
53 | #define TWINVQ_WINDOW_TYPE_BITS 4 | |
54 | #define TWINVQ_PGAIN_MU 200 | |
55 | #define TWINVQ_LSP_COEFS_MAX 20 | |
56 | #define TWINVQ_LSP_SPLIT_MAX 4 | |
57 | #define TWINVQ_CHANNELS_MAX 2 | |
58 | #define TWINVQ_SUBBLOCKS_MAX 16 | |
59 | #define TWINVQ_BARK_N_COEF_MAX 4 | |
60 | ||
61 | #define TWINVQ_MAX_FRAMES_PER_PACKET 2 | |
62 | ||
63 | /** | |
64 | * Parameters and tables that are different for each frame type | |
65 | */ | |
66 | struct TwinVQFrameMode { | |
67 | uint8_t sub; ///< Number subblocks in each frame | |
68 | const uint16_t *bark_tab; | |
69 | ||
70 | /** number of distinct bark scale envelope values */ | |
71 | uint8_t bark_env_size; | |
72 | ||
73 | const int16_t *bark_cb; ///< codebook for the bark scale envelope (BSE) | |
74 | uint8_t bark_n_coef;///< number of BSE CB coefficients to read | |
75 | uint8_t bark_n_bit; ///< number of bits of the BSE coefs | |
76 | ||
77 | //@{ | |
78 | /** main codebooks for spectrum data */ | |
79 | const int16_t *cb0; | |
80 | const int16_t *cb1; | |
81 | //@} | |
82 | ||
83 | uint8_t cb_len_read; ///< number of spectrum coefficients to read | |
84 | }; | |
85 | ||
86 | typedef struct TwinVQFrameData { | |
87 | int window_type; | |
88 | enum TwinVQFrameType ftype; | |
89 | ||
90 | uint8_t main_coeffs[1024]; | |
91 | uint8_t ppc_coeffs[TWINVQ_PPC_SHAPE_LEN_MAX]; | |
92 | ||
93 | uint8_t gain_bits[TWINVQ_CHANNELS_MAX]; | |
94 | uint8_t sub_gain_bits[TWINVQ_CHANNELS_MAX * TWINVQ_SUBBLOCKS_MAX]; | |
95 | ||
96 | uint8_t bark1[TWINVQ_CHANNELS_MAX][TWINVQ_SUBBLOCKS_MAX][TWINVQ_BARK_N_COEF_MAX]; | |
97 | uint8_t bark_use_hist[TWINVQ_CHANNELS_MAX][TWINVQ_SUBBLOCKS_MAX]; | |
98 | ||
99 | uint8_t lpc_idx1[TWINVQ_CHANNELS_MAX]; | |
100 | uint8_t lpc_idx2[TWINVQ_CHANNELS_MAX][TWINVQ_LSP_SPLIT_MAX]; | |
101 | uint8_t lpc_hist_idx[TWINVQ_CHANNELS_MAX]; | |
102 | ||
103 | int p_coef[TWINVQ_CHANNELS_MAX]; | |
104 | int g_coef[TWINVQ_CHANNELS_MAX]; | |
105 | } TwinVQFrameData; | |
106 | ||
107 | /** | |
108 | * Parameters and tables that are different for every combination of | |
109 | * bitrate/sample rate | |
110 | */ | |
111 | typedef struct TwinVQModeTab { | |
112 | struct TwinVQFrameMode fmode[3]; ///< frame type-dependant parameters | |
113 | ||
114 | uint16_t size; ///< frame size in samples | |
115 | uint8_t n_lsp; ///< number of lsp coefficients | |
116 | const float *lspcodebook; | |
117 | ||
118 | /* number of bits of the different LSP CB coefficients */ | |
119 | uint8_t lsp_bit0; | |
120 | uint8_t lsp_bit1; | |
121 | uint8_t lsp_bit2; | |
122 | ||
123 | uint8_t lsp_split; ///< number of CB entries for the LSP decoding | |
124 | const int16_t *ppc_shape_cb; ///< PPC shape CB | |
125 | ||
126 | /** number of the bits for the PPC period value */ | |
127 | uint8_t ppc_period_bit; | |
128 | ||
129 | uint8_t ppc_shape_bit; ///< number of bits of the PPC shape CB coeffs | |
130 | uint8_t ppc_shape_len; ///< size of PPC shape CB | |
131 | uint8_t pgain_bit; ///< bits for PPC gain | |
132 | ||
133 | /** constant for peak period to peak width conversion */ | |
134 | uint16_t peak_per2wid; | |
135 | } TwinVQModeTab; | |
136 | ||
137 | typedef struct TwinVQContext { | |
138 | AVCodecContext *avctx; | |
f6fa7814 | 139 | AVFloatDSPContext *fdsp; |
2ba45a60 DM |
140 | FFTContext mdct_ctx[3]; |
141 | ||
142 | const TwinVQModeTab *mtab; | |
143 | ||
144 | int is_6kbps; | |
145 | ||
146 | // history | |
147 | float lsp_hist[2][20]; ///< LSP coefficients of the last frame | |
148 | float bark_hist[3][2][40]; ///< BSE coefficients of last frame | |
149 | ||
150 | // bitstream parameters | |
151 | int16_t permut[4][4096]; | |
152 | uint8_t length[4][2]; ///< main codebook stride | |
153 | uint8_t length_change[4]; | |
154 | uint8_t bits_main_spec[2][4][2]; ///< bits for the main codebook | |
155 | int bits_main_spec_change[4]; | |
156 | int n_div[4]; | |
157 | ||
158 | float *spectrum; | |
159 | float *curr_frame; ///< non-interleaved output | |
160 | float *prev_frame; ///< non-interleaved previous frame | |
161 | int last_block_pos[2]; | |
162 | int discarded_packets; | |
163 | ||
164 | float *cos_tabs[3]; | |
165 | ||
166 | // scratch buffers | |
167 | float *tmp_buf; | |
168 | ||
169 | int frame_size, frames_per_packet, cur_frame; | |
170 | TwinVQFrameData bits[TWINVQ_MAX_FRAMES_PER_PACKET]; | |
171 | ||
172 | enum TwinVQCodec codec; | |
173 | ||
174 | int (*read_bitstream)(AVCodecContext *avctx, struct TwinVQContext *tctx, | |
175 | const uint8_t *buf, int buf_size); | |
176 | void (*dec_bark_env)(struct TwinVQContext *tctx, const uint8_t *in, | |
177 | int use_hist, int ch, float *out, float gain, | |
178 | enum TwinVQFrameType ftype); | |
179 | void (*decode_ppc)(struct TwinVQContext *tctx, int period_coef, int g_coef, | |
180 | const float *shape, float *speech); | |
181 | } TwinVQContext; | |
182 | ||
183 | extern const enum TwinVQFrameType ff_twinvq_wtype_to_ftype_table[]; | |
184 | ||
185 | /** @note not speed critical, hence not optimized */ | |
186 | static inline void twinvq_memset_float(float *buf, float val, int size) | |
187 | { | |
188 | while (size--) | |
189 | *buf++ = val; | |
190 | } | |
191 | ||
192 | static inline float twinvq_mulawinv(float y, float clip, float mu) | |
193 | { | |
194 | y = av_clipf(y / clip, -1, 1); | |
195 | return clip * FFSIGN(y) * (exp(log(1 + mu) * fabs(y)) - 1) / mu; | |
196 | } | |
197 | ||
198 | int ff_twinvq_decode_frame(AVCodecContext *avctx, void *data, | |
199 | int *got_frame_ptr, AVPacket *avpkt); | |
200 | av_cold int ff_twinvq_decode_close(AVCodecContext *avctx); | |
201 | av_cold int ff_twinvq_decode_init(AVCodecContext *avctx); | |
202 | ||
203 | #endif /* AVCODEC_TWINVQ_DATA_H */ |