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Diffstat (limited to 'apps/codecs/libwma/wmadec.h')
-rw-r--r-- | apps/codecs/libwma/wmadec.h | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/apps/codecs/libwma/wmadec.h b/apps/codecs/libwma/wmadec.h new file mode 100644 index 0000000000..89c100daba --- /dev/null +++ b/apps/codecs/libwma/wmadec.h | |||
@@ -0,0 +1,162 @@ | |||
1 | #ifndef _WMADEC_H | ||
2 | #define _WMADEC_H | ||
3 | |||
4 | #include "asf.h" | ||
5 | #include "common.h" /* For GetBitContext */ | ||
6 | //#include "dsputil.h" /* For MDCTContext */ | ||
7 | |||
8 | |||
9 | //#define TRACE | ||
10 | /* size of blocks */ | ||
11 | #define BLOCK_MIN_BITS 7 | ||
12 | #define BLOCK_MAX_BITS 11 | ||
13 | #define BLOCK_MAX_SIZE (1 << BLOCK_MAX_BITS) | ||
14 | |||
15 | #define BLOCK_NB_SIZES (BLOCK_MAX_BITS - BLOCK_MIN_BITS + 1) | ||
16 | |||
17 | /* XXX: find exact max size */ | ||
18 | #define HIGH_BAND_MAX_SIZE 16 | ||
19 | |||
20 | #define NB_LSP_COEFS 10 | ||
21 | |||
22 | /* XXX: is it a suitable value ? */ | ||
23 | #define MAX_CODED_SUPERFRAME_SIZE 16384 | ||
24 | |||
25 | #define M_PI 3.14159265358979323846 | ||
26 | |||
27 | #define M_PI_F 0x3243f // in fixed 32 format | ||
28 | #define TWO_M_PI_F 0x6487f //in fixed 32 | ||
29 | |||
30 | #define MAX_CHANNELS 2 | ||
31 | |||
32 | #define NOISE_TAB_SIZE 8192 | ||
33 | |||
34 | #define LSP_POW_BITS 7 | ||
35 | |||
36 | #define VLC_TYPE int16_t | ||
37 | |||
38 | typedef struct VLC | ||
39 | { | ||
40 | int bits; | ||
41 | VLC_TYPE (*table)[2]; ///< code, bits | ||
42 | int table_size, table_allocated; | ||
43 | } | ||
44 | VLC; | ||
45 | |||
46 | #define fixed32 int32_t | ||
47 | #define fixed64 int64_t | ||
48 | |||
49 | typedef fixed32 FFTSample; | ||
50 | |||
51 | typedef struct FFTComplex | ||
52 | { | ||
53 | fixed32 re, im; | ||
54 | } | ||
55 | FFTComplex; | ||
56 | |||
57 | typedef struct FFTContext | ||
58 | { | ||
59 | int nbits; | ||
60 | int inverse; | ||
61 | uint16_t *revtab; | ||
62 | FFTComplex *exptab; | ||
63 | FFTComplex *exptab1; /* only used by SSE code */ | ||
64 | int (*fft_calc)(struct FFTContext *s, FFTComplex *z); | ||
65 | } | ||
66 | FFTContext; | ||
67 | |||
68 | typedef struct MDCTContext | ||
69 | { | ||
70 | int n; /* size of MDCT (i.e. number of input data * 2) */ | ||
71 | int nbits; /* n = 2^nbits */ | ||
72 | /* pre/post rotation tables */ | ||
73 | fixed32 *tcos; | ||
74 | fixed32 *tsin; | ||
75 | FFTContext fft; | ||
76 | } | ||
77 | MDCTContext; | ||
78 | |||
79 | typedef struct WMADecodeContext | ||
80 | { | ||
81 | GetBitContext gb; | ||
82 | |||
83 | int nb_block_sizes; /* number of block sizes */ | ||
84 | |||
85 | int sample_rate; | ||
86 | int nb_channels; | ||
87 | int bit_rate; | ||
88 | int version; /* 1 = 0x160 (WMAV1), 2 = 0x161 (WMAV2) */ | ||
89 | int block_align; | ||
90 | int use_bit_reservoir; | ||
91 | int use_variable_block_len; | ||
92 | int use_exp_vlc; /* exponent coding: 0 = lsp, 1 = vlc + delta */ | ||
93 | int use_noise_coding; /* true if perceptual noise is added */ | ||
94 | int byte_offset_bits; | ||
95 | VLC exp_vlc; | ||
96 | int exponent_sizes[BLOCK_NB_SIZES]; | ||
97 | uint16_t exponent_bands[BLOCK_NB_SIZES][25]; | ||
98 | int high_band_start[BLOCK_NB_SIZES]; /* index of first coef in high band */ | ||
99 | int coefs_start; /* first coded coef */ | ||
100 | int coefs_end[BLOCK_NB_SIZES]; /* max number of coded coefficients */ | ||
101 | int exponent_high_sizes[BLOCK_NB_SIZES]; | ||
102 | int exponent_high_bands[BLOCK_NB_SIZES][HIGH_BAND_MAX_SIZE]; | ||
103 | VLC hgain_vlc; | ||
104 | |||
105 | /* coded values in high bands */ | ||
106 | int high_band_coded[MAX_CHANNELS][HIGH_BAND_MAX_SIZE]; | ||
107 | int high_band_values[MAX_CHANNELS][HIGH_BAND_MAX_SIZE]; | ||
108 | |||
109 | /* there are two possible tables for spectral coefficients */ | ||
110 | VLC coef_vlc[2]; | ||
111 | uint16_t *run_table[2]; | ||
112 | uint16_t *level_table[2]; | ||
113 | /* frame info */ | ||
114 | int frame_len; /* frame length in samples */ | ||
115 | int frame_len_bits; /* frame_len = 1 << frame_len_bits */ | ||
116 | |||
117 | /* block info */ | ||
118 | int reset_block_lengths; | ||
119 | int block_len_bits; /* log2 of current block length */ | ||
120 | int next_block_len_bits; /* log2 of next block length */ | ||
121 | int prev_block_len_bits; /* log2 of prev block length */ | ||
122 | int block_len; /* block length in samples */ | ||
123 | int block_num; /* block number in current frame */ | ||
124 | int block_pos; /* current position in frame */ | ||
125 | uint8_t ms_stereo; /* true if mid/side stereo mode */ | ||
126 | uint8_t channel_coded[MAX_CHANNELS]; /* true if channel is coded */ | ||
127 | fixed32 exponents[MAX_CHANNELS][BLOCK_MAX_SIZE]; | ||
128 | fixed32 max_exponent[MAX_CHANNELS]; | ||
129 | int16_t coefs1[MAX_CHANNELS][BLOCK_MAX_SIZE]; | ||
130 | fixed32 coefs[MAX_CHANNELS][BLOCK_MAX_SIZE]; | ||
131 | MDCTContext mdct_ctx[BLOCK_NB_SIZES]; | ||
132 | fixed32 *windows[BLOCK_NB_SIZES]; | ||
133 | FFTComplex mdct_tmp[BLOCK_MAX_SIZE]; /* temporary storage for imdct */ | ||
134 | /* output buffer for one frame and the last for IMDCT windowing */ | ||
135 | fixed32 frame_out[MAX_CHANNELS][BLOCK_MAX_SIZE * 2]; | ||
136 | /* last frame info */ | ||
137 | uint8_t last_superframe[MAX_CODED_SUPERFRAME_SIZE + 4]; /* padding added */ | ||
138 | int last_bitoffset; | ||
139 | int last_superframe_len; | ||
140 | fixed32 noise_table[NOISE_TAB_SIZE]; | ||
141 | int noise_index; | ||
142 | fixed32 noise_mult; /* XXX: suppress that and integrate it in the noise array */ | ||
143 | /* lsp_to_curve tables */ | ||
144 | fixed32 lsp_cos_table[BLOCK_MAX_SIZE]; | ||
145 | fixed64 lsp_pow_e_table[256]; | ||
146 | fixed64 lsp_pow_m_table1[(1 << LSP_POW_BITS)]; | ||
147 | fixed64 lsp_pow_m_table2[(1 << LSP_POW_BITS)]; | ||
148 | |||
149 | #ifdef TRACE | ||
150 | |||
151 | int frame_count; | ||
152 | #endif | ||
153 | } | ||
154 | WMADecodeContext; | ||
155 | |||
156 | int wma_decode_init(WMADecodeContext* s, asf_waveformatex_t *wfx); | ||
157 | int wma_decode_superframe(WMADecodeContext* s, | ||
158 | void *data, int *data_size, | ||
159 | uint8_t *buf, int buf_size); | ||
160 | int wma_decode_end(WMADecodeContext *s); | ||
161 | |||
162 | #endif | ||