30 #define EAC3_MAX_CHANNELS 16
31 #define AC3_MAX_CHANNELS 7
34 #define AC3_MAX_COEFS 256
35 #define AC3_BLOCK_SIZE 256
36 #define AC3_MAX_BLOCKS 6
37 #define AC3_FRAME_SIZE (AC3_MAX_BLOCKS * 256)
38 #define AC3_WINDOW_SIZE (AC3_BLOCK_SIZE * 2)
39 #define AC3_CRITICAL_BANDS 50
40 #define AC3_MAX_CPL_BANDS 18
62 #define FIXR(a) ((int)((a) * 0 + 0.5))
63 #define FIXR12(a) ((int)((a) * 4096 + 0.5))
64 #define FIXR15(a) ((int)((a) * 32768 + 0.5))
65 #define ROUND15(x) ((x) + 16384) >> 15
67 #define AC3_RENAME(x) x ## _fixed
68 #define AC3_NORM(norm) (1<<24)/(norm)
69 #define AC3_MUL(a,b) ((((int64_t) (a)) * (b))>>12)
70 #define AC3_RANGE(x) ((x)|(((x)&128)<<1))
71 #define AC3_HEAVY_RANGE(x) ((x)<<1)
72 #define AC3_DYNAMIC_RANGE(x) (x)
73 #define AC3_SPX_BLEND(x) (x)
74 #define AC3_DYNAMIC_RANGE1 0
82 #define FIXR(x) ((float)(x))
83 #define FIXR12(x) ((float)(x))
84 #define FIXR15(x) ((float)(x))
85 #define ROUND15(x) (x)
87 #define AC3_RENAME(x) x
88 #define AC3_NORM(norm) (1.0f/(norm))
89 #define AC3_MUL(a,b) ((a) * (b))
90 #define AC3_RANGE(x) (dynamic_range_tab[(x)])
91 #define AC3_HEAVY_RANGE(x) (ff_ac3_heavy_dynamic_range_tab[(x)])
92 #define AC3_DYNAMIC_RANGE(x) (powf(x, s->drc_scale))
93 #define AC3_SPX_BLEND(x) (x)* (1.0f/32)
94 #define AC3_DYNAMIC_RANGE1 1.0f
102 #define AC3_LEVEL(x) ROUND15((x) * FIXR15(M_SQRT1_2))
105 #define LEVEL_PLUS_3DB M_SQRT2
106 #define LEVEL_PLUS_1POINT5DB 1.1892071150027209
107 #define LEVEL_MINUS_1POINT5DB 0.8408964152537145
108 #define LEVEL_MINUS_3DB M_SQRT1_2
109 #define LEVEL_MINUS_4POINT5DB 0.5946035575013605
110 #define LEVEL_MINUS_6DB 0.5000000000000000
111 #define LEVEL_MINUS_9DB 0.3535533905932738
112 #define LEVEL_ZERO 0.0000000000000000
113 #define LEVEL_ONE 1.0000000000000000
259 int start,
int end,
int fast_gain,
int is_lfe,
260 int dba_mode,
int dba_nsegs,
uint8_t *dba_offsets,
int ff_ac3_bit_alloc_calc_mask(AC3BitAllocParameters *s, int16_t *band_psd, int start, int end, int fast_gain, int is_lfe, int dba_mode, int dba_nsegs, uint8_t *dba_offsets, uint8_t *dba_lengths, uint8_t *dba_values, int16_t *mask)
Calculate the masking curve.
AC3DolbyHeadphoneMode
Dolby Headphone mode.
@ AC3_DHEADPHONMOD_RESERVED
@ AC3_DHEADPHONMOD_NOTINDICATED
AC3DolbySurroundEXMode
Dolby Surround EX mode.
@ AC3_DSUREXMOD_NOTINDICATED
void ff_ac3_common_init(void)
AC3ChannelMode
Channel mode (audio coding mode)
void ff_ac3_bit_alloc_calc_psd(int8_t *exp, int start, int end, int16_t *psd, int16_t *band_psd)
Calculate the log power-spectral density of the input signal.
@ EAC3_FRAME_TYPE_DEPENDENT
@ EAC3_FRAME_TYPE_INDEPENDENT
@ EAC3_FRAME_TYPE_RESERVED
@ EAC3_FRAME_TYPE_AC3_CONVERT
AC3DeltaStrategy
Delta bit allocation strategy.
AC3PreferredStereoDownmixMode
Preferred Stereo Downmix mode.
@ AC3_DMIXMOD_NOTINDICATED
AC3DolbySurroundMode
Dolby Surround mode.
@ AC3_DSURMOD_NOTINDICATED
Libavcodec external API header.
static const uint16_t mask[17]