7 /* These are the necessary scales for first-order HF responses to play over
8 * higher-order 2D (non-periphonic) decoders.
10 #define W_SCALE_2H0P 1.224744871f /* sqrt(1.5) */
11 #define XYZ_SCALE_2H0P 1.0f
12 #define W_SCALE_3H0P 1.414213562f /* sqrt(2) */
13 #define XYZ_SCALE_3H0P 1.082392196f
15 /* These are the necessary scales for first-order HF responses to play over
16 * higher-order 3D (periphonic) decoders.
18 #define W_SCALE_2H2P 1.341640787f /* sqrt(1.8) */
19 #define XYZ_SCALE_2H2P 1.0f
20 #define W_SCALE_3H3P 1.695486018f
21 #define XYZ_SCALE_3H3P 1.136697713f
24 /* NOTE: These are scale factors as applied to Ambisonics content. Decoder
25 * coefficients should be divided by these values to get proper N3D scalings.
27 const ALfloat N3D2N3DScale
[MAX_AMBI_COEFFS
];
28 const ALfloat SN3D2N3DScale
[MAX_AMBI_COEFFS
];
29 const ALfloat FuMa2N3DScale
[MAX_AMBI_COEFFS
];
37 struct BFormatDec
*bformatdec_alloc();
38 void bformatdec_free(struct BFormatDec
**dec
);
39 void bformatdec_reset(struct BFormatDec
*dec
, const struct AmbDecConf
*conf
, ALsizei chancount
, ALuint srate
, const ALsizei chanmap
[MAX_OUTPUT_CHANNELS
]);
41 /* Decodes the ambisonic input to the given output channels. */
42 void bformatdec_process(struct BFormatDec
*dec
, ALfloat (*restrict OutBuffer
)[BUFFERSIZE
], ALsizei OutChannels
, const ALfloat (*restrict InSamples
)[BUFFERSIZE
], ALsizei SamplesToDo
);
44 /* Up-samples a first-order input to the decoder's configuration. */
45 void bformatdec_upSample(struct BFormatDec
*dec
, ALfloat (*restrict OutBuffer
)[BUFFERSIZE
], const ALfloat (*restrict InSamples
)[BUFFERSIZE
], ALsizei InChannels
, ALsizei SamplesToDo
);
48 /* Stand-alone first-order upsampler. Kept here because it shares some stuff
49 * with bformatdec. Assumes a periphonic (4-channel) input mix!
51 struct AmbiUpsampler
*ambiup_alloc();
52 void ambiup_free(struct AmbiUpsampler
**ambiup
);
53 void ambiup_reset(struct AmbiUpsampler
*ambiup
, const ALCdevice
*device
, ALfloat w_scale
, ALfloat xyz_scale
);
55 void ambiup_process(struct AmbiUpsampler
*ambiup
, ALfloat (*restrict OutBuffer
)[BUFFERSIZE
], ALsizei OutChannels
, const ALfloat (*restrict InSamples
)[BUFFERSIZE
], ALsizei SamplesToDo
);
57 #endif /* BFORMATDEC_H */