65 lines
2.3 KiB
C
65 lines
2.3 KiB
C
#ifndef BFORMATDEC_H
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#define BFORMATDEC_H
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#include "alMain.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* These are the necessary scales for first-order HF responses to play over
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* higher-order 2D (non-periphonic) decoders.
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*/
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#define W_SCALE_2H0P 1.224744871f /* sqrt(1.5) */
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#define XYZ_SCALE_2H0P 1.0f
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#define W_SCALE_3H0P 1.414213562f /* sqrt(2) */
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#define XYZ_SCALE_3H0P 1.082392196f
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/* These are the necessary scales for first-order HF responses to play over
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* higher-order 3D (periphonic) decoders.
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*/
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#define W_SCALE_2H2P 1.341640787f /* sqrt(1.8) */
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#define XYZ_SCALE_2H2P 1.0f
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#define W_SCALE_3H3P 1.695486018f
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#define XYZ_SCALE_3H3P 1.136697713f
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/* NOTE: These are scale factors as applied to Ambisonics content. Decoder
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* coefficients should be divided by these values to get proper N3D scalings.
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*/
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extern const ALfloat N3D2N3DScale[MAX_AMBI_COEFFS];
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extern const ALfloat SN3D2N3DScale[MAX_AMBI_COEFFS];
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extern const ALfloat FuMa2N3DScale[MAX_AMBI_COEFFS];
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struct AmbDecConf;
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struct BFormatDec;
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struct AmbiUpsampler;
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struct BFormatDec *bformatdec_alloc();
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void bformatdec_free(struct BFormatDec **dec);
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void bformatdec_reset(struct BFormatDec *dec, const struct AmbDecConf *conf, ALsizei chancount, ALuint srate, const ALsizei chanmap[MAX_OUTPUT_CHANNELS]);
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/* Decodes the ambisonic input to the given output channels. */
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void bformatdec_process(struct BFormatDec *dec, ALfloat (*RESTRICT OutBuffer)[BUFFERSIZE], ALsizei OutChannels, const ALfloat (*RESTRICT InSamples)[BUFFERSIZE], ALsizei SamplesToDo);
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/* Up-samples a first-order input to the decoder's configuration. */
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void bformatdec_upSample(struct BFormatDec *dec, ALfloat (*RESTRICT OutBuffer)[BUFFERSIZE], const ALfloat (*RESTRICT InSamples)[BUFFERSIZE], ALsizei InChannels, ALsizei SamplesToDo);
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/* Stand-alone first-order upsampler. Kept here because it shares some stuff
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* with bformatdec. Assumes a periphonic (4-channel) input mix!
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*/
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struct AmbiUpsampler *ambiup_alloc();
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void ambiup_free(struct AmbiUpsampler **ambiup);
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void ambiup_reset(struct AmbiUpsampler *ambiup, const ALCdevice *device, ALfloat w_scale, ALfloat xyz_scale);
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void ambiup_process(struct AmbiUpsampler *ambiup, ALfloat (*RESTRICT OutBuffer)[BUFFERSIZE], ALsizei OutChannels, const ALfloat (*RESTRICT InSamples)[BUFFERSIZE], ALsizei SamplesToDo);
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#ifdef __cplusplus
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} // extern "C"
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#endif
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#endif /* BFORMATDEC_H */
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