1 files changed, 57 insertions, 0 deletions
diff --git a/Alc/bformatdec.h b/Alc/bformatdec.h
new file mode 100644
index 00000000..2d7d1d62
--- /dev/null
+++ b/Alc/bformatdec.h
@@ -0,0 +1,57 @@
+#ifndef BFORMATDEC_H
+#define BFORMATDEC_H
+
+#include "alMain.h"
+
+
+/* These are the necessary scales for first-order HF responses to play over
+ * higher-order 2D (non-periphonic) decoders.
+ */
+#define W_SCALE_2H0P   1.224744871f /* sqrt(1.5) */
+#define XYZ_SCALE_2H0P 1.0f
+#define W_SCALE_3H0P   1.414213562f /* sqrt(2) */
+#define XYZ_SCALE_3H0P 1.082392196f
+
+/* These are the necessary scales for first-order HF responses to play over
+ * higher-order 3D (periphonic) decoders.
+ */
+#define W_SCALE_2H2P   1.341640787f /* sqrt(1.8) */
+#define XYZ_SCALE_2H2P 1.0f
+#define W_SCALE_3H3P   1.695486018f
+#define XYZ_SCALE_3H3P 1.136697713f
+
+
+/* NOTE: These are scale factors as applied to Ambisonics content. Decoder
+ * coefficients should be divided by these values to get proper N3D scalings.
+ */
+const ALfloat N3D2N3DScale[MAX_AMBI_COEFFS];
+const ALfloat SN3D2N3DScale[MAX_AMBI_COEFFS];
+const ALfloat FuMa2N3DScale[MAX_AMBI_COEFFS];
+
+
+struct AmbDecConf;
+struct BFormatDec;
+struct AmbiUpsampler;
+
+
+struct BFormatDec *bformatdec_alloc();
+void bformatdec_free(struct BFormatDec **dec);
+void bformatdec_reset(struct BFormatDec *dec, const struct AmbDecConf *conf, ALsizei chancount, ALuint srate, const ALsizei chanmap[MAX_OUTPUT_CHANNELS]);
+
+/* Decodes the ambisonic input to the given output channels. */
+void bformatdec_process(struct BFormatDec *dec, ALfloat (*restrict OutBuffer)[BUFFERSIZE], ALsizei OutChannels, const ALfloat (*restrict InSamples)[BUFFERSIZE], ALsizei SamplesToDo);
+
+/* Up-samples a first-order input to the decoder's configuration. */
+void bformatdec_upSample(struct BFormatDec *dec, ALfloat (*restrict OutBuffer)[BUFFERSIZE], const ALfloat (*restrict InSamples)[BUFFERSIZE], ALsizei InChannels, ALsizei SamplesToDo);
+
+
+/* Stand-alone first-order upsampler. Kept here because it shares some stuff
+ * with bformatdec. Assumes a periphonic (4-channel) input mix!
+ */
+struct AmbiUpsampler *ambiup_alloc();
+void ambiup_free(struct AmbiUpsampler **ambiup);
+void ambiup_reset(struct AmbiUpsampler *ambiup, const ALCdevice *device, ALfloat w_scale, ALfloat xyz_scale);
+
+void ambiup_process(struct AmbiUpsampler *ambiup, ALfloat (*restrict OutBuffer)[BUFFERSIZE], ALsizei OutChannels, const ALfloat (*restrict InSamples)[BUFFERSIZE], ALsizei SamplesToDo);
+
+#endif /* BFORMATDEC_H */