pci/echoaudio/echoaudio_dsp.h

3    Copyright Echo Digital Audio Corporation (c) 1998 - 2004
21    Foundation, Inc., 59 Temple Place - Suite 330, Boston,
22    MA  02111-1307, USA.
26  Translation from C++ and adaptation for use in ALSA-Driver
41 /**** Echo24: Gina24, Layla24, Mona, Mia, Mia-midi ****/
70  *  Max inputs and outputs
74 #define DSP_MAXAUDIOINPUTS		16	/* Max audio input channels */
75 #define DSP_MAXAUDIOOUTPUTS		16	/* Max audio output channels */
76 #define DSP_MAXPIPES			32	/* Max total pipes (input + output) */
81  * These are the offsets for the memory-mapped DSP registers; the DSP base
133 #define MIDI_IN_SKIP_DATA	(-1)
136 /*----------------------------------------------------------------------------
138 Setting the sample rates on Layla24 is somewhat schizophrenic.
145 the future), Layla24 also has "continuous sample rate mode".  In this mode,
146 Layla24 can generate any sample rate between 25 and 50 kHz inclusive, or
151 -Set the clock select bits in the control register to 0xe (see the #define
154 -Set double-speed mode if you want to use sample rates above 50 kHz
156 -Write the control register as you would normally
158 -Now, you need to set the frequency register. First, you need to determine the
161 frequency_reg = (LAYLA24_MAGIC_NUMBER / sample_rate) - 2
165 -Wait for the DSP handshake
166 -Write the frequency_reg value to the .SampleRate field of the comm page
167 -Send the vector command SET_LAYLA24_FREQUENCY_REG (see vmonkey.h)
170 write the frequency register to change the sample rate.  This could be
175 -----------------------------------------------------------------------------*/
252 #define DSP_FLAG_SPDIF_NONAUDIO		0x0002	/* Sets the "non-audio" bit
369  * via input and output pipes.  LE means little-endian,
370  * BE means big-endian.
374  *    8-bit mono unsigned samples.  For playback,
377  *    means mono->stereo.
381  *    16-bit signed little-endian mono samples.  Playback works
386  *    24-bit signed little-endian mono samples.  Data is packed
387  *    three bytes per sample; if you had two samples 0x112233 and 0x445566
392  *    24-bit signed little-endian mono samples in a 32-bit
393  *    container.  In other words, each sample is a 32-bit signed
394  *    integer, where the actual audio data is left-justified
403  *    data.  "SS" means stereo->stereo.
410  *    mono->mono.
415  *    in big-endian format.
427 #define DSP_AUDIOFORM_MM_32LE	8	/* 32 bit mono->mono little-endian */
428 #define DSP_AUDIOFORM_MM_32BE	9	/* 32 bit mono->mono big-endian */
435  * Super-interleave is defined as interleaving by 4 or more.  Darla20 and Gina20
439  * interleave.  The interleave factor must be even.  16 - way interleave is the
442  * The actual format code is derived by taking the define below and or-ing with
501  * Mia sample rate and clock setting constants
570 #define E3G_FREQ_REG_DEFAULT		(E3G_MAGIC_NUMBER / 48000 - 2)
591  * this is the magic number for the hardware that gives you 0 dB at -10.
624 /* sg_entry is a single entry for the scatter-gather list.  The array of struct
625 sg_entry struct is read by the DSP, so all values must be little-endian. */
641   Any reads from or writes to this structure should be in little-endian format.
649 	__le32 sample_rate;	/* Card sample rate in Hz	0x00c	4 */
670 			/* Gina/Darla play filters - obsolete	0x3c0	168*4 */
672 			/* Gina/Darla record filters - obsolete	0x660	192*4 */
679 	__le32 nominal_level_mask;	/* -10 level enable mask	0xb64	4 */