mirror of https://github.com/PCSX2/pcsx2.git
112 lines
3.1 KiB
C
112 lines
3.1 KiB
C
//GiGaHeRz's SPU2 Driver
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//Copyright (c) 2003-2008, David Quintana <gigaherz@gmail.com>
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//
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//This library is free software; you can redistribute it and/or
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//modify it under the terms of the GNU Lesser General Public
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//License as published by the Free Software Foundation; either
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//version 2.1 of the License, or (at your option) any later version.
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//
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//This library is distributed in the hope that it will be useful,
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//but WITHOUT ANY WARRANTY; without even the implied warranty of
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//MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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//Lesser General Public License for more details.
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//
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//You should have received a copy of the GNU Lesser General Public
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//License along with this library; if not, write to the Free Software
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//Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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//
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#pragma once
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#ifndef u32
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typedef unsigned int u32;
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#endif
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/*
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Preamble cell-order cell-order
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(last cell "0") (last cell "1")
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----------------------------------------------
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"B" 11101000 00010111
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"M" 11100010 00011101
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"W" 11100100 00011011
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Only the lower 4 bits are used.
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Preamble B: Marks a word containing data for channel A (left)
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at the start of the data-block.
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Preamble M: Marks a word with data for channel A that isn't
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at the start of the data-block.
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Preamble W: Marks a word containing data for channel B.
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(right, for stereo). When using more than 2
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channels, this could also be any other channel
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(except for A).
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bits meaning
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----------------------------------------------------------
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0-3 Preamble (see above; special structure)
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4-7 Auxillary-audio-databits
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8-27 Sample
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(A 24-bit sample can be used (using bits 4-27).
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A CD-player uses only 16 bits, so only bits
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13 (LSB) to 27 (MSB) are used. Bits 4-12 are
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set to 0).
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28 Validity
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(When this bit is set, the sample should not
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be used by the receiver. A CD-player uses
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the 'error-flag' to set this bit).
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29 Subcode-data
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30 Channel-status-information
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31 Parity (bit 0-3 are not included)
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*/
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typedef struct _subframe
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{
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u32 preamble:4;
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u32 aux_data:4;
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u32 snd_data:20;
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u32 validity:1;
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u32 subcode:1;
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u32 chstatus:1;
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u32 parity:1;
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} subframe;
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/*
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bit meaning
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-------------------------------------------------------------
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0-3 controlbits:
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bit 0: 0 (is set to 1 during 4 channel transmission)
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bit 1: 0=Digital audio, 1=Non-audio (reserved to be 0 on old S/PDIF specs)
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bit 2: copy-protection. Copying is allowed when this bit is set.
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bit 3: is set when pre-emphasis is used.
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4-7 0 (reserved)
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9-15 catagory-code:
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0 = common 2-channel format
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1 = 2-channel CD-format
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(set by a CD-player when a subcode is transmitted)
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2 = 2-channel PCM-encoder-decoder format
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others are not used
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19-191 0 (reserved)
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*/
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typedef struct _chstatus
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{
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u8 ctrlbits:4;
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u8 reservd1:4;
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u8 category;
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u8 reservd2[22];
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} chstatus:
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