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Sweden-Number/dlls/msg711.acm/msg711.c

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/*
* G711 handling (includes A-Law & MU-Law)
*
* Copyright (C) 2002 Eric Pouech
*
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <assert.h>
#include <stdarg.h>
#include <string.h>
#include "windef.h"
#include "winbase.h"
#include "wingdi.h"
#include "winuser.h"
#include "winnls.h"
#include "mmsystem.h"
#include "mmreg.h"
#include "msacm.h"
#include "msacmdrv.h"
#include "wine/debug.h"
WINE_DEFAULT_DEBUG_CHANNEL(g711);
/***********************************************************************
* G711_drvOpen
*/
static LRESULT G711_drvOpen(LPCSTR str)
{
return 1;
}
/***********************************************************************
* G711_drvClose
*/
static LRESULT G711_drvClose(DWORD_PTR dwDevID)
{
return 1;
}
typedef struct tagAcmG711Data
{
void (*convert)(PACMDRVSTREAMINSTANCE adsi,
const unsigned char*, LPDWORD, unsigned char*, LPDWORD);
} AcmG711Data;
/* table to list all supported formats... those are the basic ones. this
* also helps given a unique index to each of the supported formats
*/
typedef struct
{
int nChannels;
int nBits;
int rate;
} Format;
static const Format PCM_Formats[] =
{
/*{1, 8, 8000}, {2, 8, 8000}, */{1, 16, 8000}, {2, 16, 8000},
/*{1, 8, 11025}, {2, 8, 11025}, */{1, 16, 11025}, {2, 16, 11025},
/*{1, 8, 22050}, {2, 8, 22050}, */{1, 16, 22050}, {2, 16, 22050},
/*{1, 8, 44100}, {2, 8, 44100}, */{1, 16, 44100}, {2, 16, 44100},
};
static const Format ALaw_Formats[] =
{
{1, 8, 8000}, {2, 8, 8000}, {1, 8, 11025}, {2, 8, 11025},
{1, 8, 22050}, {2, 8, 22050}, {1, 8, 44100}, {2, 8, 44100},
};
static const Format ULaw_Formats[] =
{
{1, 8, 8000}, {2, 8, 8000}, {1, 8, 11025}, {2, 8, 11025},
{1, 8, 22050}, {2, 8, 22050}, {1, 8, 44100}, {2, 8, 44100},
};
#define NUM_PCM_FORMATS (sizeof(PCM_Formats) / sizeof(PCM_Formats[0]))
#define NUM_ALAW_FORMATS (sizeof(ALaw_Formats) / sizeof(ALaw_Formats[0]))
#define NUM_ULAW_FORMATS (sizeof(ULaw_Formats) / sizeof(ULaw_Formats[0]))
/***********************************************************************
* G711_GetFormatIndex
*/
static DWORD G711_GetFormatIndex(LPWAVEFORMATEX wfx)
{
int i, hi;
const Format* fmts;
switch (wfx->wFormatTag)
{
case WAVE_FORMAT_PCM:
hi = NUM_PCM_FORMATS;
fmts = PCM_Formats;
break;
case WAVE_FORMAT_ALAW:
hi = NUM_ALAW_FORMATS;
fmts = ALaw_Formats;
break;
case WAVE_FORMAT_MULAW:
hi = NUM_ULAW_FORMATS;
fmts = ULaw_Formats;
break;
default:
return 0xFFFFFFFF;
}
for (i = 0; i < hi; i++)
{
if (wfx->nChannels == fmts[i].nChannels &&
wfx->nSamplesPerSec == fmts[i].rate &&
wfx->wBitsPerSample == fmts[i].nBits)
return i;
}
return 0xFFFFFFFF;
}
/***********************************************************************
* R16
*
* Read a 16 bit sample (correctly handles endianess)
*/
static inline short R16(const unsigned char* src)
{
return (short)((unsigned short)src[0] | ((unsigned short)src[1] << 8));
}
/***********************************************************************
* W16
*
* Write a 16 bit sample (correctly handles endianess)
*/
static inline void W16(unsigned char* dst, short s)
{
dst[0] = LOBYTE(s);
dst[1] = HIBYTE(s);
}
/* You can uncomment this if you don't want the statically generated conversion
* table, but rather recompute the Xlaw => PCM conversion for each sample
#define NO_FASTDECODE
* Since the conversion tables are rather small (2k), I don't think it's really
* interesting not to use them, but keeping the actual conversion code around
* is helpful to regenerate the tables when needed.
*/
/* -------------------------------------------------------------------------------*/
/*
* This source code is a product of Sun Microsystems, Inc. and is provided
* for unrestricted use. Users may copy or modify this source code without
* charge.
*
* SUN SOURCE CODE IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING
* THE WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
* PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
*
* Sun source code is provided with no support and without any obligation on
* the part of Sun Microsystems, Inc. to assist in its use, correction,
* modification or enhancement.
*
* SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
* INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY THIS SOFTWARE
* OR ANY PART THEREOF.
*
* In no event will Sun Microsystems, Inc. be liable for any lost revenue
* or profits or other special, indirect and consequential damages, even if
* Sun has been advised of the possibility of such damages.
*
* Sun Microsystems, Inc.
* 2550 Garcia Avenue
* Mountain View, California 94043
*/
/*
* g711.c
*
* u-law, A-law and linear PCM conversions.
*/
/*
* December 30, 1994:
* Functions linear2alaw, linear2ulaw have been updated to correctly
* convert unquantized 16 bit values.
* Tables for direct u- to A-law and A- to u-law conversions have been
* corrected.
* Borge Lindberg, Center for PersonKommunikation, Aalborg University.
* bli@cpk.auc.dk
*
*/
#define SIGN_BIT (0x80) /* Sign bit for an A-law byte. */
#define QUANT_MASK (0xf) /* Quantization field mask. */
#define NSEGS (8) /* Number of A-law segments. */
#define SEG_SHIFT (4) /* Left shift for segment number. */
#define SEG_MASK (0x70) /* Segment field mask. */
static const short seg_aend[8] = {0x1F, 0x3F, 0x7F, 0x0FF, 0x1FF, 0x3FF, 0x7FF, 0x0FFF};
static const short seg_uend[8] = {0x3F, 0x7F, 0xFF, 0x1FF, 0x3FF, 0x7FF, 0xFFF, 0x1FFF};
/* copy from CCITT G.711 specifications */
static const unsigned char _u2a[128] = { /* u- to A-law conversions */
1, 1, 2, 2, 3, 3, 4, 4,
5, 5, 6, 6, 7, 7, 8, 8,
9, 10, 11, 12, 13, 14, 15, 16,
17, 18, 19, 20, 21, 22, 23, 24,
25, 27, 29, 31, 33, 34, 35, 36,
37, 38, 39, 40, 41, 42, 43, 44,
46, 48, 49, 50, 51, 52, 53, 54,
55, 56, 57, 58, 59, 60, 61, 62,
64, 65, 66, 67, 68, 69, 70, 71,
72, 73, 74, 75, 76, 77, 78, 79,
/* corrected:
81, 82, 83, 84, 85, 86, 87, 88,
should be: */
80, 82, 83, 84, 85, 86, 87, 88,
89, 90, 91, 92, 93, 94, 95, 96,
97, 98, 99, 100, 101, 102, 103, 104,
105, 106, 107, 108, 109, 110, 111, 112,
113, 114, 115, 116, 117, 118, 119, 120,
121, 122, 123, 124, 125, 126, 127, 128};
static const unsigned char _a2u[128] = { /* A- to u-law conversions */
1, 3, 5, 7, 9, 11, 13, 15,
16, 17, 18, 19, 20, 21, 22, 23,
24, 25, 26, 27, 28, 29, 30, 31,
32, 32, 33, 33, 34, 34, 35, 35,
36, 37, 38, 39, 40, 41, 42, 43,
44, 45, 46, 47, 48, 48, 49, 49,
50, 51, 52, 53, 54, 55, 56, 57,
58, 59, 60, 61, 62, 63, 64, 64,
65, 66, 67, 68, 69, 70, 71, 72,
/* corrected:
73, 74, 75, 76, 77, 78, 79, 79,
should be: */
73, 74, 75, 76, 77, 78, 79, 80,
80, 81, 82, 83, 84, 85, 86, 87,
88, 89, 90, 91, 92, 93, 94, 95,
96, 97, 98, 99, 100, 101, 102, 103,
104, 105, 106, 107, 108, 109, 110, 111,
112, 113, 114, 115, 116, 117, 118, 119,
120, 121, 122, 123, 124, 125, 126, 127};
static short
search(
int val, /* changed from "short" *drago* */
const short *table,
int size) /* changed from "short" *drago* */
{
int i; /* changed from "short" *drago* */
for (i = 0; i < size; i++) {
if (val <= *table++)
return (i);
}
return (size);
}
/*
* linear2alaw() - Convert a 16-bit linear PCM value to 8-bit A-law
*
* linear2alaw() accepts an 16-bit integer and encodes it as A-law data.
*
* Linear Input Code Compressed Code
* ------------------------ ---------------
* 0000000wxyza 000wxyz
* 0000001wxyza 001wxyz
* 000001wxyzab 010wxyz
* 00001wxyzabc 011wxyz
* 0001wxyzabcd 100wxyz
* 001wxyzabcde 101wxyz
* 01wxyzabcdef 110wxyz
* 1wxyzabcdefg 111wxyz
*
* For further information see John C. Bellamy's Digital Telephony, 1982,
* John Wiley & Sons, pps 98-111 and 472-476.
*/
static inline unsigned char
linear2alaw(int pcm_val) /* 2's complement (16-bit range) */
/* changed from "short" *drago* */
{
int mask; /* changed from "short" *drago* */
int seg; /* changed from "short" *drago* */
unsigned char aval;
pcm_val = pcm_val >> 3;
if (pcm_val >= 0) {
mask = 0xD5; /* sign (7th) bit = 1 */
} else {
mask = 0x55; /* sign bit = 0 */
pcm_val = -pcm_val - 1;
}
/* Convert the scaled magnitude to segment number. */
seg = search(pcm_val, seg_aend, 8);
/* Combine the sign, segment, and quantization bits. */
if (seg >= 8) /* out of range, return maximum value. */
return (unsigned char) (0x7F ^ mask);
else {
aval = (unsigned char) seg << SEG_SHIFT;
if (seg < 2)
aval |= (pcm_val >> 1) & QUANT_MASK;
else
aval |= (pcm_val >> seg) & QUANT_MASK;
return (aval ^ mask);
}
}
#ifdef NO_FASTDECODE
/*
* alaw2linear() - Convert an A-law value to 16-bit linear PCM
*
*/
static inline int
alaw2linear(unsigned char a_val)
{
int t; /* changed from "short" *drago* */
int seg; /* changed from "short" *drago* */
a_val ^= 0x55;
t = (a_val & QUANT_MASK) << 4;
seg = ((unsigned)a_val & SEG_MASK) >> SEG_SHIFT;
switch (seg) {
case 0:
t += 8;
break;
case 1:
t += 0x108;
break;
default:
t += 0x108;
t <<= seg - 1;
}
return ((a_val & SIGN_BIT) ? t : -t);
}
#else
/* EPP (for Wine):
* this array has been statically generated from the above routine
*/
static const unsigned short _a2l[] = {
0xEA80, 0xEB80, 0xE880, 0xE980, 0xEE80, 0xEF80, 0xEC80, 0xED80,
0xE280, 0xE380, 0xE080, 0xE180, 0xE680, 0xE780, 0xE480, 0xE580,
0xF540, 0xF5C0, 0xF440, 0xF4C0, 0xF740, 0xF7C0, 0xF640, 0xF6C0,
0xF140, 0xF1C0, 0xF040, 0xF0C0, 0xF340, 0xF3C0, 0xF240, 0xF2C0,
0xAA00, 0xAE00, 0xA200, 0xA600, 0xBA00, 0xBE00, 0xB200, 0xB600,
0x8A00, 0x8E00, 0x8200, 0x8600, 0x9A00, 0x9E00, 0x9200, 0x9600,
0xD500, 0xD700, 0xD100, 0xD300, 0xDD00, 0xDF00, 0xD900, 0xDB00,
0xC500, 0xC700, 0xC100, 0xC300, 0xCD00, 0xCF00, 0xC900, 0xCB00,
0xFEA8, 0xFEB8, 0xFE88, 0xFE98, 0xFEE8, 0xFEF8, 0xFEC8, 0xFED8,
0xFE28, 0xFE38, 0xFE08, 0xFE18, 0xFE68, 0xFE78, 0xFE48, 0xFE58,
0xFFA8, 0xFFB8, 0xFF88, 0xFF98, 0xFFE8, 0xFFF8, 0xFFC8, 0xFFD8,
0xFF28, 0xFF38, 0xFF08, 0xFF18, 0xFF68, 0xFF78, 0xFF48, 0xFF58,
0xFAA0, 0xFAE0, 0xFA20, 0xFA60, 0xFBA0, 0xFBE0, 0xFB20, 0xFB60,
0xF8A0, 0xF8E0, 0xF820, 0xF860, 0xF9A0, 0xF9E0, 0xF920, 0xF960,
0xFD50, 0xFD70, 0xFD10, 0xFD30, 0xFDD0, 0xFDF0, 0xFD90, 0xFDB0,
0xFC50, 0xFC70, 0xFC10, 0xFC30, 0xFCD0, 0xFCF0, 0xFC90, 0xFCB0,
0x1580, 0x1480, 0x1780, 0x1680, 0x1180, 0x1080, 0x1380, 0x1280,
0x1D80, 0x1C80, 0x1F80, 0x1E80, 0x1980, 0x1880, 0x1B80, 0x1A80,
0x0AC0, 0x0A40, 0x0BC0, 0x0B40, 0x08C0, 0x0840, 0x09C0, 0x0940,
0x0EC0, 0x0E40, 0x0FC0, 0x0F40, 0x0CC0, 0x0C40, 0x0DC0, 0x0D40,
0x5600, 0x5200, 0x5E00, 0x5A00, 0x4600, 0x4200, 0x4E00, 0x4A00,
0x7600, 0x7200, 0x7E00, 0x7A00, 0x6600, 0x6200, 0x6E00, 0x6A00,
0x2B00, 0x2900, 0x2F00, 0x2D00, 0x2300, 0x2100, 0x2700, 0x2500,
0x3B00, 0x3900, 0x3F00, 0x3D00, 0x3300, 0x3100, 0x3700, 0x3500,
0x0158, 0x0148, 0x0178, 0x0168, 0x0118, 0x0108, 0x0138, 0x0128,
0x01D8, 0x01C8, 0x01F8, 0x01E8, 0x0198, 0x0188, 0x01B8, 0x01A8,
0x0058, 0x0048, 0x0078, 0x0068, 0x0018, 0x0008, 0x0038, 0x0028,
0x00D8, 0x00C8, 0x00F8, 0x00E8, 0x0098, 0x0088, 0x00B8, 0x00A8,
0x0560, 0x0520, 0x05E0, 0x05A0, 0x0460, 0x0420, 0x04E0, 0x04A0,
0x0760, 0x0720, 0x07E0, 0x07A0, 0x0660, 0x0620, 0x06E0, 0x06A0,
0x02B0, 0x0290, 0x02F0, 0x02D0, 0x0230, 0x0210, 0x0270, 0x0250,
0x03B0, 0x0390, 0x03F0, 0x03D0, 0x0330, 0x0310, 0x0370, 0x0350,
};
static inline int
alaw2linear(unsigned char a_val)
{
return (short)_a2l[a_val];
}
#endif
#define BIAS (0x84) /* Bias for linear code. */
#define CLIP 8159
/*
* linear2ulaw() - Convert a linear PCM value to u-law
*
* In order to simplify the encoding process, the original linear magnitude
* is biased by adding 33 which shifts the encoding range from (0 - 8158) to
* (33 - 8191). The result can be seen in the following encoding table:
*
* Biased Linear Input Code Compressed Code
* ------------------------ ---------------
* 00000001wxyza 000wxyz
* 0000001wxyzab 001wxyz
* 000001wxyzabc 010wxyz
* 00001wxyzabcd 011wxyz
* 0001wxyzabcde 100wxyz
* 001wxyzabcdef 101wxyz
* 01wxyzabcdefg 110wxyz
* 1wxyzabcdefgh 111wxyz
*
* Each biased linear code has a leading 1 which identifies the segment
* number. The value of the segment number is equal to 7 minus the number
* of leading 0's. The quantization interval is directly available as the
* four bits wxyz. * The trailing bits (a - h) are ignored.
*
* Ordinarily the complement of the resulting code word is used for
* transmission, and so the code word is complemented before it is returned.
*
* For further information see John C. Bellamy's Digital Telephony, 1982,
* John Wiley & Sons, pps 98-111 and 472-476.
*/
static inline unsigned char
linear2ulaw(short pcm_val) /* 2's complement (16-bit range) */
{
short mask;
short seg;
unsigned char uval;
/* Get the sign and the magnitude of the value. */
pcm_val = pcm_val >> 2;
if (pcm_val < 0) {
pcm_val = -pcm_val;
mask = 0x7F;
} else {
mask = 0xFF;
}
if ( pcm_val > CLIP ) pcm_val = CLIP; /* clip the magnitude */
pcm_val += (BIAS >> 2);
/* Convert the scaled magnitude to segment number. */
seg = search(pcm_val, seg_uend, 8);
/*
* Combine the sign, segment, quantization bits;
* and complement the code word.
*/
if (seg >= 8) /* out of range, return maximum value. */
return (unsigned char) (0x7F ^ mask);
else {
uval = (unsigned char) (seg << 4) | ((pcm_val >> (seg + 1)) & 0xF);
return (uval ^ mask);
}
}
#ifdef NO_FASTDECODE
/*
* ulaw2linear() - Convert a u-law value to 16-bit linear PCM
*
* First, a biased linear code is derived from the code word. An unbiased
* output can then be obtained by subtracting 33 from the biased code.
*
* Note that this function expects to be passed the complement of the
* original code word. This is in keeping with ISDN conventions.
*/
static inline short
ulaw2linear(unsigned char u_val)
{
short t;
/* Complement to obtain normal u-law value. */
u_val = ~u_val;
/*
* Extract and bias the quantization bits. Then
* shift up by the segment number and subtract out the bias.
*/
t = ((u_val & QUANT_MASK) << 3) + BIAS;
t <<= ((unsigned)u_val & SEG_MASK) >> SEG_SHIFT;
return ((u_val & SIGN_BIT) ? (BIAS - t) : (t - BIAS));
}
#else
/* EPP (for Wine):
* this array has been statically generated from the above routine
*/
static const unsigned short _u2l[] = {
0x8284, 0x8684, 0x8A84, 0x8E84, 0x9284, 0x9684, 0x9A84, 0x9E84,
0xA284, 0xA684, 0xAA84, 0xAE84, 0xB284, 0xB684, 0xBA84, 0xBE84,
0xC184, 0xC384, 0xC584, 0xC784, 0xC984, 0xCB84, 0xCD84, 0xCF84,
0xD184, 0xD384, 0xD584, 0xD784, 0xD984, 0xDB84, 0xDD84, 0xDF84,
0xE104, 0xE204, 0xE304, 0xE404, 0xE504, 0xE604, 0xE704, 0xE804,
0xE904, 0xEA04, 0xEB04, 0xEC04, 0xED04, 0xEE04, 0xEF04, 0xF004,
0xF0C4, 0xF144, 0xF1C4, 0xF244, 0xF2C4, 0xF344, 0xF3C4, 0xF444,
0xF4C4, 0xF544, 0xF5C4, 0xF644, 0xF6C4, 0xF744, 0xF7C4, 0xF844,
0xF8A4, 0xF8E4, 0xF924, 0xF964, 0xF9A4, 0xF9E4, 0xFA24, 0xFA64,
0xFAA4, 0xFAE4, 0xFB24, 0xFB64, 0xFBA4, 0xFBE4, 0xFC24, 0xFC64,
0xFC94, 0xFCB4, 0xFCD4, 0xFCF4, 0xFD14, 0xFD34, 0xFD54, 0xFD74,
0xFD94, 0xFDB4, 0xFDD4, 0xFDF4, 0xFE14, 0xFE34, 0xFE54, 0xFE74,
0xFE8C, 0xFE9C, 0xFEAC, 0xFEBC, 0xFECC, 0xFEDC, 0xFEEC, 0xFEFC,
0xFF0C, 0xFF1C, 0xFF2C, 0xFF3C, 0xFF4C, 0xFF5C, 0xFF6C, 0xFF7C,
0xFF88, 0xFF90, 0xFF98, 0xFFA0, 0xFFA8, 0xFFB0, 0xFFB8, 0xFFC0,
0xFFC8, 0xFFD0, 0xFFD8, 0xFFE0, 0xFFE8, 0xFFF0, 0xFFF8, 0x0000,
0x7D7C, 0x797C, 0x757C, 0x717C, 0x6D7C, 0x697C, 0x657C, 0x617C,
0x5D7C, 0x597C, 0x557C, 0x517C, 0x4D7C, 0x497C, 0x457C, 0x417C,
0x3E7C, 0x3C7C, 0x3A7C, 0x387C, 0x367C, 0x347C, 0x327C, 0x307C,
0x2E7C, 0x2C7C, 0x2A7C, 0x287C, 0x267C, 0x247C, 0x227C, 0x207C,
0x1EFC, 0x1DFC, 0x1CFC, 0x1BFC, 0x1AFC, 0x19FC, 0x18FC, 0x17FC,
0x16FC, 0x15FC, 0x14FC, 0x13FC, 0x12FC, 0x11FC, 0x10FC, 0x0FFC,
0x0F3C, 0x0EBC, 0x0E3C, 0x0DBC, 0x0D3C, 0x0CBC, 0x0C3C, 0x0BBC,
0x0B3C, 0x0ABC, 0x0A3C, 0x09BC, 0x093C, 0x08BC, 0x083C, 0x07BC,
0x075C, 0x071C, 0x06DC, 0x069C, 0x065C, 0x061C, 0x05DC, 0x059C,
0x055C, 0x051C, 0x04DC, 0x049C, 0x045C, 0x041C, 0x03DC, 0x039C,
0x036C, 0x034C, 0x032C, 0x030C, 0x02EC, 0x02CC, 0x02AC, 0x028C,
0x026C, 0x024C, 0x022C, 0x020C, 0x01EC, 0x01CC, 0x01AC, 0x018C,
0x0174, 0x0164, 0x0154, 0x0144, 0x0134, 0x0124, 0x0114, 0x0104,
0x00F4, 0x00E4, 0x00D4, 0x00C4, 0x00B4, 0x00A4, 0x0094, 0x0084,
0x0078, 0x0070, 0x0068, 0x0060, 0x0058, 0x0050, 0x0048, 0x0040,
0x0038, 0x0030, 0x0028, 0x0020, 0x0018, 0x0010, 0x0008, 0x0000,
};
static inline short ulaw2linear(unsigned char u_val)
{
return (short)_u2l[u_val];
}
#endif
/* A-law to u-law conversion */
static inline unsigned char
alaw2ulaw(unsigned char aval)
{
aval &= 0xff;
return (unsigned char) ((aval & 0x80) ? (0xFF ^ _a2u[aval ^ 0xD5]) :
(0x7F ^ _a2u[aval ^ 0x55]));
}
/* u-law to A-law conversion */
static inline unsigned char
ulaw2alaw(unsigned char uval)
{
uval &= 0xff;
return (unsigned char) ((uval & 0x80) ? (0xD5 ^ (_u2a[0xFF ^ uval] - 1)) :
(unsigned char) (0x55 ^ (_u2a[0x7F ^ uval] - 1)));
}
/* -------------------------------------------------------------------------------*/
static void cvtXXalaw16K(PACMDRVSTREAMINSTANCE adsi,
const unsigned char* src, LPDWORD srcsize,
unsigned char* dst, LPDWORD dstsize)
{
DWORD len = min(*srcsize, *dstsize / 2);
DWORD i;
short w;
*srcsize = len;
*dstsize = len * 2;
for (i = 0; i < len; i++)
{
w = alaw2linear(*src++);
W16(dst, w); dst += 2;
}
}
static void cvtXX16alawK(PACMDRVSTREAMINSTANCE adsi,
const unsigned char* src, LPDWORD srcsize,
unsigned char* dst, LPDWORD dstsize)
{
DWORD len = min(*srcsize / 2, *dstsize);
DWORD i;
*srcsize = len * 2;
*dstsize = len;
for (i = 0; i < len; i++)
{
*dst++ = linear2alaw(R16(src)); src += 2;
}
}
static void cvtXXulaw16K(PACMDRVSTREAMINSTANCE adsi,
const unsigned char* src, LPDWORD srcsize,
unsigned char* dst, LPDWORD dstsize)
{
DWORD len = min(*srcsize, *dstsize / 2);
DWORD i;
short w;
*srcsize = len;
*dstsize = len * 2;
for (i = 0; i < len; i++)
{
w = ulaw2linear(*src++);
W16(dst, w); dst += 2;
}
}
static void cvtXX16ulawK(PACMDRVSTREAMINSTANCE adsi,
const unsigned char* src, LPDWORD srcsize,
unsigned char* dst, LPDWORD dstsize)
{
DWORD len = min(*srcsize / 2, *dstsize);
DWORD i;
*srcsize = len * 2;
*dstsize = len;
for (i = 0; i < len; i++)
{
*dst++ = linear2ulaw(R16(src)); src += 2;
}
}
static void cvtXXalawulawK(PACMDRVSTREAMINSTANCE adsi,
const unsigned char* src, LPDWORD srcsize,
unsigned char* dst, LPDWORD dstsize)
{
DWORD len = min(*srcsize, *dstsize);
DWORD i;
*srcsize = len;
*dstsize = len;
for (i = 0; i < len; i++)
*dst++ = alaw2ulaw(*src++);
}
static void cvtXXulawalawK(PACMDRVSTREAMINSTANCE adsi,
const unsigned char* src, LPDWORD srcsize,
unsigned char* dst, LPDWORD dstsize)
{
DWORD len = min(*srcsize, *dstsize);
DWORD i;
*srcsize = len;
*dstsize = len;
for (i = 0; i < len; i++)
*dst++ = ulaw2alaw(*src++);
}
/***********************************************************************
* G711_DriverDetails
*
*/
static LRESULT G711_DriverDetails(PACMDRIVERDETAILSW add)
{
add->fccType = ACMDRIVERDETAILS_FCCTYPE_AUDIOCODEC;
add->fccComp = ACMDRIVERDETAILS_FCCCOMP_UNDEFINED;
add->wMid = 0xFF;
add->wPid = 0x00;
add->vdwACM = 0x01000000;
add->vdwDriver = 0x01000000;
add->fdwSupport = ACMDRIVERDETAILS_SUPPORTF_CODEC;
add->cFormatTags = 3; /* PCM, G711 A-LAW & MU-LAW */
add->cFilterTags = 0;
add->hicon = NULL;
MultiByteToWideChar( CP_ACP, 0, "WINE-G711", -1,
add->szShortName, sizeof(add->szShortName)/sizeof(WCHAR) );
MultiByteToWideChar( CP_ACP, 0, "Wine G711 converter", -1,
add->szLongName, sizeof(add->szLongName)/sizeof(WCHAR) );
MultiByteToWideChar( CP_ACP, 0, "Brought to you by the Wine team...", -1,
add->szCopyright, sizeof(add->szCopyright)/sizeof(WCHAR) );
MultiByteToWideChar( CP_ACP, 0, "Refer to LICENSE file", -1,
add->szLicensing, sizeof(add->szLicensing)/sizeof(WCHAR) );
add->szFeatures[0] = 0;
return MMSYSERR_NOERROR;
}
/***********************************************************************
* G711_FormatTagDetails
*
*/
static LRESULT G711_FormatTagDetails(PACMFORMATTAGDETAILSW aftd, DWORD dwQuery)
{
static const WCHAR szPcm[]={'P','C','M',0};
static const WCHAR szALaw[]={'A','-','L','a','w',0};
static const WCHAR szULaw[]={'U','-','L','a','w',0};
switch (dwQuery)
{
case ACM_FORMATTAGDETAILSF_INDEX:
if (aftd->dwFormatTagIndex >= 3) return ACMERR_NOTPOSSIBLE;
break;
case ACM_FORMATTAGDETAILSF_LARGESTSIZE:
if (aftd->dwFormatTag == WAVE_FORMAT_UNKNOWN)
{
aftd->dwFormatTagIndex = 1;
break;
}
/* fall thru */
case ACM_FORMATTAGDETAILSF_FORMATTAG:
switch (aftd->dwFormatTag)
{
case WAVE_FORMAT_PCM: aftd->dwFormatTagIndex = 0; break;
case WAVE_FORMAT_ALAW: aftd->dwFormatTagIndex = 1; break;
case WAVE_FORMAT_MULAW: aftd->dwFormatTagIndex = 2; break;
default: return ACMERR_NOTPOSSIBLE;
}
break;
default:
WARN("Unsupported query %08x\n", dwQuery);
return MMSYSERR_NOTSUPPORTED;
}
aftd->fdwSupport = ACMDRIVERDETAILS_SUPPORTF_CODEC;
switch (aftd->dwFormatTagIndex)
{
case 0:
aftd->dwFormatTag = WAVE_FORMAT_PCM;
aftd->cbFormatSize = sizeof(PCMWAVEFORMAT);
aftd->cStandardFormats = NUM_PCM_FORMATS;
lstrcpyW(aftd->szFormatTag, szPcm);
break;
case 1:
aftd->dwFormatTag = WAVE_FORMAT_ALAW;
aftd->cbFormatSize = sizeof(WAVEFORMATEX);
aftd->cStandardFormats = NUM_ALAW_FORMATS;
lstrcpyW(aftd->szFormatTag, szALaw);
break;
case 2:
aftd->dwFormatTag = WAVE_FORMAT_MULAW;
aftd->cbFormatSize = sizeof(WAVEFORMATEX);
aftd->cStandardFormats = NUM_ULAW_FORMATS;
lstrcpyW(aftd->szFormatTag, szULaw);
break;
}
return MMSYSERR_NOERROR;
}
/***********************************************************************
* G711_FormatDetails
*
*/
static LRESULT G711_FormatDetails(PACMFORMATDETAILSW afd, DWORD dwQuery)
{
switch (dwQuery)
{
case ACM_FORMATDETAILSF_FORMAT:
if (G711_GetFormatIndex(afd->pwfx) == 0xFFFFFFFF) return ACMERR_NOTPOSSIBLE;
break;
case ACM_FORMATDETAILSF_INDEX:
afd->pwfx->wFormatTag = afd->dwFormatTag;
switch (afd->dwFormatTag)
{
case WAVE_FORMAT_PCM:
if (afd->dwFormatIndex >= NUM_PCM_FORMATS) return ACMERR_NOTPOSSIBLE;
afd->pwfx->nChannels = PCM_Formats[afd->dwFormatIndex].nChannels;
afd->pwfx->nSamplesPerSec = PCM_Formats[afd->dwFormatIndex].rate;
afd->pwfx->wBitsPerSample = PCM_Formats[afd->dwFormatIndex].nBits;
afd->pwfx->nBlockAlign = afd->pwfx->nChannels * 2;
afd->pwfx->nAvgBytesPerSec = afd->pwfx->nSamplesPerSec * afd->pwfx->nBlockAlign;
break;
case WAVE_FORMAT_ALAW:
if (afd->dwFormatIndex >= NUM_ALAW_FORMATS) return ACMERR_NOTPOSSIBLE;
afd->pwfx->nChannels = ALaw_Formats[afd->dwFormatIndex].nChannels;
afd->pwfx->nSamplesPerSec = ALaw_Formats[afd->dwFormatIndex].rate;
afd->pwfx->wBitsPerSample = ALaw_Formats[afd->dwFormatIndex].nBits;
afd->pwfx->nBlockAlign = ALaw_Formats[afd->dwFormatIndex].nChannels;
afd->pwfx->nAvgBytesPerSec = afd->pwfx->nSamplesPerSec * afd->pwfx->nChannels;
afd->pwfx->cbSize = 0;
break;
case WAVE_FORMAT_MULAW:
if (afd->dwFormatIndex >= NUM_ULAW_FORMATS) return ACMERR_NOTPOSSIBLE;
afd->pwfx->nChannels = ULaw_Formats[afd->dwFormatIndex].nChannels;
afd->pwfx->nSamplesPerSec = ULaw_Formats[afd->dwFormatIndex].rate;
afd->pwfx->wBitsPerSample = ULaw_Formats[afd->dwFormatIndex].nBits;
afd->pwfx->nBlockAlign = ULaw_Formats[afd->dwFormatIndex].nChannels;
afd->pwfx->nAvgBytesPerSec = afd->pwfx->nSamplesPerSec * afd->pwfx->nChannels;
afd->pwfx->cbSize = 0;
break;
default:
WARN("Unsupported tag %08x\n", afd->dwFormatTag);
return MMSYSERR_INVALPARAM;
}
break;
default:
WARN("Unsupported query %08x\n", dwQuery);
return MMSYSERR_NOTSUPPORTED;
}
afd->fdwSupport = ACMDRIVERDETAILS_SUPPORTF_CODEC;
afd->szFormat[0] = 0; /* let MSACM format this for us... */
return MMSYSERR_NOERROR;
}
/***********************************************************************
* G711_FormatSuggest
*
*/
static LRESULT G711_FormatSuggest(PACMDRVFORMATSUGGEST adfs)
{
/* some tests ... */
if (adfs->cbwfxSrc < sizeof(PCMWAVEFORMAT) ||
adfs->cbwfxDst < sizeof(PCMWAVEFORMAT) ||
G711_GetFormatIndex(adfs->pwfxSrc) == 0xFFFFFFFF) return ACMERR_NOTPOSSIBLE;
/* FIXME: should do those tests against the real size (according to format tag */
/* If no suggestion for destination, then copy source value */
if (!(adfs->fdwSuggest & ACM_FORMATSUGGESTF_NCHANNELS))
adfs->pwfxDst->nChannels = adfs->pwfxSrc->nChannels;
if (!(adfs->fdwSuggest & ACM_FORMATSUGGESTF_NSAMPLESPERSEC))
adfs->pwfxDst->nSamplesPerSec = adfs->pwfxSrc->nSamplesPerSec;
if (!(adfs->fdwSuggest & ACM_FORMATSUGGESTF_WBITSPERSAMPLE))
{
if (adfs->pwfxSrc->wFormatTag == WAVE_FORMAT_PCM)
adfs->pwfxDst->wBitsPerSample = 8;
else
adfs->pwfxDst->wBitsPerSample = 16;
}
if (!(adfs->fdwSuggest & ACM_FORMATSUGGESTF_WFORMATTAG))
{
switch (adfs->pwfxSrc->wFormatTag)
{
case WAVE_FORMAT_PCM: adfs->pwfxDst->wFormatTag = WAVE_FORMAT_ALAW; break;
case WAVE_FORMAT_ALAW: adfs->pwfxDst->wFormatTag = WAVE_FORMAT_PCM; break;
case WAVE_FORMAT_MULAW: adfs->pwfxDst->wFormatTag = WAVE_FORMAT_PCM; break;
}
}
/* check if result is ok */
if (G711_GetFormatIndex(adfs->pwfxDst) == 0xFFFFFFFF) return ACMERR_NOTPOSSIBLE;
/* recompute other values */
switch (adfs->pwfxDst->wFormatTag)
{
case WAVE_FORMAT_PCM:
adfs->pwfxDst->nBlockAlign = adfs->pwfxDst->nChannels;
adfs->pwfxDst->nAvgBytesPerSec = adfs->pwfxDst->nSamplesPerSec * adfs->pwfxDst->nBlockAlign;
break;
case WAVE_FORMAT_ALAW:
adfs->pwfxDst->nBlockAlign = adfs->pwfxDst->nChannels * 2;
adfs->pwfxDst->nAvgBytesPerSec = adfs->pwfxDst->nSamplesPerSec * adfs->pwfxSrc->nChannels * 2;
break;
case WAVE_FORMAT_MULAW:
adfs->pwfxDst->nBlockAlign = adfs->pwfxDst->nChannels * 2;
adfs->pwfxDst->nAvgBytesPerSec = adfs->pwfxDst->nSamplesPerSec * adfs->pwfxSrc->nChannels * 2;
break;
default:
FIXME("\n");
break;
}
return MMSYSERR_NOERROR;
}
/***********************************************************************
* G711_Reset
*
*/
static void G711_Reset(PACMDRVSTREAMINSTANCE adsi, AcmG711Data* aad)
{
}
/***********************************************************************
* G711_StreamOpen
*
*/
static LRESULT G711_StreamOpen(PACMDRVSTREAMINSTANCE adsi)
{
AcmG711Data* aad;
assert(!(adsi->fdwOpen & ACM_STREAMOPENF_ASYNC));
if (G711_GetFormatIndex(adsi->pwfxSrc) == 0xFFFFFFFF ||
G711_GetFormatIndex(adsi->pwfxDst) == 0xFFFFFFFF)
return ACMERR_NOTPOSSIBLE;
aad = HeapAlloc(GetProcessHeap(), 0, sizeof(AcmG711Data));
if (aad == 0) return MMSYSERR_NOMEM;
adsi->dwDriver = (DWORD)aad;
if (adsi->pwfxSrc->wFormatTag == WAVE_FORMAT_PCM &&
adsi->pwfxDst->wFormatTag == WAVE_FORMAT_PCM)
{
goto theEnd;
}
else if (adsi->pwfxSrc->wFormatTag == WAVE_FORMAT_ALAW &&
adsi->pwfxDst->wFormatTag == WAVE_FORMAT_PCM)
{
/* resampling or mono <=> stereo not available
* G711 algo only define 16 bit per sample output
*/
if (adsi->pwfxSrc->nSamplesPerSec != adsi->pwfxDst->nSamplesPerSec ||
adsi->pwfxSrc->nChannels != adsi->pwfxDst->nChannels ||
adsi->pwfxDst->wBitsPerSample != 16)
goto theEnd;
/* g711 A-Law decoding... */
if (adsi->pwfxDst->wBitsPerSample == 16)
aad->convert = cvtXXalaw16K;
}
else if (adsi->pwfxSrc->wFormatTag == WAVE_FORMAT_PCM &&
adsi->pwfxDst->wFormatTag == WAVE_FORMAT_ALAW)
{
if (adsi->pwfxSrc->nSamplesPerSec != adsi->pwfxDst->nSamplesPerSec ||
adsi->pwfxSrc->nChannels != adsi->pwfxDst->nChannels ||
adsi->pwfxSrc->wBitsPerSample != 16)
goto theEnd;
/* g711 coding... */
if (adsi->pwfxSrc->wBitsPerSample == 16)
aad->convert = cvtXX16alawK;
}
else if (adsi->pwfxSrc->wFormatTag == WAVE_FORMAT_MULAW &&
adsi->pwfxDst->wFormatTag == WAVE_FORMAT_PCM)
{
/* resampling or mono <=> stereo not available
* G711 algo only define 16 bit per sample output
*/
if (adsi->pwfxSrc->nSamplesPerSec != adsi->pwfxDst->nSamplesPerSec ||
adsi->pwfxSrc->nChannels != adsi->pwfxDst->nChannels ||
adsi->pwfxDst->wBitsPerSample != 16)
goto theEnd;
/* g711 MU-Law decoding... */
if (adsi->pwfxDst->wBitsPerSample == 16)
aad->convert = cvtXXulaw16K;
}
else if (adsi->pwfxSrc->wFormatTag == WAVE_FORMAT_PCM &&
adsi->pwfxDst->wFormatTag == WAVE_FORMAT_MULAW)
{
if (adsi->pwfxSrc->nSamplesPerSec != adsi->pwfxDst->nSamplesPerSec ||
adsi->pwfxSrc->nChannels != adsi->pwfxDst->nChannels ||
adsi->pwfxSrc->wBitsPerSample != 16)
goto theEnd;
/* g711 coding... */
if (adsi->pwfxSrc->wBitsPerSample == 16)
aad->convert = cvtXX16ulawK;
}
else if (adsi->pwfxSrc->wFormatTag == WAVE_FORMAT_MULAW &&
adsi->pwfxDst->wFormatTag == WAVE_FORMAT_ALAW)
{
if (adsi->pwfxSrc->nSamplesPerSec != adsi->pwfxDst->nSamplesPerSec ||
adsi->pwfxSrc->nChannels != adsi->pwfxDst->nChannels)
goto theEnd;
/* MU-Law => A-Law... */
aad->convert = cvtXXulawalawK;
}
else if (adsi->pwfxSrc->wFormatTag == WAVE_FORMAT_ALAW &&
adsi->pwfxDst->wFormatTag == WAVE_FORMAT_MULAW)
{
if (adsi->pwfxSrc->nSamplesPerSec != adsi->pwfxDst->nSamplesPerSec ||
adsi->pwfxSrc->nChannels != adsi->pwfxDst->nChannels)
goto theEnd;
/* A-Law => MU-Law... */
aad->convert = cvtXXalawulawK;
}
else goto theEnd;
G711_Reset(adsi, aad);
return MMSYSERR_NOERROR;
theEnd:
HeapFree(GetProcessHeap(), 0, aad);
adsi->dwDriver = 0L;
return MMSYSERR_NOTSUPPORTED;
}
/***********************************************************************
* G711_StreamClose
*
*/
static LRESULT G711_StreamClose(PACMDRVSTREAMINSTANCE adsi)
{
HeapFree(GetProcessHeap(), 0, (void*)adsi->dwDriver);
return MMSYSERR_NOERROR;
}
/***********************************************************************
* G711_StreamSize
*
*/
static LRESULT G711_StreamSize(PACMDRVSTREAMINSTANCE adsi, PACMDRVSTREAMSIZE adss)
{
switch (adss->fdwSize)
{
case ACM_STREAMSIZEF_DESTINATION:
/* cbDstLength => cbSrcLength */
if (adsi->pwfxSrc->wFormatTag == WAVE_FORMAT_PCM &&
(adsi->pwfxDst->wFormatTag == WAVE_FORMAT_ALAW ||
adsi->pwfxDst->wFormatTag == WAVE_FORMAT_MULAW))
{
adss->cbSrcLength = adss->cbDstLength / 2;
}
else if ((adsi->pwfxSrc->wFormatTag == WAVE_FORMAT_ALAW ||
adsi->pwfxSrc->wFormatTag == WAVE_FORMAT_MULAW) &&
adsi->pwfxDst->wFormatTag == WAVE_FORMAT_PCM)
{
adss->cbSrcLength = adss->cbDstLength * 2;
}
else if ((adsi->pwfxSrc->wFormatTag == WAVE_FORMAT_ALAW ||
adsi->pwfxSrc->wFormatTag == WAVE_FORMAT_MULAW) &&
(adsi->pwfxDst->wFormatTag == WAVE_FORMAT_ALAW ||
adsi->pwfxDst->wFormatTag == WAVE_FORMAT_MULAW))
{
adss->cbSrcLength = adss->cbDstLength;
}
else
{
return MMSYSERR_NOTSUPPORTED;
}
break;
case ACM_STREAMSIZEF_SOURCE:
/* cbSrcLength => cbDstLength */
if (adsi->pwfxSrc->wFormatTag == WAVE_FORMAT_PCM &&
(adsi->pwfxDst->wFormatTag == WAVE_FORMAT_ALAW ||
adsi->pwfxDst->wFormatTag == WAVE_FORMAT_MULAW))
{
adss->cbDstLength = adss->cbSrcLength * 2;
}
else if ((adsi->pwfxSrc->wFormatTag == WAVE_FORMAT_ALAW ||
adsi->pwfxSrc->wFormatTag == WAVE_FORMAT_MULAW) &&
adsi->pwfxDst->wFormatTag == WAVE_FORMAT_PCM)
{
adss->cbDstLength = adss->cbSrcLength / 2;
}
else if ((adsi->pwfxSrc->wFormatTag == WAVE_FORMAT_ALAW ||
adsi->pwfxSrc->wFormatTag == WAVE_FORMAT_MULAW) &&
(adsi->pwfxDst->wFormatTag == WAVE_FORMAT_ALAW ||
adsi->pwfxDst->wFormatTag == WAVE_FORMAT_MULAW))
{
adss->cbDstLength = adss->cbSrcLength;
}
else
{
return MMSYSERR_NOTSUPPORTED;
}
break;
default:
WARN("Unsupported query %08x\n", adss->fdwSize);
return MMSYSERR_NOTSUPPORTED;
}
FIXME("\n");
return MMSYSERR_NOERROR;
}
/***********************************************************************
* G711_StreamConvert
*
*/
static LRESULT G711_StreamConvert(PACMDRVSTREAMINSTANCE adsi, PACMDRVSTREAMHEADER adsh)
{
AcmG711Data* aad = (AcmG711Data*)adsi->dwDriver;
DWORD nsrc = adsh->cbSrcLength;
DWORD ndst = adsh->cbDstLength;
if (adsh->fdwConvert &
~(ACM_STREAMCONVERTF_BLOCKALIGN|
ACM_STREAMCONVERTF_END|
ACM_STREAMCONVERTF_START))
{
FIXME("Unsupported fdwConvert (%08x), ignoring it\n", adsh->fdwConvert);
}
/* ACM_STREAMCONVERTF_BLOCKALIGN
* currently all conversions are block aligned, so do nothing for this flag
* ACM_STREAMCONVERTF_END
* no pending data, so do nothing for this flag
*/
if ((adsh->fdwConvert & ACM_STREAMCONVERTF_START))
{
G711_Reset(adsi, aad);
}
aad->convert(adsi, adsh->pbSrc, &nsrc, adsh->pbDst, &ndst);
adsh->cbSrcLengthUsed = nsrc;
adsh->cbDstLengthUsed = ndst;
return MMSYSERR_NOERROR;
}
/**************************************************************************
* G711_DriverProc [exported]
*/
LRESULT CALLBACK G711_DriverProc(DWORD_PTR dwDevID, HDRVR hDriv, UINT wMsg,
LPARAM dwParam1, LPARAM dwParam2)
{
TRACE("(%08lx %p %04x %08lx %08lx);\n",
dwDevID, hDriv, wMsg, dwParam1, dwParam2);
switch (wMsg)
{
case DRV_LOAD: return 1;
case DRV_FREE: return 1;
case DRV_OPEN: return G711_drvOpen((LPSTR)dwParam1);
case DRV_CLOSE: return G711_drvClose(dwDevID);
case DRV_ENABLE: return 1;
case DRV_DISABLE: return 1;
case DRV_QUERYCONFIGURE: return 1;
case DRV_CONFIGURE: MessageBoxA(0, "MS G711 (a-Law & mu-Law) filter !", "Wine Driver", MB_OK); return 1;
case DRV_INSTALL: return DRVCNF_RESTART;
case DRV_REMOVE: return DRVCNF_RESTART;
case ACMDM_DRIVER_NOTIFY:
/* no caching from other ACM drivers is done so far */
return MMSYSERR_NOERROR;
case ACMDM_DRIVER_DETAILS:
return G711_DriverDetails((PACMDRIVERDETAILSW)dwParam1);
case ACMDM_FORMATTAG_DETAILS:
return G711_FormatTagDetails((PACMFORMATTAGDETAILSW)dwParam1, dwParam2);
case ACMDM_FORMAT_DETAILS:
return G711_FormatDetails((PACMFORMATDETAILSW)dwParam1, dwParam2);
case ACMDM_FORMAT_SUGGEST:
return G711_FormatSuggest((PACMDRVFORMATSUGGEST)dwParam1);
case ACMDM_STREAM_OPEN:
return G711_StreamOpen((PACMDRVSTREAMINSTANCE)dwParam1);
case ACMDM_STREAM_CLOSE:
return G711_StreamClose((PACMDRVSTREAMINSTANCE)dwParam1);
case ACMDM_STREAM_SIZE:
return G711_StreamSize((PACMDRVSTREAMINSTANCE)dwParam1, (PACMDRVSTREAMSIZE)dwParam2);
case ACMDM_STREAM_CONVERT:
return G711_StreamConvert((PACMDRVSTREAMINSTANCE)dwParam1, (PACMDRVSTREAMHEADER)dwParam2);
case ACMDM_HARDWARE_WAVE_CAPS_INPUT:
case ACMDM_HARDWARE_WAVE_CAPS_OUTPUT:
/* this converter is not a hardware driver */
case ACMDM_FILTERTAG_DETAILS:
case ACMDM_FILTER_DETAILS:
/* this converter is not a filter */
case ACMDM_STREAM_RESET:
/* only needed for asynchronous driver... we aren't, so just say it */
return MMSYSERR_NOTSUPPORTED;
case ACMDM_STREAM_PREPARE:
case ACMDM_STREAM_UNPREPARE:
/* nothing special to do here... so don't do anything */
return MMSYSERR_NOERROR;
default:
return DefDriverProc(dwDevID, hDriv, wMsg, dwParam1, dwParam2);
}
}
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