path: root/sound/oss/dmasound/trans_16.c

/*
 *  linux/sound/oss/dmasound/trans_16.c
 *
 *  16 bit translation routines.  Only used by Power mac at present.
 *
 *  See linux/sound/oss/dmasound/dmasound_core.c for copyright and
 *  history prior to 08/02/2001.
 *
 *  08/02/2001 Iain Sandoe
 *		split from dmasound_awacs.c
 *  11/29/2003 Renzo Davoli (King Enzo)
 *  	- input resampling (for soft rate < hard rate)
 *  	- software line in gain control
 */

#include <linux/soundcard.h>
#include <asm/uaccess.h>
#include "dmasound.h"

extern int expand_bal;	/* Balance factor for expanding (not volume!) */
static short dmasound_alaw2dma16[] ;
static short dmasound_ulaw2dma16[] ;

static ssize_t pmac_ct_law(const u_char __user *userPtr, size_t userCount,
			   u_char frame[], ssize_t *frameUsed,
			   ssize_t frameLeft);
static ssize_t pmac_ct_s8(const u_char __user *userPtr, size_t userCount,
			  u_char frame[], ssize_t *frameUsed,
			  ssize_t frameLeft);
static ssize_t pmac_ct_u8(const u_char __user *userPtr, size_t userCount,
			  u_char frame[], ssize_t *frameUsed,
			  ssize_t frameLeft);
static ssize_t pmac_ct_s16(const u_char __user *userPtr, size_t userCount,
			   u_char frame[], ssize_t *frameUsed,
			   ssize_t frameLeft);
static ssize_t pmac_ct_u16(const u_char __user *userPtr, size_t userCount,
			   u_char frame[], ssize_t *frameUsed,
			   ssize_t frameLeft);

static ssize_t pmac_ctx_law(const u_char __user *userPtr, size_t userCount,
			    u_char frame[], ssize_t *frameUsed,
			    ssize_t frameLeft);
static ssize_t pmac_ctx_s8(const u_char __user *userPtr, size_t userCount,
			   u_char frame[], ssize_t *frameUsed,
			   ssize_t frameLeft);
static ssize_t pmac_ctx_u8(const u_char __user *userPtr, size_t userCount,
			   u_char frame[], ssize_t *frameUsed,
			   ssize_t frameLeft);
static ssize_t pmac_ctx_s16(const u_char __user *userPtr, size_t userCount,
			    u_char frame[], ssize_t *frameUsed,
			    ssize_t frameLeft);
static ssize_t pmac_ctx_u16(const u_char __user *userPtr, size_t userCount,
			    u_char frame[], ssize_t *frameUsed,
			    ssize_t frameLeft);

static ssize_t pmac_ct_s16_read(const u_char __user *userPtr, size_t userCount,
			   u_char frame[], ssize_t *frameUsed,
			   ssize_t frameLeft);
static ssize_t pmac_ct_u16_read(const u_char __user *userPtr, size_t userCount,
			   u_char frame[], ssize_t *frameUsed,
			   ssize_t frameLeft);

/*** Translations ************************************************************/

static int expand_data;	/* Data for expanding */

static ssize_t pmac_ct_law(const u_char __user *userPtr, size_t userCount,
			   u_char frame[], ssize_t *frameUsed,
			   ssize_t frameLeft)
{
	short *table = dmasound.soft.format == AFMT_MU_LAW
		? dmasound_ulaw2dma16 : dmasound_alaw2dma16;
	ssize_t count, used;
	short *p = (short *) &frame[*frameUsed];
	int val, stereo = dmasound.soft.stereo;

	frameLeft >>= 2;
	if (stereo)
		userCount >>= 1;
	used = count = min_t(unsigned long, userCount, frameLeft);
	while (count > 0) {
		u_char data;
		if (get_user(data, userPtr++))
			return -EFAULT;
		val = table[data];
		*p++ = val;
		if (stereo) {
			if (get_user(data, userPtr++))
				return -EFAULT;
			val = table[data];
		}
		*p++ = val;
		count--;
	}
	*frameUsed += used * 4;
	return stereo? used * 2: used;
}


static ssize_t pmac_ct_s8(const u_char __user *userPtr, size_t userCount,
			  u_char frame[], ssize_t *frameUsed,
			  ssize_t frameLeft)
{
	ssize_t count, used;
	short *p = (short *) &frame[*frameUsed];
	int val, stereo = dmasound.soft.stereo;

	frameLeft >>= 2;
	if (stereo)
		userCount >>= 1;
	used = count = min_t(unsigned long, userCount, frameLeft);
	while (count > 0) {
		u_char data;
		if (get_user(data, userPtr++))
			return -EFAULT;
		val = data << 8;
		*p++ = val;
		if (stereo) {
			if (get_user(data, userPtr++))
				return -EFAULT;
			val = data <<