drivers/mxc/vpu-encoder-b0/vpu_encoder_rpc.c - nest-learning-thermostat/6.0/linux-imx-4.9.88 - Git at Google

 /*
  * This file is provided under a dual BSD/GPLv2 license.  When using or
  * redistributing this file, you may do so under either license.
  *
  * GPL LICENSE SUMMARY
  *
  * Copyright(c) 2018 NXP. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of version 2 of the GNU General Public License as
  * published by the Free Software Foundation.
  *
  * This program 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
  * General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  * The full GNU General Public License is included in this distribution
  * in the file called LICENSE.GPL.
  *
  * BSD LICENSE
  *
  * Copyright(c) 2018 NXP. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  *   * Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  *   * Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in
  *     the documentation and/or other materials provided with the
  *     distribution.
  *   * Neither the name of Intel Corporation nor the names of its
  *     contributors may be used to endorse or promote products derived
  *     from this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */

 #include "vpu_encoder_rpc.h"

 void rpc_init_shared_memory_encoder(struct shared_addr *This,
 		unsigned long long base_phy_addr,
 		void *base_virt_addr,
 		u_int32 total_size)
 {
 	pENC_RPC_HOST_IFACE pSharedInterface;
 	unsigned int phy_addr;
 	unsigned int i;
 	unsigned int temp_addr;
 	BUFFER_DESCRIPTOR_TYPE *pSharedCmdBufDescPtr;
 	BUFFER_DESCRIPTOR_TYPE *pSharedMsgBufDescPtr;
 	pMEDIA_ENC_API_CONTROL_INTERFACE pEncCtrlInterface;

 	This->shared_mem_phy = base_phy_addr;
 	This->shared_mem_vir = base_virt_addr;
 	This->base_offset = (unsigned long long)(base_virt_addr - base_phy_addr);

 	pSharedInterface = (pENC_RPC_HOST_IFACE)This->shared_mem_vir;
 	This->pSharedInterface = pSharedInterface;

 	pSharedInterface->FwExecBaseAddr = base_phy_addr;
 	pSharedInterface->FwExecAreaSize = total_size;

 	pSharedCmdBufDescPtr = (BUFFER_DESCRIPTOR_TYPE *)&pSharedInterface->StreamCmdBufferDesc;
 	pSharedMsgBufDescPtr = (BUFFER_DESCRIPTOR_TYPE *)&pSharedInterface->StreamMsgBufferDesc;

 	phy_addr = base_phy_addr + sizeof(ENC_RPC_HOST_IFACE);
 	This->cmd_mem_phy = phy_addr;
 	This->cmd_mem_vir = This->shared_mem_vir + sizeof(ENC_RPC_HOST_IFACE);

 	pSharedCmdBufDescPtr->wptr = phy_addr;
 	pSharedCmdBufDescPtr->rptr = pSharedCmdBufDescPtr->wptr;
 	pSharedCmdBufDescPtr->start = pSharedCmdBufDescPtr->wptr;
 	pSharedCmdBufDescPtr->end = pSharedCmdBufDescPtr->start + CMD_SIZE;

 	phy_addr += CMD_SIZE;
 	This->msg_mem_phy = phy_addr;
 	This->msg_mem_vir = This->cmd_mem_vir + CMD_SIZE;

 	pSharedMsgBufDescPtr->wptr = phy_addr;
 	pSharedMsgBufDescPtr->rptr = pSharedMsgBufDescPtr->wptr;
 	pSharedMsgBufDescPtr->start = pSharedMsgBufDescPtr->wptr;
 	pSharedMsgBufDescPtr->end = pSharedMsgBufDescPtr->start + MSG_SIZE;

 	phy_addr += MSG_SIZE;

 	for (i = 0; i < VPU_MAX_NUM_STREAMS; i++) {
 		pSharedInterface->pEncCtrlInterface[i] = phy_addr;
 		phy_addr += sizeof(MEDIA_ENC_API_CONTROL_INTERFACE);
 	}

 	for (i = 0; i < VPU_MAX_NUM_STREAMS; i++) {
 		temp_addr = pSharedInterface->pEncCtrlInterface[i];
 		pEncCtrlInterface = (pMEDIA_ENC_API_CONTROL_INTERFACE)(temp_addr + This->base_offset);
 		pEncCtrlInterface->pEncYUVBufferDesc = phy_addr;
 		phy_addr += sizeof(MEDIAIP_ENC_YUV_BUFFER_DESC);
 		pEncCtrlInterface->pEncStreamBufferDesc = phy_addr;
 		phy_addr += sizeof(BUFFER_DESCRIPTOR_TYPE);
 		pEncCtrlInterface->pEncExpertModeParam = phy_addr;
 		phy_addr += sizeof(MEDIAIP_ENC_EXPERT_MODE_PARAM);
 		pEncCtrlInterface->pEncParam = phy_addr;
 		phy_addr += sizeof(MEDIAIP_ENC_PARAM);
 		pEncCtrlInterface->pEncMemPool = phy_addr;
 		phy_addr += sizeof(MEDIAIP_ENC_MEM_POOL);
 		pEncCtrlInterface->pEncEncodingStatus = phy_addr;
 		phy_addr += sizeof(ENC_ENCODING_STATUS);
 		pEncCtrlInterface->pEncDSAStatus = phy_addr;
 		phy_addr += sizeof(ENC_DSA_STATUS_t);
 	}
 }

 void rpc_set_system_cfg_value_encoder(void *Interface, u_int32 regs_base)
 {
 	pENC_RPC_HOST_IFACE pSharedInterface;
 	MEDIAIP_FW_SYSTEM_CONFIG *pSystemCfg;

 	pSharedInterface = (pENC_RPC_HOST_IFACE)Interface;
 	pSystemCfg = &pSharedInterface->sSystemCfg;
 	pSystemCfg->uNumWindsors = 1;
 	pSystemCfg->uWindsorIrqPin[0x0][0x0] = 0x4; // PAL_IRQ_WINDSOR_LOW
 	pSystemCfg->uWindsorIrqPin[0x0][0x1] = 0x5; // PAL_IRQ_WINDSOR_HI
 	pSystemCfg->uMaloneBaseAddress[0] = (unsigned int)(regs_base + 0x180000);
 	pSystemCfg->uWindsorBaseAddress[0] = (unsigned int)(regs_base + 0x800000);
 	pSystemCfg->uMaloneBaseAddress[0x1] = 0x0;
 	pSystemCfg->uHifOffset[0x0] = 0x1C000;
 	pSystemCfg->uHifOffset[0x1] = 0x0;

 	pSystemCfg->uDPVBaseAddr = 0x0;
 	pSystemCfg->uDPVIrqPin = 0x0;
 	pSystemCfg->uPixIfBaseAddr = (unsigned int)(regs_base + 0x180000 + 0x20000);
 	pSystemCfg->uFSLCacheBaseAddr = (unsigned int)(regs_base + 0x60000);
 }

 u_int32 rpc_MediaIPFW_Video_buffer_space_check_encoder(BUFFER_DESCRIPTOR_TYPE *pBufDesc,
 	BOOL bFull,
 	u_int32 uSize,
 	u_int32 *puUpdateAddress)
 {
 	u_int32 uPtr1;
 	u_int32 uPtr2;
 	u_int32 start;
 	u_int32 end;
 	u_int32 uTemp;

 	/* bFull is FALSE when send message, write data   */
 	/* bFull is TRUE when process commands, read data */
 	uPtr1 = (bFull) ? pBufDesc->rptr : pBufDesc->wptr;
 	uPtr2 = (bFull) ? pBufDesc->wptr : pBufDesc->rptr;

 	if (uPtr1 == uPtr2) {
 		if (bFull)
 			/* No data at all to read */
 			return 0;
 		else {
 			/* wrt pointer equal to read pointer thus the     */
 			/* buffer is completely empty for further writes  */
 			start = pBufDesc->start;
 			end   = pBufDesc->end;
 			/* The address to be returned in this case is for */
 			/* the updated write pointer.                     */
 			uTemp = uPtr1 + uSize;
 			if (uTemp >= end)
 				uTemp += (start - end);
 			*puUpdateAddress = uTemp;
 			return (end - start);
 		}
 	} else if (uPtr1 < uPtr2) {
 		/* return updated rd pointer address                */
 		/* In this case if size was too big - we expect the */
 		/* external ftn to compare the size against the     */
 		/* space returned.
 		 */
 		*puUpdateAddress = uPtr1 + uSize;
 		return (uPtr2 - uPtr1);
 	}
 	/* We know the system has looped!! */
 	start = pBufDesc->start;
 	end   = pBufDesc->end;
 	uTemp  = uPtr1 + uSize;
 	if (uTemp >= end)
 		uTemp += (start - end);
 	*puUpdateAddress = uTemp;
 	return ((end - uPtr1) + (uPtr2 - start));
 }

 static void rpc_update_cmd_buffer_ptr_encoder(BUFFER_DESCRIPTOR_TYPE *pCmdDesc)
 {
 	u_int32 uWritePtr;

 	uWritePtr = pCmdDesc->wptr + 4;
 	if (uWritePtr >= pCmdDesc->end)
 		uWritePtr = pCmdDesc->start;
 	pCmdDesc->wptr = uWritePtr;
 }

 void rpc_send_cmd_buf_encoder(struct shared_addr *This,
 		u_int32 idx,
 		u_int32 cmdid,
 		u_int32 cmdnum,
 		u_int32 *local_cmddata)
 {
 	pENC_RPC_HOST_IFACE pSharedInterface = (pENC_RPC_HOST_IFACE)This->shared_mem_vir;
 	BUFFER_DESCRIPTOR_TYPE *pCmdDesc = &pSharedInterface->StreamCmdBufferDesc;
 	u_int32 *cmddata;
 	u_int32 i;
 	u_int32 *cmdword = (u_int32 *)(This->cmd_mem_vir+pCmdDesc->wptr - pCmdDesc->start);

 	*cmdword |= ((idx & 0x000000ff) << 24);
 	*cmdword |= ((cmdnum & 0x000000ff) << 16);
 	*cmdword |= ((cmdid & 0x00003fff) << 0);
 	rpc_update_cmd_buffer_ptr_encoder(pCmdDesc);

 	for (i = 0; i < cmdnum; i++) {
 		cmddata = (u_int32 *)(This->cmd_mem_vir+pCmdDesc->wptr - pCmdDesc->start);
 		*cmddata = local_cmddata[i];
 		rpc_update_cmd_buffer_ptr_encoder(pCmdDesc);
 	}
 }

 u_int32 rpc_MediaIPFW_Video_message_check_encoder(struct shared_addr *This)
 {
 	u_int32 uSpace;
 	u_int32 uIgnore;
 	pENC_RPC_HOST_IFACE pSharedInterface = (pENC_RPC_HOST_IFACE)This->shared_mem_vir;
 	BUFFER_DESCRIPTOR_TYPE *pMsgDesc = &pSharedInterface->StreamMsgBufferDesc;
 	u_int32 msgword;
 	u_int32 msgnum;

 	uSpace = rpc_MediaIPFW_Video_buffer_space_check_encoder(pMsgDesc, TRUE, 0, &uIgnore);
 	uSpace = (uSpace >> 2);
 	if (uSpace) {
 		/* get current msgword word */
 		msgword      = *((u_int32 *)(This->msg_mem_vir+pMsgDesc->rptr - pMsgDesc->start));
 		/* Find the number of additional words */
 		msgnum  = ((msgword & 0x00ff0000) >> 16);

 		/*
 		 * * Check the number of message words against
 		 * * 1) a limit - some sort of maximum or at least
 		 * * the size of the SW buffer the message is read into
 		 * * 2) The space reported (where space is write ptr - read ptr in 32bit words)
 		 * * It must be less than space (as opposed to <=) because
 		 * * the message itself is not included in msgword
 		 */
 		if (msgnum < VID_API_MESSAGE_LIMIT) {
 			if (msgnum < uSpace)
 				return API_MSG_AVAILABLE;
 			else
 				return API_MSG_INCOMPLETE;
 		} else
 			return API_MSG_BUFFER_ERROR;
 	}
 	return API_MSG_UNAVAILABLE;
 }

 static void rpc_update_msg_buffer_ptr_encoder(BUFFER_DESCRIPTOR_TYPE *pMsgDesc)
 {
 	u_int32 uReadPtr;

 	uReadPtr = pMsgDesc->rptr + 4;
 	if (uReadPtr >= pMsgDesc->end)
 		uReadPtr = pMsgDesc->start;
 	pMsgDesc->rptr = uReadPtr;
 }

 void rpc_receive_msg_buf_encoder(struct shared_addr *This, struct event_msg *msg)
 {
 	unsigned int i;
 	pENC_RPC_HOST_IFACE pSharedInterface = (pENC_RPC_HOST_IFACE)This->shared_mem_vir;
 	BUFFER_DESCRIPTOR_TYPE *pMsgDesc = &pSharedInterface->StreamMsgBufferDesc;
 	u_int32 msgword = *((u_int32 *)(This->msg_mem_vir+pMsgDesc->rptr - pMsgDesc->start));

 	msg->idx = ((msgword & 0xff000000) >> 24);
 	msg->msgnum = ((msgword & 0x00ff0000) >> 16);
 	msg->msgid = ((msgword & 0x00003fff) >> 0);
 	rpc_update_msg_buffer_ptr_encoder(pMsgDesc);

 	for (i = 0; i < msg->msgnum; i++) {
 		msg->msgdata[i] = *((u_int32 *)(This->msg_mem_vir+pMsgDesc->rptr - pMsgDesc->start));
 		rpc_update_msg_buffer_ptr_encoder(pMsgDesc);
 	}
 }
	/*
	* This file is provided under a dual BSD/GPLv2 license. When using or
	* redistributing this file, you may do so under either license.
	*
	* GPL LICENSE SUMMARY
	*
	* Copyright(c) 2018 NXP. All rights reserved.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of version 2 of the GNU General Public License as
	* published by the Free Software Foundation.
	*
	* This program 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
	* General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
	* The full GNU General Public License is included in this distribution
	* in the file called LICENSE.GPL.
	*
	* BSD LICENSE
	*
	* Copyright(c) 2018 NXP. All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	*
	* * Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* * Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in
	* the documentation and/or other materials provided with the
	* distribution.
	* * Neither the name of Intel Corporation nor the names of its
	* contributors may be used to endorse or promote products derived
	* from this software without specific prior written permission.
	*
	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*/

	#include "vpu_encoder_rpc.h"

	void rpc_init_shared_memory_encoder(struct shared_addr *This,
	unsigned long long base_phy_addr,
	void *base_virt_addr,
	u_int32 total_size)
	{
	pENC_RPC_HOST_IFACE pSharedInterface;
	unsigned int phy_addr;
	unsigned int i;
	unsigned int temp_addr;
	BUFFER_DESCRIPTOR_TYPE *pSharedCmdBufDescPtr;
	BUFFER_DESCRIPTOR_TYPE *pSharedMsgBufDescPtr;
	pMEDIA_ENC_API_CONTROL_INTERFACE pEncCtrlInterface;

	This->shared_mem_phy = base_phy_addr;
	This->shared_mem_vir = base_virt_addr;
	This->base_offset = (unsigned long long)(base_virt_addr - base_phy_addr);

	pSharedInterface = (pENC_RPC_HOST_IFACE)This->shared_mem_vir;
	This->pSharedInterface = pSharedInterface;

	pSharedInterface->FwExecBaseAddr = base_phy_addr;
	pSharedInterface->FwExecAreaSize = total_size;

	pSharedCmdBufDescPtr = (BUFFER_DESCRIPTOR_TYPE *)&pSharedInterface->StreamCmdBufferDesc;
	pSharedMsgBufDescPtr = (BUFFER_DESCRIPTOR_TYPE *)&pSharedInterface->StreamMsgBufferDesc;

	phy_addr = base_phy_addr + sizeof(ENC_RPC_HOST_IFACE);
	This->cmd_mem_phy = phy_addr;
	This->cmd_mem_vir = This->shared_mem_vir + sizeof(ENC_RPC_HOST_IFACE);

	pSharedCmdBufDescPtr->wptr = phy_addr;
	pSharedCmdBufDescPtr->rptr = pSharedCmdBufDescPtr->wptr;
	pSharedCmdBufDescPtr->start = pSharedCmdBufDescPtr->wptr;
	pSharedCmdBufDescPtr->end = pSharedCmdBufDescPtr->start + CMD_SIZE;

	phy_addr += CMD_SIZE;
	This->msg_mem_phy = phy_addr;
	This->msg_mem_vir = This->cmd_mem_vir + CMD_SIZE;

	pSharedMsgBufDescPtr->wptr = phy_addr;
	pSharedMsgBufDescPtr->rptr = pSharedMsgBufDescPtr->wptr;
	pSharedMsgBufDescPtr->start = pSharedMsgBufDescPtr->wptr;
	pSharedMsgBufDescPtr->end = pSharedMsgBufDescPtr->start + MSG_SIZE;

	phy_addr += MSG_SIZE;

	for (i = 0; i < VPU_MAX_NUM_STREAMS; i++) {
	pSharedInterface->pEncCtrlInterface[i] = phy_addr;
	phy_addr += sizeof(MEDIA_ENC_API_CONTROL_INTERFACE);
	}

	for (i = 0; i < VPU_MAX_NUM_STREAMS; i++) {
	temp_addr = pSharedInterface->pEncCtrlInterface[i];
	pEncCtrlInterface = (pMEDIA_ENC_API_CONTROL_INTERFACE)(temp_addr + This->base_offset);
	pEncCtrlInterface->pEncYUVBufferDesc = phy_addr;
	phy_addr += sizeof(MEDIAIP_ENC_YUV_BUFFER_DESC);
	pEncCtrlInterface->pEncStreamBufferDesc = phy_addr;
	phy_addr += sizeof(BUFFER_DESCRIPTOR_TYPE);
	pEncCtrlInterface->pEncExpertModeParam = phy_addr;
	phy_addr += sizeof(MEDIAIP_ENC_EXPERT_MODE_PARAM);
	pEncCtrlInterface->pEncParam = phy_addr;
	phy_addr += sizeof(MEDIAIP_ENC_PARAM);
	pEncCtrlInterface->pEncMemPool = phy_addr;
	phy_addr += sizeof(MEDIAIP_ENC_MEM_POOL);
	pEncCtrlInterface->pEncEncodingStatus = phy_addr;
	phy_addr += sizeof(ENC_ENCODING_STATUS);
	pEncCtrlInterface->pEncDSAStatus = phy_addr;
	phy_addr += sizeof(ENC_DSA_STATUS_t);
	}
	}

	void rpc_set_system_cfg_value_encoder(void *Interface, u_int32 regs_base)
	{
	pENC_RPC_HOST_IFACE pSharedInterface;
	MEDIAIP_FW_SYSTEM_CONFIG *pSystemCfg;

	pSharedInterface = (pENC_RPC_HOST_IFACE)Interface;
	pSystemCfg = &pSharedInterface->sSystemCfg;
	pSystemCfg->uNumWindsors = 1;
	pSystemCfg->uWindsorIrqPin[0x0][0x0] = 0x4; // PAL_IRQ_WINDSOR_LOW
	pSystemCfg->uWindsorIrqPin[0x0][0x1] = 0x5; // PAL_IRQ_WINDSOR_HI
	pSystemCfg->uMaloneBaseAddress[0] = (unsigned int)(regs_base + 0x180000);
	pSystemCfg->uWindsorBaseAddress[0] = (unsigned int)(regs_base + 0x800000);
	pSystemCfg->uMaloneBaseAddress[0x1] = 0x0;
	pSystemCfg->uHifOffset[0x0] = 0x1C000;
	pSystemCfg->uHifOffset[0x1] = 0x0;

	pSystemCfg->uDPVBaseAddr = 0x0;
	pSystemCfg->uDPVIrqPin = 0x0;
	pSystemCfg->uPixIfBaseAddr = (unsigned int)(regs_base + 0x180000 + 0x20000);
	pSystemCfg->uFSLCacheBaseAddr = (unsigned int)(regs_base + 0x60000);
	}

	u_int32 rpc_MediaIPFW_Video_buffer_space_check_encoder(BUFFER_DESCRIPTOR_TYPE *pBufDesc,
	BOOL bFull,
	u_int32 uSize,
	u_int32 *puUpdateAddress)
	{
	u_int32 uPtr1;
	u_int32 uPtr2;
	u_int32 start;
	u_int32 end;
	u_int32 uTemp;

	/* bFull is FALSE when send message, write data */
	/* bFull is TRUE when process commands, read data */
	uPtr1 = (bFull) ? pBufDesc->rptr : pBufDesc->wptr;
	uPtr2 = (bFull) ? pBufDesc->wptr : pBufDesc->rptr;

	if (uPtr1 == uPtr2) {
	if (bFull)
	/* No data at all to read */
	return 0;
	else {
	/* wrt pointer equal to read pointer thus the */
	/* buffer is completely empty for further writes */
	start = pBufDesc->start;
	end = pBufDesc->end;
	/* The address to be returned in this case is for */
	/* the updated write pointer. */
	uTemp = uPtr1 + uSize;
	if (uTemp >= end)
	uTemp += (start - end);
	*puUpdateAddress = uTemp;
	return (end - start);
	}
	} else if (uPtr1 < uPtr2) {
	/* return updated rd pointer address */
	/* In this case if size was too big - we expect the */
	/* external ftn to compare the size against the */
	/* space returned.
	*/
	*puUpdateAddress = uPtr1 + uSize;
	return (uPtr2 - uPtr1);
	}
	/* We know the system has looped!! */
	start = pBufDesc->start;
	end = pBufDesc->end;
	uTemp = uPtr1 + uSize;
	if (uTemp >= end)
	uTemp += (start - end);
	*puUpdateAddress = uTemp;
	return ((end - uPtr1) + (uPtr2 - start));
	}

	static void rpc_update_cmd_buffer_ptr_encoder(BUFFER_DESCRIPTOR_TYPE *pCmdDesc)
	{
	u_int32 uWritePtr;

	uWritePtr = pCmdDesc->wptr + 4;
	if (uWritePtr >= pCmdDesc->end)
	uWritePtr = pCmdDesc->start;
	pCmdDesc->wptr = uWritePtr;
	}

	void rpc_send_cmd_buf_encoder(struct shared_addr *This,
	u_int32 idx,
	u_int32 cmdid,
	u_int32 cmdnum,
	u_int32 *local_cmddata)
	{
	pENC_RPC_HOST_IFACE pSharedInterface = (pENC_RPC_HOST_IFACE)This->shared_mem_vir;
	BUFFER_DESCRIPTOR_TYPE *pCmdDesc = &pSharedInterface->StreamCmdBufferDesc;
	u_int32 *cmddata;
	u_int32 i;
	u_int32 cmdword = (u_int32 )(This->cmd_mem_vir+pCmdDesc->wptr - pCmdDesc->start);

	*cmdword \|= ((idx & 0x000000ff) << 24);
	*cmdword \|= ((cmdnum & 0x000000ff) << 16);
	*cmdword \|= ((cmdid & 0x00003fff) << 0);
	rpc_update_cmd_buffer_ptr_encoder(pCmdDesc);

	for (i = 0; i < cmdnum; i++) {
	cmddata = (u_int32 *)(This->cmd_mem_vir+pCmdDesc->wptr - pCmdDesc->start);
	*cmddata = local_cmddata[i];
	rpc_update_cmd_buffer_ptr_encoder(pCmdDesc);
	}
	}

	u_int32 rpc_MediaIPFW_Video_message_check_encoder(struct shared_addr *This)
	{
	u_int32 uSpace;
	u_int32 uIgnore;
	pENC_RPC_HOST_IFACE pSharedInterface = (pENC_RPC_HOST_IFACE)This->shared_mem_vir;
	BUFFER_DESCRIPTOR_TYPE *pMsgDesc = &pSharedInterface->StreamMsgBufferDesc;
	u_int32 msgword;
	u_int32 msgnum;

	uSpace = rpc_MediaIPFW_Video_buffer_space_check_encoder(pMsgDesc, TRUE, 0, &uIgnore);
	uSpace = (uSpace >> 2);
	if (uSpace) {
	/* get current msgword word */
	msgword = ((u_int32 )(This->msg_mem_vir+pMsgDesc->rptr - pMsgDesc->start));
	/* Find the number of additional words */
	msgnum = ((msgword & 0x00ff0000) >> 16);

	/*
	* * Check the number of message words against
	* * 1) a limit - some sort of maximum or at least
	* * the size of the SW buffer the message is read into
	* * 2) The space reported (where space is write ptr - read ptr in 32bit words)
	* * It must be less than space (as opposed to <=) because
	* * the message itself is not included in msgword
	*/
	if (msgnum < VID_API_MESSAGE_LIMIT) {
	if (msgnum < uSpace)
	return API_MSG_AVAILABLE;
	else
	return API_MSG_INCOMPLETE;
	} else
	return API_MSG_BUFFER_ERROR;
	}
	return API_MSG_UNAVAILABLE;
	}

	static void rpc_update_msg_buffer_ptr_encoder(BUFFER_DESCRIPTOR_TYPE *pMsgDesc)
	{
	u_int32 uReadPtr;

	uReadPtr = pMsgDesc->rptr + 4;
	if (uReadPtr >= pMsgDesc->end)
	uReadPtr = pMsgDesc->start;
	pMsgDesc->rptr = uReadPtr;
	}

	void rpc_receive_msg_buf_encoder(struct shared_addr This, struct event_msg msg)
	{
	unsigned int i;
	pENC_RPC_HOST_IFACE pSharedInterface = (pENC_RPC_HOST_IFACE)This->shared_mem_vir;
	BUFFER_DESCRIPTOR_TYPE *pMsgDesc = &pSharedInterface->StreamMsgBufferDesc;
	u_int32 msgword = ((u_int32 )(This->msg_mem_vir+pMsgDesc->rptr - pMsgDesc->start));

	msg->idx = ((msgword & 0xff000000) >> 24);
	msg->msgnum = ((msgword & 0x00ff0000) >> 16);
	msg->msgid = ((msgword & 0x00003fff) >> 0);
	rpc_update_msg_buffer_ptr_encoder(pMsgDesc);

	for (i = 0; i < msg->msgnum; i++) {
	msg->msgdata[i] = ((u_int32 )(This->msg_mem_vir+pMsgDesc->rptr - pMsgDesc->start));
	rpc_update_msg_buffer_ptr_encoder(pMsgDesc);
	}
	}