www.pudn.com > JPEGMotion.rar > thrControl.c

/* 
 *  Copyright 2002 by Texas Instruments Incorporated. 
 *  All rights reserved. Property of Texas Instruments Incorporated. 
 *  Restricted rights to use, duplicate or disclose this code are 
 *  granted through contract. 
 * 
 */ 
/* "@(#) RF5_IEK 2.00.01 11-26-02 (swat-c18)" */ 
/* 
 *  ======== thrControl.c ======== 
 *  This file shows an example of sending messages from one thread to the 
 *  other using mailbox. 
 */ 
#include  
 
// DSP/BIOS includes 
#include  
#include  
 
// RF includes 
#include  
 
// application includes 
#include "appResources.h"   // application-wide common info 
#include "appThreads.h"     // thread-wide common info 
#include "thrControl.h" 
#include "appmain.h" 
 
#include "tskProcess.h"     /* contains thread specific information */ 
 
// global variables to be modified by GEL 
#define NUMCONTROLS 1    // same as the number of processing channels 
 
typedef struct ExternalControl 
{ 
    Int frameRatio[NUMCONTROLS]; 
    Int quality[NUMCONTROLS]; 
} ExternalControl; 
 
#pragma DATA_ALIGN(externalControl, 128); 
ExternalControl externalControl;        // GEL script writes here 
ExternalControl externalControlPrev;    // this is a local copy 
 
/* 
 *  ======== thrControlInit ======== 
 * 
 */ 
Void thrControlInit() 
{ 
    UTL_assert( NUMCONTROLS == 1 ); 
 
    // set the default frame ratio 
    externalControl.frameRatio[0] = 1;   // live video channel 
    externalControl.quality[0]    = 85; 
    externalControlPrev = externalControl; 
} 
 
void thrControlSet( int FrameRatio, int Quality ) 
{ 
    UTL_assert( NUMCONTROLS == 1 ); 
 
    // Keep the quality reasonable. File size increases 
    // about 60% between quality factors 95 and 100. 
    // Keep it 1-90. 
    if( (Quality-=10) < 1 ) 
        Quality = 1; 
 
    // set the default frame ratio 
    externalControl.frameRatio[0] = FrameRatio; 
    externalControl.quality[0]    = Quality; 
} 
 
 
/* 
 *  ======== thrControlStartup ======== 
 * 
 */ 
Void thrControlStartup() 
{ 
    Int chanNum; 
    CtrlMsg txMsg; 
 
    // send message to initialize the frame ratio 
    for( chanNum = 0; chanNum < NUMCONTROLS; chanNum++) 
    { 
        // Set-up initial values for frame ratio 
        txMsg.cmd = MSGFRAMECHANGE; 
        txMsg.arg1 = chanNum; 
        txMsg.arg2 = externalControl.frameRatio[chanNum]; 
 
        // Send the request 
        MBX_post( &mbxProcess, &txMsg, 0 ); 
 
        // Set-up initial values for new quality 
        txMsg.cmd  = MSGQUALCHANGE; 
        txMsg.arg1 = chanNum; 
        txMsg.arg2 = 0;     // JPEG encoder cell index 
        txMsg.arg3 = externalControl.quality[chanNum]; 
 
        // Send the request 
        MBX_post( &mbxProcess, &txMsg, 0 ); 
    } 
} 
 
/* 
 *  ======== thrControlRun ======== 
 * 
 *  Main function of Control task. 
 */ 
Void thrControlRun() 
{ 
    Int chanNum; 
    CtrlMsg txMsg; 
 
    // Main loop 
    while (TRUE) 
    { 
 
        // check for changes 
        for( chanNum = 0; chanNum < NUMCONTROLS; chanNum++) 
        { 
 
            // See if user requested a frame ratio change. 
            if( externalControl.frameRatio[chanNum] != 
                externalControlPrev.frameRatio[chanNum] ) 
            { 
 
                // new value entered 
                externalControlPrev.frameRatio[chanNum] = 
                    externalControl.frameRatio[chanNum]; 
 
                // send message to tell which channel has ratio changed 
                txMsg.cmd = MSGFRAMECHANGE; 
                txMsg.arg1 = chanNum; 
                txMsg.arg2 = externalControl.frameRatio[chanNum]; 
                MBX_post( &mbxProcess, &txMsg, 0 ); 
            } 
 
             // See if user requested a quality change. 
            if( externalControl.quality[chanNum] != 
                externalControlPrev.quality[chanNum] ) 
            { 
                 // new value entered 
                externalControlPrev.quality[chanNum] = 
                    externalControl.quality[chanNum]; 
 
                // send message to tell which channel has ratio changed 
                txMsg.cmd = MSGQUALCHANGE; 
                txMsg.arg1 = chanNum; 
                txMsg.arg2 = 0;       // JPEG encoder cell index 
                txMsg.arg3 = externalControl.quality[chanNum]; 
                MBX_post( &mbxProcess, &txMsg, 0 ); 
            } 
        } 
 
        // suspend self for 500 ticks, and then poll again 
        TSK_sleep( 500 ); 
    } 
}