start.c

codec engine中的视频操作界面的历程

/*
 * start.c
 *
 * ============================================================================
 * Copyright (c) Texas Instruments Inc 2005
 *
 * Use of this software is controlled by the terms and conditions found in the
 * license agreement under which this software has been supplied or provided.
 * ============================================================================
 */

/* Standard Linux headers */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

/* Davinci EVM utility libraries */
#include <msp430lib.h>
#include <simplewidget.h>

/* Application header file */
#include "interface.h"

#define START_PICTURE_NTSC  "data/pics/startup_ntsc.png"
#define START_PICTURE_PAL   "data/pics/startup_pal.png"

enum InitLevels {
    CREATEDINTERFACE = 1,
    MSP430LIBINITIALIZED
};

static simplewidget_screen  simpleScreen = NULL;
static simplewidget_png startImg         = NULL;

/******************************************************************************
 * uiCreate
 ******************************************************************************/
static int uiCreate(void)
{
    /* Initialize the screens on which to draw widgets */
    if (simplewidget_screen_init(getDisplay(), SCREEN_WIDTH,
                                 SCREEN_HEIGHT, &simpleScreen) == -1) {
        ERR("Failed to initialize simplewidget screen\n");
        return FAILURE;
    }

    if (getYFactor() == NTSC) {
        /* Create the images for the buttons at the bottom of the screen */
        if (simplewidget_png_create(START_PICTURE_NTSC, &startImg) == -1) {
            ERR("Failed to create png image\n");
            return FAILURE;
        }
    }
    else {
        /* Create the images for the buttons at the bottom of the screen */
        if (simplewidget_png_create(START_PICTURE_PAL, &startImg) == -1) {
            ERR("Failed to create png image\n");
            return FAILURE;
        }
    }

    return SUCCESS;
}

/******************************************************************************
 * uiDraw
 ******************************************************************************/
static int uiDraw(void)
{
    /* Clear the OSD window */
    simplewidget_screen_clear(simpleScreen, 0, 0, SCREEN_WIDTH, SCREEN_HEIGHT);

    if (simplewidget_png_show(startImg, simpleScreen, 0, 0) == -1) {
        ERR("Failed to show png image\n");
        return FAILURE;
    }

    return SUCCESS;
}

/******************************************************************************
 * uiDelete
 ******************************************************************************/
static int uiDelete(void)
{
    if (startImg) {
        simplewidget_png_delete(startImg);
    }

    if (simpleScreen) {
        simplewidget_screen_exit(simpleScreen);
    }

    return SUCCESS;
}

/******************************************************************************
 * keyAction
 ******************************************************************************/
static int keyAction(enum msp430lib_keycode key, DemoEnv *envp, int *quitPtr)
{
    switch(key) {
        case MSP430LIB_KEYCODE_PLAY:
            *quitPtr = TRUE;
            break;

        case MSP430LIB_KEYCODE_STOP:
            *quitPtr = NOSELECTION;
            break;

        default:
            DBG("Unknown button pressed.\n");
    }

    return SUCCESS;
}

/******************************************************************************
 * interfaceFxn
 ******************************************************************************/
int startupFxn(DemoEnv *envp)
{
    enum InitLevels        initLevel = 0;
    int                    status    = SUCCESS;
    int                    quit      = 0;
    enum msp430lib_keycode key;

    if (uiCreate() == FAILURE) {
        CLEANUP(FAILURE);
    }

    initLevel = CREATEDINTERFACE;

    if (setOsdTransparency(0x77) == FAILURE) {
        CLEANUP(FAILURE);
    }

    if (uiDraw() == FAILURE) {
        CLEANUP(FAILURE);
    }

    if (msp430lib_init() == MSP430LIB_FAILURE) {
        ERR("Failed to initialize msp430lib.\n");
        CLEANUP(FAILURE);
    }

    initLevel = MSP430LIBINITIALIZED;

    while (!quit) {
        /* See if an IR remote key has been pressed */
        if (msp430lib_get_ir_key(&key) == MSP430LIB_FAILURE) {
            ERR("Failed to get IR value.\n");
        }

        DBG("Got IR key %#x from the MSP430\n", key);

        /* If an IR key had been pressed, service it */
        if (key != 0) {
            if (keyAction(key, envp, &quit) == FAILURE) {
                BREAK_LOOP(FAILURE);
            }
        }

        usleep(500000);
    }

    if (quit == NOSELECTION) {
        status = NOSELECTION;
    }

cleanup:
    if (initLevel >= MSP430LIBINITIALIZED) {
        msp430lib_exit();
    }

    if (initLevel >= CREATEDINTERFACE) {
        uiDelete();
    }

    return status;
}