player.c

qt91上实现的mp3播放机,支持sam9260,参考用

/*!
 * Copyright (C) 2006-2007 by egnite Software GmbH. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 * 3. Neither the name of the copyright holders nor the names of
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY EGNITE SOFTWARE GMBH 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 EGNITE
 * SOFTWARE GMBH 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.
 *
 * For additional information see http://www.ethernut.de/
 */

/*!
 * \file player.c
 * \brief Player.
 *
 * \verbatim
 *
 * $Log$
 *
 * \endverbatim
 */

#include <cfg/os.h>
#include <cfg/clock.h>
#include <dev/board.h>
#include <sys/timer.h>
#include <sys/event.h>

#include <stdlib.h>
#include <string.h>

#include <stdio.h>

#include "tlv320dac.h"
#include "receiver.h"
#include "mp3player.h"

/*!
 * \brief Create a player instance.
 *
 * \param plugin Pointer to a player plug-in.
 *
 * \return On success, the pointer to a \ref PLAYERINFO structure is returned.
 *         A NULL pointer indicates an error.
 */
PLAYERINFO * PlayerCreate(PLAYERPLUGIN *plugin)
{
    PLAYERINFO *pip;

    /* Allocate and initialize the player info structure. */
    if ((pip = malloc(sizeof(PLAYERINFO))) != NULL) {
        memset(pip, 0, sizeof(PLAYERINFO));
        /* Associate a new player plug-in instance. */
        if ((*plugin->pp_create) (pip)) {
            free(pip);
            pip = NULL;
        }
    }
    return pip;
}

/*!
 * \brief Set player to a specified state.
 *
 * \param pip Pointer to a player info structure, obtained by a 
 *            previous call to PlayerCreate().
 * \param sst Status to set, typically PSTAT_START or PSTAT_STOP.
 * \param xst Status to wait for, like PSTAT_IDLE or PSTAT_RUNNING.
 *
 * \return 0 on success, -1 otherwise.
 */
static int PlayerPlugInControl(PLAYERINFO *pip, u_int sst, u_int xst)
{
    int retries = 10;

    /* Loop until we got the status or give up on too many retires. */
    while (pip->pi_status != xst) {
        pip->pi_status = sst;
        NutEventPost(&pip->pi_cmdevt);
        if (NutEventWait(&pip->pi_stsevt, 500)) {
            if (retries-- <= 0) {
                printf("No player control\n");
                return -1;
            }
        }
    }
    return 0;
}

/*!
 * \brief Retrieve the current player status.
 *
 * \param pip Pointer to a player info structure, obtained by a 
 *            previous call to PlayerCreate().
 *
 * \return Player status.
 */
u_int PlayerStatus(PLAYERINFO *pip)
{
    return pip->pi_status;
}

/*!
 * \brief Stop player.
 *
 * \param pip Player to stop. Pointer to a player info structure, 
 *            obtained by a previous call to PlayerCreate().
 *
 * \return 0 on success, -1 otherwise.
 */
int PlayerStop(PLAYERINFO *pip)
{
    printf("[PSTOP]");
    return PlayerPlugInControl(pip, PSTAT_STOP, PSTAT_IDLE);
}

/*!
 * \brief Start playing a specified receiver.
 *
 * \param pip Player to start. Pointer to a player info structure, 
 *            obtained by a previous call to PlayerCreate().
 * \param rip Receiver to play.
 *
 * \return 0 on success, -1 otherwise.
 */
int PlayerStart(PLAYERINFO *pip, RECEIVERINFO *rip)
{
    if (PlayerStop(pip)) {
        return -1;
    }
    printf("[PSTART]");
    pip->pi_rcvr = rip;

    return PlayerPlugInControl(pip, PSTAT_START, PSTAT_RUNNING);
}