mp3_playback.c

编译后直接运行的ＭＰ３播放器全部Ｃ语言源代码 一个包含FAT文件系统、系统引导 Boot、FLASH Driver等内容的

/***************************************************************************
 *             __________               __   ___.
 *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
 *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
 *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
 *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
 *                     \/            \/     \/    \/            \/
 * $Id: mp3_playback.c,v 1.6 2004/03/02 11:32:59 linusnielsen Exp $
 *
 * Code that has been in mpeg.c before, now creating an encapsulated play
 * data module, to be used by other sources than file playback as well.
 *
 * Copyright (C) 2004 by Linus Nielsen Feltzing
 *
 * All files in this archive are subject to the GNU General Public License.
 * See the file COPYING in the source tree root for full license agreement.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 ****************************************************************************/
#include <stdbool.h>
#include "config.h"
#include "debug.h"
#include "panic.h"
#include <kernel.h>
#include "mpeg.h" /* ToDo: remove crosslinks */
#include "mp3_playback.h"
#ifndef SIMULATOR
#include "i2c.h"
#include "mas.h"
#include "dac.h"
#include "system.h"
#include "hwcompat.h"
#endif

/* hacking into mpeg.c, recording is still there */
#ifdef HAVE_MAS3587F
enum
{
    MPEG_DECODER,
    MPEG_ENCODER
} mpeg_mode;
#endif /* #ifdef HAVE_MAS3587F */

/**** globals ****/

/* own version, independent of mpeg.c */
static bool paused; /* playback is paused */
static bool playing; /* We are playing an MP3 stream */

#ifndef SIMULATOR
/* for measuring the play time */
static long playstart_tick;
static long cumulative_ticks;

/* the registered callback function to ask for more mp3 data */
static void (*callback_for_more)(unsigned char**, int*);
#endif /* #ifndef SIMULATOR */

static char *units[] =
{
    "%",    /* Volume */
    "dB",   /* Bass */
    "dB",   /* Treble */
    "%",    /* Balance */
    "dB",   /* Loudness */
    "%",    /* Bass boost */
    "",     /* AVC */
    "",     /* Channels */
    "dB",   /* Left gain */
    "dB",   /* Right gain */
    "dB",   /* Mic gain */
};

static int numdecimals[] =
{
    0,    /* Volume */
    0,    /* Bass */
    0,    /* Treble */
    0,    /* Balance */
    0,    /* Loudness */
    0,    /* Bass boost */
    0,    /* AVC */
    0,    /* Channels */
    1,    /* Left gain */
    1,    /* Right gain */
    1,    /* Mic gain */
};

static int minval[] =
{
    0,    /* Volume */
    0,    /* Bass */
    0,    /* Treble */
    -50,  /* Balance */
    0,    /* Loudness */
    0,    /* Bass boost */
    -1,   /* AVC */
    0,    /* Channels */
    0,    /* Left gain */
    0,    /* Right gain */
    0,    /* Mic gain */
};

static int maxval[] =
{
    100,  /* Volume */
#ifdef HAVE_MAS3587F
    24,   /* Bass */
    24,   /* Treble */
#else
    30,   /* Bass */
    30,   /* Treble */
#endif
    50,   /* Balance */
    17,   /* Loudness */
    10,   /* Bass boost */
    3,    /* AVC */
    6,    /* Channels */
    15,   /* Left gain */
    15,   /* Right gain */
    15,   /* Mic gain */
};

static int defaultval[] =
{
    70,   /* Volume */
#ifdef HAVE_MAS3587F
    12+6, /* Bass */
    12+6, /* Treble */
#else
    15+7, /* Bass */
    15+7, /* Treble */
#endif
    0,    /* Balance */
    0,    /* Loudness */
    0,    /* Bass boost */
    0,    /* AVC */
    0,    /* Channels */
    8,    /* Left gain */
    8,    /* Right gain */
    2,    /* Mic gain */
};

char *mpeg_sound_unit(int setting)
{
    return units[setting];
}

int mpeg_sound_numdecimals(int setting)
{
    return numdecimals[setting];
}

int mpeg_sound_min(int setting)
{
    return minval[setting];
}

int mpeg_sound_max(int setting)
{
    return maxval[setting];
}

int mpeg_sound_default(int setting)
{
    return defaultval[setting];
}

/* list of tracks in memory */
#define MAX_ID3_TAGS (1<<4) /* Must be power of 2 */
#define MAX_ID3_TAGS_MASK (MAX_ID3_TAGS - 1)

#ifndef SIMULATOR
static bool mpeg_is_initialized = false;
#endif

#ifndef SIMULATOR

unsigned long mas_version_code;

#ifdef HAVE_MAS3507D

static unsigned int bass_table[] =
{
    0x9e400, /* -15dB */
    0xa2800, /* -14dB */
    0xa7400, /* -13dB */
    0xac400, /* -12dB */
    0xb1800, /* -11dB */
    0xb7400, /* -10dB */
    0xbd400, /* -9dB */
    0xc3c00, /* -8dB */
    0xca400, /* -7dB */
    0xd1800, /* -6dB */
    0xd8c00, /* -5dB */
    0xe0400, /* -4dB */
    0xe8000, /* -3dB */
    0xefc00, /* -2dB */
    0xf7c00, /* -1dB */
    0,
    0x800,   /* 1dB */
    0x10000, /* 2dB */
    0x17c00, /* 3dB */
    0x1f800, /* 4dB */
    0x27000, /* 5dB */
    0x2e400, /* 6dB */
    0x35800, /* 7dB */
    0x3c000, /* 8dB */
    0x42800, /* 9dB */
    0x48800, /* 10dB */
    0x4e400, /* 11dB */
    0x53800, /* 12dB */
    0x58800, /* 13dB */
    0x5d400, /* 14dB */
    0x61800  /* 15dB */
};

static unsigned int treble_table[] =
{
    0xb2c00, /* -15dB */
    0xbb400, /* -14dB */
    0xc1800, /* -13dB */
    0xc6c00, /* -12dB */
    0xcbc00, /* -11dB */
    0xd0400, /* -10dB */
    0xd5000, /* -9dB */
    0xd9800, /* -8dB */
    0xde000, /* -7dB */
    0xe2800, /* -6dB */
    0xe7e00, /* -5dB */
    0xec000, /* -4dB */
    0xf0c00, /* -3dB */
    0xf5c00, /* -2dB */
    0xfac00, /* -1dB */
    0,
    0x5400,  /* 1dB */
    0xac00,  /* 2dB */
    0x10400, /* 3dB */
    0x16000, /* 4dB */
    0x1c000, /* 5dB */
    0x22400, /* 6dB */
    0x28400, /* 7dB */
    0x2ec00, /* 8dB */
    0x35400, /* 9dB */
    0x3c000, /* 10dB */
    0x42c00, /* 11dB */
    0x49c00, /* 12dB */
    0x51800, /* 13dB */
    0x58400, /* 14dB */
    0x5f800  /* 15dB */
};

static unsigned int prescale_table[] =
{
    0x80000,  /* 0db */
    0x8e000,  /* 1dB */
    0x9a400,  /* 2dB */
    0xa5800, /* 3dB */
    0xaf400, /* 4dB */
    0xb8000, /* 5dB */
    0xbfc00, /* 6dB */
    0xc6c00, /* 7dB */
    0xcd000, /* 8dB */
    0xd25c0, /* 9dB */
    0xd7800, /* 10dB */
    0xdc000, /* 11dB */
    0xdfc00, /* 12dB */
    0xe3400, /* 13dB */
    0xe6800, /* 14dB */
    0xe9400  /* 15dB */
};
#endif

bool dma_on;  /* The DMA is active */

#ifdef HAVE_MAS3507D
static void mas_poll_start(int interval_in_ms)
{
    unsigned int count;

    count = (FREQ * interval_in_ms) / 1000 / 8;

    if(count > 0xffff)
    {
        panicf("Error! The MAS poll interval is too long (%d ms)\n",
               interval_in_ms);
        return;
    }
    
    /* We are using timer 1 */
    
    TSTR &= ~0x02; /* Stop the timer */
    TSNC &= ~0x02; /* No synchronization */
    TMDR &= ~0x02; /* Operate normally */

    TCNT1 = 0;   /* Start counting at 0 */
    GRA1 = count;
    TCR1 = 0x23; /* Clear at GRA match, sysclock/8 */

    /* Enable interrupt on level 5 */
    IPRC = (IPRC & ~0x000f) | 0x0005;
    
    TSR1 &= ~0x02;
    TIER1 = 0xf9; /* Enable GRA match interrupt */

    TSTR |= 0x02; /* Start timer 1 */
}
#else
static void postpone_dma_tick(void)
{
    unsigned int count;

    count = FREQ / 1000 / 8;

    /* We are using timer 1 */
    
    TSTR &= ~0x02; /* Stop the timer */
    TSNC &= ~0x02; /* No synchronization */
    TMDR &= ~0x02; /* Operate normally */

    TCNT1 = 0;   /* Start counting at 0 */
    GRA1 = count;
    TCR1 = 0x23; /* Clear at GRA match, sysclock/8 */

    /* Enable interrupt on level 5 */
    IPRC = (IPRC & ~0x000f) | 0x0005;
    
    TSR1 &= ~0x02;
    TIER1 = 0xf9; /* Enable GRA match interrupt */

    TSTR |= 0x02; /* Start timer 1 */
}
#endif


#ifdef HAVE_MAS3587F
void demand_irq_enable(bool on)
{
    int oldlevel = set_irq_level(HIGHEST_IRQ_LEVEL);
    
    if(on)
    {
        IPRA = (IPRA & 0xfff0) | 0x000b;
        ICR &= ~0x0010; /* IRQ3 level sensitive */
    }
    else
        IPRA &= 0xfff0;

    set_irq_level(oldlevel);
}
#endif /* #ifdef HAVE_MAS3587F */


void play_tick(void)
{
    if(playing && !paused)
    {
        /* Start DMA if it is disabled and the DEMAND pin is high */
        if(!(SCR0 & 0x80) && (PBDR & 0x4000))
        {
            SCR0 |= 0x80;
        }

        playback_tick(); /* dirty call to mpeg.c */
    }
}

#pragma interrupt
void DEI3(void)
{
    unsigned char* start;
    int size = 0;

    if (callback_for_more != NULL)
    {
        callback_for_more(&start, &size);
    }
    
    if (size > 0)
    {
        DTCR3 = size & 0xffff;
        SAR3 = (unsigned int) start;
    }
    else
    {
        CHCR3 &= ~0x0001; /* Disable the DMA interrupt */
    }

    CHCR3 &= ~0x0002; /* Clear DMA interrupt */
}

#pragma interrupt
void IMIA1(void) /* Timer 1 interrupt */
{
    if(playing)
        play_tick();
    TSR1 &= ~0x01;
#ifdef HAVE_MAS3587F
    /* Disable interrupt */
    IPRC &= ~0x000f;
#endif /* #ifdef HAVE_MAS3587F */
}

#pragma interrupt
void IRQ6(void) /* PB14: MAS stop demand IRQ */
{
    SCR0 &= ~0x80;
}

#ifdef HAVE_MAS3587F
#pragma interrupt
void IRQ3(void) /* PA15: MAS demand IRQ */
{
    /* Begin with setting the IRQ to edge sensitive */
    ICR |= 0x0010;
    
    if(mpeg_mode == MPEG_ENCODER)
        rec_tick();
    else
        postpone_dma_tick();
}
#endif /* #ifdef HAVE_MAS3587F */

static void setup_sci0(void)
{
    /* PB15 is I/O, PB14 is IRQ6, PB12 is SCK0, PB9 is TxD0 */
    PBCR1 = (PBCR1 & 0x0cff) | 0x1208;
    
    /* Set PB12 to output */
    or_b(0x10, &PBIORH);

    /* Disable serial port */
    SCR0 = 0x00;

    /* Synchronous, no prescale */
    SMR0 = 0x80;

    /* Set baudrate 1Mbit/s */
    BRR0 = 0x03;

    /* use SCK as serial clock output */
    SCR0 = 0x01;

    /* Clear FER and PER */
    SSR0 &= 0xe7;

    /* Set interrupt ITU2 and SCI0 priority to 0 */
    IPRD &= 0x0ff0;

    /* set PB15 and PB14 to inputs */
     and_b(~0x80, &PBIORH);
     and_b(~0x40, &PBIORH);

    /* Enable End of DMA interrupt at prio 8 */
    IPRC = (IPRC & 0xf0ff) | 0x0800;
    
    /* Enable Tx (only!) */
    SCR0 |= 0x20;
}
#endif /* SIMULATOR */

#ifdef HAVE_MAS3587F
static void init_playback(void)
{
    unsigned long val;
    int rc;

    mp3_play_pause(false);
    
    mas_reset();
    
    /* Enable the audio CODEC and the DSP core, max analog voltage range */
    rc = mas_direct_config_write(MAS_CONTROL, 0x8c00);
    if(rc < 0)
        panicf("mas_ctrl_w: %d", rc);

    /* Stop the current application */
    val = 0;
    mas_writemem(MAS_BANK_D0,0x7f6,&val,1);    
    do
    {
        mas_readmem(MAS_BANK_D0, 0x7f7, &val, 1);
    } while(val);
    
    /* Enable the D/A Converter */
    mas_codec_writereg(0x0, 0x0001);

    /* ADC scale 0%, DSP scale 100% */
    mas_codec_writereg(6, 0x0000);
    mas_codec_writereg(7, 0x4000);

    /* Disable SDO and SDI */
    val = 0x0d;
    mas_writemem(MAS_BANK_D0,0x7f2,&val,1);

    /* Set Demand mode and validate all settings */
    val = 0x25;
    mas_writemem(MAS_BANK_D0,0x7f1,&val,1);

    /* Start the Layer2/3 decoder applications */
    val = 0x0c;
    mas_writemem(MAS_BANK_D0,0x7f6,&val,1);
    do
    {
        mas_readmem(MAS_BANK_D0, 0x7f7, &val, 1);
    } while((val & 0x0c) != 0x0c);

    mpeg_sound_channel_config(MPEG_SOUND_STEREO);

    mpeg_mode = MPEG_DECODER;

    /* set IRQ6 to edge detect */
    ICR |= 0x02;

    /* set IRQ6 prio 8 */
    IPRB = ( IPRB & 0xff0f ) | 0x0080;

    DEBUGF("MAS Decoding application started\n");
}
#endif /* #ifdef HAVE_MAS3587F */

#ifndef SIMULATOR
#ifdef HAVE_MAS3507D
int current_left_volume = 0;  /* all values in tenth of dB */
int current_right_volume = 0;  /* all values in tenth of dB */
int current_treble = 0;
int current_bass = 0;
int current_balance = 0;

/* convert tenth of dB volume to register value */
static int tenthdb2reg(int db) {
    if (db < -540)
        return (db + 780) / 30;
    else
        return (db + 660) / 15;
}

void set_prescaled_volume(void)
{
    int prescale;
    int l, r;

    prescale = MAX(current_bass, current_treble);
    if (prescale < 0)
        prescale = 0;  /* no need to prescale if we don't boost
                          bass or treble */