wtaudioplay.c

MCF5249的音频驱动程序,可以实现PCM的实时播放和采集

      I6400WriteMem(0x2020,dwData&0xFFFF); //user_iic_ctrl Lower 16bits write

      dwAddress=0x2020;
      while(1)
           {
            WORD wLower16=I6400ReadMem(0x2020);
            if((wLower16&0x0002)==0)
                break;
           }
  //    pUserIIC++;
 //    }
 I6400WriteMem(0x2020,0);
 return;

}

void I6400I2CInit(int iic_select)
{
	switch (iic_select)
	{
	case 0:
		 I6400WriteUserIIC(BT829_320x240,0x88);
		 printf("BT829_320X240\n");
		 break;
	case 1:
		I6400WriteUserIIC(BT829_320x240,0x88);
		printf("---\n");
		sleep(2);
		I6400WriteUserIIC(BT829p_640x480,0x88);
		printf("BT829_640x480(829-PAL|||6400-NTSC\n");
		break;
	case 2:
		I6400WriteUserIIC(BT829_720x480,0x88);
		printf("BT829_720x480\n");
		break;
	case 4:
		I6400WriteUserIIC(BT829_320x288,0x88);
		printf("BT829_320x288\n");
		break;
	case 5:
		I6400WriteUserIIC(BT829_352x288,0x88);
		printf("BT829_352x288\n");
		break;
	case 6:
		I6400WriteUserIIC(BT829_704x576,0x88);
		printf("BT829_704x576\n");
		break;
	case 7:
		I6400WriteUserIIC(BT829_720x576,0x88);
		printf("BT829_720x576\n");
		break;
	case 8:
		I6400WriteUserIIC(BT829p_640x480,0x88);
		printf("BT829p_640x480\n");
		break;
	case 9:
		I6400WriteUserIIC(BT829_704x288,0x88);
		printf("BT829_704x288\n");
		break;
        case 10:
		I6400WriteUserIIC(BT829_640x240,0x88);
		printf("BT829_640x240\n");
		break;	
	default:
		I6400WriteUserIIC(BT829_320x240,0x88);
		printf("BT829_320X240\n");
		break;
	}

  return;
}

int Init829(void)
{
	//int select;
	char buffer[30];
	ReadValue(buffer,VIDEO_FORMAT,1);
	buffer[20]=0;
	printf(" requesting %s\n",buffer);
    	if(strcmp(buffer,"PAL 352*288")==0)
    	      I6400I2CInit(5);
    	else if(strcmp(buffer,"NTSC 320*240")==0)
    	      I6400I2CInit(0);
	else if(strcmp(buffer,"NTSC 640*480")==0)
    	      I6400I2CInit(1);
	else if(strcmp(buffer,"PAL 704*576")==0)
	      I6400I2CInit(6);
	else if(strcmp(buffer,"PAL 720*576")==0)
	      I6400I2CInit(7);
	else if(strcmp(buffer,"PAL 640*480")==0)
	      I6400I2CInit(8);
	else if(strcmp(buffer,"PAL 704*288")==0)
	      I6400I2CInit(9);
	else if(strcmp(buffer,"NTSC 640*240")==0)
	      I6400I2CInit(10);
    	else
    	     {
    	     	printf("VIDEO FORMAT ERROR.USE DEFAULT:352x288");
    	        I6400I2CInit(5);
    	      }
	
	printf("Initial BT829 I2C data finish!\n");
	
	return 0;

}

//============================================
void set_IME6400_audio(int Stereo)
{
//sample rate:8Khz
// output bit rate:Stereo 32Kbps
// Mono  128Kbps
       if(Stereo)
		I6400WriteMem(0x200C,0x11);
	else{
#ifdef _FWP16_
		I6400WriteMem(0x200C,0x44);//uPCM
#else _FWA16_
		I6400WriteMem(0x200C,0x84);//ADPCM
#endif
		}
		
	//I6400WriteMem(0x200E,0x0000);
	I6400WriteMem(0x200E,0x1000);//Enable Channel 0 audio
	
	                                                    
}
/////////////////////////////////////////////////////////////

void StartEncoding(void)
{	
	char buf[30];
//Audio
    	set_IME6400_audio(0); //1  for stereo ,0 for mono

	ReadValue(buf,BITRATE_CONTROL,1);
     if(strncmp(buf,"Vbr",3)==0)
    {
        printf("BITRATE_CONTROL:VBR\n");
        ReadValue(buf,VBR_INIT_QUALITY,1);
	if(atoi(buf)>31||atoi(buf)<1)
    	{
        	printf("VBR_INIT_QUALITY:%d\n",atoi(buf));        	
        	I6400WriteMem(0x2010,0xa);
    	}
	else{
		printf("VBR_INIT_QUALITY:%d\n",atoi(buf));        	
        	I6400WriteMem(0x2010,atoi(buf));		
	}		
    }        
        
//Time Increment
    I6400WriteMem(0x2008,30000/12.5);
    
//Start encoding
    I6400WriteReg(User4,0);
    //printf("g_i64Command=[%x:%x]\n",wComLower,wCfgUpper);
    I6400WriteMem(0x2002,0x0180);    
    I6400WriteMem(0x2000,0x0a99);
    printf("Start 6400 Encoding successfully!\n"); 
	
}

//***   auido  decoder/encoder

#define	AUDIO_ENCODING_ULAW	(1)	/* ISDN u-law */
#define	AUDIO_ENCODING_ALAW	(2)	/* ISDN A-law */
#define	AUDIO_ENCODING_LINEAR (3)	/* PCM 2's-complement (0-center) */
#define AUDIO_ENCODING_ADPCM (4) /*IMA ADPCM */

/*
 * g711.c
 *
 * u-law, A-law and linear PCM conversions.
 */
#define	SIGN_BIT	(0x80)		/* Sign bit for a A-law byte. */
#define	QUANT_MASK	(0xf)		/* Quantization field mask. */
#define	NSEGS		(8)		/* Number of A-law segments. */
#define	SEG_SHIFT	(4)		/* Left shift for segment number. */
#define	SEG_MASK	(0x70)		/* Segment field mask. */
#define CLIP            (8159)

static short seg_end[8] = {0xFF, 0x1FF, 0x3FF, 0x7FF,
			    0xFFF, 0x1FFF, 0x3FFF, 0x7FFF};

static short seg_aend[8] = {0x1F, 0x3F, 0x7F, 0xFF,
			    0x1FF, 0x3FF, 0x7FF, 0xFFF};
static short seg_uend[8] = {0x3F, 0x7F, 0xFF, 0x1FF,
			    0x3FF, 0x7FF, 0xFFF, 0x1FFF};

/* copy from CCITT G.711 specifications */
unsigned char _u2a[128] = {			/* u- to A-law conversions */
	1,	1,	2,	2,	3,	3,	4,	4,
	5,	5,	6,	6,	7,	7,	8,	8,
	9,	10,	11,	12,	13,	14,	15,	16,
	17,	18,	19,	20,	21,	22,	23,	24,
	25,	27,	29,	31,	33,	34,	35,	36,
	37,	38,	39,	40,	41,	42,	43,	44,
	46,	48,	49,	50,	51,	52,	53,	54,
	55,	56,	57,	58,	59,	60,	61,	62,
	64,	65,	66,	67,	68,	69,	70,	71,
	72,	73,	74,	75,	76,	77,	78,	79,
	81,	82,	83,	84,	85,	86,	87,	88,
	89,	90,	91,	92,	93,	94,	95,	96,
	97,	98,	99,	100,	101,	102,	103,	104,
	105,	106,	107,	108,	109,	110,	111,	112,
	113,	114,	115,	116,	117,	118,	119,	120,
	121,	122,	123,	124,	125,	126,	127,	128};

unsigned char _a2u[128] = {			/* A- to u-law conversions */
	1,	3,	5,	7,	9,	11,	13,	15,
	16,	17,	18,	19,	20,	21,	22,	23,
	24,	25,	26,	27,	28,	29,	30,	31,
	32,	32,	33,	33,	34,	34,	35,	35,
	36,	37,	38,	39,	40,	41,	42,	43,
	44,	45,	46,	47,	48,	48,	49,	49,
	50,	51,	52,	53,	54,	55,	56,	57,
	58,	59,	60,	61,	62,	63,	64,	64,
	65,	66,	67,	68,	69,	70,	71,	72,
	73,	74,	75,	76,	77,	78,	79,	79,
	80,	81,	82,	83,	84,	85,	86,	87,
	88,	89,	90,	91,	92,	93,	94,	95,
	96,	97,	98,	99,	100,	101,	102,	103,
	104,	105,	106,	107,	108,	109,	110,	111,
	112,	113,	114,	115,	116,	117,	118,	119,
	120,	121,	122,	123,	124,	125,	126,	127};

static int
search(
	int		val,
	short		*table,
	int		size)
{
	int		i;

	for (i = 0; i < size; i++) {
		if (val <= *table++)
			return (i);
	}
	return (size);
}

/*
 * linear2alaw() - Convert a 16-bit linear PCM value to 8-bit A-law
 *
 * linear2alaw() accepts an 16-bit integer and encodes it as A-law data.
 *
 *		Linear Input Code	Compressed Code
 *	------------------------	---------------
 *	0000000wxyza			000wxyz
 *	0000001wxyza			001wxyz
 *	000001wxyzab			010wxyz
 *	00001wxyzabc			011wxyz
 *	0001wxyzabcd			100wxyz
 *	001wxyzabcde			101wxyz
 *	01wxyzabcdef			110wxyz
 *	1wxyzabcdefg			111wxyz
 *
 * For further information see John C. Bellamy's Digital Telephony, 1982,
 * John Wiley & Sons, pps 98-111 and 472-476.
 */
unsigned char
linear2alaw(
	int		pcm_val)	/* 2's complement (16-bit range) */
{
	int		mask;
	int		seg;
	unsigned char	aval;

	if (pcm_val >= 0) {
		mask = 0xD5;		/* sign (7th) bit = 1 */
	} else {
		mask = 0x55;		/* sign bit = 0 */
		pcm_val = -pcm_val - 8;
	}

	/* Convert the scaled magnitude to segment number. */
	seg = search(pcm_val, seg_end, 8);

	/* Combine the sign, segment, and quantization bits. */

	if (seg >= 8)		/* out of range, return maximum value. */
		return (0x7F ^ mask);
	else {
		aval = seg << SEG_SHIFT;
		if (seg < 2)
			aval |= (pcm_val >> 4) & QUANT_MASK;
		else
			aval |= (pcm_val >> (seg + 3)) & QUANT_MASK;
		return (aval ^ mask);
	}
}

/*
 * alaw2linear() - Convert an A-law value to 16-bit linear PCM
 *
 */
int
alaw2linear(
	unsigned char	a_val)
{
	int		t;
	int		seg;

	a_val ^= 0x55;

	t = (a_val & QUANT_MASK) << 4;
	seg = ((unsigned)a_val & SEG_MASK) >> SEG_SHIFT;
	switch (seg) {
	case 0:
		t += 8;
		break;
	case 1:
		t += 0x108;
		break;
	default:
		t += 0x108;
		t <<= seg - 1;
	}
	return ((a_val & SIGN_BIT) ? t : -t);
}

#define	BIAS		(0x84)		/* Bias for linear code. */

/*
 * linear2ulaw() - Convert a linear PCM value to u-law
 *
 * In order to simplify the encoding process, the original linear magnitude
 * is biased by adding 33 which shifts the encoding range from (0 - 8158) to
 * (33 - 8191). The result can be seen in the following encoding table:
 *
 *	Biased Linear Input Code	Compressed Code
 *	------------------------	---------------
 *	00000001wxyza			000wxyz
 *	0000001wxyzab			001wxyz
 *	000001wxyzabc			010wxyz
 *	00001wxyzabcd			011wxyz
 *	0001wxyzabcde			100wxyz
 *	001wxyzabcdef			101wxyz
 *	01wxyzabcdefg			110wxyz
 *	1wxyzabcdefgh			111wxyz
 *
 * Each biased linear code has a leading 1 which identifies the segment
 * number. The value of the segment number is equal to 7 minus the number
 * of leading 0's. The quantization interval is directly available as the
 * four bits wxyz.  * The trailing bits (a - h) are ignored.
 *
 * Ordinarily the complement of the resulting code word is used for
 * transmission, and so the code word is complemented before it is returned.
 *
 * For further information see John C. Bellamy's Digital Telephony, 1982,
 * John Wiley & Sons, pps 98-111 and 472-476.
 */
static inline unsigned char
linear2ulaw(short pcm_val)	/* 2's complement (16-bit range) */
{
    short		mask;
    short		seg;
    unsigned char	uval;
    
    /* Get the sign and the magnitude of the value. */
    pcm_val = pcm_val >> 2;
    if (pcm_val < 0) {
        pcm_val = -pcm_val;
        mask = 0x7F;
    } else {
        mask = 0xFF;
    }
    if ( pcm_val > CLIP ) pcm_val = CLIP;		/* clip the magnitude */
    pcm_val += (BIAS >> 2);
    
    /* Convert the scaled magnitude to segment number. */
    seg = search(pcm_val, seg_uend, 8);
    
    /*
     * Combine the sign, segment, quantization bits;
     * and complement the code word.
     */
    if (seg >= 8)		/* out of range, return maximum value. */
        return (unsigned char) (0x7F ^ mask);
    else {
        uval = (unsigned char) (seg << 4) | ((pcm_val >> (seg + 1)) & 0xF);
        return (uval ^ mask);
    }
}

/*
 * ulaw2linear() - Convert a u-law value to 16-bit linear PCM
 *
 * First, a biased linear code is derived from the code word. An unbiased
 * output can then be obtained by subtracting 33 from the biased code.
 *
 * Note that this function expects to be passed the complement of the
 * original code word. This is in keeping with ISDN conventions.
 */
int
ulaw2linear(
	unsigned char	u_val)
{
	int		t;

	/* Complement to obtain normal u-law value. */
	u_val = ~u_val;

	/*
	 * Extract and bias the quantization bits. Then
	 * shift up by the segment number and subtract out the bias.
	 */
	t = ((u_val & QUANT_MASK) << 3) + BIAS;
	t <<= ((unsigned)u_val & SEG_MASK) >> SEG_SHIFT;

	return ((u_val & SIGN_BIT) ? (BIAS - t) : (t - BIAS));
}

/* A-law to u-law conversion */
unsigned char
alaw2ulaw(
	unsigned char	aval)
{
	aval &= 0xff;
	return ((aval & 0x80) ? (0xFF ^ _a2u[aval ^ 0xD5]) :
	    (0x7F ^ _a2u[aval ^ 0x55]));
}

/* u-law to A-law conversion */
unsigned char
ulaw2alaw(
	unsigned char	uval)
{
	uval &= 0xff;
	return ((uval & 0x80) ? (0xD5 ^ (_u2a[0xFF ^ uval] - 1)) :
	    (0x55 ^ (_u2a[0x7F ^ uval] - 1)));
}

//*******************************************
/*
*    IMA ADPCM
*/
#define CLAMP_TO_SHORT(value) \
if (value > 32767) \
    value = 32767; \
else if (value < -32768) \
    value = -32768; \

/* Intel ADPCM step variation table */
static int indexTable[16] = {
    -1, -1, -1, -1, 2, 4, 6, 8,
    -1, -1, -1, -1, 2, 4, 6, 8,
};

static int stepsizeTable[89] = {
    7, 8, 9, 10, 11, 12, 13, 14, 16, 17,
    19, 21, 23, 25, 28, 31, 34, 37, 41, 45,
    50, 55, 60, 66, 73, 80, 88, 97, 107, 118,
    130, 143, 157, 173, 190, 209, 230, 253, 279, 307,
    337, 371, 408, 449, 494, 544, 598, 658, 724, 796,
    876, 963, 1060, 1166, 1282, 1411, 1552, 1707, 1878, 2066,
    2272, 2499, 2749, 3024, 3327, 3660, 4026, 4428, 4871, 5358,
    5894, 6484, 7132, 7845, 8630, 9493, 10442, 11487, 12635, 13899,
    15289, 16818, 18500, 20350, 22385, 24623, 27086, 29794, 32767
};

typedef struct adpcm_state{
	int index;
	int valprev;
}_ADPCM,*pADPCM;

void
adpcm_coder(short *indata, unsigned char *outdata, int len, struct adpcm_state *state)
{
    short *inp;			/* Input buffer pointer */
    signed char *outp;		/* output buffer pointer */
    int val;			/* Current input sample value */
    int sign;			/* Current adpcm sign bit */
    int delta;			/* Current adpcm output value */
    int diff;			/* Difference between val and valprev */
    int step;			/* Stepsize */
    int valpred;		/* Predicted output value */
    int vpdiff;			/* Current change to valpred */
    int index;			/* Current step change index */
    int outputbuffer;		/* place to keep previous 4-bit value */
    int bufferstep;		/* toggle between outputbuffer/output */

    outp = (signed char *)outdata;
    inp = indata;

    valpred = state->valprev;
    index = state->index;
    step = stepsizeTable[index];
    
    bufferstep = 1;
    

    for ( ; len > 0 ; len-- ) {
	val = *inp++;

	/* Step 1 - compute difference with previous value */
	diff = val - valpred;
	sign = (diff < 0) ? 8 : 0;
	if ( sign ) diff = (-diff);

	/* Step 2 - Divide and clamp */
	/* Note:
	** This code *approximately* computes:
	**    delta = diff*4/step;
	**    vpdiff = (delta+0.5)*step/4;
	** but in shift step bits are dropped. The net result of this is
	** that even if you have fast mul/div hardware you cannot put it to
	** good use since the fixup would be too expensive.
	*/
	delta = 0;
	vpdiff = (step >> 3);
	
	if ( diff >= step ) {
	    delta = 4;
	    diff -= step;
	    vpdiff += step;
	}
	step >>= 1;
	if ( diff >= step  ) {
	    delta |= 2;
	    diff -= step;
	    vpdiff += step;
	}
	step >>= 1;
	if ( diff >= step ) {
	    delta |= 1;
	    vpdiff += step;
	}

	/* Step 3 - Update previous value */
	if ( sign )
	  valpred -= vpdiff;
	else
	  valpred += vpdiff;

	/* Step 4 - Clamp previous value to 16 bits */
	if ( valpred > 32767 )
	  valpred = 32767;
	else if ( valpred < -32768 )
	  valpred = -32768;

	/* Step 5 - Assemble value, update index and step values */
	delta |= sign;
	
	index += indexTable[delta];
	if ( index < 0 ) index = 0;
	if ( index > 88 ) index = 88;
	step = stepsizeTable[index];

	/* Step 6 - Output value */
	if ( bufferstep ) {
	    outputbuffer = (delta & 0x0f) ; 
	} else {
	    *outp++ = ((delta << 4) & 0xf0) | outputbuffer;
	}
	bufferstep = !bufferstep;
    }

    /* Output last step, if needed */
    if ( !bufferstep )
      *outp++ = outputbuffer;
    
    state->valprev = valpred;
    state->index = index;
}

void
adpcm_decoder(char *indata, short *outdata,int len, struct adpcm_state* state)    
{
    signed char *inp;		/* Input buffer pointer */
    short *outp;		/* output buffer pointer */
    int sign;			/* Current adpcm sign bit */