av_headset_kalimba.c

csr 蓝牙芯片 无线蓝牙耳机的嵌入式程序

/****************************************************************************
Copyright (C) Cambridge Silicon Radio Ltd. 2004

FILE NAME
    av_headset_kalimiba.c

DESCRIPTION

NOTES

*/


/****************************************************************************
    Header files
*/
#include "av_headset_private.h"
#include "av_headset_kalimba.h"

#include <file.h>
#include <kalimba.h>
#include <kalimba_standard_messages.h>
#include <panic.h>
#include <pcm.h>
#include <stdlib.h>
#include <string.h>


static uint32 GetSampleRateValue(vm_pcm_rate rate)
{
    switch (rate)
    {
    case VM_PCM_RATE_8K:     return 8000;
    case VM_PCM_RATE_11K025: return 11025;
    case VM_PCM_RATE_16K:    return 16000;
    case VM_PCM_RATE_22K05:  return 22050;
    case VM_PCM_RATE_24K:    return 24000;
    case VM_PCM_RATE_32K:    return 32000;
    case VM_PCM_RATE_44K1:   return 44100;
    case VM_PCM_RATE_48K:    return 48000;
    }    
    return 48000;
}


/* Configure the physical codec depending on the AV codec params negotiated */
static void configureCodec(avTaskData *theAvApp)
{
	uint32 sampleRate = GetSampleRateValue(theAvApp->rate); 
   
    /* Disconnect anything already connected to PCM slots 0 and 1 */
    StreamDisconnect(StreamPcmSource(0), StreamPcmSink(0));
    StreamDisconnect(StreamPcmSource(1), StreamPcmSink(1));

	/*
		Set both ports to external to allow reassigning of internal DACs below.
		(A DAC can only be routed to one port at a time!)
	*/
	(void) PanicFalse(PcmRoute(0, VM_PCM_NONE, PCM_NO_SYNC));
	(void) PanicFalse(PcmRoute(1, VM_PCM_NONE, PCM_NO_SYNC));

	/* Is it mono playback? */
	if (theAvApp->channel_mode == a2dp_mono)
	{
		/* Mono - Set both DACs to play the output of port 0. */
		(void) PanicFalse(PcmRateAndRoute(0, PCM_NO_SYNC, sampleRate, 8000, VM_PCM_INTERNAL_A_AND_B));
	}
	else
	{
		/*
			Stereo - Configure port 0 and 1 to be left and right channels
			and synchronise buffer offsets for stereo playback.
		*/
		(void) PanicFalse(PcmRateAndRoute(0, PCM_NO_SYNC, sampleRate, 8000, VM_PCM_INTERNAL_A));
		(void) PanicFalse(PcmRateAndRoute(1, 0, sampleRate, 8000, VM_PCM_INTERNAL_B));
	}
}


/*************************************************************************
NAME
     avHeadsetStartKalimba

DESCRIPTION
     Initialise Kalimba and routing for SBC encoding

RETURNS

*/
void avHeadsetStartKalimba(avTaskData *theAvApp)
{
    /* Configure the DACs for the codec configuration */
    configureCodec(theAvApp);
    
    /* Start decode */
	A2dpAudioCodecEnable(theAvApp->a2dp, theAvApp->media_sink);

    /* Is it mono playback? */
    if (theAvApp->channel_mode == a2dp_mono)
    {
        /* Plug port 0 into both DACs */
        (void) StreamConnect(StreamKalimbaSource(0),StreamPcmSink(0));
    }
    else
    {
        /* Plug port 0 into Left DAC */
        (void)StreamConnect(StreamKalimbaSource(0),StreamPcmSink(0));

        /* Plug port 1 into Right DAC */
        (void)StreamConnect(StreamKalimbaSource(1),StreamPcmSink(1));
    }

	/* Start decode */
    (void) PanicFalse(KalimbaSendMessage(KALIMBA_MSG_GO,0,0,0,0));
}


/*************************************************************************
NAME
     avHeadsetStopKalimba

DESCRIPTION
    Stop Kalimba and power it down.

RETURNS

*/
void avHeadsetStopKalimba(const avTaskData *theAvApp)
{
   /* Stop decode */
    A2dpAudioCodecDisable(theAvApp->a2dp, theAvApp->media_sink);
}