audio_comm.h

来自「sample on embedded linux」· C头文件 代码 · 共 73 行

/******************************************************************************

  Copyright (C), 2001-2011, Hisilicon Tech. Co., Ltd.

 ******************************************************************************
  File Name     : audio_comm.h
  Version       : Initial Draft
  Author        : Hisilicon multimedia software group
  Created       : 2006/12/19
  Description   : 
  History       :
  1.Date        : 2006/12/19
    Author      : Z44949
    Modification: Created file

******************************************************************************/
#ifndef __AUDIO_COMM_H__
#define __AUDIO_COMM_H__

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include "hi_common_api.h"

/* Define the sample rate which AD supported */
#define  SET_TLV_SAMPLERATE 0xaF01
#define  SET_8K_SAMPLERATE  0
#define  SET_32K_SAMPLERATE 3
#define  SET_48K_SAMPLERATE 5   

#define AAC_CHANNEL_SUPPORT 2                /* The channles supported by AAC */
#define AAC_MAX_BANDWIDTH   20000            /* The max bandwidth             */

/* Set the AD's sample rate */
static HI_VOID SetADSampleRate(HI_U32 sample)
{	
    HI_S32 fd;
    HI_U32 tmp;

    /* We use TLV320 as audio AD */
    fd = open("/dev/misc/tlv320",O_NONBLOCK);
	if (fd < 0) 
	{
    	perror("tlv320");
    	exit(1);
	}

    tmp = sample;
	ioctl(fd, SET_TLV_SAMPLERATE,&tmp);
	
	close(fd);
}

/* Set the AI's sample rate */
static HI_S32 SetAiSampleRate(AI_CHN ai_chnid, AUDIO_SAMPLE_RATE_E enSample)
{
    AUDIO_CH_ATTR_S strAttr;
    HI_S32          s32Ret;

    s32Ret = HI_AENC_GetAIAttr(ai_chnid, &strAttr);
    ASSERT_RETURN((HI_SUCCESS == s32Ret), s32Ret);
    
    strAttr.enSampleRate = enSample;
    s32Ret = HI_AENC_SetAIAttr(ai_chnid, &strAttr);
    ASSERT_RETURN((HI_SUCCESS == s32Ret), s32Ret);

    return HI_SUCCESS;
}

#endif