aud_input_stream.h

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/*******************************************************************************
* Filename:
* ---------
*  aud_input_stream.h
*
* Project:
* --------
*   MAUI
*
* Description:
* ------------
*   audio input stream functions
*
* Author:
* -------
*  Tim Chen
*
*==============================================================================
*           HISTORY
* Below this line, this part is controlled by PVCS VM. DO NOT MODIFY!! 
 *------------------------------------------------------------------------------
 * $Log$
 *
 *------------------------------------------------------------------------------
* Upper this line, this part is controlled by PVCS VM. DO NOT MODIFY!! 
*==============================================================================
*******************************************************************************/
#ifndef __AUDIO_INPUT_STREAM_H__
#define __AUDIO_INPUT_STREAM_H__

#include "fat_fs.h"

#define AUDIO_INPUT_STREAM_BUFFER_SIZE (4*1024)

typedef struct
{
    kal_uint8 buf[AUDIO_INPUT_STREAM_BUFFER_SIZE + 1];  /* one byte reserved for tail reference to a valid address when it's full */
    kal_uint8 *ptr;
    kal_uint8 *tail;
    kal_uint32 buf_size;
    kal_uint32 skip;
    kal_uint32 total_load;
    kal_uint32 free_bitrate;                            /* bps */
    FS_HANDLE file;
    kal_uint8 *mem_src;                                 /* when file is null, the input soruce is from memory so mem_src must be set */
    kal_uint32 mem_src_size;
}
audio_input_stream_struct;

extern kal_uint8 aud_get_bits(kal_uint8 *buff, kal_uint32 *pbitcount, kal_uint32 bitlen);

extern audio_input_stream_struct *audio_file_input_stream_alloc(FS_HANDLE file);

extern audio_input_stream_struct *audio_byte_input_stream_alloc(kal_uint8 *mem_src, kal_uint32 mem_src_size);

extern void audio_input_stream_free(audio_input_stream_struct *input_stream);

extern void audio_input_stream_init(
                audio_input_stream_struct *input_stream,
                FS_HANDLE file,
                kal_uint8 *mem_src,
                kal_uint32 mem_src_size);

extern void audio_input_stream_seek(audio_input_stream_struct *input_stream, kal_int32 offset);

extern kal_int32 audio_input_stream_get_data_size(audio_input_stream_struct *input_stream);

extern kal_int32 audio_input_stream_read(audio_input_stream_struct *input_stream, kal_int32 size);

#endif /* __AUDIO_INPUT_STREAM_H__ */