mp3eutil.c

Intel提供的在Sitsang等嵌入式开发平台上使用Linux操作系统

/******************************************************************************
//               INTEL CORPORATION PROPRIETARY INFORMATION
//  This software is supplied under the terms of a license agreement or
//  nondisclosure agreement with Intel Corporation and may not be copied
//  or disclosed except in accordance with the terms of that agreement.
//        Copyright (C) 2003 Intel Corporation. All Rights Reserved.
//
//  Description:
//    Intel(R) Integrated Performance Primitives Sample Code MP3 Encoder
// 
//  Function List:
//    encoder_parse_cmdline_mp3()
//    buffer_copy_audio()
//    buffer_set_audio()
//    encoder_flushbitstream_mp3()
******************************************************************************/
#include <malloc.h>
#include <memory.h>
#include "sampmp3.h"
/******************************************************************************
// Name:             buffer_copy_audio
// Description:      copy content of one buffer to another buffer
// Input Arguments : src    - pointer to input buffer.
//                   len    - length for copy.
// Output Arguments: dst    - pointer to output buffer.
// Returns:          N/A
******************************************************************************/
void  buffer_copy_audio(const Ipp32s * src, Ipp32s * dst, int len)
{
    int  i;
    for (i = 0; i < len; i++)	{
        dst[i] = src[i];
	}
    return;
}

/******************************************************************************
// Name:             buffer_set_audio
// Description:      set the content of buffer to be a const.
// Input Arguments : val    - value to set the buffer.
//                   len    - buffer length for set.
// Output Arguments: dst    - pointer to output buffer.
// Returns:	         N/A
******************************************************************************/
void buffer_set_audio(Ipp32s val, Ipp32s * dst, int len)
{
    int  i;
    for ( i = 0; i < len; i ++ ) {
        dst[i] = val;
	}
    return;
}


/******************************************************************************
// Name:                free_align_mem_mp3
// Description:         Free aligned memory blocks
//
// Input Arguments:
//      buf_addr_ptr    Pointer to the void pointer to the allocated space
//                      with alignment off_set.
//
// Output Arguments:
//      buf_addr_ptr    Pointer to a NULL void pointer
//
// Returns:
//     SAMPLE_STATUS_NOERR  If succeeds
******************************************************************************/
sample_status   free_align_mem_mp3(void **buf_addr_ptr) 
{
    Ipp8u   off_set = 0;
    Ipp8u   *addr = NULL;

    addr  = (Ipp8u*)(*buf_addr_ptr);
    off_set = *(addr - 1);
    addr -= off_set;
    free((void*)addr);

    *buf_addr_ptr = NULL;

    return SAMPLE_STATUS_NOERR;
}


/******************************************************************************
// Name:                alloc_align_mem_mp3
// Description:         Allocate aligned memory blocks
//
// Input Arguments:
//      buf_addr_ptr    Pointer to the void pointer to the allocated space
//      size            Number of bytes to be allocated
//      alignstatus     Number of bytes to be aligned, e.g., 2 for half
//                      word aligned, 4 for word aligned, 8 for double word
//                      aligned
//
// Output Arguments:
//      buf_addr_ptr    Pointer to the void pointer to the allocated space
//
// Returns:
//     SAMPLE_STATUS_NOERR      If succeeds
//     SAMPLE_STATUS_NOMEM_ERR  If memory allocation fails
******************************************************************************/
sample_status alloc_align_mem_mp3(void **buf_addr_ptr,
                                    int  size,
                                    int  alignstatus)
{
    Ipp8u *addr = NULL;
    Ipp8u tmp = 0;
    
    size  += alignstatus;
    addr  = malloc(size);
    if (!addr) {
        *buf_addr_ptr = NULL;
        return SAMPLE_STATUS_NOMEM_ERR;
    }

    tmp = (Ipp8u)((Ipp32u)(addr) & (alignstatus - 1));
    tmp = (Ipp8u)(alignstatus - tmp);
    addr += tmp;

    *(addr - 1) = tmp;
    *buf_addr_ptr = (void*)addr;
    return SAMPLE_STATUS_NOERR;
}



/******************************************************************************
// Name:             encoder_flushbitstream_mp3
// Description:      flush the encoded data into output buffer.
// Input Arguments : enc_state  - pointer to encode state structure.
// Output Arguments: stream_buf - pointer to output structure.
// Returns:	         N/A
******************************************************************************/
void encoder_flushbitstream_mp3(mp3_enc_state *enc_state, 
                                sample_bitstream *stream_buf) 
{
	int i,j;
	int bytes_per_frame;
	int maindataindex;
	int bytesbuffered;
	int bufferedframeindex;
	int bufferedmaindataindex;
	int bufferedframe_num;

	/*Check if the bits are enough to flush*/
	maindataindex = enc_state->bufferedframe_index - \
        enc_state->bufferedframe_num;
	bufferedframe_num = enc_state->bufferedframe_num;
	if(maindataindex < 0) {
		maindataindex +=9;
	}

	bytesbuffered = enc_state->hdsi_len; 
	for ( i = maindataindex; i < maindataindex + bufferedframe_num; i ++ ) {
		j = i;
		if (i>=9) {
			j-=9;
		}
		bytesbuffered += enc_state->mdframe_buf_len[j];
	}
	bufferedframeindex =  maindataindex;
	bufferedmaindataindex = bufferedframeindex;
	bytes_per_frame = enc_state->frame_len[bufferedframeindex];
	if ( bytesbuffered > bytes_per_frame ) { 
		int len1, len2;
        /* Flush header information and side infomation */
		for ( i = 0; i < enc_state->hdsi_len; i ++ ) {
			*stream_buf->bs_cur_byte ++ = enc_state->hdsi_buf\
                [bufferedframeindex*enc_state->hdsi_len+i];
		}
		len1 = bytes_per_frame - enc_state->hdsi_len;
        /* Flush main data */
		while ( len1 > 0 && bufferedframe_num > 0 ) {
			len2 = IPP_MIN(len1, enc_state->mdframe_buf_len\
                [bufferedmaindataindex]); 
			j = 0;
			for (j = 0; j < len2; i ++, j ++ ) {
				*stream_buf->bs_cur_byte ++ = enc_state->mdframe_buf_ptr\
                    [bufferedmaindataindex][j];
			}
			len1 -= len2;
			enc_state->mdframe_buf_len[bufferedmaindataindex] -= len2;
			enc_state->mdframe_buf_ptr[bufferedmaindataindex] += len2;
			bufferedmaindataindex ++;
			if(bufferedmaindataindex == 9) {
				bufferedmaindataindex =0;
			}
		}		
		bufferedframe_num --;
	}
	enc_state->bufferedframe_num = bufferedframe_num;
	return;
}