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  • TMS320DM642学习----第六篇(CCS中.dat文件类型详解)

    1、如下为.dat文件中文件头的基本格式:

    MagicNumber Format StartingAddress PageNum Length [NewFormat]

    下面是分别的解释:

    MagicNumber:1651.

    Format:a number from 1 to 4, indicating the format of the samples in the file. This number represents a data format:

    • (1) - hexadecimal,
    • (2) - integer
    • (3) - long
    • (4) - float
    • (9) - Use new scheme 

    StartingAddress:starting address of the block that was saved.

    PageNum:page number the block was taken from.

    Length:number of samples in the block.

    NewFormat:Format (9); the new scheme. This is optional when usign the legacy formats 1 - 4

    如下例子中的数据:

    1 1651 2 8cc0 0 1a70c
    2 79
    3 74
    4 74
    5 67
    6 ...
    7 ...

    第一行的数据为:1651 2 8cc0 0 1a70c

    1651标志着这是TI的.dat文件的格式。

    2表示了这个文件中的数据是整数格式的,比如第二行的数据79是interger的格式。

    8cc0表示这段数据Load Memory到CCS软件的过程中,是加载到0x8cc0对应的地址上的。

    0表示这段数据将加载到page0的位置上。

    1a70c表示这段数据的总长度为0x1a70c(Hex) = 108300(Decimal)

    2、创建图像对应的.dat文件:

    如下的图片,转换为190*190大小的图片,并生成对应的.dat文件.

     Code(文件名称:_dat_create.py):

     1 import cv2
     2 import glob
     3 Path = glob.glob('*.jpg')
     4 count = 0
     5 for Pic in Path:
     6         I = cv2.imread(Pic)
     7         res = cv2.resize(I,(190,190),interpolation=cv2.INTER_CUBIC)
     8         Name = "Test" + str(count)
     9         cv2.imwrite(Name + ".png",res)
    10         fid = open(Name + ".dat",'w')
    11         fid.write('1651 2 8cc0 0 1a70c'+'
    ')
    12         width,height = res.shape[:2]
    13         for channel in range(3):
    14                 for row in range(height):
    15                         for col in range(width):
    16                                 fid.write(str(res[row][col][channel])+'
    ')
    17         count += 1

    将上述代码以及要处理的图片拷贝到同一个目录下,双击运行python脚本文件即可生成:

    我们可以通过修改代码中的190*190的图像尺寸来生成不同的图像数据,并生成对应的.dat文件。

    3、创建音频对应的.dat文件:

    如下链接中的单音音源sin.wav,生成对应的.dat文件.

    https://files.cnblogs.com/files/uestc-mm/sin.7z

    Code(文件名Audio2Dat.py):

     1 from scipy.io.wavfile import write, read
     2 import numpy as np
     3 import math
     4 import glob
     5 import sys
     6 import os
     7 
     8 INT16_FAC = (2**15)-1
     9 INT32_FAC = (2**31)-1
    10 INT64_FAC = (2**63)-1
    11 norm_fact = {'int16':INT16_FAC, 'int32':INT32_FAC, 'int64':INT64_FAC,'float32':1.0,'float64':1.0}
    12 
    13 def wavread(filename):
    14     """
    15     Read a sound file and convert it to a normalized floating point array
    16     filename: name of file to read
    17     returns fs: sampling rate of file, x: floating point array
    18     """
    19     if (os.path.isfile(filename) == False):                  # raise error if wrong input file
    20             print("Input file does not exist. Make sure you computed the analysis/synthesis")
    21 
    22     fs, x = read(filename)
    23 
    24     if (len(x.shape) !=1):                                   # raise error if more than one channel
    25             raise ValueError("Audio file should be mono")
    26 
    27     if (fs !=44100):                                         # raise error if more than one channel
    28             raise ValueError("Sampling rate of input sound should be 44100")
    29 
    30     #scale down and convert audio into floating point number in range of -1 to 1
    31     x = np.float32(x)/norm_fact[x.dtype.name]
    32     return fs, x
    33 
    34 path = glob.glob('*.wav')
    35 count = 1
    36 for p in path:
    37     fs, dat = wavread(str(p))
    38 
    39     fid = open(str(count)+'.dat','w')
    40     # flie·Magic=1651 X=9 data·StartAddress=0x80000000 X=0 data·Number(Hex)=0x7a120 X=5
    41     fid.write('1651 9 80000000 0 7a120 5'+'
    ')
    42     for i in dat:
    43             fid.write(str(i)+'
    ')
    44     fid.close()
    45     count += 1

    将上述代码以及要处理的图片拷贝到同一个目录下,双击运行python脚本文件即可生成.dat文件:

    结果如下:

    1 1651 9 80000000 0 7a120 5
    2 0.0
    3 0.05011866
    4 0.10004042
    5 0.14956915
    6 0.19851027
    7 ...
    8 ...

    参考内容:

    Reference001:来自TI员工的回答,https://e2e.ti.com/support/tools/ccs/f/81/t/789759?tisearch=e2e-sitesearch&keymatch=%20user:332444

    Reference002:所有代码,图片-音频打包下载(TI_dat_create.7z),https://files.cnblogs.com/files/uestc-mm/TI_dat_create.7z

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  • 原文地址:https://www.cnblogs.com/uestc-mm/p/10674332.html
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