当时写到这里只是为了markdown的live preview，不过现在看了还是有点伤心。花了半个多月的心血，做的基本让自己满意了，但是其实day 5做出来的东西交上去基本上就是满分了……悲剧……

看着这个log，觉得UI真是个害人的东西。

放出来吧，以此祭奠这个project。

代码在这里：svn

C++大作业2

题目

设计实现一个WIN32（或LINUX）平台下的控制台窗口界面的录音和放音软件。要求在录音时，能够检测录音时的无声状态，并可以方便地插入不同的“过滤器”来处理声音片段，如检测输出音量大小、过滤掉无声段、 过滤掉噪音段等等。要求可以存取多种语音格式的WINDOWS WAVE文件。录音和放音过程可以随时中止。放音的播放列表可以实时编辑。能显示录音和放音的状态信息。

过程

day 1

• searched for cross platform audio lib and got PortAudio, seemed very good
• installed mingw and msys, worked well
• compiled portaudio with ease, in wmme, not direct sound
• tests works well
• but how do i compile with a source file and a lib?
• tough, not working
• mingw-gcc test.c libportaudio.a -lwinmm, worked!
• looked through the c++ wrapper, couldn't be compiled yet

day 2

• started my own wrapper
• rewrote the sine sample to y desired c++ form
• implementing the pa++ to make it work
• finished needed parts for the sine test
• cannot compile, investigating, compiler's message is really confusing
• debugging...program crashes when i tries to start a stream
• still debugging.....
• sweet! finally it worked! how beautiful sine wave sounded!
• refactoring
• wanted to make callback a class, stuck
• at last, have to use an adapter like official c++ wrapper
• oh wait, why bother the adapter class? just put the callback class into userData!
• moving prototype code in hpp to cpp....i hate headers.
• checked in the project to my google code thinxer-codestubs (seems that hg suits my need better, anyway, i love svn)
• refactoring again, removing StreamCallback
• link error.....oh shit
• got it, poor, forgot to add classname when defining CallbackStream's virtual functions
• made sine work after refactored

day 3

• got a small recorder class! works!
• starting a simple wave format implemetation

day 5

• adding a override function to logger, stuck, strange
• at last, wave read works! hooray!
• and wave record works very easily

day 6

• thinking about how to implement a stream-like io interface for record/playback, this would be essential for filters.

day 7 (Sep 7th)

• implemented a BinaryBuffer and StreamFilter
• working on the callback stream to work with the StreamFilter
• working on FilteredCallbackStream
• got that i don't need two adapters...filters can do everything
• but i need two formats, one for input and one for output!
• stuck stuck stuck!

day 8

• ah, sine generator works! but my binarybuffer's effiency is too low!

day 9

• implemented a very efficient binary buffer, i love it.

day 10

• stuck! the stream parameters are determined at startup but wave needs to change them!
• and the filters cannot got how much buffer left for play
• so improve the StreamFilter.
• i'd like not to change the pa++ lib, since it works well
• oh shit....sample format are easy to convert, but samplerate is not so easy
• so i need to know the output parameter from the wave file
• i need an init and got the output format, then init the stream
• so filters cannot be changed online (when pause), but it's ok :)
• so to use a filtered stream i need the following steps: 1, register filters 2, init the filters and got the output parameters 3, init the stream 4, start it and no input/output paramters change during this stream 5, no change to the pa++ core lib and an agent will do all the things

day 11

• at last, an agent was added and wave play works. but the code looked not so tidy..

day 12

• trying to implement curses....
• seems very complicated at first glance..
• got a tutorial, and not so hard, now menus works
• c++ wrap wrap wrap!!

day 13

• still struggling on the UI

day 14

• many minor improvements, trying to write a High Pass but without success

day 15

• implemented a-law and u-law encoding
• UI and UI....how to set filter's parameters?
• got some simple inferfaces for the parameters and output info

day 16

• still pains on ui, getting it to work though...
• started playlist design.

day 17

• debugging
• implemented some better UI

day 18

• still hard working, implemented a CustomFilterMenu

day 19

• looking into a dll way of plug-in filters
• thinking about whether i should merge the dll part into main, considering this would make the main cannot cross platform
• put the dll into a small demo

day 20

• writing ppt and doc