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699:20210921在win10安裝MSYS2來使用GNU軟體開發工具建立portaudio程式庫並用C編寫wav檔播放程式<br><table width=800 border=8><tr><td bgcolor=cyan><ol>
<li>wav音訊檔1：<a href="uploads/NHU05018165.wav">uploads/NHU05018165.wav</a>
<li>wav音訊檔2：<a href="uploads/cicada.wav">uploads/cicada.wav</a>

<li>各式音訊檔：<a href="http://mauvecloud.net/sounds/index.html">http://mauvecloud.net/sounds/index.html</a>

<li>C程式碼檔1：<a href="uploads/playwav.c">uploads/playwav.c</a>

<li>教學說明文件：<a href="uploads/20210919講WIN10編譯並建立portaudio程式庫.odt">
20210919講WIN10編譯並建立portaudio程式庫.odt </a>
</ol>

<li>執行結果：
<pre>
$ ./playwav
The input file size is 4562656 bytes.
check1 : h.ChunkID=RIFF OK!
check2 : h.FormatTag=WAVE OK!
check3 : h.SubChunk1ID=fmt  OK!
check4 : h.AudioFormat=1 for PCM encoding OK!
        NumChannels=2
        SampleRate=44100
        ByteRate=176400
        BlockAlign=4
        BitsPerSample=16
check5 : h.NumChannels*h.SampleRate*h.BitsPerSample/8 == h.ByteRate =176400 OK!
check6 : h.NumChannels*h.BitsPerSample/8 == h.BlockAlign=4  OK!
check7 : BitsPerSample is 16  OK!

Current infile pos=44(After read wav header)
        SubChunkNID=bext SubChunkNSize=642
        SubChunkNID=pad  SubChunkNSize=16
        SubChunkNID=data SubChunkNSize=4561888
check8 : audio time < 360 second OK!
check9 : Header size (768)==(768) FileSize-AudioDataSize OK!

Current infile pos=768 (Before read audio data)

Current infile pos=4562656 (After read audio data)

file size=4562656, wav data size = 4561888 ,audio time=25
Load NHU05018165.wav OK

</pre></table><br> select id,article_id,topic,text from lt_articles_text where article_id =699; ok.
update lt_articles set num_reads=num_reads +1 where id=699; ok.