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General Tech Bugs & Fixes 2 years ago
Posted on 28 Aug 2022, this text provides information on Bugs & Fixes related to General Tech. Please note that while accuracy is prioritized, the data presented might not be entirely correct or up-to-date. This information is offered for general knowledge and informational purposes only, and should not be considered as a substitute for professional advice.
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This is my struct
/* wave data block header */ typedef struct wavehdr_tag { LPSTR lpData; /* pointer to locked data buffer */ DWORD dwBufferLength; /* length of data buffer */ DWORD dwBytesRecorded; /* used for input only */ DWORD_PTR dwUser; /* for client's use */ DWORD dwFlags; /* assorted flags (see defines) */ DWORD dwLoops; /* loop control counter */ struct wavehdr_tag FAR *lpNext; /* reserved for driver */ DWORD_PTR reserved; /* reserved for driver */ } WAVEHDR, *PWAVEHDR, NEAR *NPWAVEHDR, FAR *LPWAVEHDR;
I have this variable WAVEHDR waveHeader;
WAVEHDR waveHeader;
I record 10 secs from microphone and waveHeader->lpData has my raw recorded data, and waveHeader->dwBytesRecorded is the raw data's length
waveHeader->lpData
waveHeader->dwBytesRecorded
Now I want to calculate the volume in each second to say which second has highest volume and which one has the lowest.
I know I should sum the absolute values and divide by the number of samples
I used sum += abs(waveHeader->lpData[i]); for i from 0 to length of one secs data, but it doesn't give me a good result
sum += abs(waveHeader->lpData[i]);
it always gives me the same result for each second, but I am silent in some seconds and speak in some...
I read I have to add samples, not bytes How should I convert waveHeader->lpData[i] to samples?
waveHeader->lpData[i]
//len = length of one secs data (waveHeader->dwBytesRecorded/10) for (int i=0; i<len; i++) { sum += abs(waveHeader->lpData[i]); }
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