Pointer to first byte of a vector<float>
The pointer to the audio buffer of the XAUDIO_BUFFER
s开发者_如何学JAVAtructure in XAudio2 is defined as BYTE *pAudioData
. When I was using 16-bit Integer PCM, this is what my program looked like:
void buildWaveBuffer(std::vector<unsigned char> &vec)
{
std::string lineString;
int lineInt;
unsigned char lowByte, highByte;
std::ifstream myfile("sineInt16");
if (myfile.is_open())
{
while(myfile.good())
{
std::getline(myfile,lineString,',');
lineInt = atoi(lineString.c_str());
highByte = (lineInt >> 8) & 0x00FF;
lowByte = lineInt & 0x00FF;
vec.push_back(lowByte);
vec.push_back(highByte);
}
myfile.close();
}
}
"sineInt16"
being a .csv file. Since the vector is organized sequentially in the memory, I would simply do pAudioData = &vec[0]
and it would work. What if I want to change the format of my .csv to float
? How do I give a pointer to the first byte in the vector? Should I use another container like a simple array of chars?
How do I give a pointer to the first byte in the vector?
The exact same way, but I'm not sure it will do what you expect. Read the comments to your question.
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