本文整理汇总了C++中AudioDecoder::seek方法的典型用法代码示例。如果您正苦于以下问题：C++ AudioDecoder::seek方法的具体用法？C++ AudioDecoder::seek怎么用？C++ AudioDecoder::seek使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类AudioDecoder的用法示例。
在下文中一共展示了AudioDecoder::seek方法的2个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: createWaveform
//.........这里部分代码省略.........
continue;
}
}
}
else
{
dataRead = defaultDataLen;
tmpExceedData = audioDataOffset - defaultDataLen;
}
if (dataRead > 0)
{
quint32 i = 0;
// calculate the RMS value (peak) for this data block
double rmsLeft = 0;
double rmsRight = 0;
bool done = false;
while (!done)
{
if (left == true)
{
qint32 sampleVal = getSample(audioData, &i, sampleSize);
rmsLeft += (sampleVal * sampleVal);
}
if (channels == 2)
{
if (right == true)
{
qint32 sampleVal = getSample(audioData, &i, sampleSize);
rmsRight += (sampleVal * sampleVal);
}
else
getSample(audioData, &i, sampleSize); // got to read it anyway and discard data
}
if (i >= dataRead / sampleSize)
done = true;
}
quint32 divisor = (dataRead / sampleSize) / channels;
if (left == true)
rmsLeft = sqrt(rmsLeft / divisor);
if (right == true)
rmsRight = sqrt(rmsRight / divisor);
// 3- Draw the actual waveform
unsigned short lineHeightLeft = 0, lineHeightRight = 0;
if (left == true)
lineHeightLeft = (76 * rmsLeft) / maxValue;
if (right == true)
lineHeightRight = (76 * rmsRight) / maxValue;
if (left == true && right == true)
{
if (lineHeightLeft > 1)
p.drawLine(xpos, 19 - (lineHeightLeft / 2), xpos, 19 + (lineHeightLeft / 2));
else
p.drawLine(xpos, 19, xpos + 1, 19);
if (lineHeightRight > 1)
p.drawLine(xpos, 51 - (lineHeightRight / 2), xpos, 51 + (lineHeightRight / 2));
else
p.drawLine(xpos, 51, xpos + 1, 51);
}
else
{
unsigned short lineHeight = 0;
if (left == true)
lineHeight = lineHeightLeft;
else
lineHeight = lineHeightRight;
if (lineHeight > 1)
p.drawLine(xpos, 38 - (lineHeight / 2), xpos, 38 + (lineHeight / 2));
else
p.drawLine(xpos, 38, xpos + 1, 38);
//qDebug() << "Data read: " << dataRead << ", rms: " << rms << ", line height: " << lineHeight << ", xpos = " << xpos;
}
xpos++;
if (tmpExceedData > 0)
{
//qDebug() << "Exceed data found: " << tmpExceedData;
memmove(audioData, audioData + defaultDataLen, tmpExceedData);
audioDataOffset = tmpExceedData;
}
else
audioDataOffset = 0;
}
}
//qDebug() << "Iterations done: " << xpos;
ad->seek(0);
}
else // no preview selected. Delete pixmap
{
delete m_preview;
m_preview = NULL;
}
update();
}示例2: rotateBufferThread
void AudioPlayer::rotateBufferThread(int offsetFrame)
{
char* tmpBuffer = nullptr;
AudioDecoder* decoder = AudioDecoderManager::createDecoder(_audioCache->_fileFullPath.c_str());
do
{
BREAK_IF(decoder == nullptr || !decoder->open(_audioCache->_fileFullPath.c_str()));
uint32_t framesRead = 0;
const uint32_t framesToRead = _audioCache->_queBufferFrames;
const uint32_t bufferSize = framesToRead * decoder->getBytesPerFrame();
tmpBuffer = (char*)malloc(bufferSize);
memset(tmpBuffer, 0, bufferSize);
if (offsetFrame != 0) {
decoder->seek(offsetFrame);
}
ALint sourceState;
ALint bufferProcessed = 0;
bool needToExitThread = false;
while (!_isDestroyed) {
alGetSourcei(_alSource, AL_SOURCE_STATE, &sourceState);
if (sourceState == AL_PLAYING) {
alGetSourcei(_alSource, AL_BUFFERS_PROCESSED, &bufferProcessed);
while (bufferProcessed > 0) {
bufferProcessed--;
if (_timeDirty) {
_timeDirty = false;
offsetFrame = _currTime * decoder->getSampleRate();
decoder->seek(offsetFrame);
}
else {
_currTime += QUEUEBUFFER_TIME_STEP;
if (_currTime > _audioCache->_duration) {
if (_loop) {
_currTime = 0.0f;
} else {
_currTime = _audioCache->_duration;
}
}
}
framesRead = decoder->readFixedFrames(framesToRead, tmpBuffer);
if (framesRead == 0) {
if (_loop) {
decoder->seek(0);
framesRead = decoder->readFixedFrames(framesToRead, tmpBuffer);
} else {
needToExitThread = true;
break;
}
}
ALuint bid;
alSourceUnqueueBuffers(_alSource, 1, &bid);
alBufferData(bid, _audioCache->_format, tmpBuffer, framesRead * decoder->getBytesPerFrame(), decoder->getSampleRate());
alSourceQueueBuffers(_alSource, 1, &bid);
}
}
std::unique_lock<std::mutex> lk(_sleepMutex);
if (_isDestroyed || needToExitThread) {
break;
}
_sleepCondition.wait_for(lk,std::chrono::milliseconds(75));
}
} while(false);
ALOGV("Exit rotate buffer thread ...");
if (decoder != nullptr)
{
decoder->close();
}
AudioDecoderManager::destroyDecoder(decoder);
free(tmpBuffer);
_isRotateThreadExited = true;
ALOGV("%s exited.\n", __FUNCTION__);
}