//==============================================================================
bool AudioThumbnail::setDataSource (LevelDataSource* newSource)
{
jassert (MessageManager::getInstance()->currentThreadHasLockedMessageManager());
numSamplesFinished = 0;
if (cache.loadThumb (*this, newSource->hashCode) && isFullyLoaded())
{
source = newSource; // (make sure this isn't done before loadThumb is called)
source->lengthInSamples = totalSamples;
source->sampleRate = sampleRate;
source->numChannels = (unsigned int) numChannels;
source->numSamplesFinished = numSamplesFinished;
}
else
{
source = newSource; // (make sure this isn't done before loadThumb is called)
const ScopedLock sl (lock);
source->initialise (numSamplesFinished);
totalSamples = source->lengthInSamples;
sampleRate = source->sampleRate;
numChannels = (int32) source->numChannels;
createChannels (1 + (int) (totalSamples / samplesPerThumbSample));
}
return sampleRate > 0 && totalSamples > 0;
}
int useTimeSlice()
{
if (isFullyLoaded())
{
if (reader != nullptr && source != nullptr)
releaseResources();
return -1;
}
bool justFinished = false;
{
const ScopedLock sl (readerLock);
createReader();
if (reader != nullptr)
{
if (! readNextBlock())
return 0;
justFinished = true;
}
}
if (justFinished)
owner.cache.storeThumb (owner, hashCode);
return timeBeforeDeletingReader;
}
bool readNextBlock()
{
jassert (reader != nullptr);
if (! isFullyLoaded())
{
const int numToDo = (int) jmin (256 * (int64) owner.samplesPerThumbSample, lengthInSamples - numSamplesFinished);
if (numToDo > 0)
{
int64 startSample = numSamplesFinished;
const int firstThumbIndex = sampleToThumbSample (startSample);
const int lastThumbIndex = sampleToThumbSample (startSample + numToDo);
const int numThumbSamps = lastThumbIndex - firstThumbIndex;
HeapBlock<MinMaxValue> levelData ((size_t) numThumbSamps * numChannels);
HeapBlock<MinMaxValue*> levels (numChannels);
for (int i = 0; i < (int) numChannels; ++i)
levels[i] = levelData + i * numThumbSamps;
HeapBlock<Range<float> > levelsRead (numChannels);
for (int i = 0; i < numThumbSamps; ++i)
{
reader->readMaxLevels ((firstThumbIndex + i) * owner.samplesPerThumbSample,
owner.samplesPerThumbSample, levelsRead, (int) numChannels);
for (int j = 0; j < (int) numChannels; ++j)
levels[j][i].setFloat (levelsRead[j]);
}
{
const ScopedUnlock su (readerLock);
owner.setLevels (levels, firstThumbIndex, (int) numChannels, numThumbSamps);
}
numSamplesFinished += numToDo;
lastReaderUseTime = Time::getMillisecondCounter();
}
}
return isFullyLoaded();
}
bool readNextBlock()
{
jassert (reader != nullptr);
if (! isFullyLoaded())
{
const int numToDo = (int) jmin (256 * (int64) owner.samplesPerThumbSample, lengthInSamples - numSamplesFinished);
if (numToDo > 0)
{
int64 startSample = numSamplesFinished;
const int firstThumbIndex = sampleToThumbSample (startSample);
const int lastThumbIndex = sampleToThumbSample (startSample + numToDo);
const int numThumbSamps = lastThumbIndex - firstThumbIndex;
HeapBlock<MinMaxValue> levelData ((size_t) numThumbSamps * 2);
MinMaxValue* levels[2] = { levelData, levelData + numThumbSamps };
for (int i = 0; i < numThumbSamps; ++i)
{
float lowestLeft, highestLeft, lowestRight, highestRight;
reader->readMaxLevels ((firstThumbIndex + i) * owner.samplesPerThumbSample, owner.samplesPerThumbSample,
lowestLeft, highestLeft, lowestRight, highestRight);
levels[0][i].setFloat (lowestLeft, highestLeft);
levels[1][i].setFloat (lowestRight, highestRight);
}
{
const ScopedUnlock su (readerLock);
owner.setLevels (levels, firstThumbIndex, 2, numThumbSamps);
}
numSamplesFinished += numToDo;
lastReaderUseTime = Time::getMillisecondCounter();
}
}
return isFullyLoaded();
}
void initialise (int64 samplesFinished)
{
const ScopedLock sl (readerLock);
numSamplesFinished = samplesFinished;
createReader();
if (reader != nullptr)
{
lengthInSamples = reader->lengthInSamples;
numChannels = reader->numChannels;
sampleRate = reader->sampleRate;
if (lengthInSamples <= 0 || isFullyLoaded())
reader = nullptr;
else
owner.cache.getTimeSliceThread().addTimeSliceClient (this);
}
}
int useTimeSlice() override
{
if (isFullyLoaded())
{
if (reader != nullptr && source != nullptr)
{
if (Time::getMillisecondCounter() > lastReaderUseTime + timeBeforeDeletingReader)
releaseResources();
else
return 200;
}
return -1;
}
bool justFinished = false;
{
const ScopedLock sl (readerLock);
createReader();
if (reader != nullptr)
{
if (! readNextBlock())
return 0;
justFinished = true;
}
}
if (justFinished)
owner.cache.storeThumb (owner, hashCode);
return 200;
}
