Initial check-in of OpenShot Library

src/AudioBufferSource.cpp

@@ -0,0 +1,135 @@
+#include "../include/AudioBufferSource.h"
+
+using namespace std;
+using namespace openshot;
+
+// Default constructor
+AudioBufferSource::AudioBufferSource(int samples, int channels)
+		: position(0), start(0), repeat(false)
+{
+	// Create new buffer
+	buffer = new AudioSampleBuffer(channels, samples);
+	buffer->clear();
+
+//	AudioFormatManager formatManager;
+//	formatManager.registerBasicFormats();
+//
+//	File file ("/home/jonathan/Aptana Studio Workspace/OpenShotLibrary/src/examples/piano.wav");
+//	AudioFormatReader* reader = formatManager.createReaderFor (file);
+//	if (reader != 0)
+//	{
+//		buffer = new AudioSampleBuffer(reader->numChannels, reader->lengthInSamples);
+//		buffer->readFromAudioReader(reader, 0, reader->lengthInSamples, 0, true, true);
+//		float* firstChannelSamples = buffer->getSampleData(0, 0);
+//	}
+}
+
+// Destructor
+AudioBufferSource::~AudioBufferSource()
+{
+	// Clear and delete the buffer
+	buffer->clear();
+	delete buffer;
+	buffer = NULL;
+};
+
+// Get the next block of audio samples
+void AudioBufferSource::getNextAudioBlock (const AudioSourceChannelInfo& info)
+{
+	int buffer_samples = buffer->getNumSamples();
+	int buffer_channels = buffer->getNumChannels();
+
+	if (info.numSamples > 0) {
+		int start = position;
+		int number_to_copy = 0;
+
+		// Determine how many samples to copy
+		if (start + info.numSamples <= buffer_samples)
+		{
+			// copy the full amount requested
+			number_to_copy = info.numSamples;
+		}
+		else if (start > buffer_samples)
+		{
+			// copy nothing
+			number_to_copy = 0;
+		}
+		else if (buffer_samples - start > 0)
+		{
+			// only copy what is left in the buffer
+			number_to_copy = buffer_samples - start;
+		}
+		else
+		{
+			// copy nothing
+			number_to_copy = 0;
+		}
+
+		// Determine if any samples need to be copied
+		if (number_to_copy > 0)
+		{
+			// Loop through each channel and copy some samples
+			for (int channel = 0; channel < buffer_channels; channel++)
+				info.buffer->copyFrom(channel, info.startSample, *buffer, channel, start, number_to_copy);
+
+			// Update the position of this audio source
+			position += number_to_copy;
+		}
+
+	}
+
+}
+
+// Prepare to play this audio source
+void AudioBufferSource::prepareToPlay(int, double) { };
+
+// Release all resources
+void AudioBufferSource::releaseResources()
+{
+	// Clear the buffer
+	buffer->clear();
+};
+
+// Set the next read position of this source
+void AudioBufferSource::setNextReadPosition (int newPosition)
+{
+	// set position (if the new position is in range)
+	if (newPosition > 0 && newPosition < buffer->getNumSamples())
+		position = newPosition;
+};
+
+// Get the next read position of this source
+int AudioBufferSource::getNextReadPosition() const
+{
+	// return the next read position
+	return position;
+};
+
+// Get the total length (in samples) of this audio source
+int AudioBufferSource::getTotalLength() const
+{
+	// Get the length
+	return buffer->getNumSamples();
+};
+
+// Determines if this audio source should repeat when it reaches the end
+bool AudioBufferSource::isLooping() const
+{
+	// return if this source is looping
+	return repeat;
+};
+
+// Set if this audio source should repeat when it reaches the end
+void AudioBufferSource::setLooping (bool shouldLoop)
+{
+	// Set the repeat flag
+	repeat = shouldLoop;
+};
+
+// Add audio samples to a specific channel
+void AudioBufferSource::AddAudio(int destChannel, int destStartSample, const float* source, int numSamples, float gainToApplyToSource = 1.0f)
+{
+	// Add samples to frame's audio buffer
+	buffer->addFrom(destChannel, destStartSample, source, numSamples, gainToApplyToSource);
+}
+