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#pragma once
#include <AK/RefCounted.h>
#include <AK/ByteBuffer.h>
#include <AK/Types.h>
#include <AK/Vector.h>
#include <LibC/SharedBuffer.h>
// A single sample in an audio buffer.
// Values are floating point, and should range from -1.0 to +1.0
struct ASample {
ASample()
: left(0)
, right(0)
{}
// For mono
ASample(float left)
: left(left)
, right(left)
{}
// For stereo
ASample(float left, float right)
: left(left)
, right(right)
{}
void clip()
{
if (left > 1)
left = 1;
else if (left < -1)
left = -1;
if (right > 1)
right = 1;
else if (right < -1)
right = -1;
}
void scale(int percent)
{
float pct = (float)percent / 100.0;
left *= pct;
right *= pct;
}
ASample& operator+=(const ASample& other)
{
left += other.left;
right += other.right;
return *this;
}
float left;
float right;
};
// A buffer of audio samples, normalized to 44100hz.
class ABuffer : public RefCounted<ABuffer> {
public:
static RefPtr<ABuffer> from_pcm_data(ByteBuffer& data, int num_channels, int bits_per_sample, int source_rate);
static NonnullRefPtr<ABuffer> create_with_samples(Vector<ASample>&& samples)
{
return adopt(*new ABuffer(move(samples)));
}
static NonnullRefPtr<ABuffer> create_with_shared_buffer(NonnullRefPtr<SharedBuffer>&& buffer)
{
return adopt(*new ABuffer(move(buffer)));
}
const ASample* samples() const { return (const ASample*)data(); }
int sample_count() const { return m_buffer->size() / (int)sizeof(ASample); }
const void* data() const { return m_buffer->data(); }
int size_in_bytes() const { return m_buffer->size(); }
int shared_buffer_id() const { return m_buffer->shared_buffer_id(); }
SharedBuffer& shared_buffer() { return *m_buffer; }
private:
explicit ABuffer(Vector<ASample>&& samples)
: m_buffer(*SharedBuffer::create_with_size(samples.size() * sizeof(ASample)))
{
memcpy(m_buffer->data(), samples.data(), samples.size() * sizeof(ASample));
}
explicit ABuffer(NonnullRefPtr<SharedBuffer>&& buffer)
: m_buffer(move(buffer))
{
}
NonnullRefPtr<SharedBuffer> m_buffer;
int m_sample_count { 0 };
};
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