115 lines
2.9 KiB
C++
115 lines
2.9 KiB
C++
#pragma once
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#include <AK/ByteBuffer.h>
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#include <AK/Types.h>
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#include <AK/Vector.h>
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#include <AK/SharedBuffer.h>
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// A single sample in an audio buffer.
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// Values are floating point, and should range from -1.0 to +1.0
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struct ASample {
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ASample()
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: left(0)
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, right(0)
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{
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}
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// For mono
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ASample(float left)
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: left(left)
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, right(left)
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{
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}
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// For stereo
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ASample(float left, float right)
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: left(left)
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, right(right)
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{
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}
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void clip()
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{
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if (left > 1)
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left = 1;
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else if (left < -1)
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left = -1;
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if (right > 1)
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right = 1;
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else if (right < -1)
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right = -1;
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}
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void scale(int percent)
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{
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float pct = (float)percent / 100.0;
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left *= pct;
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right *= pct;
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}
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ASample& operator+=(const ASample& other)
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{
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left += other.left;
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right += other.right;
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return *this;
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}
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float left;
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float right;
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};
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// Small helper to resample from one playback rate to another
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// This isn't really "smart", in that we just insert (or drop) samples.
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// Should do better...
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class AResampleHelper {
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public:
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AResampleHelper(float source, float target);
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void process_sample(float sample_l, float sample_r);
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bool read_sample(float& next_l, float& next_r);
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private:
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const float m_ratio;
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float m_current_ratio { 0 };
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float m_last_sample_l { 0 };
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float m_last_sample_r { 0 };
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};
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// A buffer of audio samples, normalized to 44100hz.
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class ABuffer : public RefCounted<ABuffer> {
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public:
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static RefPtr<ABuffer> from_pcm_data(ByteBuffer& data, AResampleHelper& resampler, int num_channels, int bits_per_sample);
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static NonnullRefPtr<ABuffer> create_with_samples(Vector<ASample>&& samples)
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{
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return adopt(*new ABuffer(move(samples)));
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}
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static NonnullRefPtr<ABuffer> create_with_shared_buffer(NonnullRefPtr<SharedBuffer>&& buffer, int sample_count)
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{
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return adopt(*new ABuffer(move(buffer), sample_count));
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}
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const ASample* samples() const { return (const ASample*)data(); }
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int sample_count() const { return m_sample_count; }
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const void* data() const { return m_buffer->data(); }
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int size_in_bytes() const { return m_sample_count * (int)sizeof(ASample); }
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int shared_buffer_id() const { return m_buffer->shared_buffer_id(); }
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SharedBuffer& shared_buffer() { return *m_buffer; }
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private:
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explicit ABuffer(Vector<ASample>&& samples)
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: m_buffer(*SharedBuffer::create_with_size(samples.size() * sizeof(ASample))),
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m_sample_count(samples.size())
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{
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memcpy(m_buffer->data(), samples.data(), samples.size() * sizeof(ASample));
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}
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explicit ABuffer(NonnullRefPtr<SharedBuffer>&& buffer, int sample_count)
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: m_buffer(move(buffer)),
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m_sample_count(sample_count)
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{
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}
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NonnullRefPtr<SharedBuffer> m_buffer;
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const int m_sample_count;
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};
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