64 lines
1.5 KiB
C++
64 lines
1.5 KiB
C++
#include "GaplessRingBuffer.h"
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#include <bfc/platform/types.h>
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#include <bfc/error.h>
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#include <algorithm>
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GaplessRingBuffer::GaplessRingBuffer()
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{
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pregapBytes = 0;
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frameBytes = 0;
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postgapBytes = 0;
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currentPregapBytes = 0;
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}
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GaplessRingBuffer::~GaplessRingBuffer()
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{
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}
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int GaplessRingBuffer::Initialize(size_t samples, size_t bps, size_t channels, size_t pregap, size_t postgap)
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{
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this->frameBytes = channels * bps / 8;
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this->currentPregapBytes = this->pregapBytes = pregap * frameBytes;
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this->postgapBytes = postgap * frameBytes;
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ring_buffer.reserve(samples * frameBytes + pregapBytes);
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return NErr_Success;
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}
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bool GaplessRingBuffer::Empty() const
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{
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return (ring_buffer.size() <= pregapBytes);
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}
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size_t GaplessRingBuffer::Read(void *destination, size_t destination_bytes)
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{
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// make sure we've filled enough of the buffer to satisfy the postgap
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if (Empty()) {
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return 0;
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}
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// don't read into postgap area
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size_t remaining = ring_buffer.size() - postgapBytes;
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destination_bytes = min(remaining, destination_bytes);
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return ring_buffer.read(destination, destination_bytes);
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}
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size_t GaplessRingBuffer::Write(const void *input, size_t input_bytes)
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{
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// cut pregap if necessary
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if (currentPregapBytes) {
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size_t cut = min(input_bytes, currentPregapBytes);
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currentPregapBytes -= cut;
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input_bytes -= cut;
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input = (const uint8_t *)input + cut;
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}
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return ring_buffer.write(input, input_bytes);
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}
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void GaplessRingBuffer::Reset()
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{
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currentPregapBytes = pregapBytes;
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ring_buffer.clear();
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} |