daniel
172d5902c8
InsertMedia-driven placement reading the bank panel selection, undo-wrapped. Native length by default; conform-to-tempo is an explicit second action, never a silent stretch. Pure mode-bit logic (insert_plan) unit-tested.
50 lines
1.7 KiB
C++
50 lines
1.7 KiB
C++
// insert_plan.cpp — see insert_plan.h. Pure InsertMedia mode-bit arithmetic.
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#include "insert_plan.h"
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namespace reasampler {
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namespace {
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// Base target bits (mode&3). We use only 0 (current track) and 1 (new track).
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constexpr int kBaseCurrentTrack = 0; // add to current track
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constexpr int kBaseNewTrack = 1; // add new track
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// Tempo-conform bits, verbatim from the header doc-comment.
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constexpr int kMatchTempo1x = 8; // &8: try to match tempo 1x
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constexpr int kMatchTempoHalf = 16; // &16: try to match tempo 0.5x
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constexpr int kMatchTempoDbl = 32; // &32: try to match tempo 2x
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constexpr int kDontPreservePitch = 64; // &64: don't preserve pitch when matching tempo
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} // namespace
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int computeInsertMode(const InsertOptions& opts) {
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int mode = opts.target == InsertTarget::NewTrack ? kBaseNewTrack
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: kBaseCurrentTrack;
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switch (opts.conform) {
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case TempoConform::None:
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// No tempo bits: native length, no stretch. (Also never &4.)
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return mode;
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case TempoConform::Ratio1x:
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mode |= kMatchTempo1x;
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break;
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case TempoConform::RatioHalf:
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mode |= kMatchTempoHalf;
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break;
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case TempoConform::RatioDouble:
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mode |= kMatchTempoDbl;
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break;
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}
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// Tempo bits are set (conform != None). Add the pitch-shift bit only when the
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// caller asked NOT to preserve pitch. When conform == None we already returned
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// above, so this can never fire without a tempo bit present.
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if (!opts.preservePitch)
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mode |= kDontPreservePitch;
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return mode;
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}
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} // namespace reasampler
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