110 lines
5.0 KiB
C++
110 lines
5.0 KiB
C++
// instrument_drop — pure implementation. See instrument_drop.h.
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// NO REAPER / SWELL / VST3 SDK / vendor. Reuses sample_map's ComponentState serializer and
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// the SDK-free UID macros (vst/reasampler_uid.h).
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#include "instrument_drop.h"
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#include <cstdio>
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#include "vst/reasampler_uid.h" // REASAMPLER_ACTIVE_UID_* — the FROZEN, channel-selected class UID
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#include "vst/sample_map.h" // ComponentState + serializeComponentState (the SHARED writer)
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namespace reasampler {
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namespace {
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// Little-endian appenders — the .vstpreset container stores its integers little-endian on
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// disk (public.sdk vstpresetfile.cpp swaps only on big-endian hosts).
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void appendU32LE(std::vector<std::uint8_t>& out, std::uint32_t v) {
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out.push_back(static_cast<std::uint8_t>(v & 0xFF));
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out.push_back(static_cast<std::uint8_t>((v >> 8) & 0xFF));
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out.push_back(static_cast<std::uint8_t>((v >> 16) & 0xFF));
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out.push_back(static_cast<std::uint8_t>((v >> 24) & 0xFF));
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}
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void appendU64LE(std::vector<std::uint8_t>& out, std::uint64_t v) {
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for (int i = 0; i < 8; ++i)
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out.push_back(static_cast<std::uint8_t>((v >> (8 * i)) & 0xFF));
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}
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void appendFourCC(std::vector<std::uint8_t>& out, const char id[4]) {
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out.insert(out.end(), id, id + 4);
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}
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} // namespace
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std::string vstClassIdHex() {
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// FUID::toString reduces to the four INLINE_UID words as "%08X" in order on BOTH byte
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// layouts (see header contract), so rendering the macros directly is the platform-stable
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// derivation of the string the .vstpreset header must carry.
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char buf[33];
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std::snprintf(buf, sizeof(buf), "%08X%08X%08X%08X",
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static_cast<unsigned>(REASAMPLER_ACTIVE_UID_1),
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static_cast<unsigned>(REASAMPLER_ACTIVE_UID_2),
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static_cast<unsigned>(REASAMPLER_ACTIVE_UID_3),
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static_cast<unsigned>(REASAMPLER_ACTIVE_UID_4));
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return std::string(buf, 32);
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}
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std::vector<std::uint8_t> buildVstPresetBytes(
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const std::string& classIdHex32, const std::vector<std::uint8_t>& componentState) {
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std::vector<std::uint8_t> out;
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if (classIdHex32.size() != 32) return out; // contract violation -> empty, never throws
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// Header (48 bytes): 'VST3' + int32 version + 32-char class ID + int64 list offset.
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constexpr std::uint64_t kHeaderSize = 4 + 4 + 32 + 8;
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const std::uint64_t compSize = componentState.size();
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const std::uint64_t listOffset = kHeaderSize + compSize;
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out.reserve(static_cast<std::size_t>(listOffset) + 4 + 4 + (4 + 8 + 8));
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appendFourCC(out, "VST3");
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appendU32LE(out, 1); // kFormatVersion
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out.insert(out.end(), classIdHex32.begin(), classIdHex32.end());
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appendU64LE(out, listOffset);
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// Data area: the one 'Comp' chunk's bytes, at offset kHeaderSize.
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out.insert(out.end(), componentState.begin(), componentState.end());
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// Chunk list: 'List' + entry count + one entry {'Comp', offset, size}.
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appendFourCC(out, "List");
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appendU32LE(out, 1);
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appendFourCC(out, "Comp");
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appendU64LE(out, kHeaderSize);
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appendU64LE(out, compSize);
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return out;
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}
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std::vector<std::uint8_t> instrumentDropStateBytes(const std::string& sampleId) {
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// The ONE fact the drop carries: this capture is the instance's selection. Everything
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// else stays at the fresh-instance defaults (no zones, implicit channel mode, generation
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// 0) — the same ComponentState a browser click would produce. The implicit mode means
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// the GA auto-default will follow the loaded capture's channel count on first reload.
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// serializeComponentState is the instrument's own writer (the single source of truth for
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// the byte layout), so this is NOT a parallel encoder — it IS the instrument's encoder.
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ComponentState cs;
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cs.selectionId = sampleId;
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return serializeComponentState(cs);
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}
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std::vector<std::uint8_t> buildInstrumentDropPreset(const std::string& sampleId) {
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return buildVstPresetBytes(vstClassIdHex(), instrumentDropStateBytes(sampleId));
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}
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bool infoNamesFxHotspot(const std::string& info) {
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// See the header contract. Prefix rule (S-GA-DropFX): "fx_" names the FX-chain /
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// floating-FX windows; "tcp.fx" / "mcp.fx" prefixes name the TCP/MCP FX button and its
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// sibling FX sub-elements (fxbyp/fxparm/fxlist...), tolerant of the SDK-documented "may
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// append additional information". Bare "tcp"/"mcp" and non-FX sub-elements ("tcp.mute",
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// "tcp.vol") must NOT trigger an instrument drop.
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//
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// EXCLUDE the embed-strip sub-element ("tcp.fxembed" / "mcp.fxembed"): that is the
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// surface where a ReaSampler 9000 embed strip draws inside the TCP/MCP. Dropping a card
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// there must NOT add a SECOND instance — the surface is the existing instance's own UI,
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// not an FX-chain drop target. It starts with "tcp.fx" so it must be explicitly excluded.
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auto startsWith = [&info](const char* p) { return info.rfind(p, 0) == 0; };
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if (startsWith("tcp.fxembed") || startsWith("mcp.fxembed")) return false;
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return startsWith("fx_") || startsWith("tcp.fx") || startsWith("mcp.fx");
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}
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} // namespace reasampler
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