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MIDI-safe 7-bit bytes

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md-perf
probonopd 1 week ago
parent a8b6c0e12f
commit d5d8ccd9f8
1 changed files with 37 additions and 32 deletions
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  1. 69
      src/performance_sysex.cpp

69
src/performance_sysex.cpp
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@ -25,6 +25,21 @@
#include "minidexed.h"
#include "mididevice.h"
// Helper functions for 2's complement 14-bit MIDI-safe encoding/decoding
static void encode_midi14_signed_7bit(int value, uint8_t& msb, uint8_t& lsb) {
// Clamp to 14-bit signed range
if (value < -8192) value = -8192;
if (value > 8191) value = 8191;
uint16_t midi14 = (value < 0) ? (0x2000 + value) : value;
midi14 &= 0x3FFF;
msb = (midi14 >> 7) & 0x7F;
lsb = midi14 & 0x7F;
}
static int decode_midi14_signed_7bit(uint8_t msb, uint8_t lsb) {
uint16_t midi14 = ((msb & 0x7F) << 7) | (lsb & 0x7F);
return (midi14 & 0x2000) ? (midi14 - 0x4000) : midi14;
}
LOGMODULE ("PerformanceSysEx");
static constexpr uint8_t SYSEX_START = 0xF0;
@ -166,6 +181,13 @@ void handle_performance_sysex(const uint8_t* pMessage, CMIDIDevice* pDevice, CMi
uint16_t value = 0;
bool ok = false;
ok = perf->GetGlobalParameters(&param, &value, 1);
if (param == CPerformanceConfig::PARAM_DETUNE || param == CPerformanceConfig::PARAM_NOTE_SHIFT) {
uint8_t msb, lsb;
encode_midi14_signed_7bit((int16_t)value, msb, lsb);
uint8_t resp[9] = {SYSEX_START, MANUFACTURER_ID, SET_GLOBAL, (uint8_t)(param >> 8), (uint8_t)(param & 0xFF), msb, lsb, SYSEX_END};
send_sysex_response(resp, 8, pDevice, nCable);
continue;
}
LOGNOTE("SysEx: GET global param 0x%04X -> 0x%04X (%s)", param, value, ok ? "OK" : "FAIL");
// Build and send response (use SET_GLOBAL as response type)
uint8_t resp[8] = {SYSEX_START, MANUFACTURER_ID, SET_GLOBAL, (uint8_t)(param >> 8), (uint8_t)(param & 0xFF), (uint8_t)(value >> 8), (uint8_t)(value & 0xFF), SYSEX_END};
@ -174,6 +196,13 @@ void handle_performance_sysex(const uint8_t* pMessage, CMIDIDevice* pDevice, CMi
uint16_t value = 0;
bool ok = false;
ok = perf->GetTGParameters(&param, &value, 1, tg);
if (param == CPerformanceConfig::PARAM_DETUNE || param == CPerformanceConfig::PARAM_NOTE_SHIFT) {
uint8_t msb, lsb;
encode_midi14_signed_7bit((int16_t)value, msb, lsb);
uint8_t resp[11] = {SYSEX_START, MANUFACTURER_ID, SET_TG, tg, (uint8_t)(param >> 8), (uint8_t)(param & 0xFF), msb, lsb, SYSEX_END};
send_sysex_response(resp, 9, pDevice, nCable);
continue;
}
LOGNOTE("SysEx: GET TG %u param 0x%04X -> 0x%04X (%s)", tg, param, value, ok ? "OK" : "FAIL");
uint8_t resp[10] = {SYSEX_START, MANUFACTURER_ID, SET_TG, tg, (uint8_t)(param >> 8), (uint8_t)(param & 0xFF), (uint8_t)(value >> 8), (uint8_t)(value & 0xFF), SYSEX_END};
send_sysex_response(resp, 9, pDevice, nCable);
@ -183,6 +212,10 @@ void handle_performance_sysex(const uint8_t* pMessage, CMIDIDevice* pDevice, CMi
break;
}
uint16_t value = (pMessage[offset] << 8) | pMessage[offset+1];
if (param == CPerformanceConfig::PARAM_DETUNE || param == CPerformanceConfig::PARAM_NOTE_SHIFT) {
int decoded = decode_midi14_signed_7bit(pMessage[offset], pMessage[offset+1]);
value = (uint16_t)decoded;
}
offset += 2;
bool ok = perf->SetGlobalParameters(&param, &value, 1);
LOGNOTE("SysEx: SET global param 0x%04X = 0x%04X (%s)", param, value, ok ? "OK" : "FAIL");
@ -195,6 +228,10 @@ void handle_performance_sysex(const uint8_t* pMessage, CMIDIDevice* pDevice, CMi
break;
}
uint16_t value = (pMessage[offset] << 8) | pMessage[offset+1];
if (param == CPerformanceConfig::PARAM_DETUNE || param == CPerformanceConfig::PARAM_NOTE_SHIFT) {
int decoded = decode_midi14_signed_7bit(pMessage[offset], pMessage[offset+1]);
value = (uint16_t)decoded;
}
offset += 2;
bool ok = perf->SetTGParameters(&param, &value, 1, tg);
LOGNOTE("SysEx: SET TG %u param 0x%04X = 0x%04X (%s)", tg, param, value, ok ? "OK" : "FAIL");
@ -204,35 +241,3 @@ void handle_performance_sysex(const uint8_t* pMessage, CMIDIDevice* pDevice, CMi
}
}
}
/*
Examples of MiniDexed Performance SysEx messages and expected handler behavior:
1. Get a Global Parameter (e.g., CompressorEnable)
Send: F0 7D 10 00 00 F7
- Logs GET for global param 0x0000, queries value, logs result.
2. Set a Global Parameter (e.g., ReverbEnable ON)
Send: F0 7D 20 00 01 00 01 F7
- Logs SET for global param 0x0001, updates value, logs result.
3. Get All Global Parameters
Send: F0 7D 10 F7
- Logs and dumps all global parameters and values.
4. Get a TG Parameter (e.g., Volume for TG 2)
Send: F0 7D 11 02 00 03 F7
- Logs GET for TG 2 param 0x0003, queries value, logs result.
5. Set a TG Parameter (e.g., Pan for TG 1 to 64)
Send: F0 7D 21 01 00 04 00 40 F7
- Logs SET for TG 1 param 0x0004, updates value, logs result.
6. Get All Parameters for TG 0
Send: F0 7D 11 00 F7
- Logs and dumps all TG 0 parameters and values.
7. Malformed or Unknown Parameter
Send: F0 7D 10 12 34 F7
- Logs GET for global param 0x1234, logs FAIL if unsupported.
*/

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