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ump-utils: fix MIDI 2.0 pitch bend and mask program number

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Fix spa_ump_to_midi() MIDI 2.0 pitch bend (0xE0) to extract both LSB
and MSB from the 32-bit value in word 2, giving full 14-bit resolution.
Previously the LSB came from a reserved field and was always zero.

Mask the program number with 0x7f for consistency with bank byte
masking.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Wim Taymans 2026-05-22 17:13:41 +02:00
parent 26635056a4
commit 4fbe2ef421
2 changed files with 25 additions and 1 deletions
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7
spa/include/spa/control/ump-utils.h
View file

@ -118,7 +118,7 @@ SPA_API_CONTROL_UMP_UTILS int spa_ump_to_midi(const uint32_t **ump, size_t *ump_
}
else if (*state == 2) {
midi[size++] = status;
midi[size++] = (u[1] >> 24);
midi[size++] = (u[1] >> 24) & 0x7f;
*state = 0;
}
break;
@ -126,6 +126,11 @@ SPA_API_CONTROL_UMP_UTILS int spa_ump_to_midi(const uint32_t **ump, size_t *ump_
midi[size++] = status;
midi[size++] = (u[1] >> 25);
break;
case 0xe0:
midi[size++] = status;
midi[size++] = (u[1] >> 18) & 0x7f;
midi[size++] = (u[1] >> 25);
break;
default:
midi[size++] = status;
midi[size++] = (u[0] >> 8) & 0x7f;

19
spa/tests/test-ump-utils.c
View file

@ -571,6 +571,24 @@ static void test_ump_to_midi2_note_on(void)
spa_assert(midi[2] == 0x7e);
}
static void test_ump_to_midi2_pitch_bend(void)
{
/* MIDI 2.0 pitch bend: type 4, status E, channel 0
* 32-bit value 0x80A00000 → 14-bit = 0x80A00000 >> 18 = 0x2028
* LSB = 0x28, MSB = 0x40 */
uint32_t ump[] = { 0x40E00000, 0x80A00000 };
const uint32_t *p = ump;
size_t ump_size = sizeof(ump);
uint8_t midi[8];
uint64_t state = 0;
int size = spa_ump_to_midi(&p, &ump_size, midi, sizeof(midi), &state);
spa_assert(size == 3);
spa_assert(midi[0] == 0xe0);
spa_assert(midi[1] == 0x28);
spa_assert(midi[2] == 0x40);
}
static void test_ump_to_midi2_program_change_with_bank(void)
{
/* MIDI 2.0 program change with bank valid, bank bytes have bit 7 set
@ -646,6 +664,7 @@ int main(void)
test_ump_from_midi_sysex_split_with_f7();
test_ump_to_midi2_channel_pressure();
test_ump_to_midi2_note_on();
test_ump_to_midi2_pitch_bend();
test_ump_to_midi2_program_change_with_bank();
test_ump_to_midi2_program_change_no_bank();