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ALSA: ump: Transmit RPN/NRPN message at each MSB/LSB data reception
The UMP 1.1 spec says that an RPN/NRPN should be sent when one of the following occurs: * a CC 38 is received * a subsequent CC 6 is received * a CC 98, 99, 100, and 101 is received, indicating the last RPN/NRPN message has ended and a new one has started That said, we should send a partial data even if it's not fully filled. Let's change the UMP conversion helper code to follow that rule. Link: https://patch.msgid.link/20240731130528.12600-2-tiwai@suse.de Signed-off-by: Takashi Iwai <tiwai@suse.de>
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@ -13,6 +13,7 @@ struct ump_cvt_to_ump_bank {
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unsigned char cc_nrpn_msb, cc_nrpn_lsb;
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unsigned char cc_data_msb, cc_data_lsb;
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unsigned char cc_bank_msb, cc_bank_lsb;
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bool cc_data_msb_set, cc_data_lsb_set;
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};
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/* context for converting from MIDI1 byte stream to UMP packet */
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@ -287,25 +287,37 @@ static int cvt_legacy_system_to_ump(struct ump_cvt_to_ump *cvt,
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return 4;
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}
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static void fill_rpn(struct ump_cvt_to_ump_bank *cc,
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union snd_ump_midi2_msg *midi2)
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static int fill_rpn(struct ump_cvt_to_ump_bank *cc,
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union snd_ump_midi2_msg *midi2,
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bool flush)
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{
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if (!(cc->cc_data_lsb_set || cc->cc_data_msb_set))
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return 0; // skip
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/* when not flushing, wait for complete data set */
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if (!flush && (!cc->cc_data_lsb_set || !cc->cc_data_msb_set))
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return 0; // skip
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if (cc->rpn_set) {
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midi2->rpn.status = UMP_MSG_STATUS_RPN;
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midi2->rpn.bank = cc->cc_rpn_msb;
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midi2->rpn.index = cc->cc_rpn_lsb;
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cc->rpn_set = 0;
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cc->cc_rpn_msb = cc->cc_rpn_lsb = 0;
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} else {
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} else if (cc->nrpn_set) {
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midi2->rpn.status = UMP_MSG_STATUS_NRPN;
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midi2->rpn.bank = cc->cc_nrpn_msb;
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midi2->rpn.index = cc->cc_nrpn_lsb;
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cc->nrpn_set = 0;
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cc->cc_nrpn_msb = cc->cc_nrpn_lsb = 0;
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} else {
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return 0; // skip
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}
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midi2->rpn.data = upscale_14_to_32bit((cc->cc_data_msb << 7) |
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cc->cc_data_lsb);
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cc->rpn_set = 0;
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cc->nrpn_set = 0;
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cc->cc_rpn_msb = cc->cc_rpn_lsb = 0;
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cc->cc_data_msb = cc->cc_data_lsb = 0;
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cc->cc_data_msb_set = cc->cc_data_lsb_set = 0;
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return 1;
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}
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/* convert to a MIDI 1.0 Channel Voice message */
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@ -318,6 +330,7 @@ static int cvt_legacy_cmd_to_ump(struct ump_cvt_to_ump *cvt,
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struct ump_cvt_to_ump_bank *cc;
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union snd_ump_midi2_msg *midi2 = (union snd_ump_midi2_msg *)data;
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unsigned char status, channel;
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int ret;
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BUILD_BUG_ON(sizeof(union snd_ump_midi1_msg) != 4);
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BUILD_BUG_ON(sizeof(union snd_ump_midi2_msg) != 8);
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@ -358,24 +371,29 @@ static int cvt_legacy_cmd_to_ump(struct ump_cvt_to_ump *cvt,
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case UMP_MSG_STATUS_CC:
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switch (buf[1]) {
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case UMP_CC_RPN_MSB:
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ret = fill_rpn(cc, midi2, true);
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cc->rpn_set = 1;
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cc->cc_rpn_msb = buf[2];
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return 0; // skip
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return ret;
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case UMP_CC_RPN_LSB:
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ret = fill_rpn(cc, midi2, true);
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cc->rpn_set = 1;
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cc->cc_rpn_lsb = buf[2];
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return 0; // skip
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return ret;
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case UMP_CC_NRPN_MSB:
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ret = fill_rpn(cc, midi2, true);
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cc->nrpn_set = 1;
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cc->cc_nrpn_msb = buf[2];
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return 0; // skip
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return ret;
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case UMP_CC_NRPN_LSB:
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ret = fill_rpn(cc, midi2, true);
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cc->nrpn_set = 1;
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cc->cc_nrpn_lsb = buf[2];
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return 0; // skip
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return ret;
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case UMP_CC_DATA:
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cc->cc_data_msb_set = 1;
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cc->cc_data_msb = buf[2];
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return 0; // skip
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return fill_rpn(cc, midi2, false);
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case UMP_CC_BANK_SELECT:
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cc->bank_set = 1;
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cc->cc_bank_msb = buf[2];
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@ -385,12 +403,9 @@ static int cvt_legacy_cmd_to_ump(struct ump_cvt_to_ump *cvt,
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cc->cc_bank_lsb = buf[2];
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return 0; // skip
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case UMP_CC_DATA_LSB:
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cc->cc_data_lsb_set = 1;
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cc->cc_data_lsb = buf[2];
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if (cc->rpn_set || cc->nrpn_set)
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fill_rpn(cc, midi2);
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else
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return 0; // skip
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break;
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return fill_rpn(cc, midi2, false);
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default:
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midi2->cc.index = buf[1];
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midi2->cc.data = upscale_7_to_32bit(buf[2]);
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