[PATCH 1/5] midimap: Handle MIDI running status.

[Akihiro Sagawa]

Wine's midiOutShortMsg() can't handle the MIDI message if the status
byte is omitted. Omitting status byte is valid and called "running
status".

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=53003
Signed-off-by: Akihiro Sagawa 
---
 dlls/midimap/midimap.c | 30 +++++++++++++++++++++++++++---
 1 file changed, 27 insertions(+), 3 deletions(-)

[Andrew Eikum]

Signed-off-by: Andrew Eikum

On Thu, May 26, 2022 at 11:38:43PM +0900, Akihiro Sagawa wrote:
> Wine's midiOutShortMsg() can't handle the MIDI message if the status
> byte is omitted. Omitting status byte is valid and called "running
> status".
>
> Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=53003
> Signed-off-by: Akihiro Sagawa
>
> dlls/midimap/midimap.c | 30 +++++++++++++++++++++++++++---
>  1 file changed, 27 insertions(+), 3 deletions(-)
> diff --git a/dlls/midimap/midimap.c b/dlls/midimap/midimap.c
> index 12555f5309a..e04fe721364 100644
> --- a/dlls/midimap/midimap.c
> +++ b/dlls/midimap/midimap.c
> @@ -101,6 +101,7 @@ typedef	struct tagMIDIMAPDATA
>      struct tagMIDIMAPDATA*	self;
>      MIDIOUTPORT*	ChannelMap[16];
>      MIDIOPENDESC	midiDesc;
> - BYTE		runningStatus;
> WORD		wCbFlags;
>
> } MIDIMAPDATA;
>
> @@ -301,6 +302,7 @@ static DWORD modOpen(DWORD_PTR *lpdwUser, LPMIDIOPENDESC lpDesc, DWORD dwFlags)
>    mom->self = mom;
>    mom->wCbFlags = HIWORD(dwFlags & CALLBACK_TYPEMASK);
>    mom->midiDesc = *lpDesc;
> -
>
> mom->runningStatus = 0;
>
> for (chn = 0; chn < 16; chn++)
> {
>
> @@ -380,6 +382,7 @@ static DWORD modLongData(MIDIMAPDATA* mom, LPMIDIHDR lpMidiHdr, DWORD_PTR dwPara
>        if (ret != MMSYSERR_NOERROR) break;
>    }
>      }
> - mom->runningStatus = 0;
> lpMidiHdr->dwFlags &= ~MHDR_INQUEUE;
> lpMidiHdr->dwFlags |= MHDR_DONE;
> MIDIMAP_NotifyClient(mom, MOM_DONE, (DWORD_PTR)lpMidiHdr, 0L);
>
> @@ -388,16 +391,31 @@ static DWORD modLongData(MIDIMAPDATA* mom, LPMIDIHDR lpMidiHdr, DWORD_PTR dwPara
>
> static DWORD modData(MIDIMAPDATA* mom, DWORD_PTR dwParam)
>  {
> - BYTE	lb = LOBYTE(LOWORD(dwParam));
> - WORD	chn = lb & 0x0F;
> -
>
> BYTE	status = LOBYTE(LOWORD(dwParam));
> -
>
> WORD	chn;
> DWORD	ret = MMSYSERR_NOERROR;
>
> if (MIDIMAP_IsBadData(mom))
> return MMSYSERR_ERROR;
> -
>
> if (status < 0x80)
> -
>
> {
> -
>    if (mom->runningStatus)
> -
>    {
> -
>        status = mom->runningStatus;
> -
>        dwParam = ((LOWORD(dwParam) << 8) | status);
> -
>    }
> -
>    else
> -
>    {
> -
>        FIXME("ooch %Ix\n", dwParam);
> -
>        return MMSYSERR_NOERROR;
> -
>    }
> -
>
> }
> -
>
> chn = status & 0x0F;
> -
>
> if (!mom->ChannelMap[chn]) return MMSYSERR_NOERROR;
> - switch (lb & 0xF0)
> - switch (status & 0xF0)
> {
> case 0x80:
> case 0x90:
>
> @@ -423,6 +441,7 @@ static DWORD modData(MIDIMAPDATA* mom, DWORD_PTR dwParam)
>        }
>        ret = midiOutShortMsg(mom->ChannelMap[chn]->hMidi, dwParam);
>    }
> - mom->runningStatus = status;
> break;
> case 0xF0:
> for (chn = 0; chn < 16; chn++)
>
> @@ -430,6 +449,9 @@ static DWORD modData(MIDIMAPDATA* mom, DWORD_PTR dwParam)
>        if (mom->ChannelMap[chn]->loaded > 0)
>    	ret = midiOutShortMsg(mom->ChannelMap[chn]->hMidi, dwParam);
>    }
> - /* system common message */
> - if (status <= 0xF7)
> -
>    mom->runningStatus = 0;
> break;
>    default:
>  FIXME("ooch %Ix\n", dwParam);
>
> @@ -511,6 +533,8 @@ static	DWORD	modReset(MIDIMAPDATA* mom)
>        if (ret != MMSYSERR_NOERROR) break;
>    }
>      }
> - mom->runningStatus = 0;
> - return ret;
>
> }