mirror of
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Updated to reflect current status.
This commit is contained in:
Eric Pouech
Alexandre Julliard
parent
f1e1c3994c
commit
a72a394d04
@ -1,179 +1,185 @@
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This file contains information about the implementation of the multimedia
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This file contains information about the implementation of the
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layer of WINE.
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multimedia layer of WINE.
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The libraries consist of MMSYSTEM.DLL (win16), WINMM.DLL (win32) and some
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The libraries consist of MMSYSTEM.DLL (win16), WINMM.DLL (win32) and
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(abstracted, not Windows compatible) lowlevel drivers. The implementation
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some (abstracted, not Windows compatible) lowlevel drivers. The
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can be found in the multimedia/ subdirectory.
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implementation can be found in the multimedia/ subdirectory.
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The multimedia stuff is split into 3 layers. The lowlevel (device drivers),
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The multimedia stuff is split into 3 layers. The lowlevel (device
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midlevel (MCI commands) and highlevel abstraction layers.
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drivers), midlevel (MCI commands) and highlevel abstraction layers.
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The lowlevel may depend on current hardware and OS services (like OSS).
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The lowlevel may depend on current hardware and OS services (like
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Mid-level and high-level must be written independantly from the hardware and OS
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OSS). Mid-level and high-level must be written independantly from the
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services.
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hardware and OS services.
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1. Lowlevel layers
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1. Lowlevel layers
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==================
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Please note that native low-level drivers are not currently
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supported in WINE, because they either access hardware composants
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or require VxDs to be loaded; WINE does not correctly supports
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those two so far.
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Following lowlevel layers are implemented:
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Following lowlevel layers are implemented:
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1.1 (Waveform) Audio
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1.1 (Waveform) Audio
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--------------------
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The API consists of the waveIn*/waveOut* functions found in
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MMSYSTEM and WINMM call the real lowlevel audiodriver using
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multimedia/mmsystem.c. They call the real lowlevel audiodriver using
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the wodMessage/widMessage function in multimedia/audio.c, which
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the wodMessage/widMessage function in multimedia/audio.c, which handles
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handles the different requests.
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the different requests.
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The lowlevel audio driver is currently only implemented for the
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1.1.1 OSS implementation
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OpenSoundSystem (OSS) as supplied in the Linux and FreeBSD kernels by
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4Front Technologies (http://www.4front-tech.com/). The presence of this
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driver is checked by configure (depends on the <sys/soundcard.h> file).
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The implementation contains all features commonly used, but has several
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The lowlevel audio driver is currently only implemented for the
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problems. For instance:
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OpenSoundSystem (OSS) as supplied in the Linux and FreeBSD kernels
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Writes are not done asynchronously as they are supposed to be done.
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by 4Front Technologies (http://www.4front-tech.com/). The presence
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This breaks some programs (soundrec.exe from the Windows applets),
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of this driver is checked by configure (depends on the
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but doesn't worry other programs.
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<sys/soundcard.h> file).
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The implementation contains all features commonly used, but has
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several problems (see TODO list).
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TODO:
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TODO:
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- add asynchronous writes (must use threads)
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- add asynchronous reads (must use threads) as done for writes
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- verify all functions for correctness
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- verify all functions for correctness
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- add drivers for other soundsystems (Sun Audio, remote audio systems
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- add drivers for other soundsystems (Sun Audio, remote audio
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(using X extensions, ...), ALSA
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systems (using X extensions, ...), ALSA
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- WaveHdr must be sent though mmsystem.c to get the linear address
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- WaveHdr must be sent though mmsystem.c to get the linear
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set correctly. An application calling directly (wod|wid)Message
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address set correctly. An application calling directly
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will fail
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(wod|wid)Message will fail
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1.2 Mixer
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1.1.2 Wave mapper
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The Wave mapper device allows to load on-demand codecs to perform
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software conversion for the types the actual low level driver
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(hardware) does not support. Those codecs are provided thru the
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standard ACM drivers.
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The API consists of the mixer* functions found in multimedia/mmsystem.c.
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Wave mapper driver implementation has not started. Core DLL for ACM
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They call the lowlevel driver functions in multimedia/mixer.c using the
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support can be found in dlls/msacm
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mixMessage function.
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The current implementation tries to use the OpenSoundSystem mixer, but is
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missing nearly everything. There is no report of a working application.
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TODO:
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TODO:
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- implement mixing functionality for OSS correctly.
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- implement wave mapper
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- implement mixing lowlevel drivers for other mixers.
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- don't forget to fix builtin ms acm drivers loading which has
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been disabled.
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1.3 MIDI
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1.2 MIDI
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--------
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MMSYSTEM and WINMM call the lowlevel driver functions in
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multimedia/midi.c using the midMessage and the modMessage
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functions.
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1.2.1 OSS driver
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The API consists of the midi* functions found in multimedia/mmsystem.c.
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The lowlevel audio driver is currently only implemented for the
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They call the lowlevel driver functions in multimedia/midi.c using the
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OpenSoundSystem (OSS) as supplied in the Linux and FreeBSD kernels
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midMessage and the modMessage functions.
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by 4Front Technologies (http://www.4front-tech.com/). The presence
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of this driver is checked by configure (depends on the
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The lowlevel audio driver is currently only implemented for the
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<sys/soundcard.h> file, and also some specfic defines because MIDI
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OpenSoundSystem (OSS) as supplied in the Linux and FreeBSD kernels by
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is not supported on all OSes by OSS).
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4Front Technologies (http://www.4front-tech.com/). The presence of this
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Both Midi in and Midi out are provided. The type of MIDI devices
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driver is checked by configure (depends on the <sys/soundcard.h> file).
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supported is external MIDI port (requires an MIDI capable device -
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Both Midi in and Midi out are provided. The type of MIDI devices supported
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keyboard...) and OPL/2 synthesis (the OPL/2 patches for all
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is external MIDI port (requires an MIDI capable device - keyboard...) and
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instruments are in midiPatch.c).
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OPL/2 synthesis (the OPL/2 patches for all instruments are in midiPatch.c).
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TODO:
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TODO:
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- Do not implement a software synthesizer. This should be done
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- Do not implement a software synthesizer. This should be done
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using MIDI loopback devices in an external program (like timidity).
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using MIDI loopback devices in an external program (like
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the only trouble is that timidity is GPL'ed...
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timidity). The only trouble is that timidity is GPL'ed...
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- use better instrument definition for OPL/2 (midiPatch.c) or
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- use better instrument definition for OPL/2 (midiPatch.c) or
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use existing instrument definition (from playmidi or kmid)
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use existing instrument definition (from playmidi or kmid)
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with a .winerc option
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with a .winerc option
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- have a look at OPL/3 ?
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- have a look at OPL/3 ?
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- MidiHdr must be sent though mmsystem.c to get the linear address
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- MidiHdr must be sent though mmsystem.c to get the linear
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set correctly. An application calling directly (wod|wid)Message
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address set correctly. An application calling directly
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will fail
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(wod|wid)Message will fail
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- implement asynchronous playback of MidiHdr
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- implement asynchronous playback of MidiHdr (regular and/or
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stream)
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- use a more accurate read mechanism than the one of snooping
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on timers
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1.4 Timers
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1.2.2 MIDI mapper
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The API consists of the timer* functions found in multimedia/timer.c.
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Midi mapper allows to map each one of 16 MIDI channels to a
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There is currently only one implementation, which uses normal windows timers.
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specific instrument on an installed sound card. This allows for
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The implementation works for most cases found. The only problem is that
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example to support different MIDI instrument definition (XM,
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it doesn't support asynchronous timer events (as it is supposed to do).
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GM...). It also permits to output on a per channel basis to
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different MIDI renderers.
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There is a workaround for this lack in timeGetTime() to make Diablo work
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and 'Pinball! SpaceCadet' at least start up.
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TODO:
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TODO:
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- Implemented asynchronous timers (using the service thread)
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- implement the Midi mapper
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1.5 MMIO
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1.3 Mixer
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---------
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MMSYSTEM and WINMM call the lowlevel driver functions in
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multimedia/mixer.c using the mixMessage function.
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1.3.1 OSS implementation
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The current implementation uses the OpenSoundSystem mixer.
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The API consists of the mmio* functions found in multimedia/mmio.c.
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FIXME: I am not sure about the status of this implementation.
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TODO:
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TODO:
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- add win32 support.
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- implement mixing mute functionality for OSS.
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- ...
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- implement mixing lowlevel drivers for other mixers (ALSA...)
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- implement notification mechanism when state of mixer's
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controls change
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- handlers used for mixer are currently poorly implemented
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1.6 AUX
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1.4 AUX
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-------
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The API consists of the aux* functions found in multimedia/mmsystem.c.
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The API consists of the aux* functions found in
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They call auxMessage in multimedia/mmaux.c.
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multimedia/mmsystem.c. They call auxMessage in multimedia/mmaux.c.
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The aux* functions are the predecessor of the mixer* functions.
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The aux* functions are the predecessor of the mixer* functions.
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1.4.1 OSS driver
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The implementation uses the OSS mixer API, and is incomplete.
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The implementation uses the OSS mixer API, and is incomplete.
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TODO:
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TODO:
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- verify the implementation
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- verify the implementation
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- check with what is done in mixer
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- open question: shall we implement it on top of the low level
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mixer functions ?
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1.7 JOYSTICK
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1.7 JOYSTICK
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------------
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The API consists of the joy* functions found in multimedia/joystick.c.
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The API consists of the joy* functions found in
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The implementation currently uses the Linux joystick device driver API.
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multimedia/joystick.c. The implementation currently uses the Linux
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It is lacking support for enhanced joysticks and has not been extensively
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joystick device driver API. It is lacking support for enhanced
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tested.
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joysticks and has not been extensively tested.
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TODO:
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TODO:
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- better support of enhanced joysticks
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- better support of enhanced joysticks
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- support more joystick drivers (like the XInput extension)
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- support more joystick drivers (like the XInput extension)
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2. Midlevel drivers (MCI)
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2. Midlevel drivers (MCI)
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=========================
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The midlevel drivers are represented by some common API functions,
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The midlevel drivers are represented by some common API functions,
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mostly mciSendCommand and mciSendString. The mciSendString function
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mostly mciSendCommand and mciSendString.
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uses commandstrings, which are translated into normal MCI commands as
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See status in chapter 3 for more information.
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used by mciSendCommand. The API can be found in multimedia/mmsystem.c
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and multimedia/mcistring.c.
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The functions there (mciOpen,mciSysInfo) handle midlevel driver
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allocation and calls.
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The implementation is not complete.
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WINE implements several MCI midlevel drivers (status is given for
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both builtin and native implementation):
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MCI drivers are seen as regular WINE modules, and can be loaded
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(with a correct loadorder between builtin, native, elfdll, so), as
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any other DLL. Please note, that MCI drivers module names must
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bear the .drv extension to be correctly understood.
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The list of available MCI drivers is obtained as follows:
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TODO: (apply to all builtin MCI drivers)
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1/ key 'mci' in [option] section from .winerc (or wineconf)
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- move mci drivers as regular DLLs (loading in wine,
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mci=CDAUDIO:SEQUENCER
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elfglue...)
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gives the list of MCI drivers (names, in uppercase only) to
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be used in WINE.
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2/ This list, when defined, supercedes the mci
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key in c:\windows\system.ini
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TODO:
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- support windows MCI drivers (should be possible for they usually
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do not use lowlevel calls)
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- MCI command loading support
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- better implement non waiting command (without the MCI_WAIT flag).
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First shot is present in midi.c but requires much more work (and
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will impact sndPlaySound() as well which shall be written as
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as set of MCI commands).
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- implement other stuff as yet unknown
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- in mciString(), make use of hiword from mciSendMessage
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return value to convert value into string...
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- move mci drivers as regular DLLs (loading in wine, elfglue...)
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WINE implements several MCI midlevel drivers:
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2.1 CDAUDIO
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2.1 CDAUDIO
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-----------
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2.1.1 Builtin
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|
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The currently best implementation is the MCI CDAUDIO driver that can
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The currently best implementation is the MCI CDAUDIO driver that can
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be found in multimedia/mcicda.c. The implementation is mostly complete,
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be found in multimedia/mcicda.c. The implementation is mostly
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there have been no reports of errors.
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complete, there have been no reports of errors.
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It makes use of misc/cdrom.c Wine internal cdrom interface. This
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It makes use of misc/cdrom.c Wine internal cdrom interface. This
|
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interface has been ported on Linux, FreeBSD and NetBSD.
|
interface has been ported on Linux, FreeBSD and NetBSD.
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@ -182,55 +188,171 @@ services.
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A very small example of a cdplayer consists just of the line
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A very small example of a cdplayer consists just of the line
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mciSendString("play cdaudio",NULL,0,0);
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mciSendString("play cdaudio",NULL,0,0);
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|
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Native MCICDA is starting to output sounds... It uses the mscdex
|
2.1.2 Native
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traps (on int 2f).
|
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|
Native MCICDA works also correctly... It uses the mscdex traps (on
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|
int 2f).
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|
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TODO:
|
TODO:
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||||||
- add support for other cdaudio drivers
|
- add support for other cdaudio drivers (Solaris...)
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|
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2.2 MCIWAVE
|
2.2 MCIWAVE
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|
-----------
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|
|
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|
2.2.1 Builtin
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|
|
||||||
The implementation is rather complete and can be found in
|
The implementation is rather complete and can be found in
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multimedia/audio.c.
|
multimedia/audio.c.
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It uses the lowlevel audio API (although not abstracted correctly).
|
It uses the lowlevel audio API (although not abstracted
|
||||||
FIXME: The MCI_STATUS command is broken.
|
correctly).
|
||||||
|
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|
FIXME:
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||||||
|
- The MCI_STATUS command is broken.
|
||||||
|
|
||||||
TODO:
|
TODO:
|
||||||
- check for correctness
|
- check for correctness
|
||||||
- better use of asynchronous playback from low level
|
- better use of asynchronous playback from low level
|
||||||
|
- record has to be checked
|
||||||
|
- MCI_CUE command is broken
|
||||||
|
- better implement non waiting command (without the MCI_WAIT
|
||||||
|
flag).
|
||||||
|
|
||||||
Native MCIWAVE has been working but is currently blocked by
|
2.2.2 Native
|
||||||
scheduling issues.
|
|
||||||
|
|
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2.3 MIDI/SEQUENCER
|
Native MCIWAVE works also correctly.
|
||||||
|
|
||||||
|
2.3 MCISEQ (MIDI sequencer)
|
||||||
|
---------------------------
|
||||||
|
|
||||||
The implementation can be found in multimedia/midi.c. Except from the
|
2.3.1 Builtin
|
||||||
Record command, should be close to completion (except for non blocking
|
|
||||||
commands).
|
The implementation can be found in multimedia/midi.c. Except from
|
||||||
|
the Record command, should be close to completion (except for non
|
||||||
|
blocking commands).
|
||||||
|
|
||||||
TODO:
|
TODO:
|
||||||
- implement it correctly
|
- implement it correctly
|
||||||
- finish asynchronous commands
|
- finish asynchronous commands (especially for reading/record)
|
||||||
|
- better implement non waiting command (without the MCI_WAIT
|
||||||
|
flag).
|
||||||
|
|
||||||
|
2.3.2 Native
|
||||||
|
|
||||||
Native MCIMIDI has been working but is currently blocked by
|
Native MCIMIDI has been working but is currently blocked by
|
||||||
scheduling issues.
|
scheduling issues (mmTaskXXX no longer work).
|
||||||
|
|
||||||
2.4 MCIANIM
|
2.4 MCIANIM
|
||||||
|
-----------
|
||||||
|
|
||||||
The implementation consists of stubs and is in multimedia/mcianim.c.
|
2.4.1 Builtin
|
||||||
|
|
||||||
|
The implementation consists of stubs and is in
|
||||||
|
multimedia/mcianim.c.
|
||||||
|
|
||||||
TODO:
|
TODO:
|
||||||
- implement it, probably using xanim or something similair. Could
|
- implement it, probably using xanim or something similair.
|
||||||
also be implemented by using the Windows MCI video drivers.
|
|
||||||
|
2.4.2 Native
|
||||||
|
|
||||||
|
Native MCIANIM is reported to work (but requires native video DLLs
|
||||||
|
also).
|
||||||
|
|
||||||
2.5 MCIAVI
|
2.5 MCIAVI
|
||||||
|
----------
|
||||||
|
|
||||||
|
2.5.1 Builtin
|
||||||
|
|
||||||
The implementation consists of stubs and is in multimedia/mciavi.c.
|
The implementation consists of stubs and is in multimedia/mciavi.c.
|
||||||
|
|
||||||
TODO:
|
TODO:
|
||||||
- implement it, probably using xanim or something similair. Could
|
- implement it, probably using xanim or something similair.
|
||||||
also be implemented by using the Windows MCI video drivers.
|
|
||||||
|
2.5.2 Native
|
||||||
|
|
||||||
|
Native MCIAVI is reported to work (but requires native video DLLs
|
||||||
|
also). Some files exhibit some deadlock issues anyway.
|
||||||
|
|
||||||
3 High-level layers
|
3 High-level layers
|
||||||
|
===================
|
||||||
|
|
||||||
The rest (basically the MMSYSTEM and WINMM DLLs entry points).
|
The rest (basically the MMSYSTEM and WINMM DLLs entry points).
|
||||||
|
It also provides the skeletton for the core functionnalites for
|
||||||
|
multimedia rendering.
|
||||||
|
|
||||||
|
Note that native mmsystem and WINMM do not currently under WINE
|
||||||
|
and there is no plan to support them (it would require to also
|
||||||
|
fully support VxD, which is not done yet).
|
||||||
|
|
||||||
|
TODO:
|
||||||
|
- allow a dynamic loading of low level driver (should have one
|
||||||
|
for OSS, another one for ALSA...)
|
||||||
|
- add clean-up mechanisms when process detach from MM DLLs
|
||||||
|
- reimplement the sndPlay??? functions using MCI commands
|
||||||
|
rather than rewriting everything from scratch.
|
||||||
|
- prepare for the 16/32 bit split
|
||||||
|
- check thread-safeness for MMSYSTEM and WINMM entry points
|
||||||
|
|
||||||
|
3.1 MCI skeletton
|
||||||
|
-----------------
|
||||||
|
|
||||||
|
Implementation of what is needed to load/unload MCI drivers, and
|
||||||
|
to pass correct information to them. This is implemented in
|
||||||
|
multimedia/mci.c and multimedia/mcistring.c
|
||||||
|
|
||||||
|
The mciSendString function uses commandstrings, which are
|
||||||
|
translated into normal MCI commands as used by mciSendCommand.
|
||||||
|
The API can be found in multimedia/mmsystem.c and
|
||||||
|
multimedia/mcistring.c. The functions there (mciOpen,mciSysInfo)
|
||||||
|
handle midlevel driver allocation and calls.
|
||||||
|
|
||||||
|
The implementation is not complete.
|
||||||
|
|
||||||
|
MCI drivers are seen as regular WINE modules, and can be loaded
|
||||||
|
(with a correct loadorder between builtin, native, elfdll, so), as
|
||||||
|
any other DLL. Please note, that MCI drivers module names must
|
||||||
|
bear the .drv extension to be correctly understood.
|
||||||
|
|
||||||
|
The list of available MCI drivers is obtained as follows:
|
||||||
|
1/ key 'mci' in [option] section from .winerc (or wineconf)
|
||||||
|
mci=CDAUDIO:SEQUENCER
|
||||||
|
gives the list of MCI drivers (names, in uppercase only) to
|
||||||
|
be used in WINE.
|
||||||
|
2/ This list, when defined, supercedes the mci
|
||||||
|
key in c:\windows\system.ini
|
||||||
|
|
||||||
|
TODO:
|
||||||
|
- MCI command loading support mci(Load|Free)Command
|
||||||
|
- implement other stuff as yet unknown
|
||||||
|
- in mciString(), make use of hiword from mciSendMessage
|
||||||
|
return value to convert value into string...
|
||||||
|
- mmTaskXXX functions are currently broken because the 16
|
||||||
|
loader does not support binary command lines.
|
||||||
|
|
||||||
|
3.2 MCI multi-tasking
|
||||||
|
---------------------
|
||||||
|
Multi-tasking capabilities used for the MCI drivers are provided
|
||||||
|
in multimedia/mmsystem.c
|
||||||
|
|
||||||
|
3.3 Timers
|
||||||
|
----------
|
||||||
|
|
||||||
|
It currently uses a service thread, run in the context of the calling
|
||||||
|
process, which should correctly mimic Windows behaviour.
|
||||||
|
|
||||||
|
TODO:
|
||||||
|
- Check if minimal time is satisfactory for most programs.
|
||||||
|
|
||||||
|
3.4 MMIO
|
||||||
|
--------
|
||||||
|
|
||||||
|
The API consists of the mmio* functions found in multimedia/mmio.c.
|
||||||
|
|
||||||
|
Seems to work ok in most of the cases.
|
||||||
|
|
||||||
|
TODO:
|
||||||
|
- ...
|
||||||
|
|
||||||
|
@------------------------------------@
|
||||||
|
@ Last updated: 12, May 1999 @
|
||||||
|
@ Eric Pouech <eric.pouech@lemel.fr> @
|
||||||
|
@------------------------------------@
|
||||||
|
|||||||
Loading…
x
Reference in New Issue
Block a user