audlinux_alsa.h
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- /* ***** BEGIN LICENSE BLOCK *****
- * Source last modified: $Id: audlinux_alsa.h,v 1.1.2.1 2004/07/09 02:02:00 hubbe Exp $
- *
- * Portions Copyright (c) 1995-2004 RealNetworks, Inc. All Rights Reserved.
- *
- * The contents of this file, and the files included with this file,
- * are subject to the current version of the RealNetworks Public
- * Source License (the "RPSL") available at
- * http://www.helixcommunity.org/content/rpsl unless you have licensed
- * the file under the current version of the RealNetworks Community
- * Source License (the "RCSL") available at
- * http://www.helixcommunity.org/content/rcsl, in which case the RCSL
- * will apply. You may also obtain the license terms directly from
- * RealNetworks. You may not use this file except in compliance with
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- * to this file, the RCSL. Please see the applicable RPSL or RCSL for
- * the rights, obligations and limitations governing use of the
- * contents of the file.
- *
- * Alternatively, the contents of this file may be used under the
- * terms of the GNU General Public License Version 2 or later (the
- * "GPL") in which case the provisions of the GPL are applicable
- * instead of those above. If you wish to allow use of your version of
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- * or RCSL, indicate your decision by deleting the provisions above
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- * use your version of this file under the terms of any one of the
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- * This file is part of the Helix DNA Technology. RealNetworks is the
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- * portions it created.
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- * This file, and the files included with this file, is distributed
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- * KIND, EITHER EXPRESS OR IMPLIED, AND REALNETWORKS HEREBY DISCLAIMS
- * ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES
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- * ***** END LICENSE BLOCK ***** */
- #ifndef _AUDLINUXALSA
- #define _AUDLINUXALSA
- //-----------------------------------------------
- // System includes.
- //-----------------------------------------------
- #if defined( _LINUX )
- //&& !defined( __powerpc__ ) && !defined __alpha && !defined __sparc__
- #include <alsa/asoundlib.h>
- //#include "linux/soundcard.h"
- //#elif defined(__powerpc__)
- //#include "sys/soundcard.h"
- //#elif defined _NETBSD
- //#include "soundcard.h"
- //#elif defined _SCO_UW
- //#include <sys/soundcard.h>
- //#elif defined _FREEBSD || defined __alpha || defined __sparc__
- //#include "machine/soundcard.h"
- //#else
- //#include "machine/soundcard.h"
- #endif
- //------------------------------------------------
- // local includes
- //------------------------------------------------
- #include "hxcom.h"
- #include "hxslist.h"
- #include "audUnix.h"
- class CAudioOutLinuxAlsa : public CAudioOutUNIX
- {
- public:
- CAudioOutLinuxAlsa();
- virtual ~CAudioOutLinuxAlsa();
- protected:
-
- //-------------------------------------------------------
- //
- // Pure virtuals from CAudioOutUNIX.
- //
- //-------------------------------------------------------
- virtual INT16 _Imp_GetAudioFd(void);
- //This ones important.
- virtual UINT64 _GetBytesActualyPlayed(void) const;
- //Devic specific method to set the audio device characteristics. Sample rate,
- //bits-per-sample, etc.
- //Method *must* set member vars. m_unSampleRate and m_unNumChannels.
- virtual HX_RESULT _SetDeviceConfig( const HXAudioFormat* pFormat );
- //Device specific method to test wether or not the device supports the
- //give sample rate. If the device can not be opened, or otherwise tested,
- //it should return RA_AOE_DEVBUSY.
- virtual HX_RESULT _CheckSampleRate( ULONG32 ulSampleRate );
- virtual HX_RESULT _CheckFormat( const HXAudioFormat* pFormat );
- //Device specific method to write bytes out to the audiodevice and return a
- //count of bytes written.
- virtual HX_RESULT _WriteBytes( UCHAR* buffer, ULONG32 ulBuffLength, LONG32& lCount );
- //Device specific methods to open/close the mixer and audio devices.
- virtual HX_RESULT _OpenAudio();
- virtual HX_RESULT _CloseAudio();
- virtual HX_RESULT _OpenMixer();
- virtual HX_RESULT _CloseMixer();
- //Device specific method to reset device and return it to a state that it
- //can accept new sample rates, num channels, etc.
- virtual HX_RESULT _Reset();
- virtual HX_RESULT _Pause();
- virtual HX_RESULT _Resume();
- //Device specific method to get/set the devices current volume.
- virtual UINT16 _GetVolume() const;
- virtual HX_RESULT _SetVolume(UINT16 volume);
- //Device specific method to drain a device. This should play the remaining
- //bytes in the devices buffer and then return.
- virtual HX_RESULT _Drain();
- //Device specific method to return the amount of room available on the
- //audio device that can be written without blocking.
- virtual HX_RESULT _GetRoomOnDevice( ULONG32& ulBytes) const;
- //A mehtod to let us know if the hardware supports puase/resume.
- //We can use this to remove unneeded memcpys and other expensive
- //operations. The default implementation is 'No, not supported'.
- virtual BOOL _HardwarePauseSupported() const;
- //-----------------------------------------------
- // Some helper methods.
- //-----------------------------------------------
- void _SyncUpTimeStamps(ULONG32 lCount=0);
-
- private:
-
- //protect the unintentional copy ctor.
- CAudioOutLinuxAlsa( const CAudioOutLinuxAlsa & ); //Not implemented.
- ULONG32 m_ulLastTimeStamp;
- ULONG32 m_ulTickCount;
- UINT64 m_ulPausePosition;
- UINT64 m_ulLastBytesPlayed;
- snd_pcm_t *pcm_handle;
- snd_mixer_t *mixer_handle;
- // snd_pcm_stream_t stream;// = SND_PCM_STREAM_PLAYBACK;
- snd_pcm_hw_params_t *hwparams;
- snd_pcm_sw_params_t *swparams;
- size_t m_frameBytes;
- snd_pcm_status_t *status;
- long channels, samplesize, blocksize;
- mutable BOOL m_bHasHardwarePause;
- mutable BOOL m_bHasHardwareResume;
- };
- #endif //_AUDIOOUTLINUXALSA