ALSA backend (based on Dummy backend and zita-alsa-pcmi)

1 files changed, 188 insertions, 0 deletions

diff --git a/libs/backends/alsa/zita-alsa-pcmi.h b/libs/backends/alsa/zita-alsa-pcmi.h
new file mode 100644
index 0000000000..5f7377db5c
--- /dev/null
+++ b/libs/backends/alsa/zita-alsa-pcmi.h
@@ -0,0 +1,188 @@
+// ----------------------------------------------------------------------------
+//
+//  Copyright (C) 2006-2012 Fons Adriaensen <fons@linuxaudio.org>
+//
+//  This program is free software; you can redistribute it and/or modify
+//  it under the terms of the GNU General Public License as published by
+//  the Free Software Foundation; either version 3 of the License, or
+//  (at your option) any later version.
+//
+//  This program is distributed in the hope that it will be useful,
+//  but WITHOUT ANY WARRANTY; without even the implied warranty of
+//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//  GNU General Public License for more details.
+//
+//  You should have received a copy of the GNU General Public License
+//  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+// ----------------------------------------------------------------------------
+
+
+#ifndef _ZITA_ALSA_PCMI_H_
+#define _ZITA_ALSA_PCMI_H_
+
+
+#define ALSA_PCM_NEW_HW_PARAMS_API
+#define ALSA_PCM_NEW_SW_PARAMS_API
+#include <alsa/asoundlib.h>
+
+
+#define ZITA_ALSA_PCMI_MAJOR_VERSION 0
+#define ZITA_ALSA_PCMI_MINOR_VERSION 2
+
+#include <stdint.h>
+
+extern int zita_alsa_pcmi_major_version (void);
+extern int zita_alsa_pcmi_minor_version (void);
+
+
+class Alsa_pcmi
+{
+public:
+
+	Alsa_pcmi (
+			const char   *play_name,
+			const char   *capt_name,
+			const char   *ctrl_name,
+			unsigned int  rate,
+			unsigned int  frsize,
+			unsigned int  nfrags,
+			unsigned int  debug = 0);
+
+	~Alsa_pcmi (void);
+
+	enum
+	{
+		DEBUG_INIT = 1,
+		DEBUG_STAT = 2,
+		DEBUG_WAIT = 4,
+		DEBUG_DATA = 8,
+		DEBUG_ALL  = 15,
+		FORCE_16B  = 256,
+		FORCE_2CH  = 512
+	};
+
+	void printinfo (void);
+
+	int pcm_start (void);
+	int pcm_stop (void);
+	snd_pcm_sframes_t pcm_wait (void);
+	int pcm_idle (int len);
+
+	int play_init (snd_pcm_uframes_t len);
+	void clear_chan (int chan, int len);
+	void play_chan (int chan, const float *src, int len, int step = 1);
+	int play_done (int len);
+
+	int capt_init (snd_pcm_uframes_t len);
+	void capt_chan (int chan, float *dst, int len, int step = 1);
+	int capt_done (int len);
+
+	int play_avail (void)
+	{
+		return snd_pcm_avail (_play_handle);
+	}
+
+	int capt_avail (void)
+	{
+		return snd_pcm_avail (_capt_handle);
+	}
+
+	int play_delay (void)
+	{
+		long k;
+		snd_pcm_delay (_play_handle, &k);
+		return k;
+	}
+
+	int capt_delay (void)
+	{
+		long k;
+		snd_pcm_delay (_capt_handle, &k);
+		return k;
+	}
+
+	float play_xrun (void) const { return _play_xrun; }
+	float capt_xrun (void) const { return _capt_xrun; }
+
+	int      state (void) const { return _state; }
+	size_t   fsize (void) const { return _fsize; }
+	uint32_t fsamp (void) const { return _fsamp; }
+	uint32_t nfrag (void) const { return _nfrag; }
+	uint32_t nplay (void) const { return _play_nchan; }
+	uint32_t ncapt (void) const { return _capt_nchan; }
+	snd_pcm_t *play_handle (void) const { return _play_handle; }
+	snd_pcm_t *capt_handle (void) const { return _capt_handle; }
+
+
+private:
+
+	typedef char *(Alsa_pcmi::*clear_function)(char *, int);
+	typedef char *(Alsa_pcmi::*play_function)(const float *, char *, int, int);
+	typedef const char *(Alsa_pcmi::*capt_function) (const char *, float *, int, int);
+
+	enum { MAXPFD = 16, MAXCHAN = 64 };
+
+	void initialise (const char *play_name, const char *capt_name, const char *ctrl_name);
+	int set_hwpar (snd_pcm_t *handle, snd_pcm_hw_params_t *hwpar, const char *sname, unsigned int *nchan);
+	int set_swpar (snd_pcm_t *handle, snd_pcm_sw_params_t *swpar, const char *sname);
+	int recover (void);
+	float xruncheck (snd_pcm_status_t *stat);
+
+	char *clear_32 (char *dst, int nfrm);
+	char *clear_24 (char *dst, int nfrm);
+	char *clear_16 (char *dst, int nfrm);
+
+	char *play_float (const float *src, char *dst, int nfrm, int step);
+	char *play_32 (const float *src, char *dst, int nfrm, int step);
+	char *play_24 (const float *src, char *dst, int nfrm, int step);
+	char *play_16 (const float *src, char *dst, int nfrm, int step);
+	char *play_32swap (const float *src, char *dst, int nfrm, int step);
+	char *play_24swap (const float *src, char *dst, int nfrm, int step);
+	char *play_16swap (const float *src, char *dst, int nfrm, int step);
+
+	const char *capt_float (const char *src, float *dst, int nfrm, int step);
+	const char *capt_32 (const char *src, float *dst, int nfrm, int step);
+	const char *capt_24 (const char *src, float *dst, int nfrm, int step);
+	const char *capt_16 (const char *src, float *dst, int nfrm, int step);
+	const char *capt_32swap (const char *src, float *dst, int nfrm, int step);
+	const char *capt_24swap (const char *src, float *dst, int nfrm, int step);
+	const char *capt_16swap (const char *src, float *dst, int nfrm, int step);
+
+	unsigned int           _fsamp;
+	snd_pcm_uframes_t      _fsize;
+	unsigned int           _nfrag;
+	unsigned int           _debug;
+	int                    _state;
+	snd_pcm_t             *_play_handle;
+	snd_pcm_t             *_capt_handle;
+	snd_ctl_t             *_ctrl_handle;
+	snd_pcm_hw_params_t   *_play_hwpar;
+	snd_pcm_sw_params_t   *_play_swpar;
+	snd_pcm_hw_params_t   *_capt_hwpar;
+	snd_pcm_sw_params_t   *_capt_swpar;
+	snd_pcm_format_t       _play_format;
+	snd_pcm_format_t       _capt_format;
+	snd_pcm_access_t       _play_access;
+	snd_pcm_access_t       _capt_access;
+	unsigned int           _play_nchan;
+	unsigned int           _capt_nchan;
+	float                  _play_xrun;
+	float                  _capt_xrun;
+	bool                   _synced;
+	int                    _play_npfd;
+	int                    _capt_npfd;
+	struct pollfd          _poll_fd [MAXPFD];
+	snd_pcm_uframes_t      _capt_offs;
+	snd_pcm_uframes_t      _play_offs;
+	int                    _play_step;
+	int                    _capt_step;
+	char                  *_play_ptr [MAXCHAN];
+	const char            *_capt_ptr [MAXCHAN];
+	clear_function         _clear_func;
+	play_function          _play_func;
+	capt_function          _capt_func;
+	void                  *_dummy [16];
+};
+
+#endif