[sdl_omap.git] / src / audio / pulse / SDL_pulseaudio.c

/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2009 Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library 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
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Stéphan Kochen
    stephan@kochen.nl

    Based on parts of the ALSA and ESounD output drivers.
*/
#include "SDL_config.h"

/* Allow access to an PulseAudio network stream mixing buffer */

#include <sys/types.h>
#include <unistd.h>
#include <signal.h>
#include <errno.h>
#include <pulse/pulseaudio.h>
#include <pulse/simple.h>

#include "SDL_timer.h"
#include "SDL_audio.h"
#include "../SDL_audiomem.h"
#include "../SDL_audio_c.h"
#include "../SDL_audiodev_c.h"
#include "SDL_pulseaudio.h"

#ifdef SDL_AUDIO_DRIVER_PULSE_DYNAMIC
#include "SDL_name.h"
#include "SDL_loadso.h"
#else
#define SDL_NAME(X)	X
#endif

/* The tag name used by the driver */
#define PULSE_DRIVER_NAME	"pulse"

/* Audio driver functions */
static int PULSE_OpenAudio(_THIS, SDL_AudioSpec *spec);
static void PULSE_WaitAudio(_THIS);
static void PULSE_PlayAudio(_THIS);
static Uint8 *PULSE_GetAudioBuf(_THIS);
static void PULSE_CloseAudio(_THIS);
static void PULSE_WaitDone(_THIS);

#ifdef SDL_AUDIO_DRIVER_PULSE_DYNAMIC

static const char *pulse_library = SDL_AUDIO_DRIVER_PULSE_DYNAMIC;
static void *pulse_handle = NULL;
static int pulse_loaded = 0;

static pa_simple* (*SDL_NAME(pa_simple_new))(
	const char *server,
	const char *name,
	pa_stream_direction_t dir,
	const char *dev,
	const char *stream_name,
	const pa_sample_spec *ss,
	const pa_channel_map *map,
	const pa_buffer_attr *attr,
	int *error
);
static void (*SDL_NAME(pa_simple_free))(pa_simple *s);

static pa_channel_map* (*SDL_NAME(pa_channel_map_init_auto))(
	pa_channel_map *m,
	unsigned channels,
	pa_channel_map_def_t def
);

pa_mainloop * (*SDL_NAME(pa_mainloop_new))(void);
pa_mainloop_api * (*SDL_NAME(pa_mainloop_get_api))(pa_mainloop *m);
int (*SDL_NAME(pa_mainloop_iterate))(pa_mainloop *m, int block, int *retval);
void (*SDL_NAME(pa_mainloop_free))(pa_mainloop *m);

pa_operation_state_t (*SDL_NAME(pa_operation_get_state))(pa_operation *o);
void (*SDL_NAME(pa_operation_cancel))(pa_operation *o);
void (*SDL_NAME(pa_operation_unref))(pa_operation *o);

pa_context * (*SDL_NAME(pa_context_new))(
	pa_mainloop_api *m, const char *name);
int (*SDL_NAME(pa_context_connect))(
	pa_context *c, const char *server,
	pa_context_flags_t flags, const pa_spawn_api *api);
pa_context_state_t (*SDL_NAME(pa_context_get_state))(pa_context *c);
void (*SDL_NAME(pa_context_disconnect))(pa_context *c);
void (*SDL_NAME(pa_context_unref))(pa_context *c);

pa_stream * (*SDL_NAME(pa_stream_new))(pa_context *c,
	const char *name, const pa_sample_spec *ss, const pa_channel_map *map);
int (*SDL_NAME(pa_stream_connect_playback))(pa_stream *s, const char *dev,
	const pa_buffer_attr *attr, pa_stream_flags_t flags,
	pa_cvolume *volume, pa_stream *sync_stream);
pa_stream_state_t (*SDL_NAME(pa_stream_get_state))(pa_stream *s);
size_t (*SDL_NAME(pa_stream_writable_size))(pa_stream *s);
int (*SDL_NAME(pa_stream_write))(pa_stream *s, const void *data, size_t nbytes,
	pa_free_cb_t free_cb, int64_t offset, pa_seek_mode_t seek);
pa_operation * (*SDL_NAME(pa_stream_drain))(pa_stream *s,
	pa_stream_success_cb_t cb, void *userdata);
int (*SDL_NAME(pa_stream_disconnect))(pa_stream *s);
void (*SDL_NAME(pa_stream_unref))(pa_stream *s);

static struct {
	const char *name;
	void **func;
} pulse_functions[] = {
	{ "pa_simple_new",
		(void **)&SDL_NAME(pa_simple_new)		},
	{ "pa_simple_free",
		(void **)&SDL_NAME(pa_simple_free)		},
	{ "pa_channel_map_init_auto",
		(void **)&SDL_NAME(pa_channel_map_init_auto)	},
	{ "pa_mainloop_new",
		(void **)&SDL_NAME(pa_mainloop_new)		},
	{ "pa_mainloop_get_api",
		(void **)&SDL_NAME(pa_mainloop_get_api)		},
	{ "pa_mainloop_iterate",
		(void **)&SDL_NAME(pa_mainloop_iterate)		},
	{ "pa_mainloop_free",
		(void **)&SDL_NAME(pa_mainloop_free)		},
	{ "pa_operation_get_state",
		(void **)&SDL_NAME(pa_operation_get_state)	},
	{ "pa_operation_cancel",
		(void **)&SDL_NAME(pa_operation_cancel)		},
	{ "pa_operation_unref",
		(void **)&SDL_NAME(pa_operation_unref)		},
	{ "pa_context_new",
		(void **)&SDL_NAME(pa_context_new)		},
	{ "pa_context_connect",
		(void **)&SDL_NAME(pa_context_connect)		},
	{ "pa_context_get_state",
		(void **)&SDL_NAME(pa_context_get_state)	},
	{ "pa_context_disconnect",
		(void **)&SDL_NAME(pa_context_disconnect)	},
	{ "pa_context_unref",
		(void **)&SDL_NAME(pa_context_unref)		},
	{ "pa_stream_new",
		(void **)&SDL_NAME(pa_stream_new)		},
	{ "pa_stream_connect_playback",
		(void **)&SDL_NAME(pa_stream_connect_playback)	},
	{ "pa_stream_get_state",
		(void **)&SDL_NAME(pa_stream_get_state)		},
	{ "pa_stream_writable_size",
		(void **)&SDL_NAME(pa_stream_writable_size)	},
	{ "pa_stream_write",
		(void **)&SDL_NAME(pa_stream_write)		},
	{ "pa_stream_drain",
		(void **)&SDL_NAME(pa_stream_drain)		},
	{ "pa_stream_disconnect",
		(void **)&SDL_NAME(pa_stream_disconnect)	},
	{ "pa_stream_unref",
		(void **)&SDL_NAME(pa_stream_unref)		},
};

static void UnloadPulseLibrary()
{
	if ( pulse_loaded ) {
		SDL_UnloadObject(pulse_handle);
		pulse_handle = NULL;
		pulse_loaded = 0;
	}
}

static int LoadPulseLibrary(void)
{
	int i, retval = -1;

	pulse_handle = SDL_LoadObject(pulse_library);
	if ( pulse_handle ) {
		pulse_loaded = 1;
		retval = 0;
		for ( i=0; i<SDL_arraysize(pulse_functions); ++i ) {
			*pulse_functions[i].func = SDL_LoadFunction(pulse_handle, pulse_functions[i].name);
			if ( !*pulse_functions[i].func ) {
				retval = -1;
				UnloadPulseLibrary();
				break;
			}
		}
	}
	return retval;
}

#else

static void UnloadPulseLibrary()
{
	return;
}

static int LoadPulseLibrary(void)
{
	return 0;
}

#endif /* SDL_AUDIO_DRIVER_PULSE_DYNAMIC */

/* Audio driver bootstrap functions */

static int Audio_Available(void)
{
	pa_sample_spec paspec;
	pa_simple *connection;
	int available;

	available = 0;
	if ( LoadPulseLibrary() < 0 ) {
		return available;
	}

	/* Connect with a dummy format. */
	paspec.format = PA_SAMPLE_U8;
	paspec.rate = 11025;
	paspec.channels = 1;
	connection = SDL_NAME(pa_simple_new)(
		NULL,                        /* server */
		"Test stream",               /* application name */
		PA_STREAM_PLAYBACK,          /* playback mode */
		NULL,                        /* device on the server */
		"Simple DirectMedia Layer",  /* stream description */
		&paspec,                     /* sample format spec */
		NULL,                        /* channel map */
		NULL,                        /* buffering attributes */
		NULL                         /* error code */
	);
	if ( connection != NULL ) {
		available = 1;
		SDL_NAME(pa_simple_free)(connection);
	}

	UnloadPulseLibrary();
	return(available);
}

static void Audio_DeleteDevice(SDL_AudioDevice *device)
{
	SDL_free(device->hidden);
	SDL_free(device);
	UnloadPulseLibrary();
}

static SDL_AudioDevice *Audio_CreateDevice(int devindex)
{
	SDL_AudioDevice *this;

	/* Initialize all variables that we clean on shutdown */
	LoadPulseLibrary();
	this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice));
	if ( this ) {
		SDL_memset(this, 0, (sizeof *this));
		this->hidden = (struct SDL_PrivateAudioData *)
				SDL_malloc((sizeof *this->hidden));
	}
	if ( (this == NULL) || (this->hidden == NULL) ) {
		SDL_OutOfMemory();
		if ( this ) {
			SDL_free(this);
		}
		return(0);
	}
	SDL_memset(this->hidden, 0, (sizeof *this->hidden));

	/* Set the function pointers */
	this->OpenAudio = PULSE_OpenAudio;
	this->WaitAudio = PULSE_WaitAudio;
	this->PlayAudio = PULSE_PlayAudio;
	this->GetAudioBuf = PULSE_GetAudioBuf;
	this->CloseAudio = PULSE_CloseAudio;
	this->WaitDone = PULSE_WaitDone;

	this->free = Audio_DeleteDevice;

	return this;
}

AudioBootStrap PULSE_bootstrap = {
	PULSE_DRIVER_NAME, "PulseAudio",
	Audio_Available, Audio_CreateDevice
};

/* This function waits until it is possible to write a full sound buffer */
static void PULSE_WaitAudio(_THIS)
{
	int size;
	while(1) {
		if (SDL_NAME(pa_context_get_state)(context) != PA_CONTEXT_READY ||
		    SDL_NAME(pa_stream_get_state)(stream) != PA_STREAM_READY ||
		    SDL_NAME(pa_mainloop_iterate)(mainloop, 1, NULL) < 0) {
			this->enabled = 0;
			return;
		}
		size = SDL_NAME(pa_stream_writable_size)(stream);
		if (size >= mixlen)
			return;
	}
}

static void PULSE_PlayAudio(_THIS)
{
	/* Write the audio data */
	if (SDL_NAME(pa_stream_write)(stream, mixbuf, mixlen, NULL, 0LL, PA_SEEK_RELATIVE) < 0)
		this->enabled = 0;
}

static Uint8 *PULSE_GetAudioBuf(_THIS)
{
	return(mixbuf);
}

static void PULSE_CloseAudio(_THIS)
{
	if ( mixbuf != NULL ) {
		SDL_FreeAudioMem(mixbuf);
		mixbuf = NULL;
	}
	if ( stream != NULL ) {
		SDL_NAME(pa_stream_disconnect)(stream);
		SDL_NAME(pa_stream_unref)(stream);
		stream = NULL;
	}
	if (context != NULL) {
		SDL_NAME(pa_context_disconnect)(context);
		SDL_NAME(pa_context_unref)(context);
		context = NULL;
	}
	if (mainloop != NULL) {
		SDL_NAME(pa_mainloop_free)(mainloop);
		mainloop = NULL;
	}
}

/* Try to get the name of the program */
static char *get_progname(void)
{
#ifdef __LINUX__
	char *progname = NULL;
	FILE *fp;
	static char temp[BUFSIZ];

	SDL_snprintf(temp, SDL_arraysize(temp), "/proc/%d/cmdline", getpid());
	fp = fopen(temp, "r");
	if ( fp != NULL ) {
		if ( fgets(temp, sizeof(temp)-1, fp) ) {
			progname = SDL_strrchr(temp, '/');
			if ( progname == NULL ) {
				progname = temp;
			} else {
				progname = progname+1;
			}
		}
		fclose(fp);
	}
	return(progname);
#elif defined(__NetBSD__)
	return getprogname();
#else
	return("unknown");
#endif
}

static void stream_drain_complete(pa_stream *s, int success, void *userdata) {
}

static void PULSE_WaitDone(_THIS)
{
	pa_operation *o;

	o = SDL_NAME(pa_stream_drain)(stream, stream_drain_complete, NULL);
	if (!o)
		return;

	while (SDL_NAME(pa_operation_get_state)(o) != PA_OPERATION_DONE) {
		if (SDL_NAME(pa_context_get_state)(context) != PA_CONTEXT_READY ||
		    SDL_NAME(pa_stream_get_state)(stream) != PA_STREAM_READY ||
		    SDL_NAME(pa_mainloop_iterate)(mainloop, 1, NULL) < 0) {
			SDL_NAME(pa_operation_cancel)(o);
			break;
		}
	}
	SDL_NAME(pa_operation_unref)(o);
}

static int PULSE_OpenAudio(_THIS, SDL_AudioSpec *spec)
{
	int             state;
	Uint16          test_format;
	pa_sample_spec  paspec;
	pa_buffer_attr  paattr;
	pa_channel_map  pacmap;
	pa_stream_flags_t flags = 0;

	paspec.format = PA_SAMPLE_INVALID;
	for ( test_format = SDL_FirstAudioFormat(spec->format); test_format; ) {
		switch ( test_format ) {
			case AUDIO_U8:
				paspec.format = PA_SAMPLE_U8;
				break;
			case AUDIO_S16LSB:
				paspec.format = PA_SAMPLE_S16LE;
				break;
			case AUDIO_S16MSB:
				paspec.format = PA_SAMPLE_S16BE;
				break;
		}
		if ( paspec.format != PA_SAMPLE_INVALID )
			break;
	}
	if (paspec.format == PA_SAMPLE_INVALID ) {
		SDL_SetError("Couldn't find any suitable audio formats");
		return(-1);
	}
	spec->format = test_format;

	paspec.channels = spec->channels;
	paspec.rate = spec->freq;

	/* Calculate the final parameters for this audio specification */
#ifdef PA_STREAM_ADJUST_LATENCY
	spec->samples /= 2; /* Mix in smaller chunck to avoid underruns */
#endif
	SDL_CalculateAudioSpec(spec);

	/* Allocate mixing buffer */
	mixlen = spec->size;
	mixbuf = (Uint8 *)SDL_AllocAudioMem(mixlen);
	if ( mixbuf == NULL ) {
		return(-1);
	}
	SDL_memset(mixbuf, spec->silence, spec->size);

	/* Reduced prebuffering compared to the defaults. */
#ifdef PA_STREAM_ADJUST_LATENCY
	paattr.tlength = mixlen * 4; /* 2x original requested bufsize */
	paattr.prebuf = -1;
	paattr.maxlength = -1;
	paattr.minreq = mixlen; /* -1 can lead to pa_stream_writable_size()
				   >= mixlen never becoming true */
	flags = PA_STREAM_ADJUST_LATENCY;
#else
	paattr.tlength = mixlen*2;
	paattr.prebuf = mixlen*2;
	paattr.maxlength = mixlen*2;
	paattr.minreq = mixlen;
#endif

	/* The SDL ALSA output hints us that we use Windows' channel mapping */
	/* http://bugzilla.libsdl.org/show_bug.cgi?id=110 */
	SDL_NAME(pa_channel_map_init_auto)(
		&pacmap, spec->channels, PA_CHANNEL_MAP_WAVEEX);

	/* Set up a new main loop */
	if (!(mainloop = SDL_NAME(pa_mainloop_new)())) {
		PULSE_CloseAudio(this);
		SDL_SetError("pa_mainloop_new() failed");
		return(-1);
	}

	mainloop_api = SDL_NAME(pa_mainloop_get_api)(mainloop);
	if (!(context = SDL_NAME(pa_context_new)(mainloop_api, get_progname()))) {
		PULSE_CloseAudio(this);
		SDL_SetError("pa_context_new() failed");
		return(-1);
	}

	/* Connect to the PulseAudio server */
	if (SDL_NAME(pa_context_connect)(context, NULL, 0, NULL) < 0) {
		PULSE_CloseAudio(this);
	        SDL_SetError("Could not setup connection to PulseAudio");
		return(-1);
	}

	do {
		if (SDL_NAME(pa_mainloop_iterate)(mainloop, 1, NULL) < 0) {
			PULSE_CloseAudio(this);
			SDL_SetError("pa_mainloop_iterate() failed");
			return(-1);
		}
		state = SDL_NAME(pa_context_get_state)(context);
		if (!PA_CONTEXT_IS_GOOD(state)) {
			PULSE_CloseAudio(this);
			SDL_SetError("Could not connect to PulseAudio");
			return(-1);
		}
	} while (state != PA_CONTEXT_READY);

	stream = SDL_NAME(pa_stream_new)(
		context,
		"Simple DirectMedia Layer",  /* stream description */
		&paspec,                     /* sample format spec */
		&pacmap                      /* channel map */
	);
	if ( stream == NULL ) {
		PULSE_CloseAudio(this);
		SDL_SetError("Could not setup PulseAudio stream");
		return(-1);
	}

	if (SDL_NAME(pa_stream_connect_playback)(stream, NULL, &paattr, flags,
			NULL, NULL) < 0) {
		PULSE_CloseAudio(this);
		SDL_SetError("Could not connect PulseAudio stream");
		return(-1);
	}

	do {
		if (SDL_NAME(pa_mainloop_iterate)(mainloop, 1, NULL) < 0) {
			PULSE_CloseAudio(this);
			SDL_SetError("pa_mainloop_iterate() failed");
			return(-1);
		}
		state = SDL_NAME(pa_stream_get_state)(stream);
		if (!PA_STREAM_IS_GOOD(state)) {
			PULSE_CloseAudio(this);
			SDL_SetError("Could not create to PulseAudio stream");
			return(-1);
		}
	} while (state != PA_STREAM_READY);

	return(0);
}
Commit	Line	Data
e14743d1	1	/*
	2	SDL - Simple DirectMedia Layer
	3	Copyright (C) 1997-2009 Sam Lantinga
	4
	5	This library is free software; you can redistribute it and/or
	6	modify it under the terms of the GNU Lesser General Public
	7	License as published by the Free Software Foundation; either
	8	version 2.1 of the License, or (at your option) any later version.
	9
	10	This library is distributed in the hope that it will be useful,
	11	but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	13	Lesser General Public License for more details.
	14
	15	You should have received a copy of the GNU Lesser General Public
	16	License along with this library; if not, write to the Free Software
	17	Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	18
	19	Stéphan Kochen
	20	stephan@kochen.nl
	21
	22	Based on parts of the ALSA and ESounD output drivers.
	23	*/
	24	#include "SDL_config.h"
	25
	26	/* Allow access to an PulseAudio network stream mixing buffer */
	27
	28	#include <sys/types.h>
	29	#include <unistd.h>
	30	#include <signal.h>
	31	#include <errno.h>
	32	#include <pulse/pulseaudio.h>
	33	#include <pulse/simple.h>
	34
	35	#include "SDL_timer.h"
	36	#include "SDL_audio.h"
	37	#include "../SDL_audiomem.h"
	38	#include "../SDL_audio_c.h"
	39	#include "../SDL_audiodev_c.h"
	40	#include "SDL_pulseaudio.h"
	41
	42	#ifdef SDL_AUDIO_DRIVER_PULSE_DYNAMIC
	43	#include "SDL_name.h"
	44	#include "SDL_loadso.h"
	45	#else
	46	#define SDL_NAME(X) X
	47	#endif
	48
	49	/* The tag name used by the driver */
	50	#define PULSE_DRIVER_NAME "pulse"
	51
	52	/* Audio driver functions */
	53	static int PULSE_OpenAudio(_THIS, SDL_AudioSpec *spec);
	54	static void PULSE_WaitAudio(_THIS);
	55	static void PULSE_PlayAudio(_THIS);
	56	static Uint8 *PULSE_GetAudioBuf(_THIS);
	57	static void PULSE_CloseAudio(_THIS);
	58	static void PULSE_WaitDone(_THIS);
	59
	60	#ifdef SDL_AUDIO_DRIVER_PULSE_DYNAMIC
	61
	62	static const char *pulse_library = SDL_AUDIO_DRIVER_PULSE_DYNAMIC;
	63	static void *pulse_handle = NULL;
	64	static int pulse_loaded = 0;
65
66	static pa_simple* (*SDL_NAME(pa_simple_new))(
67	const char *server,
68	const char *name,
69	pa_stream_direction_t dir,
70	const char *dev,
71	const char *stream_name,
72	const pa_sample_spec *ss,
73	const pa_channel_map *map,
74	const pa_buffer_attr *attr,
75	int *error
76	);
77	static void (SDL_NAME(pa_simple_free))(pa_simple s);
78
79	static pa_channel_map* (*SDL_NAME(pa_channel_map_init_auto))(
80	pa_channel_map *m,
81	unsigned channels,
82	pa_channel_map_def_t def
83	);
84
85	pa_mainloop * (*SDL_NAME(pa_mainloop_new))(void);
86	pa_mainloop_api * (SDL_NAME(pa_mainloop_get_api))(pa_mainloop m);
87	int (SDL_NAME(pa_mainloop_iterate))(pa_mainloop m, int block, int *retval);
88	void (SDL_NAME(pa_mainloop_free))(pa_mainloop m);
89
90	pa_operation_state_t (SDL_NAME(pa_operation_get_state))(pa_operation o);
91	void (SDL_NAME(pa_operation_cancel))(pa_operation o);
92	void (SDL_NAME(pa_operation_unref))(pa_operation o);
93
94	pa_context * (*SDL_NAME(pa_context_new))(
95	pa_mainloop_api m, const char name);
96	int (*SDL_NAME(pa_context_connect))(
97	pa_context c, const char server,
98	pa_context_flags_t flags, const pa_spawn_api *api);
99	pa_context_state_t (SDL_NAME(pa_context_get_state))(pa_context c);
100	void (SDL_NAME(pa_context_disconnect))(pa_context c);
101	void (SDL_NAME(pa_context_unref))(pa_context c);
102
103	pa_stream * (SDL_NAME(pa_stream_new))(pa_context c,
104	const char name, const pa_sample_spec ss, const pa_channel_map *map);
105	int (SDL_NAME(pa_stream_connect_playback))(pa_stream s, const char *dev,
106	const pa_buffer_attr *attr, pa_stream_flags_t flags,
107	pa_cvolume volume, pa_stream sync_stream);
108	pa_stream_state_t (SDL_NAME(pa_stream_get_state))(pa_stream s);
109	size_t (SDL_NAME(pa_stream_writable_size))(pa_stream s);
110	int (SDL_NAME(pa_stream_write))(pa_stream s, const void *data, size_t nbytes,
111	pa_free_cb_t free_cb, int64_t offset, pa_seek_mode_t seek);
112	pa_operation * (SDL_NAME(pa_stream_drain))(pa_stream s,
113	pa_stream_success_cb_t cb, void *userdata);
114	int (SDL_NAME(pa_stream_disconnect))(pa_stream s);
115	void (SDL_NAME(pa_stream_unref))(pa_stream s);
116
117	static struct {
118	const char *name;
119	void **func;
120	} pulse_functions[] = {
121	{ "pa_simple_new",
122	(void **)&SDL_NAME(pa_simple_new) },
123	{ "pa_simple_free",
124	(void **)&SDL_NAME(pa_simple_free) },
125	{ "pa_channel_map_init_auto",
126	(void **)&SDL_NAME(pa_channel_map_init_auto) },
127	{ "pa_mainloop_new",
128	(void **)&SDL_NAME(pa_mainloop_new) },
129	{ "pa_mainloop_get_api",
130	(void **)&SDL_NAME(pa_mainloop_get_api) },
131	{ "pa_mainloop_iterate",
132	(void **)&SDL_NAME(pa_mainloop_iterate) },
133	{ "pa_mainloop_free",
134	(void **)&SDL_NAME(pa_mainloop_free) },
135	{ "pa_operation_get_state",
136	(void **)&SDL_NAME(pa_operation_get_state) },
137	{ "pa_operation_cancel",
138	(void **)&SDL_NAME(pa_operation_cancel) },
139	{ "pa_operation_unref",
140	(void **)&SDL_NAME(pa_operation_unref) },
141	{ "pa_context_new",
142	(void **)&SDL_NAME(pa_context_new) },
143	{ "pa_context_connect",
144	(void **)&SDL_NAME(pa_context_connect) },
145	{ "pa_context_get_state",
146	(void **)&SDL_NAME(pa_context_get_state) },
147	{ "pa_context_disconnect",
148	(void **)&SDL_NAME(pa_context_disconnect) },
149	{ "pa_context_unref",
150	(void **)&SDL_NAME(pa_context_unref) },
151	{ "pa_stream_new",
152	(void **)&SDL_NAME(pa_stream_new) },
153	{ "pa_stream_connect_playback",
154	(void **)&SDL_NAME(pa_stream_connect_playback) },
155	{ "pa_stream_get_state",
156	(void **)&SDL_NAME(pa_stream_get_state) },
157	{ "pa_stream_writable_size",
158	(void **)&SDL_NAME(pa_stream_writable_size) },
159	{ "pa_stream_write",
160	(void **)&SDL_NAME(pa_stream_write) },
161	{ "pa_stream_drain",
162	(void **)&SDL_NAME(pa_stream_drain) },
163	{ "pa_stream_disconnect",
164	(void **)&SDL_NAME(pa_stream_disconnect) },
165	{ "pa_stream_unref",
166	(void **)&SDL_NAME(pa_stream_unref) },
167	};
168
169	static void UnloadPulseLibrary()
170	{
171	if ( pulse_loaded ) {
172	SDL_UnloadObject(pulse_handle);
173	pulse_handle = NULL;
174	pulse_loaded = 0;
175	}
176	}
177
178	static int LoadPulseLibrary(void)
179	{
180	int i, retval = -1;
181
182	pulse_handle = SDL_LoadObject(pulse_library);
183	if ( pulse_handle ) {
184	pulse_loaded = 1;
185	retval = 0;
186	for ( i=0; i<SDL_arraysize(pulse_functions); ++i ) {
187	*pulse_functions[i].func = SDL_LoadFunction(pulse_handle, pulse_functions[i].name);
188	if ( !*pulse_functions[i].func ) {
189	retval = -1;
190	UnloadPulseLibrary();
191	break;
192	}
193	}
194	}
195	return retval;
196	}
197
198	#else
199
200	static void UnloadPulseLibrary()
201	{
202	return;
203	}
204
205	static int LoadPulseLibrary(void)
206	{
207	return 0;
208	}
209
210	#endif /* SDL_AUDIO_DRIVER_PULSE_DYNAMIC */
211
212	/* Audio driver bootstrap functions */
213
214	static int Audio_Available(void)
215	{
216	pa_sample_spec paspec;
217	pa_simple *connection;
218	int available;
219
220	available = 0;
221	if ( LoadPulseLibrary() < 0 ) {
222	return available;
223	}
224
225	/* Connect with a dummy format. */
226	paspec.format = PA_SAMPLE_U8;
227	paspec.rate = 11025;
228	paspec.channels = 1;
229	connection = SDL_NAME(pa_simple_new)(
230	NULL, /* server */
231	"Test stream", /* application name */
232	PA_STREAM_PLAYBACK, /* playback mode */
233	NULL, /* device on the server */
234	"Simple DirectMedia Layer", /* stream description */
235	&paspec, /* sample format spec */
236	NULL, /* channel map */
237	NULL, /* buffering attributes */
238	NULL /* error code */
239	);
240	if ( connection != NULL ) {
241	available = 1;
242	SDL_NAME(pa_simple_free)(connection);
243	}
244
245	UnloadPulseLibrary();
246	return(available);
247	}
248
249	static void Audio_DeleteDevice(SDL_AudioDevice *device)
250	{
251	SDL_free(device->hidden);
252	SDL_free(device);
253	UnloadPulseLibrary();
254	}
255
256	static SDL_AudioDevice *Audio_CreateDevice(int devindex)
257	{
258	SDL_AudioDevice *this;
259
260	/* Initialize all variables that we clean on shutdown */
261	LoadPulseLibrary();
262	this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice));
263	if ( this ) {
264	SDL_memset(this, 0, (sizeof *this));
265	this->hidden = (struct SDL_PrivateAudioData *)
266	SDL_malloc((sizeof *this->hidden));
267	}
268	if ( (this == NULL) \|\| (this->hidden == NULL) ) {
269	SDL_OutOfMemory();
270	if ( this ) {
271	SDL_free(this);
272	}
273	return(0);
274	}
275	SDL_memset(this->hidden, 0, (sizeof *this->hidden));
276
277	/* Set the function pointers */
278	this->OpenAudio = PULSE_OpenAudio;
279	this->WaitAudio = PULSE_WaitAudio;
280	this->PlayAudio = PULSE_PlayAudio;
281	this->GetAudioBuf = PULSE_GetAudioBuf;
282	this->CloseAudio = PULSE_CloseAudio;
283	this->WaitDone = PULSE_WaitDone;
284
285	this->free = Audio_DeleteDevice;
286
287	return this;
288	}
289
290	AudioBootStrap PULSE_bootstrap = {
291	PULSE_DRIVER_NAME, "PulseAudio",
292	Audio_Available, Audio_CreateDevice
293	};
294
295	/* This function waits until it is possible to write a full sound buffer */
296	static void PULSE_WaitAudio(_THIS)
297	{
298	int size;
299	while(1) {
300	if (SDL_NAME(pa_context_get_state)(context) != PA_CONTEXT_READY \|\|
301	SDL_NAME(pa_stream_get_state)(stream) != PA_STREAM_READY \|\|
302	SDL_NAME(pa_mainloop_iterate)(mainloop, 1, NULL) < 0) {
303	this->enabled = 0;
304	return;
305	}
306	size = SDL_NAME(pa_stream_writable_size)(stream);
307	if (size >= mixlen)
308	return;
309	}
310	}
311
312	static void PULSE_PlayAudio(_THIS)
313	{
314	/* Write the audio data */
315	if (SDL_NAME(pa_stream_write)(stream, mixbuf, mixlen, NULL, 0LL, PA_SEEK_RELATIVE) < 0)
316	this->enabled = 0;
317	}
318
319	static Uint8 *PULSE_GetAudioBuf(_THIS)
320	{
321	return(mixbuf);
322	}
323
324	static void PULSE_CloseAudio(_THIS)
325	{
326	if ( mixbuf != NULL ) {
327	SDL_FreeAudioMem(mixbuf);
328	mixbuf = NULL;
329	}
330	if ( stream != NULL ) {
331	SDL_NAME(pa_stream_disconnect)(stream);
332	SDL_NAME(pa_stream_unref)(stream);
333	stream = NULL;
334	}
335	if (context != NULL) {
336	SDL_NAME(pa_context_disconnect)(context);
337	SDL_NAME(pa_context_unref)(context);
338	context = NULL;
339	}
340	if (mainloop != NULL) {
341	SDL_NAME(pa_mainloop_free)(mainloop);
342	mainloop = NULL;
343	}
344	}
345
346	/* Try to get the name of the program */
347	static char *get_progname(void)
348	{
349	#ifdef __LINUX__
350	char *progname = NULL;
351	FILE *fp;
352	static char temp[BUFSIZ];
353
354	SDL_snprintf(temp, SDL_arraysize(temp), "/proc/%d/cmdline", getpid());
355	fp = fopen(temp, "r");
356	if ( fp != NULL ) {
357	if ( fgets(temp, sizeof(temp)-1, fp) ) {
358	progname = SDL_strrchr(temp, '/');
359	if ( progname == NULL ) {
360	progname = temp;
361	} else {
362	progname = progname+1;
363	}
364	}
365	fclose(fp);
366	}
367	return(progname);
368	#elif defined(__NetBSD__)
369	return getprogname();
370	#else
371	return("unknown");
372	#endif
373	}
374
375	static void stream_drain_complete(pa_stream s, int success, void userdata) {
376	}
377
378	static void PULSE_WaitDone(_THIS)
379	{
380	pa_operation *o;
381
382	o = SDL_NAME(pa_stream_drain)(stream, stream_drain_complete, NULL);
383	if (!o)
384	return;
385
386	while (SDL_NAME(pa_operation_get_state)(o) != PA_OPERATION_DONE) {
387	if (SDL_NAME(pa_context_get_state)(context) != PA_CONTEXT_READY \|\|
388	SDL_NAME(pa_stream_get_state)(stream) != PA_STREAM_READY \|\|
389	SDL_NAME(pa_mainloop_iterate)(mainloop, 1, NULL) < 0) {
390	SDL_NAME(pa_operation_cancel)(o);
391	break;
392	}
393	}
394	SDL_NAME(pa_operation_unref)(o);
395	}
396
397	static int PULSE_OpenAudio(_THIS, SDL_AudioSpec *spec)
398	{
399	int state;
400	Uint16 test_format;
401	pa_sample_spec paspec;
402	pa_buffer_attr paattr;
403	pa_channel_map pacmap;
404	pa_stream_flags_t flags = 0;
405
406	paspec.format = PA_SAMPLE_INVALID;
407	for ( test_format = SDL_FirstAudioFormat(spec->format); test_format; ) {
408	switch ( test_format ) {
409	case AUDIO_U8:
410	paspec.format = PA_SAMPLE_U8;
411	break;
412	case AUDIO_S16LSB:
413	paspec.format = PA_SAMPLE_S16LE;
414	break;
415	case AUDIO_S16MSB:
416	paspec.format = PA_SAMPLE_S16BE;
417	break;
418	}
419	if ( paspec.format != PA_SAMPLE_INVALID )
420	break;
421	}
422	if (paspec.format == PA_SAMPLE_INVALID ) {
423	SDL_SetError("Couldn't find any suitable audio formats");
424	return(-1);
425	}
426	spec->format = test_format;
427
428	paspec.channels = spec->channels;
429	paspec.rate = spec->freq;
430
431	/* Calculate the final parameters for this audio specification */
432	#ifdef PA_STREAM_ADJUST_LATENCY
433	spec->samples /= 2; /* Mix in smaller chunck to avoid underruns */
434	#endif
435	SDL_CalculateAudioSpec(spec);
436
437	/* Allocate mixing buffer */
438	mixlen = spec->size;
439	mixbuf = (Uint8 *)SDL_AllocAudioMem(mixlen);
440	if ( mixbuf == NULL ) {
441	return(-1);
442	}
443	SDL_memset(mixbuf, spec->silence, spec->size);
444
445	/* Reduced prebuffering compared to the defaults. */
446	#ifdef PA_STREAM_ADJUST_LATENCY
447	paattr.tlength = mixlen * 4; /* 2x original requested bufsize */
448	paattr.prebuf = -1;
449	paattr.maxlength = -1;
450	paattr.minreq = mixlen; /* -1 can lead to pa_stream_writable_size()
451	>= mixlen never becoming true */
452	flags = PA_STREAM_ADJUST_LATENCY;
453	#else
454	paattr.tlength = mixlen*2;
455	paattr.prebuf = mixlen*2;
456	paattr.maxlength = mixlen*2;
457	paattr.minreq = mixlen;
458	#endif
459
460	/* The SDL ALSA output hints us that we use Windows' channel mapping */
461	/* http://bugzilla.libsdl.org/show_bug.cgi?id=110 */
462	SDL_NAME(pa_channel_map_init_auto)(
463	&pacmap, spec->channels, PA_CHANNEL_MAP_WAVEEX);
464
465	/* Set up a new main loop */
466	if (!(mainloop = SDL_NAME(pa_mainloop_new)())) {
467	PULSE_CloseAudio(this);
468	SDL_SetError("pa_mainloop_new() failed");
469	return(-1);
470	}
471
472	mainloop_api = SDL_NAME(pa_mainloop_get_api)(mainloop);
473	if (!(context = SDL_NAME(pa_context_new)(mainloop_api, get_progname()))) {
474	PULSE_CloseAudio(this);
475	SDL_SetError("pa_context_new() failed");
476	return(-1);
477	}
478
479	/* Connect to the PulseAudio server */
480	if (SDL_NAME(pa_context_connect)(context, NULL, 0, NULL) < 0) {
481	PULSE_CloseAudio(this);
482	SDL_SetError("Could not setup connection to PulseAudio");
483	return(-1);
484	}
485
486	do {
487	if (SDL_NAME(pa_mainloop_iterate)(mainloop, 1, NULL) < 0) {
488	PULSE_CloseAudio(this);
489	SDL_SetError("pa_mainloop_iterate() failed");
490	return(-1);
491	}
492	state = SDL_NAME(pa_context_get_state)(context);
493	if (!PA_CONTEXT_IS_GOOD(state)) {
494	PULSE_CloseAudio(this);
495	SDL_SetError("Could not connect to PulseAudio");
496	return(-1);
497	}
498	} while (state != PA_CONTEXT_READY);
499
500	stream = SDL_NAME(pa_stream_new)(
501	context,
502	"Simple DirectMedia Layer", /* stream description */
503	&paspec, /* sample format spec */
504	&pacmap /* channel map */
505	);
506	if ( stream == NULL ) {
507	PULSE_CloseAudio(this);
508	SDL_SetError("Could not setup PulseAudio stream");
509	return(-1);
510	}
511
512	if (SDL_NAME(pa_stream_connect_playback)(stream, NULL, &paattr, flags,
513	NULL, NULL) < 0) {
514	PULSE_CloseAudio(this);
515	SDL_SetError("Could not connect PulseAudio stream");
516	return(-1);
517	}
518
519	do {
520	if (SDL_NAME(pa_mainloop_iterate)(mainloop, 1, NULL) < 0) {
521	PULSE_CloseAudio(this);
522	SDL_SetError("pa_mainloop_iterate() failed");
523	return(-1);
524	}
525	state = SDL_NAME(pa_stream_get_state)(stream);
526	if (!PA_STREAM_IS_GOOD(state)) {
527	PULSE_CloseAudio(this);
528	SDL_SetError("Could not create to PulseAudio stream");
529	return(-1);
530	}
531	} while (state != PA_STREAM_READY);
532
533	return(0);
534	}