trunk/rdesktop/rdpsnd_libao.c

/* -*- c-basic-offset: 8 -*-
   rdesktop: A Remote Desktop Protocol client.
   Sound Channel Process Functions - libao-driver
   Copyright (C) Matthew Chapman 2003
   Copyright (C) GuoJunBo guojunbo@ict.ac.cn 2003
   Copyright (C) Michael Gernoth mike@zerfleddert.de 2005-2006

   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 2 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, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include "rdesktop.h"
#include "rdpsnd.h"
#include "rdpsnd_dsp.h"
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <ao/ao.h>
#include <sys/time.h>

#define WAVEOUTLEN      16

static ao_device *o_device = NULL;
static int default_driver;
static BOOL reopened;
static char *libao_device = NULL;

void libao_play(void);

void
libao_add_fds(int *n, fd_set * rfds, fd_set * wfds, struct timeval *tv)
{
        /* We need to be called rather often... */
        FD_SET(0, wfds);
}

void
libao_check_fds(fd_set * rfds, fd_set * wfds)
{
        if (o_device == NULL)
                return;

        if (!rdpsnd_queue_empty())
                libao_play();
}

BOOL
libao_open(void)
{
        ao_sample_format format;

        ao_initialize();

        if (libao_device)
        {
                default_driver = ao_driver_id(libao_device);
        }
        else
        {
                default_driver = ao_default_driver_id();
        }

        format.bits = 16;
        format.channels = 2;
        format.rate = 44100;
        format.byte_format = AO_FMT_NATIVE;


        o_device = ao_open_live(default_driver, &format, NULL);
        if (o_device == NULL)
        {
                return False;
        }

        reopened = True;

        return True;
}

void
libao_close(void)
{
        /* Ack all remaining packets */
        while (!rdpsnd_queue_empty())
        {
                rdpsnd_queue_next(0);
        }

        if (o_device != NULL)
                ao_close(o_device);

        o_device = NULL;

        ao_shutdown();
}

BOOL
libao_set_format(RD_WAVEFORMATEX * pwfx)
{
        ao_sample_format format;

        format.bits = pwfx->wBitsPerSample;
        format.channels = pwfx->nChannels;
        format.rate = 44100;
        format.byte_format = AO_FMT_NATIVE;

        if (o_device != NULL)
                ao_close(o_device);

        o_device = ao_open_live(default_driver, &format, NULL);
        if (o_device == NULL)
        {
                return False;
        }

        if (rdpsnd_dsp_resample_set(44100, pwfx->wBitsPerSample, pwfx->nChannels) == False)
        {
                return False;
        }

        reopened = True;

        return True;
}

void
libao_play(void)
{
        struct audio_packet *packet;
        STREAM out;
        int len;
        static long prev_s, prev_us;
        unsigned int duration;
        struct timeval tv;
        int next_tick;

        if (reopened)
        {
                reopened = False;
                gettimeofday(&tv, NULL);
                prev_s = tv.tv_sec;
                prev_us = tv.tv_usec;
        }

        /* We shouldn't be called if the queue is empty, but still */
        if (rdpsnd_queue_empty())
                return;

        packet = rdpsnd_queue_current_packet();
        out = &packet->s;

        next_tick = rdpsnd_queue_next_tick();

        len = (WAVEOUTLEN > (out->end - out->p)) ? (out->end - out->p) : WAVEOUTLEN;
        ao_play(o_device, (char *) out->p, len);
        out->p += len;

        gettimeofday(&tv, NULL);

        duration = ((tv.tv_sec - prev_s) * 1000000 + (tv.tv_usec - prev_us)) / 1000;

        if (packet->tick > next_tick)
                next_tick += 65536;

        if ((out->p == out->end) || duration > next_tick - packet->tick + 500)
        {
                unsigned int delay_us;

                prev_s = tv.tv_sec;
                prev_us = tv.tv_usec;

                if (abs((next_tick - packet->tick) - duration) > 20)
                {
                        DEBUG(("duration: %d, calc: %d, ", duration, next_tick - packet->tick));
                        DEBUG(("last: %d, is: %d, should: %d\n", packet->tick,
                               (packet->tick + duration) % 65536, next_tick % 65536));
                }

                delay_us = ((out->size / 4) * (1000000 / 44100));

                rdpsnd_queue_next(delay_us);
        }
}

struct audio_driver *
libao_register(char *options)
{
        static struct audio_driver libao_driver;

        memset(&libao_driver, 0, sizeof(libao_driver));

        libao_driver.name = "libao";
        libao_driver.description = "libao output driver, default device: system dependent";

        libao_driver.add_fds = libao_add_fds;
        libao_driver.check_fds = libao_check_fds;

        libao_driver.wave_out_open = libao_open;
        libao_driver.wave_out_close = libao_close;
        libao_driver.wave_out_format_supported = rdpsnd_dsp_resample_supported;
        libao_driver.wave_out_set_format = libao_set_format;
        libao_driver.wave_out_volume = rdpsnd_dsp_softvol_set;

        libao_driver.need_byteswap_on_be = 1;
        libao_driver.need_resampling = 1;

        if (options)
        {
                libao_device = xstrdup(options);
        }

        return &libao_driver;
}
1	astrand	963	/* -- c-basic-offset: 8 --
2	stargo	833	rdesktop: A Remote Desktop Protocol client.
3			Sound Channel Process Functions - libao-driver
4			Copyright (C) Matthew Chapman 2003
5			Copyright (C) GuoJunBo guojunbo@ict.ac.cn 2003
6	stargo	1254	Copyright (C) Michael Gernoth mike@zerfleddert.de 2005-2006
7	stargo	833
8			This program is free software; you can redistribute it and/or modify
9			it under the terms of the GNU General Public License as published by
10			the Free Software Foundation; either version 2 of the License, or
11			(at your option) any later version.
12
13			This program is distributed in the hope that it will be useful,
14			but WITHOUT ANY WARRANTY; without even the implied warranty of
15			MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16			GNU General Public License for more details.
17
18			You should have received a copy of the GNU General Public License
19			along with this program; if not, write to the Free Software
20			Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21			*/
22
23			#include "rdesktop.h"
24	stargo	1254	#include "rdpsnd.h"
25	stargo	1258	#include "rdpsnd_dsp.h"
26	stargo	833	#include <unistd.h>
27			#include <fcntl.h>
28			#include <errno.h>
29			#include <ao/ao.h>
30	stargo	891	#include <sys/time.h>
31	stargo	833
32	stargo	1295	#define WAVEOUTLEN 16
33	stargo	833
34	stargo	1245	static ao_device *o_device = NULL;
35			static int default_driver;
36			static BOOL reopened;
37	stargo	1255	static char *libao_device = NULL;
38	stargo	833
39	ossman_	1346	void libao_play(void);
40
41			void
42			libao_add_fds(int n, fd_set rfds, fd_set * wfds, struct timeval *tv)
43			{
44	stargo	1352	/* We need to be called rather often... */
45			FD_SET(0, wfds);
46	ossman_	1346	}
47
48			void
49			libao_check_fds(fd_set * rfds, fd_set * wfds)
50			{
51			if (o_device == NULL)
52			return;
53
54			if (!rdpsnd_queue_empty())
55			libao_play();
56			}
57
58	stargo	833	BOOL
59	stargo	1255	libao_open(void)
60	stargo	833	{
61			ao_sample_format format;
62
63	stargo	1266	ao_initialize();
64
65			if (libao_device)
66	stargo	1255	{
67	stargo	1266	default_driver = ao_driver_id(libao_device);
68	stargo	1255	}
69	stargo	1266	else
70			{
71			default_driver = ao_default_driver_id();
72			}
73	stargo	1255
74	stargo	833	format.bits = 16;
75			format.channels = 2;
76			format.rate = 44100;
77	stargo	1289	format.byte_format = AO_FMT_NATIVE;
78	stargo	833
79	stargo	1289
80	stargo	833	o_device = ao_open_live(default_driver, &format, NULL);
81			if (o_device == NULL)
82			{
83			return False;
84			}
85
86	stargo	1245	reopened = True;
87	stargo	891
88	stargo	833	return True;
89			}
90
91			void
92	stargo	1255	libao_close(void)
93	stargo	833	{
94			/* Ack all remaining packets */
95	stargo	1254	while (!rdpsnd_queue_empty())
96	stargo	833	{
97	ossman_	1302	rdpsnd_queue_next(0);
98	stargo	833	}
99
100			if (o_device != NULL)
101			ao_close(o_device);
102	stargo	838
103	ossman_	1346	o_device = NULL;
104
105	stargo	833	ao_shutdown();
106			}
107
108			BOOL
109	jsorg71	1364	libao_set_format(RD_WAVEFORMATEX * pwfx)
110	stargo	833	{
111			ao_sample_format format;
112
113			format.bits = pwfx->wBitsPerSample;
114			format.channels = pwfx->nChannels;
115			format.rate = 44100;
116	stargo	1289	format.byte_format = AO_FMT_NATIVE;
117	stargo	833
118	stargo	837	if (o_device != NULL)
119	stargo	833	ao_close(o_device);
120
121			o_device = ao_open_live(default_driver, &format, NULL);
122			if (o_device == NULL)
123			{
124			return False;
125			}
126
127	stargo	1276	if (rdpsnd_dsp_resample_set(44100, pwfx->wBitsPerSample, pwfx->nChannels) == False)
128			{
129			return False;
130			}
131
132	stargo	1245	reopened = True;
133	stargo	833
134			return True;
135			}
136
137			void
138	stargo	1255	libao_play(void)
139	stargo	833	{
140			struct audio_packet *packet;
141			STREAM out;
142	stargo	1276	int len;
143	stargo	891	static long prev_s, prev_us;
144			unsigned int duration;
145			struct timeval tv;
146			int next_tick;
147	stargo	833
148	stargo	1245	if (reopened)
149	stargo	891	{
150	stargo	1245	reopened = False;
151	stargo	891	gettimeofday(&tv, NULL);
152			prev_s = tv.tv_sec;
153			prev_us = tv.tv_usec;
154			}
155
156	ossman_	1346	/* We shouldn't be called if the queue is empty, but still */
157	stargo	1254	if (rdpsnd_queue_empty())
158	stargo	835	return;
159	stargo	833
160	stargo	1254	packet = rdpsnd_queue_current_packet();
161	stargo	835	out = &packet->s;
162	stargo	833
163	stargo	1254	next_tick = rdpsnd_queue_next_tick();
164	stargo	891
165	stargo	1290	len = (WAVEOUTLEN > (out->end - out->p)) ? (out->end - out->p) : WAVEOUTLEN;
166	stargo	1276	ao_play(o_device, (char *) out->p, len);
167			out->p += len;
168	stargo	833
169	stargo	891	gettimeofday(&tv, NULL);
170
171			duration = ((tv.tv_sec - prev_s) * 1000000 + (tv.tv_usec - prev_us)) / 1000;
172
173			if (packet->tick > next_tick)
174			next_tick += 65536;
175
176			if ((out->p == out->end) \|\| duration > next_tick - packet->tick + 500)
177	stargo	835	{
178	stargo	1352	unsigned int delay_us;
179
180	stargo	891	prev_s = tv.tv_sec;
181			prev_us = tv.tv_usec;
182
183			if (abs((next_tick - packet->tick) - duration) > 20)
184			{
185			DEBUG(("duration: %d, calc: %d, ", duration, next_tick - packet->tick));
186			DEBUG(("last: %d, is: %d, should: %d\n", packet->tick,
187			(packet->tick + duration) % 65536, next_tick % 65536));
188			}
189
190	stargo	1354	delay_us = ((out->size / 4) * (1000000 / 44100));
191	stargo	1352
192			rdpsnd_queue_next(delay_us);
193	stargo	835	}
194	stargo	833	}
195	stargo	1255
196	stargo	1351	struct audio_driver *
197			libao_register(char *options)
198			{
199			static struct audio_driver libao_driver;
200	ossman_	1345
201	ossman_	1356	memset(&libao_driver, 0, sizeof(libao_driver));
202	ossman_	1346
203	ossman_	1356	libao_driver.name = "libao";
204			libao_driver.description = "libao output driver, default device: system dependent";
205
206	stargo	1351	libao_driver.add_fds = libao_add_fds;
207			libao_driver.check_fds = libao_check_fds;
208	ossman_	1345
209	stargo	1351	libao_driver.wave_out_open = libao_open;
210			libao_driver.wave_out_close = libao_close;
211			libao_driver.wave_out_format_supported = rdpsnd_dsp_resample_supported;
212			libao_driver.wave_out_set_format = libao_set_format;
213			libao_driver.wave_out_volume = rdpsnd_dsp_softvol_set;
214	ossman_	1345
215	stargo	1351	libao_driver.need_byteswap_on_be = 1;
216			libao_driver.need_resampling = 1;
217
218	stargo	1255	if (options)
219			{
220			libao_device = xstrdup(options);
221			}
222
223			return &libao_driver;
224			}