rdesktop/trunk/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	/* -- c-basic-offset: 8 --
2	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	Copyright (C) Michael Gernoth mike@zerfleddert.de 2005-2006
7
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	#include "rdpsnd.h"
25	#include "rdpsnd_dsp.h"
26	#include <unistd.h>
27	#include <fcntl.h>
28	#include <errno.h>
29	#include <ao/ao.h>
30	#include <sys/time.h>
31
32	#define WAVEOUTLEN 16
33
34	static ao_device *o_device = NULL;
35	static int default_driver;
36	static BOOL reopened;
37	static char *libao_device = NULL;
38
39	void libao_play(void);
40
41	void
42	libao_add_fds(int n, fd_set rfds, fd_set * wfds, struct timeval *tv)
43	{
44	/* We need to be called rather often... */
45	FD_SET(0, wfds);
46	}
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	BOOL
59	libao_open(void)
60	{
61	ao_sample_format format;
62
63	ao_initialize();
64
65	if (libao_device)
66	{
67	default_driver = ao_driver_id(libao_device);
68	}
69	else
70	{
71	default_driver = ao_default_driver_id();
72	}
73
74	format.bits = 16;
75	format.channels = 2;
76	format.rate = 44100;
77	format.byte_format = AO_FMT_NATIVE;
78
79
80	o_device = ao_open_live(default_driver, &format, NULL);
81	if (o_device == NULL)
82	{
83	return False;
84	}
85
86	reopened = True;
87
88	return True;
89	}
90
91	void
92	libao_close(void)
93	{
94	/* Ack all remaining packets */
95	while (!rdpsnd_queue_empty())
96	{
97	rdpsnd_queue_next(0);
98	}
99
100	if (o_device != NULL)
101	ao_close(o_device);
102
103	o_device = NULL;
104
105	ao_shutdown();
106	}
107
108	BOOL
109	libao_set_format(RD_WAVEFORMATEX * pwfx)
110	{
111	ao_sample_format format;
112
113	format.bits = pwfx->wBitsPerSample;
114	format.channels = pwfx->nChannels;
115	format.rate = 44100;
116	format.byte_format = AO_FMT_NATIVE;
117
118	if (o_device != NULL)
119	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	if (rdpsnd_dsp_resample_set(44100, pwfx->wBitsPerSample, pwfx->nChannels) == False)
128	{
129	return False;
130	}
131
132	reopened = True;
133
134	return True;
135	}
136
137	void
138	libao_play(void)
139	{
140	struct audio_packet *packet;
141	STREAM out;
142	int len;
143	static long prev_s, prev_us;
144	unsigned int duration;
145	struct timeval tv;
146	int next_tick;
147
148	if (reopened)
149	{
150	reopened = False;
151	gettimeofday(&tv, NULL);
152	prev_s = tv.tv_sec;
153	prev_us = tv.tv_usec;
154	}
155
156	/* We shouldn't be called if the queue is empty, but still */
157	if (rdpsnd_queue_empty())
158	return;
159
160	packet = rdpsnd_queue_current_packet();
161	out = &packet->s;
162
163	next_tick = rdpsnd_queue_next_tick();
164
165	len = (WAVEOUTLEN > (out->end - out->p)) ? (out->end - out->p) : WAVEOUTLEN;
166	ao_play(o_device, (char *) out->p, len);
167	out->p += len;
168
169	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	{
178	unsigned int delay_us;
179
180	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	delay_us = ((out->size / 4) * (1000000 / 44100));
191
192	rdpsnd_queue_next(delay_us);
193	}
194	}
195
196	struct audio_driver *
197	libao_register(char *options)
198	{
199	static struct audio_driver libao_driver;
200
201	memset(&libao_driver, 0, sizeof(libao_driver));
202
203	libao_driver.name = "libao";
204	libao_driver.description = "libao output driver, default device: system dependent";
205
206	libao_driver.add_fds = libao_add_fds;
207	libao_driver.check_fds = libao_check_fds;
208
209	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
215	libao_driver.need_byteswap_on_be = 1;
216	libao_driver.need_resampling = 1;
217
218	if (options)
219	{
220	libao_device = xstrdup(options);
221	}
222
223	return &libao_driver;
224	}