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)
{
}

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(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)
        {
                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));
                }

                rdpsnd_queue_next(duration);
        }
}

static struct audio_driver libao_driver = {
        .name = "libao",
        .description = "libao output driver, default device: system dependent",

        .add_fds = libao_add_fds,
        .check_fds = libao_check_fds,

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

        .need_byteswap_on_be = 1,
        .need_resampling = 1,
};

struct audio_driver *
libao_register(char *options)
{
        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	}
45
46	void
47	libao_check_fds(fd_set * rfds, fd_set * wfds)
48	{
49	if (o_device == NULL)
50	return;
51
52	if (!rdpsnd_queue_empty())
53	libao_play();
54	}
55
56	BOOL
57	libao_open(void)
58	{
59	ao_sample_format format;
60
61	ao_initialize();
62
63	if (libao_device)
64	{
65	default_driver = ao_driver_id(libao_device);
66	}
67	else
68	{
69	default_driver = ao_default_driver_id();
70	}
71
72	format.bits = 16;
73	format.channels = 2;
74	format.rate = 44100;
75	format.byte_format = AO_FMT_NATIVE;
76
77
78	o_device = ao_open_live(default_driver, &format, NULL);
79	if (o_device == NULL)
80	{
81	return False;
82	}
83
84	reopened = True;
85
86	return True;
87	}
88
89	void
90	libao_close(void)
91	{
92	/* Ack all remaining packets */
93	while (!rdpsnd_queue_empty())
94	{
95	rdpsnd_queue_next(0);
96	}
97
98	if (o_device != NULL)
99	ao_close(o_device);
100
101	o_device = NULL;
102
103	ao_shutdown();
104	}
105
106	BOOL
107	libao_set_format(WAVEFORMATEX * pwfx)
108	{
109	ao_sample_format format;
110
111	format.bits = pwfx->wBitsPerSample;
112	format.channels = pwfx->nChannels;
113	format.rate = 44100;
114	format.byte_format = AO_FMT_NATIVE;
115
116	if (o_device != NULL)
117	ao_close(o_device);
118
119	o_device = ao_open_live(default_driver, &format, NULL);
120	if (o_device == NULL)
121	{
122	return False;
123	}
124
125	if (rdpsnd_dsp_resample_set(44100, pwfx->wBitsPerSample, pwfx->nChannels) == False)
126	{
127	return False;
128	}
129
130	reopened = True;
131
132	return True;
133	}
134
135	void
136	libao_play(void)
137	{
138	struct audio_packet *packet;
139	STREAM out;
140	int len;
141	static long prev_s, prev_us;
142	unsigned int duration;
143	struct timeval tv;
144	int next_tick;
145
146	if (reopened)
147	{
148	reopened = False;
149	gettimeofday(&tv, NULL);
150	prev_s = tv.tv_sec;
151	prev_us = tv.tv_usec;
152	}
153
154	/* We shouldn't be called if the queue is empty, but still */
155	if (rdpsnd_queue_empty())
156	return;
157
158	packet = rdpsnd_queue_current_packet();
159	out = &packet->s;
160
161	next_tick = rdpsnd_queue_next_tick();
162
163	len = (WAVEOUTLEN > (out->end - out->p)) ? (out->end - out->p) : WAVEOUTLEN;
164	ao_play(o_device, (char *) out->p, len);
165	out->p += len;
166
167	gettimeofday(&tv, NULL);
168
169	duration = ((tv.tv_sec - prev_s) * 1000000 + (tv.tv_usec - prev_us)) / 1000;
170
171	if (packet->tick > next_tick)
172	next_tick += 65536;
173
174	if ((out->p == out->end) \|\| duration > next_tick - packet->tick + 500)
175	{
176	prev_s = tv.tv_sec;
177	prev_us = tv.tv_usec;
178
179	if (abs((next_tick - packet->tick) - duration) > 20)
180	{
181	DEBUG(("duration: %d, calc: %d, ", duration, next_tick - packet->tick));
182	DEBUG(("last: %d, is: %d, should: %d\n", packet->tick,
183	(packet->tick + duration) % 65536, next_tick % 65536));
184	}
185
186	rdpsnd_queue_next(duration);
187	}
188	}
189
190	static struct audio_driver libao_driver = {
191	.name = "libao",
192	.description = "libao output driver, default device: system dependent",
193
194	.add_fds = libao_add_fds,
195	.check_fds = libao_check_fds,
196
197	.wave_out_open = libao_open,
198	.wave_out_close = libao_close,
199	.wave_out_format_supported = rdpsnd_dsp_resample_supported,
200	.wave_out_set_format = libao_set_format,
201	.wave_out_volume = rdpsnd_dsp_softvol_set,
202
203	.need_byteswap_on_be = 1,
204	.need_resampling = 1,
205	};
206
207	struct audio_driver *
208	libao_register(char *options)
209	{
210	if (options)
211	{
212	libao_device = xstrdup(options);
213	}
214
215	return &libao_driver;
216	}