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      1024

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

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;
        }

        g_dsp_fd = 0;
        rdpsnd_queue_init();

        reopened = True;

        return True;
}

void
libao_close(void)
{
        /* Ack all remaining packets */
        while (!rdpsnd_queue_empty())
        {
                rdpsnd_send_completion(rdpsnd_queue_current_packet()->tick,
                                       rdpsnd_queue_current_packet()->index);
                rdpsnd_queue_next();
        }

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

        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;
        }

        if (rdpsnd_queue_empty())
        {
                g_dsp_busy = 0;
                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_send_completion(((packet->tick + duration) % 65536), packet->index);
                rdpsnd_queue_next();
        }

        g_dsp_busy = 1;
        return;
}

struct audio_driver *
libao_register(char *options)
{
        static struct audio_driver libao_driver;
        struct ao_info *libao_info;
        static char description[101];

        libao_driver.wave_out_write = rdpsnd_queue_write;
        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.wave_out_play = libao_play;
        libao_driver.name = xstrdup("libao");
        libao_driver.description = description;
        libao_driver.need_byteswap_on_be = 1;
        libao_driver.need_resampling = 1;
        libao_driver.next = NULL;

        ao_initialize();

        libao_info = ao_driver_info(ao_default_driver_id());

        if (libao_info)
        {
                snprintf(description, 100, "libao output driver, default device: %s",
                         libao_info->short_name);
        }
        else
        {
                snprintf(description, 100, "libao output driver, default device: none");
        }

        ao_shutdown();

        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 1024
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	BOOL
40	libao_open(void)
41	{
42	ao_sample_format format;
43
44	ao_initialize();
45
46	if (libao_device)
47	{
48	default_driver = ao_driver_id(libao_device);
49	}
50	else
51	{
52	default_driver = ao_default_driver_id();
53	}
54
55	format.bits = 16;
56	format.channels = 2;
57	format.rate = 44100;
58	format.byte_format = AO_FMT_NATIVE;
59
60
61	o_device = ao_open_live(default_driver, &format, NULL);
62	if (o_device == NULL)
63	{
64	return False;
65	}
66
67	g_dsp_fd = 0;
68	rdpsnd_queue_init();
69
70	reopened = True;
71
72	return True;
73	}
74
75	void
76	libao_close(void)
77	{
78	/* Ack all remaining packets */
79	while (!rdpsnd_queue_empty())
80	{
81	rdpsnd_send_completion(rdpsnd_queue_current_packet()->tick,
82	rdpsnd_queue_current_packet()->index);
83	rdpsnd_queue_next();
84	}
85
86	if (o_device != NULL)
87	ao_close(o_device);
88
89	ao_shutdown();
90	}
91
92	BOOL
93	libao_set_format(WAVEFORMATEX * pwfx)
94	{
95	ao_sample_format format;
96
97	format.bits = pwfx->wBitsPerSample;
98	format.channels = pwfx->nChannels;
99	format.rate = 44100;
100	format.byte_format = AO_FMT_NATIVE;
101
102	if (o_device != NULL)
103	ao_close(o_device);
104
105	o_device = ao_open_live(default_driver, &format, NULL);
106	if (o_device == NULL)
107	{
108	return False;
109	}
110
111	if (rdpsnd_dsp_resample_set(44100, pwfx->wBitsPerSample, pwfx->nChannels) == False)
112	{
113	return False;
114	}
115
116	reopened = True;
117
118	return True;
119	}
120
121	void
122	libao_play(void)
123	{
124	struct audio_packet *packet;
125	STREAM out;
126	int len;
127	static long prev_s, prev_us;
128	unsigned int duration;
129	struct timeval tv;
130	int next_tick;
131
132	if (reopened)
133	{
134	reopened = False;
135	gettimeofday(&tv, NULL);
136	prev_s = tv.tv_sec;
137	prev_us = tv.tv_usec;
138	}
139
140	if (rdpsnd_queue_empty())
141	{
142	g_dsp_busy = 0;
143	return;
144	}
145
146	packet = rdpsnd_queue_current_packet();
147	out = &packet->s;
148
149	next_tick = rdpsnd_queue_next_tick();
150
151	len = (WAVEOUTLEN > (out->end - out->p)) ? (out->end - out->p) : WAVEOUTLEN;
152	ao_play(o_device, (char *) out->p, len);
153	out->p += len;
154
155	gettimeofday(&tv, NULL);
156
157	duration = ((tv.tv_sec - prev_s) * 1000000 + (tv.tv_usec - prev_us)) / 1000;
158
159	if (packet->tick > next_tick)
160	next_tick += 65536;
161
162	if ((out->p == out->end) \|\| duration > next_tick - packet->tick + 500)
163	{
164	prev_s = tv.tv_sec;
165	prev_us = tv.tv_usec;
166
167	if (abs((next_tick - packet->tick) - duration) > 20)
168	{
169	DEBUG(("duration: %d, calc: %d, ", duration, next_tick - packet->tick));
170	DEBUG(("last: %d, is: %d, should: %d\n", packet->tick,
171	(packet->tick + duration) % 65536, next_tick % 65536));
172	}
173
174	rdpsnd_send_completion(((packet->tick + duration) % 65536), packet->index);
175	rdpsnd_queue_next();
176	}
177
178	g_dsp_busy = 1;
179	return;
180	}
181
182	struct audio_driver *
183	libao_register(char *options)
184	{
185	static struct audio_driver libao_driver;
186	struct ao_info *libao_info;
187	static char description[101];
188
189	libao_driver.wave_out_write = rdpsnd_queue_write;
190	libao_driver.wave_out_open = libao_open;
191	libao_driver.wave_out_close = libao_close;
192	libao_driver.wave_out_format_supported = rdpsnd_dsp_resample_supported;
193	libao_driver.wave_out_set_format = libao_set_format;
194	libao_driver.wave_out_volume = rdpsnd_dsp_softvol_set;
195	libao_driver.wave_out_play = libao_play;
196	libao_driver.name = xstrdup("libao");
197	libao_driver.description = description;
198	libao_driver.need_byteswap_on_be = 1;
199	libao_driver.need_resampling = 1;
200	libao_driver.next = NULL;
201
202	ao_initialize();
203
204	libao_info = ao_driver_info(ao_default_driver_id());
205
206	if (libao_info)
207	{
208	snprintf(description, 100, "libao output driver, default device: %s",
209	libao_info->short_name);
210	}
211	else
212	{
213	snprintf(description, 100, "libao output driver, default device: none");
214	}
215
216	ao_shutdown();
217
218	if (options)
219	{
220	libao_device = xstrdup(options);
221	}
222
223	return &libao_driver;
224	}