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	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			}
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	stargo	833	BOOL
57	stargo	1255	libao_open(void)
58	stargo	833	{
59			ao_sample_format format;
60
61	stargo	1266	ao_initialize();
62
63			if (libao_device)
64	stargo	1255	{
65	stargo	1266	default_driver = ao_driver_id(libao_device);
66	stargo	1255	}
67	stargo	1266	else
68			{
69			default_driver = ao_default_driver_id();
70			}
71	stargo	1255
72	stargo	833	format.bits = 16;
73			format.channels = 2;
74			format.rate = 44100;
75	stargo	1289	format.byte_format = AO_FMT_NATIVE;
76	stargo	833
77	stargo	1289
78	stargo	833	o_device = ao_open_live(default_driver, &format, NULL);
79			if (o_device == NULL)
80			{
81			return False;
82			}
83
84	stargo	1245	reopened = True;
85	stargo	891
86	stargo	833	return True;
87			}
88
89			void
90	stargo	1255	libao_close(void)
91	stargo	833	{
92			/* Ack all remaining packets */
93	stargo	1254	while (!rdpsnd_queue_empty())
94	stargo	833	{
95	ossman_	1302	rdpsnd_queue_next(0);
96	stargo	833	}
97
98			if (o_device != NULL)
99			ao_close(o_device);
100	stargo	838
101	ossman_	1346	o_device = NULL;
102
103	stargo	833	ao_shutdown();
104			}
105
106			BOOL
107	stargo	1255	libao_set_format(WAVEFORMATEX * pwfx)
108	stargo	833	{
109			ao_sample_format format;
110
111			format.bits = pwfx->wBitsPerSample;
112			format.channels = pwfx->nChannels;
113			format.rate = 44100;
114	stargo	1289	format.byte_format = AO_FMT_NATIVE;
115	stargo	833
116	stargo	837	if (o_device != NULL)
117	stargo	833	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	stargo	1276	if (rdpsnd_dsp_resample_set(44100, pwfx->wBitsPerSample, pwfx->nChannels) == False)
126			{
127			return False;
128			}
129
130	stargo	1245	reopened = True;
131	stargo	833
132			return True;
133			}
134
135			void
136	stargo	1255	libao_play(void)
137	stargo	833	{
138			struct audio_packet *packet;
139			STREAM out;
140	stargo	1276	int len;
141	stargo	891	static long prev_s, prev_us;
142			unsigned int duration;
143			struct timeval tv;
144			int next_tick;
145	stargo	833
146	stargo	1245	if (reopened)
147	stargo	891	{
148	stargo	1245	reopened = False;
149	stargo	891	gettimeofday(&tv, NULL);
150			prev_s = tv.tv_sec;
151			prev_us = tv.tv_usec;
152			}
153
154	ossman_	1346	/* We shouldn't be called if the queue is empty, but still */
155	stargo	1254	if (rdpsnd_queue_empty())
156	stargo	835	return;
157	stargo	833
158	stargo	1254	packet = rdpsnd_queue_current_packet();
159	stargo	835	out = &packet->s;
160	stargo	833
161	stargo	1254	next_tick = rdpsnd_queue_next_tick();
162	stargo	891
163	stargo	1290	len = (WAVEOUTLEN > (out->end - out->p)) ? (out->end - out->p) : WAVEOUTLEN;
164	stargo	1276	ao_play(o_device, (char *) out->p, len);
165			out->p += len;
166	stargo	833
167	stargo	891	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	stargo	835	{
176	stargo	891	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	ossman_	1302	rdpsnd_queue_next(duration);
187	stargo	835	}
188	stargo	833	}
189	stargo	1255
190	ossman_	1345	static struct audio_driver libao_driver = {
191			.name = "libao",
192			.description = "libao output driver, default device: system dependent",
193
194	ossman_	1346	.add_fds = libao_add_fds,
195			.check_fds = libao_check_fds,
196
197	ossman_	1345	.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	stargo	1255	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			}