trunk/rdesktop/rdpsnd_oss.c

/* 
   rdesktop: A Remote Desktop Protocol client.
   Sound Channel Process Functions - Open Sound System
   Copyright (C) Matthew Chapman 2003
   Copyright (C) GuoJunBo guojunbo@ict.ac.cn 2003

   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 <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <sys/soundcard.h>

#define MAX_QUEUE       10

int g_dsp_fd;
BOOL g_dsp_busy;

static struct audio_packet {
        struct stream s;
        uint16 tick;
        uint8 index;
} packet_queue[MAX_QUEUE];
static unsigned int queue_hi, queue_lo;

BOOL
wave_out_open(void)
{
        char *dsp_dev = "/dev/dsp";

        if ((g_dsp_fd = open(dsp_dev, O_WRONLY)) == -1)
        {
                perror(dsp_dev);
                return False;
        }

        /* Non-blocking so that user interface is responsive */
        fcntl(g_dsp_fd, F_SETFL, fcntl(g_dsp_fd, F_GETFL)|O_NONBLOCK);
        return True;
}

void
wave_out_close(void)
{
        close(g_dsp_fd);
}

BOOL
wave_out_format_supported(WAVEFORMATEX *pwfx)
{
        if (pwfx->wFormatTag != WAVE_FORMAT_PCM)
                return False;
        if ((pwfx->nChannels != 1) && (pwfx->nChannels != 2))
                return False;
        if ((pwfx->wBitsPerSample != 8) && (pwfx->wBitsPerSample != 16))
                return False;

        return True;
}

BOOL
wave_out_set_format(WAVEFORMATEX *pwfx)
{
        int speed, channels, format;

        ioctl(g_dsp_fd, SNDCTL_DSP_RESET, NULL);
        ioctl(g_dsp_fd, SNDCTL_DSP_SYNC, NULL);

        if (pwfx->wBitsPerSample == 8)
                format = AFMT_U8;
        else if (pwfx->wBitsPerSample == 16)
                format = AFMT_S16_LE;

        if (ioctl(g_dsp_fd, SNDCTL_DSP_SETFMT, &format) == -1)
        {
                perror("SNDCTL_DSP_SETFMT");
                close(g_dsp_fd);
                return False;
        }

        channels = pwfx->nChannels;
        if (ioctl(g_dsp_fd, SNDCTL_DSP_CHANNELS, &channels) == -1)
        {
                perror("SNDCTL_DSP_CHANNELS");
                close(g_dsp_fd);
                return False;
        }

        speed = pwfx->nSamplesPerSec;
        if (ioctl(g_dsp_fd, SNDCTL_DSP_SPEED, &speed) == -1)
        {
                perror("SNDCTL_DSP_SPEED");
                close(g_dsp_fd);
                return False;
        }

        return True;
}

void
wave_out_write(STREAM s, uint16 tick, uint8 index)
{
        struct audio_packet *packet = &packet_queue[queue_hi];
        unsigned int next_hi = (queue_hi + 1) % MAX_QUEUE;

        if (next_hi == queue_lo)
        {
                error("No space to queue audio packet\n");
                return;
        }

        queue_hi = next_hi;

        packet->s = *s;
        packet->tick = tick;
        packet->index = index;

        /* we steal the data buffer from s, give it a new one */
        s->data = malloc(s->size);

        if (!g_dsp_busy)
                wave_out_play();
}

void
wave_out_play(void)
{
        struct audio_packet *packet;
        ssize_t len;
        STREAM out;

        while (1)
        {
                if (queue_lo == queue_hi)
                {
                        g_dsp_busy = 0;
                        return;
                }

                packet = &packet_queue[queue_lo];
                out = &packet->s;

                len = write(g_dsp_fd, out->p, out->end-out->p);
                if (len == -1)
                {
                        if (errno != EWOULDBLOCK)
                                perror("write audio");
                        g_dsp_busy = 1;
                        return;
                }

                out->p += len;
                if (out->p == out->end)
                {
                        rdpsnd_send_completion(packet->tick, packet->index);
                        free(out->data);
                        queue_lo = (queue_lo + 1) % MAX_QUEUE;
                }
        }

}
1	/*
2	rdesktop: A Remote Desktop Protocol client.
3	Sound Channel Process Functions - Open Sound System
4	Copyright (C) Matthew Chapman 2003
5	Copyright (C) GuoJunBo guojunbo@ict.ac.cn 2003
6
7	This program is free software; you can redistribute it and/or modify
8	it under the terms of the GNU General Public License as published by
9	the Free Software Foundation; either version 2 of the License, or
10	(at your option) any later version.
11
12	This program is distributed in the hope that it will be useful,
13	but WITHOUT ANY WARRANTY; without even the implied warranty of
14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15	GNU General Public License for more details.
16
17	You should have received a copy of the GNU General Public License
18	along with this program; if not, write to the Free Software
19	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20	*/
21
22	#include "rdesktop.h"
23	#include <unistd.h>
24	#include <fcntl.h>
25	#include <errno.h>
26	#include <sys/ioctl.h>
27	#include <sys/soundcard.h>
28
29	#define MAX_QUEUE 10
30
31	int g_dsp_fd;
32	BOOL g_dsp_busy;
33
34	static struct audio_packet {
35	struct stream s;
36	uint16 tick;
37	uint8 index;
38	} packet_queue[MAX_QUEUE];
39	static unsigned int queue_hi, queue_lo;
40
41	BOOL
42	wave_out_open(void)
43	{
44	char *dsp_dev = "/dev/dsp";
45
46	if ((g_dsp_fd = open(dsp_dev, O_WRONLY)) == -1)
47	{
48	perror(dsp_dev);
49	return False;
50	}
51
52	/* Non-blocking so that user interface is responsive */
53	fcntl(g_dsp_fd, F_SETFL, fcntl(g_dsp_fd, F_GETFL)\|O_NONBLOCK);
54	return True;
55	}
56
57	void
58	wave_out_close(void)
59	{
60	close(g_dsp_fd);
61	}
62
63	BOOL
64	wave_out_format_supported(WAVEFORMATEX *pwfx)
65	{
66	if (pwfx->wFormatTag != WAVE_FORMAT_PCM)
67	return False;
68	if ((pwfx->nChannels != 1) && (pwfx->nChannels != 2))
69	return False;
70	if ((pwfx->wBitsPerSample != 8) && (pwfx->wBitsPerSample != 16))
71	return False;
72
73	return True;
74	}
75
76	BOOL
77	wave_out_set_format(WAVEFORMATEX *pwfx)
78	{
79	int speed, channels, format;
80
81	ioctl(g_dsp_fd, SNDCTL_DSP_RESET, NULL);
82	ioctl(g_dsp_fd, SNDCTL_DSP_SYNC, NULL);
83
84	if (pwfx->wBitsPerSample == 8)
85	format = AFMT_U8;
86	else if (pwfx->wBitsPerSample == 16)
87	format = AFMT_S16_LE;
88
89	if (ioctl(g_dsp_fd, SNDCTL_DSP_SETFMT, &format) == -1)
90	{
91	perror("SNDCTL_DSP_SETFMT");
92	close(g_dsp_fd);
93	return False;
94	}
95
96	channels = pwfx->nChannels;
97	if (ioctl(g_dsp_fd, SNDCTL_DSP_CHANNELS, &channels) == -1)
98	{
99	perror("SNDCTL_DSP_CHANNELS");
100	close(g_dsp_fd);
101	return False;
102	}
103
104	speed = pwfx->nSamplesPerSec;
105	if (ioctl(g_dsp_fd, SNDCTL_DSP_SPEED, &speed) == -1)
106	{
107	perror("SNDCTL_DSP_SPEED");
108	close(g_dsp_fd);
109	return False;
110	}
111
112	return True;
113	}
114
115	void
116	wave_out_write(STREAM s, uint16 tick, uint8 index)
117	{
118	struct audio_packet *packet = &packet_queue[queue_hi];
119	unsigned int next_hi = (queue_hi + 1) % MAX_QUEUE;
120
121	if (next_hi == queue_lo)
122	{
123	error("No space to queue audio packet\n");
124	return;
125	}
126
127	queue_hi = next_hi;
128
129	packet->s = *s;
130	packet->tick = tick;
131	packet->index = index;
132
133	/* we steal the data buffer from s, give it a new one */
134	s->data = malloc(s->size);
135
136	if (!g_dsp_busy)
137	wave_out_play();
138	}
139
140	void
141	wave_out_play(void)
142	{
143	struct audio_packet *packet;
144	ssize_t len;
145	STREAM out;
146
147	while (1)
148	{
149	if (queue_lo == queue_hi)
150	{
151	g_dsp_busy = 0;
152	return;
153	}
154
155	packet = &packet_queue[queue_lo];
156	out = &packet->s;
157
158	len = write(g_dsp_fd, out->p, out->end-out->p);
159	if (len == -1)
160	{
161	if (errno != EWOULDBLOCK)
162	perror("write audio");
163	g_dsp_busy = 1;
164	return;
165	}
166
167	out->p += len;
168	if (out->p == out->end)
169	{
170	rdpsnd_send_completion(packet->tick, packet->index);
171	free(out->data);
172	queue_lo = (queue_lo + 1) % MAX_QUEUE;
173	}
174	}
175
176	}