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 | O_NONBLOCK)) == -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_volume(uint16 left, uint16 right)
{
        uint32 volume;

        volume = left / (65536 / 100);
        volume |= right / (65536 / 100) << 8;
        if (ioctl(g_dsp_fd, MIXER_WRITE(SOUND_MIXER_PCM), &volume) == -1)
        {
                perror("MIXER_WRITE(SOUND_MIXER_PCM)");
                return;
        }
}

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;
        packet->s.p += 4;

        /* 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	matthewc	475	/*
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	astrand	499	static struct audio_packet
35			{
36	matthewc	475	struct stream s;
37			uint16 tick;
38			uint8 index;
39			} packet_queue[MAX_QUEUE];
40			static unsigned int queue_hi, queue_lo;
41
42			BOOL
43			wave_out_open(void)
44			{
45			char *dsp_dev = "/dev/dsp";
46
47	astrand	499	if ((g_dsp_fd = open(dsp_dev, O_WRONLY \| O_NONBLOCK)) == -1)
48	matthewc	475	{
49			perror(dsp_dev);
50			return False;
51			}
52
53			/* Non-blocking so that user interface is responsive */
54	astrand	499	fcntl(g_dsp_fd, F_SETFL, fcntl(g_dsp_fd, F_GETFL) \| O_NONBLOCK);
55	matthewc	475	return True;
56			}
57
58			void
59			wave_out_close(void)
60			{
61			close(g_dsp_fd);
62			}
63
64			BOOL
65	astrand	499	wave_out_format_supported(WAVEFORMATEX * pwfx)
66	matthewc	475	{
67			if (pwfx->wFormatTag != WAVE_FORMAT_PCM)
68			return False;
69			if ((pwfx->nChannels != 1) && (pwfx->nChannels != 2))
70			return False;
71			if ((pwfx->wBitsPerSample != 8) && (pwfx->wBitsPerSample != 16))
72			return False;
73
74			return True;
75			}
76
77			BOOL
78	astrand	499	wave_out_set_format(WAVEFORMATEX * pwfx)
79	matthewc	475	{
80			int speed, channels, format;
81
82			ioctl(g_dsp_fd, SNDCTL_DSP_RESET, NULL);
83			ioctl(g_dsp_fd, SNDCTL_DSP_SYNC, NULL);
84
85			if (pwfx->wBitsPerSample == 8)
86			format = AFMT_U8;
87			else if (pwfx->wBitsPerSample == 16)
88			format = AFMT_S16_LE;
89
90			if (ioctl(g_dsp_fd, SNDCTL_DSP_SETFMT, &format) == -1)
91			{
92			perror("SNDCTL_DSP_SETFMT");
93			close(g_dsp_fd);
94			return False;
95			}
96
97			channels = pwfx->nChannels;
98			if (ioctl(g_dsp_fd, SNDCTL_DSP_CHANNELS, &channels) == -1)
99			{
100			perror("SNDCTL_DSP_CHANNELS");
101			close(g_dsp_fd);
102			return False;
103			}
104
105			speed = pwfx->nSamplesPerSec;
106			if (ioctl(g_dsp_fd, SNDCTL_DSP_SPEED, &speed) == -1)
107			{
108			perror("SNDCTL_DSP_SPEED");
109			close(g_dsp_fd);
110			return False;
111			}
112
113			return True;
114			}
115
116			void
117	stargo	491	wave_out_volume(uint16 left, uint16 right)
118			{
119			uint32 volume;
120
121	astrand	499	volume = left / (65536 / 100);
122			volume \|= right / (65536 / 100) << 8;
123	stargo	491	if (ioctl(g_dsp_fd, MIXER_WRITE(SOUND_MIXER_PCM), &volume) == -1)
124			{
125			perror("MIXER_WRITE(SOUND_MIXER_PCM)");
126			return;
127			}
128			}
129
130			void
131	matthewc	475	wave_out_write(STREAM s, uint16 tick, uint8 index)
132			{
133	matthewc	476	struct audio_packet *packet = &packet_queue[queue_hi];
134			unsigned int next_hi = (queue_hi + 1) % MAX_QUEUE;
135	matthewc	475
136			if (next_hi == queue_lo)
137			{
138			error("No space to queue audio packet\n");
139			return;
140			}
141
142			queue_hi = next_hi;
143
144			packet->s = *s;
145			packet->tick = tick;
146			packet->index = index;
147	stargo	491	packet->s.p += 4;
148	matthewc	475
149			/* we steal the data buffer from s, give it a new one */
150			s->data = malloc(s->size);
151
152			if (!g_dsp_busy)
153			wave_out_play();
154			}
155
156			void
157			wave_out_play(void)
158			{
159			struct audio_packet *packet;
160			ssize_t len;
161			STREAM out;
162
163			while (1)
164			{
165			if (queue_lo == queue_hi)
166			{
167			g_dsp_busy = 0;
168			return;
169			}
170
171			packet = &packet_queue[queue_lo];
172			out = &packet->s;
173
174	astrand	499	len = write(g_dsp_fd, out->p, out->end - out->p);
175	matthewc	475	if (len == -1)
176			{
177			if (errno != EWOULDBLOCK)
178			perror("write audio");
179			g_dsp_busy = 1;
180			return;
181			}
182
183			out->p += len;
184			if (out->p == out->end)
185			{
186			rdpsnd_send_completion(packet->tick, packet->index);
187			free(out->data);
188			queue_lo = (queue_lo + 1) % MAX_QUEUE;
189			}
190			}
191
192			}