rdesktop/trunk/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/time.h>
#include <sys/ioctl.h>
#include <sys/soundcard.h>

#define MAX_QUEUE       10

int g_dsp_fd;
BOOL g_dsp_busy = False;
static int g_snd_rate;
static short g_samplewidth;

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 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;

        g_samplewidth = pwfx->wBitsPerSample / 8;

        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;
        }

        if (channels == 2)
        {
                g_samplewidth *= 2;
        }

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

        return True;
}

void
wave_out_volume(uint16 left, uint16 right)
{
        static BOOL use_dev_mixer = False;
        uint32 volume;
        int fd_mix = -1;

        volume = left / (65536 / 100);
        volume |= right / (65536 / 100) << 8;

        if (use_dev_mixer)
        {
                if ((fd_mix = open("/dev/mixer", O_RDWR | O_NONBLOCK)) == -1)
                {
                        perror("open /dev/mixer");
                        return;
                }

                if (ioctl(fd_mix, MIXER_WRITE(SOUND_MIXER_PCM), &volume) == -1)
                {
                        perror("MIXER_WRITE(SOUND_MIXER_PCM)");
                        return;
                }

                close(fd_mix);
        }

        if (ioctl(g_dsp_fd, MIXER_WRITE(SOUND_MIXER_PCM), &volume) == -1)
        {
                perror("MIXER_WRITE(SOUND_MIXER_PCM)");
                use_dev_mixer = True;
                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;
        static long startedat_us;
        static long startedat_s;
        static BOOL started = False;
        struct timeval tv;

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

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

                if (!started)
                {
                        gettimeofday(&tv, NULL);
                        startedat_us = tv.tv_usec;
                        startedat_s = tv.tv_sec;
                        started = True;
                }

                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)
                {
                        long long duration;
                        long elapsed;

                        gettimeofday(&tv, NULL);
                        duration = (out->size * (1000000 / (g_samplewidth * g_snd_rate)));
                        elapsed = (tv.tv_sec - startedat_s) * 1000000 + (tv.tv_usec - startedat_us);

                        if (elapsed >= (duration * 7) / 10)
                        {
                                rdpsnd_send_completion(packet->tick, packet->index);
                                free(out->data);
                                queue_lo = (queue_lo + 1) % MAX_QUEUE;
                                started = False;
                        }
                        else
                        {
                                g_dsp_busy = 1;
                                return;
                        }
                }
        }
}
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	stargo	510	#include <sys/time.h>
27	matthewc	475	#include <sys/ioctl.h>
28			#include <sys/soundcard.h>
29
30			#define MAX_QUEUE 10
31
32			int g_dsp_fd;
33	stargo	504	BOOL g_dsp_busy = False;
34	stargo	510	static int g_snd_rate;
35			static short g_samplewidth;
36	matthewc	475
37	astrand	499	static struct audio_packet
38			{
39	matthewc	475	struct stream s;
40			uint16 tick;
41			uint8 index;
42			} packet_queue[MAX_QUEUE];
43			static unsigned int queue_hi, queue_lo;
44
45			BOOL
46			wave_out_open(void)
47			{
48			char *dsp_dev = "/dev/dsp";
49
50	astrand	499	if ((g_dsp_fd = open(dsp_dev, O_WRONLY \| O_NONBLOCK)) == -1)
51	matthewc	475	{
52			perror(dsp_dev);
53			return False;
54			}
55
56			/* Non-blocking so that user interface is responsive */
57	astrand	499	fcntl(g_dsp_fd, F_SETFL, fcntl(g_dsp_fd, F_GETFL) \| O_NONBLOCK);
58	matthewc	475	return True;
59			}
60
61			void
62			wave_out_close(void)
63			{
64			close(g_dsp_fd);
65			}
66
67			BOOL
68	astrand	499	wave_out_format_supported(WAVEFORMATEX * pwfx)
69	matthewc	475	{
70			if (pwfx->wFormatTag != WAVE_FORMAT_PCM)
71			return False;
72			if ((pwfx->nChannels != 1) && (pwfx->nChannels != 2))
73			return False;
74			if ((pwfx->wBitsPerSample != 8) && (pwfx->wBitsPerSample != 16))
75			return False;
76
77			return True;
78			}
79
80			BOOL
81	astrand	499	wave_out_set_format(WAVEFORMATEX * pwfx)
82	matthewc	475	{
83	stargo	510	int channels, format;
84	matthewc	475
85			ioctl(g_dsp_fd, SNDCTL_DSP_RESET, NULL);
86			ioctl(g_dsp_fd, SNDCTL_DSP_SYNC, NULL);
87
88			if (pwfx->wBitsPerSample == 8)
89			format = AFMT_U8;
90			else if (pwfx->wBitsPerSample == 16)
91			format = AFMT_S16_LE;
92
93	stargo	510	g_samplewidth = pwfx->wBitsPerSample / 8;
94
95	matthewc	475	if (ioctl(g_dsp_fd, SNDCTL_DSP_SETFMT, &format) == -1)
96			{
97			perror("SNDCTL_DSP_SETFMT");
98			close(g_dsp_fd);
99			return False;
100			}
101
102			channels = pwfx->nChannels;
103			if (ioctl(g_dsp_fd, SNDCTL_DSP_CHANNELS, &channels) == -1)
104			{
105			perror("SNDCTL_DSP_CHANNELS");
106			close(g_dsp_fd);
107			return False;
108			}
109
110	stargo	510	if (channels == 2)
111	matthewc	475	{
112	stargo	510	g_samplewidth *= 2;
113			}
114
115			g_snd_rate = pwfx->nSamplesPerSec;
116			if (ioctl(g_dsp_fd, SNDCTL_DSP_SPEED, &g_snd_rate) == -1)
117			{
118	matthewc	475	perror("SNDCTL_DSP_SPEED");
119			close(g_dsp_fd);
120			return False;
121			}
122
123			return True;
124			}
125
126			void
127	stargo	491	wave_out_volume(uint16 left, uint16 right)
128			{
129	stargo	509	static BOOL use_dev_mixer = False;
130	stargo	491	uint32 volume;
131	stargo	509	int fd_mix = -1;
132	stargo	491
133	astrand	499	volume = left / (65536 / 100);
134			volume \|= right / (65536 / 100) << 8;
135	stargo	509
136			if (use_dev_mixer)
137			{
138	astrand	532	if ((fd_mix = open("/dev/mixer", O_RDWR \| O_NONBLOCK)) == -1)
139	stargo	509	{
140			perror("open /dev/mixer");
141			return;
142			}
143
144			if (ioctl(fd_mix, MIXER_WRITE(SOUND_MIXER_PCM), &volume) == -1)
145			{
146			perror("MIXER_WRITE(SOUND_MIXER_PCM)");
147			return;
148			}
149
150			close(fd_mix);
151			}
152
153	stargo	491	if (ioctl(g_dsp_fd, MIXER_WRITE(SOUND_MIXER_PCM), &volume) == -1)
154			{
155			perror("MIXER_WRITE(SOUND_MIXER_PCM)");
156	stargo	509	use_dev_mixer = True;
157	stargo	491	return;
158			}
159			}
160
161			void
162	matthewc	475	wave_out_write(STREAM s, uint16 tick, uint8 index)
163			{
164	matthewc	476	struct audio_packet *packet = &packet_queue[queue_hi];
165			unsigned int next_hi = (queue_hi + 1) % MAX_QUEUE;
166	matthewc	475
167			if (next_hi == queue_lo)
168			{
169			error("No space to queue audio packet\n");
170			return;
171			}
172
173			queue_hi = next_hi;
174
175			packet->s = *s;
176			packet->tick = tick;
177			packet->index = index;
178	stargo	491	packet->s.p += 4;
179	matthewc	475
180			/* we steal the data buffer from s, give it a new one */
181			s->data = malloc(s->size);
182
183			if (!g_dsp_busy)
184			wave_out_play();
185			}
186
187			void
188			wave_out_play(void)
189			{
190			struct audio_packet *packet;
191			ssize_t len;
192			STREAM out;
193	stargo	510	static long startedat_us;
194			static long startedat_s;
195			static BOOL started = False;
196			struct timeval tv;
197	matthewc	475
198			while (1)
199			{
200			if (queue_lo == queue_hi)
201			{
202			g_dsp_busy = 0;
203			return;
204			}
205
206			packet = &packet_queue[queue_lo];
207			out = &packet->s;
208
209	stargo	510	if (!started)
210			{
211			gettimeofday(&tv, NULL);
212			startedat_us = tv.tv_usec;
213			startedat_s = tv.tv_sec;
214			started = True;
215			}
216
217	astrand	499	len = write(g_dsp_fd, out->p, out->end - out->p);
218	matthewc	475	if (len == -1)
219			{
220			if (errno != EWOULDBLOCK)
221			perror("write audio");
222			g_dsp_busy = 1;
223			return;
224			}
225
226			out->p += len;
227			if (out->p == out->end)
228			{
229	stargo	510	long long duration;
230			long elapsed;
231	astrand	532
232	stargo	510	gettimeofday(&tv, NULL);
233	astrand	532	duration = (out->size * (1000000 / (g_samplewidth * g_snd_rate)));
234			elapsed = (tv.tv_sec - startedat_s) * 1000000 + (tv.tv_usec - startedat_us);
235	stargo	510
236	astrand	532	if (elapsed >= (duration * 7) / 10)
237	stargo	510	{
238			rdpsnd_send_completion(packet->tick, packet->index);
239			free(out->data);
240			queue_lo = (queue_lo + 1) % MAX_QUEUE;
241			started = False;
242			}
243			else
244			{
245			g_dsp_busy = 1;
246			return;
247			}
248	matthewc	475	}
249			}
250			}