Frodo4/Src/SID_linux.h

/*
 *  SID_linux.h - 6581 emulation, Linux specific stuff
 *
 *  Frodo (C) 1994-1997,2002-2004 Christian Bauer
 *
 *  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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

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

// Catweasel ioctls (included here for convenience)
#include <linux/ioctl.h>
#define CWSID_IOCTL_TYPE ('S')
#define CWSID_IOCTL_RESET        _IO(CWSID_IOCTL_TYPE, 0)
#define CWSID_IOCTL_CARDTYPE     _IOR(CWSID_IOCTL_TYPE, 4, int)
#define CWSID_IOCTL_PAL          _IO(CWSID_IOCTL_TYPE, 0x11)
#define CWSID_IOCTL_NTSC         _IO(CWSID_IOCTL_TYPE, 0x12)
#define CWSID_IOCTL_DOUBLEBUFFER _IOW(CWSID_IOCTL_TYPE, 0x21, int)
#define CWSID_IOCTL_DELAY        _IOW(CWSID_IOCTL_TYPE, 0x22, int)
#define CWSID_MAGIC 0x100
#define HAVE_CWSID 1

#include "VIC.h"


/*
 *  Initialization
 */

void DigitalRenderer::init_sound(void)
{
        int arg;
        unsigned long format;

        ready = false;
        devfd = open("/dev/dsp", O_WRONLY);
        if (devfd < 0)
                return;

        ioctl(devfd, SNDCTL_DSP_GETFMTS, &format);
        if (!(format & AFMT_S16_LE))
                return;
        format = AFMT_S16_LE;
        ioctl(devfd, SNDCTL_DSP_SETFMT, &format);

        // Buffer size: 2^9 == 512 bytes. Note that too large buffers will not work
        // very well: The speed of the C64 is slowed down to an average speed of
        // 100% by the blocking write() call in EmulateLine(). If you use a buffer
        // of, say 4096 bytes, that will happen only about every 4 frames, which
        // means that the emulation runs much faster in some frames, and much
        // slower in others.
        // On really fast machines, it might make sense to use an even smaller
        // buffer size.
        arg = 0x00100009;
        ioctl(devfd, SNDCTL_DSP_SETFRAGMENT, &arg);
        arg = 0;
        ioctl(devfd, SNDCTL_DSP_STEREO, &arg);
        arg = 44100;
        ioctl(devfd, SNDCTL_DSP_SPEED, &arg);
        ioctl(devfd, SOUND_PCM_READ_RATE, &arg);
        if (arg < 43000 || arg > 45000)
                return;

        ioctl(devfd, SNDCTL_DSP_GETBLKSIZE, &sndbufsize);
        sound_buffer = new int16[sndbufsize];
        ready = true;
}


/*
 *  Destructor
 */

DigitalRenderer::~DigitalRenderer()
{
        if (devfd >= 0)
                close(devfd);
}


/*
 *  Pause sound output
 */

void DigitalRenderer::Pause(void)
{
}


/*
 * Resume sound output
 */

void DigitalRenderer::Resume(void)
{
}


/*
 * Fill buffer, sample volume (for sampled voice)
 */

void DigitalRenderer::EmulateLine(void)
{
        static int divisor = 0;
        static int to_output = 0;
        static int buffer_pos = 0;

        if (!ready)
                return;

        sample_buf[sample_in_ptr] = volume;
        sample_in_ptr = (sample_in_ptr + 1) % SAMPLE_BUF_SIZE;

        // Now see how many samples have to be added for this line
        divisor += SAMPLE_FREQ;
        while (divisor >= 0)
                divisor -= TOTAL_RASTERS*SCREEN_FREQ, to_output++;

        // Calculate the sound data only when we have enough to fill
        // the buffer entirely
        if ((buffer_pos + to_output) >= sndbufsize) {
                int datalen = sndbufsize - buffer_pos;
                to_output -= datalen;
                calc_buffer(sound_buffer + buffer_pos, datalen*2);
                write(devfd, sound_buffer, sndbufsize*2);
                buffer_pos = 0;
        }
}


/*
 *  Renderer for Catweasel card
 */

// Renderer class
class CatweaselRenderer : public SIDRenderer {
public:
        CatweaselRenderer();
        virtual ~CatweaselRenderer();

        virtual void Reset(void);
        virtual void EmulateLine(void) {}
        virtual void WriteRegister(uint16 adr, uint8 byte);
        virtual void NewPrefs(Prefs *prefs) {}
        virtual void Pause(void) {}
        virtual void Resume(void) {}

private:
        int cwsid_fh; // Catweasel device file handle
};

// Constructor: Open Catweasel device and reset SID
CatweaselRenderer::CatweaselRenderer()
{
        cwsid_fh = open("/dev/sid", O_WRONLY);
        if (cwsid_fh >= 0) {
                int i;
                if (ioctl(cwsid_fh, CWSID_IOCTL_CARDTYPE, &i) < 0 || i != CWSID_MAGIC) {
                        close(cwsid_fh);
                        cwsid_fh = -1;
                } else {
                        ioctl(cwsid_fh, CWSID_IOCTL_RESET);
                        ioctl(cwsid_fh, CWSID_IOCTL_DOUBLEBUFFER, 0);
                }
        }

        Reset();
}

// Destructor: Reset SID and close Catweasel device
CatweaselRenderer::~CatweaselRenderer()
{
        Reset();

        if (cwsid_fh >= 0) {
                close(cwsid_fh);
                cwsid_fh = -1;
        }
}

// Reset SID
void CatweaselRenderer::Reset(void)
{
        if (cwsid_fh >= 0) {
                uint8 zero = 0;
                ioctl(cwsid_fh, CWSID_IOCTL_RESET);
                lseek(cwsid_fh, 24, SEEK_SET);
                write(cwsid_fh, &zero, 1);
        }
}

// Write to register
void CatweaselRenderer::WriteRegister(uint16 adr, uint8 byte)
{
        if (cwsid_fh >= 0 && adr < 0x1a) {
                lseek(cwsid_fh, adr, SEEK_SET);
                write(cwsid_fh, &byte, 1);
                lseek(cwsid_fh, adr, SEEK_SET);
                write(cwsid_fh, &byte, 1);
        }
}
Revision:	1.5
Committed:	2004-12-04T13:24:35Z (19 years, 11 months ago) by cebix
Content type:	text/plain
Branch:	MAIN
Changes since 1.4:	+56 -62 lines
Log Message:	fixed style
#	User	Rev	Content
1	cebix	1.1	/*
2			* SID_linux.h - 6581 emulation, Linux specific stuff
3			*
4	cebix	1.4	* Frodo (C) 1994-1997,2002-2004 Christian Bauer
5	cebix	1.1	*
6			* This program is free software; you can redistribute it and/or modify
7			* it under the terms of the GNU General Public License as published by
8			* the Free Software Foundation; either version 2 of the License, or
9			* (at your option) any later version.
10			*
11			* This program is distributed in the hope that it will be useful,
12			* but WITHOUT ANY WARRANTY; without even the implied warranty of
13			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14			* GNU General Public License for more details.
15			*
16			* You should have received a copy of the GNU General Public License
17			* along with this program; if not, write to the Free Software
18			* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19			*/
20
21			#include <unistd.h>
22			#include <fcntl.h>
23			#include <sys/ioctl.h>
24			#include <linux/soundcard.h>
25
26	cebix	1.3	// Catweasel ioctls (included here for convenience)
27			#include <linux/ioctl.h>
28			#define CWSID_IOCTL_TYPE ('S')
29			#define CWSID_IOCTL_RESET _IO(CWSID_IOCTL_TYPE, 0)
30			#define CWSID_IOCTL_CARDTYPE _IOR(CWSID_IOCTL_TYPE, 4, int)
31			#define CWSID_IOCTL_PAL _IO(CWSID_IOCTL_TYPE, 0x11)
32			#define CWSID_IOCTL_NTSC _IO(CWSID_IOCTL_TYPE, 0x12)
33			#define CWSID_IOCTL_DOUBLEBUFFER _IOW(CWSID_IOCTL_TYPE, 0x21, int)
34			#define CWSID_IOCTL_DELAY _IOW(CWSID_IOCTL_TYPE, 0x22, int)
35			#define CWSID_MAGIC 0x100
36			#define HAVE_CWSID 1
37
38	cebix	1.1	#include "VIC.h"
39
40
41			/*
42			* Initialization
43			*/
44
45			void DigitalRenderer::init_sound(void)
46			{
47	cebix	1.5	int arg;
48			unsigned long format;
49	cebix	1.1
50	cebix	1.5	ready = false;
51			devfd = open("/dev/dsp", O_WRONLY);
52			if (devfd < 0)
53			return;
54
55			ioctl(devfd, SNDCTL_DSP_GETFMTS, &format);
56			if (!(format & AFMT_S16_LE))
57			return;
58			format = AFMT_S16_LE;
59			ioctl(devfd, SNDCTL_DSP_SETFMT, &format);
60
61			// Buffer size: 2^9 == 512 bytes. Note that too large buffers will not work
62			// very well: The speed of the C64 is slowed down to an average speed of
63			// 100% by the blocking write() call in EmulateLine(). If you use a buffer
64			// of, say 4096 bytes, that will happen only about every 4 frames, which
65			// means that the emulation runs much faster in some frames, and much
66			// slower in others.
67			// On really fast machines, it might make sense to use an even smaller
68			// buffer size.
69			arg = 0x00100009;
70			ioctl(devfd, SNDCTL_DSP_SETFRAGMENT, &arg);
71			arg = 0;
72			ioctl(devfd, SNDCTL_DSP_STEREO, &arg);
73			arg = 44100;
74			ioctl(devfd, SNDCTL_DSP_SPEED, &arg);
75			ioctl(devfd, SOUND_PCM_READ_RATE, &arg);
76			if (arg < 43000 \|\| arg > 45000)
77			return;
78
79			ioctl(devfd, SNDCTL_DSP_GETBLKSIZE, &sndbufsize);
80			sound_buffer = new int16[sndbufsize];
81			ready = true;
82	cebix	1.1	}
83
84
85			/*
86			* Destructor
87			*/
88
89			DigitalRenderer::~DigitalRenderer()
90			{
91	cebix	1.5	if (devfd >= 0)
92			close(devfd);
93	cebix	1.1	}
94
95
96			/*
97			* Pause sound output
98			*/
99
100			void DigitalRenderer::Pause(void)
101			{
102			}
103
104
105			/*
106			* Resume sound output
107			*/
108
109			void DigitalRenderer::Resume(void)
110			{
111			}
112
113
114			/*
115			* Fill buffer, sample volume (for sampled voice)
116			*/
117
118			void DigitalRenderer::EmulateLine(void)
119			{
120	cebix	1.5	static int divisor = 0;
121			static int to_output = 0;
122			static int buffer_pos = 0;
123	cebix	1.1
124	cebix	1.5	if (!ready)
125			return;
126	cebix	1.1
127			sample_buf[sample_in_ptr] = volume;
128			sample_in_ptr = (sample_in_ptr + 1) % SAMPLE_BUF_SIZE;
129
130	cebix	1.5	// Now see how many samples have to be added for this line
131			divisor += SAMPLE_FREQ;
132			while (divisor >= 0)
133			divisor -= TOTAL_RASTERS*SCREEN_FREQ, to_output++;
134
135			// Calculate the sound data only when we have enough to fill
136			// the buffer entirely
137			if ((buffer_pos + to_output) >= sndbufsize) {
138			int datalen = sndbufsize - buffer_pos;
139			to_output -= datalen;
140			calc_buffer(sound_buffer + buffer_pos, datalen*2);
141			write(devfd, sound_buffer, sndbufsize*2);
142			buffer_pos = 0;
143			}
144	cebix	1.3	}
145
146
147			/*
148			* Renderer for Catweasel card
149			*/
150
151	cebix	1.5	// Renderer class
152	cebix	1.3	class CatweaselRenderer : public SIDRenderer {
153			public:
154			CatweaselRenderer();
155			virtual ~CatweaselRenderer();
156
157			virtual void Reset(void);
158			virtual void EmulateLine(void) {}
159			virtual void WriteRegister(uint16 adr, uint8 byte);
160			virtual void NewPrefs(Prefs *prefs) {}
161			virtual void Pause(void) {}
162			virtual void Resume(void) {}
163
164			private:
165			int cwsid_fh; // Catweasel device file handle
166			};
167
168			// Constructor: Open Catweasel device and reset SID
169			CatweaselRenderer::CatweaselRenderer()
170			{
171			cwsid_fh = open("/dev/sid", O_WRONLY);
172			if (cwsid_fh >= 0) {
173			int i;
174			if (ioctl(cwsid_fh, CWSID_IOCTL_CARDTYPE, &i) < 0 \|\| i != CWSID_MAGIC) {
175			close(cwsid_fh);
176			cwsid_fh = -1;
177			} else {
178			ioctl(cwsid_fh, CWSID_IOCTL_RESET);
179			ioctl(cwsid_fh, CWSID_IOCTL_DOUBLEBUFFER, 0);
180			}
181			}
182
183			Reset();
184			}
185
186			// Destructor: Reset SID and close Catweasel device
187			CatweaselRenderer::~CatweaselRenderer()
188			{
189			Reset();
190
191			if (cwsid_fh >= 0) {
192			close(cwsid_fh);
193			cwsid_fh = -1;
194			}
195			}
196
197			// Reset SID
198			void CatweaselRenderer::Reset(void)
199			{
200			if (cwsid_fh >= 0) {
201			uint8 zero = 0;
202			ioctl(cwsid_fh, CWSID_IOCTL_RESET);
203			lseek(cwsid_fh, 24, SEEK_SET);
204			write(cwsid_fh, &zero, 1);
205			}
206			}
207
208			// Write to register
209			void CatweaselRenderer::WriteRegister(uint16 adr, uint8 byte)
210			{
211			if (cwsid_fh >= 0 && adr < 0x1a) {
212			lseek(cwsid_fh, adr, SEEK_SET);
213			write(cwsid_fh, &byte, 1);
214			lseek(cwsid_fh, adr, SEEK_SET);
215			write(cwsid_fh, &byte, 1);
216			}
217	cebix	1.1	}