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 tmp;
    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.
     */
    tmp = 0x00100009;
    ioctl(devfd, SNDCTL_DSP_SETFRAGMENT, &tmp);
    tmp = 0;
    ioctl(devfd, SNDCTL_DSP_STEREO, &tmp);
    tmp = 44100;
    ioctl(devfd, SNDCTL_DSP_SPEED, &tmp);
    ioctl(devfd, SOUND_PCM_READ_RATE, &tmp);
    if (tmp < 43000 || tmp > 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
 */

// Rendere 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:	1.4
Committed:	2004-01-12T15:13:20Z (20 years, 10 months ago) by cebix
Content type:	text/plain
Branch:	MAIN
Changes since 1.3:	+1 -1 lines
Log Message:	Happy New Year!
#	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			int tmp;
48			unsigned long format;
49
50			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			/*
62			* Buffer size: 2^9 == 512 bytes. Note that too large buffers will not work
63			* very well: The speed of the C64 is slowed down to an average speed of
64			* 100% by the blocking write() call in EmulateLine(). If you use a buffer
65			* of, say 4096 bytes, that will happen only about every 4 frames, which
66			* means that the emulation runs much faster in some frames, and much
67			* slower in others.
68			* On really fast machines, it might make sense to use an even smaller
69			* buffer size.
70			*/
71			tmp = 0x00100009;
72			ioctl(devfd, SNDCTL_DSP_SETFRAGMENT, &tmp);
73			tmp = 0;
74			ioctl(devfd, SNDCTL_DSP_STEREO, &tmp);
75			tmp = 44100;
76			ioctl(devfd, SNDCTL_DSP_SPEED, &tmp);
77			ioctl(devfd, SOUND_PCM_READ_RATE, &tmp);
78			if (tmp < 43000 \|\| tmp > 45000)
79			return;
80
81			ioctl(devfd, SNDCTL_DSP_GETBLKSIZE, &sndbufsize);
82			sound_buffer = new int16[sndbufsize];
83			ready = true;
84			}
85
86
87			/*
88			* Destructor
89			*/
90
91			DigitalRenderer::~DigitalRenderer()
92			{
93			if (devfd >= 0)
94			close(devfd);
95			}
96
97
98			/*
99			* Pause sound output
100			*/
101
102			void DigitalRenderer::Pause(void)
103			{
104			}
105
106
107			/*
108			* Resume sound output
109			*/
110
111			void DigitalRenderer::Resume(void)
112			{
113			}
114
115
116			/*
117			* Fill buffer, sample volume (for sampled voice)
118			*/
119
120			void DigitalRenderer::EmulateLine(void)
121			{
122			static int divisor = 0;
123			static int to_output = 0;
124			static int buffer_pos = 0;
125
126			if (!ready)
127			return;
128
129			sample_buf[sample_in_ptr] = volume;
130			sample_in_ptr = (sample_in_ptr + 1) % SAMPLE_BUF_SIZE;
131
132			/*
133			* Now see how many samples have to be added for this line
134			*/
135			divisor += SAMPLE_FREQ;
136			while (divisor >= 0)
137			divisor -= TOTAL_RASTERS*SCREEN_FREQ, to_output++;
138
139			/*
140			* Calculate the sound data only when we have enough to fill
141			* the buffer entirely.
142			*/
143			if ((buffer_pos + to_output) >= sndbufsize) {
144			int datalen = sndbufsize - buffer_pos;
145			to_output -= datalen;
146			calc_buffer(sound_buffer + buffer_pos, datalen*2);
147			write(devfd, sound_buffer, sndbufsize*2);
148			buffer_pos = 0;
149			}
150	cebix	1.3	}
151
152
153			/*
154			* Renderer for Catweasel card
155			*/
156
157			// Rendere class
158			class CatweaselRenderer : public SIDRenderer {
159			public:
160			CatweaselRenderer();
161			virtual ~CatweaselRenderer();
162
163			virtual void Reset(void);
164			virtual void EmulateLine(void) {}
165			virtual void WriteRegister(uint16 adr, uint8 byte);
166			virtual void NewPrefs(Prefs *prefs) {}
167			virtual void Pause(void) {}
168			virtual void Resume(void) {}
169
170			private:
171			int cwsid_fh; // Catweasel device file handle
172			};
173
174			// Constructor: Open Catweasel device and reset SID
175			CatweaselRenderer::CatweaselRenderer()
176			{
177			cwsid_fh = open("/dev/sid", O_WRONLY);
178			if (cwsid_fh >= 0) {
179			int i;
180			if (ioctl(cwsid_fh, CWSID_IOCTL_CARDTYPE, &i) < 0 \|\| i != CWSID_MAGIC) {
181			close(cwsid_fh);
182			cwsid_fh = -1;
183			} else {
184			ioctl(cwsid_fh, CWSID_IOCTL_RESET);
185			ioctl(cwsid_fh, CWSID_IOCTL_DOUBLEBUFFER, 0);
186			}
187			}
188
189			Reset();
190			}
191
192			// Destructor: Reset SID and close Catweasel device
193			CatweaselRenderer::~CatweaselRenderer()
194			{
195			Reset();
196
197			if (cwsid_fh >= 0) {
198			close(cwsid_fh);
199			cwsid_fh = -1;
200			}
201			}
202
203			// Reset SID
204			void CatweaselRenderer::Reset(void)
205			{
206			if (cwsid_fh >= 0) {
207			uint8 zero = 0;
208			ioctl(cwsid_fh, CWSID_IOCTL_RESET);
209			lseek(cwsid_fh, 24, SEEK_SET);
210			write(cwsid_fh, &zero, 1);
211			}
212			}
213
214			// Write to register
215			void CatweaselRenderer::WriteRegister(uint16 adr, uint8 byte)
216			{
217			if (cwsid_fh >= 0 && adr < 0x1a) {
218			lseek(cwsid_fh, adr, SEEK_SET);
219			write(cwsid_fh, &byte, 1);
220			lseek(cwsid_fh, adr, SEEK_SET);
221			write(cwsid_fh, &byte, 1);
222			}
223	cebix	1.1	}