src/Unix/audio_oss_esd.cpp

/*
 *  audio_oss_esd.cpp - Audio support, implementation for OSS and ESD (Linux and FreeBSD)
 *
 *  Basilisk II (C) 1997-1999 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 "sysdeps.h"

#include <sys/ioctl.h>
#include <unistd.h>
#include <errno.h>
#include <pthread.h>
#include <semaphore.h>

#ifdef __linux__
#include <linux/soundcard.h>
#endif

#ifdef __FreeBSD__
#include <machine/soundcard.h>
#endif

#include "cpu_emulation.h"
#include "main.h"
#include "prefs.h"
#include "user_strings.h"
#include "audio.h"
#include "audio_defs.h"

#if ENABLE_ESD
#include <esd.h>
#endif

#define DEBUG 0
#include "debug.h"


// Supported sample rates, sizes and channels
int audio_num_sample_rates = 1;
uint32 audio_sample_rates[] = {44100 << 16};
int audio_num_sample_sizes = 1;
uint16 audio_sample_sizes[] = {16};
int audio_num_channel_counts = 1;
uint16 audio_channel_counts[] = {2};

// Constants
#define DSP_NAME "/dev/dsp"

// Global variables
static int audio_fd = -1;                                                       // fd of /dev/dsp or ESD
static int mixer_fd = -1;                                                       // fd of /dev/mixer
static sem_t audio_irq_done_sem;                                        // Signal from interrupt to streaming thread: data block read
static bool sem_inited = false;                                         // Flag: audio_irq_done_sem initialized
static int sound_buffer_size;                                           // Size of sound buffer in bytes
static bool little_endian = false;                                      // Flag: DSP accepts only little-endian 16-bit sound data
static pthread_t stream_thread;                                         // Audio streaming thread
static pthread_attr_t stream_thread_attr;                       // Streaming thread attributes
static bool stream_thread_active = false;                       // Flag: streaming thread installed
static volatile bool stream_thread_cancel = false;      // Flag: cancel streaming thread

// Prototypes
static void *stream_func(void *arg);


/*
 *  Initialization
 */

// Init using /dev/dsp, returns false on error
bool audio_init_dsp(void)
{
        printf("Using " DSP_NAME " audio output\n");

        // Get supported sample formats
        unsigned long format;
        ioctl(audio_fd, SNDCTL_DSP_GETFMTS, &format);
        if ((format & (AFMT_U8 | AFMT_S16_BE | AFMT_S16_LE)) == 0) {
                WarningAlert(GetString(STR_AUDIO_FORMAT_WARN));
                close(audio_fd);
                audio_fd = -1;
                return false;
        }
        if (format & (AFMT_S16_BE | AFMT_S16_LE))
                audio_sample_sizes[0] = 16;
        else
                audio_sample_sizes[0] = 8;
        if (!(format & AFMT_S16_BE))
                little_endian = true;

        // Set DSP parameters
        format = AudioStatus.sample_size == 8 ? AFMT_U8 : (little_endian ? AFMT_S16_LE : AFMT_S16_BE);
        ioctl(audio_fd, SNDCTL_DSP_SETFMT, &format);
        int frag = 0x0004000c;          // Block size: 4096 frames
        ioctl(audio_fd, SNDCTL_DSP_SETFRAGMENT, &frag);
        int stereo = (AudioStatus.channels == 2);
        ioctl(audio_fd, SNDCTL_DSP_STEREO, &stereo);
        int rate = AudioStatus.sample_rate >> 16;
        ioctl(audio_fd, SNDCTL_DSP_SPEED, &rate);

        // Get sound buffer size
        ioctl(audio_fd, SNDCTL_DSP_GETBLKSIZE, &audio_frames_per_block);
        D(bug("DSP_GETBLKSIZE %d\n", audio_frames_per_block));
        sound_buffer_size = (AudioStatus.sample_size >> 3) * AudioStatus.channels * audio_frames_per_block;
        return true;
}

// Init using ESD, returns false on error
bool audio_init_esd(void)
{
#if ENABLE_ESD
        printf("Using ESD audio output\n");

        // ESD audio format
        esd_format_t format = ESD_STREAM | ESD_PLAY;
        if (AudioStatus.sample_size == 8)
                format |= ESD_BITS8;
        else
                format |= ESD_BITS16;
        if (AudioStatus.channels == 1)
                format |= ESD_MONO;
        else
                format |= ESD_STEREO;

#if WORDS_BIGENDIAN
        little_endian = false;
#else
        little_endian = true;
#endif

        // Open connection to ESD server
        audio_fd = esd_play_stream(format, AudioStatus.sample_rate >> 16, NULL, NULL);
        if (audio_fd < 0) {
                char str[256];
                sprintf(str, GetString(STR_NO_ESD_WARN), strerror(errno));
                WarningAlert(str);
                return false;
        }

        // Sound buffer size = 4096 frames
        audio_frames_per_block = 4096;
        sound_buffer_size = (AudioStatus.sample_size >> 3) * AudioStatus.channels * audio_frames_per_block;
        return true;
#else
        ErrorAlert("Basilisk II has been compiled with ESD support disabled.");
        return false;
#endif
}

void AudioInit(void)
{
        char str[256];

        // Init audio status (defaults) and feature flags
        AudioStatus.sample_rate = audio_sample_rates[0];
        AudioStatus.sample_size = audio_sample_sizes[0];
        AudioStatus.channels = audio_channel_counts[0];
        AudioStatus.mixer = 0;
        AudioStatus.num_sources = 0;
        audio_component_flags = cmpWantsRegisterMessage | kStereoOut | k16BitOut;

        // Sound disabled in prefs? Then do nothing
        if (PrefsFindBool("nosound"))
                return;

        // Try to open /dev/dsp
        audio_fd = open(DSP_NAME, O_WRONLY);
        if (audio_fd < 0) {
#if ENABLE_ESD
                if (!audio_init_esd())
                        return;
#else
                sprintf(str, GetString(STR_NO_AUDIO_DEV_WARN), DSP_NAME, strerror(errno));
                WarningAlert(str);
                return;
#endif
        } else
                if (!audio_init_dsp())
                        return;

        // Try to open /dev/mixer
        mixer_fd = open("/dev/mixer", O_RDWR);
        if (mixer_fd < 0)
                printf("WARNING: Cannot open /dev/mixer (%s)", strerror(errno));

        // Init semaphore
        if (sem_init(&audio_irq_done_sem, 0, 0) < 0)
                return;
        sem_inited = true;

        // Start streaming thread
        pthread_attr_init(&stream_thread_attr);
#if defined(_POSIX_THREAD_PRIORITY_SCHEDULING)
        if (geteuid() == 0) {
                pthread_attr_setinheritsched(&stream_thread_attr, PTHREAD_EXPLICIT_SCHED);
                pthread_attr_setschedpolicy(&stream_thread_attr, SCHED_FIFO);
                struct sched_param fifo_param;
                fifo_param.sched_priority = (sched_get_priority_min(SCHED_FIFO) + sched_get_priority_max(SCHED_FIFO)) / 2;
                pthread_attr_setschedparam(&stream_thread_attr, &fifo_param);
        }
#endif
        stream_thread_active = (pthread_create(&stream_thread, &stream_thread_attr, stream_func, NULL) == 0);

        // Everything OK
        audio_open = true;
}


/*
 *  Deinitialization
 */

void AudioExit(void)
{
        // Stop stream and delete semaphore
        if (stream_thread_active) {
                stream_thread_cancel = true;
#ifdef HAVE_PTHREAD_CANCEL
                pthread_cancel(stream_thread);
#endif
                pthread_join(stream_thread, NULL);
                stream_thread_active = false;
        }
        if (sem_inited)
                sem_destroy(&audio_irq_done_sem);

        // Close /dev/dsp
        if (audio_fd > 0)
                close(audio_fd);

        // Close /dev/mixer
        if (mixer_fd > 0)
                close(mixer_fd);
}


/*
 *  First source added, start audio stream
 */

void audio_enter_stream()
{
        // Streaming thread is always running to avoid clicking noises
}


/*
 *  Last source removed, stop audio stream
 */

void audio_exit_stream()
{
        // Streaming thread is always running to avoid clicking noises
}


/*
 *  Streaming function
 */

static uint32 apple_stream_info;        // Mac address of SoundComponentData struct describing next buffer

static void *stream_func(void *arg)
{
        int16 *silent_buffer = new int16[sound_buffer_size / 2];
        int16 *last_buffer = new int16[sound_buffer_size / 2];
        memset(silent_buffer, 0, sound_buffer_size);

        while (!stream_thread_cancel) {
                if (AudioStatus.num_sources) {

                        // Trigger audio interrupt to get new buffer
                        D(bug("stream: triggering irq\n"));
                        SetInterruptFlag(INTFLAG_AUDIO);
                        TriggerInterrupt();
                        D(bug("stream: waiting for ack\n"));
                        sem_wait(&audio_irq_done_sem);
                        D(bug("stream: ack received\n"));

                        // Get size of audio data
                        uint32 apple_stream_info = ReadMacInt32(audio_data + adatStreamInfo);
                        if (apple_stream_info) {
                                int work_size = ReadMacInt32(apple_stream_info + scd_sampleCount) * (AudioStatus.sample_size >> 3) * AudioStatus.channels;
                                D(bug("stream: work_size %d\n", work_size));
                                if (work_size > sound_buffer_size)
                                        work_size = sound_buffer_size;
                                if (work_size == 0)
                                        goto silence;

                                // Send data to DSP
                                if (work_size == sound_buffer_size && !little_endian)
                                        write(audio_fd, Mac2HostAddr(ReadMacInt32(apple_stream_info + scd_buffer)), sound_buffer_size);
                                else {
                                        // Last buffer or little-endian DSP
                                        if (little_endian) {
                                                int16 *p = (int16 *)Mac2HostAddr(ReadMacInt32(apple_stream_info + scd_buffer));
                                                for (int i=0; i<work_size/2; i++)
                                                        last_buffer[i] = ntohs(p[i]);
                                        } else
                                                memcpy(last_buffer, Mac2HostAddr(ReadMacInt32(apple_stream_info + scd_buffer)), work_size);
                                        memset((uint8 *)last_buffer + work_size, 0, sound_buffer_size - work_size);
                                        write(audio_fd, last_buffer, sound_buffer_size);
                                }
                                D(bug("stream: data written\n"));
                        } else
                                goto silence;

                } else {

                        // Audio not active, play silence
silence:        write(audio_fd, silent_buffer, sound_buffer_size);
                }
        }
        delete[] silent_buffer;
        delete[] last_buffer;
        return NULL;
}


/*
 *  MacOS audio interrupt, read next data block
 */

void AudioInterrupt(void)
{
        D(bug("AudioInterrupt\n"));

        // Get data from apple mixer
        if (AudioStatus.mixer) {
                M68kRegisters r;
                r.a[0] = audio_data + adatStreamInfo;
                r.a[1] = AudioStatus.mixer;
                Execute68k(audio_data + adatGetSourceData, &r);
                D(bug(" GetSourceData() returns %08lx\n", r.d[0]));
        } else
                WriteMacInt32(audio_data + adatStreamInfo, 0);

        // Signal stream function
        sem_post(&audio_irq_done_sem);
        D(bug("AudioInterrupt done\n"));
}


/*
 *  Set sampling parameters
 *  "index" is an index into the audio_sample_rates[] etc. arrays
 *  It is guaranteed that AudioStatus.num_sources == 0
 */

void audio_set_sample_rate(int index)
{
}

void audio_set_sample_size(int index)
{
}

void audio_set_channels(int index)
{
}


/*
 *  Get/set volume controls (volume values received/returned have the left channel
 *  volume in the upper 16 bits and the right channel volume in the lower 16 bits;
 *  both volumes are 8.8 fixed point values with 0x0100 meaning "maximum volume"))
 */

bool audio_get_main_mute(void)
{
        return false;
}

uint32 audio_get_main_volume(void)
{
        if (mixer_fd >= 0) {
                int vol;
                if (ioctl(mixer_fd, SOUND_MIXER_READ_PCM, &vol) == 0) {
                        int left = vol >> 8;
                        int right = vol & 0xff;
                        return ((left * 256 / 100) << 16) | (right * 256 / 100);
                }
        }
        return 0x01000100;
}

bool audio_get_speaker_mute(void)
{
        return false;
}

uint32 audio_get_speaker_volume(void)
{
        if (mixer_fd >= 0) {
                int vol;
                if (ioctl(mixer_fd, SOUND_MIXER_READ_VOLUME, &vol) == 0) {
                        int left = vol >> 8;
                        int right = vol & 0xff;
                        return ((left * 256 / 100) << 16) | (right * 256 / 100);
                }
        }
        return 0x01000100;
}

void audio_set_main_mute(bool mute)
{
}

void audio_set_main_volume(uint32 vol)
{
        if (mixer_fd >= 0) {
                int left = vol >> 16;
                int right = vol & 0xffff;
                int p = ((left * 100 / 256) << 8) | (right * 100 / 256);
                ioctl(mixer_fd, SOUND_MIXER_WRITE_PCM, &p);
        }
}

void audio_set_speaker_mute(bool mute)
{
}

void audio_set_speaker_volume(uint32 vol)
{
        if (mixer_fd >= 0) {
                int left = vol >> 16;
                int right = vol & 0xffff;
                int p = ((left * 100 / 256) << 8) | (right * 100 / 256);
                ioctl(mixer_fd, SOUND_MIXER_WRITE_VOLUME, &p);
        }
}
Revision:	1.1
Committed:	1999-10-23T17:57:45Z (24 years, 8 months ago) by cebix
Branch:	MAIN
Log Message:	- audio_linux.cpp renamed to audio_oss_esd.cpp (now also used under FreeBSD) and added support for ESD - medium removal is allowed for CD-ROM on exit - added mkinstalldirs to "make install" target
#	Content
1	/*
2	* audio_oss_esd.cpp - Audio support, implementation for OSS and ESD (Linux and FreeBSD)
3	*
4	* Basilisk II (C) 1997-1999 Christian Bauer
5	*
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 "sysdeps.h"
22
23	#include <sys/ioctl.h>
24	#include <unistd.h>
25	#include <errno.h>
26	#include <pthread.h>
27	#include <semaphore.h>
28
29	#ifdef __linux__
30	#include <linux/soundcard.h>
31	#endif
32
33	#ifdef __FreeBSD__
34	#include <machine/soundcard.h>
35	#endif
36
37	#include "cpu_emulation.h"
38	#include "main.h"
39	#include "prefs.h"
40	#include "user_strings.h"
41	#include "audio.h"
42	#include "audio_defs.h"
43
44	#if ENABLE_ESD
45	#include <esd.h>
46	#endif
47
48	#define DEBUG 0
49	#include "debug.h"
50
51
52	// Supported sample rates, sizes and channels
53	int audio_num_sample_rates = 1;
54	uint32 audio_sample_rates[] = {44100 << 16};
55	int audio_num_sample_sizes = 1;
56	uint16 audio_sample_sizes[] = {16};
57	int audio_num_channel_counts = 1;
58	uint16 audio_channel_counts[] = {2};
59
60	// Constants
61	#define DSP_NAME "/dev/dsp"
62
63	// Global variables
64	static int audio_fd = -1; // fd of /dev/dsp or ESD
65	static int mixer_fd = -1; // fd of /dev/mixer
66	static sem_t audio_irq_done_sem; // Signal from interrupt to streaming thread: data block read
67	static bool sem_inited = false; // Flag: audio_irq_done_sem initialized
68	static int sound_buffer_size; // Size of sound buffer in bytes
69	static bool little_endian = false; // Flag: DSP accepts only little-endian 16-bit sound data
70	static pthread_t stream_thread; // Audio streaming thread
71	static pthread_attr_t stream_thread_attr; // Streaming thread attributes
72	static bool stream_thread_active = false; // Flag: streaming thread installed
73	static volatile bool stream_thread_cancel = false; // Flag: cancel streaming thread
74
75	// Prototypes
76	static void stream_func(void arg);
77
78
79	/*
80	* Initialization
81	*/
82
83	// Init using /dev/dsp, returns false on error
84	bool audio_init_dsp(void)
85	{
86	printf("Using " DSP_NAME " audio output\n");
87
88	// Get supported sample formats
89	unsigned long format;
90	ioctl(audio_fd, SNDCTL_DSP_GETFMTS, &format);
91	if ((format & (AFMT_U8 \| AFMT_S16_BE \| AFMT_S16_LE)) == 0) {
92	WarningAlert(GetString(STR_AUDIO_FORMAT_WARN));
93	close(audio_fd);
94	audio_fd = -1;
95	return false;
96	}
97	if (format & (AFMT_S16_BE \| AFMT_S16_LE))
98	audio_sample_sizes[0] = 16;
99	else
100	audio_sample_sizes[0] = 8;
101	if (!(format & AFMT_S16_BE))
102	little_endian = true;
103
104	// Set DSP parameters
105	format = AudioStatus.sample_size == 8 ? AFMT_U8 : (little_endian ? AFMT_S16_LE : AFMT_S16_BE);
106	ioctl(audio_fd, SNDCTL_DSP_SETFMT, &format);
107	int frag = 0x0004000c; // Block size: 4096 frames
108	ioctl(audio_fd, SNDCTL_DSP_SETFRAGMENT, &frag);
109	int stereo = (AudioStatus.channels == 2);
110	ioctl(audio_fd, SNDCTL_DSP_STEREO, &stereo);
111	int rate = AudioStatus.sample_rate >> 16;
112	ioctl(audio_fd, SNDCTL_DSP_SPEED, &rate);
113
114	// Get sound buffer size
115	ioctl(audio_fd, SNDCTL_DSP_GETBLKSIZE, &audio_frames_per_block);
116	D(bug("DSP_GETBLKSIZE %d\n", audio_frames_per_block));
117	sound_buffer_size = (AudioStatus.sample_size >> 3) * AudioStatus.channels * audio_frames_per_block;
118	return true;
119	}
120
121	// Init using ESD, returns false on error
122	bool audio_init_esd(void)
123	{
124	#if ENABLE_ESD
125	printf("Using ESD audio output\n");
126
127	// ESD audio format
128	esd_format_t format = ESD_STREAM \| ESD_PLAY;
129	if (AudioStatus.sample_size == 8)
130	format \|= ESD_BITS8;
131	else
132	format \|= ESD_BITS16;
133	if (AudioStatus.channels == 1)
134	format \|= ESD_MONO;
135	else
136	format \|= ESD_STEREO;
137
138	#if WORDS_BIGENDIAN
139	little_endian = false;
140	#else
141	little_endian = true;
142	#endif
143
144	// Open connection to ESD server
145	audio_fd = esd_play_stream(format, AudioStatus.sample_rate >> 16, NULL, NULL);
146	if (audio_fd < 0) {
147	char str[256];
148	sprintf(str, GetString(STR_NO_ESD_WARN), strerror(errno));
149	WarningAlert(str);
150	return false;
151	}
152
153	// Sound buffer size = 4096 frames
154	audio_frames_per_block = 4096;
155	sound_buffer_size = (AudioStatus.sample_size >> 3) * AudioStatus.channels * audio_frames_per_block;
156	return true;
157	#else
158	ErrorAlert("Basilisk II has been compiled with ESD support disabled.");
159	return false;
160	#endif
161	}
162
163	void AudioInit(void)
164	{
165	char str[256];
166
167	// Init audio status (defaults) and feature flags
168	AudioStatus.sample_rate = audio_sample_rates[0];
169	AudioStatus.sample_size = audio_sample_sizes[0];
170	AudioStatus.channels = audio_channel_counts[0];
171	AudioStatus.mixer = 0;
172	AudioStatus.num_sources = 0;
173	audio_component_flags = cmpWantsRegisterMessage \| kStereoOut \| k16BitOut;
174
175	// Sound disabled in prefs? Then do nothing
176	if (PrefsFindBool("nosound"))
177	return;
178
179	// Try to open /dev/dsp
180	audio_fd = open(DSP_NAME, O_WRONLY);
181	if (audio_fd < 0) {
182	#if ENABLE_ESD
183	if (!audio_init_esd())
184	return;
185	#else
186	sprintf(str, GetString(STR_NO_AUDIO_DEV_WARN), DSP_NAME, strerror(errno));
187	WarningAlert(str);
188	return;
189	#endif
190	} else
191	if (!audio_init_dsp())
192	return;
193
194	// Try to open /dev/mixer
195	mixer_fd = open("/dev/mixer", O_RDWR);
196	if (mixer_fd < 0)
197	printf("WARNING: Cannot open /dev/mixer (%s)", strerror(errno));
198
199	// Init semaphore
200	if (sem_init(&audio_irq_done_sem, 0, 0) < 0)
201	return;
202	sem_inited = true;
203
204	// Start streaming thread
205	pthread_attr_init(&stream_thread_attr);
206	#if defined(_POSIX_THREAD_PRIORITY_SCHEDULING)
207	if (geteuid() == 0) {
208	pthread_attr_setinheritsched(&stream_thread_attr, PTHREAD_EXPLICIT_SCHED);
209	pthread_attr_setschedpolicy(&stream_thread_attr, SCHED_FIFO);
210	struct sched_param fifo_param;
211	fifo_param.sched_priority = (sched_get_priority_min(SCHED_FIFO) + sched_get_priority_max(SCHED_FIFO)) / 2;
212	pthread_attr_setschedparam(&stream_thread_attr, &fifo_param);
213	}
214	#endif
215	stream_thread_active = (pthread_create(&stream_thread, &stream_thread_attr, stream_func, NULL) == 0);
216
217	// Everything OK
218	audio_open = true;
219	}
220
221
222	/*
223	* Deinitialization
224	*/
225
226	void AudioExit(void)
227	{
228	// Stop stream and delete semaphore
229	if (stream_thread_active) {
230	stream_thread_cancel = true;
231	#ifdef HAVE_PTHREAD_CANCEL
232	pthread_cancel(stream_thread);
233	#endif
234	pthread_join(stream_thread, NULL);
235	stream_thread_active = false;
236	}
237	if (sem_inited)
238	sem_destroy(&audio_irq_done_sem);
239
240	// Close /dev/dsp
241	if (audio_fd > 0)
242	close(audio_fd);
243
244	// Close /dev/mixer
245	if (mixer_fd > 0)
246	close(mixer_fd);
247	}
248
249
250	/*
251	* First source added, start audio stream
252	*/
253
254	void audio_enter_stream()
255	{
256	// Streaming thread is always running to avoid clicking noises
257	}
258
259
260	/*
261	* Last source removed, stop audio stream
262	*/
263
264	void audio_exit_stream()
265	{
266	// Streaming thread is always running to avoid clicking noises
267	}
268
269
270	/*
271	* Streaming function
272	*/
273
274	static uint32 apple_stream_info; // Mac address of SoundComponentData struct describing next buffer
275
276	static void stream_func(void arg)
277	{
278	int16 *silent_buffer = new int16[sound_buffer_size / 2];
279	int16 *last_buffer = new int16[sound_buffer_size / 2];
280	memset(silent_buffer, 0, sound_buffer_size);
281
282	while (!stream_thread_cancel) {
283	if (AudioStatus.num_sources) {
284
285	// Trigger audio interrupt to get new buffer
286	D(bug("stream: triggering irq\n"));
287	SetInterruptFlag(INTFLAG_AUDIO);
288	TriggerInterrupt();
289	D(bug("stream: waiting for ack\n"));
290	sem_wait(&audio_irq_done_sem);
291	D(bug("stream: ack received\n"));
292
293	// Get size of audio data
294	uint32 apple_stream_info = ReadMacInt32(audio_data + adatStreamInfo);
295	if (apple_stream_info) {
296	int work_size = ReadMacInt32(apple_stream_info + scd_sampleCount) * (AudioStatus.sample_size >> 3) * AudioStatus.channels;
297	D(bug("stream: work_size %d\n", work_size));
298	if (work_size > sound_buffer_size)
299	work_size = sound_buffer_size;
300	if (work_size == 0)
301	goto silence;
302
303	// Send data to DSP
304	if (work_size == sound_buffer_size && !little_endian)
305	write(audio_fd, Mac2HostAddr(ReadMacInt32(apple_stream_info + scd_buffer)), sound_buffer_size);
306	else {
307	// Last buffer or little-endian DSP
308	if (little_endian) {
309	int16 p = (int16 )Mac2HostAddr(ReadMacInt32(apple_stream_info + scd_buffer));
310	for (int i=0; i<work_size/2; i++)
311	last_buffer[i] = ntohs(p[i]);
312	} else
313	memcpy(last_buffer, Mac2HostAddr(ReadMacInt32(apple_stream_info + scd_buffer)), work_size);
314	memset((uint8 *)last_buffer + work_size, 0, sound_buffer_size - work_size);
315	write(audio_fd, last_buffer, sound_buffer_size);
316	}
317	D(bug("stream: data written\n"));
318	} else
319	goto silence;
320
321	} else {
322
323	// Audio not active, play silence
324	silence: write(audio_fd, silent_buffer, sound_buffer_size);
325	}
326	}
327	delete[] silent_buffer;
328	delete[] last_buffer;
329	return NULL;
330	}
331
332
333	/*
334	* MacOS audio interrupt, read next data block
335	*/
336
337	void AudioInterrupt(void)
338	{
339	D(bug("AudioInterrupt\n"));
340
341	// Get data from apple mixer
342	if (AudioStatus.mixer) {
343	M68kRegisters r;
344	r.a[0] = audio_data + adatStreamInfo;
345	r.a[1] = AudioStatus.mixer;
346	Execute68k(audio_data + adatGetSourceData, &r);
347	D(bug(" GetSourceData() returns %08lx\n", r.d[0]));
348	} else
349	WriteMacInt32(audio_data + adatStreamInfo, 0);
350
351	// Signal stream function
352	sem_post(&audio_irq_done_sem);
353	D(bug("AudioInterrupt done\n"));
354	}
355
356
357	/*
358	* Set sampling parameters
359	* "index" is an index into the audio_sample_rates[] etc. arrays
360	* It is guaranteed that AudioStatus.num_sources == 0
361	*/
362
363	void audio_set_sample_rate(int index)
364	{
365	}
366
367	void audio_set_sample_size(int index)
368	{
369	}
370
371	void audio_set_channels(int index)
372	{
373	}
374
375
376	/*
377	* Get/set volume controls (volume values received/returned have the left channel
378	* volume in the upper 16 bits and the right channel volume in the lower 16 bits;
379	* both volumes are 8.8 fixed point values with 0x0100 meaning "maximum volume"))
380	*/
381
382	bool audio_get_main_mute(void)
383	{
384	return false;
385	}
386
387	uint32 audio_get_main_volume(void)
388	{
389	if (mixer_fd >= 0) {
390	int vol;
391	if (ioctl(mixer_fd, SOUND_MIXER_READ_PCM, &vol) == 0) {
392	int left = vol >> 8;
393	int right = vol & 0xff;
394	return ((left * 256 / 100) << 16) \| (right * 256 / 100);
395	}
396	}
397	return 0x01000100;
398	}
399
400	bool audio_get_speaker_mute(void)
401	{
402	return false;
403	}
404
405	uint32 audio_get_speaker_volume(void)
406	{
407	if (mixer_fd >= 0) {
408	int vol;
409	if (ioctl(mixer_fd, SOUND_MIXER_READ_VOLUME, &vol) == 0) {
410	int left = vol >> 8;
411	int right = vol & 0xff;
412	return ((left * 256 / 100) << 16) \| (right * 256 / 100);
413	}
414	}
415	return 0x01000100;
416	}
417
418	void audio_set_main_mute(bool mute)
419	{
420	}
421
422	void audio_set_main_volume(uint32 vol)
423	{
424	if (mixer_fd >= 0) {
425	int left = vol >> 16;
426	int right = vol & 0xffff;
427	int p = ((left * 100 / 256) << 8) \| (right * 100 / 256);
428	ioctl(mixer_fd, SOUND_MIXER_WRITE_PCM, &p);
429	}
430	}
431
432	void audio_set_speaker_mute(bool mute)
433	{
434	}
435
436	void audio_set_speaker_volume(uint32 vol)
437	{
438	if (mixer_fd >= 0) {
439	int left = vol >> 16;
440	int right = vol & 0xffff;
441	int p = ((left * 100 / 256) << 8) \| (right * 100 / 256);
442	ioctl(mixer_fd, SOUND_MIXER_WRITE_VOLUME, &p);
443	}
444	}