src/Unix/audio_oss_esd.cpp

/*
 *  audio_oss_esd.cpp - Audio support, implementation for OSS and ESD (Linux and FreeBSD)
 *
 *  Basilisk II (C) 1997-2002 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 <sys/soundcard.h>
#endif

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

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

#define DEBUG 0
#include "debug.h"


// The currently selected audio parameters (indices in audio_sample_rates[] etc. vectors)
static int audio_sample_rate_index = 0;
static int audio_sample_size_index = 0;
static int audio_channel_count_index = 0;

// 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 uint8 silence_byte;                                                      // Byte value to use to fill sound buffers with silence
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
 */

// Set AudioStatus to reflect current audio stream format
static void set_audio_status_format(void)
{
        AudioStatus.sample_rate = audio_sample_rates[audio_sample_rate_index];
        AudioStatus.sample_size = audio_sample_sizes[audio_sample_size_index];
        AudioStatus.channels = audio_channel_counts[audio_channel_count_index];
}

// Init using /dev/dsp, returns false on error
static bool open_dsp(void)
{
        // Open /dev/dsp
        audio_fd = open(DSP_NAME, O_WRONLY);
        if (audio_fd < 0) {
                fprintf(stderr, "WARNING: Cannot open %s (%s)\n", DSP_NAME, strerror(errno));
                return false;
        }

        printf("Using " DSP_NAME " audio output\n");

        // Get supported sample formats
        if (audio_sample_sizes.empty()) {
                unsigned long format;
                ioctl(audio_fd, SNDCTL_DSP_GETFMTS, &format);
                if (format & AFMT_U8)
                        audio_sample_sizes.push_back(8);
                if (format & (AFMT_S16_BE | AFMT_S16_LE))
                        audio_sample_sizes.push_back(16);

                int stereo = 0;
                if (ioctl(audio_fd, SNDCTL_DSP_STEREO, &stereo) == 0 && stereo == 0)
                        audio_channel_counts.push_back(1);
                stereo = 1;
                if (ioctl(audio_fd, SNDCTL_DSP_STEREO, &stereo) == 0 && stereo == 1)
                        audio_channel_counts.push_back(2);

                if (audio_sample_sizes.empty() || audio_channel_counts.empty()) {
                        WarningAlert(GetString(STR_AUDIO_FORMAT_WARN));
                        close(audio_fd);
                        audio_fd = -1;
                        return false;
                }

                audio_sample_rates.push_back(11025 << 16);
                audio_sample_rates.push_back(22050 << 16);
                int rate = 44100;
                ioctl(audio_fd, SNDCTL_DSP_SPEED, &rate);
                if (rate > 22050)
                        audio_sample_rates.push_back(rate << 16);

                // Default to highest supported values
                audio_sample_rate_index = audio_sample_rates.size() - 1;
                audio_sample_size_index = audio_sample_sizes.size() - 1;
                audio_channel_count_index = audio_channel_counts.size() - 1;
        }

        // Set DSP parameters
        unsigned long format;
        if (audio_sample_sizes[audio_sample_size_index] == 8) {
                format = AFMT_U8;
                little_endian = false;
                silence_byte = 0x80;
        } else {
                unsigned long sup_format;
                ioctl(audio_fd, SNDCTL_DSP_GETFMTS, &sup_format);
                if (sup_format & AFMT_S16_BE) {
                        little_endian = false;
                        format = AFMT_S16_BE;
                } else {
                        little_endian = true;
                        format = AFMT_S16_LE;
                }
                silence_byte = 0;
        }
        ioctl(audio_fd, SNDCTL_DSP_SETFMT, &format);
        int frag = 0x0004000c;          // Block size: 4096 frames
        ioctl(audio_fd, SNDCTL_DSP_SETFRAGMENT, &frag);
        int stereo = (audio_channel_counts[audio_channel_count_index] == 2);
        ioctl(audio_fd, SNDCTL_DSP_STEREO, &stereo);
        int rate = audio_sample_rates[audio_sample_rate_index] >> 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));
        return true;
}

// Init using ESD, returns false on error
static bool open_esd(void)
{
#ifdef ENABLE_ESD
        int rate;
        esd_format_t format = ESD_STREAM | ESD_PLAY;

        if (audio_sample_sizes.empty()) {

                // Default values
                rate = 44100;
                format |= (ESD_BITS16 | ESD_STEREO);

        } else {

                rate = audio_sample_rates[audio_sample_rate_index] >> 16;
                if (audio_sample_sizes[audio_sample_size_index] == 8)
                        format |= ESD_BITS8;
                else
                        format |= ESD_BITS16;
                if (audio_channel_counts[audio_channel_count_index] == 1)
                        format |= ESD_MONO;
                else
                        format |= ESD_STEREO;
        }

#if WORDS_BIGENDIAN
        little_endian = false;
#else
        little_endian = true;
#endif
        silence_byte = 0;       // Is this correct for 8-bit mode?

        // Open connection to ESD server
        audio_fd = esd_play_stream(format, rate, NULL, NULL);
        if (audio_fd < 0) {
                fprintf(stderr, "WARNING: Cannot open ESD connection\n");
                return false;
        }

        printf("Using ESD audio output\n");

        // ESD supports a variety of twisted little audio formats, all different
        if (audio_sample_sizes.empty()) {

                // The reason we do this here is that we don't want to add sample
                // rates etc. unless the ESD server connection could be opened
                // (if ESD fails, /dev/dsp might be tried next)
                audio_sample_rates.push_back(11025 << 16);
                audio_sample_rates.push_back(22050 << 16);
                audio_sample_rates.push_back(44100 << 16);
                audio_sample_sizes.push_back(8);
                audio_sample_sizes.push_back(16);
                audio_channel_counts.push_back(1);
                audio_channel_counts.push_back(2);

                // Default to highest supported values
                audio_sample_rate_index = audio_sample_rates.size() - 1;
                audio_sample_size_index = audio_sample_sizes.size() - 1;
                audio_channel_count_index = audio_channel_counts.size() - 1;
        }

        // Sound buffer size = 4096 frames
        audio_frames_per_block = 4096;
        return true;
#else
        // ESD is not enabled, shut up the compiler
        return false;
#endif
}

static bool open_audio(void)
{
#ifdef ENABLE_ESD
        // If ESPEAKER is set, the user probably wants to use ESD, so try that first
        if (getenv("ESPEAKER"))
                if (open_esd())
                        goto dev_opened;
#endif

        // Try to open /dev/dsp
        if (open_dsp())
                goto dev_opened;

#ifdef ENABLE_ESD
        // Hm, /dev/dsp failed so we try ESD again if ESPEAKER wasn't set
        if (!getenv("ESPEAKER"))
                if (open_esd())
                        goto dev_opened;
#endif

        // No audio device succeeded
        WarningAlert(GetString(STR_NO_AUDIO_WARN));
        return false;

        // Device opened, set AudioStatus
dev_opened:
        sound_buffer_size = (audio_sample_sizes[audio_sample_size_index] >> 3) * audio_channel_counts[audio_channel_count_index] * audio_frames_per_block;
        set_audio_status_format();

        // Start streaming thread
        Set_pthread_attr(&stream_thread_attr, 0);
        stream_thread_active = (pthread_create(&stream_thread, &stream_thread_attr, stream_func, NULL) == 0);

        // Everything went fine
        audio_open = true;
        return true;
}

void AudioInit(void)
{
        // Init audio status (reasonable defaults) and feature flags
        AudioStatus.sample_rate = 44100 << 16;
        AudioStatus.sample_size = 16;
        AudioStatus.channels = 2;
        AudioStatus.mixer = 0;
        AudioStatus.num_sources = 0;
        audio_component_flags = cmpWantsRegisterMessage | kStereoOut | k16BitOut;

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

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

        // 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));

        // Open and initialize audio device
        open_audio();
}


/*
 *  Deinitialization
 */

static void close_audio(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;
        }

        // Close /dev/dsp or ESD socket
        if (audio_fd >= 0) {
                close(audio_fd);
                audio_fd = -1;
        }

        audio_open = false;
}

void AudioExit(void)
{
        // Close audio device
        close_audio();

        // Delete semaphore
        if (sem_inited) {
                sem_destroy(&audio_irq_done_sem);
                sem_inited = false;
        }

        // Close /dev/mixer
        if (mixer_fd >= 0) {
                close(mixer_fd);
                mixer_fd = -1;
        }
}


/*
 *  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 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, silence_byte, 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
                                                Mac2Host_memcpy(last_buffer, ReadMacInt32(apple_stream_info + scd_buffer), work_size);
                                        memset((uint8 *)last_buffer + work_size, silence_byte, 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. vectors
 *  It is guaranteed that AudioStatus.num_sources == 0
 */

bool audio_set_sample_rate(int index)
{
        close_audio();
        audio_sample_rate_index = index;
        return open_audio();
}

bool audio_set_sample_size(int index)
{
        close_audio();
        audio_sample_size_index = index;
        return open_audio();
}

bool audio_set_channels(int index)
{
        close_audio();
        audio_channel_count_index = index;
        return open_audio();
}


/*
 *  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:	1.14
Committed:	2002-10-03T15:47:59Z (21 years, 8 months ago) by gbeauche
Branch:	MAIN
Changes since 1.13:	+1 -1 lines
Log Message:	B2 maintainer for FreeBSD reported <sys/soundcard.h> is the one to use in all recent versions of FreeBSD.
#	Content
1	/*
2	* audio_oss_esd.cpp - Audio support, implementation for OSS and ESD (Linux and FreeBSD)
3	*
4	* Basilisk II (C) 1997-2002 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 <sys/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	#ifdef ENABLE_ESD
45	#include <esd.h>
46	#endif
47
48	#define DEBUG 0
49	#include "debug.h"
50
51
52	// The currently selected audio parameters (indices in audio_sample_rates[] etc. vectors)
53	static int audio_sample_rate_index = 0;
54	static int audio_sample_size_index = 0;
55	static int audio_channel_count_index = 0;
56
57	// Constants
58	#define DSP_NAME "/dev/dsp"
59
60	// Global variables
61	static int audio_fd = -1; // fd of /dev/dsp or ESD
62	static int mixer_fd = -1; // fd of /dev/mixer
63	static sem_t audio_irq_done_sem; // Signal from interrupt to streaming thread: data block read
64	static bool sem_inited = false; // Flag: audio_irq_done_sem initialized
65	static int sound_buffer_size; // Size of sound buffer in bytes
66	static bool little_endian = false; // Flag: DSP accepts only little-endian 16-bit sound data
67	static uint8 silence_byte; // Byte value to use to fill sound buffers with silence
68	static pthread_t stream_thread; // Audio streaming thread
69	static pthread_attr_t stream_thread_attr; // Streaming thread attributes
70	static bool stream_thread_active = false; // Flag: streaming thread installed
71	static volatile bool stream_thread_cancel = false; // Flag: cancel streaming thread
72
73	// Prototypes
74	static void stream_func(void arg);
75
76
77	/*
78	* Initialization
79	*/
80
81	// Set AudioStatus to reflect current audio stream format
82	static void set_audio_status_format(void)
83	{
84	AudioStatus.sample_rate = audio_sample_rates[audio_sample_rate_index];
85	AudioStatus.sample_size = audio_sample_sizes[audio_sample_size_index];
86	AudioStatus.channels = audio_channel_counts[audio_channel_count_index];
87	}
88
89	// Init using /dev/dsp, returns false on error
90	static bool open_dsp(void)
91	{
92	// Open /dev/dsp
93	audio_fd = open(DSP_NAME, O_WRONLY);
94	if (audio_fd < 0) {
95	fprintf(stderr, "WARNING: Cannot open %s (%s)\n", DSP_NAME, strerror(errno));
96	return false;
97	}
98
99	printf("Using " DSP_NAME " audio output\n");
100
101	// Get supported sample formats
102	if (audio_sample_sizes.empty()) {
103	unsigned long format;
104	ioctl(audio_fd, SNDCTL_DSP_GETFMTS, &format);
105	if (format & AFMT_U8)
106	audio_sample_sizes.push_back(8);
107	if (format & (AFMT_S16_BE \| AFMT_S16_LE))
108	audio_sample_sizes.push_back(16);
109
110	int stereo = 0;
111	if (ioctl(audio_fd, SNDCTL_DSP_STEREO, &stereo) == 0 && stereo == 0)
112	audio_channel_counts.push_back(1);
113	stereo = 1;
114	if (ioctl(audio_fd, SNDCTL_DSP_STEREO, &stereo) == 0 && stereo == 1)
115	audio_channel_counts.push_back(2);
116
117	if (audio_sample_sizes.empty() \|\| audio_channel_counts.empty()) {
118	WarningAlert(GetString(STR_AUDIO_FORMAT_WARN));
119	close(audio_fd);
120	audio_fd = -1;
121	return false;
122	}
123
124	audio_sample_rates.push_back(11025 << 16);
125	audio_sample_rates.push_back(22050 << 16);
126	int rate = 44100;
127	ioctl(audio_fd, SNDCTL_DSP_SPEED, &rate);
128	if (rate > 22050)
129	audio_sample_rates.push_back(rate << 16);
130
131	// Default to highest supported values
132	audio_sample_rate_index = audio_sample_rates.size() - 1;
133	audio_sample_size_index = audio_sample_sizes.size() - 1;
134	audio_channel_count_index = audio_channel_counts.size() - 1;
135	}
136
137	// Set DSP parameters
138	unsigned long format;
139	if (audio_sample_sizes[audio_sample_size_index] == 8) {
140	format = AFMT_U8;
141	little_endian = false;
142	silence_byte = 0x80;
143	} else {
144	unsigned long sup_format;
145	ioctl(audio_fd, SNDCTL_DSP_GETFMTS, &sup_format);
146	if (sup_format & AFMT_S16_BE) {
147	little_endian = false;
148	format = AFMT_S16_BE;
149	} else {
150	little_endian = true;
151	format = AFMT_S16_LE;
152	}
153	silence_byte = 0;
154	}
155	ioctl(audio_fd, SNDCTL_DSP_SETFMT, &format);
156	int frag = 0x0004000c; // Block size: 4096 frames
157	ioctl(audio_fd, SNDCTL_DSP_SETFRAGMENT, &frag);
158	int stereo = (audio_channel_counts[audio_channel_count_index] == 2);
159	ioctl(audio_fd, SNDCTL_DSP_STEREO, &stereo);
160	int rate = audio_sample_rates[audio_sample_rate_index] >> 16;
161	ioctl(audio_fd, SNDCTL_DSP_SPEED, &rate);
162
163	// Get sound buffer size
164	ioctl(audio_fd, SNDCTL_DSP_GETBLKSIZE, &audio_frames_per_block);
165	D(bug("DSP_GETBLKSIZE %d\n", audio_frames_per_block));
166	return true;
167	}
168
169	// Init using ESD, returns false on error
170	static bool open_esd(void)
171	{
172	#ifdef ENABLE_ESD
173	int rate;
174	esd_format_t format = ESD_STREAM \| ESD_PLAY;
175
176	if (audio_sample_sizes.empty()) {
177
178	// Default values
179	rate = 44100;
180	format \|= (ESD_BITS16 \| ESD_STEREO);
181
182	} else {
183
184	rate = audio_sample_rates[audio_sample_rate_index] >> 16;
185	if (audio_sample_sizes[audio_sample_size_index] == 8)
186	format \|= ESD_BITS8;
187	else
188	format \|= ESD_BITS16;
189	if (audio_channel_counts[audio_channel_count_index] == 1)
190	format \|= ESD_MONO;
191	else
192	format \|= ESD_STEREO;
193	}
194
195	#if WORDS_BIGENDIAN
196	little_endian = false;
197	#else
198	little_endian = true;
199	#endif
200	silence_byte = 0; // Is this correct for 8-bit mode?
201
202	// Open connection to ESD server
203	audio_fd = esd_play_stream(format, rate, NULL, NULL);
204	if (audio_fd < 0) {
205	fprintf(stderr, "WARNING: Cannot open ESD connection\n");
206	return false;
207	}
208
209	printf("Using ESD audio output\n");
210
211	// ESD supports a variety of twisted little audio formats, all different
212	if (audio_sample_sizes.empty()) {
213
214	// The reason we do this here is that we don't want to add sample
215	// rates etc. unless the ESD server connection could be opened
216	// (if ESD fails, /dev/dsp might be tried next)
217	audio_sample_rates.push_back(11025 << 16);
218	audio_sample_rates.push_back(22050 << 16);
219	audio_sample_rates.push_back(44100 << 16);
220	audio_sample_sizes.push_back(8);
221	audio_sample_sizes.push_back(16);
222	audio_channel_counts.push_back(1);
223	audio_channel_counts.push_back(2);
224
225	// Default to highest supported values
226	audio_sample_rate_index = audio_sample_rates.size() - 1;
227	audio_sample_size_index = audio_sample_sizes.size() - 1;
228	audio_channel_count_index = audio_channel_counts.size() - 1;
229	}
230
231	// Sound buffer size = 4096 frames
232	audio_frames_per_block = 4096;
233	return true;
234	#else
235	// ESD is not enabled, shut up the compiler
236	return false;
237	#endif
238	}
239
240	static bool open_audio(void)
241	{
242	#ifdef ENABLE_ESD
243	// If ESPEAKER is set, the user probably wants to use ESD, so try that first
244	if (getenv("ESPEAKER"))
245	if (open_esd())
246	goto dev_opened;
247	#endif
248
249	// Try to open /dev/dsp
250	if (open_dsp())
251	goto dev_opened;
252
253	#ifdef ENABLE_ESD
254	// Hm, /dev/dsp failed so we try ESD again if ESPEAKER wasn't set
255	if (!getenv("ESPEAKER"))
256	if (open_esd())
257	goto dev_opened;
258	#endif
259
260	// No audio device succeeded
261	WarningAlert(GetString(STR_NO_AUDIO_WARN));
262	return false;
263
264	// Device opened, set AudioStatus
265	dev_opened:
266	sound_buffer_size = (audio_sample_sizes[audio_sample_size_index] >> 3) * audio_channel_counts[audio_channel_count_index] * audio_frames_per_block;
267	set_audio_status_format();
268
269	// Start streaming thread
270	Set_pthread_attr(&stream_thread_attr, 0);
271	stream_thread_active = (pthread_create(&stream_thread, &stream_thread_attr, stream_func, NULL) == 0);
272
273	// Everything went fine
274	audio_open = true;
275	return true;
276	}
277
278	void AudioInit(void)
279	{
280	// Init audio status (reasonable defaults) and feature flags
281	AudioStatus.sample_rate = 44100 << 16;
282	AudioStatus.sample_size = 16;
283	AudioStatus.channels = 2;
284	AudioStatus.mixer = 0;
285	AudioStatus.num_sources = 0;
286	audio_component_flags = cmpWantsRegisterMessage \| kStereoOut \| k16BitOut;
287
288	// Sound disabled in prefs? Then do nothing
289	if (PrefsFindBool("nosound"))
290	return;
291
292	// Init semaphore
293	if (sem_init(&audio_irq_done_sem, 0, 0) < 0)
294	return;
295	sem_inited = true;
296
297	// Try to open /dev/mixer
298	mixer_fd = open("/dev/mixer", O_RDWR);
299	if (mixer_fd < 0)
300	printf("WARNING: Cannot open /dev/mixer (%s)", strerror(errno));
301
302	// Open and initialize audio device
303	open_audio();
304	}
305
306
307	/*
308	* Deinitialization
309	*/
310
311	static void close_audio(void)
312	{
313	// Stop stream and delete semaphore
314	if (stream_thread_active) {
315	stream_thread_cancel = true;
316	#ifdef HAVE_PTHREAD_CANCEL
317	pthread_cancel(stream_thread);
318	#endif
319	pthread_join(stream_thread, NULL);
320	stream_thread_active = false;
321	}
322
323	// Close /dev/dsp or ESD socket
324	if (audio_fd >= 0) {
325	close(audio_fd);
326	audio_fd = -1;
327	}
328
329	audio_open = false;
330	}
331
332	void AudioExit(void)
333	{
334	// Close audio device
335	close_audio();
336
337	// Delete semaphore
338	if (sem_inited) {
339	sem_destroy(&audio_irq_done_sem);
340	sem_inited = false;
341	}
342
343	// Close /dev/mixer
344	if (mixer_fd >= 0) {
345	close(mixer_fd);
346	mixer_fd = -1;
347	}
348	}
349
350
351	/*
352	* First source added, start audio stream
353	*/
354
355	void audio_enter_stream()
356	{
357	// Streaming thread is always running to avoid clicking noises
358	}
359
360
361	/*
362	* Last source removed, stop audio stream
363	*/
364
365	void audio_exit_stream()
366	{
367	// Streaming thread is always running to avoid clicking noises
368	}
369
370
371	/*
372	* Streaming function
373	*/
374
375	static void stream_func(void arg)
376	{
377	int16 *silent_buffer = new int16[sound_buffer_size / 2];
378	int16 *last_buffer = new int16[sound_buffer_size / 2];
379	memset(silent_buffer, silence_byte, sound_buffer_size);
380
381	while (!stream_thread_cancel) {
382	if (AudioStatus.num_sources) {
383
384	// Trigger audio interrupt to get new buffer
385	D(bug("stream: triggering irq\n"));
386	SetInterruptFlag(INTFLAG_AUDIO);
387	TriggerInterrupt();
388	D(bug("stream: waiting for ack\n"));
389	sem_wait(&audio_irq_done_sem);
390	D(bug("stream: ack received\n"));
391
392	// Get size of audio data
393	uint32 apple_stream_info = ReadMacInt32(audio_data + adatStreamInfo);
394	if (apple_stream_info) {
395	int work_size = ReadMacInt32(apple_stream_info + scd_sampleCount) * (AudioStatus.sample_size >> 3) * AudioStatus.channels;
396	D(bug("stream: work_size %d\n", work_size));
397	if (work_size > sound_buffer_size)
398	work_size = sound_buffer_size;
399	if (work_size == 0)
400	goto silence;
401
402	// Send data to DSP
403	if (work_size == sound_buffer_size && !little_endian)
404	write(audio_fd, Mac2HostAddr(ReadMacInt32(apple_stream_info + scd_buffer)), sound_buffer_size);
405	else {
406	// Last buffer or little-endian DSP
407	if (little_endian) {
408	int16 p = (int16 )Mac2HostAddr(ReadMacInt32(apple_stream_info + scd_buffer));
409	for (int i=0; i<work_size/2; i++)
410	last_buffer[i] = ntohs(p[i]);
411	} else
412	Mac2Host_memcpy(last_buffer, ReadMacInt32(apple_stream_info + scd_buffer), work_size);
413	memset((uint8 *)last_buffer + work_size, silence_byte, sound_buffer_size - work_size);
414	write(audio_fd, last_buffer, sound_buffer_size);
415	}
416	D(bug("stream: data written\n"));
417	} else
418	goto silence;
419
420	} else {
421
422	// Audio not active, play silence
423	silence: write(audio_fd, silent_buffer, sound_buffer_size);
424	}
425	}
426	delete[] silent_buffer;
427	delete[] last_buffer;
428	return NULL;
429	}
430
431
432	/*
433	* MacOS audio interrupt, read next data block
434	*/
435
436	void AudioInterrupt(void)
437	{
438	D(bug("AudioInterrupt\n"));
439
440	// Get data from apple mixer
441	if (AudioStatus.mixer) {
442	M68kRegisters r;
443	r.a[0] = audio_data + adatStreamInfo;
444	r.a[1] = AudioStatus.mixer;
445	Execute68k(audio_data + adatGetSourceData, &r);
446	D(bug(" GetSourceData() returns %08lx\n", r.d[0]));
447	} else
448	WriteMacInt32(audio_data + adatStreamInfo, 0);
449
450	// Signal stream function
451	sem_post(&audio_irq_done_sem);
452	D(bug("AudioInterrupt done\n"));
453	}
454
455
456	/*
457	* Set sampling parameters
458	* "index" is an index into the audio_sample_rates[] etc. vectors
459	* It is guaranteed that AudioStatus.num_sources == 0
460	*/
461
462	bool audio_set_sample_rate(int index)
463	{
464	close_audio();
465	audio_sample_rate_index = index;
466	return open_audio();
467	}
468
469	bool audio_set_sample_size(int index)
470	{
471	close_audio();
472	audio_sample_size_index = index;
473	return open_audio();
474	}
475
476	bool audio_set_channels(int index)
477	{
478	close_audio();
479	audio_channel_count_index = index;
480	return open_audio();
481	}
482
483
484	/*
485	* Get/set volume controls (volume values received/returned have the left channel
486	* volume in the upper 16 bits and the right channel volume in the lower 16 bits;
487	* both volumes are 8.8 fixed point values with 0x0100 meaning "maximum volume"))
488	*/
489
490	bool audio_get_main_mute(void)
491	{
492	return false;
493	}
494
495	uint32 audio_get_main_volume(void)
496	{
497	if (mixer_fd >= 0) {
498	int vol;
499	if (ioctl(mixer_fd, SOUND_MIXER_READ_PCM, &vol) == 0) {
500	int left = vol >> 8;
501	int right = vol & 0xff;
502	return ((left * 256 / 100) << 16) \| (right * 256 / 100);
503	}
504	}
505	return 0x01000100;
506	}
507
508	bool audio_get_speaker_mute(void)
509	{
510	return false;
511	}
512
513	uint32 audio_get_speaker_volume(void)
514	{
515	if (mixer_fd >= 0) {
516	int vol;
517	if (ioctl(mixer_fd, SOUND_MIXER_READ_VOLUME, &vol) == 0) {
518	int left = vol >> 8;
519	int right = vol & 0xff;
520	return ((left * 256 / 100) << 16) \| (right * 256 / 100);
521	}
522	}
523	return 0x01000100;
524	}
525
526	void audio_set_main_mute(bool mute)
527	{
528	}
529
530	void audio_set_main_volume(uint32 vol)
531	{
532	if (mixer_fd >= 0) {
533	int left = vol >> 16;
534	int right = vol & 0xffff;
535	int p = ((left * 100 / 256) << 8) \| (right * 100 / 256);
536	ioctl(mixer_fd, SOUND_MIXER_WRITE_PCM, &p);
537	}
538	}
539
540	void audio_set_speaker_mute(bool mute)
541	{
542	}
543
544	void audio_set_speaker_volume(uint32 vol)
545	{
546	if (mixer_fd >= 0) {
547	int left = vol >> 16;
548	int right = vol & 0xffff;
549	int p = ((left * 100 / 256) << 8) \| (right * 100 / 256);
550	ioctl(mixer_fd, SOUND_MIXER_WRITE_VOLUME, &p);
551	}
552	}