src/SDL/audio_sdl.cpp

/*
 *  audio_sdl.cpp - Audio support, SDL implementation
 *
 *  Basilisk II (C) 1997-2008 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 "cpu_emulation.h"
#include "main.h"
#include "prefs.h"
#include "user_strings.h"
#include "audio.h"
#include "audio_defs.h"

#include <SDL_mutex.h>
#include <SDL_audio.h>

#define DEBUG 0
#include "debug.h"

#if defined(BINCUE)
#include "bincue_unix.h"
#endif


// 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;

// Global variables
static SDL_sem *audio_irq_done_sem = NULL;                      // Signal from interrupt to streaming thread: data block read
static uint8 silence_byte;                                                      // Byte value to use to fill sound buffers with silence

// Prototypes
static void stream_func(void *arg, uint8 *stream, int stream_len);


/*
 *  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 SDL audio system
static bool open_sdl_audio(void)
{
        // SDL supports a variety of twisted little audio formats, all different
        if (audio_sample_sizes.empty()) {
                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;
        }

        SDL_AudioSpec audio_spec;
        audio_spec.freq = audio_sample_rates[audio_sample_rate_index] >> 16;
        audio_spec.format = (audio_sample_sizes[audio_sample_size_index] == 8) ? AUDIO_U8 : AUDIO_S16MSB;
        audio_spec.channels = audio_channel_counts[audio_channel_count_index];
        audio_spec.samples = 4096;
        audio_spec.callback = stream_func;
        audio_spec.userdata = NULL;

        // Open the audio device, forcing the desired format
        if (SDL_OpenAudio(&audio_spec, NULL) < 0) {
                fprintf(stderr, "WARNING: Cannot open audio: %s\n", SDL_GetError());
                return false;
        }

#if defined(BINCUE)
        OpenAudio_bincue(audio_spec.freq, audio_spec.format, audio_spec.channels,
        audio_spec.silence);
#endif

        char driver_name[32];
        printf("Using SDL/%s audio output\n", SDL_AudioDriverName(driver_name, sizeof(driver_name) - 1));
        silence_byte = audio_spec.silence;
        SDL_PauseAudio(0);

        // Sound buffer size = 4096 frames
        audio_frames_per_block = audio_spec.samples;
        return true;
}

static bool open_audio(void)
{
        // Try to open SDL audio
        if (!open_sdl_audio()) {
                WarningAlert(GetString(STR_NO_AUDIO_WARN));
                return false;
        }

        // Device opened, set AudioStatus
        set_audio_status_format();

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

void AudioInit(void)
{
        // Init audio status 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
        audio_irq_done_sem = SDL_CreateSemaphore(0);

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


/*
 *  Deinitialization
 */

static void close_audio(void)
{
        // Close audio device
        SDL_CloseAudio();
        audio_open = false;
}

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

        // Delete semaphore
        if (audio_irq_done_sem)
                SDL_DestroySemaphore(audio_irq_done_sem);
}


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

void audio_enter_stream()
{
}


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

void audio_exit_stream()
{
}


/*
 *  Streaming function
 */

static void stream_func(void *arg, uint8 *stream, int stream_len)
{
        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"));
                SDL_SemWait(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 > stream_len)
                                work_size = stream_len;
                        if (work_size == 0)
                                goto silence;

                        // Send data to audio device
                        Mac2Host_memcpy(stream, ReadMacInt32(apple_stream_info + scd_buffer), work_size);
                        if (work_size != stream_len)
                                memset((uint8 *)stream + work_size, silence_byte, stream_len - work_size);
                        D(bug("stream: data written\n"));
                } else
                        goto silence;

        } else {

                // Audio not active, play silence
silence: memset(stream, silence_byte, stream_len);
        }
#if defined(BINCUE)
        MixAudio_bincue(stream, stream_len);
#endif
}


/*
 *  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
        SDL_SemPost(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)
{
        return 0x01000100;
}

bool audio_get_speaker_mute(void)
{
        return false;
}

uint32 audio_get_speaker_volume(void)
{
        return 0x01000100;
}

void audio_set_main_mute(bool mute)
{
}

void audio_set_main_volume(uint32 vol)
{
}

void audio_set_speaker_mute(bool mute)
{
}

void audio_set_speaker_volume(uint32 vol)
{
}
Revision:	1.6
Committed:	2010-10-06T00:30:23Z (14 years, 1 month ago) by asvitkine
Branch:	MAIN
CVS Tags:	HEAD
Changes since 1.5:	+12 -0 lines
Log Message:	[Geoffrey Brown] Add bin/cue support. The following should work: 1) Basilisk and SheepShaver with sdl-audio and bincue on linux and os x 2) SheepShaver with bincue and core audio on os x
#	Content
1	/*
2	* audio_sdl.cpp - Audio support, SDL implementation
3	*
4	* Basilisk II (C) 1997-2008 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	#include "cpu_emulation.h"
23	#include "main.h"
24	#include "prefs.h"
25	#include "user_strings.h"
26	#include "audio.h"
27	#include "audio_defs.h"
28
29	#include <SDL_mutex.h>
30	#include <SDL_audio.h>
31
32	#define DEBUG 0
33	#include "debug.h"
34
35	#if defined(BINCUE)
36	#include "bincue_unix.h"
37	#endif
38
39
40	// The currently selected audio parameters (indices in audio_sample_rates[] etc. vectors)
41	static int audio_sample_rate_index = 0;
42	static int audio_sample_size_index = 0;
43	static int audio_channel_count_index = 0;
44
45	// Global variables
46	static SDL_sem *audio_irq_done_sem = NULL; // Signal from interrupt to streaming thread: data block read
47	static uint8 silence_byte; // Byte value to use to fill sound buffers with silence
48
49	// Prototypes
50	static void stream_func(void arg, uint8 stream, int stream_len);
51
52
53	/*
54	* Initialization
55	*/
56
57	// Set AudioStatus to reflect current audio stream format
58	static void set_audio_status_format(void)
59	{
60	AudioStatus.sample_rate = audio_sample_rates[audio_sample_rate_index];
61	AudioStatus.sample_size = audio_sample_sizes[audio_sample_size_index];
62	AudioStatus.channels = audio_channel_counts[audio_channel_count_index];
63	}
64
65	// Init SDL audio system
66	static bool open_sdl_audio(void)
67	{
68	// SDL supports a variety of twisted little audio formats, all different
69	if (audio_sample_sizes.empty()) {
70	audio_sample_rates.push_back(11025 << 16);
71	audio_sample_rates.push_back(22050 << 16);
72	audio_sample_rates.push_back(44100 << 16);
73	audio_sample_sizes.push_back(8);
74	audio_sample_sizes.push_back(16);
75	audio_channel_counts.push_back(1);
76	audio_channel_counts.push_back(2);
77
78	// Default to highest supported values
79	audio_sample_rate_index = audio_sample_rates.size() - 1;
80	audio_sample_size_index = audio_sample_sizes.size() - 1;
81	audio_channel_count_index = audio_channel_counts.size() - 1;
82	}
83
84	SDL_AudioSpec audio_spec;
85	audio_spec.freq = audio_sample_rates[audio_sample_rate_index] >> 16;
86	audio_spec.format = (audio_sample_sizes[audio_sample_size_index] == 8) ? AUDIO_U8 : AUDIO_S16MSB;
87	audio_spec.channels = audio_channel_counts[audio_channel_count_index];
88	audio_spec.samples = 4096;
89	audio_spec.callback = stream_func;
90	audio_spec.userdata = NULL;
91
92	// Open the audio device, forcing the desired format
93	if (SDL_OpenAudio(&audio_spec, NULL) < 0) {
94	fprintf(stderr, "WARNING: Cannot open audio: %s\n", SDL_GetError());
95	return false;
96	}
97
98	#if defined(BINCUE)
99	OpenAudio_bincue(audio_spec.freq, audio_spec.format, audio_spec.channels,
100	audio_spec.silence);
101	#endif
102
103	char driver_name[32];
104	printf("Using SDL/%s audio output\n", SDL_AudioDriverName(driver_name, sizeof(driver_name) - 1));
105	silence_byte = audio_spec.silence;
106	SDL_PauseAudio(0);
107
108	// Sound buffer size = 4096 frames
109	audio_frames_per_block = audio_spec.samples;
110	return true;
111	}
112
113	static bool open_audio(void)
114	{
115	// Try to open SDL audio
116	if (!open_sdl_audio()) {
117	WarningAlert(GetString(STR_NO_AUDIO_WARN));
118	return false;
119	}
120
121	// Device opened, set AudioStatus
122	set_audio_status_format();
123
124	// Everything went fine
125	audio_open = true;
126	return true;
127	}
128
129	void AudioInit(void)
130	{
131	// Init audio status and feature flags
132	AudioStatus.sample_rate = 44100 << 16;
133	AudioStatus.sample_size = 16;
134	AudioStatus.channels = 2;
135	AudioStatus.mixer = 0;
136	AudioStatus.num_sources = 0;
137	audio_component_flags = cmpWantsRegisterMessage \| kStereoOut \| k16BitOut;
138
139	// Sound disabled in prefs? Then do nothing
140	if (PrefsFindBool("nosound"))
141	return;
142
143	// Init semaphore
144	audio_irq_done_sem = SDL_CreateSemaphore(0);
145
146	// Open and initialize audio device
147	open_audio();
148	}
149
150
151	/*
152	* Deinitialization
153	*/
154
155	static void close_audio(void)
156	{
157	// Close audio device
158	SDL_CloseAudio();
159	audio_open = false;
160	}
161
162	void AudioExit(void)
163	{
164	// Close audio device
165	close_audio();
166
167	// Delete semaphore
168	if (audio_irq_done_sem)
169	SDL_DestroySemaphore(audio_irq_done_sem);
170	}
171
172
173	/*
174	* First source added, start audio stream
175	*/
176
177	void audio_enter_stream()
178	{
179	}
180
181
182	/*
183	* Last source removed, stop audio stream
184	*/
185
186	void audio_exit_stream()
187	{
188	}
189
190
191	/*
192	* Streaming function
193	*/
194
195	static void stream_func(void arg, uint8 stream, int stream_len)
196	{
197	if (AudioStatus.num_sources) {
198
199	// Trigger audio interrupt to get new buffer
200	D(bug("stream: triggering irq\n"));
201	SetInterruptFlag(INTFLAG_AUDIO);
202	TriggerInterrupt();
203	D(bug("stream: waiting for ack\n"));
204	SDL_SemWait(audio_irq_done_sem);
205	D(bug("stream: ack received\n"));
206
207	// Get size of audio data
208	uint32 apple_stream_info = ReadMacInt32(audio_data + adatStreamInfo);
209	if (apple_stream_info) {
210	int work_size = ReadMacInt32(apple_stream_info + scd_sampleCount) * (AudioStatus.sample_size >> 3) * AudioStatus.channels;
211	D(bug("stream: work_size %d\n", work_size));
212	if (work_size > stream_len)
213	work_size = stream_len;
214	if (work_size == 0)
215	goto silence;
216
217	// Send data to audio device
218	Mac2Host_memcpy(stream, ReadMacInt32(apple_stream_info + scd_buffer), work_size);
219	if (work_size != stream_len)
220	memset((uint8 *)stream + work_size, silence_byte, stream_len - work_size);
221	D(bug("stream: data written\n"));
222	} else
223	goto silence;
224
225	} else {
226
227	// Audio not active, play silence
228	silence: memset(stream, silence_byte, stream_len);
229	}
230	#if defined(BINCUE)
231	MixAudio_bincue(stream, stream_len);
232	#endif
233	}
234
235
236	/*
237	* MacOS audio interrupt, read next data block
238	*/
239
240	void AudioInterrupt(void)
241	{
242	D(bug("AudioInterrupt\n"));
243
244	// Get data from apple mixer
245	if (AudioStatus.mixer) {
246	M68kRegisters r;
247	r.a[0] = audio_data + adatStreamInfo;
248	r.a[1] = AudioStatus.mixer;
249	Execute68k(audio_data + adatGetSourceData, &r);
250	D(bug(" GetSourceData() returns %08lx\n", r.d[0]));
251	} else
252	WriteMacInt32(audio_data + adatStreamInfo, 0);
253
254	// Signal stream function
255	SDL_SemPost(audio_irq_done_sem);
256	D(bug("AudioInterrupt done\n"));
257	}
258
259
260	/*
261	* Set sampling parameters
262	* "index" is an index into the audio_sample_rates[] etc. vectors
263	* It is guaranteed that AudioStatus.num_sources == 0
264	*/
265
266	bool audio_set_sample_rate(int index)
267	{
268	close_audio();
269	audio_sample_rate_index = index;
270	return open_audio();
271	}
272
273	bool audio_set_sample_size(int index)
274	{
275	close_audio();
276	audio_sample_size_index = index;
277	return open_audio();
278	}
279
280	bool audio_set_channels(int index)
281	{
282	close_audio();
283	audio_channel_count_index = index;
284	return open_audio();
285	}
286
287
288	/*
289	* Get/set volume controls (volume values received/returned have the left channel
290	* volume in the upper 16 bits and the right channel volume in the lower 16 bits;
291	* both volumes are 8.8 fixed point values with 0x0100 meaning "maximum volume"))
292	*/
293
294	bool audio_get_main_mute(void)
295	{
296	return false;
297	}
298
299	uint32 audio_get_main_volume(void)
300	{
301	return 0x01000100;
302	}
303
304	bool audio_get_speaker_mute(void)
305	{
306	return false;
307	}
308
309	uint32 audio_get_speaker_volume(void)
310	{
311	return 0x01000100;
312	}
313
314	void audio_set_main_mute(bool mute)
315	{
316	}
317
318	void audio_set_main_volume(uint32 vol)
319	{
320	}
321
322	void audio_set_speaker_mute(bool mute)
323	{
324	}
325
326	void audio_set_speaker_volume(uint32 vol)
327	{
328	}