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 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
#	User	Rev	Content
1	gbeauche	1.1	/*
2			* audio_sdl.cpp - Audio support, SDL implementation
3			*
4	gbeauche	1.3	* Basilisk II (C) 1997-2008 Christian Bauer
5	gbeauche	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 "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	asvitkine	1.6	#if defined(BINCUE)
36			#include "bincue_unix.h"
37			#endif
38
39	gbeauche	1.1
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	asvitkine	1.5	audio_spec.samples = 4096;
89	gbeauche	1.1	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	asvitkine	1.6	#if defined(BINCUE)
99			OpenAudio_bincue(audio_spec.freq, audio_spec.format, audio_spec.channels,
100			audio_spec.silence);
101			#endif
102
103	gbeauche	1.1	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	asvitkine	1.6	#if defined(BINCUE)
231			MixAudio_bincue(stream, stream_len);
232			#endif
233	gbeauche	1.1	}
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			}