src/audio/fusionsound/SDL_fsaudio.c - third_party/sdl - Git at Google

 /*
   Simple DirectMedia Layer
   Copyright (C) 1997-2016 Sam Lantinga <slouken@libsdl.org>

   This software is provided 'as-is', without any express or implied
   warranty.  In no event will the authors be held liable for any damages
   arising from the use of this software.

   Permission is granted to anyone to use this software for any purpose,
   including commercial applications, and to alter it and redistribute it
   freely, subject to the following restrictions:

   1. The origin of this software must not be misrepresented; you must not
      claim that you wrote the original software. If you use this software
      in a product, an acknowledgment in the product documentation would be
      appreciated but is not required.
   2. Altered source versions must be plainly marked as such, and must not be
      misrepresented as being the original software.
   3. This notice may not be removed or altered from any source distribution.
 */
 #include "../../SDL_internal.h"

 #if SDL_AUDIO_DRIVER_FUSIONSOUND

 /* !!! FIXME: why is this is SDL_FS_* instead of FUSIONSOUND_*? */

 /* Allow access to a raw mixing buffer */

 #ifdef HAVE_SIGNAL_H
 #include <signal.h>
 #endif
 #include <unistd.h>

 #include "SDL_timer.h"
 #include "SDL_audio.h"
 #include "../SDL_audio_c.h"
 #include "SDL_fsaudio.h"

 #include <fusionsound/fusionsound_version.h>

 /* #define SDL_AUDIO_DRIVER_FUSIONSOUND_DYNAMIC "libfusionsound.so" */

 #ifdef SDL_AUDIO_DRIVER_FUSIONSOUND_DYNAMIC
 #include "SDL_name.h"
 #include "SDL_loadso.h"
 #else
 #define SDL_NAME(X) X
 #endif

 #if (FUSIONSOUND_MAJOR_VERSION == 1) && (FUSIONSOUND_MINOR_VERSION < 1)
 typedef DFBResult DirectResult;
 #endif

 /* Buffers to use - more than 2 gives a lot of latency */
 #define FUSION_BUFFERS              (2)

 #ifdef SDL_AUDIO_DRIVER_FUSIONSOUND_DYNAMIC

 static const char *fs_library = SDL_AUDIO_DRIVER_FUSIONSOUND_DYNAMIC;
 static void *fs_handle = NULL;

 static DirectResult (*SDL_NAME(FusionSoundInit)) (int *argc, char *(*argv[]));
 static DirectResult (*SDL_NAME(FusionSoundCreate)) (IFusionSound **
                                                    ret_interface);

 #define SDL_FS_SYM(x) { #x, (void **) (char *) &SDL_NAME(x) }
 static struct
 {
     const char *name;
     void **func;
 } fs_functions[] = {
 /* *INDENT-OFF* */
     SDL_FS_SYM(FusionSoundInit),
     SDL_FS_SYM(FusionSoundCreate),
 /* *INDENT-ON* */
 };

 #undef SDL_FS_SYM

 static void
 UnloadFusionSoundLibrary()
 {
     if (fs_handle != NULL) {
         SDL_UnloadObject(fs_handle);
         fs_handle = NULL;
     }
 }

 static int
 LoadFusionSoundLibrary(void)
 {
     int i, retval = -1;

     if (fs_handle == NULL) {
         fs_handle = SDL_LoadObject(fs_library);
         if (fs_handle != NULL) {
             retval = 0;
             for (i = 0; i < SDL_arraysize(fs_functions); ++i) {
                 *fs_functions[i].func =
                     SDL_LoadFunction(fs_handle, fs_functions[i].name);
                 if (!*fs_functions[i].func) {
                     retval = -1;
                     UnloadFusionSoundLibrary();
                     break;
                 }
             }
         }
     }

     return retval;
 }

 #else

 static void
 UnloadFusionSoundLibrary()
 {
     return;
 }

 static int
 LoadFusionSoundLibrary(void)
 {
     return 0;
 }

 #endif /* SDL_AUDIO_DRIVER_FUSIONSOUND_DYNAMIC */

 /* This function waits until it is possible to write a full sound buffer */
 static void
 SDL_FS_WaitDevice(_THIS)
 {
     this->hidden->stream->Wait(this->hidden->stream,
                                this->hidden->mixsamples);
 }

 static void
 SDL_FS_PlayDevice(_THIS)
 {
     DirectResult ret;

     ret = this->hidden->stream->Write(this->hidden->stream,
                                       this->hidden->mixbuf,
                                       this->hidden->mixsamples);
     /* If we couldn't write, assume fatal error for now */
     if (ret) {
         SDL_OpenedAudioDeviceDisconnected(this);
     }
 #ifdef DEBUG_AUDIO
     fprintf(stderr, "Wrote %d bytes of audio data\n", this->hidden->mixlen);
 #endif
 }


 static Uint8 *
 SDL_FS_GetDeviceBuf(_THIS)
 {
     return (this->hidden->mixbuf);
 }


 static void
 SDL_FS_CloseDevice(_THIS)
 {
     if (this->hidden->stream) {
         this->hidden->stream->Release(this->hidden->stream);
     }
     if (this->hidden->fs) {
         this->hidden->fs->Release(this->hidden->fs);
     }
     SDL_free(this->hidden->mixbuf);
     SDL_free(this->hidden);
 }


 static int
 SDL_FS_OpenDevice(_THIS, void *handle, const char *devname, int iscapture)
 {
     int bytes;
     SDL_AudioFormat test_format = 0, format = 0;
     FSSampleFormat fs_format;
     FSStreamDescription desc;
     DirectResult ret;

     /* Initialize all variables that we clean on shutdown */
     this->hidden = (struct SDL_PrivateAudioData *)
         SDL_malloc((sizeof *this->hidden));
     if (this->hidden == NULL) {
         return SDL_OutOfMemory();
     }
     SDL_zerop(this->hidden);

     /* Try for a closest match on audio format */
     for (test_format = SDL_FirstAudioFormat(this->spec.format);
          !format && test_format;) {
 #ifdef DEBUG_AUDIO
         fprintf(stderr, "Trying format 0x%4.4x\n", test_format);
 #endif
         switch (test_format) {
         case AUDIO_U8:
             fs_format = FSSF_U8;
             bytes = 1;
             format = 1;
             break;
         case AUDIO_S16SYS:
             fs_format = FSSF_S16;
             bytes = 2;
             format = 1;
             break;
         case AUDIO_S32SYS:
             fs_format = FSSF_S32;
             bytes = 4;
             format = 1;
             break;
         case AUDIO_F32SYS:
             fs_format = FSSF_FLOAT;
             bytes = 4;
             format = 1;
             break;
         default:
             format = 0;
             break;
         }
         if (!format) {
             test_format = SDL_NextAudioFormat();
         }
     }

     if (format == 0) {
         return SDL_SetError("Couldn't find any hardware audio formats");
     }
     this->spec.format = test_format;

     /* Retrieve the main sound interface. */
     ret = SDL_NAME(FusionSoundCreate) (&this->hidden->fs);
     if (ret) {
         return SDL_SetError("Unable to initialize FusionSound: %d", ret);
     }

     this->hidden->mixsamples = this->spec.size / bytes / this->spec.channels;

     /* Fill stream description. */
     desc.flags = FSSDF_SAMPLERATE | FSSDF_BUFFERSIZE |
         FSSDF_CHANNELS | FSSDF_SAMPLEFORMAT | FSSDF_PREBUFFER;
     desc.samplerate = this->spec.freq;
     desc.buffersize = this->spec.size * FUSION_BUFFERS;
     desc.channels = this->spec.channels;
     desc.prebuffer = 10;
     desc.sampleformat = fs_format;

     ret =
         this->hidden->fs->CreateStream(this->hidden->fs, &desc,
                                        &this->hidden->stream);
     if (ret) {
         return SDL_SetError("Unable to create FusionSoundStream: %d", ret);
     }

     /* See what we got */
     desc.flags = FSSDF_SAMPLERATE | FSSDF_BUFFERSIZE |
         FSSDF_CHANNELS | FSSDF_SAMPLEFORMAT;
     ret = this->hidden->stream->GetDescription(this->hidden->stream, &desc);

     this->spec.freq = desc.samplerate;
     this->spec.size =
         desc.buffersize / FUSION_BUFFERS * bytes * desc.channels;
     this->spec.channels = desc.channels;

     /* Calculate the final parameters for this audio specification */
     SDL_CalculateAudioSpec(&this->spec);

     /* Allocate mixing buffer */
     this->hidden->mixlen = this->spec.size;
     this->hidden->mixbuf = (Uint8 *) SDL_malloc(this->hidden->mixlen);
     if (this->hidden->mixbuf == NULL) {
         return SDL_OutOfMemory();
     }
     SDL_memset(this->hidden->mixbuf, this->spec.silence, this->spec.size);

     /* We're ready to rock and roll. :-) */
     return 0;
 }


 static void
 SDL_FS_Deinitialize(void)
 {
     UnloadFusionSoundLibrary();
 }


 static int
 SDL_FS_Init(SDL_AudioDriverImpl * impl)
 {
     if (LoadFusionSoundLibrary() < 0) {
         return 0;
     } else {
         DirectResult ret;

         ret = SDL_NAME(FusionSoundInit) (NULL, NULL);
         if (ret) {
             UnloadFusionSoundLibrary();
             SDL_SetError
                 ("FusionSound: SDL_FS_init failed (FusionSoundInit: %d)",
                  ret);
             return 0;
         }
     }

     /* Set the function pointers */
     impl->OpenDevice = SDL_FS_OpenDevice;
     impl->PlayDevice = SDL_FS_PlayDevice;
     impl->WaitDevice = SDL_FS_WaitDevice;
     impl->GetDeviceBuf = SDL_FS_GetDeviceBuf;
     impl->CloseDevice = SDL_FS_CloseDevice;
     impl->Deinitialize = SDL_FS_Deinitialize;
     impl->OnlyHasDefaultOutputDevice = 1;

     return 1;   /* this audio target is available. */
 }


 AudioBootStrap FUSIONSOUND_bootstrap = {
     "fusionsound", "FusionSound", SDL_FS_Init, 0
 };

 #endif /* SDL_AUDIO_DRIVER_FUSIONSOUND */

 /* vi: set ts=4 sw=4 expandtab: */
	/*
	Simple DirectMedia Layer
	Copyright (C) 1997-2016 Sam Lantinga <slouken@libsdl.org>

	This software is provided 'as-is', without any express or implied
	warranty. In no event will the authors be held liable for any damages
	arising from the use of this software.

	Permission is granted to anyone to use this software for any purpose,
	including commercial applications, and to alter it and redistribute it
	freely, subject to the following restrictions:

	1. The origin of this software must not be misrepresented; you must not
	claim that you wrote the original software. If you use this software
	in a product, an acknowledgment in the product documentation would be
	appreciated but is not required.
	2. Altered source versions must be plainly marked as such, and must not be
	misrepresented as being the original software.
	3. This notice may not be removed or altered from any source distribution.
	*/
	#include "../../SDL_internal.h"

	#if SDL_AUDIO_DRIVER_FUSIONSOUND

	/* !!! FIXME: why is this is SDL_FS_* instead of FUSIONSOUND_? /

	/* Allow access to a raw mixing buffer */

	#ifdef HAVE_SIGNAL_H
	#include <signal.h>
	#endif
	#include <unistd.h>

	#include "SDL_timer.h"
	#include "SDL_audio.h"
	#include "../SDL_audio_c.h"
	#include "SDL_fsaudio.h"

	#include <fusionsound/fusionsound_version.h>

	/* #define SDL_AUDIO_DRIVER_FUSIONSOUND_DYNAMIC "libfusionsound.so" */

	#ifdef SDL_AUDIO_DRIVER_FUSIONSOUND_DYNAMIC
	#include "SDL_name.h"
	#include "SDL_loadso.h"
	#else
	#define SDL_NAME(X) X
	#endif

	#if (FUSIONSOUND_MAJOR_VERSION == 1) && (FUSIONSOUND_MINOR_VERSION < 1)
	typedef DFBResult DirectResult;
	#endif

	/* Buffers to use - more than 2 gives a lot of latency */
	#define FUSION_BUFFERS (2)

	#ifdef SDL_AUDIO_DRIVER_FUSIONSOUND_DYNAMIC

	static const char *fs_library = SDL_AUDIO_DRIVER_FUSIONSOUND_DYNAMIC;
	static void *fs_handle = NULL;

	static DirectResult (SDL_NAME(FusionSoundInit)) (int argc, char (argv[]));
	static DirectResult (SDL_NAME(FusionSoundCreate)) (IFusionSound *
	ret_interface);

	#define SDL_FS_SYM(x) { #x, (void *) (char ) &SDL_NAME(x) }
	static struct
	{
	const char *name;
	void **func;
	} fs_functions[] = {
	/* INDENT-OFF */
	SDL_FS_SYM(FusionSoundInit),
	SDL_FS_SYM(FusionSoundCreate),
	/* INDENT-ON */
	};

	#undef SDL_FS_SYM

	static void
	UnloadFusionSoundLibrary()
	{
	if (fs_handle != NULL) {
	SDL_UnloadObject(fs_handle);
	fs_handle = NULL;
	}
	}

	static int
	LoadFusionSoundLibrary(void)
	{
	int i, retval = -1;

	if (fs_handle == NULL) {
	fs_handle = SDL_LoadObject(fs_library);
	if (fs_handle != NULL) {
	retval = 0;
	for (i = 0; i < SDL_arraysize(fs_functions); ++i) {
	*fs_functions[i].func =
	SDL_LoadFunction(fs_handle, fs_functions[i].name);
	if (!*fs_functions[i].func) {
	retval = -1;
	UnloadFusionSoundLibrary();
	break;
	}
	}
	}
	}

	return retval;
	}

	#else

	static void
	UnloadFusionSoundLibrary()
	{
	return;
	}

	static int
	LoadFusionSoundLibrary(void)
	{
	return 0;
	}

	#endif /* SDL_AUDIO_DRIVER_FUSIONSOUND_DYNAMIC */

	/* This function waits until it is possible to write a full sound buffer */
	static void
	SDL_FS_WaitDevice(_THIS)
	{
	this->hidden->stream->Wait(this->hidden->stream,
	this->hidden->mixsamples);
	}

	static void
	SDL_FS_PlayDevice(_THIS)
	{
	DirectResult ret;

	ret = this->hidden->stream->Write(this->hidden->stream,
	this->hidden->mixbuf,
	this->hidden->mixsamples);
	/* If we couldn't write, assume fatal error for now */
	if (ret) {
	SDL_OpenedAudioDeviceDisconnected(this);
	}
	#ifdef DEBUG_AUDIO
	fprintf(stderr, "Wrote %d bytes of audio data\n", this->hidden->mixlen);
	#endif
	}


	static Uint8 *
	SDL_FS_GetDeviceBuf(_THIS)
	{
	return (this->hidden->mixbuf);
	}


	static void
	SDL_FS_CloseDevice(_THIS)
	{
	if (this->hidden->stream) {
	this->hidden->stream->Release(this->hidden->stream);
	}
	if (this->hidden->fs) {
	this->hidden->fs->Release(this->hidden->fs);
	}
	SDL_free(this->hidden->mixbuf);
	SDL_free(this->hidden);
	}


	static int
	SDL_FS_OpenDevice(_THIS, void handle, const char devname, int iscapture)
	{
	int bytes;
	SDL_AudioFormat test_format = 0, format = 0;
	FSSampleFormat fs_format;
	FSStreamDescription desc;
	DirectResult ret;

	/* Initialize all variables that we clean on shutdown */
	this->hidden = (struct SDL_PrivateAudioData *)
	SDL_malloc((sizeof *this->hidden));
	if (this->hidden == NULL) {
	return SDL_OutOfMemory();
	}
	SDL_zerop(this->hidden);

	/* Try for a closest match on audio format */
	for (test_format = SDL_FirstAudioFormat(this->spec.format);
	!format && test_format;) {
	#ifdef DEBUG_AUDIO
	fprintf(stderr, "Trying format 0x%4.4x\n", test_format);
	#endif
	switch (test_format) {
	case AUDIO_U8:
	fs_format = FSSF_U8;
	bytes = 1;
	format = 1;
	break;
	case AUDIO_S16SYS:
	fs_format = FSSF_S16;
	bytes = 2;
	format = 1;
	break;
	case AUDIO_S32SYS:
	fs_format = FSSF_S32;
	bytes = 4;
	format = 1;
	break;
	case AUDIO_F32SYS:
	fs_format = FSSF_FLOAT;
	bytes = 4;
	format = 1;
	break;
	default:
	format = 0;
	break;
	}
	if (!format) {
	test_format = SDL_NextAudioFormat();
	}
	}

	if (format == 0) {
	return SDL_SetError("Couldn't find any hardware audio formats");
	}
	this->spec.format = test_format;

	/* Retrieve the main sound interface. */
	ret = SDL_NAME(FusionSoundCreate) (&this->hidden->fs);
	if (ret) {
	return SDL_SetError("Unable to initialize FusionSound: %d", ret);
	}

	this->hidden->mixsamples = this->spec.size / bytes / this->spec.channels;

	/* Fill stream description. */
	desc.flags = FSSDF_SAMPLERATE \| FSSDF_BUFFERSIZE \|
	FSSDF_CHANNELS \| FSSDF_SAMPLEFORMAT \| FSSDF_PREBUFFER;
	desc.samplerate = this->spec.freq;
	desc.buffersize = this->spec.size * FUSION_BUFFERS;
	desc.channels = this->spec.channels;
	desc.prebuffer = 10;
	desc.sampleformat = fs_format;

	ret =
	this->hidden->fs->CreateStream(this->hidden->fs, &desc,
	&this->hidden->stream);
	if (ret) {
	return SDL_SetError("Unable to create FusionSoundStream: %d", ret);
	}

	/* See what we got */
	desc.flags = FSSDF_SAMPLERATE \| FSSDF_BUFFERSIZE \|
	FSSDF_CHANNELS \| FSSDF_SAMPLEFORMAT;
	ret = this->hidden->stream->GetDescription(this->hidden->stream, &desc);

	this->spec.freq = desc.samplerate;
	this->spec.size =
	desc.buffersize / FUSION_BUFFERS * bytes * desc.channels;
	this->spec.channels = desc.channels;

	/* Calculate the final parameters for this audio specification */
	SDL_CalculateAudioSpec(&this->spec);

	/* Allocate mixing buffer */
	this->hidden->mixlen = this->spec.size;
	this->hidden->mixbuf = (Uint8 *) SDL_malloc(this->hidden->mixlen);
	if (this->hidden->mixbuf == NULL) {
	return SDL_OutOfMemory();
	}
	SDL_memset(this->hidden->mixbuf, this->spec.silence, this->spec.size);

	/* We're ready to rock and roll. :-) */
	return 0;
	}


	static void
	SDL_FS_Deinitialize(void)
	{
	UnloadFusionSoundLibrary();
	}


	static int
	SDL_FS_Init(SDL_AudioDriverImpl * impl)
	{
	if (LoadFusionSoundLibrary() < 0) {
	return 0;
	} else {
	DirectResult ret;

	ret = SDL_NAME(FusionSoundInit) (NULL, NULL);
	if (ret) {
	UnloadFusionSoundLibrary();
	SDL_SetError
	("FusionSound: SDL_FS_init failed (FusionSoundInit: %d)",
	ret);
	return 0;
	}
	}

	/* Set the function pointers */
	impl->OpenDevice = SDL_FS_OpenDevice;
	impl->PlayDevice = SDL_FS_PlayDevice;
	impl->WaitDevice = SDL_FS_WaitDevice;
	impl->GetDeviceBuf = SDL_FS_GetDeviceBuf;
	impl->CloseDevice = SDL_FS_CloseDevice;
	impl->Deinitialize = SDL_FS_Deinitialize;
	impl->OnlyHasDefaultOutputDevice = 1;

	return 1; /* this audio target is available. */
	}


	AudioBootStrap FUSIONSOUND_bootstrap = {
	"fusionsound", "FusionSound", SDL_FS_Init, 0
	};

	#endif /* SDL_AUDIO_DRIVER_FUSIONSOUND */

	/* vi: set ts=4 sw=4 expandtab: */