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C++ SDL_FirstAudioFormat函数代码示例

本文整理汇总了C++中SDL_FirstAudioFormat函数的典型用法代码示例。如果您正苦于以下问题：C++ SDL_FirstAudioFormat函数的具体用法？C++ SDL_FirstAudioFormat怎么用？C++ SDL_FirstAudioFormat使用的例子？那么, 这里精选的函数代码示例或许可以为您提供帮助。


在下文中一共展示了SDL_FirstAudioFormat函数的15个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。

示例1: AndroidAUD_OpenDevice

static int
AndroidAUD_OpenDevice(_THIS, const char *devname, int iscapture)
{
    SDL_AudioFormat test_format = SDL_FirstAudioFormat(this->spec.format);
    int valid_datatype = 0;
    
    //TODO: Sample rates etc
    __android_log_print(ANDROID_LOG_INFO, "SDL", "AndroidAudio Open\n");

    this->hidden = SDL_malloc(sizeof(*(this->hidden)));
    if (!this->hidden) {
        SDL_OutOfMemory();
        return 0;
    }
    SDL_memset(this->hidden, 0, (sizeof *this->hidden));

    while ((!valid_datatype) && (test_format)) {
        this->spec.format = test_format;
        switch (test_format) {
        case AUDIO_S8:
            /*case AUDIO_S16LSB: */
            valid_datatype = 1;
            break;
        default:
            test_format = SDL_NextAudioFormat();
            break;
        }
    }
    
    return 1;
}
开发者ID:OoNEKERAFAoO，项目名称:SDL_PSL1GHT，代码行数:31，代码来源:SDL_androidaudio.c

示例2: AndroidAUD_OpenDevice

static int
AndroidAUD_OpenDevice(_THIS, void *handle, const char *devname, int iscapture)
{
    SDL_AudioFormat test_format;

    if (iscapture) {
        /* TODO: implement capture */
        return SDL_SetError("Capture not supported on Android");
    }

    if (audioDevice != NULL) {
        return SDL_SetError("Only one audio device at a time please!");
    }

    audioDevice = this;
    
    this->hidden = (struct SDL_PrivateAudioData *) SDL_calloc(1, (sizeof *this->hidden));
    if (this->hidden == NULL) {
        return SDL_OutOfMemory();
    }

    test_format = SDL_FirstAudioFormat(this->spec.format);
    while (test_format != 0) { /* no "UNKNOWN" constant */
        if ((test_format == AUDIO_U8) || (test_format == AUDIO_S16LSB)) {
            this->spec.format = test_format;
            break;
        }
        test_format = SDL_NextAudioFormat();
    }

    if (test_format == 0) {
        /* Didn't find a compatible format :( */
        return SDL_SetError("No compatible audio format!");
    }

    if (this->spec.channels > 1) {
        this->spec.channels = 2;
    } else {
        this->spec.channels = 1;
    }

    if (this->spec.freq < 8000) {
        this->spec.freq = 8000;
    }
    if (this->spec.freq > 48000) {
        this->spec.freq = 48000;
    }

    /* TODO: pass in/return a (Java) device ID, also whether we're opening for input or output */
    this->spec.samples = Android_JNI_OpenAudioDevice(this->spec.freq, this->spec.format == AUDIO_U8 ? 0 : 1, this->spec.channels, this->spec.samples);
    SDL_CalculateAudioSpec(&this->spec);

    if (this->spec.samples == 0) {
        /* Init failed? */
        return SDL_SetError("Java-side initialization failed!");
    }

    return 0;
}
开发者ID:suxinde2009，项目名称:SDL，代码行数:59，代码来源:SDL_androidaudio.c

示例3: ANDROIDAUDIO_OpenDevice

static int
ANDROIDAUDIO_OpenDevice(_THIS, void *handle, const char *devname, int iscapture)
{
    SDL_AudioFormat test_format;

    SDL_assert((captureDevice == NULL) || !iscapture);
    SDL_assert((audioDevice == NULL) || iscapture);

    if (iscapture) {
        captureDevice = this;
    } else {
        audioDevice = this;
    }

    this->hidden = (struct SDL_PrivateAudioData *) SDL_calloc(1, (sizeof *this->hidden));
    if (this->hidden == NULL) {
        return SDL_OutOfMemory();
    }

    test_format = SDL_FirstAudioFormat(this->spec.format);
    while (test_format != 0) { /* no "UNKNOWN" constant */
        if ((test_format == AUDIO_U8) || (test_format == AUDIO_S16LSB)) {
            this->spec.format = test_format;
            break;
        }
        test_format = SDL_NextAudioFormat();
    }

    if (test_format == 0) {
        /* Didn't find a compatible format :( */
        return SDL_SetError("No compatible audio format!");
    }

    if (this->spec.channels > 1) {
        this->spec.channels = 2;
    } else {
        this->spec.channels = 1;
    }

    if (this->spec.freq < 8000) {
        this->spec.freq = 8000;
    }
    if (this->spec.freq > 48000) {
        this->spec.freq = 48000;
    }

    /* TODO: pass in/return a (Java) device ID */
    this->spec.samples = Android_JNI_OpenAudioDevice(iscapture, this->spec.freq, this->spec.format == AUDIO_U8 ? 0 : 1, this->spec.channels, this->spec.samples);

    if (this->spec.samples == 0) {
        /* Init failed? */
        return SDL_SetError("Java-side initialization failed!");
    }

    SDL_CalculateAudioSpec(&this->spec);

    return 0;
}
开发者ID:1vanK，项目名称:Urho3D，代码行数:58，代码来源:SDL_androidaudio.c

示例4: DSOUND_OpenDevice

static int
DSOUND_OpenDevice(_THIS, void *handle, const char *devname, int iscapture)
{
    HRESULT result;
    SDL_bool valid_format = SDL_FALSE;
    SDL_bool tried_format = SDL_FALSE;
    SDL_AudioFormat test_format = SDL_FirstAudioFormat(this->spec.format);
    LPGUID guid = (LPGUID) handle;

    /* 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_memset(this->hidden, 0, (sizeof *this->hidden));

    /* Open the audio device */
    result = pDirectSoundCreate8(guid, &this->hidden->sound, NULL);
    if (result != DS_OK) {
        DSOUND_CloseDevice(this);
        return SetDSerror("DirectSoundCreate", result);
    }

    while ((!valid_format) && (test_format)) {
        switch (test_format) {
        case AUDIO_U8:
        case AUDIO_S16:
        case AUDIO_S32:
        case AUDIO_F32:
            tried_format = SDL_TRUE;
            this->spec.format = test_format;
            this->hidden->num_buffers = CreateSecondary(this, NULL);
            if (this->hidden->num_buffers > 0) {
                valid_format = SDL_TRUE;
            }
            break;
        }
        test_format = SDL_NextAudioFormat();
    }

    if (!valid_format) {
        DSOUND_CloseDevice(this);
        if (tried_format) {
            return -1;  /* CreateSecondary() should have called SDL_SetError(). */
        }
        return SDL_SetError("DirectSound: Unsupported audio format");
    }

    /* The buffer will auto-start playing in DSOUND_WaitDevice() */
    this->hidden->mixlen = this->spec.size;

    return 0;                   /* good to go. */
}
开发者ID:Derek-OBrien，项目名称:DsdlEngine，代码行数:54，代码来源:SDL_directsound.c

示例5: ANDROIDAUDIO_OpenDevice

static int
ANDROIDAUDIO_OpenDevice(_THIS, void *handle, const char *devname, int iscapture)
{
    SDL_AudioFormat test_format;

    SDL_assert((captureDevice == NULL) || !iscapture);
    SDL_assert((audioDevice == NULL) || iscapture);

    if (iscapture) {
        captureDevice = this;
    } else {
        audioDevice = this;
    }

    this->hidden = (struct SDL_PrivateAudioData *) SDL_calloc(1, (sizeof *this->hidden));
    if (this->hidden == NULL) {
        return SDL_OutOfMemory();
    }

    test_format = SDL_FirstAudioFormat(this->spec.format);
    while (test_format != 0) { /* no "UNKNOWN" constant */
        if ((test_format == AUDIO_U8) ||
			(test_format == AUDIO_S16) ||
			(test_format == AUDIO_F32)) {
            this->spec.format = test_format;
            break;
        }
        test_format = SDL_NextAudioFormat();
    }

    if (test_format == 0) {
        /* Didn't find a compatible format :( */
        return SDL_SetError("No compatible audio format!");
    }

    if (Android_JNI_OpenAudioDevice(iscapture, &this->spec) < 0) {
        return -1;
    }

    SDL_CalculateAudioSpec(&this->spec);

    return 0;
}
开发者ID:GWRon，项目名称:sdl.mod，代码行数:43，代码来源:SDL_androidaudio.c

示例6: NDSAUD_OpenDevice

static int
NDSAUD_OpenDevice(_THIS, const char *devname, int iscapture)
{
    SDL_AudioFormat test_format = SDL_FirstAudioFormat(this->spec.format);
    int valid_datatype = 0;

    this->hidden = SDL_malloc(sizeof(*(this->hidden)));
    if (!this->hidden) {
        SDL_OutOfMemory();
        return 0;
    }
    SDL_memset(this->hidden, 0, (sizeof *this->hidden));

    while ((!valid_datatype) && (test_format)) {
        this->spec.format = test_format;
        switch (test_format) {
        case AUDIO_S8:
            /*case AUDIO_S16LSB: */
            valid_datatype = 1;
            break;
        default:
            test_format = SDL_NextAudioFormat();
            break;
        }
    }

#if 0
    /* set the generic sound parameters */
    setGenericSound(22050,      /* sample rate */
                    127,        /* volume */
                    64,         /* panning/balance */
                    0);         /* sound format */
#endif

    return 1;
}
开发者ID:AG-Dev，项目名称:wesnoth_ios，代码行数:36，代码来源:SDL_ndsaudio.c

示例7: PULSEAUDIO_OpenDevice

static int
PULSEAUDIO_OpenDevice(_THIS, const char *devname, int iscapture)
{
    struct SDL_PrivateAudioData *h = NULL;
    Uint16 test_format = 0;
    pa_sample_spec paspec;
    pa_buffer_attr paattr;
    pa_channel_map pacmap;
    pa_stream_flags_t flags = 0;
    int state = 0;

    /* 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_memset(this->hidden, 0, (sizeof *this->hidden));
    h = this->hidden;

    paspec.format = PA_SAMPLE_INVALID;

    /* Try for a closest match on audio format */
    for (test_format = SDL_FirstAudioFormat(this->spec.format);
         (paspec.format == PA_SAMPLE_INVALID) && test_format;) {
#ifdef DEBUG_AUDIO
        fprintf(stderr, "Trying format 0x%4.4x\n", test_format);
#endif
        switch (test_format) {
        case AUDIO_U8:
            paspec.format = PA_SAMPLE_U8;
            break;
        case AUDIO_S16LSB:
            paspec.format = PA_SAMPLE_S16LE;
            break;
        case AUDIO_S16MSB:
            paspec.format = PA_SAMPLE_S16BE;
            break;
        case AUDIO_S32LSB:
            paspec.format = PA_SAMPLE_S32LE;
            break;
        case AUDIO_S32MSB:
            paspec.format = PA_SAMPLE_S32BE;
            break;
        case AUDIO_F32LSB:
            paspec.format = PA_SAMPLE_FLOAT32LE;
            break;
        case AUDIO_F32MSB:
            paspec.format = PA_SAMPLE_FLOAT32BE;
            break;
        default:
            paspec.format = PA_SAMPLE_INVALID;
            break;
        }
        if (paspec.format == PA_SAMPLE_INVALID) {
            test_format = SDL_NextAudioFormat();
        }
    }
    if (paspec.format == PA_SAMPLE_INVALID) {
        PULSEAUDIO_CloseDevice(this);
        return SDL_SetError("Couldn't find any hardware audio formats");
    }
    this->spec.format = test_format;

    /* Calculate the final parameters for this audio specification */
#ifdef PA_STREAM_ADJUST_LATENCY
    this->spec.samples /= 2; /* Mix in smaller chunck to avoid underruns */
#endif
    SDL_CalculateAudioSpec(&this->spec);

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

    paspec.channels = this->spec.channels;
    paspec.rate = this->spec.freq;

    /* Reduced prebuffering compared to the defaults. */
#ifdef PA_STREAM_ADJUST_LATENCY
    /* 2x original requested bufsize */
    paattr.tlength = h->mixlen * 4;
    paattr.prebuf = -1;
    paattr.maxlength = -1;
    /* -1 can lead to pa_stream_writable_size() >= mixlen never being true */
    paattr.minreq = h->mixlen;
    flags = PA_STREAM_ADJUST_LATENCY;
#else
    paattr.tlength = h->mixlen*2;
    paattr.prebuf = h->mixlen*2;
    paattr.maxlength = h->mixlen*2;
    paattr.minreq = h->mixlen;
#endif

    /* The SDL ALSA output hints us that we use Windows' channel mapping */
    /* http://bugzilla.libsdl.org/show_bug.cgi?id=110 */
//.........这里部分代码省略.........
开发者ID:skylersaleh，项目名称:ArgonEngine，代码行数:101，代码来源:SDL_pulseaudio.c

示例8: DSP_OpenAudio

static int DSP_OpenAudio(_THIS, SDL_AudioSpec *spec)
{
	char audiodev[1024];
	int format;
	int value;
	Uint16 test_format;

	/* Reset the timer synchronization flag */
	frame_ticks = 0.0;

	/* Open the audio device */
	audio_fd = SDL_OpenAudioPath(audiodev, sizeof(audiodev), OPEN_FLAGS, 0);
	if ( audio_fd < 0 ) {
		SDL_SetError("Couldn't open %s: %s", audiodev, strerror(errno));
		return(-1);
	}
	mixbuf = NULL;

#ifdef USE_BLOCKING_WRITES
	/* Make the file descriptor use blocking writes with fcntl() */
	{ long flags;
		flags = fcntl(audio_fd, F_GETFL);
		flags &= ~O_NONBLOCK;
		if ( fcntl(audio_fd, F_SETFL, flags) < 0 ) {
			SDL_SetError("Couldn't set audio blocking mode");
			return(-1);
		}
	}
#endif

	/* Get a list of supported hardware formats */
	if ( ioctl(audio_fd, SNDCTL_DSP_GETFMTS, &value) < 0 ) {
		SDL_SetError("Couldn't get audio format list");
		return(-1);
	}

	/* Try for a closest match on audio format */
	format = 0;
	for ( test_format = SDL_FirstAudioFormat(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:
				if ( value & AFMT_U8 ) {
					format = AFMT_U8;
				}
				break;
			case AUDIO_S8:
				if ( value & AFMT_S8 ) {
					format = AFMT_S8;
				}
				break;
			case AUDIO_S16LSB:
				if ( value & AFMT_S16_LE ) {
					format = AFMT_S16_LE;
				}
				break;
			case AUDIO_S16MSB:
				if ( value & AFMT_S16_BE ) {
					format = AFMT_S16_BE;
				}
				break;
			case AUDIO_U16LSB:
				if ( value & AFMT_U16_LE ) {
					format = AFMT_U16_LE;
				}
				break;
			case AUDIO_U16MSB:
				if ( value & AFMT_U16_BE ) {
					format = AFMT_U16_BE;
				}
				break;
			default:
				format = 0;
				break;
		}
		if ( ! format ) {
			test_format = SDL_NextAudioFormat();
		}
	}
	if ( format == 0 ) {
		SDL_SetError("Couldn't find any hardware audio formats");
		return(-1);
	}
	spec->format = test_format;

	/* Set the audio format */
	value = format;
	if ( (ioctl(audio_fd, SNDCTL_DSP_SETFMT, &value) < 0) ||
						(value != format) ) {
		SDL_SetError("Couldn't set audio format");
		return(-1);
	}

	/* Set the number of channels of output */
	value = spec->channels;
#ifdef SNDCTL_DSP_CHANNELS
	if ( ioctl(audio_fd, SNDCTL_DSP_CHANNELS, &value) < 0 ) {
//.........这里部分代码省略.........
开发者ID:acassis，项目名称:emlinux-ssd1935，代码行数:101，代码来源:SDL_dspaudio.c

示例9: NAS_OpenAudio

static int NAS_OpenAudio(_THIS, SDL_AudioSpec *spec)
{
	AuElement elms[3];
	int buffer_size;
	Uint16 test_format, format;

	this->hidden->mixbuf = NULL;

	/* Try for a closest match on audio format */
	format = 0;
	for ( test_format = SDL_FirstAudioFormat(spec->format);
						! format && test_format; ) {
		format = sdlformat_to_auformat(test_format);

		if (format == AuNone) {
			test_format = SDL_NextAudioFormat();
		}
	}
	if ( format == 0 ) {
		SDL_SetError("Couldn't find any hardware audio formats");
		return(-1);
	}
	spec->format = test_format;

	this->hidden->aud = AuOpenServer("", 0, NULL, 0, NULL, NULL);
	if (this->hidden->aud == 0)
	{
		SDL_SetError("Couldn't open connection to NAS server");
		return (-1);
	}
	
	this->hidden->dev = find_device(this, spec->channels);
	if ((this->hidden->dev == AuNone) || (!(this->hidden->flow = AuCreateFlow(this->hidden->aud, NULL)))) {
		AuCloseServer(this->hidden->aud);
		this->hidden->aud = 0;
		SDL_SetError("Couldn't find a fitting playback device on NAS server");
		return (-1);
	}
	
	buffer_size = spec->freq;
	if (buffer_size < 4096)
		buffer_size = 4096; 

	if (buffer_size > 32768)
		buffer_size = 32768; /* So that the buffer won't get unmanageably big. */

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

	this2 = this->hidden;

	AuMakeElementImportClient(elms, spec->freq, format, spec->channels, AuTrue,
				buffer_size, buffer_size / 4, 0, NULL);
	AuMakeElementExportDevice(elms+1, 0, this->hidden->dev, spec->freq,
				AuUnlimitedSamples, 0, NULL);
	AuSetElements(this->hidden->aud, this->hidden->flow, AuTrue, 2, elms, NULL);
	AuRegisterEventHandler(this->hidden->aud, AuEventHandlerIDMask, 0, this->hidden->flow,
				event_handler, (AuPointer) NULL);

	AuStartFlow(this->hidden->aud, this->hidden->flow, NULL);

	/* Allocate mixing buffer */
	this->hidden->mixlen = spec->size;
	this->hidden->mixbuf = (Uint8 *)SDL_AllocAudioMem(this->hidden->mixlen);
	if ( this->hidden->mixbuf == NULL ) {
		return(-1);
	}
	memset(this->hidden->mixbuf, spec->silence, spec->size);

	/* Get the parent process id (we're the parent of the audio thread) */
	this->hidden->parent = getpid();

	/* We're ready to rock and roll. :-) */
	return(0);
}
开发者ID:bohwaz，项目名称:ozex，代码行数:75，代码来源:SDL_nasaudio.c

示例10: BSDAUDIO_OpenDevice

static int
BSDAUDIO_OpenDevice(_THIS, const char *devname, int iscapture)
{
    const int flags = ((iscapture) ? OPEN_FLAGS_INPUT : OPEN_FLAGS_OUTPUT);
    SDL_AudioFormat format = 0;
    audio_info_t info;

    /* We don't care what the devname is...we'll try to open anything. */
    /*  ...but default to first name in the list... */
    if (devname == NULL) {
        devname = SDL_GetAudioDeviceName(0, iscapture);
        if (devname == NULL) {
            SDL_SetError("No such audio device");
            return 0;
        }
    }

    /* Initialize all variables that we clean on shutdown */
    this->hidden = (struct SDL_PrivateAudioData *)
        SDL_malloc((sizeof *this->hidden));
    if (this->hidden == NULL) {
        SDL_OutOfMemory();
        return 0;
    }
    SDL_memset(this->hidden, 0, (sizeof *this->hidden));

    /* Open the audio device */
    this->hidden->audio_fd = open(devname, flags, 0);
    if (this->hidden->audio_fd < 0) {
        SDL_SetError("Couldn't open %s: %s", devname, strerror(errno));
        return 0;
    }

    AUDIO_INITINFO(&info);

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

    /* Set to play mode */
    info.mode = AUMODE_PLAY;
    if (ioctl(this->hidden->audio_fd, AUDIO_SETINFO, &info) < 0) {
        BSDAUDIO_CloseDevice(this);
        SDL_SetError("Couldn't put device into play mode");
        return 0;
    }

    AUDIO_INITINFO(&info);
    for (format = SDL_FirstAudioFormat(this->spec.format);
         format; format = SDL_NextAudioFormat()) {
        switch (format) {
        case AUDIO_U8:
            info.play.encoding = AUDIO_ENCODING_ULINEAR;
            info.play.precision = 8;
            break;
        case AUDIO_S8:
            info.play.encoding = AUDIO_ENCODING_SLINEAR;
            info.play.precision = 8;
            break;
        case AUDIO_S16LSB:
            info.play.encoding = AUDIO_ENCODING_SLINEAR_LE;
            info.play.precision = 16;
            break;
        case AUDIO_S16MSB:
            info.play.encoding = AUDIO_ENCODING_SLINEAR_BE;
            info.play.precision = 16;
            break;
        case AUDIO_U16LSB:
            info.play.encoding = AUDIO_ENCODING_ULINEAR_LE;
            info.play.precision = 16;
            break;
        case AUDIO_U16MSB:
            info.play.encoding = AUDIO_ENCODING_ULINEAR_BE;
            info.play.precision = 16;
            break;
        default:
            continue;
        }

        if (ioctl(this->hidden->audio_fd, AUDIO_SETINFO, &info) == 0) {
            break;
        }
    }

    if (!format) {
        BSDAUDIO_CloseDevice(this);
        SDL_SetError("No supported encoding for 0x%x", this->spec.format);
        return 0;
    }

    this->spec.format = format;

    AUDIO_INITINFO(&info);
    info.play.channels = this->spec.channels;
    if (ioctl(this->hidden->audio_fd, AUDIO_SETINFO, &info) == -1) {
        this->spec.channels = 1;
    }
    AUDIO_INITINFO(&info);
    info.play.sample_rate = this->spec.freq;
    info.blocksize = this->spec.size;
    info.hiwat = 5;
//.........这里部分代码省略.........
开发者ID:Arvoreen，项目名称:Lincity4droid，代码行数:101，代码来源:SDL_bsdaudio.c

示例11: WINMM_OpenDevice

static int
WINMM_OpenDevice(_THIS, void *handle, const char *devname, int iscapture)
{
    SDL_AudioFormat test_format = SDL_FirstAudioFormat(this->spec.format);
    int valid_datatype = 0;
    MMRESULT result;
    WAVEFORMATEX waveformat;
    UINT devId = WAVE_MAPPER;  /* WAVE_MAPPER == choose system's default */
    UINT i;

    if (handle != NULL) {  /* specific device requested? */
        /* -1 because we increment the original value to avoid NULL. */
        const size_t val = ((size_t) handle) - 1;
        devId = (UINT) val;
    }

    /* 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_memset(this->hidden, 0, (sizeof *this->hidden));

    /* Initialize the wavebuf structures for closing */
    for (i = 0; i < NUM_BUFFERS; ++i)
        this->hidden->wavebuf[i].dwUser = 0xFFFF;

    if (this->spec.channels > 2)
        this->spec.channels = 2;        /* !!! FIXME: is this right? */

    while ((!valid_datatype) && (test_format)) {
        switch (test_format) {
        case AUDIO_U8:
        case AUDIO_S16:
        case AUDIO_S32:
        case AUDIO_F32:
            this->spec.format = test_format;
            if (PrepWaveFormat(this, devId, &waveformat, iscapture)) {
                valid_datatype = 1;
            } else {
                test_format = SDL_NextAudioFormat();
            }
            break;

        default:
            test_format = SDL_NextAudioFormat();
            break;
        }
    }

    if (!valid_datatype) {
        WINMM_CloseDevice(this);
        return SDL_SetError("Unsupported audio format");
    }

    /* Update the fragment size as size in bytes */
    SDL_CalculateAudioSpec(&this->spec);

    /* Open the audio device */
    if (iscapture) {
        result = waveInOpen(&this->hidden->hin, devId, &waveformat,
                             (DWORD_PTR) CaptureSound, (DWORD_PTR) this,
                             CALLBACK_FUNCTION);
    } else {
        result = waveOutOpen(&this->hidden->hout, devId, &waveformat,
                             (DWORD_PTR) FillSound, (DWORD_PTR) this,
                             CALLBACK_FUNCTION);
    }

    if (result != MMSYSERR_NOERROR) {
        WINMM_CloseDevice(this);
        return SetMMerror("waveOutOpen()", result);
    }
#ifdef SOUND_DEBUG
    /* Check the sound device we retrieved */
    {
        WAVEOUTCAPS caps;

        result = waveOutGetDevCaps((UINT) this->hidden->hout,
                                   &caps, sizeof(caps));
        if (result != MMSYSERR_NOERROR) {
            WINMM_CloseDevice(this);
            return SetMMerror("waveOutGetDevCaps()", result);
        }
        printf("Audio device: %s\n", caps.szPname);
    }
#endif

    /* Create the audio buffer semaphore */
    this->hidden->audio_sem =
        CreateSemaphore(NULL, NUM_BUFFERS - 1, NUM_BUFFERS, NULL);
    if (this->hidden->audio_sem == NULL) {
        WINMM_CloseDevice(this);
        return SDL_SetError("Couldn't create semaphore");
    }

    /* Create the sound buffers */
    this->hidden->mixbuf =
        (Uint8 *) SDL_malloc(NUM_BUFFERS * this->spec.size);
//.........这里部分代码省略.........
开发者ID:03050903，项目名称:Torque3D，代码行数:101，代码来源:SDL_winmm.c

示例12: COREAUDIO_OpenDevice

static int
COREAUDIO_OpenDevice(_THIS, const char *devname, int iscapture)
{

    fprintf(stderr, "OpenDevice\n");
    AudioStreamBasicDescription strdesc;
    SDL_AudioFormat test_format = SDL_FirstAudioFormat(this->spec.format);
    int valid_datatype = 0;

    /* Initialize all variables that we clean on shutdown */
    this->hidden = (struct SDL_PrivateAudioData *)
        SDL_malloc((sizeof *this->hidden));
    if (this->hidden == NULL) {
        SDL_OutOfMemory();
        fprintf(stderr, "OutOfMemory\n");
        return (0);
    }
    SDL_memset(this->hidden, 0, (sizeof *this->hidden));

    /* Setup a AudioStreamBasicDescription with the requested format */
    SDL_memset(&strdesc, '\0', sizeof(AudioStreamBasicDescription));
    strdesc.mFormatID = kAudioFormatLinearPCM;
    strdesc.mFormatFlags = kLinearPCMFormatFlagIsPacked;
    strdesc.mChannelsPerFrame = this->spec.channels;
    strdesc.mSampleRate = this->spec.freq;
    strdesc.mFramesPerPacket = 1;

    while ((!valid_datatype) && (test_format)) {
        this->spec.format = test_format;
        /* Just a list of valid SDL formats, so people don't pass junk here. */
        switch (test_format) {
        case AUDIO_U8:
        case AUDIO_S8:
        case AUDIO_U16LSB:
        case AUDIO_S16LSB:
        case AUDIO_U16MSB:
        case AUDIO_S16MSB:
        case AUDIO_S32LSB:
        case AUDIO_S32MSB:
        case AUDIO_F32LSB:
        case AUDIO_F32MSB:
            valid_datatype = 1;
            strdesc.mBitsPerChannel = SDL_AUDIO_BITSIZE(this->spec.format);
            if (SDL_AUDIO_ISBIGENDIAN(this->spec.format))
                strdesc.mFormatFlags |= kLinearPCMFormatFlagIsBigEndian;

            if (SDL_AUDIO_ISFLOAT(this->spec.format))
                strdesc.mFormatFlags |= kLinearPCMFormatFlagIsFloat;
            else if (SDL_AUDIO_ISSIGNED(this->spec.format))
                strdesc.mFormatFlags |= kLinearPCMFormatFlagIsSignedInteger;
            break;
        }
    }

    if (!valid_datatype) {      /* shouldn't happen, but just in case... */
        COREAUDIO_CloseDevice(this);
        fprintf(stderr, "Unsupported audio format\n");
        return 0;
    }

    strdesc.mBytesPerFrame =
        strdesc.mBitsPerChannel * strdesc.mChannelsPerFrame / 8;
    strdesc.mBytesPerPacket =
        strdesc.mBytesPerFrame * strdesc.mFramesPerPacket;

    if (!prepare_audiounit(this, devname, iscapture, &strdesc)) {
        COREAUDIO_CloseDevice(this);
        fprintf(stderr, "prepare_audiounit failed\n");
        return 0;               /* prepare_audiounit() will call SDL_SetError()... */
    }

    return 1;                   /* good to go. */
}
开发者ID:arcanon，项目名称:ipadflash，代码行数:73，代码来源:SDL_coreaudio_iphone.c

示例13: QSA_OpenDevice


//.........这里部分代码省略.........
                             this->hidden->cardno, this->hidden->deviceno,
                             SND_PCM_OPEN_PLAYBACK);
        } else {
            status =
                snd_pcm_open(&this->hidden->audio_handle,
                             this->hidden->cardno, this->hidden->deviceno,
                             SND_PCM_OPEN_CAPTURE);
        }
    }

    /* Check if requested device is opened */
    if (status < 0) {
        this->hidden->audio_handle = NULL;
        QSA_CloseDevice(this);
        return QSA_SetError("snd_pcm_open", status);
    }

    if (!QSA_CheckBuggyCards(this, QSA_MMAP_WORKAROUND)) {
        /* Disable QSA MMAP plugin for buggy audio drivers */
        status =
            snd_pcm_plugin_set_disable(this->hidden->audio_handle,
                                       PLUGIN_DISABLE_MMAP);
        if (status < 0) {
            QSA_CloseDevice(this);
            return QSA_SetError("snd_pcm_plugin_set_disable", status);
        }
    }

    /* Try for a closest match on audio format */
    format = 0;
    /* can't use format as SND_PCM_SFMT_U8 = 0 in qsa */
    found = 0;

    for (test_format = SDL_FirstAudioFormat(this->spec.format); !found;) {
        /* if match found set format to equivalent QSA format */
        switch (test_format) {
        case AUDIO_U8:
            {
                format = SND_PCM_SFMT_U8;
                found = 1;
            }
            break;
        case AUDIO_S8:
            {
                format = SND_PCM_SFMT_S8;
                found = 1;
            }
            break;
        case AUDIO_S16LSB:
            {
                format = SND_PCM_SFMT_S16_LE;
                found = 1;
            }
            break;
        case AUDIO_S16MSB:
            {
                format = SND_PCM_SFMT_S16_BE;
                found = 1;
            }
            break;
        case AUDIO_U16LSB:
            {
                format = SND_PCM_SFMT_U16_LE;
                found = 1;
            }
            break;
开发者ID:KSLcom，项目名称:caesaria-game，代码行数:67，代码来源:SDL_qsa_audio.c

示例14: DART_OpenAudio

int DART_OpenAudio(_THIS, SDL_AudioSpec *spec)
{
  Uint16 test_format = SDL_FirstAudioFormat(spec->format);
  int valid_datatype = 0;
  MCI_AMP_OPEN_PARMS AmpOpenParms;
  MCI_GENERIC_PARMS GenericParms;
  int iDeviceOrd = 0; 
  int bOpenShared = 1; 
  int iBits = 16; 
  int iFreq = 44100; 
  int iChannels = 2; 
  int iNumBufs = 2;  
  int iBufSize;
  int iOpenMode;
  int iSilence;
  int rc;

  
  SDL_memset(&AmpOpenParms, 0, sizeof(MCI_AMP_OPEN_PARMS));
  
  AmpOpenParms.pszDeviceType = (PSZ) (MCI_DEVTYPE_AUDIO_AMPMIX | (iDeviceOrd << 16));

  iOpenMode = MCI_WAIT | MCI_OPEN_TYPE_ID;
  if (bOpenShared) iOpenMode |= MCI_OPEN_SHAREABLE;

  rc = mciSendCommand( 0, MCI_OPEN,
                       iOpenMode,
		       (PVOID) &AmpOpenParms, 0);
  if (rc!=MCIERR_SUCCESS) 
    return (-1);
  
  
  iDeviceOrd = AmpOpenParms.usDeviceID;

  
  if (spec->channels > 2)
    spec->channels = 2;  

  while ((!valid_datatype) && (test_format)) {
    spec->format = test_format;
    valid_datatype = 1;
    switch (test_format) {
      case AUDIO_U8:
        
        iSilence = 0x80;
        iBits = 8;
        break;

      case AUDIO_S16LSB:
        
        iSilence = 0x00;
        iBits = 16;
        break;

      default:
        valid_datatype = 0;
        test_format = SDL_NextAudioFormat();
        break;
    }
  }

  if (!valid_datatype) { 
    
    mciSendCommand(iDeviceOrd, MCI_CLOSE, MCI_WAIT, &GenericParms, 0);
    SDL_SetError("Unsupported audio format");
    return (-1);
  }

  iFreq = spec->freq;
  iChannels = spec->channels;
  
  SDL_CalculateAudioSpec(spec);
  iBufSize = spec->size;

  
  SDL_memset(&(_this->hidden->MixSetupParms), 0, sizeof(MCI_MIXSETUP_PARMS));
  _this->hidden->MixSetupParms.ulBitsPerSample = iBits;
  _this->hidden->MixSetupParms.ulFormatTag = MCI_WAVE_FORMAT_PCM;
  _this->hidden->MixSetupParms.ulSamplesPerSec = iFreq;
  _this->hidden->MixSetupParms.ulChannels = iChannels;
  _this->hidden->MixSetupParms.ulFormatMode = MCI_PLAY;
  _this->hidden->MixSetupParms.ulDeviceType = MCI_DEVTYPE_WAVEFORM_AUDIO;
  _this->hidden->MixSetupParms.pmixEvent = DARTEventFunc;
  rc = mciSendCommand (iDeviceOrd, MCI_MIXSETUP,
                       MCI_WAIT | MCI_MIXSETUP_QUERYMODE,
                       &(_this->hidden->MixSetupParms), 0);
  if (rc!=MCIERR_SUCCESS)
  { 
    
    mciSendCommand(iDeviceOrd, MCI_CLOSE, MCI_WAIT, &GenericParms, 0);
    SDL_SetError("Audio device doesn't support requested audio format");
    return(-1);
  }
  
  rc = mciSendCommand(iDeviceOrd, MCI_MIXSETUP,
                      MCI_WAIT | MCI_MIXSETUP_INIT,
                      &(_this->hidden->MixSetupParms), 0);
  if (rc!=MCIERR_SUCCESS)
  { 
    
//.........这里部分代码省略.........
开发者ID:qtekfun，项目名称:htcDesire820Kernel，代码行数:101，代码来源:SDL_dart.c

示例15: PULSE_OpenAudio

static int PULSE_OpenAudio(_THIS, SDL_AudioSpec *spec)
{
	Uint16          test_format;
	pa_sample_spec  paspec;
	pa_buffer_attr  paattr;
	pa_channel_map  pacmap;
	
	paspec.format = PA_SAMPLE_INVALID;
	for ( test_format = SDL_FirstAudioFormat(spec->format); test_format; ) {
		switch ( test_format ) {
			case AUDIO_U8:
				paspec.format = PA_SAMPLE_U8;
				break;
			case AUDIO_S16LSB:
				paspec.format = PA_SAMPLE_S16LE;
				break;
			case AUDIO_S16MSB:
				paspec.format = PA_SAMPLE_S16BE;
				break;
		}
		if ( paspec.format != PA_SAMPLE_INVALID )
			break;
	}
	if (paspec.format == PA_SAMPLE_INVALID ) {
		SDL_SetError("Couldn't find any suitable audio formats");
		return(-1);
	}
	spec->format = test_format;
	
	paspec.channels = spec->channels;
	paspec.rate = spec->freq;

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

	/* Allocate mixing buffer */
	mixlen = spec->size;
	mixbuf = (Uint8 *)SDL_AllocAudioMem(mixlen);
	if ( mixbuf == NULL ) {
		return(-1);
	}
	SDL_memset(mixbuf, spec->silence, spec->size);
	
	/* Reduced prebuffering compared to the defaults. */
	paattr.tlength = mixlen;
	paattr.minreq = mixlen;
	paattr.fragsize = mixlen;
	paattr.prebuf = mixlen;
	paattr.maxlength = mixlen * 4;
	
	/* The SDL ALSA output hints us that we use Windows' channel mapping */
	/* http://bugzilla.libsdl.org/show_bug.cgi?id=110 */
	SDL_NAME(pa_channel_map_init_auto)(
		&pacmap, spec->channels, PA_CHANNEL_MAP_WAVEEX);
	
	/* Connect to the PulseAudio server */
	stream = SDL_NAME(pa_simple_new)(
		SDL_getenv("PASERVER"),      /* server */
		get_progname(),              /* application name */
		PA_STREAM_PLAYBACK,          /* playback mode */
		SDL_getenv("PADEVICE"),      /* device on the server */
		"Simple DirectMedia Layer",  /* stream description */
		&paspec,                     /* sample format spec */
		&pacmap,                     /* channel map */
		&paattr,                     /* buffering attributes */
		NULL                         /* error code */
	);
	if ( stream == NULL ) {
		PULSE_CloseAudio(this);
		SDL_SetError("Could not connect to PulseAudio");
		return(-1);
	}

	/* Get the parent process id (we're the parent of the audio thread) */
	parent = getpid();
	
	return(0);
}
开发者ID:RDCH106，项目名称:n64oid，代码行数:78，代码来源:SDL_pulseaudio.c


注：本文中的SDL_FirstAudioFormat函数示例由纯净天空整理自Github/MSDocs等开源代码及文档管理平台，相关代码片段筛选自各路编程大神贡献的开源项目，源码版权归原作者所有，传播和使用请参考对应项目的License；未经允许，请勿转载。