diff options
-rw-r--r-- | sys/directsound/gstdirectsoundsink.c | 368 | ||||
-rw-r--r-- | sys/directsound/gstdirectsoundsink.h | 10 |
2 files changed, 149 insertions, 229 deletions
diff --git a/sys/directsound/gstdirectsoundsink.c b/sys/directsound/gstdirectsoundsink.c index fc766e5a1..49f2afa8a 100644 --- a/sys/directsound/gstdirectsoundsink.c +++ b/sys/directsound/gstdirectsoundsink.c @@ -52,6 +52,8 @@ #include "config.h" #endif +#include <gst/base/gstbasesink.h> +#include <gst/audio/streamvolume.h> #include "gstdirectsoundsink.h" #include <math.h> @@ -63,229 +65,85 @@ #endif #endif +#define DEFAULT_MUTE FALSE + GST_DEBUG_CATEGORY_STATIC (directsoundsink_debug); #define GST_CAT_DEFAULT directsoundsink_debug -static void gst_directsound_sink_finalise (GObject * object); +static void gst_directsound_sink_finalize (GObject * object); static void gst_directsound_sink_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec); static void gst_directsound_sink_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec); -static GstCaps *gst_directsound_sink_getcaps (GstBaseSink * bsink); +static GstCaps *gst_directsound_sink_getcaps (GstBaseSink * bsink, + GstCaps * filter); static gboolean gst_directsound_sink_prepare (GstAudioSink * asink, - GstRingBufferSpec * spec); + GstAudioRingBufferSpec * spec); static gboolean gst_directsound_sink_unprepare (GstAudioSink * asink); - static gboolean gst_directsound_sink_open (GstAudioSink * asink); static gboolean gst_directsound_sink_close (GstAudioSink * asink); -static guint gst_directsound_sink_write (GstAudioSink * asink, gpointer data, - guint length); +static gint gst_directsound_sink_write (GstAudioSink * asink, + gpointer data, guint length); static guint gst_directsound_sink_delay (GstAudioSink * asink); static void gst_directsound_sink_reset (GstAudioSink * asink); static GstCaps *gst_directsound_probe_supported_formats (GstDirectSoundSink * dsoundsink, const GstCaps * template_caps); -/* interfaces */ -static void gst_directsound_sink_interfaces_init (GType type); -static void -gst_directsound_sink_implements_interface_init (GstImplementsInterfaceClass * - iface); -static void gst_directsound_sink_mixer_interface_init (GstMixerInterface * - iface); +static void gst_directsound_sink_set_volume (GstDirectSoundSink * sink, + gdouble volume, gboolean store); +static gdouble gst_directsound_sink_get_volume (GstDirectSoundSink * sink); +static void gst_directsound_sink_set_mute (GstDirectSoundSink * sink, + gboolean mute); +static gboolean gst_directsound_sink_get_mute (GstDirectSoundSink * sink); static GstStaticPadTemplate directsoundsink_sink_factory = GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS, - GST_STATIC_CAPS ("audio/x-raw-int, " - "signed = (boolean) TRUE, " - "width = (int) 16, " - "depth = (int) 16, " + GST_STATIC_CAPS ("audio/x-raw, " + "format = (string) S16LE, " + "layout = (string) interleaved, " "rate = (int) [ 1, MAX ], " "channels = (int) [ 1, 2 ]; " - "audio/x-raw-int, " - "signed = (boolean) FALSE, " - "width = (int) 8, " - "depth = (int) 8, " + "audio/x-raw, " + "format = (string) S8, " + "layout = (string) interleaved, " "rate = (int) [ 1, MAX ], " "channels = (int) [ 1, 2 ];" "audio/x-iec958")); enum { PROP_0, - PROP_VOLUME + PROP_VOLUME, + PROP_MUTE }; -GST_BOILERPLATE_FULL (GstDirectSoundSink, gst_directsound_sink, GstAudioSink, - GST_TYPE_AUDIO_SINK, gst_directsound_sink_interfaces_init); - -/* interfaces stuff */ -static void -gst_directsound_sink_interfaces_init (GType type) -{ - static const GInterfaceInfo implements_interface_info = { - (GInterfaceInitFunc) gst_directsound_sink_implements_interface_init, - NULL, - NULL, - }; - - static const GInterfaceInfo mixer_interface_info = { - (GInterfaceInitFunc) gst_directsound_sink_mixer_interface_init, - NULL, - NULL, - }; - - g_type_add_interface_static (type, - GST_TYPE_IMPLEMENTS_INTERFACE, &implements_interface_info); - g_type_add_interface_static (type, GST_TYPE_MIXER, &mixer_interface_info); -} - -static gboolean -gst_directsound_sink_interface_supported (GstImplementsInterface * iface, - GType iface_type) -{ - g_return_val_if_fail (iface_type == GST_TYPE_MIXER, FALSE); - - /* for the sake of this example, we'll always support it. However, normally, - * you would check whether the device you've opened supports mixers. */ - return TRUE; -} - -static void -gst_directsound_sink_implements_interface_init (GstImplementsInterfaceClass * - iface) -{ - iface->supported = gst_directsound_sink_interface_supported; -} - -/* - * This function returns the list of support tracks (inputs, outputs) - * on this element instance. Elements usually build this list during - * _init () or when going from NULL to READY. - */ - -static const GList * -gst_directsound_sink_mixer_list_tracks (GstMixer * mixer) -{ - GstDirectSoundSink *dsoundsink = GST_DIRECTSOUND_SINK (mixer); - - return dsoundsink->tracks; -} - -static void -gst_directsound_sink_set_volume (GstDirectSoundSink * dsoundsink) -{ - if (dsoundsink->pDSBSecondary) { - /* DirectSound controls volume using units of 100th of a decibel, - * ranging from -10000 to 0. We use a linear scale of 0 - 100 - * here, so remap. - */ - long dsVolume; - if (dsoundsink->volume == 0) - dsVolume = -10000; - else - dsVolume = 100 * (long) (20 * log10 ((double) dsoundsink->volume / 100.)); - dsVolume = CLAMP (dsVolume, -10000, 0); - - GST_DEBUG_OBJECT (dsoundsink, - "Setting volume on secondary buffer to %d from %d", (int) dsVolume, - (int) dsoundsink->volume); - IDirectSoundBuffer_SetVolume (dsoundsink->pDSBSecondary, dsVolume); - } -} - -/* - * Set volume. volumes is an array of size track->num_channels, and - * each value in the array gives the wanted volume for one channel - * on the track. - */ +#define gst_directsound_sink_parent_class parent_class +G_DEFINE_TYPE_WITH_CODE (GstDirectSoundSink, gst_directsound_sink, + GST_TYPE_AUDIO_SINK, G_IMPLEMENT_INTERFACE (GST_TYPE_STREAM_VOLUME, NULL) + ); static void -gst_directsound_sink_mixer_set_volume (GstMixer * mixer, - GstMixerTrack * track, gint * volumes) +gst_directsound_sink_finalize (GObject * object) { - GstDirectSoundSink *dsoundsink = GST_DIRECTSOUND_SINK (mixer); - - if (volumes[0] != dsoundsink->volume) { - dsoundsink->volume = volumes[0]; - - gst_directsound_sink_set_volume (dsoundsink); - } -} - -static void -gst_directsound_sink_mixer_get_volume (GstMixer * mixer, - GstMixerTrack * track, gint * volumes) -{ - GstDirectSoundSink *dsoundsink = GST_DIRECTSOUND_SINK (mixer); - - volumes[0] = dsoundsink->volume; -} - -static void -gst_directsound_sink_mixer_interface_init (GstMixerInterface * iface) -{ - /* the mixer interface requires a definition of the mixer type: - * hardware or software? */ - GST_MIXER_TYPE (iface) = GST_MIXER_SOFTWARE; - - /* virtual function pointers */ - iface->list_tracks = gst_directsound_sink_mixer_list_tracks; - iface->set_volume = gst_directsound_sink_mixer_set_volume; - iface->get_volume = gst_directsound_sink_mixer_get_volume; -} - -static void -gst_directsound_sink_finalise (GObject * object) -{ - GstDirectSoundSink *dsoundsink = GST_DIRECTSOUND_SINK (object); - - g_mutex_free (dsoundsink->dsound_lock); - - if (dsoundsink->tracks) { - g_list_foreach (dsoundsink->tracks, (GFunc) g_object_unref, NULL); - g_list_free (dsoundsink->tracks); - dsoundsink->tracks = NULL; - } - G_OBJECT_CLASS (parent_class)->finalize (object); } static void -gst_directsound_sink_base_init (gpointer g_class) -{ - GstElementClass *element_class = GST_ELEMENT_CLASS (g_class); - - gst_element_class_set_details_simple (element_class, - "Direct Sound Audio Sink", "Sink/Audio", - "Output to a sound card via Direct Sound", - "Sebastien Moutte <sebastien@moutte.net>"); - gst_element_class_add_pad_template (element_class, - gst_static_pad_template_get (&directsoundsink_sink_factory)); -} - -static void gst_directsound_sink_class_init (GstDirectSoundSinkClass * klass) { - GObjectClass *gobject_class; - GstElementClass *gstelement_class; - GstBaseSinkClass *gstbasesink_class; - GstBaseAudioSinkClass *gstbaseaudiosink_class; - GstAudioSinkClass *gstaudiosink_class; - - gobject_class = (GObjectClass *) klass; - gstelement_class = (GstElementClass *) klass; - gstbasesink_class = (GstBaseSinkClass *) klass; - gstbaseaudiosink_class = (GstBaseAudioSinkClass *) klass; - gstaudiosink_class = (GstAudioSinkClass *) klass; + GObjectClass *gobject_class = G_OBJECT_CLASS (klass); + GstBaseSinkClass *gstbasesink_class = GST_BASE_SINK_CLASS (klass); + GstAudioSinkClass *gstaudiosink_class = GST_AUDIO_SINK_CLASS (klass); + GstElementClass *element_class = GST_ELEMENT_CLASS (klass); GST_DEBUG_CATEGORY_INIT (directsoundsink_debug, "directsoundsink", 0, "DirectSound sink"); parent_class = g_type_class_peek_parent (klass); - gobject_class->finalize = gst_directsound_sink_finalise; + gobject_class->finalize = gst_directsound_sink_finalize; gobject_class->set_property = gst_directsound_sink_set_property; gobject_class->get_property = gst_directsound_sink_get_property; @@ -307,23 +165,27 @@ gst_directsound_sink_class_init (GstDirectSoundSinkClass * klass) g_param_spec_double ("volume", "Volume", "Volume of this stream", 0.0, 1.0, 1.0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); + + g_object_class_install_property (gobject_class, + PROP_MUTE, + g_param_spec_boolean ("mute", "Mute", + "Mute state of this stream", DEFAULT_MUTE, + G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); + + gst_element_class_set_details_simple (element_class, + "Direct Sound Audio Sink", "Sink/Audio", + "Output to a sound card via Direct Sound", + "Sebastien Moutte <sebastien@moutte.net>"); + + gst_element_class_add_pad_template (element_class, + gst_static_pad_template_get (&directsoundsink_sink_factory)); } static void -gst_directsound_sink_init (GstDirectSoundSink * dsoundsink, - GstDirectSoundSinkClass * g_class) +gst_directsound_sink_init (GstDirectSoundSink * dsoundsink) { - GstMixerTrack *track = NULL; - - dsoundsink->tracks = NULL; - track = g_object_new (GST_TYPE_MIXER_TRACK, NULL); - track->label = g_strdup ("DSoundTrack"); - track->num_channels = 2; - track->min_volume = 0; - track->max_volume = 100; - track->flags = GST_MIXER_TRACK_OUTPUT; - dsoundsink->tracks = g_list_append (dsoundsink->tracks, track); - + dsoundsink->volume = 100; + dsoundsink->mute = FALSE; dsoundsink->pDS = NULL; dsoundsink->cached_caps = NULL; dsoundsink->pDSBSecondary = NULL; @@ -342,8 +204,10 @@ gst_directsound_sink_set_property (GObject * object, switch (prop_id) { case PROP_VOLUME: - sink->volume = (int) (g_value_get_double (value) * 100); - gst_directsound_sink_set_volume (sink); + gst_directsound_sink_set_volume (sink, g_value_get_double (value), TRUE); + break; + case PROP_MUTE: + gst_directsound_sink_set_mute (sink, g_value_get_boolean (value)); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); @@ -359,7 +223,10 @@ gst_directsound_sink_get_property (GObject * object, switch (prop_id) { case PROP_VOLUME: - g_value_set_double (value, (double) sink->volume / 100.); + g_value_set_double (value, gst_directsound_sink_get_volume (sink)); + break; + case PROP_MUTE: + g_value_set_boolean (value, gst_directsound_sink_get_mute (sink)); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); @@ -368,7 +235,7 @@ gst_directsound_sink_get_property (GObject * object, } static GstCaps * -gst_directsound_sink_getcaps (GstBaseSink * bsink) +gst_directsound_sink_getcaps (GstBaseSink * bsink, GstCaps * filter) { GstElementClass *element_class; GstPadTemplate *pad_template; @@ -410,9 +277,11 @@ gst_directsound_sink_getcaps (GstBaseSink * bsink) static gboolean gst_directsound_sink_open (GstAudioSink * asink) { - GstDirectSoundSink *dsoundsink = GST_DIRECTSOUND_SINK (asink); + GstDirectSoundSink *dsoundsink; HRESULT hRes; + dsoundsink = GST_DIRECTSOUND_SINK (asink); + /* create and initialize a DirecSound object */ if (FAILED (hRes = DirectSoundCreate (NULL, &dsoundsink->pDS, NULL))) { GST_ELEMENT_ERROR (dsoundsink, RESOURCE, OPEN_READ, @@ -433,47 +302,50 @@ gst_directsound_sink_open (GstAudioSink * asink) } static gboolean -gst_directsound_sink_prepare (GstAudioSink * asink, GstRingBufferSpec * spec) +gst_directsound_sink_prepare (GstAudioSink * asink, + GstAudioRingBufferSpec * spec) { - GstDirectSoundSink *dsoundsink = GST_DIRECTSOUND_SINK (asink); + GstDirectSoundSink *dsoundsink; HRESULT hRes; DSBUFFERDESC descSecondary; WAVEFORMATEX wfx; + dsoundsink = GST_DIRECTSOUND_SINK (asink); + /*save number of bytes per sample and buffer format */ - dsoundsink->bytes_per_sample = spec->bytes_per_sample; - dsoundsink->buffer_format = spec->format; + dsoundsink->bytes_per_sample = spec->info.bpf; + dsoundsink->type = spec->type; /* fill the WAVEFORMATEX structure with spec params */ memset (&wfx, 0, sizeof (wfx)); - if (spec->format != GST_IEC958) { + if (spec->type != GST_AUDIO_RING_BUFFER_FORMAT_TYPE_IEC958) { wfx.cbSize = sizeof (wfx); wfx.wFormatTag = WAVE_FORMAT_PCM; - wfx.nChannels = spec->channels; - wfx.nSamplesPerSec = spec->rate; - wfx.wBitsPerSample = (spec->bytes_per_sample * 8) / wfx.nChannels; - wfx.nBlockAlign = spec->bytes_per_sample; + wfx.nChannels = spec->info.channels; + wfx.nSamplesPerSec = spec->info.rate; + wfx.wBitsPerSample = (spec->info.bpf * 8) / wfx.nChannels; + wfx.nBlockAlign = spec->info.bpf; wfx.nAvgBytesPerSec = wfx.nSamplesPerSec * wfx.nBlockAlign; - /* Create directsound buffer with size based on our configured + /* Create directsound buffer with size based on our configured * buffer_size (which is 200 ms by default) */ dsoundsink->buffer_size = gst_util_uint64_scale_int (wfx.nAvgBytesPerSec, spec->buffer_time, GST_MSECOND); /* Make sure we make those numbers multiple of our sample size in bytes */ - dsoundsink->buffer_size += dsoundsink->buffer_size % spec->bytes_per_sample; + dsoundsink->buffer_size += dsoundsink->buffer_size % spec->info.bpf; spec->segsize = gst_util_uint64_scale_int (wfx.nAvgBytesPerSec, spec->latency_time, GST_MSECOND); - spec->segsize += spec->segsize % spec->bytes_per_sample; + spec->segsize += spec->segsize % spec->info.bpf; spec->segtotal = dsoundsink->buffer_size / spec->segsize; } else { #ifdef WAVE_FORMAT_DOLBY_AC3_SPDIF wfx.cbSize = 0; wfx.wFormatTag = WAVE_FORMAT_DOLBY_AC3_SPDIF; wfx.nChannels = 2; - wfx.nSamplesPerSec = spec->rate; + wfx.nSamplesPerSec = spec->info.rate; wfx.wBitsPerSample = 16; wfx.nBlockAlign = wfx.wBitsPerSample / 8 * wfx.nChannels; wfx.nAvgBytesPerSec = wfx.nSamplesPerSec * wfx.nBlockAlign; @@ -491,15 +363,15 @@ gst_directsound_sink_prepare (GstAudioSink * asink, GstRingBufferSpec * spec) GST_INFO_OBJECT (dsoundsink, "GstRingBufferSpec->channels: %d, GstRingBufferSpec->rate: %d, GstRingBufferSpec->bytes_per_sample: %d\n" "WAVEFORMATEX.nSamplesPerSec: %ld, WAVEFORMATEX.wBitsPerSample: %d, WAVEFORMATEX.nBlockAlign: %d, WAVEFORMATEX.nAvgBytesPerSec: %ld\n" - "Size of dsound circular buffer=>%d\n", spec->channels, spec->rate, - spec->bytes_per_sample, wfx.nSamplesPerSec, wfx.wBitsPerSample, + "Size of dsound circular buffer=>%d\n", spec->info.channels, + spec->info.rate, spec->info.bpf, wfx.nSamplesPerSec, wfx.wBitsPerSample, wfx.nBlockAlign, wfx.nAvgBytesPerSec, dsoundsink->buffer_size); /* create a secondary directsound buffer */ memset (&descSecondary, 0, sizeof (DSBUFFERDESC)); descSecondary.dwSize = sizeof (DSBUFFERDESC); descSecondary.dwFlags = DSBCAPS_GETCURRENTPOSITION2 | DSBCAPS_GLOBALFOCUS; - if (spec->format != GST_IEC958) + if (spec->type != GST_AUDIO_RING_BUFFER_FORMAT_TYPE_IEC958) descSecondary.dwFlags |= DSBCAPS_CTRLVOLUME; descSecondary.dwBufferBytes = dsoundsink->buffer_size; @@ -514,7 +386,7 @@ gst_directsound_sink_prepare (GstAudioSink * asink, GstRingBufferSpec * spec) return FALSE; } - gst_directsound_sink_set_volume (dsoundsink); + gst_directsound_sink_set_volume (dsoundsink, dsoundsink->volume, FALSE); return TRUE; } @@ -552,7 +424,7 @@ gst_directsound_sink_close (GstAudioSink * asink) return TRUE; } -static guint +static gint gst_directsound_sink_write (GstAudioSink * asink, gpointer data, guint length) { GstDirectSoundSink *dsoundsink; @@ -565,7 +437,7 @@ gst_directsound_sink_write (GstAudioSink * asink, gpointer data, guint length) dsoundsink = GST_DIRECTSOUND_SINK (asink); /* Fix endianness */ - if (dsoundsink->buffer_format == GST_IEC958) + if (dsoundsink->type == GST_AUDIO_RING_BUFFER_FORMAT_TYPE_IEC958) _swab (data, data, length); GST_DSOUND_LOCK (dsoundsink); @@ -720,12 +592,12 @@ gst_directsound_sink_reset (GstAudioSink * asink) GST_DSOUND_UNLOCK (dsoundsink); } -/* - * gst_directsound_probe_supported_formats: - * - * Takes the template caps and returns the subset which is actually - * supported by this device. - * +/* + * gst_directsound_probe_supported_formats: + * + * Takes the template caps and returns the subset which is actually + * supported by this device. + * */ static GstCaps * @@ -739,8 +611,8 @@ gst_directsound_probe_supported_formats (GstDirectSoundSink * dsoundsink, caps = gst_caps_copy (template_caps); - /* - * Check availability of digital output by trying to create an SPDIF buffer + /* + * Check availability of digital output by trying to create an SPDIF buffer */ #ifdef WAVE_FORMAT_DOLBY_AC3_SPDIF @@ -754,7 +626,7 @@ gst_directsound_probe_supported_formats (GstDirectSoundSink * dsoundsink, wfx.nBlockAlign = 4; wfx.nAvgBytesPerSec = wfx.nSamplesPerSec * wfx.nBlockAlign; - // create a secondary directsound buffer + // create a secondary directsound buffer memset (&descSecondary, 0, sizeof (DSBUFFERDESC)); descSecondary.dwSize = sizeof (DSBUFFERDESC); descSecondary.dwFlags = DSBCAPS_GETCURRENTPOSITION2 | DSBCAPS_GLOBALFOCUS; @@ -768,7 +640,7 @@ gst_directsound_probe_supported_formats (GstDirectSoundSink * dsoundsink, "(IDirectSound_CreateSoundBuffer returned: %s)\n", DXGetErrorString9 (hRes)); caps = - gst_caps_subtract (caps, gst_caps_new_simple ("audio/x-iec958", NULL)); + gst_caps_subtract (caps, gst_caps_new_empty_simple ("audio/x-iec958")); } else { GST_INFO_OBJECT (dsoundsink, "AC3 passthrough supported"); hRes = IDirectSoundBuffer_Release (dsoundsink->pDSBSecondary); @@ -784,3 +656,53 @@ gst_directsound_probe_supported_formats (GstDirectSoundSink * dsoundsink, return caps; } + +static void +gst_directsound_sink_set_volume (GstDirectSoundSink * dsoundsink, + gdouble dvolume, gboolean store) +{ + glong volume; + + volume = dvolume * 100; + if (store) + dsoundsink->volume = volume; + + if (dsoundsink->pDSBSecondary) { + /* DirectSound controls volume using units of 100th of a decibel, + * ranging from -10000 to 0. We use a linear scale of 0 - 100 + * here, so remap. + */ + long dsVolume; + if (dsoundsink->volume == 0) + dsVolume = -10000; + else + dsVolume = 100 * (long) (20 * log10 ((double) dsoundsink->volume / 100.)); + dsVolume = CLAMP (dsVolume, -10000, 0); + + GST_DEBUG_OBJECT (dsoundsink, + "Setting volume on secondary buffer to %d from %d", (int) dsVolume, + (int) dsoundsink->volume); + IDirectSoundBuffer_SetVolume (dsoundsink->pDSBSecondary, dsVolume); + } +} + +gdouble +gst_directsound_sink_get_volume (GstDirectSoundSink * dsoundsink) +{ + return (gdouble) dsoundsink->volume / 100; +} + +static void +gst_directsound_sink_set_mute (GstDirectSoundSink * dsoundsink, gboolean mute) +{ + if (mute) + gst_directsound_sink_set_volume (dsoundsink, 0, FALSE); + else + gst_directsound_sink_set_volume (dsoundsink, dsoundsink->volume, FALSE); +} + +static gboolean +gst_directsound_sink_get_mute (GstDirectSoundSink * dsoundsink) +{ + return FALSE; +} diff --git a/sys/directsound/gstdirectsoundsink.h b/sys/directsound/gstdirectsoundsink.h index 8bb10bf34..0fb383d49 100644 --- a/sys/directsound/gstdirectsoundsink.h +++ b/sys/directsound/gstdirectsoundsink.h @@ -31,7 +31,7 @@ #include <gst/gst.h> #include <gst/audio/gstaudiosink.h> -#include <gst/interfaces/mixer.h> +#include "gstdirectsoundringbuffer.h" #include <windows.h> #include <dxerr9.h> @@ -56,6 +56,7 @@ struct _GstDirectSoundSink { GstAudioSink sink; + /* directsound object interface pointer */ LPDIRECTSOUND pDS; @@ -72,18 +73,15 @@ struct _GstDirectSoundSink /* current volume setup by mixer interface */ glong volume; - - /* tracks list of our mixer interface implementation */ - GList *tracks; + gboolean mute; GstCaps *cached_caps; - /* lock used to protect writes and resets */ GMutex *dsound_lock; gboolean first_buffer_after_reset; - GstBufferFormat buffer_format; + GstAudioRingBufferFormatType type; }; struct _GstDirectSoundSinkClass |