diff options
Diffstat (limited to 'gst-libs/gst/mixer/mixer.h')
| -rw-r--r-- | gst-libs/gst/mixer/mixer.h | 88 |
1 files changed, 47 insertions, 41 deletions
diff --git a/gst-libs/gst/mixer/mixer.h b/gst-libs/gst/mixer/mixer.h index 565ba8db7..5639758e4 100644 --- a/gst-libs/gst/mixer/mixer.h +++ b/gst-libs/gst/mixer/mixer.h @@ -39,27 +39,33 @@ G_BEGIN_DECLS #define GST_MIXER_GET_CLASS(inst) \ (G_TYPE_INSTANCE_GET_INTERFACE ((inst), GST_TYPE_MIXER, GstMixerClass)) -/* I fully realise that this naming being used here is confusing. - * A channel is referred to both as the number of simultaneous - * sound streams the input can handle as well as the in-/output - * itself. We need to fix this some day, I just cannot come up - * with something better. +/* In this interface, a `track' is a unit of recording or playback, pretty much + * equivalent to what comes in or goes out through a GstPad. Each track can have + * one or more `channels', which are logical parts of the track. A `stereo + * track', then, would be one stream with two channels, while a `mono track' + * would be a stream with a single channel. More complex examples are possible + * as well ; for example, professional audio hardware might handle audio tracks + * with 8 or 16 channels each. + * + * All these are audio terms. I don't know exactly what this would translate to + * for video, but a track might be an entire video stream, and a channel might + * be the information for one of the colors in the stream. */ -#define GST_MIXER_CHANNEL_INPUT (1<<0) -#define GST_MIXER_CHANNEL_OUTPUT (1<<1) -#define GST_MIXER_CHANNEL_MUTE (1<<2) -#define GST_MIXER_CHANNEL_RECORD (1<<3) +#define GST_MIXER_TRACK_INPUT (1<<0) +#define GST_MIXER_TRACK_OUTPUT (1<<1) +#define GST_MIXER_TRACK_MUTE (1<<2) +#define GST_MIXER_TRACK_RECORD (1<<3) -typedef struct _GstMixerChannel { +typedef struct _GstMixerTrack { gchar *label; gint num_channels, flags, min_volume, max_volume; -} GstMixerChannel; +} GstMixerTrack; -#define GST_MIXER_CHANNEL_HAS_FLAG(channel, flag) \ - ((channel)->flags & flag) +#define GST_MIXER_TRACK_HAS_FLAG(track, flag) \ + ((track)->flags & flag) typedef struct _GstMixer GstMixer; @@ -67,21 +73,21 @@ typedef struct _GstMixerClass { GTypeInterface klass; /* virtual functions */ - const GList * (* list_channels) (GstMixer *mixer); - - void (* set_volume) (GstMixer *mixer, - GstMixerChannel *channel, - gint *volumes); - void (* get_volume) (GstMixer *mixer, - GstMixerChannel *channel, - gint *volumes); - - void (* set_mute) (GstMixer *mixer, - GstMixerChannel *channel, - gboolean mute); - void (* set_record) (GstMixer *mixer, - GstMixerChannel *channel, - gboolean record); + const GList * (* list_tracks) (GstMixer *mixer); + + void (* set_volume) (GstMixer *mixer, + GstMixerTrack *track, + gint *volumes); + void (* get_volume) (GstMixer *mixer, + GstMixerTrack *track, + gint *volumes); + + void (* set_mute) (GstMixer *mixer, + GstMixerTrack *track, + gboolean mute); + void (* set_record) (GstMixer *mixer, + GstMixerTrack *track, + gboolean record); GST_CLASS_PADDING } GstMixerClass; @@ -89,19 +95,19 @@ typedef struct _GstMixerClass { GType gst_mixer_get_type (void); /* virtual class function wrappers */ -const GList * gst_mixer_list_channels (GstMixer *mixer); -void gst_mixer_set_volume (GstMixer *mixer, - GstMixerChannel *channel, - gint *volumes); -void gst_mixer_get_volume (GstMixer *mixer, - GstMixerChannel *channel, - gint *volumes); -void gst_mixer_set_mute (GstMixer *mixer, - GstMixerChannel *channel, - gboolean mute); -void gst_mixer_set_record (GstMixer *mixer, - GstMixerChannel *channel, - gboolean record); +const GList * gst_mixer_list_tracks (GstMixer *mixer); +void gst_mixer_set_volume (GstMixer *mixer, + GstMixerTrack *track, + gint *volumes); +void gst_mixer_get_volume (GstMixer *mixer, + GstMixerTrack *track, + gint *volumes); +void gst_mixer_set_mute (GstMixer *mixer, + GstMixerTrack *track, + gboolean mute); +void gst_mixer_set_record (GstMixer *mixer, + GstMixerTrack *track, + gboolean record); G_END_DECLS |