/* GStreamer * Copyright (C) 1999,2000 Erik Walthinsen * 2000 Wim Taymans * 2005 Wim Taymans * * gstbasesrc.h: * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library 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 * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ #ifndef __GST_BASE_SRC_H__ #define __GST_BASE_SRC_H__ #include G_BEGIN_DECLS #define GST_TYPE_BASE_SRC (gst_base_src_get_type()) #define GST_BASE_SRC(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_BASE_SRC,GstBaseSrc)) #define GST_BASE_SRC_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_BASE_SRC,GstBaseSrcClass)) #define GST_BASE_SRC_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GST_TYPE_BASE_SRC, GstBaseSrcClass)) #define GST_IS_BASE_SRC(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_BASE_SRC)) #define GST_IS_BASE_SRC_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_BASE_SRC)) #define GST_BASE_SRC_CAST(obj) ((GstBaseSrc *)(obj)) /** * GstBaseSrcFlags: * @GST_BASE_SRC_STARTED: has source been started * @GST_BASE_SRC_FLAG_LAST: offset to define more flags * * The #GstElement flags that a basesrc element may have. */ typedef enum { GST_BASE_SRC_STARTED = (GST_ELEMENT_FLAG_LAST << 0), /* padding */ GST_BASE_SRC_FLAG_LAST = (GST_ELEMENT_FLAG_LAST << 2) } GstBaseSrcFlags; typedef struct _GstBaseSrc GstBaseSrc; typedef struct _GstBaseSrcClass GstBaseSrcClass; typedef struct _GstBaseSrcPrivate GstBaseSrcPrivate; /** * GST_BASE_SRC_PAD: * @obj: base source instance * * Gives the pointer to the #GstPad object of the element. */ #define GST_BASE_SRC_PAD(obj) (GST_BASE_SRC_CAST (obj)->srcpad) /** * GstBaseSrc: * * The opaque #GstBaseSrc data structure. */ struct _GstBaseSrc { GstElement element; /*< protected >*/ GstPad *srcpad; /* available to subclass implementations */ /* MT-protected (with LIVE_LOCK) */ GMutex *live_lock; GCond *live_cond; gboolean is_live; gboolean live_running; /* MT-protected (with LOCK) */ gint blocksize; /* size of buffers when operating push based */ gboolean can_activate_push; /* some scheduling properties */ GstActivateMode pad_mode; gboolean seekable; /* not used anymore */ gboolean random_access; GstClockID clock_id; /* for syncing */ GstClockTime end_time; /* MT-protected (with STREAM_LOCK *and* OBJECT_LOCK) */ GstSegment segment; /* MT-protected (with STREAM_LOCK) */ gboolean need_newsegment; guint64 offset; /* current offset in the resource, unused */ guint64 size; /* total size of the resource, unused */ gint num_buffers; gint num_buffers_left; gboolean typefind; gboolean running; GstEvent *pending_seek; GstBaseSrcPrivate *priv; /*< private >*/ gpointer _gst_reserved[GST_PADDING_LARGE]; }; /** * GstBaseSrcClass: * @parent_class: Element parent class * @get_caps: Called to get the caps to report * @set_caps: Notify subclass of changed output caps * @negotiate: Negotiated the caps with the peer. * @newsegment: Generate and send a new_segment event (UNUSED) * @start: Start processing. Subclasses should open resources and prepare * to produce data. * @stop: Stop processing. Subclasses should use this to close resources. * @get_times: Given a buffer, return the start and stop time when it * should be pushed out. The base class will sync on the clock using * these times. * @get_size: Return the total size of the resource, in the configured format. * @is_seekable: Check if the source can seek * @unlock: Unlock any pending access to the resource. Subclasses should * unblock any blocked function ASAP. In particular, any create() function in * progress should be unblocked and should return GST_FLOW_WRONG_STATE. Any * future @create() function call should also return GST_FLOW_WRONG_STATE * until the @unlock_stop() function has been called. * @unlock_stop: Clear the previous unlock request. Subclasses should clear * any state they set during unlock(), such as clearing command queues. * @event: Override this to implement custom event handling. * @create: Ask the subclass to create a buffer with offset and size. * When the subclass returns GST_FLOW_OK, it MUST return a buffer of the * requested size unless fewer bytes are available because an EOS condition * is near. No buffer should be returned when the return value is different * from GST_FLOW_OK. A return value of GST_FLOW_UNEXPECTED signifies that the * end of stream is reached. * @do_seek: Perform seeking on the resource to the indicated segment. * @prepare_seek_segment: Prepare the GstSegment that will be passed to the * do_seek vmethod for executing a seek request. Sub-classes should override * this if they support seeking in formats other than the configured native * format. By default, it tries to convert the seek arguments to the * configured native format and prepare a segment in that format. * Since: 0.10.13 * @query: Handle a requested query. * @check_get_range: Check whether the source would support pull-based * operation if it were to be opened now. This vfunc is optional, but * should be implemented if possible to avoid unnecessary start/stop * cycles. The default implementation will open and close the resource * to find out whether get_range is supported, and that is usually * undesirable. * @fixate: Called during negotiation if caps need fixating. Implement instead of * setting a fixate function on the source pad. * * Subclasses can override any of the available virtual methods or not, as * needed. At the minimum, the @create method should be overridden to produce * buffers. */ struct _GstBaseSrcClass { GstElementClass parent_class; /*< public >*/ /* virtual methods for subclasses */ /* get caps from subclass */ GstCaps* (*get_caps) (GstBaseSrc *src, GstCaps *filter); /* notify the subclass of new caps */ gboolean (*set_caps) (GstBaseSrc *src, GstCaps *caps); /* decide on caps */ gboolean (*negotiate) (GstBaseSrc *src); /* called if, in negotiation, caps need fixating */ void (*fixate) (GstBaseSrc *src, GstCaps *caps); /* start and stop processing, ideal for opening/closing the resource */ gboolean (*start) (GstBaseSrc *src); gboolean (*stop) (GstBaseSrc *src); /* given a buffer, return start and stop time when it should be pushed * out. The base class will sync on the clock using these times. */ void (*get_times) (GstBaseSrc *src, GstBuffer *buffer, GstClockTime *start, GstClockTime *end); /* get the total size of the resource in bytes */ gboolean (*get_size) (GstBaseSrc *src, guint64 *size); /* check if the resource is seekable */ gboolean (*is_seekable) (GstBaseSrc *src); /* Prepare the segment on which to perform do_seek(), converting to the * current basesrc format. */ gboolean (*prepare_seek_segment) (GstBaseSrc *src, GstEvent *seek, GstSegment *segment); /* notify subclasses of a seek */ gboolean (*do_seek) (GstBaseSrc *src, GstSegment *segment); /* unlock any pending access to the resource. subclasses should unlock * any function ASAP. */ gboolean (*unlock) (GstBaseSrc *src); /* Clear any pending unlock request, as we succeeded in unlocking */ gboolean (*unlock_stop) (GstBaseSrc *src); /* notify subclasses of a query */ gboolean (*query) (GstBaseSrc *src, GstQuery *query); /* notify subclasses of an event */ gboolean (*event) (GstBaseSrc *src, GstEvent *event); /* ask the subclass to create a buffer with offset and size */ GstFlowReturn (*create) (GstBaseSrc *src, guint64 offset, guint size, GstBuffer **buf); /*< private >*/ gpointer _gst_reserved[GST_PADDING_LARGE]; }; GType gst_base_src_get_type (void); GstFlowReturn gst_base_src_wait_playing (GstBaseSrc *src); void gst_base_src_set_live (GstBaseSrc *src, gboolean live); gboolean gst_base_src_is_live (GstBaseSrc *src); void gst_base_src_set_format (GstBaseSrc *src, GstFormat format); gboolean gst_base_src_query_latency (GstBaseSrc *src, gboolean * live, GstClockTime * min_latency, GstClockTime * max_latency); void gst_base_src_set_blocksize (GstBaseSrc *src, gulong blocksize); gulong gst_base_src_get_blocksize (GstBaseSrc *src); void gst_base_src_set_do_timestamp (GstBaseSrc *src, gboolean timestamp); gboolean gst_base_src_get_do_timestamp (GstBaseSrc *src); gboolean gst_base_src_new_seamless_segment (GstBaseSrc *src, gint64 start, gint64 stop, gint64 position); G_END_DECLS #endif /* __GST_BASE_SRC_H__ */