#ifndef __GST_ELEMENT_H__
#define __GST_ELEMENT_H__
-/* gstelement.h and gstelementfactory.h include eachother */
+#include <glib.h>
+
+G_BEGIN_DECLS
+
+/* gstelement.h and gstelementfactory.h include each other */
typedef struct _GstElement GstElement;
typedef struct _GstElementClass GstElementClass;
GST_STATE_PLAYING = 4
} GstState;
-
-#include <gst/gstconfig.h>
-#include <gst/gstobject.h>
-#include <gst/gstpad.h>
-#include <gst/gstbus.h>
-#include <gst/gstclock.h>
-#include <gst/gstelementfactory.h>
-#include <gst/gstplugin.h>
-#include <gst/gstpluginfeature.h>
-#include <gst/gstiterator.h>
-#include <gst/gstmessage.h>
-#include <gst/gstquery.h>
-#include <gst/gsttaglist.h>
-
-G_BEGIN_DECLS
-
#define GST_TYPE_ELEMENT (gst_element_get_type ())
#define GST_IS_ELEMENT(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_ELEMENT))
#define GST_IS_ELEMENT_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GST_TYPE_ELEMENT))
* cannot produce data in %GST_STATE_PAUSED.
* This typically happens with live sources.
*
- * The possible return values from a state change function such as
+ * The possible return values from a state change function such as
* gst_element_set_state(). Only @GST_STATE_CHANGE_FAILURE is a real failure.
*/
typedef enum {
GST_STATE_CHANGE_NO_PREROLL = 3
} GstStateChangeReturn;
+#include <gst/gstconfig.h>
+#include <gst/gstobject.h>
+#include <gst/gstpad.h>
+#include <gst/gstbus.h>
+#include <gst/gstclock.h>
+#include <gst/gstelementfactory.h>
+#include <gst/gstplugin.h>
+#include <gst/gstpluginfeature.h>
+#include <gst/gstiterator.h>
+#include <gst/gstmessage.h>
+#include <gst/gstquery.h>
+#include <gst/gsttaglist.h>
+#include <gst/gstcontext.h>
+
/* NOTE: this probably should be done with an #ifdef to decide
* whether to safe-cast or to just do the non-checking cast.
*/
/**
* GstStateChange:
* @GST_STATE_CHANGE_NULL_TO_READY : state change from NULL to READY.
- * <itemizedlist>
- * <listitem><para>
- * The element must check if the resources it needs are available. Device
+ * * The element must check if the resources it needs are available. Device
* sinks and -sources typically try to probe the device to constrain their
* caps.
- * </para></listitem>
- * <listitem><para>
- * The element opens the device (in case feature need to be probed).
- * </para></listitem>
- * </itemizedlist>
+ * * The element opens the device (in case feature need to be probed).
* @GST_STATE_CHANGE_READY_TO_PAUSED : state change from READY to PAUSED.
- * <itemizedlist>
- * <listitem><para>
- * The element pads are activated in order to receive data in PAUSED.
+ * * The element pads are activated in order to receive data in PAUSED.
* Streaming threads are started.
- * </para></listitem>
- * <listitem><para>
- * Some elements might need to return %GST_STATE_CHANGE_ASYNC and complete
+ * * Some elements might need to return %GST_STATE_CHANGE_ASYNC and complete
* the state change when they have enough information. It is a requirement
* for sinks to return %GST_STATE_CHANGE_ASYNC and complete the state change
* when they receive the first buffer or %GST_EVENT_EOS (preroll).
* Sinks also block the dataflow when in PAUSED.
- * </para></listitem>
- * <listitem><para>
- * A pipeline resets the running_time to 0.
- * </para></listitem>
- * <listitem><para>
- * Live sources return %GST_STATE_CHANGE_NO_PREROLL and don't generate data.
- * </para></listitem>
- * </itemizedlist>
+ * * A pipeline resets the running_time to 0.
+ * * Live sources return %GST_STATE_CHANGE_NO_PREROLL and don't generate data.
* @GST_STATE_CHANGE_PAUSED_TO_PLAYING: state change from PAUSED to PLAYING.
- * <itemizedlist>
- * <listitem><para>
- * Most elements ignore this state change.
- * </para></listitem>
- * <listitem><para>
- * The pipeline selects a #GstClock and distributes this to all the children
+ * * Most elements ignore this state change.
+ * * The pipeline selects a #GstClock and distributes this to all the children
* before setting them to PLAYING. This means that it is only allowed to
* synchronize on the #GstClock in the PLAYING state.
- * </para></listitem>
- * <listitem><para>
- * The pipeline uses the #GstClock and the running_time to calculate the
+ * * The pipeline uses the #GstClock and the running_time to calculate the
* base_time. The base_time is distributed to all children when performing
* the state change.
- * </para></listitem>
- * <listitem><para>
- * Sink elements stop blocking on the preroll buffer or event and start
+ * * Sink elements stop blocking on the preroll buffer or event and start
* rendering the data.
- * </para></listitem>
- * <listitem><para>
- * Sinks can post %GST_MESSAGE_EOS in the PLAYING state. It is not allowed
+ * * Sinks can post %GST_MESSAGE_EOS in the PLAYING state. It is not allowed
* to post %GST_MESSAGE_EOS when not in the PLAYING state.
- * </para></listitem>
- * <listitem><para>
- * While streaming in PAUSED or PLAYING elements can create and remove
+ * * While streaming in PAUSED or PLAYING elements can create and remove
* sometimes pads.
- * </para></listitem>
- * <listitem><para>
- * Live sources start generating data and return %GST_STATE_CHANGE_SUCCESS.
- * </para></listitem>
- * </itemizedlist>
+ * * Live sources start generating data and return %GST_STATE_CHANGE_SUCCESS.
* @GST_STATE_CHANGE_PLAYING_TO_PAUSED: state change from PLAYING to PAUSED.
- * <itemizedlist>
- * <listitem><para>
- * Most elements ignore this state change.
- * </para></listitem>
- * <listitem><para>
- * The pipeline calculates the running_time based on the last selected
+ * * Most elements ignore this state change.
+ * * The pipeline calculates the running_time based on the last selected
* #GstClock and the base_time. It stores this information to continue
* playback when going back to the PLAYING state.
- * </para></listitem>
- * <listitem><para>
- * Sinks unblock any #GstClock wait calls.
- * </para></listitem>
- * <listitem><para>
- * When a sink does not have a pending buffer to play, it returns
- * %GST_STATE_CHANGE_ASYNC from this state change and completes the state
+ * * Sinks unblock any #GstClock wait calls.
+ * * When a sink does not have a pending buffer to play, it returns
+ * #GST_STATE_CHANGE_ASYNC from this state change and completes the state
* change when it receives a new buffer or an %GST_EVENT_EOS.
- * </para></listitem>
- * <listitem><para>
- * Any queued %GST_MESSAGE_EOS items are removed since they will be reposted
+ * * Any queued %GST_MESSAGE_EOS items are removed since they will be reposted
* when going back to the PLAYING state. The EOS messages are queued in
* #GstBin containers.
- * </para></listitem>
- * <listitem><para>
- * Live sources stop generating data and return %GST_STATE_CHANGE_NO_PREROLL.
- * </para></listitem>
- * </itemizedlist>
+ * * Live sources stop generating data and return %GST_STATE_CHANGE_NO_PREROLL.
* @GST_STATE_CHANGE_PAUSED_TO_READY : state change from PAUSED to READY.
- * <itemizedlist>
- * <listitem><para>
- * Sinks unblock any waits in the preroll.
- * </para></listitem>
- * <listitem><para>
- * Elements unblock any waits on devices
- * </para></listitem>
- * <listitem><para>
- * Chain or get_range functions return %GST_FLOW_FLUSHING.
- * </para></listitem>
- * <listitem><para>
- * The element pads are deactivated so that streaming becomes impossible and
+ * * Sinks unblock any waits in the preroll.
+ * * Elements unblock any waits on devices
+ * * Chain or get_range functions return %GST_FLOW_FLUSHING.
+ * * The element pads are deactivated so that streaming becomes impossible and
* all streaming threads are stopped.
- * </para></listitem>
- * <listitem><para>
- * The sink forgets all negotiated formats
- * </para></listitem>
- * <listitem><para>
- * Elements remove all sometimes pads
- * </para></listitem>
- * </itemizedlist>
+ * * The sink forgets all negotiated formats
+ * * Elements remove all sometimes pads
* @GST_STATE_CHANGE_READY_TO_NULL : state change from READY to NULL.
- * <itemizedlist>
- * <listitem><para>
- * Elements close devices
- * </para></listitem>
- * <listitem><para>
- * Elements reset any internal state.
- * </para></listitem>
- * </itemizedlist>
+ * * Elements close devices
+ * * Elements reset any internal state.
+ * @GST_STATE_CHANGE_NULL_TO_NULL : state change from NULL to NULL. (Since: 1.14)
+ * @GST_STATE_CHANGE_READY_TO_READY : state change from READY to READY,
+ * This might happen when going to PAUSED asynchronously failed, in that case
+ * elements should make sure they are in a proper, coherent READY state. (Since: 1.14)
+ * @GST_STATE_CHANGE_PAUSED_TO_PAUSED : state change from PAUSED to PAUSED.
+ * This might happen when elements were in PLAYING state and 'lost state',
+ * they should make sure to go back to real 'PAUSED' state (prerolling for example). (Since: 1.14)
+ * @GST_STATE_CHANGE_PLAYING_TO_PLAYING : state change from PLAYING to PLAYING. (Since: 1.14)
*
* These are the different state changes an element goes through.
* %GST_STATE_NULL ⇒ %GST_STATE_PLAYING is called an upwards state change
GST_STATE_CHANGE_PAUSED_TO_PLAYING = (GST_STATE_PAUSED<<3) | GST_STATE_PLAYING,
GST_STATE_CHANGE_PLAYING_TO_PAUSED = (GST_STATE_PLAYING<<3) | GST_STATE_PAUSED,
GST_STATE_CHANGE_PAUSED_TO_READY = (GST_STATE_PAUSED<<3) | GST_STATE_READY,
- GST_STATE_CHANGE_READY_TO_NULL = (GST_STATE_READY<<3) | GST_STATE_NULL
+ GST_STATE_CHANGE_READY_TO_NULL = (GST_STATE_READY<<3) | GST_STATE_NULL,
+ GST_STATE_CHANGE_NULL_TO_NULL = (GST_STATE_NULL<<3) | GST_STATE_NULL,
+ GST_STATE_CHANGE_READY_TO_READY = (GST_STATE_READY<<3) | GST_STATE_READY,
+ GST_STATE_CHANGE_PAUSED_TO_PAUSED = (GST_STATE_PAUSED<<3) | GST_STATE_PAUSED,
+ GST_STATE_CHANGE_PLAYING_TO_PLAYING = (GST_STATE_PLAYING<<3) | GST_STATE_PLAYING
} GstStateChange;
/**
*/
#define GST_ELEMENT_START_TIME(elem) (GST_ELEMENT_CAST(elem)->start_time)
-GstStructure *gst_element_message_details_new(const char *name, ...);
-#define GST_ELEMENT_MESSAGE_MAKE_DETAILS(args) gst_element_message_details_new args
+GST_API
+GstStructure *gst_make_element_message_details (const char *name, ...);
+
+#define GST_ELEMENT_MESSAGE_MAKE_DETAILS(args) gst_make_element_message_details args
+
+/**
+ * GST_ELEMENT_FLOW_ERROR:
+ * @el: the element that generates the error
+ * @flow_return: the GstFlowReturn leading to that ERROR message
+ *
+ * Utility function that elements can use in case they encountered a fatal
+ * data processing error due to wrong flow processing.
+ *
+ * Since: 1.10
+ */
+#define GST_ELEMENT_FLOW_ERROR(el,flow_return) \
+G_STMT_START { \
+ GST_ELEMENT_ERROR_WITH_DETAILS (el, STREAM, FAILED, \
+ ("Internal data stream error."), \
+ ("streaming stopped, reason %s (%d)", gst_flow_get_name (flow_return), flow_return), \
+ ("flow-return", G_TYPE_INT, flow_return, NULL));\
+} G_STMT_END
/**
* GST_ELEMENT_ERROR_WITH_DETAILS:
parentheses)
* @debug: debugging information for the message (format string and args
enclosed in parentheses)
- * @args optional name, type, value triplets, which will be stored
+ * @args: optional name, type, value triplets, which will be stored
* in the associated GstStructure. NULL terminator required.
* Must be enclosed within parentheses.
*
*
* Since: 1.10
*/
-#define GST_ELEMENT_ERROR_WITH_DETAILS(el, domain, code, text, debug, args) \
+#define GST_ELEMENT_ERROR_WITH_DETAILS(el,domain,code,text,debug,args) \
G_STMT_START { \
gchar *__txt = _gst_element_error_printf text; \
gchar *__dbg = _gst_element_error_printf debug; \
* data processing error. The pipeline will post an error message and the
* application will be requested to stop further media processing.
*/
-#define GST_ELEMENT_ERROR(el, domain, code, text, debug) \
- GST_ELEMENT_ERROR_WITH_DETAILS(el, domain, code, text, debug, (NULL))
+#define GST_ELEMENT_ERROR(el,domain,code,text,debug) \
+G_STMT_START { \
+ gchar *__txt = _gst_element_error_printf text; \
+ gchar *__dbg = _gst_element_error_printf debug; \
+ if (__txt) \
+ GST_WARNING_OBJECT (el, "error: %s", __txt); \
+ if (__dbg) \
+ GST_WARNING_OBJECT (el, "error: %s", __dbg); \
+ gst_element_message_full (GST_ELEMENT(el), \
+ GST_MESSAGE_ERROR, GST_ ## domain ## _ERROR, \
+ GST_ ## domain ## _ERROR_ ## code, __txt, __dbg, __FILE__, \
+ GST_FUNCTION, __LINE__); \
+} G_STMT_END
/**
* GST_ELEMENT_WARNING_WITH_DETAILS:
parentheses)
* @debug: debugging information for the message (format string and args
enclosed in parentheses)
- * @args optional name, type, value triplets, which will be stored
+ * @args: optional name, type, value triplets, which will be stored
* in the associated GstStructure. NULL terminator required.
* Must be enclosed within parentheses.
*
* application will be informed.
*/
#define GST_ELEMENT_WARNING(el, domain, code, text, debug) \
- GST_ELEMENT_WARNING_WITH_DETAILS(el, domain, code, text, debug, (NULL))
+G_STMT_START { \
+ gchar *__txt = _gst_element_error_printf text; \
+ gchar *__dbg = _gst_element_error_printf debug; \
+ if (__txt) \
+ GST_WARNING_OBJECT (el, "warning: %s", __txt); \
+ if (__dbg) \
+ GST_WARNING_OBJECT (el, "warning: %s", __dbg); \
+ gst_element_message_full (GST_ELEMENT(el), \
+ GST_MESSAGE_WARNING, GST_ ## domain ## _ERROR, \
+ GST_ ## domain ## _ERROR_ ## code, __txt, __dbg, __FILE__, \
+ GST_FUNCTION, __LINE__); \
+} G_STMT_END
/**
* GST_ELEMENT_INFO_WITH_DETAILS:
parentheses)
* @debug: debugging information for the message (format string and args
enclosed in parentheses)
- * @args optional name, type, value triplets, which will be stored
+ * @args: optional name, type, value triplets, which will be stored
* in the associated GstStructure. NULL terminator required.
* Must be enclosed within parentheses.
*
* application will be informed.
*/
#define GST_ELEMENT_INFO(el, domain, code, text, debug) \
- GST_ELEMENT_INFO_WITH_DETAILS(el, domain, code, text, debug, (NULL))
+G_STMT_START { \
+ gchar *__txt = _gst_element_error_printf text; \
+ gchar *__dbg = _gst_element_error_printf debug; \
+ if (__txt) \
+ GST_INFO_OBJECT (el, "info: %s", __txt); \
+ if (__dbg) \
+ GST_INFO_OBJECT (el, "info: %s", __dbg); \
+ gst_element_message_full (GST_ELEMENT(el), \
+ GST_MESSAGE_INFO, GST_ ## domain ## _ERROR, \
+ GST_ ## domain ## _ERROR_ ## code, __txt, __dbg, __FILE__, \
+ GST_FUNCTION, __LINE__); \
+} G_STMT_END
/* the state change mutexes and conds */
/**
* @numsinkpads: number of sink pads of the element.
* @sinkpads: (element-type Gst.Pad): list of sink pads
* @pads_cookie: updated whenever the a pad is added or removed
+ * @contexts: (element-type Gst.Context): list of contexts
*
* GStreamer element abstract base class.
*/
};
/* element class pad templates */
+
+GST_API
void gst_element_class_add_pad_template (GstElementClass *klass, GstPadTemplate *templ);
+GST_API
void gst_element_class_add_static_pad_template (GstElementClass *klass, GstStaticPadTemplate *static_templ);
+GST_API
+void gst_element_class_add_static_pad_template_with_gtype (GstElementClass *klass,
+ GstStaticPadTemplate *static_templ,
+ GType pad_type);
+
+GST_API
GstPadTemplate* gst_element_class_get_pad_template (GstElementClass *element_class, const gchar *name);
+
+GST_API
GList* gst_element_class_get_pad_template_list (GstElementClass *element_class);
/* element class meta data */
+
+GST_API
void gst_element_class_set_metadata (GstElementClass *klass,
const gchar *longname,
const gchar *classification,
const gchar *description,
const gchar *author);
+GST_API
void gst_element_class_set_static_metadata (GstElementClass *klass,
const gchar *longname,
const gchar *classification,
const gchar *description,
const gchar *author);
+GST_API
void gst_element_class_add_metadata (GstElementClass * klass,
const gchar * key, const gchar * value);
+GST_API
void gst_element_class_add_static_metadata (GstElementClass * klass,
const gchar * key, const gchar * value);
+GST_API
const gchar * gst_element_class_get_metadata (GstElementClass * klass,
const gchar * key);
/* element instance */
+
+GST_API
GType gst_element_get_type (void);
/* basic name and parentage stuff from GstObject */
#define gst_element_set_parent(elem,parent) gst_object_set_parent(GST_OBJECT_CAST(elem),parent)
/* clocking */
+
+GST_API
GstClock* gst_element_provide_clock (GstElement *element);
+
+GST_API
GstClock* gst_element_get_clock (GstElement *element);
+
+GST_API
gboolean gst_element_set_clock (GstElement *element, GstClock *clock);
+
+GST_API
void gst_element_set_base_time (GstElement *element, GstClockTime time);
+
+GST_API
GstClockTime gst_element_get_base_time (GstElement *element);
+
+GST_API
void gst_element_set_start_time (GstElement *element, GstClockTime time);
+
+GST_API
GstClockTime gst_element_get_start_time (GstElement *element);
/* bus */
+
+GST_API
void gst_element_set_bus (GstElement * element, GstBus * bus);
+
+GST_API
GstBus * gst_element_get_bus (GstElement * element);
/* context */
+
+GST_API
void gst_element_set_context (GstElement * element, GstContext * context);
+
+GST_API
GList * gst_element_get_contexts (GstElement * element);
+
+GST_API
GstContext * gst_element_get_context (GstElement * element, const gchar * context_type);
+
+GST_API
GstContext * gst_element_get_context_unlocked (GstElement * element, const gchar * context_type);
/* pad management */
+
+GST_API
gboolean gst_element_add_pad (GstElement *element, GstPad *pad);
+
+GST_API
gboolean gst_element_remove_pad (GstElement *element, GstPad *pad);
+
+GST_API
void gst_element_no_more_pads (GstElement *element);
+GST_API
GstPad* gst_element_get_static_pad (GstElement *element, const gchar *name);
+
+GST_API
GstPad* gst_element_get_request_pad (GstElement *element, const gchar *name);
+
+GST_API
GstPad* gst_element_request_pad (GstElement *element, GstPadTemplate *templ,
const gchar * name, const GstCaps *caps);
+GST_API
void gst_element_release_request_pad (GstElement *element, GstPad *pad);
+GST_API
GstIterator * gst_element_iterate_pads (GstElement * element);
+
+GST_API
GstIterator * gst_element_iterate_src_pads (GstElement * element);
+
+GST_API
GstIterator * gst_element_iterate_sink_pads (GstElement * element);
+/**
+ * GstElementForeachPadFunc:
+ * @element: the #GstElement
+ * @pad: a #GstPad
+ * @user_data: user data passed to the foreach function
+ *
+ * Function called for each pad when using gst_element_foreach_sink_pad(),
+ * gst_element_foreach_src_pad(), or gst_element_foreach_pad().
+ *
+ * Returns: %FALSE to stop iterating pads, %TRUE to continue
+ *
+ * Since: 1.14
+ */
+typedef gboolean (*GstElementForeachPadFunc) (GstElement * element,
+ GstPad * pad,
+ gpointer user_data);
+
+GST_API
+gboolean gst_element_foreach_sink_pad (GstElement * element,
+ GstElementForeachPadFunc func,
+ gpointer user_data);
+GST_API
+gboolean gst_element_foreach_src_pad (GstElement * element,
+ GstElementForeachPadFunc func,
+ gpointer user_data);
+GST_API
+gboolean gst_element_foreach_pad (GstElement * element,
+ GstElementForeachPadFunc func,
+ gpointer user_data);
/* event/query/format stuff */
+
+GST_API
gboolean gst_element_send_event (GstElement *element, GstEvent *event);
+
+GST_API
gboolean gst_element_seek (GstElement *element, gdouble rate,
GstFormat format, GstSeekFlags flags,
GstSeekType start_type, gint64 start,
GstSeekType stop_type, gint64 stop);
+GST_API
gboolean gst_element_query (GstElement *element, GstQuery *query);
/* messages */
+
+GST_API
gboolean gst_element_post_message (GstElement * element, GstMessage * message);
/* error handling */
/* gcc versions < 3.3 warn about NULL being passed as format to printf */
#if (!defined(__GNUC__) || (__GNUC__ < 3) || (__GNUC__ == 3 && __GNUC_MINOR__ < 3))
+GST_API
gchar * _gst_element_error_printf (const gchar *format, ...);
#else
+GST_API
gchar * _gst_element_error_printf (const gchar *format, ...) G_GNUC_PRINTF (1, 2);
#endif
+
+GST_API
void gst_element_message_full (GstElement * element, GstMessageType type,
GQuark domain, gint code, gchar * text,
gchar * debug, const gchar * file,
const gchar * function, gint line);
-
+GST_API
void gst_element_message_full_with_details (GstElement * element, GstMessageType type,
GQuark domain, gint code, gchar * text,
gchar * debug, const gchar * file,
GstStructure * structure);
/* state management */
+
+GST_API
gboolean gst_element_is_locked_state (GstElement *element);
+
+GST_API
gboolean gst_element_set_locked_state (GstElement *element, gboolean locked_state);
+
+GST_API
gboolean gst_element_sync_state_with_parent (GstElement *element);
+GST_API
GstStateChangeReturn gst_element_get_state (GstElement * element,
GstState * state,
GstState * pending,
GstClockTime timeout);
+GST_API
GstStateChangeReturn gst_element_set_state (GstElement *element, GstState state);
+GST_API
void gst_element_abort_state (GstElement * element);
+
+GST_API
GstStateChangeReturn gst_element_change_state (GstElement * element,
GstStateChange transition);
+
+GST_API
GstStateChangeReturn gst_element_continue_state (GstElement * element,
GstStateChangeReturn ret);
+GST_API
void gst_element_lost_state (GstElement * element);
+
typedef void (*GstElementCallAsyncFunc) (GstElement * element,
gpointer user_data);
-
+GST_API
void gst_element_call_async (GstElement * element,
GstElementCallAsyncFunc func, gpointer user_data,
GDestroyNotify destroy_notify);
/* factory management */
+
+GST_API
GstElementFactory* gst_element_get_factory (GstElement *element);
/* utility functions */
+
+GST_API
gulong gst_element_add_property_notify_watch (GstElement * element,
const gchar * property_name,
gboolean include_value);
-
+GST_API
gulong gst_element_add_property_deep_notify_watch (GstElement * element,
const gchar * property_name,
gboolean include_value);
-
+GST_API
void gst_element_remove_property_notify_watch (GstElement * element,
gulong watch_id);
+GST_API
+GstPadTemplate* gst_element_get_pad_template (GstElement *element, const gchar *name);
+
+GST_API
+GList* gst_element_get_pad_template_list (GstElement *element);
+GST_API
+const gchar * gst_element_get_metadata (GstElement * element, const gchar * key);
+
#ifdef G_DEFINE_AUTOPTR_CLEANUP_FUNC
G_DEFINE_AUTOPTR_CLEANUP_FUNC(GstElement, gst_object_unref)
#endif
projects / platform / upstream / gstreamer.git / blobdiff