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gstreamer/docs/random/porting-to-1.0.txt
luz.paz 4a402c1c7d Fix typos in comments and docs 
Found via `codespell`

https://bugzilla.gnome.org/show_bug.cgi?id=795610
2018-05-01 11:18:03 +01:00

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GStreamer 0.10 to 1.0 porting guide
-----------------------------------
PREFACE
* All deprecated methods were removed. Recompile against 0.10 with
DISABLE_DEPRECATED and fix issues before attempting to port to 1.0.
* API changes are usually easy to spot, because the compiler will
generate a warning, at least if number of arguments or types differ
* Other changes are a bit more subtle. See checklist at the bottom
for some "soft" changes which the compiler will not warn about.
* python developers may find https://wiki.ubuntu.com/Novacut/GStreamer1.0
useful
* application developers may first want to have a look at the list of changes
affecting applications in the Application Development Manual:
http://gstreamer.freedesktop.org/data/doc/gstreamer/head/manual/html/chapter-porting-1.0.html
CHANGES
* GST_BOILERPLATE is gone, use G_DEFINE_TYPE instead (note that the variable
that used to be called parent_class is then called gst_foo_bar_parent_class)
* various methods take a gsize instead of a guint when talking about memory
sizes.
* multifdsink, tcpclientsink, tcpclientsrc, tcpserversrc the protocol property
is removed, use gdppay and gdpdepay.
* Presets and plugins moved to $XDG_DATA_HOME/gstreamer-1.0/ root
directory. Registry moved to $XDG_CACHE_HOME/gstreamer-1.0/.
XDG_CACHE_HOME usually points to $HOME/.cache and XDG_DATA_HOME
usually is $HOME/.local/share/.
* GstObject:
GST_OBJECT_DISPOSING flag removed
GST_OBJECT_IS_DISPOSING removed
GST_OBJECT_FLOATING flag remove, GstObject is now GInitiallyUnowned
GST_OBJECT_IS_FLOATING removed, use g_object_is_floating()
GST_CLASS_GET_LOCK, GST_CLASS_LOCK, GST_CLASS_TRYLOCK, GST_CLASS_UNLOCK,
used to be a workaround for thread-unsafe glib < 2.8
gst_object_ref_sink() has gpointer as result to make it more like the
GObject version.
gst_object_sink() removed, use gst_object_ref_sink() instead.
gst_class_signal_connect() removed, was only used for XML
parent-set and parent-unset signals removed. Use notify:parent. Currently
still disabled because of deep notify locking issues.
* GstElement:
GstElementDetails is removed and replaced with more generic metadata.
gst_element_class_set_details_simple() -> gst_element_class_set_metadata()
gst_element_class_set_documentation_uri -> gst_element_class_add_metadata
gst_element_class_set_icon_name -> gst_element_class_add_metadata
also gst_element_class_get_metadata()
gst_element_factory_get_longname -> gst_element_factory_get_metadata
gst_element_factory_get_klass -> gst_element_factory_get_metadata
gst_element_factory_get_description -> gst_element_factory_get_metadata
gst_element_factory_get_author -> gst_element_factory_get_metadata
gst_element_factory_get_documentation_uri -> gst_element_factory_get_metadata
gst_element_factory_get_icon_name -> gst_element_factory_get_metadata
gstelementmetadata.h contains the keys for all standard metadata.
gst_element_factory_can_{src,sink}_caps() => gst_element_factory_can_{src,sink}_{any,all}_caps()
Element metadata and pad templates are inherited from parent classes and
should be added in class_init instead of base_init.
gst_element_class_add_pad_template() takes ownership of the template
gst_element_class_add_static_pad_template (element_class, &src_template)
=> gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&src_template));
Elements that change the duration must post DURATION messages on the
bus when the duration changes in PAUSED or PLAYING.
gst_element_lost_state_full() -> gst_element_lost_state()
gst_element_lost_state() -> gst_element_lost_state(, TRUE)
request_new_pad_full() -> request_new_pad()
gst_element_found_tags() and gst_element_found_tags_for_pad() are gone, just
push the tag event.
* GstPad:
gst_pad_get_caps() was replaced by gst_pad_query_caps(), it
does not return writable caps anymore and an explicit
gst_caps_make_writable() needs to be performed. This was the functionality
of gst_pad_get_caps_reffed(), which is removed now.
A similar change was done for gst_pad_peer_get_caps() and
gst_pad_peer_get_caps_reffed()
gst_pad_set_bufferalloc_function(), gst_pad_alloc_buffer() and
gst_pad_alloc_buffer_and_set_caps() are removed. Use the ALLOCATION query
now when negotiating formats to obtain a reference to a bufferpool object
that can be used to allocate buffers using gst_buffer_pool_acquire_buffer().
gst_pad_set_setcaps_function() => GST_EVENT_CAPS in event handler
gst_pad_set_getcaps_function() => GST_QUERY_CAPS in query handler
gst_pad_set_acceptcaps_function() => GST_QUERY_ACCEPT_CAPS in query handler
removed sched_private, it should not be used, use g_object_set_qdata() or
use element_private.
Removed GST_PAD_CAPS() use gst_pad_get_current_caps() to get a handle to the
currently configured caps.
gst_pad_get_pad_template_caps() and gst_pad_get_pad_template()
return a new reference of the caps or template now and the return
value needs to be unreffed after usage.
gst_pad_set_caps() now pushes a CAPS event for backward compatibility.
Consider sending the CAPS event yourself. It is not possible anymore to set
NULL caps.
gst_pad_set_checkgetrange_function() and gst_pad_check_pull_range() are
gone, use the SCHEDULING query now.
gst_pad_set_blocked(), gst_pad_set_blocked_async(),
gst_pad_set_blocked_async_full() are removed, use the gst_pad_add_probe()
method with the GST_PAD_PROBE_TYPE_BLOCK to get the same result as the async
blocking version. There is no more sync version of blocking, this is in
general dangerous and can be implemented using the callbacks if needed.
gst_pad_add_data_probe(), gst_pad_add_data_probe_full(),
gst_pad_remove_data_probe(), gst_pad_add_event_probe(),
gst_pad_add_event_probe_full(), gst_pad_remove_event_probe(),
gst_pad_add_buffer_probe(), gst_pad_add_buffer_probe_full(),
gst_pad_remove_buffer_probe() are removed. Use gst_pad_add_probe() and
gst_pad_remove_probe() for equivalent functionality.
The have-data signal was removed from pads, it was never supposed to be used
without calling the _add_.*_probe() methods.
The request-link signal was removed. It was never used.
gst_pad_get_negotiated_caps() -> gst_pad_get_current_caps()
GST_FLOW_UNEXPECTED -> GST_FLOW_EOS
GST_FLOW_WRONG_STATE -> GST_FLOW_FLUSHING
GstActivateMode -> GstPadMode, GST_ACTIVATE_* -> GST_PAD_MODE_*
gst_pad_activate_{pull,push}() -> gst_pad_activate_mode()
The GstPadAcceptCapsFunction was removed and replaced with a
GST_QUERY_ACCEPT_CAPS query.
The GstPadFixateCapsFunction was removed. It has no replacement, you can
simply do the fixation in the element or use a vmethod from the base class
if appropriate.
The GstPadGetCapsFunction was removed and replaced with a GST_QUERY_CAPS
query. The query takes a GstCaps* parameter to inform the other side about
the possible caps and preferences.
gst_pad_proxy_getcaps() -> gst_pad_proxy_query_caps()
gst_pad_get_caps() -> gst_pad_query_caps()
gst_pad_peer_get_caps() -> gst_pad_peer_query_caps()
gst_pad_accept_caps() -> gst_pad_query_accept_caps()
gst_pad_peer_accept_caps() -> gst_pad_peer_query_accept_caps()
gst_pad_query_peer_*() -> gst_pad_peer_query_*()
GstPadFlags: GST_PAD_* -> GST_PAD_FLAG_*
* GstPadTemplate
gst_pad_template_get_caps() returns a new reference of the caps
and the return value needs to be unreffed after usage.
gst_pad_template_new() does not take ownership of the caps anymore.
GstPadTemplate is now created with a floating ref and
gst_element_class_add_pad_template() takes ownership of this floating ref.
GstPadTemplate instances are considered immutable and must not be
changed.
* GstMiniObject
A miniobject is now a simple refcounted structure holding the information
common to buffers, events, messages, queries and caps.
There is no more GST_TYPE_MINIOBJECT as the type for subclasses.
G_TYPE_BOXED can be used as the type of all GstMiniObject based types such
as buffers, events, messages, caps, etc. Signals, for example, would use the
boxed type if the argument include GstMiniObject derived types.
gst_mini_object_new() is removed. You would allocate memory with the
methods specific for the derived type.
GstParamSpecMiniObject is removed, use boxed param spec now with the GType
of the specific GstMiniObject derived type. Also
gst_param_spec_mini_object().
gst_param_spec_mini_object() -> g_param_spec_boxed()
The specific gst_value_*_mini_object() methods are removed, used the generic
boxed methods instead.
gst_value_set_mini_object() -> g_value_set_boxed()
gst_value_take_mini_object() -> g_value_take_boxed()
gst_value_take_get_object() -> g_value_get_boxed()
gst_value_take_dup_object() -> g_value_dup_boxed()
GST_VALUE_HOLDS_MINI_OBJECT() was removed, use G_VALUE_HOLDS_BOXED() or
type-specific GST_VALUE_HOLDS_{BUFFER,CAPS,etc.}() instead.
The GST_MINI_OBJECT_READONLY flag was removed as it used to mark the
memory in buffers as READONLY. Marking memory READONLY can now be done
with the GstMemory API. Writability of miniobjects is now either done
by using the refcount or by using exclusive locking.
* GstBuffer
A GstBuffer is now a simple boxed type this means that subclassing is not
possible anymore.
To add data to the buffer you would now use gst_buffer_insert_memory() with
a GstMemory object containing the data. Multiple memory blocks can added to
a GstBuffer that can then be retrieved with gst_buffer_peek_memory().
GST_BUFFER_DATA(), GST_BUFFER_MALLOCDATA(), GST_BUFFER_FREE_FUNC() and
GST_BUFFER_SIZE() are gone, along with the fields in GstBuffer.
The most common way to access all the data in a buffer is by using
gst_buffer_map() and gst_buffer_unmap(). These calls require you to specify
the access mode required to the data and will automatically merge and return
a writable copy of the data.
GST_BUFFER_SIZE() can be replaced with gst_buffer_get_size() but if also
access to the data is required, gst_buffer_map() can return both the size
and data in one go.
The buffer must be writable (gst_buffer_is_writable()) in order to modify
the fields, metadata or buffer memory. gst_buffer_make_writable() will not
automatically make a writable copy of the memory but will instead increase
the refcount of the memory. The _map() and _peek_memory() methods will
automatically create writable copies when needed.
gst_buffer_make_metadata_writable() is gone, you can replace this safely
with gst_buffer_make_writable().
gst_buffer_copy_metadata() is gone, use gst_buffer_copy_into() instead and
mind use GST_BUFFER_COPY_METADATA instead of the former GST_BUFFER_COPY_ALL.
gst_buffer_create_sub() is gone and can be safely replaced with
gst_buffer_copy_region().
Changing the size of the buffer data can be done with gst_buffer_resize(),
which will also update the metadata fields correctly. gst_buffer_set_size()
is #defined to a special case of gst_buffer_resize() with a 0 offset.
gst_buffer_try_new_and_alloc() is replaced with gst_buffer_new_and_alloc(),
which now returns NULL when memory allocation fails.
GST_BUFFER_CAPS() is gone, caps are not set on buffers anymore but are set
on the pads where the buffer is pushed on. Likewise GST_BUFFER_COPY_CAPS is
not needed anymore. gst_buffer_get/set_caps() are gone too.
GST_BUFFER_TIMESTAMP is gone, use GST_BUFFER_PTS or GST_BUFFER_DTS instead.
Likewise GST_BUFFER_TIMESTAMP_IS_VALID() was changed to
GST_BUFFER_PTS_IS_VALID and GST_BUFFER_DTS_IS_VALID
gst_buffer_join() was renamed to gst_buffer_append() and the memory is not
directly merged but appended.
gst_buffer_merge() was removed, it is the same as gst_buffer_join() but
without taking ownership of the arguments. Caller code should ref themselves
when needed. Note that the extra refs might force slower paths in
gst_buffer_join().
gst_buffer_is_span() and gst_buffer_span() are removed, use
gst_buffer_merge() and gst_buffer_resize() for the same effect. Merging and
spanning is delayed until the buffer is mapped and in some cases no merging
of memory is needed at all when the element can deal with individual memory
chunks.
* GstBufferList
The GstBufferList object is much simplified because most of the
functionality in the groups is now part of the GstMemory in buffers.
The object is reduced to encapsulating an array of buffers that you can send
with the regular gst_pad_push_list. The iterator is not needed anymore
because you can simply use gst_buffer_list_length() and gst_buffer_list_get()
to iterate the array.
For dealing with the groups, it's now needed to add the memory blocks to
GstBuffer and use the normal buffer API to get and merge the groups.
gst_buffer_list_sized_new() -> gst_buffer_list_new_sized()
gst_buffer_list_len() -> gst_buffer_list_length()
* GstStructure
The GArray of the structure fields are moved to private part and are not
accessible from the application anymore. Use the methods to retrieve and
modify fields from the array.
gst_structure_empty_new() -> gst_structure_new_empty()
gst_structure_id_empty_new() -> gst_structure_new_id_empty()
gst_structure_id_new() -> gst_structure_new_id()
* GstEvent
Boxed types derived from GstMiniObject.
GST_EVENT_SRC is removed. Don't use this anymore.
gst_event_new_qos_full() -> gst_event_new_qos()
gst_event_parse_qos_full() -> gst_event_parse_qos()
The GstStructure is removed from the public API, use the getters to get
a handle to a GstStructure.
GST_EVENT_NEWSEGMENT -> GST_EVENT_SEGMENT
gst_event_new_new_segment () -> gst_event_new_segment() and it takes a
GstSegment structure as an argument.
gst_event_parse_new_segment() -> gst_event_parse_segment() to retrieve the
GstSegment structure from the event.
gst_event_copy_segment() to fill a GstSegment structure.
gst_event_new_flush_stop() now takes a boolean, which in most cases should
be TRUE
* GstQuery
Boxed types derived from GstMiniObject.
The GstStructure is removed from the public API, use the getters to get
a handle to a GstStructure.
gst_query_new_application() -> gst_query_new_custom()
gst_query_parse_formats_length() -> gst_query_parse_n_formats()
gst_query_parse_formats_nth() -> gst_query_parse_nth_format()
Some query utility functions no longer use an inout parameter for the
destination/query format:
- gst_pad_query_position()
- gst_pad_query_duration()
- gst_pad_query_convert()
- gst_pad_query_peer_position()
- gst_pad_query_peer_duration()
- gst_pad_query_peer_convert()
- gst_element_query_position()
- gst_element_query_duration()
- gst_element_query_convert()
gst_element_get_query_types() and gst_pad_get_query_types() with associated
functions were removed.
* GstBufferList
Is now a boxed type derived from GstMiniObject.
* GstMessage
Is now a boxed type derived from GstMiniObject
The GstStructure is removed from the public API, use the getters to get
a handle to a GstStructure.
GST_MESSAGE_DURATION -> GST_MESSAGE_DURATION_CHANGED
gst_message_parse_duration() was removed (not needed any longer, do
a duration query to query the updated duration)
* GstCaps
Is now a boxed type derived from GstMiniObject.
GST_VIDEO_CAPS_xxx -> GST_VIDEO_CAPS_MAKE(xxx)
Some caps functions now take ownership of the input argument, for
efficiency reasons (to avoid unnecessary copies to make them writable):
gst_caps_normalize (caps) => caps = gst_caps_normalize (caps)
gst_caps_do_simplify (caps) => caps = gst_caps_simplify (caps)
gst_caps_merge (caps,caps2) => caps = gst_caps_merge (caps,caps2)
gst_caps_merge_structure (caps,st) => caps = gst_caps_merge_structure (caps,st)
gst_caps_truncate (caps) => caps = gst_caps_truncate (caps)
The compiler should warn about unused return values from these functions,
which may help find the places that need to be updated.
Removed functions:
gst_caps_union() -> gst_caps_merge(): Be careful because _merge takes
ownership of the arguments.
* GstClock
gst_clock_id_wait_async_full() was renamed to gst_clock_id_wait_async() and
the old gst_clock_id_wait_async() function was removed.
* GstSegment
abs_rate was removed from the public fields, it can be trivially calculated
from the rate field.
Also segment accumulation was removed from the segment event. This means
that now the source/demuxer/parser needs to add the elapsed time of the
previous segment themselves (this must be added to segment->base). If this
is not done, looped playback won't work.
accum was renamed to base. last_stop was renamed to position.
The segment info now contains all the information needed to convert buffer
timestamps to running_time and stream_time. There is no more segment
accumulation, the GstSegment is completely self contained.
gst_segment_set_duration() and gst_segment_set_last_stop() are removed,
simply modify the structure members duration and position respectively.
gst_segment_set_newsegment() is removed, it was used to accumulate segments
and is not needed anymore, use gst_segment_copy_into() or modify the segment
values directly.
gst_segment_set_seek() -> gst_segment_do_seek(). Updates the segment values
with seek parameters.
* GstPluginFeature
GST_PLUGIN_FEATURE_NAME() was removed, use GST_OBJECT_NAME() instead.
* GstTypeFind
gst_type_find_peek() returns a const guint8 * now.
* GstTask
gst_task_create() -> gst_task_new()
* GstAudio
GstBaseAudioSink -> GstAudioBaseSink
GstBaseAudioSrc -> GstAudioBaseSrc
...
* GstAdapter
gst_adapter_peek() is removed, use gst_adapter_map() and gst_adapter_unmap()
to get access to raw data from the adapter.
Arguments changed from guint to gsize.
gst_adapter_prev_timestamp() is removed and should be replaced with
gst_adapter_prev_pts() and gst_adapter_prev_dts().
* GstBitReader, GstByteReader, GstByteWriter
gst_*_reader_new_from_buffer(), gst_*_reader_init_from_buffer() removed, get
access to the buffer data with _map() and then use the _new() functions.
gst_byte_reader_new_from_buffer() and gst_byte_reader_init_from_buffer()
removed, get access to the buffer data and then use the _new() functions.
* GstCollectPads
gst_collect_pads_read() removed, use _read_buffer() or _take_buffer() and
then use the memory API to get to the memory.
* GstBaseSrc, GstBaseTransform, GstBaseSink
GstBaseSrc::get_caps(), GstBaseTransform::transform_caps() and
GstBaseSink::get_caps() now take a filter GstCaps* parameter to
filter the caps and allow better negotiation decisions.
* GstBaseSrc
When overriding GstBaseTransform::fixate() one should chain up to the parent
implementation.
* GstBaseTransform
GstBaseTransform::transform_caps() now gets the complete caps passed
instead of getting it passed structure by structure.
GstBaseTransform::event() was renamed to sink_event(). The old function
uses the return value to determine if the event should be forwarded or not.
The new function has a default implementation that always forwards the event
and the return value is simply returned as a result from the event handler.
The semantics of the sink_event are thus the same as those for the src_event
function.
* GstImplementsInterface
has been removed. Interfaces need to be updated to either have
is_ready/usable/available() methods, or have GError arguments
to their methods so we can return an appropriate error if a
particular interface isn't supported for a particular device.
* GstIterator
uses a GValue based API now that is similar to the 0.10 API but
allows bindings to properly use GstIterator and prevents complex
return value ownership issues.
* GstNavigationInterface
Now part of the video library in gst-plugins-base, and the interfaces
library no longer exists.
* GstMixerInterface / GstTunerInterface
Removed - no replacement?
* GstXOverlay interface
Renamed to GstVideoOverlay, and now part of the video library in
gst-plugins-base, as the interfaces library no longer exists.
* GstPropertyProbe interface
Removed - no replacement in 1.0.x and 1.2.x, but since 1.4 there is
a more featureful replacement for device discovery and feature querying,
provided by GstDeviceMonitor, GstDevice, and friends. See the
"GStreamer Device Discovery and Device Probing" documentation at
http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-device-probing.html
* GstURIHandler
gst_uri_handler_get_uri() and the get_uri vfunc now return a copy of
the URI string
gst_uri_handler_set_uri() and the set_uri vfunc now take an additional
GError argument so the handler can notify the caller why it didn't
accept a particular URI.
gst_uri_handler_set_uri() now checks if the protocol of the URI passed
is one of the protocols advertised by the uri handler, so set_uri vfunc
implementations no longer need to check that as well.
* GstTagList
is now an opaque mini object instead of being typedefed to a GstStructure.
While it was previously okay (and in some cases required because of
missing taglist API) to cast a GstTagList to a GstStructure or use
gst_structure_* API on taglists, you can no longer do that. Doing so will
cause crashes.
Also, tag lists are refcounted now, and can therefore not be freely
modified any longer. Make sure to call
taglist = gst_tag_list_make_writable (taglist);
before adding, removing or changing tags in the taglist.
gst_tag_list_new() has been renamed to gst_tag_list_new_empty().
gst_tag_list_new_full*() have been renamed to gst_tag_list_new*().
gst_tag_list_free() has been replaced by gst_tag_list_unref().
GST_TAG_IMAGE, GST_TAG_PREVIEW_IMAGE, GST_TAG_ATTACHMENT: many tags that
used to be of type GstBuffer are now of type GstSample (which is basically
a struct containing a buffer alongside caps and some other info).
gst_tag_list_get_buffer() => gst_tag_list_get_sample()
gst_is_tag_list() => GST_IS_TAG_LIST ()
* GstController:
has now been merged into GstObject. It does not exists as a individual
object anymore. In addition core contains a GstControlSource base class and
the GstControlBinding. The actual control sources are in the controller
library as before. The 2nd big change is that control sources generate
a sequence of gdouble values and those are mapped to the property type and
value range by GstControlBindings.
For plugins the effect is that gst_controller_init() is gone and
gst_object_sync_values() is taking a GstObject * instead of GObject *.
For applications the effect is larger. The whole gst_controller_* API is
gone and now available in simplified form under gst_object_*. ControlSources
are now attached via GstControlBinding to properties. There are no GValue
arguments used anymore when programming control sources.
A simple way to attach a ControlSource to a property is:
gst_object_add_control_binding (object,
gst_direct_control_binding_new (object, property_name, control_source));
gst_controller_set_property_disabled ->
gst_object_set_control_binding_disabled
gst_object_get_value_arrays has been removed. Loop over the controlled
properties fetch the value array. Also GstValueArray is gone. The fields of
GstValueArray are now passed directly to gst_object_get_value_array as
arguments.
GstInterpolationControlSource has been split. There is a new
GstTimedValueControlSource baseclass and 2 sub classes:
GstInterpolationControlSource and GstTriggerControlSource. The API for setting
and getting the timestamps is in GstTimedValueControlSource.
gst_interpolation_control_source_set_interpolation_mode() has been removed.
Set the "mode" gobject property on the control-source instead. The possible
enum values have been renamed from GST_INTERPOLATE_XXX to
GST_INTERPOLATION_MODE_XXX.
* GstRegistry
gst_registry_get_default() -> gst_registry_get()
gst_default_registry_*(...) -> gst_registry_*(gst_registry_get(), ...)
* GstValue
GST_TYPE_DATE -> G_TYPE_DATE
GST_VALUE_HOLDS_DATE(value) -> G_VALUE_HOLDS(value,G_TYPE_DATE)
gst_value_set_date() -> g_value_set_boxed()
gst_value_get_date() -> g_value_get_boxed()
* GError/GstGError
GstGError -> GError
GST_TYPE_G_ERROR / gst_g_error_get_type() -> G_TYPE_ERROR
* GstVideo
GstXOverlay interface -> renamed to GstVideoOverlay, and now part of
the video library in gst-plugins-base, as the interfaces library
no longer exists.
gst_video_format_parse_caps() -> use gst_video_info_from_caps() and
then GstVideoInfo.
* GstChildProxy
gst_child_proxy_lookup() can no longer be called on GObjects that
do not implement the GstChildProxy interface. Use
g_object_class_find_property (G_OBJECT_GET_CLASS (obj), "foo")
instead for non-childproxy objects.
* "codec-data" and "streamheader" field in GstCaps (not implemented yet!)
codec-data and stream headers are no longer in GstCaps, but sent as
part of a STREAM CONFIG event (which should be sent after the initial
CAPS event if needed).
=============================================================================
Porting checklist - "soft" API changes
=============================================================================
* the "ffmpegcolorspace" element has been replaced by "videoconvert"
* "playbin2" has been renamed to "playbin", with similar API
* "decodebin2" has been renamed to "decodebin", with similar API. Note
that there is no longer a "new-decoded-pad" signal, just use GstElement's
"pad-added" signal instead (but don't forget to remove the 'gboolean last'
argument from your old signal callback function signature).
* the names of some "formatted" pad templates has been changed from e.g.
"src%d" to "src%u" or "src_%u" or similar, since we don't want to see
negative numbers in pad names. This mostly affects applications that
create request pads from elements.
* some elements that used to have a single dynamic source pad have a
static source pad now. Example: wavparse, id3demux, iceydemux, apedemux.
(This does not affect applications using decodebin or playbin).
* the name of the GstXOverlay "prepare-xwindow-id" message has changed
to "prepare-window-handle" (and GstXOverlay has been renamed to
GstVideoOverlay). Code that checks for the string directly should be
changed to use gst_is_video_overlay_prepare_window_handle_message(message)
instead.
* playbin now proxies the GstVideoOverlay (former GstXOverlay) interface,
so most applications can just remove the sync bus handler where they
would set the window ID, and instead just set the window ID on playbin
from the application thread before starting playback.
* playbin also proxies the GstColorBalance and GstNavigation interfaces,
so applications that use this don't need to go fishing for elements
that may implement those any more, but can just use them unconditionally.
* level sendy the per channel values as a GValueArray instead of a GstValueList
see gst-plugins-good/test/examples/level/level-example.c
* media type / caps changes:
audio/x-raw-int -> audio/x-raw
audio/x-raw-float -> audio/x-raw
video/x-raw-rgb -> video/x-raw
video/x-raw-yuv -> video/x-raw
video/x-raw-bayer -> video/x-bayer
video/x-dvd-subpicture -> subpicture/x-dvd
application/ogg -> audio/ogg or video/ogg (or application/ogg)
video/x-matroska -> audio/x-matroska or video/x-matroska or video/x-matroska-3d
video/webm -> audio/webm or video/webm
text/plain -> text/x-raw, format=utf8
text/x-pango-markup -> text/x-raw, format=pango-markup
* element name changes/replacements:
playbin2 -> playbin
decodebin2 -> decodebin
camerabin2 -> camerabin
ffmpegcolorspace -> videoconvert
mp3parse -> mpegaudioparse
legacyh264parse -> h264parse (note: properties gone, use downstream caps)
lame -> lamemp3enc
jp2k{enc,dec} -> openjpeg{enc,dec}
ffenc_* -> avenc_*
ffdec_* -> avdec_*
ffdemux_* -> avdemux_*
ffmux_* -> avmux_*
* property type changes (very nasty for code using the C g_object_set/get API)
- playbin2::connection-speed:
changed from a plain unsigned integer to an unsigned 64-bit integer
* property default value changes
- souphttpsrc now by default asks the server to send icecast metadata
if available (from internet radio streams usually). This has
implications for hand-rolled pipelines, which may require an icydemux
element now to parse that metadata (without that the data might be
garbled). Since 1.0.7 the "iradio-mode" property has been re-added
to allow users to switch off the default behaviour of requesting
icecast metadata.
- fakesink, identity and fakesrc's "silent" property default value
changed from FALSE to TRUE. This means that "gst-launch-1.0 -v" will
not show messages from any of these elements unless you explicitly
request them with "silent=false". This change was made for efficiency
reasons.
* decoders now require parsers in front of them
- in 1.0 many decoders require parsers in front of them in many
situation. This is to simplify decoders and move a lot of the
"intelligence" into the parser. This makes it easier to write
decoders and minimises behavioural differences between different
decoders (both for the same format and different formats). So e.g.
filesrc ! flacdec ! audioconvert ! pulsesink
now becomes
filesrc ! flacparse ! flacdec ! audioconvert ! pulsesink
but better just use
filesrc ! decodebin ! audioconvert ! pulsesink
or even
playbin uri=file:///path/to/foo.flac audio-sink=pulsesink
* non-time-based sources do not provide presentation timestamps anymore
- Sources based on BYTEs instead of TIME (like filesrc or souphttpsrc)
do not provide PTS anymore. In the 0.10 API they provided a PTS with
value 0 for the first buffer. This was needed for legacy operation but
has been removed in the 1.0 API. These sources will usually still put
a 0 DTS (decoding timestamp) on the first buffer even if PTS is unset.
=============================================================================
Troubleshooting
=============================================================================
* GLib-GObject-WARNING **: cannot register existing type `GstObject'
If you get this warning, this usually means your plugin or application
is linked against both libgstreamer-1.0.so and libgstreamer-0.10.so.
Make sure you have changed all -0.10 references in your configure.ac,
pkg-config invocations or Makefile.am/Makefile to -1.0.
While both versions can co-exist without problems on the same system, it
is not possible to use both versions at the same time in a single running
process. In most cases this would also not be the desired behaviour.
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