forked from mirrors/gstreamer-rs
500 lines
15 KiB
Markdown
500 lines
15 KiB
Markdown
<!-- file * -->
|
|
<!-- struct Discoverer -->
|
|
The `Discoverer` is a utility object which allows to get as much
|
|
information as possible from one or many URIs.
|
|
|
|
It provides two APIs, allowing usage in blocking or non-blocking mode.
|
|
|
|
The blocking mode just requires calling `Discoverer::discover_uri`
|
|
with the URI one wishes to discover.
|
|
|
|
The non-blocking mode requires a running `glib::MainLoop` iterating a
|
|
`glib::MainContext`, where one connects to the various signals, appends the
|
|
URIs to be processed (through `Discoverer::discover_uri_async`) and then
|
|
asks for the discovery to begin (through `Discoverer::start`).
|
|
By default this will use the GLib default main context unless you have
|
|
set a custom context using `glib::MainContext::push_thread_default`.
|
|
|
|
All the information is returned in a `DiscovererInfo` structure.
|
|
|
|
# Implements
|
|
|
|
[`glib::object::ObjectExt`](../glib/object/trait.ObjectExt.html)
|
|
<!-- impl Discoverer::fn new -->
|
|
Creates a new `Discoverer` with the provided timeout.
|
|
## `timeout`
|
|
timeout per file, in nanoseconds. Allowed are values between
|
|
one second (`GST_SECOND`) and one hour (3600 * `GST_SECOND`)
|
|
|
|
# Returns
|
|
|
|
The new `Discoverer`.
|
|
If an error occurred when creating the discoverer, `err` will be set
|
|
accordingly and `None` will be returned. If `err` is set, the caller must
|
|
free it when no longer needed using `glib::Error::free`.
|
|
<!-- impl Discoverer::fn discover_uri -->
|
|
Synchronously discovers the given `uri`.
|
|
|
|
A copy of `uri` will be made internally, so the caller can safely `g_free`
|
|
afterwards.
|
|
## `uri`
|
|
The URI to run on.
|
|
|
|
# Returns
|
|
|
|
the result of the scanning. Can be `None` if an
|
|
error occurred.
|
|
<!-- impl Discoverer::fn discover_uri_async -->
|
|
Appends the given `uri` to the list of URIs to discoverer. The actual
|
|
discovery of the `uri` will only take place if `Discoverer::start` has
|
|
been called.
|
|
|
|
A copy of `uri` will be made internally, so the caller can safely `g_free`
|
|
afterwards.
|
|
## `uri`
|
|
the URI to add.
|
|
|
|
# Returns
|
|
|
|
`true` if the `uri` was successfully appended to the list of pending
|
|
uris, else `false`
|
|
<!-- impl Discoverer::fn start -->
|
|
Allow asynchronous discovering of URIs to take place.
|
|
A `glib::MainLoop` must be available for `Discoverer` to properly work in
|
|
asynchronous mode.
|
|
<!-- impl Discoverer::fn stop -->
|
|
Stop the discovery of any pending URIs and clears the list of
|
|
pending URIS (if any).
|
|
<!-- trait DiscovererExt::fn connect_discovered -->
|
|
Will be emitted in async mode when all information on a URI could be
|
|
discovered, or an error occurred.
|
|
|
|
When an error occurs, `info` might still contain some partial information,
|
|
depending on the circumstances of the error.
|
|
## `info`
|
|
the results `DiscovererInfo`
|
|
## `error`
|
|
`glib::Error`, which will be non-NULL
|
|
if an error occurred during
|
|
discovery. You must not free
|
|
this `glib::Error`, it will be freed by
|
|
the discoverer.
|
|
<!-- trait DiscovererExt::fn connect_finished -->
|
|
Will be emitted in async mode when all pending URIs have been processed.
|
|
<!-- trait DiscovererExt::fn connect_source_setup -->
|
|
This signal is emitted after the source element has been created for, so
|
|
the URI being discovered, so it can be configured by setting additional
|
|
properties (e.g. set a proxy server for an http source, or set the device
|
|
and read speed for an audio cd source).
|
|
|
|
This signal is usually emitted from the context of a GStreamer streaming
|
|
thread.
|
|
## `source`
|
|
source element
|
|
<!-- trait DiscovererExt::fn connect_starting -->
|
|
Will be emitted when the discover starts analyzing the pending URIs
|
|
<!-- trait DiscovererExt::fn get_property_timeout -->
|
|
The duration (in nanoseconds) after which the discovery of an individual
|
|
URI will timeout.
|
|
|
|
If the discovery of a URI times out, the `DiscovererResult::Timeout` will be
|
|
set on the result flags.
|
|
<!-- trait DiscovererExt::fn set_property_timeout -->
|
|
The duration (in nanoseconds) after which the discovery of an individual
|
|
URI will timeout.
|
|
|
|
If the discovery of a URI times out, the `DiscovererResult::Timeout` will be
|
|
set on the result flags.
|
|
<!-- struct DiscovererAudioInfo -->
|
|
`DiscovererStreamInfo` specific to audio streams.
|
|
|
|
# Implements
|
|
|
|
[`DiscovererStreamInfoExt`](trait.DiscovererStreamInfoExt.html), [`glib::object::ObjectExt`](../glib/object/trait.ObjectExt.html)
|
|
<!-- impl DiscovererAudioInfo::fn get_bitrate -->
|
|
|
|
# Returns
|
|
|
|
the average or nominal bitrate of the stream in bits/second.
|
|
<!-- impl DiscovererAudioInfo::fn get_channel_mask -->
|
|
|
|
Feature: `v1_14`
|
|
|
|
|
|
# Returns
|
|
|
|
the channel-mask of the stream, refer to
|
|
`gst_audio_channel_positions_from_mask` for more
|
|
information.
|
|
<!-- impl DiscovererAudioInfo::fn get_channels -->
|
|
|
|
# Returns
|
|
|
|
the number of channels in the stream.
|
|
<!-- impl DiscovererAudioInfo::fn get_depth -->
|
|
|
|
# Returns
|
|
|
|
the number of bits used per sample in each channel.
|
|
<!-- impl DiscovererAudioInfo::fn get_language -->
|
|
|
|
# Returns
|
|
|
|
the language of the stream, or NULL if unknown.
|
|
<!-- impl DiscovererAudioInfo::fn get_max_bitrate -->
|
|
|
|
# Returns
|
|
|
|
the maximum bitrate of the stream in bits/second.
|
|
<!-- impl DiscovererAudioInfo::fn get_sample_rate -->
|
|
|
|
# Returns
|
|
|
|
the sample rate of the stream in Hertz.
|
|
<!-- struct DiscovererContainerInfo -->
|
|
`DiscovererStreamInfo` specific to container streams.
|
|
|
|
# Implements
|
|
|
|
[`DiscovererStreamInfoExt`](trait.DiscovererStreamInfoExt.html), [`glib::object::ObjectExt`](../glib/object/trait.ObjectExt.html)
|
|
<!-- impl DiscovererContainerInfo::fn get_streams -->
|
|
|
|
# Returns
|
|
|
|
the list of
|
|
`DiscovererStreamInfo` this container stream offers.
|
|
Free with `DiscovererStreamInfo::list_free` after usage.
|
|
<!-- struct DiscovererInfo -->
|
|
Structure containing the information of a URI analyzed by `Discoverer`.
|
|
|
|
# Implements
|
|
|
|
[`DiscovererInfoExt`](trait.DiscovererInfoExt.html), [`glib::object::ObjectExt`](../glib/object/trait.ObjectExt.html)
|
|
<!-- trait DiscovererInfoExt -->
|
|
Trait containing all `DiscovererInfo` methods.
|
|
|
|
# Implementors
|
|
|
|
[`DiscovererInfo`](struct.DiscovererInfo.html)
|
|
<!-- impl DiscovererInfo::fn from_variant -->
|
|
Parses a `glib::Variant` as produced by `DiscovererInfoExt::to_variant`
|
|
back to a `DiscovererInfo`.
|
|
## `variant`
|
|
A `glib::Variant` to deserialize into a `DiscovererInfo`.
|
|
|
|
# Returns
|
|
|
|
A newly-allocated `DiscovererInfo`.
|
|
<!-- trait DiscovererInfoExt::fn copy -->
|
|
|
|
# Returns
|
|
|
|
A copy of the `DiscovererInfo`
|
|
<!-- trait DiscovererInfoExt::fn get_audio_streams -->
|
|
Finds all the `DiscovererAudioInfo` contained in `self`
|
|
|
|
# Returns
|
|
|
|
A `glib::List` of
|
|
matching `DiscovererStreamInfo`. The caller should free it with
|
|
`DiscovererStreamInfo::list_free`.
|
|
<!-- trait DiscovererInfoExt::fn get_container_streams -->
|
|
Finds all the `DiscovererContainerInfo` contained in `self`
|
|
|
|
# Returns
|
|
|
|
A `glib::List` of
|
|
matching `DiscovererStreamInfo`. The caller should free it with
|
|
`DiscovererStreamInfo::list_free`.
|
|
<!-- trait DiscovererInfoExt::fn get_duration -->
|
|
|
|
# Returns
|
|
|
|
the duration of the URI in `gst::ClockTime` (nanoseconds).
|
|
<!-- trait DiscovererInfoExt::fn get_live -->
|
|
|
|
Feature: `v1_14`
|
|
|
|
|
|
# Returns
|
|
|
|
whether the URI is live.
|
|
<!-- trait DiscovererInfoExt::fn get_misc -->
|
|
|
|
# Deprecated
|
|
|
|
This functions is deprecated since version 1.4, use
|
|
`DiscovererInfoExt::get_missing_elements_installer_details`
|
|
|
|
# Returns
|
|
|
|
Miscellaneous information stored as a `gst::Structure`
|
|
(for example: information about missing plugins). If you wish to use the
|
|
`gst::Structure` after the life-time of `self`, you will need to copy it.
|
|
<!-- trait DiscovererInfoExt::fn get_missing_elements_installer_details -->
|
|
Get the installer details for missing elements
|
|
|
|
# Returns
|
|
|
|
An array of strings
|
|
containing informations about how to install the various missing elements
|
|
for `self` to be usable. If you wish to use the strings after the life-time
|
|
of `self`, you will need to copy them.
|
|
<!-- trait DiscovererInfoExt::fn get_result -->
|
|
|
|
# Returns
|
|
|
|
the result of the discovery as a `DiscovererResult`.
|
|
<!-- trait DiscovererInfoExt::fn get_seekable -->
|
|
|
|
# Returns
|
|
|
|
the whether the URI is seekable.
|
|
<!-- trait DiscovererInfoExt::fn get_stream_info -->
|
|
|
|
# Returns
|
|
|
|
the structure (or topology) of the URI as a
|
|
`DiscovererStreamInfo`.
|
|
This structure can be traversed to see the original hierarchy. Unref with
|
|
`gst_discoverer_stream_info_unref` after usage.
|
|
<!-- trait DiscovererInfoExt::fn get_stream_list -->
|
|
|
|
# Returns
|
|
|
|
the list of
|
|
all streams contained in the `info`. Free after usage
|
|
with `DiscovererStreamInfo::list_free`.
|
|
<!-- trait DiscovererInfoExt::fn get_streams -->
|
|
Finds the `DiscovererStreamInfo` contained in `self` that match the
|
|
given `streamtype`.
|
|
## `streamtype`
|
|
a `glib::Type` derived from `DiscovererStreamInfo`
|
|
|
|
# Returns
|
|
|
|
A `glib::List` of
|
|
matching `DiscovererStreamInfo`. The caller should free it with
|
|
`DiscovererStreamInfo::list_free`.
|
|
<!-- trait DiscovererInfoExt::fn get_subtitle_streams -->
|
|
Finds all the `DiscovererSubtitleInfo` contained in `self`
|
|
|
|
# Returns
|
|
|
|
A `glib::List` of
|
|
matching `DiscovererStreamInfo`. The caller should free it with
|
|
`DiscovererStreamInfo::list_free`.
|
|
<!-- trait DiscovererInfoExt::fn get_tags -->
|
|
|
|
# Returns
|
|
|
|
all tags contained in the URI. If you wish to use
|
|
the tags after the life-time of `self`, you will need to copy them.
|
|
<!-- trait DiscovererInfoExt::fn get_toc -->
|
|
|
|
# Returns
|
|
|
|
TOC contained in the URI. If you wish to use
|
|
the TOC after the life-time of `self`, you will need to copy it.
|
|
<!-- trait DiscovererInfoExt::fn get_uri -->
|
|
|
|
# Returns
|
|
|
|
the URI to which this information corresponds to.
|
|
Copy it if you wish to use it after the life-time of `self`.
|
|
<!-- trait DiscovererInfoExt::fn get_video_streams -->
|
|
Finds all the `DiscovererVideoInfo` contained in `self`
|
|
|
|
# Returns
|
|
|
|
A `glib::List` of
|
|
matching `DiscovererStreamInfo`. The caller should free it with
|
|
`DiscovererStreamInfo::list_free`.
|
|
<!-- trait DiscovererInfoExt::fn to_variant -->
|
|
Serializes `self` to a `glib::Variant` that can be parsed again
|
|
through `DiscovererInfo::from_variant`.
|
|
|
|
Note that any `gst::Toc` (s) that might have been discovered will not be serialized
|
|
for now.
|
|
## `flags`
|
|
A combination of `DiscovererSerializeFlags` to specify
|
|
what needs to be serialized.
|
|
|
|
# Returns
|
|
|
|
A newly-allocated `glib::Variant` representing `self`.
|
|
<!-- enum DiscovererResult -->
|
|
Result values for the discovery process.
|
|
<!-- enum DiscovererResult::variant Ok -->
|
|
The discovery was successful
|
|
<!-- enum DiscovererResult::variant UriInvalid -->
|
|
the URI is invalid
|
|
<!-- enum DiscovererResult::variant Error -->
|
|
an error happened and the GError is set
|
|
<!-- enum DiscovererResult::variant Timeout -->
|
|
the discovery timed-out
|
|
<!-- enum DiscovererResult::variant Busy -->
|
|
the discoverer was already discovering a file
|
|
<!-- enum DiscovererResult::variant MissingPlugins -->
|
|
Some plugins are missing for full discovery
|
|
<!-- struct DiscovererStreamInfo -->
|
|
Base structure for information concerning a media stream. Depending on the
|
|
stream type, one can find more media-specific information in
|
|
`DiscovererAudioInfo`, `DiscovererVideoInfo`, and
|
|
`DiscovererContainerInfo`.
|
|
|
|
The `DiscovererStreamInfo` represents the topology of the stream. Siblings
|
|
can be iterated over with `DiscovererStreamInfoExt::get_next` and
|
|
`DiscovererStreamInfoExt::get_previous`. Children (sub-streams) of a
|
|
stream can be accessed using the `DiscovererContainerInfo` API.
|
|
|
|
As a simple example, if you run `Discoverer` on an AVI file with one audio
|
|
and one video stream, you will get a `DiscovererContainerInfo`
|
|
corresponding to the AVI container, which in turn will have a
|
|
`DiscovererAudioInfo` sub-stream and a `DiscovererVideoInfo` sub-stream
|
|
for the audio and video streams respectively.
|
|
|
|
# Implements
|
|
|
|
[`DiscovererStreamInfoExt`](trait.DiscovererStreamInfoExt.html), [`glib::object::ObjectExt`](../glib/object/trait.ObjectExt.html)
|
|
<!-- trait DiscovererStreamInfoExt -->
|
|
Trait containing all `DiscovererStreamInfo` methods.
|
|
|
|
# Implementors
|
|
|
|
[`DiscovererAudioInfo`](struct.DiscovererAudioInfo.html), [`DiscovererContainerInfo`](struct.DiscovererContainerInfo.html), [`DiscovererStreamInfo`](struct.DiscovererStreamInfo.html), [`DiscovererSubtitleInfo`](struct.DiscovererSubtitleInfo.html), [`DiscovererVideoInfo`](struct.DiscovererVideoInfo.html)
|
|
<!-- impl DiscovererStreamInfo::fn list_free -->
|
|
Decrements the reference count of all contained `DiscovererStreamInfo`
|
|
and fress the `glib::List`.
|
|
## `infos`
|
|
a `glib::List` of `DiscovererStreamInfo`
|
|
<!-- trait DiscovererStreamInfoExt::fn get_caps -->
|
|
|
|
# Returns
|
|
|
|
the `gst::Caps` of the stream. Unref with
|
|
`gst_caps_unref` after usage.
|
|
<!-- trait DiscovererStreamInfoExt::fn get_misc -->
|
|
|
|
# Deprecated
|
|
|
|
This functions is deprecated since version 1.4, use
|
|
`DiscovererInfoExt::get_missing_elements_installer_details`
|
|
|
|
# Returns
|
|
|
|
additional information regarding the stream (for
|
|
example codec version, profile, etc..). If you wish to use the `gst::Structure`
|
|
after the life-time of `self` you will need to copy it.
|
|
<!-- trait DiscovererStreamInfoExt::fn get_next -->
|
|
|
|
# Returns
|
|
|
|
the next `DiscovererStreamInfo` in a chain. `None`
|
|
for final streams.
|
|
Unref with `gst_discoverer_stream_info_unref` after usage.
|
|
<!-- trait DiscovererStreamInfoExt::fn get_previous -->
|
|
|
|
# Returns
|
|
|
|
the previous `DiscovererStreamInfo` in a chain.
|
|
`None` for starting points. Unref with `gst_discoverer_stream_info_unref`
|
|
after usage.
|
|
<!-- trait DiscovererStreamInfoExt::fn get_stream_id -->
|
|
|
|
# Returns
|
|
|
|
the stream ID of this stream. If you wish to
|
|
use the stream ID after the life-time of `self` you will need to copy it.
|
|
<!-- trait DiscovererStreamInfoExt::fn get_stream_type_nick -->
|
|
|
|
# Returns
|
|
|
|
a human readable name for the stream type of the given `self` (ex : "audio",
|
|
"container",...).
|
|
<!-- trait DiscovererStreamInfoExt::fn get_tags -->
|
|
|
|
# Returns
|
|
|
|
the tags contained in this stream. If you wish to
|
|
use the tags after the life-time of `self` you will need to copy them.
|
|
<!-- trait DiscovererStreamInfoExt::fn get_toc -->
|
|
|
|
# Returns
|
|
|
|
the TOC contained in this stream. If you wish to
|
|
use the TOC after the life-time of `self` you will need to copy it.
|
|
<!-- struct DiscovererSubtitleInfo -->
|
|
`DiscovererStreamInfo` specific to subtitle streams (this includes text and
|
|
image based ones).
|
|
|
|
# Implements
|
|
|
|
[`DiscovererStreamInfoExt`](trait.DiscovererStreamInfoExt.html), [`glib::object::ObjectExt`](../glib/object/trait.ObjectExt.html)
|
|
<!-- impl DiscovererSubtitleInfo::fn get_language -->
|
|
|
|
# Returns
|
|
|
|
the language of the stream, or NULL if unknown.
|
|
<!-- struct DiscovererVideoInfo -->
|
|
`DiscovererStreamInfo` specific to video streams (this includes images).
|
|
|
|
# Implements
|
|
|
|
[`DiscovererStreamInfoExt`](trait.DiscovererStreamInfoExt.html), [`glib::object::ObjectExt`](../glib/object/trait.ObjectExt.html)
|
|
<!-- impl DiscovererVideoInfo::fn get_bitrate -->
|
|
|
|
# Returns
|
|
|
|
the average or nominal bitrate of the video stream in bits/second.
|
|
<!-- impl DiscovererVideoInfo::fn get_depth -->
|
|
|
|
# Returns
|
|
|
|
the depth in bits of the video stream.
|
|
<!-- impl DiscovererVideoInfo::fn get_framerate_denom -->
|
|
|
|
# Returns
|
|
|
|
the framerate of the video stream (denominator).
|
|
<!-- impl DiscovererVideoInfo::fn get_framerate_num -->
|
|
|
|
# Returns
|
|
|
|
the framerate of the video stream (numerator).
|
|
<!-- impl DiscovererVideoInfo::fn get_height -->
|
|
|
|
# Returns
|
|
|
|
the height of the video stream in pixels.
|
|
<!-- impl DiscovererVideoInfo::fn get_max_bitrate -->
|
|
|
|
# Returns
|
|
|
|
the maximum bitrate of the video stream in bits/second.
|
|
<!-- impl DiscovererVideoInfo::fn get_par_denom -->
|
|
|
|
# Returns
|
|
|
|
the Pixel Aspect Ratio (PAR) of the video stream (denominator).
|
|
<!-- impl DiscovererVideoInfo::fn get_par_num -->
|
|
|
|
# Returns
|
|
|
|
the Pixel Aspect Ratio (PAR) of the video stream (numerator).
|
|
<!-- impl DiscovererVideoInfo::fn get_width -->
|
|
|
|
# Returns
|
|
|
|
the width of the video stream in pixels.
|
|
<!-- impl DiscovererVideoInfo::fn is_image -->
|
|
|
|
# Returns
|
|
|
|
`true` if the video stream corresponds to an image (i.e. only contains
|
|
one frame).
|
|
<!-- impl DiscovererVideoInfo::fn is_interlaced -->
|
|
|
|
# Returns
|
|
|
|
`true` if the stream is interlaced, else `false`.
|