forked from mirrors/gstreamer-rs
338 lines
12 KiB
Markdown
338 lines
12 KiB
Markdown
<!-- file * -->
|
|
<!-- enum AudioChannelPosition -->
|
|
Audio channel positions.
|
|
|
|
These are the channels defined in SMPTE 2036-2-2008
|
|
Table 1 for 22.2 audio systems with the Surround and Wide channels from
|
|
DTS Coherent Acoustics (v.1.3.1) and 10.2 and 7.1 layouts. In the caps the
|
|
actual channel layout is expressed with a channel count and a channel mask,
|
|
which describes the existing channels. The positions in the bit mask correspond
|
|
to the enum values.
|
|
For negotiation it is allowed to have more bits set in the channel mask than
|
|
the number of channels to specify the allowed channel positions but this is
|
|
not allowed in negotiated caps. It is not allowed in any situation other
|
|
than the one mentioned below to have less bits set in the channel mask than
|
|
the number of channels.
|
|
|
|
`AudioChannelPosition::Mono` can only be used with a single mono channel that
|
|
has no direction information and would be mixed into all directional channels.
|
|
This is expressed in caps by having a single channel and no channel mask.
|
|
|
|
`AudioChannelPosition::None` can only be used if all channels have this position.
|
|
This is expressed in caps by having a channel mask with no bits set.
|
|
|
|
As another special case it is allowed to have two channels without a channel mask.
|
|
This implicitely means that this is a stereo stream with a front left and front right
|
|
channel.
|
|
<!-- enum AudioChannelPosition::variant None -->
|
|
used for position-less channels, e.g.
|
|
from a sound card that records 1024 channels; mutually exclusive with
|
|
any other channel position
|
|
<!-- enum AudioChannelPosition::variant Mono -->
|
|
Mono without direction;
|
|
can only be used with 1 channel
|
|
<!-- enum AudioChannelPosition::variant Invalid -->
|
|
invalid position
|
|
<!-- enum AudioChannelPosition::variant FrontLeft -->
|
|
Front left
|
|
<!-- enum AudioChannelPosition::variant FrontRight -->
|
|
Front right
|
|
<!-- enum AudioChannelPosition::variant FrontCenter -->
|
|
Front center
|
|
<!-- enum AudioChannelPosition::variant Lfe1 -->
|
|
Low-frequency effects 1 (subwoofer)
|
|
<!-- enum AudioChannelPosition::variant RearLeft -->
|
|
Rear left
|
|
<!-- enum AudioChannelPosition::variant RearRight -->
|
|
Rear right
|
|
<!-- enum AudioChannelPosition::variant FrontLeftOfCenter -->
|
|
Front left of center
|
|
<!-- enum AudioChannelPosition::variant FrontRightOfCenter -->
|
|
Front right of center
|
|
<!-- enum AudioChannelPosition::variant RearCenter -->
|
|
Rear center
|
|
<!-- enum AudioChannelPosition::variant Lfe2 -->
|
|
Low-frequency effects 2 (subwoofer)
|
|
<!-- enum AudioChannelPosition::variant SideLeft -->
|
|
Side left
|
|
<!-- enum AudioChannelPosition::variant SideRight -->
|
|
Side right
|
|
<!-- enum AudioChannelPosition::variant TopFrontLeft -->
|
|
Top front left
|
|
<!-- enum AudioChannelPosition::variant TopFrontRight -->
|
|
Top front right
|
|
<!-- enum AudioChannelPosition::variant TopFrontCenter -->
|
|
Top front center
|
|
<!-- enum AudioChannelPosition::variant TopCenter -->
|
|
Top center
|
|
<!-- enum AudioChannelPosition::variant TopRearLeft -->
|
|
Top rear left
|
|
<!-- enum AudioChannelPosition::variant TopRearRight -->
|
|
Top rear right
|
|
<!-- enum AudioChannelPosition::variant TopSideLeft -->
|
|
Top side right
|
|
<!-- enum AudioChannelPosition::variant TopSideRight -->
|
|
Top rear right
|
|
<!-- enum AudioChannelPosition::variant TopRearCenter -->
|
|
Top rear center
|
|
<!-- enum AudioChannelPosition::variant BottomFrontCenter -->
|
|
Bottom front center
|
|
<!-- enum AudioChannelPosition::variant BottomFrontLeft -->
|
|
Bottom front left
|
|
<!-- enum AudioChannelPosition::variant BottomFrontRight -->
|
|
Bottom front right
|
|
<!-- enum AudioChannelPosition::variant WideLeft -->
|
|
Wide left (between front left and side left)
|
|
<!-- enum AudioChannelPosition::variant WideRight -->
|
|
Wide right (between front right and side right)
|
|
<!-- enum AudioChannelPosition::variant SurroundLeft -->
|
|
Surround left (between rear left and side left)
|
|
<!-- enum AudioChannelPosition::variant SurroundRight -->
|
|
Surround right (between rear right and side right)
|
|
<!-- enum AudioFormat -->
|
|
Enum value describing the most common audio formats.
|
|
<!-- enum AudioFormat::variant Unknown -->
|
|
unknown or unset audio format
|
|
<!-- enum AudioFormat::variant Encoded -->
|
|
encoded audio format
|
|
<!-- enum AudioFormat::variant S8 -->
|
|
8 bits in 8 bits, signed
|
|
<!-- enum AudioFormat::variant U8 -->
|
|
8 bits in 8 bits, unsigned
|
|
<!-- enum AudioFormat::variant S16le -->
|
|
16 bits in 16 bits, signed, little endian
|
|
<!-- enum AudioFormat::variant S16be -->
|
|
16 bits in 16 bits, signed, big endian
|
|
<!-- enum AudioFormat::variant U16le -->
|
|
16 bits in 16 bits, unsigned, little endian
|
|
<!-- enum AudioFormat::variant U16be -->
|
|
16 bits in 16 bits, unsigned, big endian
|
|
<!-- enum AudioFormat::variant S2432le -->
|
|
24 bits in 32 bits, signed, little endian
|
|
<!-- enum AudioFormat::variant S2432be -->
|
|
24 bits in 32 bits, signed, big endian
|
|
<!-- enum AudioFormat::variant U2432le -->
|
|
24 bits in 32 bits, unsigned, little endian
|
|
<!-- enum AudioFormat::variant U2432be -->
|
|
24 bits in 32 bits, unsigned, big endian
|
|
<!-- enum AudioFormat::variant S32le -->
|
|
32 bits in 32 bits, signed, little endian
|
|
<!-- enum AudioFormat::variant S32be -->
|
|
32 bits in 32 bits, signed, big endian
|
|
<!-- enum AudioFormat::variant U32le -->
|
|
32 bits in 32 bits, unsigned, little endian
|
|
<!-- enum AudioFormat::variant U32be -->
|
|
32 bits in 32 bits, unsigned, big endian
|
|
<!-- enum AudioFormat::variant S24le -->
|
|
24 bits in 24 bits, signed, little endian
|
|
<!-- enum AudioFormat::variant S24be -->
|
|
24 bits in 24 bits, signed, big endian
|
|
<!-- enum AudioFormat::variant U24le -->
|
|
24 bits in 24 bits, unsigned, little endian
|
|
<!-- enum AudioFormat::variant U24be -->
|
|
24 bits in 24 bits, unsigned, big endian
|
|
<!-- enum AudioFormat::variant S20le -->
|
|
20 bits in 24 bits, signed, little endian
|
|
<!-- enum AudioFormat::variant S20be -->
|
|
20 bits in 24 bits, signed, big endian
|
|
<!-- enum AudioFormat::variant U20le -->
|
|
20 bits in 24 bits, unsigned, little endian
|
|
<!-- enum AudioFormat::variant U20be -->
|
|
20 bits in 24 bits, unsigned, big endian
|
|
<!-- enum AudioFormat::variant S18le -->
|
|
18 bits in 24 bits, signed, little endian
|
|
<!-- enum AudioFormat::variant S18be -->
|
|
18 bits in 24 bits, signed, big endian
|
|
<!-- enum AudioFormat::variant U18le -->
|
|
18 bits in 24 bits, unsigned, little endian
|
|
<!-- enum AudioFormat::variant U18be -->
|
|
18 bits in 24 bits, unsigned, big endian
|
|
<!-- enum AudioFormat::variant F32le -->
|
|
32-bit floating point samples, little endian
|
|
<!-- enum AudioFormat::variant F32be -->
|
|
32-bit floating point samples, big endian
|
|
<!-- enum AudioFormat::variant F64le -->
|
|
64-bit floating point samples, little endian
|
|
<!-- enum AudioFormat::variant F64be -->
|
|
64-bit floating point samples, big endian
|
|
<!-- enum AudioFormat::variant S16 -->
|
|
16 bits in 16 bits, signed, native endianness
|
|
<!-- enum AudioFormat::variant U16 -->
|
|
16 bits in 16 bits, unsigned, native endianness
|
|
<!-- enum AudioFormat::variant S2432 -->
|
|
24 bits in 32 bits, signed, native endianness
|
|
<!-- enum AudioFormat::variant U2432 -->
|
|
24 bits in 32 bits, unsigned, native endianness
|
|
<!-- enum AudioFormat::variant S32 -->
|
|
32 bits in 32 bits, signed, native endianness
|
|
<!-- enum AudioFormat::variant U32 -->
|
|
32 bits in 32 bits, unsigned, native endianness
|
|
<!-- enum AudioFormat::variant S24 -->
|
|
24 bits in 24 bits, signed, native endianness
|
|
<!-- enum AudioFormat::variant U24 -->
|
|
24 bits in 24 bits, unsigned, native endianness
|
|
<!-- enum AudioFormat::variant S20 -->
|
|
20 bits in 24 bits, signed, native endianness
|
|
<!-- enum AudioFormat::variant U20 -->
|
|
20 bits in 24 bits, unsigned, native endianness
|
|
<!-- enum AudioFormat::variant S18 -->
|
|
18 bits in 24 bits, signed, native endianness
|
|
<!-- enum AudioFormat::variant U18 -->
|
|
18 bits in 24 bits, unsigned, native endianness
|
|
<!-- enum AudioFormat::variant F32 -->
|
|
32-bit floating point samples, native endianness
|
|
<!-- enum AudioFormat::variant F64 -->
|
|
64-bit floating point samples, native endianness
|
|
<!-- struct AudioFormatInfo -->
|
|
Information for an audio format.
|
|
<!-- struct AudioInfo -->
|
|
Information describing audio properties. This information can be filled
|
|
in from GstCaps with `AudioInfo::from_caps`.
|
|
|
|
Use the provided macros to access the info in this structure.
|
|
<!-- impl AudioInfo::fn new -->
|
|
Allocate a new `AudioInfo` that is also initialized with
|
|
`AudioInfo::init`.
|
|
|
|
# Returns
|
|
|
|
a new `AudioInfo`. free with `AudioInfo::free`.
|
|
<!-- impl AudioInfo::fn convert -->
|
|
Converts among various `gst::Format` types. This function handles
|
|
GST_FORMAT_BYTES, GST_FORMAT_TIME, and GST_FORMAT_DEFAULT. For
|
|
raw audio, GST_FORMAT_DEFAULT corresponds to audio frames. This
|
|
function can be used to handle pad queries of the type GST_QUERY_CONVERT.
|
|
## `src_fmt`
|
|
`gst::Format` of the `src_val`
|
|
## `src_val`
|
|
value to convert
|
|
## `dest_fmt`
|
|
`gst::Format` of the `dest_val`
|
|
## `dest_val`
|
|
pointer to destination value
|
|
|
|
# Returns
|
|
|
|
TRUE if the conversion was successful.
|
|
<!-- impl AudioInfo::fn copy -->
|
|
Copy a GstAudioInfo structure.
|
|
|
|
# Returns
|
|
|
|
a new `AudioInfo`. free with gst_audio_info_free.
|
|
<!-- impl AudioInfo::fn free -->
|
|
Free a GstAudioInfo structure previously allocated with `AudioInfo::new`
|
|
or `AudioInfo::copy`.
|
|
<!-- impl AudioInfo::fn from_caps -->
|
|
Parse `caps` and update `self`.
|
|
## `caps`
|
|
a `gst::Caps`
|
|
|
|
# Returns
|
|
|
|
TRUE if `caps` could be parsed
|
|
<!-- impl AudioInfo::fn init -->
|
|
Initialize `self` with default values.
|
|
<!-- impl AudioInfo::fn is_equal -->
|
|
Compares two `AudioInfo` and returns whether they are equal or not
|
|
## `other`
|
|
a `AudioInfo`
|
|
|
|
# Returns
|
|
|
|
`true` if `self` and `other` are equal, else `false`.
|
|
<!-- impl AudioInfo::fn set_format -->
|
|
Set the default info for the audio info of `format` and `rate` and `channels`.
|
|
|
|
Note: This initializes `self` first, no values are preserved.
|
|
## `format`
|
|
the format
|
|
## `rate`
|
|
the samplerate
|
|
## `channels`
|
|
the number of channels
|
|
## `position`
|
|
the channel positions
|
|
<!-- impl AudioInfo::fn to_caps -->
|
|
Convert the values of `self` into a `gst::Caps`.
|
|
|
|
# Returns
|
|
|
|
the new `gst::Caps` containing the
|
|
info of `self`.
|
|
<!-- enum AudioLayout -->
|
|
Layout of the audio samples for the different channels.
|
|
<!-- enum AudioLayout::variant Interleaved -->
|
|
interleaved audio
|
|
<!-- enum AudioLayout::variant NonInterleaved -->
|
|
non-interleaved audio
|
|
<!-- struct StreamVolume -->
|
|
This interface is implemented by elements that provide a stream volume. Examples for
|
|
such elements are `volume` and `playbin`.
|
|
|
|
Applications can use this interface to get or set the current stream volume. For this
|
|
the "volume" `gobject::Object` property can be used or the helper functions `StreamVolume::set_volume`
|
|
and `StreamVolume::get_volume`. This volume is always a linear factor, i.e. 0.0 is muted
|
|
1.0 is 100%. For showing the volume in a GUI it might make sense to convert it to
|
|
a different format by using `StreamVolume::convert_volume`. Volume sliders should usually
|
|
use a cubic volume.
|
|
|
|
Separate from the volume the stream can also be muted by the "mute" `gobject::Object` property or
|
|
`StreamVolume::set_mute` and `StreamVolume::get_mute`.
|
|
|
|
Elements that provide some kind of stream volume should implement the "volume" and
|
|
"mute" `gobject::Object` properties and handle setting and getting of them properly.
|
|
The volume property is defined to be a linear volume factor.
|
|
|
|
# Implements
|
|
|
|
[`StreamVolumeExt`](trait.StreamVolumeExt.html)
|
|
<!-- trait StreamVolumeExt -->
|
|
Trait containing all `StreamVolume` methods.
|
|
|
|
# Implementors
|
|
|
|
[`StreamVolume`](struct.StreamVolume.html)
|
|
<!-- impl StreamVolume::fn convert_volume -->
|
|
## `from`
|
|
`StreamVolumeFormat` to convert from
|
|
## `to`
|
|
`StreamVolumeFormat` to convert to
|
|
## `val`
|
|
Volume in `from` format that should be converted
|
|
|
|
# Returns
|
|
|
|
the converted volume
|
|
<!-- trait StreamVolumeExt::fn get_mute -->
|
|
|
|
# Returns
|
|
|
|
Returns `true` if the stream is muted
|
|
<!-- trait StreamVolumeExt::fn get_volume -->
|
|
## `format`
|
|
`StreamVolumeFormat` which should be returned
|
|
|
|
# Returns
|
|
|
|
The current stream volume as linear factor
|
|
<!-- trait StreamVolumeExt::fn set_mute -->
|
|
## `mute`
|
|
Mute state that should be set
|
|
<!-- trait StreamVolumeExt::fn set_volume -->
|
|
## `format`
|
|
`StreamVolumeFormat` of `val`
|
|
## `val`
|
|
Linear volume factor that should be set
|
|
<!-- enum StreamVolumeFormat -->
|
|
Different representations of a stream volume. `StreamVolume::convert_volume`
|
|
allows to convert between the different representations.
|
|
|
|
Formulas to convert from a linear to a cubic or dB volume are
|
|
cbrt(val) and 20 * log10 (val).
|
|
<!-- enum StreamVolumeFormat::variant Linear -->
|
|
Linear scale factor, 1.0 = 100%
|
|
<!-- enum StreamVolumeFormat::variant Cubic -->
|
|
Cubic volume scale
|
|
<!-- enum StreamVolumeFormat::variant Db -->
|
|
Logarithmic volume scale (dB, amplitude not power)
|