Top |
Properties
GValueArray * | channel-positions | Read / Write |
GstRawAudioParseFormat | format | Read / Write |
gboolean | interleaved | Read / Write |
gint | num-channels | Read / Write |
GstAudioFormat | pcm-format | Read / Write |
gint | sample-rate | Read / Write |
Object Hierarchy
GObject ╰── GInitiallyUnowned ╰── GstObject ╰── GstElement ╰── GstBaseParse ╰── GstRawBaseParse ╰── GstRawAudioParse
Description
This element parses incoming data as raw audio samples and timestamps it. It also handles seek queries in said raw audio data, and ensures that output buffers contain an integer number of samples, even if the input buffers don't. For example, with sample format S16LE and 2 channels, an input buffer of 411 bytes contains 102.75 samples. rawaudioparse will then output 102 samples (= 408 bytes) and keep the remaining 3 bytes. These will then be prepended to the next input data.
The element implements the properties and sink caps configuration as specified in the GstRawBaseParse documentation. The properties configuration can be modified by using the sample-rate, num-channels, channel-positions, format, and pcm-format properties.
Currently, this parser supports raw data in a-law, mu-law, or linear PCM format.
To facilitate operation with the unalignedaudioparse element, rawaudioparse supports the "audio/x-unaligned-raw" media type. This is treated identically to "audio/x-raw", except that it is used by source elements which do not guarantee that the buffers they push out are timestamped and contain an integer amount of samples (see the 411 bytes example above). By using a different media type, it is guaranteed that unalignedaudioparse is autoplugged, making sure that the autoplugged chain does not push unparsed content downstream. The source caps' media type with linear PCM data is always "audio/x-raw", even if the sink caps use "audio/x-unaligned-raw".
The channel-positions property can be used to set explicit position information for each channel. If the array that is passed to this property does not match the number of channels indicated by num-channels, then said number of channels is updated to the array length. If channel-positions is NULL, then the default GStreamer positioning is used. This property is also useful for swapping left and right in a stereo signal for example.
Example pipelines
1 2 |
gst-launch-1.0 souphttpsrc http://my-dlna-server/track.l16 \ rawaudioparse ! audioconvert ! audioresample ! autoaudiosink |
1 2 3 |
gst-launch-1.0 filesrc location=audio.raw ! rawaudioparse use-sink-caps=false \ format=pcm pcm-format=s16le sample-rate=48000 num-channels=2 \ audioconvert ! audioresample ! autoaudiosink |
Synopsis
Element Information
plugin |
rawparse |
author |
Carlos Rafael Giani <dv@pseudoterminal.org> |
class |
Codec/Parser/Audio |
Element Pads
name |
sink |
direction |
sink |
presence |
always |
details |
audio/x-unaligned-raw, format=(string){ S8, U8, S16LE, S16BE, U16LE, U16BE, S24_32LE, S24_32BE, U24_32LE, U24_32BE, S32LE, S32BE, U32LE, U32BE, S24LE, S24BE, U24LE, U24BE, S20LE, S20BE, U20LE, U20BE, S18LE, S18BE, U18LE, U18BE, F32LE, F32BE, F64LE, F64BE }, rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2147483647 ], layout=(string){ interleaved, non-interleaved } |
audio/x-raw, format=(string){ S8, U8, S16LE, S16BE, U16LE, U16BE, S24_32LE, S24_32BE, U24_32LE, U24_32BE, S32LE, S32BE, U32LE, U32BE, S24LE, S24BE, U24LE, U24BE, S20LE, S20BE, U20LE, U20BE, S18LE, S18BE, U18LE, U18BE, F32LE, F32BE, F64LE, F64BE }, rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2147483647 ], layout=(string){ interleaved, non-interleaved } | |
audio/x-alaw, rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2147483647 ] | |
audio/x-mulaw, rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2147483647 ] |
name |
src |
direction |
source |
presence |
always |
details |
audio/x-raw, format=(string){ S8, U8, S16LE, S16BE, U16LE, U16BE, S24_32LE, S24_32BE, U24_32LE, U24_32BE, S32LE, S32BE, U32LE, U32BE, S24LE, S24BE, U24LE, U24BE, S20LE, S20BE, U20LE, U20BE, S18LE, S18BE, U18LE, U18BE, F32LE, F32BE, F64LE, F64BE }, rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2147483647 ], layout=(string){ interleaved, non-interleaved } |
audio/x-alaw, rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2147483647 ] | |
audio/x-mulaw, rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2147483647 ] |
Property Details
The “channel-positions”
property
“channel-positions” GValueArray *
Channel positions used on the output.
Flags: Read / Write
The “format”
property
“format” GstRawAudioParseFormat
Format of the raw audio stream.
Flags: Read / Write
Default value: PCM
The “interleaved”
property
“interleaved” gboolean
True if audio has interleaved layout.
Flags: Read / Write
Default value: TRUE
The “num-channels”
property
“num-channels” gint
Number of channels in raw stream.
Flags: Read / Write
Allowed values: >= 1
Default value: 2
The “pcm-format”
property
“pcm-format” GstAudioFormat
Format of audio samples in PCM stream (ignored if format property is not set to pcm).
Flags: Read / Write
Default value: GST_AUDIO_FORMAT_UNKNOWN
The “sample-rate”
property
“sample-rate” gint
Rate of audio samples in raw stream.
Flags: Read / Write
Allowed values: >= 1
Default value: 44100