![]() |
![]() |
![]() |
GStreamer Base Plugins 1.0 Plugins Reference Manual | ![]() |
---|---|---|---|---|
Top | Description | Object Hierarchy | Properties |
GObject +----GInitiallyUnowned +----GstObject +----GstElement +----GstBaseTransform +----GstAudioResample
"filter-length" gint : Read / Write "quality" gint : Read / Write / Construct "sinc-filter-auto-threshold" guint : Read / Write "sinc-filter-mode" SpeexResamplerSincFilterMode : Read / Write
audioresample resamples raw audio buffers to different sample rates using a configurable windowing function to enhance quality.
By default, the resampler uses a reduced sinc table, with cubic interpolation filling in the gaps. This ensures that the table does not become too big. However, the interpolation increases the CPU usage considerably. As an alternative, a full sinc table can be used. Doing so can drastically reduce CPU usage (4x faster with 44.1 -> 48 kHz conversions for example), at the cost of increased memory consumption, plus the sinc table takes longer to initialize when the element is created. A third mode exists, which uses the full table unless said table would become too large, in which case the interpolated one is used instead.
1 |
gst-launch -v filesrc location=sine.ogg ! oggdemux ! vorbisdec ! audioconvert ! audioresample ! audio/x-raw, rate=8000 ! alsasink |
plugin |
audioresample |
author |
Sebastian Dröge <sebastian.droege@collabora.co.uk> |
class |
Filter/Converter/Audio |
name |
sink |
direction |
sink |
presence |
always |
details |
audio/x-raw, format=(string){ F32LE, F64LE, S32LE, S24LE, S16LE, S8 }, rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2147483647 ], layout=(string){ interleaved, non-interleaved } |
name |
src |
direction |
source |
presence |
always |
details |
audio/x-raw, format=(string){ F32LE, F64LE, S32LE, S24LE, S16LE, S8 }, rate=(int)[ 1, 2147483647 ], channels=(int)[ 1, 2147483647 ], layout=(string){ interleaved, non-interleaved } |
"filter-length"
property"filter-length" gint : Read / Write
Length of the resample filter.
Allowed values: >= 0
Default value: 64
"quality"
property"quality" gint : Read / Write / Construct
Resample quality with 0 being the lowest and 10 being the best.
Allowed values: [0,10]
Default value: 4
"sinc-filter-auto-threshold"
property"sinc-filter-auto-threshold" guint : Read / Write
Memory usage threshold to use if sinc filter mode is AUTO, given in bytes.
Default value: 1048576