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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<title>audioconvert: GStreamer Base Plugins 1.0 Plugins Reference Manual</title>
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<meta name="generator" content="DocBook XSL Stylesheets V1.79.1">
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<link rel="home" href="index.html" title="GStreamer Base Plugins 1.0 Plugins Reference Manual">
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<link rel="up" href="ch01.html" title="gst-plugins-base Elements">
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<link rel="prev" href="gst-plugins-base-plugins-appsrc.html" title="appsrc">
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<link rel="next" href="gst-plugins-base-plugins-audiointerleave.html" title="audiointerleave">
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<meta name="generator" content="GTK-Doc V1.28 (XML mode)">
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<link rel="stylesheet" href="style.css" type="text/css">
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</head>
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<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
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Top |
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Description |
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Object Hierarchy |
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Properties
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audioconvert
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audioconvert
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Properties
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GstAudioDitherMethod
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dithering
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Read / Write
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GstAudioNoiseShapingMethod
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noise-shaping
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Read / Write
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GstValueArray
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mix-matrix
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Read / Write
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Types and Values
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struct
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GstAudioConvert
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Object Hierarchy
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GObject
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╰── GInitiallyUnowned
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╰── GstObject
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╰── GstElement
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╰── GstBaseTransform
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╰── GstAudioConvert
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Description
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Audioconvert converts raw audio buffers between various possible formats.
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It supports integer to float conversion, width/depth conversion,
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signedness and endianness conversion and channel transformations
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(ie. upmixing and downmixing), as well as dithering and noise-shaping.
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Example launch line
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1
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gst-launch-1.0 -v -m audiotestsrc ! audioconvert ! audio/x-raw,format=S8,channels=2 ! level ! fakesink silent=TRUE
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This pipeline converts audio to 8-bit. The level element shows that
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the output levels still match the one for a sine wave.
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1
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gst-launch-1.0 -v -m uridecodebin uri=file:///path/to/audio.flac ! audioconvert ! vorbisenc ! oggmux ! filesink location=audio.ogg
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The vorbis encoder takes float audio data instead of the integer data
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output by most other audio elements. This pipeline decodes a FLAC audio file
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(or any other audio file for which decoders are installed) and re-encodes
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it into an Ogg/Vorbis audio file.
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A mix matrix can be passed to audioconvert, that will govern the
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remapping of input to output channels.
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Example matrix generation code
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To generate the matrix using code:
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1
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16
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GValue v = G_VALUE_INIT;
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GValue v2 = G_VALUE_INIT;
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GValue v3 = G_VALUE_INIT;
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g_value_init (&v2, GST_TYPE_ARRAY);
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g_value_init (&v3, G_TYPE_FLOAT);
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g_value_set_float (&v3, 1);
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gst_value_array_append_value (&v2, &v3);
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g_value_unset (&v3);
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[ Repeat for as many float as your input channels - unset and reinit v3 ]
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g_value_init (&v, GST_TYPE_ARRAY);
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gst_value_array_append_value (&v, &v2);
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g_value_unset (&v2);
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[ Repeat for as many v2's as your output channels - unset and reinit v2]
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g_object_set_property (G_OBJECT (audioconvert), "mix-matrix", &v);
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g_value_unset (&v);
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Example launch line
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1
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gst-launch-1.0 audiotestsrc ! audio/x-raw, channels=4 ! audioconvert mix-matrix="<<(float)1.0, (float)0.0, (float)0.0, (float)0.0>, <(float)0.0, (float)1.0, (float)0.0, (float)0.0>>" ! audio/x-raw,channels=2 ! autoaudiosink
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If an empty mix matrix is specified, a (potentially truncated)
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identity matrix will be generated.
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Example empty matrix generation code
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GValue v = G_VALUE_INIT;
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g_value_init (&v, GST_TYPE_ARRAY);
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g_object_set_property (G_OBJECT (audioconvert), "mix-matrix", &v);
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g_value_unset (&v);
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Example empty matrix launch line
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1
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gst-launch-1.0 -v audiotestsrc ! audio/x-raw,channels=8 ! audioconvert mix-matrix="<>" ! audio/x-raw,channels=16,channel-mask=\(bitmask\)0x0000000000000000 ! fakesink
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Synopsis
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Element Information
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plugin
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audioconvert
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author
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Benjamin Otte <otte@gnome.org>
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class
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Filter/Converter/Audio
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Element Pads
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name
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sink
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direction
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sink
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presence
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always
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details
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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 }
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name
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src
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direction
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source
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presence
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always
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details
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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 }
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Functions
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Types and Values
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struct GstAudioConvert
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struct GstAudioConvert;
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The audioconvert object structure.
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Property Details
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The “dithering” property
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“dithering” GstAudioDitherMethod
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Selects between different dithering methods.
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Flags: Read / Write
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Default value: GST_AUDIO_DITHER_TPDF
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The “noise-shaping” property
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“noise-shaping” GstAudioNoiseShapingMethod
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Selects between different noise shaping methods.
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Flags: Read / Write
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Default value: GST_AUDIO_NOISE_SHAPING_NONE
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The “mix-matrix” property
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“mix-matrix” GstValueArray
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Transformation matrix for input/output channels.
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Flags: Read / Write
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