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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>GstAudioConverter: GStreamer Base Plugins 1.0 Library 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 Library Reference Manual">
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<link rel="up" href="gstreamer-audio.html" title="Audio Library">
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<link rel="prev" href="gst-plugins-base-libs-Audio-channels.html" title="Audio-channels">
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<link rel="next" href="gst-plugins-base-libs-GstAudioQuantize.html" title="GstAudioQuantize">
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<meta name="generator" content="GTK-Doc V1.27 (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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GstAudioConverter
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GstAudioConverter
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Functions
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GstAudioConverter *
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gst_audio_converter_new ()
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void
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gst_audio_converter_free ()
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gboolean
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gst_audio_converter_samples ()
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gboolean
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gst_audio_converter_convert ()
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gsize
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gst_audio_converter_get_in_frames ()
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gsize
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gst_audio_converter_get_max_latency ()
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gsize
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gst_audio_converter_get_out_frames ()
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gboolean
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gst_audio_converter_update_config ()
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const GstStructure *
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gst_audio_converter_get_config ()
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void
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gst_audio_converter_reset ()
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gboolean
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gst_audio_converter_supports_inplace ()
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Types and Values
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GstAudioConverter
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enum
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GstAudioConverterFlags
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#define
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GST_AUDIO_CONVERTER_OPT_DITHER_METHOD
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#define
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GST_AUDIO_CONVERTER_OPT_NOISE_SHAPING_METHOD
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#define
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GST_AUDIO_CONVERTER_OPT_QUANTIZATION
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Includes
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#include <gst/audio/audio.h>
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Description
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Functions
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gst_audio_converter_new ()
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GstAudioConverter *
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gst_audio_converter_new (GstAudioConverterFlags flags,
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GstAudioInfo *in_info,
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GstAudioInfo *out_info,
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GstStructure *config);
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Create a new GstAudioConverter that is able to convert between in
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and out
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audio formats.
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config
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contains extra configuration options, see GST_VIDEO_CONVERTER_OPT_*
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parameters for details about the options and values.
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Parameters
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flags
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extra GstAudioConverterFlags
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in_info
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a source GstAudioInfo
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out_info
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a destination GstAudioInfo
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config
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a GstStructure with configuration options.
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[transfer full][nullable]
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Returns
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a GstAudioConverter or NULL if conversion is not possible.
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gst_audio_converter_free ()
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void
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gst_audio_converter_free (GstAudioConverter *convert);
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Free a previously allocated convert
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instance.
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Parameters
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convert
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a GstAudioConverter
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gst_audio_converter_samples ()
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gboolean
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gst_audio_converter_samples (GstAudioConverter *convert,
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GstAudioConverterFlags flags,
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gpointer in[],
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gsize in_frames,
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gpointer out[],
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gsize out_frames);
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Perform the conversion with in_frames
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in in
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to out_frames
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in out
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using convert
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In case the samples are interleaved, in
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and out
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must point to an
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array with a single element pointing to a block of interleaved samples.
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If non-interleaved samples are used, in
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and out
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must point to an
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array with pointers to memory blocks, one for each channel.
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in
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may be NULL, in which case in_frames
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of silence samples are processed
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by the converter.
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This function always produces out_frames
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of output and consumes in_frames
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of
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input. Use gst_audio_converter_get_out_frames() and
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gst_audio_converter_get_in_frames() to make sure in_frames
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and out_frames
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are matching and in
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and out
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point to enough memory.
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Parameters
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convert
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a GstAudioConverter
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flags
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extra GstAudioConverterFlags
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in
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input frames
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in_frames
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number of input frames
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out
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output frames
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out_frames
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number of output frames
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Returns
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TRUE is the conversion could be performed.
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gst_audio_converter_convert ()
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gboolean
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gst_audio_converter_convert (GstAudioConverter *convert,
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GstAudioConverterFlags flags,
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gpointer in,
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gsize in_size,
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gpointer *out,
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gsize *out_size);
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Convenience wrapper around gst_audio_converter_samples(), which will
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perform allocation of the output buffer based on the result from
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gst_audio_converter_get_out_frames().
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Parameters
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flags
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extra GstAudioConverterFlags
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in
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input data.
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[array length=in_size][element-type guint8]
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in_size
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size of in
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out
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a pointer where
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the output data will be written.
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[out][array length=out_size][element-type guint8]
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out_size
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a pointer where the size of out
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will be written.
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[out]
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Returns
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TRUE is the conversion could be performed.
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Since: 1.14
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gst_audio_converter_get_in_frames ()
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gsize
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gst_audio_converter_get_in_frames (GstAudioConverter *convert,
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971217 |
gsize out_frames);
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971217 |
Calculate how many input frames are currently needed by convert
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to produce
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out_frames
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of output frames.
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Parameters
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convert
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971217 |
a GstAudioConverter
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971217 |
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out_frames
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number of output frames
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Returns
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the number of input frames
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gst_audio_converter_get_max_latency ()
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gsize
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gst_audio_converter_get_max_latency (GstAudioConverter *convert);
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Get the maximum number of input frames that the converter would
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need before producing output.
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Parameters
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convert
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a GstAudioConverter
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Returns
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the latency of convert
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as expressed in the number of
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frames.
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gst_audio_converter_get_out_frames ()
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971217 |
gsize
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gst_audio_converter_get_out_frames (GstAudioConverter *convert,
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971217 |
gsize in_frames);
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Calculate how many output frames can be produced when in_frames
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input
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frames are given to convert
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.
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Parameters
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convert
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a GstAudioConverter
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971217 |
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971217 |
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in_frames
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number of input frames
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Returns
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the number of output frames
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gst_audio_converter_update_config ()
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gboolean
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gst_audio_converter_update_config (GstAudioConverter *convert,
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gint in_rate,
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gint out_rate,
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GstStructure *config);
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Set in_rate
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, out_rate
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and config
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as extra configuration for convert
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.
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in_rate
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and out_rate
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specify the new sample rates of input and output
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formats. A value of 0 leaves the sample rate unchanged.
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config
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can be NULL, in which case, the current configuration is not
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changed.
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If the parameters in config
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can not be set exactly, this function returns
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FALSE and will try to update as much state as possible. The new state can
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then be retrieved and refined with gst_audio_converter_get_config().
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971217 |
Look at the GST_AUDIO_CONVERTER_OPT_* fields to check valid configuration
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971217 |
option and values.
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Parameters
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Packit |
971217 |
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971217 |
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971217 |
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971217 |
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convert
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971217 |
a GstAudioConverter
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Packit |
971217 |
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Packit |
971217 |
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971217 |
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in_rate
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input rate
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out_rate
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output rate
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config
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a GstStructure or NULL.
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971217 |
[transfer full][allow-none]
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Returns
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TRUE when the new parameters could be set
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gst_audio_converter_get_config ()
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971217 |
const GstStructure *
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971217 |
gst_audio_converter_get_config (GstAudioConverter *convert,
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971217 |
gint *in_rate,
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971217 |
gint *out_rate);
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971217 |
Get the current configuration of convert
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971217 |
.
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971217 |
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971217 |
Parameters
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Packit |
971217 |
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971217 |
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971217 |
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971217 |
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971217 |
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971217 |
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Packit |
971217 |
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Packit |
971217 |
|
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Packit |
971217 |
convert
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Packit |
971217 |
a GstAudioConverter
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Packit |
971217 |
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Packit |
971217 |
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Packit |
971217 |
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971217 |
in_rate
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971217 |
result input rate.
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971217 |
[out][optional]
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971217 |
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971217 |
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971217 |
out_rate
|
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result output rate.
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[out][optional]
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971217 |
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Returns
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a GstStructure that remains valid for as long as convert
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is valid
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971217 |
or until gst_audio_converter_update_config() is called.
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[transfer none]
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971217 |
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971217 |
gst_audio_converter_reset ()
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971217 |
void
|
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Packit |
971217 |
gst_audio_converter_reset (GstAudioConverter *convert);
|
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Packit |
971217 |
Reset convert
|
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Packit |
971217 |
to the state it was when it was first created, clearing
|
|
Packit |
971217 |
any history it might currently have.
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971217 |
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971217 |
Parameters
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Packit |
971217 |
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Packit |
971217 |
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971217 |
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971217 |
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971217 |
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971217 |
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Packit |
971217 |
|
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Packit |
971217 |
convert
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971217 |
a GstAudioConverter
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Packit |
971217 |
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971217 |
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971217 |
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971217 |
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971217 |
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971217 |
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971217 |
|
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971217 |
gst_audio_converter_supports_inplace ()
|
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Packit |
971217 |
gboolean
|
|
Packit |
971217 |
gst_audio_converter_supports_inplace (GstAudioConverter *convert);
|
|
Packit |
971217 |
Returns whether the audio converter can perform the conversion in-place.
|
|
Packit |
971217 |
The return value would be typically input to gst_base_transform_set_in_place()
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971217 |
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971217 |
Parameters
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971217 |
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971217 |
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971217 |
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971217 |
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971217 |
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971217 |
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971217 |
|
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971217 |
convert
|
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Packit |
971217 |
a GstAudioConverter
|
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Packit |
971217 |
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Packit |
971217 |
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971217 |
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971217 |
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971217 |
|
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971217 |
Returns
|
|
Packit |
971217 |
TRUE when the conversion can be done in place.
|
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971217 |
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971217 |
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971217 |
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Types and Values
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971217 |
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971217 |
GstAudioConverter
|
|
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971217 |
typedef struct _GstAudioConverter GstAudioConverter;
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971217 |
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971217 |
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971217 |
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|
Packit |
971217 |
enum GstAudioConverterFlags
|
|
Packit |
971217 |
Extra flags passed to gst_audio_converter_new() and gst_audio_converter_samples().
|
|
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971217 |
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971217 |
Members
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GST_AUDIO_CONVERTER_FLAG_NONE
|
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no flag
|
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GST_AUDIO_CONVERTER_FLAG_IN_WRITABLE
|
|
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971217 |
|
|
Packit |
971217 |
the input sample arrays are writable and can be
|
|
Packit |
971217 |
used as temporary storage during conversion.
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971217 |
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971217 |
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971217 |
GST_AUDIO_CONVERTER_FLAG_VARIABLE_RATE
|
|
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971217 |
|
|
Packit |
971217 |
allow arbitrary rate updates with
|
|
Packit |
971217 |
gst_audio_converter_update_config().
|
|
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971217 |
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971217 |
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971217 |
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971217 |
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971217 |
GST_AUDIO_CONVERTER_OPT_DITHER_METHOD
|
|
Packit |
971217 |
#define GST_AUDIO_CONVERTER_OPT_DITHER_METHOD "GstAudioConverter.dither-method"
|
|
Packit |
971217 |
|
|
Packit |
971217 |
GST_TYPE_AUDIO_DITHER_METHOD, The dither method to use when
|
|
Packit |
971217 |
changing bit depth.
|
|
Packit |
971217 |
Default is GST_AUDIO_DITHER_NONE.
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971217 |
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971217 |
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GST_AUDIO_CONVERTER_OPT_NOISE_SHAPING_METHOD
|
|
Packit |
971217 |
#define GST_AUDIO_CONVERTER_OPT_NOISE_SHAPING_METHOD "GstAudioConverter.noise-shaping-method"
|
|
Packit |
971217 |
|
|
Packit |
971217 |
GST_TYPE_AUDIO_NOISE_SHAPING_METHOD, The noise shaping method to use
|
|
Packit |
971217 |
to mask noise from quantization errors.
|
|
Packit |
971217 |
Default is GST_AUDIO_NOISE_SHAPING_NONE.
|
|
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971217 |
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971217 |
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971217 |
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971217 |
GST_AUDIO_CONVERTER_OPT_QUANTIZATION
|
|
Packit |
971217 |
#define GST_AUDIO_CONVERTER_OPT_QUANTIZATION "GstAudioConverter.quantization"
|
|
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971217 |
|
|
Packit |
971217 |
G_TYPE_UINT, The quantization amount. Components will be
|
|
Packit |
971217 |
quantized to multiples of this value.
|
|
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971217 |
Default is 1
|
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971217 |
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971217 |
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Generated by GTK-Doc V1.27
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</body>
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</html>
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