GI.GstAudio.Constants

Documentation

pattern META_TAG_AUDIO_STR :: Text

This metadata is relevant for audio streams.

Since: 1.2

pattern META_TAG_AUDIO_RATE_STR :: Text

This metadata stays relevant as long as sample rate is unchanged.

Since: 1.8

pattern META_TAG_AUDIO_CHANNELS_STR :: Text

This metadata stays relevant as long as channels are unchanged.

Since: 1.2

pattern AUDIO_RESAMPLER_QUALITY_MIN :: Int32

No description available in the introspection data.

pattern AUDIO_RESAMPLER_QUALITY_MAX :: Int32

No description available in the introspection data.

pattern AUDIO_RESAMPLER_QUALITY_DEFAULT :: Int32

No description available in the introspection data.

pattern AUDIO_RESAMPLER_OPT_TRANSITION_BANDWIDTH :: Text

G_TYPE_DOUBLE, transition bandwidth. The width of the transition band for the kaiser window. 0.087 is the default.

pattern AUDIO_RESAMPLER_OPT_STOP_ATTENUATION :: Text

G_TYPE_DOUBLE, stopband attenuation in decibels. The attenuation after the stopband for the kaiser window. 85 dB is the default.

pattern AUDIO_RESAMPLER_OPT_N_TAPS :: Text

G_TYPE_INT: the number of taps to use for the filter. 0 is the default and selects the taps automatically.

pattern AUDIO_RESAMPLER_OPT_MAX_PHASE_ERROR :: Text

G_TYPE_DOUBLE: The maximum allowed phase error when switching sample rates. 0.1 is the default.

pattern AUDIO_RESAMPLER_OPT_FILTER_OVERSAMPLE :: Text

G_TYPE_UINT, oversampling to use when interpolating filters 8 is the default.

pattern AUDIO_RESAMPLER_OPT_FILTER_MODE_THRESHOLD :: Text

G_TYPE_UINT: the amount of memory to use for full filter tables before switching to interpolated filter tables. 1048576 is the default.

pattern AUDIO_RESAMPLER_OPT_FILTER_MODE :: Text

GST_TYPE_AUDIO_RESAMPLER_FILTER_MODE: how the filter tables should be constructed. GST_AUDIO_RESAMPLER_FILTER_MODE_AUTO is the default.

pattern AUDIO_RESAMPLER_OPT_FILTER_INTERPOLATION :: Text

GST_TYPE_AUDIO_RESAMPLER_INTERPOLATION: how the filter coefficients should be interpolated. GST_AUDIO_RESAMPLER_FILTER_INTERPOLATION_CUBIC is default.

pattern AUDIO_RESAMPLER_OPT_CUTOFF :: Text

G_TYPE_DOUBLE, Cutoff parameter for the filter. 0.940 is the default.

pattern AUDIO_RESAMPLER_OPT_CUBIC_C :: Text

G_TYPE_DOUBLE, C parameter of the cubic filter. Values between 0.0 and 2.0 are accepted. 0.0 is the default.

See AUDIO_RESAMPLER_OPT_CUBIC_B for some more common values

pattern AUDIO_RESAMPLER_OPT_CUBIC_B :: Text

G_TYPE_DOUBLE, B parameter of the cubic filter. Values between 0.0 and 2.0 are accepted. 1.0 is the default.

Below are some values of popular filters: B C Hermite 0.0 0.0 Spline 1.0 0.0 Catmull-Rom 0.0 1/2

pattern AUDIO_RATE_RANGE :: Text

Maximum range of allowed sample rates, for use in template caps strings.

pattern AUDIO_FORMATS_ALL :: Text

List of all audio formats, for use in template caps strings.

Formats are sorted by decreasing "quality", using these criteria by priority: - depth - width - Float > Signed > Unsigned - native endianness preferred

pattern AUDIO_ENCODER_SRC_NAME :: Text

the name of the templates for the source pad

pattern AUDIO_ENCODER_SINK_NAME :: Text

the name of the templates for the sink pad

pattern AUDIO_DEF_RATE :: Int32

Standard sampling rate used in consumer audio.

pattern AUDIO_DEF_FORMAT :: Text

Standard format used in consumer audio.

pattern AUDIO_DEF_CHANNELS :: Int32

Standard number of channels used in consumer audio.

pattern AUDIO_DECODER_SRC_NAME :: Text

The name of the templates for the source pad.

pattern AUDIO_DECODER_SINK_NAME :: Text

The name of the templates for the sink pad.

pattern AUDIO_DECODER_MAX_ERRORS :: Int32

Default maximum number of errors tolerated before signaling error.

pattern AUDIO_CONVERTER_OPT_RESAMPLER_METHOD :: Text

AudioResamplerMethod, The resampler method to use when changing sample rates. Default is GST_AUDIO_RESAMPLER_METHOD_BLACKMAN_NUTTALL.

pattern AUDIO_CONVERTER_OPT_QUANTIZATION :: Text

G_TYPE_UINT, The quantization amount. Components will be quantized to multiples of this value. Default is 1

pattern AUDIO_CONVERTER_OPT_NOISE_SHAPING_METHOD :: Text

AudioNoiseShapingMethod, The noise shaping method to use to mask noise from quantization errors. Default is GST_AUDIO_NOISE_SHAPING_NONE.

pattern AUDIO_CONVERTER_OPT_MIX_MATRIX :: Text

GST_TYPE_LIST, The channel mapping matrix.

The matrix coefficients must be between -1 and 1: the number of rows is equal to the number of output channels and the number of columns is equal to the number of input channels.

Example matrix generation code

To generate the matrix using code:

GValue v = G_VALUE_INIT;
GValue v2 = G_VALUE_INIT;
GValue v3 = G_VALUE_INIT;

g_value_init (&v2, GST_TYPE_ARRAY);
g_value_init (&v3, G_TYPE_DOUBLE);
g_value_set_double (&v3, 1);
gst_value_array_append_value (&v2, &v3);
g_value_unset (&v3);
[ Repeat for as many double as your input channels - unset and reinit v3 ]
g_value_init (&v, GST_TYPE_ARRAY);
gst_value_array_append_value (&v, &v2);
g_value_unset (&v2);
[ Repeat for as many v2's as your output channels - unset and reinit v2]
g_object_set_property (G_OBJECT (audiomixmatrix), "matrix", &v);
g_value_unset (&v);

pattern AUDIO_CONVERTER_OPT_DITHER_METHOD :: Text

AudioDitherMethod, The dither method to use when changing bit depth. Default is GST_AUDIO_DITHER_NONE.

pattern AUDIO_CHANNELS_RANGE :: Text

Maximum range of allowed channels, for use in template caps strings.