GstAudioConverter: GStreamer Base Plugins 1.0 Library Reference Manual

## GstAudioConverter GstAudioConverter |

## Functions

GstAudioConverter * | gst_audio_converter_new ()
void | gst_audio_converter_free ()
gboolean | gst_audio_converter_samples ()
gsize | gst_audio_converter_get_in_frames ()
gsize | gst_audio_converter_get_max_latency ()
gsize | gst_audio_converter_get_out_frames ()
const GstStructure * | gst_audio_converter_get_config ()

## Types and Values

| GstAudioConverter
enum | GstAudioConverterFlags
#define | GST_AUDIO_CONVERTER_OPT_DITHER_METHOD
#define | GST_AUDIO_CONVERTER_OPT_NOISE_SHAPING_METHOD
#define | GST_AUDIO_CONVERTER_OPT_QUANTIZATION

## Includes

    #include <gst/audio/audio.h>

## Description

## Functions

### gst_audio_converter_new ()

    GstAudioConverter *
    gst_audio_converter_new (GstAudioConverterFlags flags,
                             GstAudioInfo *in_info,
                             GstAudioInfo *out_info,
                             GstStructure *config);

Create a new GstAudioConverter that is able to convert between `in` and `out` audio formats.

`config` contains extra configuration options, see GST_VIDEO_CONVERTER_OPT_* parameters for details about the options and values.

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#### Parameters

flags | GstAudioConverterFlags |
in_info | a source GstAudioInfo |
out_info | a destination GstAudioInfo |
config | a GstStructure with configuration options. | [transfer full]

#### Returns

a GstAudioConverter or `NULL` if conversion is not possible.

### gst_audio_converter_free ()

    void
    gst_audio_converter_free (GstAudioConverter *convert);

Free a previously allocated `convert` instance.

#### Parameters

convert | a GstAudioConverter |

### gst_audio_converter_samples ()

    gboolean
    gst_audio_converter_samples (GstAudioConverter *convert,
                                 GstAudioConverterFlags flags,
                                 gpointer in[],
                                 gsize in_frames,
                                 gpointer out[],
                                 gsize out_frames);

Perform the conversion with `in_frames` in `in` to `out_frames` in `out` using `convert` .

In case the samples are interleaved, `in` and `out` must point to an array with a single element pointing to a block of interleaved samples.

If non-interleaved samples are used, `in` and `out` must point to an array with pointers to memory blocks, one for each channel.

`in` may be `NULL`, in which case `in_frames` of silence samples are processed by the converter.

This function always produces `out_frames` of output and consumes `in_frames` of input. Use `gst_audio_converter_get_out_frames()` and `gst_audio_converter_get_in_frames()` to make sure `in_frames` and `out_frames` are matching and `in` and `out` point to enough memory.

#### Parameters

convert | a GstAudioConverter |
flags | extra GstAudioConverterFlags |
in | input frames |
in_frames | number of input frames |
out | output frames |
out_frames | number of output frames |

#### Returns

`TRUE` is the conversion could be performed.

### gst_audio_converter_get_in_frames ()

    gsize
    gst_audio_converter_get_in_frames (GstAudioConverter *convert,
                                       gsize out_frames);

Calculate how many input frames are currently needed by `convert` to produce `out_frames` of output frames.

#### Parameters

convert | a GstAudioConverter |
out_frames | number of output frames |

#### Returns

the number of input frames

### gst_audio_converter_get_max_latency ()

    gsize
    gst_audio_converter_get_max_latency (GstAudioConverter *convert);

Get the maximum number of input frames that the converter would need before producing output.

#### Parameters

convert | a GstAudioConverter |

#### Returns

the latency of `convert` as expressed in the number of frames.

### gst_audio_converter_get_out_frames ()

    gsize
    gst_audio_converter_get_out_frames (GstAudioConverter *convert,
                                        gsize in_frames);

Calculate how many output frames can be produced when `in_frames` input frames are given to `convert` .

#### Parameters

convert | a GstAudioConverter |
in_frames | number of input frames |

#### Returns

the number of output frames

### gst_audio_converter_get_config ()

    const GstStructure *
    gst_audio_converter_get_config (GstAudioConverter *convert,
                                    gint *in_rate,
                                    gint *out_rate);

Get the current configuration of `convert` .

#### Parameters

convert | a GstAudioConverter |
in_rate | result input rate |
out_rate | result output rate |

#### Returns

a GstStructure that remains valid for as long as `convert` is valid or until `gst_audio_converter_update_config()` is called.

## Types and Values

### GstAudioConverter

    typedef struct _GstAudioConverter GstAudioConverter;

### enum GstAudioConverterFlags

Extra flags passed to `gst_audio_converter_new()` and `gst_audio_converter_samples()`.

#### Members

GST_AUDIO_CONVERTER_FLAG_NONE | no flag |
GST_AUDIO_CONVERTER_FLAG_IN_WRITABLE | the input sample arrays are writable and can be used as temporary storage during conversion. |
GST_AUDIO_CONVERTER_FLAG_VARIABLE_RATE | allow arbitrary rate updates with `gst_audio_converter_update_config()`. |

### GST_AUDIO_CONVERTER_OPT_DITHER_METHOD

    #define GST_AUDIO_CONVERTER_OPT_DITHER_METHOD   "GstAudioConverter.dither-method"

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

### GST_AUDIO_CONVERTER_OPT_NOISE_SHAPING_METHOD

    #define GST_AUDIO_CONVERTER_OPT_NOISE_SHAPING_METHOD   "GstAudioConverter.noise-shaping-method"

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

### GST_AUDIO_CONVERTER_OPT_QUANTIZATION

    #define GST_AUDIO_CONVERTER_OPT_QUANTIZATION   "GstAudioConverter.quantization"

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