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----
-layout: default
----
-
-# Callback API
-
-The callback API consists of the following functions :
-
-```c
-typedef long (*src_callback_t) (void *cb_data, float **data) ;
-
-SRC_STATE* src_callback_new (src_callback_t func,
-                    int converter_type, int channels,
-                    int *error, void* cb_data) ;
-
-SRC_STATE* src_delete (SRC_STATE *state) ;
-
-long src_callback_read (SRC_STATE *state, double src_ratio,
-                    long frames, float *data) ;
-
-int src_reset (SRC_STATE *state) ;
-int src_set_ratio (SRC_STATE *state, double new_ratio) ;
-```
-
-Like the [simple API](api_simple.md) and the [full API](api_full.md), the
-callback based API is able to operate on interleaved multi channel data.
-
-An example of the use of the callback based API can be found in the
-**varispeed-play** program in the **examples/** directory of the source code
-tarball.
-
-## Initialisation
-
-```c
-SRC_STATE* src_callback_new (src_callback_t func,
-                    int converter_type, int channels,
-                    int *error, void* cb_data) ;
-```
-
-The **src_callback_new** function returns an anonymous pointer to a sample rate
-converter callback object, src_state. This is the same type of object as that
-returned by [src\_new](api_full.md#initialisation), but with different internal
-state. Although these are the same object type, they cannot be used
-interchangeably. If an error occurs the function returns a NULL pointer and
-fills in the error value pointed to by the **error** pointer supplied by the
-caller.
-
-The caller then passes the SRC_STATE object to the **src_callback_read**
-function to pull data out of the converter. When the caller is finished with the
-converter they should pass it to the clean up function [src_delete](api_full.md#cleanup).
-
-The **func** parameter is a user supplied function which must match the
-**src_callback_t** type signature while **cb_data** is a pointer to data which
-be passed as the first parameter to the user supplied callback function. This
-function is called by the converter whenever it needs input data as a result of
-being calls to **src_callback_read**.
-
-If the converter was initialised to work with more than one channel, the
-callback function must work with mutiple channels of interleaved data. The
-callback function should return the number of frames it supplying to the
-converter. For multi channel files, this return value should be the number of
-floats divided by the number of channels.
-
-The converter must be one of the supplied converter types documented [here](api_misc.md#converters).
-
-The caller then passes the SRC_STATE pointer to the **src_callback_read**
-function to pull data out of the converter.
-
-## Callback Read
-
-```c
-long src_callback_read (SRC_STATE *state, double src_ratio,
-                    long frames, float *data) ;
-```
-
-The **src_callback_read** function is passed the [**SRC_STATE**](api_misc.md#src_data)
-pointer returned by **src_callback_new**, the coversion ratio
-(output_sample_rate / input_sample_rate), the maximum number of output frames to
-generate and a pointer to a buffer in which to place the output data. For multi
-channel files, the data int the output buffer is stored in interleaved format.
-
-The **src_callback_read** function returns the number of frames generated or
-zero if an error occurs or it runs out of input (ie the user supplied callback
-function returns zero and there is no more data buffered internally). If an
-error has occurred, the function [src_error](api_misc.md#error-reporting)
-will return non-zero.
-
-See also : [**src_set_ratio**](api_full.md#set-ratio)