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----
-layout: default
----
-
-# Miscellaneous API Documentation
-
-## Error Reporting
-
-Most of the API functions either return an integer error (ie **src_simple** and
-**src_process**) or return an integer error value via an int pointer parameter
-(**src_new**). These integer error values can be converted into human-readable
-text strings by calling the function:
-
-```c
-const char* src_strerror (int error) ;
-```
-
-which will return an error string for valid error numbers, the string
-\"No Error\" for an error value of zero or a NULL pointer if no error message
-has been defined for that error value.
-
-## Converters
-
-Secret Rabbit Code has a number of different converters which can be selected
-using the **converter_type** parameter when calling **src_simple** or
-**src_new**. Currently, the five converters available are:
-
-```c
-enum
-{
-    SRC_SINC_BEST_QUALITY       = 0,
-    SRC_SINC_MEDIUM_QUALITY     = 1,
-    SRC_SINC_FASTEST            = 2,
-    SRC_ZERO_ORDER_HOLD         = 3,
-    SRC_LINEAR                  = 4
-} ;
-```
-
-As new converters are added, they will be given a number corresponding to the next
-integer.
-
-The details of these converters are as follows:
-
-- **SRC_SINC_BEST_QUALITY** - This is a bandlimited interpolator derived from
-  the mathematical **sinc** function and this is the highest quality sinc based
-  converter, providing a worst case Signal-to-Noise Ratio (SNR) of 97 decibels
-  (dB) at a bandwidth of 97%. All three SRC_SINC_* converters are based on the
-  techniques of [Julius O. Smith](http://ccrma.stanford.edu/~jos/resample/)
-  although this code was developed independently.
-- **SRC_SINC_MEDIUM_QUALITY** - This is another bandlimited interpolator much
-  like the previous one. It has an SNR of 97dB and a bandwidth of 90%. The speed
-  of the conversion is much faster than the previous one.
-- **SRC_SINC_FASTEST** - This is the fastest bandlimited interpolator and has an
-  SNR of 97dB and a bandwidth of 80%.
-- **SRC_ZERO_ORDER_HOLD** - A Zero Order Hold converter (interpolated value is
-  equal to the last value). The quality is poor but the conversion speed is
-  blindlingly fast. Be aware that this interpolator is not bandlimited, and the 
-  user is responsible for adding anti-aliasing filtering. 
-- **SRC_LINEAR** - A linear converter. Again the quality is poor, but the
-  conversion speed is blindingly fast. This interpolator is also not bandlimited, 
-  and the user is responsible for adding anti-aliasing filtering.
-
-There are two functions that give either a (text string) name or description for
-each converter:
-
-```c
-const char *src_get_name (int converter_type) ;
-const char *src_get_description (int converter_type) ;
-```
-
-The name will typically be a short string for use in a dialog box, while the
-description string is longer.
-
-Both of these functions return a NULL pointer if there is no converter for the
-given **converter_type** value. Since the converters have consecutive
-**converter_type** values, the caller is easily able to figure out the number of
-converters at run time. This enables a binary dynamically linked against an old
-version of the library to know about converters from later versions of the
-library as they become available.
-
-## SRC_DATA
-
-Both the simple and the full featured versions of the API use the **SRC_DATA**
-struct to pass audio and control data into the sample rate converter. This
-struct is defined as:
-
-```c
-typedef struct
-{   const float  *data_in;
-    float *data_out ;
-
-    long   input_frames, output_frames ;
-    long   input_frames_used, output_frames_gen ;
-
-    int    end_of_input ;
-
-    double src_ratio ;
-} SRC_DATA ;
-```
-
-The **data_in** pointer is used to pass audio data into the converter while the
-**data_out** pointer supplies the converter with an array to hold the
-converter's output. For a converter which has been configured for multichannel
-operation, these pointers need to point to a single array of interleaved data.
-
-The **input_frames** and **output_frames** fields supply the converter with the
-lengths of the arrays (in frames) pointed to by the **data_in** and **data_out**
-pointers respectively. For monophonic data, these values would indicate the
-length of the arrays while for multi channel data these values would be equal to
-the length of the array divided by the number of channels.
-
-The **end_of_input** field is only used when the sample rate converter is used
-by calling the **src_process** function. In this case it should be set to zero
-if more buffers are to be passed to the converter and 1 if the current buffer is
-the last.
-
-Finally, the **src_ratio** field specifies the conversion ratio defined as the
-output sample rate divided by the input sample rate. For a connected set of
-buffers, this value can vary on each call to **src_process** resulting in a
-time varying sample rate conversion process. For time varying sample rate
-conversions, the ratio will be linearly interpolated between the **src_ratio**
-value of the previous call to **src_process** and the value for the current
-call.
-
-The **input_frames_used** and **output_frames_gen** fields are set by the
-converter to inform the caller of the number of frames consumed from the
-**data_in** array and the number of frames generated in the **data_out** array
-respectively. These values are for the current call to **src_process** only.
-
-## Auxiliary Functions
-
-There are four auxiliary functions for converting arrays of float data to and
-from short or int data. These functions are defined as:
-
-```c
-void src_short_to_float_array (const short *in, float *out, int len) ;
-void src_float_to_short_array (const float *in, short *out, int len) ;
-void src_int_to_float_array (const int *in, float *out, int len) ;
-void src_float_to_int_array (const float *in, int *out, int len) ;
-```
-
-The float data is assumed to be in the range [-1.0, 1.0] and it is automatically
-scaled on the conversion to and from float. On the float to short/int conversion
-path, any data values which would overflow the range of short/int data are
-clipped.