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Diffstat (limited to 'lib-x86-32/include/samplerate.h')
| -rw-r--r-- | lib-x86-32/include/samplerate.h | 197 |
1 files changed, 197 insertions, 0 deletions
diff --git a/lib-x86-32/include/samplerate.h b/lib-x86-32/include/samplerate.h new file mode 100644 index 00000000..9651e635 --- /dev/null +++ b/lib-x86-32/include/samplerate.h @@ -0,0 +1,197 @@ +/* +** Copyright (C) 2002-2008 Erik de Castro Lopo <erikd@mega-nerd.com> +** +** This program is free software; you can redistribute it and/or modify +** it under the terms of the GNU General Public License as published by +** the Free Software Foundation; either version 2 of the License, or +** (at your option) any later version. +** +** This program is distributed in the hope that it will be useful, +** but WITHOUT ANY WARRANTY; without even the implied warranty of +** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +** GNU General Public License for more details. +** +** You should have received a copy of the GNU General Public License +** along with this program; if not, write to the Free Software +** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA. +*/ + +/* +** This code is part of Secret Rabibt Code aka libsamplerate. A commercial +** use license for this code is available, please see: +** http://www.mega-nerd.com/SRC/procedure.html +*/ + +/* +** API documentation is available here: +** http://www.mega-nerd.com/SRC/api.html +*/ + +#ifndef SAMPLERATE_H +#define SAMPLERATE_H + +#ifdef __cplusplus +extern "C" { +#endif /* __cplusplus */ + + +/* Opaque data type SRC_STATE. */ +typedef struct SRC_STATE_tag SRC_STATE ; + +/* SRC_DATA is used to pass data to src_simple() and src_process(). */ +typedef struct +{ float *data_in, *data_out ; + + long input_frames, output_frames ; + long input_frames_used, output_frames_gen ; + + int end_of_input ; + + double src_ratio ; +} SRC_DATA ; + +/* SRC_CB_DATA is used with callback based API. */ +typedef struct +{ long frames ; + float *data_in ; +} SRC_CB_DATA ; + +/* +** User supplied callback function type for use with src_callback_new() +** and src_callback_read(). First parameter is the same pointer that was +** passed into src_callback_new(). Second parameter is pointer to a +** pointer. The user supplied callback function must modify *data to +** point to the start of the user supplied float array. The user supplied +** function must return the number of frames that **data points to. +*/ + +typedef long (*src_callback_t) (void *cb_data, float **data) ; + +/* +** Standard initialisation function : return an anonymous pointer to the +** internal state of the converter. Choose a converter from the enums below. +** Error returned in *error. +*/ + +SRC_STATE* src_new (int converter_type, int channels, int *error) ; + +/* +** Initilisation for callback based API : return an anonymous pointer to the +** internal state of the converter. Choose a converter from the enums below. +** The cb_data pointer can point to any data or be set to NULL. Whatever the +** value, when processing, user supplied function "func" gets called with +** cb_data as first parameter. +*/ + +SRC_STATE* src_callback_new (src_callback_t func, int converter_type, int channels, + int *error, void* cb_data) ; + +/* +** Cleanup all internal allocations. +** Always returns NULL. +*/ + +SRC_STATE* src_delete (SRC_STATE *state) ; + +/* +** Standard processing function. +** Returns non zero on error. +*/ + +int src_process (SRC_STATE *state, SRC_DATA *data) ; + +/* +** Callback based processing function. Read up to frames worth of data from +** the converter int *data and return frames read or -1 on error. +*/ +long src_callback_read (SRC_STATE *state, double src_ratio, long frames, float *data) ; + +/* +** Simple interface for performing a single conversion from input buffer to +** output buffer at a fixed conversion ratio. +** Simple interface does not require initialisation as it can only operate on +** a single buffer worth of audio. +*/ + +int src_simple (SRC_DATA *data, int converter_type, int channels) ; + +/* +** This library contains a number of different sample rate converters, +** numbered 0 through N. +** +** Return a string giving either a name or a more full description of each +** sample rate converter or NULL if no sample rate converter exists for +** the given value. The converters are sequentially numbered from 0 to N. +*/ + +const char *src_get_name (int converter_type) ; +const char *src_get_description (int converter_type) ; +const char *src_get_version (void) ; + +/* +** Set a new SRC ratio. This allows step responses +** in the conversion ratio. +** Returns non zero on error. +*/ + +int src_set_ratio (SRC_STATE *state, double new_ratio) ; + +/* +** Reset the internal SRC state. +** Does not modify the quality settings. +** Does not free any memory allocations. +** Returns non zero on error. +*/ + +int src_reset (SRC_STATE *state) ; + +/* +** Return TRUE if ratio is a valid conversion ratio, FALSE +** otherwise. +*/ + +int src_is_valid_ratio (double ratio) ; + +/* +** Return an error number. +*/ + +int src_error (SRC_STATE *state) ; + +/* +** Convert the error number into a string. +*/ +const char* src_strerror (int error) ; + +/* +** The following enums can be used to set the interpolator type +** using the function src_set_converter(). +*/ + +enum +{ + SRC_SINC_BEST_QUALITY = 0, + SRC_SINC_MEDIUM_QUALITY = 1, + SRC_SINC_FASTEST = 2, + SRC_ZERO_ORDER_HOLD = 3, + SRC_LINEAR = 4, +} ; + +/* +** Extra helper functions for converting from short to float and +** back again. +*/ + +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) ; + + +#ifdef __cplusplus +} /* extern "C" */ +#endif /* __cplusplus */ + +#endif /* SAMPLERATE_H */ + |