code.delx.au - pulseaudio/blob - polyp/resampler.h

   1 #ifndef fooresamplerhfoo
   2 #define fooresamplerhfoo
   3
   4 /* $Id$ */
   5
   6 /***
   7   This file is part of polypaudio.
   8
   9   polypaudio is free software; you can redistribute it and/or modify
  10   it under the terms of the GNU Lesser General Public License as published
  11   by the Free Software Foundation; either version 2 of the License,
  12   or (at your option) any later version.
  13
  14   polypaudio is distributed in the hope that it will be useful, but
  15   WITHOUT ANY WARRANTY; without even the implied warranty of
  16   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  17   General Public License for more details.
  18
  19   You should have received a copy of the GNU Lesser General Public License
  20   along with polypaudio; if not, write to the Free Software
  21   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  22   USA.
  23 ***/
  24
  25 #include <samplerate.h>
  26
  27 #include "sample.h"
  28 #include "memblock.h"
  29 #include "memchunk.h"
  30
  31 struct pa_resampler;
  32
  33 enum pa_resample_method {
  34     PA_RESAMPLER_INVALID                 = -1,
  35     PA_RESAMPLER_SRC_SINC_BEST_QUALITY   = SRC_SINC_BEST_QUALITY,
  36     PA_RESAMPLER_SRC_SINC_MEDIUM_QUALITY = SRC_SINC_MEDIUM_QUALITY,
  37     PA_RESAMPLER_SRC_SINC_FASTEST        = SRC_SINC_FASTEST,
  38     PA_RESAMPLER_SRC_ZERO_ORDER_HOLD     = SRC_ZERO_ORDER_HOLD,
  39     PA_RESAMPLER_SRC_LINEAR              = SRC_LINEAR,
  40     PA_RESAMPLER_TRIVIAL,
  41     PA_RESAMPLER_MAX
  42 };
  43
  44 struct pa_resampler* pa_resampler_new(const struct pa_sample_spec *a, const struct pa_sample_spec *b, struct pa_memblock_stat *s, int resample_method);
  45 void pa_resampler_free(struct pa_resampler *r);
  46
  47 /* Returns the size of an input memory block which is required to return the specified amount of output data */
  48 size_t pa_resampler_request(struct pa_resampler *r, size_t out_length);
  49
  50 /* Pass the specified memory chunk to the resampler and return the newly resampled data */
  51 void pa_resampler_run(struct pa_resampler *r, const struct pa_memchunk *in, struct pa_memchunk *out);
  52
  53 /* Change the input rate of the resampler object */
  54 void pa_resampler_set_input_rate(struct pa_resampler *r, uint32_t rate);
  55
  56 /* Return the resampling method of the resampler object */
  57 enum pa_resample_method pa_resampler_get_method(struct pa_resampler *r);
  58
  59 /* Try to parse the resampler method */
  60 enum pa_resample_method pa_parse_resample_method(const char *string);
  61
  62 /* return a human readable string for the specified resampling method. Inverse of pa_parse_resample_method() */
  63 const char *pa_resample_method_to_string(enum pa_resample_method m);
  64
  65 #endif