code.delx.au - pulseaudio/blob - src/polypcore/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 <polyp/sample.h>
  28 #include <polyp/channelmap.h>
  29 #include <polypcore/memblock.h>
  30 #include <polypcore/memchunk.h>
  31
  32 typedef struct pa_resampler pa_resampler;
  33
  34 typedef enum pa_resample_method {
  35     PA_RESAMPLER_INVALID                 = -1,
  36     PA_RESAMPLER_SRC_SINC_BEST_QUALITY   = SRC_SINC_BEST_QUALITY,
  37     PA_RESAMPLER_SRC_SINC_MEDIUM_QUALITY = SRC_SINC_MEDIUM_QUALITY,
  38     PA_RESAMPLER_SRC_SINC_FASTEST        = SRC_SINC_FASTEST,
  39     PA_RESAMPLER_SRC_ZERO_ORDER_HOLD     = SRC_ZERO_ORDER_HOLD,
  40     PA_RESAMPLER_SRC_LINEAR              = SRC_LINEAR,
  41     PA_RESAMPLER_TRIVIAL,
  42     PA_RESAMPLER_MAX
  43 } pa_resample_method_t;
  44
  45 pa_resampler* pa_resampler_new(
  46     const pa_sample_spec *a,
  47     const pa_channel_map *am,
  48     const pa_sample_spec *b,
  49     const pa_channel_map *bm,
  50     pa_memblock_stat *s,
  51     pa_resample_method_t resample_method);
  52
  53 void pa_resampler_free(pa_resampler *r);
  54
  55 /* Returns the size of an input memory block which is required to return the specified amount of output data */
  56 size_t pa_resampler_request(pa_resampler *r, size_t out_length);
  57
  58 /* Pass the specified memory chunk to the resampler and return the newly resampled data */
  59 void pa_resampler_run(pa_resampler *r, const pa_memchunk *in, pa_memchunk *out);
  60
  61 /* Change the input rate of the resampler object */
  62 void pa_resampler_set_input_rate(pa_resampler *r, uint32_t rate);
  63
  64 /* Return the resampling method of the resampler object */
  65 pa_resample_method_t pa_resampler_get_method(pa_resampler *r);
  66
  67 /* Try to parse the resampler method */
  68 pa_resample_method_t pa_parse_resample_method(const char *string);
  69
  70 /* return a human readable string for the specified resampling method. Inverse of pa_parse_resample_method() */
  71 const char *pa_resample_method_to_string(pa_resample_method_t m);
  72
  73 #endif