code.delx.au - pulseaudio/blob - src/pulsecore/resampler.h

   1 #ifndef fooresamplerhfoo
   2 #define fooresamplerhfoo
   3
   4 /* $Id$ */
   5
   6 /***
   7   This file is part of PulseAudio.
   8
   9   Copyright 2004-2006 Lennart Poettering
  10
  11   PulseAudio is free software; you can redistribute it and/or modify
  12   it under the terms of the GNU Lesser General Public License as published
  13   by the Free Software Foundation; either version 2 of the License,
  14   or (at your option) any later version.
  15
  16   PulseAudio is distributed in the hope that it will be useful, but
  17   WITHOUT ANY WARRANTY; without even the implied warranty of
  18   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  19   General Public License for more details.
  20
  21   You should have received a copy of the GNU Lesser General Public License
  22   along with PulseAudio; if not, write to the Free Software
  23   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  24   USA.
  25 ***/
  26
  27 #include <samplerate.h>
  28
  29 #include <pulse/sample.h>
  30 #include <pulse/channelmap.h>
  31 #include <pulsecore/memblock.h>
  32 #include <pulsecore/memchunk.h>
  33
  34 typedef struct pa_resampler pa_resampler;
  35
  36 typedef enum pa_resample_method {
  37     PA_RESAMPLER_INVALID                 = -1,
  38     PA_RESAMPLER_SRC_SINC_BEST_QUALITY   = SRC_SINC_BEST_QUALITY,
  39     PA_RESAMPLER_SRC_SINC_MEDIUM_QUALITY = SRC_SINC_MEDIUM_QUALITY,
  40     PA_RESAMPLER_SRC_SINC_FASTEST        = SRC_SINC_FASTEST,
  41     PA_RESAMPLER_SRC_ZERO_ORDER_HOLD     = SRC_ZERO_ORDER_HOLD,
  42     PA_RESAMPLER_SRC_LINEAR              = SRC_LINEAR,
  43     PA_RESAMPLER_TRIVIAL,
  44     PA_RESAMPLER_MAX
  45 } pa_resample_method_t;
  46
  47 pa_resampler* pa_resampler_new(
  48         pa_mempool *pool,
  49         const pa_sample_spec *a,
  50         const pa_channel_map *am,
  51         const pa_sample_spec *b,
  52         const pa_channel_map *bm,
  53         pa_resample_method_t resample_method);
  54
  55 void pa_resampler_free(pa_resampler *r);
  56
  57 /* Returns the size of an input memory block which is required to return the specified amount of output data */
  58 size_t pa_resampler_request(pa_resampler *r, size_t out_length);
  59
  60 /* Pass the specified memory chunk to the resampler and return the newly resampled data */
  61 void pa_resampler_run(pa_resampler *r, const pa_memchunk *in, pa_memchunk *out);
  62
  63 /* Change the input rate of the resampler object */
  64 void pa_resampler_set_input_rate(pa_resampler *r, uint32_t rate);
  65
  66 /* Return the resampling method of the resampler object */
  67 pa_resample_method_t pa_resampler_get_method(pa_resampler *r);
  68
  69 /* Try to parse the resampler method */
  70 pa_resample_method_t pa_parse_resample_method(const char *string);
  71
  72 /* return a human readable string for the specified resampling method. Inverse of pa_parse_resample_method() */
  73 const char *pa_resample_method_to_string(pa_resample_method_t m);
  74
  75 #endif