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

   1 #ifndef fooresamplerhfoo
   2 #define fooresamplerhfoo
   3
   4 /***
   5   This file is part of PulseAudio.
   6
   7   Copyright 2004-2006 Lennart Poettering
   8
   9   PulseAudio 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   PulseAudio 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 PulseAudio; 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 <pulse/sample.h>
  26 #include <pulse/channelmap.h>
  27 #include <pulsecore/memblock.h>
  28 #include <pulsecore/memchunk.h>
  29
  30 typedef struct pa_resampler pa_resampler;
  31
  32 typedef enum pa_resample_method {
  33     PA_RESAMPLER_INVALID                 = -1,
  34     PA_RESAMPLER_SRC_SINC_BEST_QUALITY   = 0, /* = SRC_SINC_BEST_QUALITY */
  35     PA_RESAMPLER_SRC_SINC_MEDIUM_QUALITY = 1, /* = SRC_SINC_MEDIUM_QUALITY */
  36     PA_RESAMPLER_SRC_SINC_FASTEST        = 2, /* = SRC_SINC_FASTEST */
  37     PA_RESAMPLER_SRC_ZERO_ORDER_HOLD     = 3, /* = SRC_ZERO_ORDER_HOLD */
  38     PA_RESAMPLER_SRC_LINEAR              = 4, /* = SRC_LINEAR */
  39     PA_RESAMPLER_TRIVIAL,
  40     PA_RESAMPLER_SPEEX_FLOAT_BASE,
  41     PA_RESAMPLER_SPEEX_FLOAT_MAX = PA_RESAMPLER_SPEEX_FLOAT_BASE + 10,
  42     PA_RESAMPLER_SPEEX_FIXED_BASE,
  43     PA_RESAMPLER_SPEEX_FIXED_MAX = PA_RESAMPLER_SPEEX_FIXED_BASE + 10,
  44     PA_RESAMPLER_FFMPEG,
  45     PA_RESAMPLER_AUTO, /* automatic select based on sample format */
  46     PA_RESAMPLER_COPY,
  47     PA_RESAMPLER_PEAKS,
  48     PA_RESAMPLER_MAX
  49 } pa_resample_method_t;
  50
  51 typedef enum pa_resample_flags {
  52     PA_RESAMPLER_VARIABLE_RATE = 1,
  53     PA_RESAMPLER_NO_REMAP = 2,  /* implies NO_REMIX */
  54     PA_RESAMPLER_NO_REMIX = 4
  55 } pa_resample_flags_t;
  56
  57 pa_resampler* pa_resampler_new(
  58         pa_mempool *pool,
  59         const pa_sample_spec *a,
  60         const pa_channel_map *am,
  61         const pa_sample_spec *b,
  62         const pa_channel_map *bm,
  63         pa_resample_method_t resample_method,
  64         pa_resample_flags_t flags);
  65
  66 void pa_resampler_free(pa_resampler *r);
  67
  68 /* Returns the size of an input memory block which is required to return the specified amount of output data */
  69 size_t pa_resampler_request(pa_resampler *r, size_t out_length);
  70
  71 /* Inverse of pa_resampler_request() */
  72 size_t pa_resampler_result(pa_resampler *r, size_t in_length);
  73
  74 /* Returns the maximum size of input blocks we can process without needing bounce buffers larger than the mempool tile size. */
  75 size_t pa_resampler_max_block_size(pa_resampler *r);
  76
  77 /* Pass the specified memory chunk to the resampler and return the newly resampled data */
  78 void pa_resampler_run(pa_resampler *r, const pa_memchunk *in, pa_memchunk *out);
  79
  80 /* Change the input rate of the resampler object */
  81 void pa_resampler_set_input_rate(pa_resampler *r, uint32_t rate);
  82
  83 /* Change the output rate of the resampler object */
  84 void pa_resampler_set_output_rate(pa_resampler *r, uint32_t rate);
  85
  86 /* Reinitialize state of the resampler, possibly due to seeking or other discontinuities */
  87 void pa_resampler_reset(pa_resampler *r);
  88
  89 /* Return the resampling method of the resampler object */
  90 pa_resample_method_t pa_resampler_get_method(pa_resampler *r);
  91
  92 /* Try to parse the resampler method */
  93 pa_resample_method_t pa_parse_resample_method(const char *string);
  94
  95 /* return a human readable string for the specified resampling method. Inverse of pa_parse_resample_method() */
  96 const char *pa_resample_method_to_string(pa_resample_method_t m);
  97
  98 /* Return 1 when the specified resampling method is supported */
  99 int pa_resample_method_supported(pa_resample_method_t m);
 100
 101
 102 #endif