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FORK: Simple Directmedia Layer
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SDL_audio_c.h (3074B)

      1 /*
      2   Simple DirectMedia Layer
      3   Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
      4 
      5   This software is provided 'as-is', without any express or implied
      6   warranty.  In no event will the authors be held liable for any damages
      7   arising from the use of this software.
      8 
      9   Permission is granted to anyone to use this software for any purpose,
     10   including commercial applications, and to alter it and redistribute it
     11   freely, subject to the following restrictions:
     12 
     13   1. The origin of this software must not be misrepresented; you must not
     14      claim that you wrote the original software. If you use this software
     15      in a product, an acknowledgment in the product documentation would be
     16      appreciated but is not required.
     17   2. Altered source versions must be plainly marked as such, and must not be
     18      misrepresented as being the original software.
     19   3. This notice may not be removed or altered from any source distribution.
     20 */
     21 
     22 #ifndef SDL_audio_c_h_
     23 #define SDL_audio_c_h_
     24 
     25 #include "../SDL_internal.h"
     26 
     27 #ifndef DEBUG_CONVERT
     28 #define DEBUG_CONVERT 0
     29 #endif
     30 
     31 #if DEBUG_CONVERT
     32 #define LOG_DEBUG_CONVERT(from, to) fprintf(stderr, "Converting %s to %s.\n", from, to);
     33 #else
     34 #define LOG_DEBUG_CONVERT(from, to)
     35 #endif
     36 
     37 /* Functions and variables exported from SDL_audio.c for SDL_sysaudio.c */
     38 
     39 #ifdef HAVE_LIBSAMPLERATE_H
     40 #include "samplerate.h"
     41 extern SDL_bool SRC_available;
     42 extern int SRC_converter;
     43 extern SRC_STATE* (*SRC_src_new)(int converter_type, int channels, int *error);
     44 extern int (*SRC_src_process)(SRC_STATE *state, SRC_DATA *data);
     45 extern int (*SRC_src_reset)(SRC_STATE *state);
     46 extern SRC_STATE* (*SRC_src_delete)(SRC_STATE *state);
     47 extern const char* (*SRC_src_strerror)(int error);
     48 #endif
     49 
     50 /* Functions to get a list of "close" audio formats */
     51 extern SDL_AudioFormat SDL_FirstAudioFormat(SDL_AudioFormat format);
     52 extern SDL_AudioFormat SDL_NextAudioFormat(void);
     53 
     54 /* Function to calculate the size and silence for a SDL_AudioSpec */
     55 extern Uint8 SDL_SilenceValueForFormat(const SDL_AudioFormat format);
     56 extern void SDL_CalculateAudioSpec(SDL_AudioSpec * spec);
     57 
     58 /* Choose the audio filter functions below */
     59 extern void SDL_ChooseAudioConverters(void);
     60 
     61 /* These pointers get set during SDL_ChooseAudioConverters() to various SIMD implementations. */
     62 extern SDL_AudioFilter SDL_Convert_S8_to_F32;
     63 extern SDL_AudioFilter SDL_Convert_U8_to_F32;
     64 extern SDL_AudioFilter SDL_Convert_S16_to_F32;
     65 extern SDL_AudioFilter SDL_Convert_U16_to_F32;
     66 extern SDL_AudioFilter SDL_Convert_S32_to_F32;
     67 extern SDL_AudioFilter SDL_Convert_F32_to_S8;
     68 extern SDL_AudioFilter SDL_Convert_F32_to_U8;
     69 extern SDL_AudioFilter SDL_Convert_F32_to_S16;
     70 extern SDL_AudioFilter SDL_Convert_F32_to_U16;
     71 extern SDL_AudioFilter SDL_Convert_F32_to_S32;
     72 
     73 /* You need to call SDL_PrepareResampleFilter() before using the internal resampler.
     74    SDL_AudioQuit() calls SDL_FreeResamplerFilter(), you should never call it yourself. */
     75 extern int SDL_PrepareResampleFilter(void);
     76 extern void SDL_FreeResampleFilter(void);
     77 
     78 #endif /* SDL_audio_c_h_ */
     79 
     80 /* vi: set ts=4 sw=4 expandtab: */