kc3-lang/SDL/src/audio/pipewire/SDL_pipewire.h

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• Hash : 53091e36
  Author :
  Date : 2022-02-02T12:30:34
  

  audio: pipewire: Remove the hard upper bound on rates and buffer sizes Remove the hard upper limit of 8192 samples and instead use the buffer sizes provided by Pipewire to determine the size of the intermediate input buffer and whether double buffering is required for output streams. This allows for higher latency streams to potentially avoid double-buffering in the output case, and we can guarantee that the intermediate input buffer will always be large enough to handle whatever Pipewire may deliver. As the buffer size calculations occur in a callback in the Pipewire processing thread itself, the stream readiness check has been modified to wait on two distinct flags set when the buffers have been configured and when the stream is ready and running.

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• src/audio/pipewire/SDL_pipewire.h

• /*
    Simple DirectMedia Layer
    Copyright (C) 1997-2022 Sam Lantinga <slouken@libsdl.org>
  
    This software is provided 'as-is', without any express or implied
    warranty.  In no event will the authors be held liable for any damages
    arising from the use of this software.
  
    Permission is granted to anyone to use this software for any purpose,
    including commercial applications, and to alter it and redistribute it
    freely, subject to the following restrictions:
  
    1. The origin of this software must not be misrepresented; you must not
       claim that you wrote the original software. If you use this software
       in a product, an acknowledgment in the product documentation would be
       appreciated but is not required.
    2. Altered source versions must be plainly marked as such, and must not be
       misrepresented as being the original software.
    3. This notice may not be removed or altered from any source distribution.
  */
  
  #include "../../SDL_internal.h"
  
  #ifndef SDL_pipewire_h_
  #define SDL_pipewire_h_
  
  #include "../SDL_sysaudio.h"
  #include <pipewire/pipewire.h>
  
  /* Hidden "this" pointer for the audio functions */
  #define _THIS SDL_AudioDevice *this
  
  struct SDL_PrivateAudioData
  {
      struct pw_thread_loop *loop;
      struct pw_stream      *stream;
      struct pw_context     *context;
      struct SDL_DataQueue  *buffer;
  
      size_t input_buffer_packet_size;
      Sint32 stride; /* Bytes-per-frame */
      int    stream_init_status;
  };
  
  #endif /* SDL_pipewire_h_ */
  
  /* vi: set ts=4 sw=4 expandtab: */
  

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