src/add-ons/media/media-add-ons/opensound/SupportFunctions.h

   1 /*
   2  * Copyright 2008 Stephan Aßmus, <superstippi@gmx.de>
   3  * All rights reserved. Distributed under the terms of the MIT license.
   4  */
   5 #ifndef SUPPORT_FUNCTIONS_H
   6 #define SUPPORT_FUNCTIONS_H
   7
   8 #include <MediaDefs.h>
   9
  10 static inline int32
  11 bytes_per_frame(const media_format& format)
  12 {
  13         int32 channelCount = format.u.raw_audio.channel_count;
  14         size_t sampleSize = format.u.raw_audio.format
  15                         & media_raw_audio_format::B_AUDIO_SIZE_MASK;
  16         return sampleSize * channelCount;
  17 }
  18
  19
  20 static inline bigtime_t
  21 time_for_buffer(size_t size, const media_format& format)
  22 {
  23         int32 frameSize = bytes_per_frame(format);
  24         float frameRate = format.u.raw_audio.frame_rate;
  25
  26         return (bigtime_t)((double)size * 1000000 / frameSize / frameRate);
  27 }
  28
  29
  30 #endif // SUPPORT_FUNCTIONS_H