1 /* 2 SDL - Simple DirectMedia Layer 3 Copyright (C) 1997-2006 Sam Lantinga 4 5 This library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public 7 License as published by the Free Software Foundation; either 8 version 2.1 of the License, or (at your option) any later version. 9 10 This library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with this library; if not, write to the Free Software 17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 18 19 Sam Lantinga 20 slouken (at) libsdl.org 21 */ 22 #include "SDL_config.h" 23 24 #ifndef _SDL_dspaudio_h 25 #define _SDL_dspaudio_h 26 27 #include "../SDL_sysaudio.h" 28 29 /* Hidden "this" pointer for the video functions */ 30 #define _THIS SDL_AudioDevice *this 31 32 struct SDL_PrivateAudioData { 33 /* The file descriptor for the audio device */ 34 int audio_fd; 35 36 /* The parent process id, to detect when application quits */ 37 pid_t parent; 38 39 /* Raw mixing buffer */ 40 Uint8 *dma_buf; 41 int dma_len; 42 int num_buffers; 43 44 /* Support for audio timing using a timer, in addition to select() */ 45 float frame_ticks; 46 float next_frame; 47 }; 48 #define FUDGE_TICKS 10 /* The scheduler overhead ticks per frame */ 49 50 /* Old variable names */ 51 #define audio_fd (this->hidden->audio_fd) 52 #define parent (this->hidden->parent) 53 #define dma_buf (this->hidden->dma_buf) 54 #define dma_len (this->hidden->dma_len) 55 #define num_buffers (this->hidden->num_buffers) 56 #define frame_ticks (this->hidden->frame_ticks) 57 #define next_frame (this->hidden->next_frame) 58 59 #endif /* _SDL_dspaudio_h */ 60
