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comparison src/audio/dsp/SDL_dspaudio.h @ 968:4675910b0b7b

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Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST) From: Hannu Savolainen Subject: Re: SDL uses obsolete OSS features I did some work on getting OSS to work better with SDL. There have been some problems with select which should be fixed now. I'm having some problems in understanding what is the purpose of the DSP_WaitAudio() routine. I added a return to the very beginning of this routine and commendted out the define for USE_BLOCKING_WRITES. At least lbreakout2 seems to work as well as earlier. The latencies are the same. An ordinary blocking write does exactly the same thing than DSP_WaitAudio does. So I would recommend using the USE_BLOCKING_WRITES approach and removing everything from the DSP_WaitAudio routine. Also enabling USE_BLOCKING_WRITES makes it possible to simplify DSP_PlayAudio() because you don't need to handle the partial writes (the do-while loop). Attached is a patch against SDL-1.2.7. After these changes SDL will use OSS as it's designed to be used (make it as simple as possible). This code should work with all OSS implementations because it uses only the very fundamental features that have been there since the jurassic times.
author Sam Lantinga <slouken@libsdl.org>
date Fri, 12 Nov 2004 21:39:04 +0000
parents b8d311d90021
children c9b51268668f
comparison
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967:cda407d627a3 968:4675910b0b7b
41 pid_t parent; 41 pid_t parent;
42 42
43 /* Raw mixing buffer */ 43 /* Raw mixing buffer */
44 Uint8 *mixbuf; 44 Uint8 *mixbuf;
45 int mixlen; 45 int mixlen;
46
47 /* Support for audio timing using a timer, in addition to select() */
48 float frame_ticks;
49 float next_frame;
50 }; 46 };
51 #define FUDGE_TICKS 10 /* The scheduler overhead ticks per frame */ 47 #define FUDGE_TICKS 10 /* The scheduler overhead ticks per frame */
52 48
53 /* Old variable names */ 49 /* Old variable names */
54 #define audio_fd (this->hidden->audio_fd) 50 #define audio_fd (this->hidden->audio_fd)