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comparison src/audio/dsp/SDL_dspaudio.c @ 96:799bea5504e2

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Fixed blocking open bug when using blocking audio writes
author Sam Lantinga <slouken@lokigames.com>
date Mon, 09 Jul 2001 15:46:41 +0000
parents ae6e6b73333f
children c7bcdece4845
comparison
equal deleted inserted replaced
95:d84a06e0c358 96:799bea5504e2
56 /* The tag name used by DSP audio */ 56 /* The tag name used by DSP audio */
57 #define DSP_DRIVER_NAME "dsp" 57 #define DSP_DRIVER_NAME "dsp"
58 58
59 /* Open the audio device for playback, and don't block if busy */ 59 /* Open the audio device for playback, and don't block if busy */
60 #define USE_BLOCKING_WRITES 60 #define USE_BLOCKING_WRITES
61 #ifdef USE_BLOCKING_WRITES
62 #define OPEN_FLAGS O_WRONLY
63 #else
64 #define OPEN_FLAGS (O_WRONLY|O_NONBLOCK) 61 #define OPEN_FLAGS (O_WRONLY|O_NONBLOCK)
65 #endif
66 62
67 /* Audio driver functions */ 63 /* Audio driver functions */
68 static int DSP_OpenAudio(_THIS, SDL_AudioSpec *spec); 64 static int DSP_OpenAudio(_THIS, SDL_AudioSpec *spec);
69 static void DSP_WaitAudio(_THIS); 65 static void DSP_WaitAudio(_THIS);
70 static void DSP_PlayAudio(_THIS); 66 static void DSP_PlayAudio(_THIS);
337 SDL_SetError("Couldn't open %s: %s", audiodev, strerror(errno)); 333 SDL_SetError("Couldn't open %s: %s", audiodev, strerror(errno));
338 return(-1); 334 return(-1);
339 } 335 }
340 mixbuf = NULL; 336 mixbuf = NULL;
341 337
338 #ifdef USE_BLOCKING_WRITES
339 /* Make the file descriptor use blocking writes with fcntl() */
340 { long flags;
341 flags = fcntl(audio_fd, F_GETFL);
342 flags &= ~O_NONBLOCK;
343 if ( fcntl(audio_fd, F_SETFL, flags) < 0 ) {
344 SDL_SetError("Couldn't set audio blocking mode");
345 return(-1);
346 }
347 }
348 #endif
349
342 /* Get a list of supported hardware formats */ 350 /* Get a list of supported hardware formats */
343 if ( ioctl(audio_fd, SNDCTL_DSP_GETFMTS, &value) < 0 ) { 351 if ( ioctl(audio_fd, SNDCTL_DSP_GETFMTS, &value) < 0 ) {
344 SDL_SetError("Couldn't get audio format list"); 352 SDL_SetError("Couldn't get audio format list");
345 return(-1); 353 return(-1);
346 } 354 }