| /* |
| SDL - Simple DirectMedia Layer |
| Copyright (C) 1997-2012 Sam Lantinga |
| |
| This library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Library General Public |
| License as published by the Free Software Foundation; either |
| version 2 of the License, or (at your option) any later version. |
| |
| This library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Library General Public License for more details. |
| |
| You should have received a copy of the GNU Library General Public |
| License along with this library; if not, write to the Free |
| Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| |
| Sam Lantinga |
| slouken@libsdl.org |
| */ |
| #include "SDL_config.h" |
| |
| /* |
| * Driver for native OpenBSD/NetBSD audio(4). |
| * vedge@vedge.com.ar. |
| */ |
| |
| #include <errno.h> |
| #include <unistd.h> |
| #include <fcntl.h> |
| #include <sys/time.h> |
| #include <sys/ioctl.h> |
| #include <sys/stat.h> |
| #include <sys/types.h> |
| #include <sys/audioio.h> |
| |
| #include "SDL_timer.h" |
| #include "SDL_audio.h" |
| #include "../SDL_audiomem.h" |
| #include "../SDL_audio_c.h" |
| #include "../SDL_audiodev_c.h" |
| #include "SDL_bsdaudio.h" |
| |
| /* The tag name used by NetBSD/OpenBSD audio */ |
| #ifdef __NetBSD__ |
| #define BSD_AUDIO_DRIVER_NAME "netbsd" |
| #define BSD_AUDIO_DRIVER_DESC "Native NetBSD audio" |
| #else |
| #define BSD_AUDIO_DRIVER_NAME "openbsd" |
| #define BSD_AUDIO_DRIVER_DESC "Native OpenBSD audio" |
| #endif |
| |
| /* Open the audio device for playback, and don't block if busy */ |
| /* #define USE_BLOCKING_WRITES */ |
| |
| /* Use timer for synchronization */ |
| /* #define USE_TIMER_SYNC */ |
| |
| /* #define DEBUG_AUDIO */ |
| /* #define DEBUG_AUDIO_STREAM */ |
| |
| #ifdef USE_BLOCKING_WRITES |
| #define OPEN_FLAGS O_WRONLY |
| #else |
| #define OPEN_FLAGS (O_WRONLY|O_NONBLOCK) |
| #endif |
| |
| /* Audio driver functions */ |
| static void OBSD_WaitAudio(_THIS); |
| static int OBSD_OpenAudio(_THIS, SDL_AudioSpec *spec); |
| static void OBSD_PlayAudio(_THIS); |
| static Uint8 *OBSD_GetAudioBuf(_THIS); |
| static void OBSD_CloseAudio(_THIS); |
| |
| #ifdef DEBUG_AUDIO |
| static void OBSD_Status(_THIS); |
| #endif |
| |
| /* Audio driver bootstrap functions */ |
| |
| static int |
| Audio_Available(void) |
| { |
| int fd; |
| int available; |
| |
| available = 0; |
| fd = SDL_OpenAudioPath(NULL, 0, OPEN_FLAGS, 0); |
| if(fd >= 0) { |
| available = 1; |
| close(fd); |
| } |
| return(available); |
| } |
| |
| static void |
| Audio_DeleteDevice(SDL_AudioDevice *device) |
| { |
| SDL_free(device->hidden); |
| SDL_free(device); |
| } |
| |
| static SDL_AudioDevice |
| *Audio_CreateDevice(int devindex) |
| { |
| SDL_AudioDevice *this; |
| |
| /* Initialize all variables that we clean on shutdown */ |
| this = (SDL_AudioDevice*)SDL_malloc(sizeof(SDL_AudioDevice)); |
| if(this) { |
| SDL_memset(this, 0, (sizeof *this)); |
| this->hidden = |
| (struct SDL_PrivateAudioData*)SDL_malloc((sizeof *this->hidden)); |
| } |
| if((this == NULL) || (this->hidden == NULL)) { |
| SDL_OutOfMemory(); |
| if(this) SDL_free(this); |
| return(0); |
| } |
| SDL_memset(this->hidden, 0, (sizeof *this->hidden)); |
| audio_fd = -1; |
| |
| /* Set the function pointers */ |
| this->OpenAudio = OBSD_OpenAudio; |
| this->WaitAudio = OBSD_WaitAudio; |
| this->PlayAudio = OBSD_PlayAudio; |
| this->GetAudioBuf = OBSD_GetAudioBuf; |
| this->CloseAudio = OBSD_CloseAudio; |
| |
| this->free = Audio_DeleteDevice; |
| |
| return this; |
| } |
| |
| AudioBootStrap BSD_AUDIO_bootstrap = { |
| BSD_AUDIO_DRIVER_NAME, BSD_AUDIO_DRIVER_DESC, |
| Audio_Available, Audio_CreateDevice |
| }; |
| |
| /* This function waits until it is possible to write a full sound buffer */ |
| static void |
| OBSD_WaitAudio(_THIS) |
| { |
| #ifndef USE_BLOCKING_WRITES /* Not necessary when using blocking writes */ |
| /* See if we need to use timed audio synchronization */ |
| if ( frame_ticks ) { |
| /* Use timer for general audio synchronization */ |
| Sint32 ticks; |
| |
| ticks = ((Sint32)(next_frame - SDL_GetTicks()))-FUDGE_TICKS; |
| if ( ticks > 0 ) { |
| SDL_Delay(ticks); |
| } |
| } else { |
| /* Use select() for audio synchronization */ |
| fd_set fdset; |
| struct timeval timeout; |
| |
| FD_ZERO(&fdset); |
| FD_SET(audio_fd, &fdset); |
| timeout.tv_sec = 10; |
| timeout.tv_usec = 0; |
| #ifdef DEBUG_AUDIO |
| fprintf(stderr, "Waiting for audio to get ready\n"); |
| #endif |
| if ( select(audio_fd+1, NULL, &fdset, NULL, &timeout) <= 0 ) { |
| const char *message = |
| "Audio timeout - buggy audio driver? (disabled)"; |
| /* In general we should never print to the screen, |
| but in this case we have no other way of letting |
| the user know what happened. |
| */ |
| fprintf(stderr, "SDL: %s\n", message); |
| this->enabled = 0; |
| /* Don't try to close - may hang */ |
| audio_fd = -1; |
| #ifdef DEBUG_AUDIO |
| fprintf(stderr, "Done disabling audio\n"); |
| #endif |
| } |
| #ifdef DEBUG_AUDIO |
| fprintf(stderr, "Ready!\n"); |
| #endif |
| } |
| #endif /* !USE_BLOCKING_WRITES */ |
| } |
| |
| static void |
| OBSD_PlayAudio(_THIS) |
| { |
| int written, p=0; |
| |
| /* Write the audio data, checking for EAGAIN on broken audio drivers */ |
| do { |
| written = write(audio_fd, &mixbuf[p], mixlen-p); |
| if (written>0) |
| p += written; |
| if (written == -1 && errno != 0 && errno != EAGAIN && errno != EINTR) |
| { |
| /* Non recoverable error has occurred. It should be reported!!! */ |
| perror("audio"); |
| break; |
| } |
| |
| if ( p < written || ((written < 0) && ((errno == 0) || (errno == EAGAIN))) ) { |
| SDL_Delay(1); /* Let a little CPU time go by */ |
| } |
| } while ( p < written ); |
| |
| /* If timer synchronization is enabled, set the next write frame */ |
| if ( frame_ticks ) { |
| next_frame += frame_ticks; |
| } |
| |
| /* If we couldn't write, assume fatal error for now */ |
| if ( written < 0 ) { |
| this->enabled = 0; |
| } |
| #ifdef DEBUG_AUDIO |
| fprintf(stderr, "Wrote %d bytes of audio data\n", written); |
| #endif |
| } |
| |
| static Uint8 |
| *OBSD_GetAudioBuf(_THIS) |
| { |
| return(mixbuf); |
| } |
| |
| static void |
| OBSD_CloseAudio(_THIS) |
| { |
| if(mixbuf != NULL) { |
| SDL_FreeAudioMem(mixbuf); |
| mixbuf = NULL; |
| } |
| if(audio_fd >= 0) { |
| close(audio_fd); |
| audio_fd = -1; |
| } |
| } |
| |
| #ifdef DEBUG_AUDIO |
| void |
| OBSD_Status(_THIS) |
| { |
| audio_info_t info; |
| |
| if(ioctl(audio_fd, AUDIO_GETINFO, &info) < 0) { |
| fprintf(stderr,"AUDIO_GETINFO failed.\n"); |
| return; |
| } |
| |
| fprintf(stderr,"\n" |
| "[play/record info]\n" |
| "buffer size : %d bytes\n" |
| "sample rate : %i Hz\n" |
| "channels : %i\n" |
| "precision : %i-bit\n" |
| "encoding : 0x%x\n" |
| "seek : %i\n" |
| "sample count : %i\n" |
| "EOF count : %i\n" |
| "paused : %s\n" |
| "error occured : %s\n" |
| "waiting : %s\n" |
| "active : %s\n" |
| "", |
| info.play.buffer_size, |
| info.play.sample_rate, |
| info.play.channels, |
| info.play.precision, |
| info.play.encoding, |
| info.play.seek, |
| info.play.samples, |
| info.play.eof, |
| info.play.pause ? "yes" : "no", |
| info.play.error ? "yes" : "no", |
| info.play.waiting ? "yes" : "no", |
| info.play.active ? "yes": "no"); |
| |
| fprintf(stderr,"\n" |
| "[audio info]\n" |
| "monitor_gain : %i\n" |
| "hw block size : %d bytes\n" |
| "hi watermark : %i\n" |
| "lo watermark : %i\n" |
| "audio mode : %s\n" |
| "", |
| info.monitor_gain, |
| info.blocksize, |
| info.hiwat, info.lowat, |
| (info.mode == AUMODE_PLAY) ? "PLAY" |
| : (info.mode = AUMODE_RECORD) ? "RECORD" |
| : (info.mode == AUMODE_PLAY_ALL ? "PLAY_ALL" |
| : "?")); |
| } |
| #endif /* DEBUG_AUDIO */ |
| |
| static int |
| OBSD_OpenAudio(_THIS, SDL_AudioSpec *spec) |
| { |
| char audiodev[64]; |
| Uint16 format; |
| audio_info_t info; |
| |
| AUDIO_INITINFO(&info); |
| |
| /* Calculate the final parameters for this audio specification */ |
| SDL_CalculateAudioSpec(spec); |
| |
| #ifdef USE_TIMER_SYNC |
| frame_ticks = 0.0; |
| #endif |
| |
| /* Open the audio device */ |
| audio_fd = SDL_OpenAudioPath(audiodev, sizeof(audiodev), OPEN_FLAGS, 0); |
| if(audio_fd < 0) { |
| SDL_SetError("Couldn't open %s: %s", audiodev, strerror(errno)); |
| return(-1); |
| } |
| |
| /* Set to play mode */ |
| info.mode = AUMODE_PLAY; |
| if(ioctl(audio_fd, AUDIO_SETINFO, &info) < 0) { |
| SDL_SetError("Couldn't put device into play mode"); |
| return(-1); |
| } |
| |
| mixbuf = NULL; |
| AUDIO_INITINFO(&info); |
| for (format = SDL_FirstAudioFormat(spec->format); |
| format; format = SDL_NextAudioFormat()) |
| { |
| switch(format) { |
| case AUDIO_U8: |
| info.play.encoding = AUDIO_ENCODING_ULINEAR; |
| info.play.precision = 8; |
| break; |
| case AUDIO_S8: |
| info.play.encoding = AUDIO_ENCODING_SLINEAR; |
| info.play.precision = 8; |
| break; |
| case AUDIO_S16LSB: |
| info.play.encoding = AUDIO_ENCODING_SLINEAR_LE; |
| info.play.precision = 16; |
| break; |
| case AUDIO_S16MSB: |
| info.play.encoding = AUDIO_ENCODING_SLINEAR_BE; |
| info.play.precision = 16; |
| break; |
| case AUDIO_U16LSB: |
| info.play.encoding = AUDIO_ENCODING_ULINEAR_LE; |
| info.play.precision = 16; |
| break; |
| case AUDIO_U16MSB: |
| info.play.encoding = AUDIO_ENCODING_ULINEAR_BE; |
| info.play.precision = 16; |
| break; |
| default: |
| continue; |
| } |
| if (ioctl(audio_fd, AUDIO_SETINFO, &info) == 0) |
| break; |
| } |
| |
| if(!format) { |
| SDL_SetError("No supported encoding for 0x%x", spec->format); |
| return(-1); |
| } |
| |
| spec->format = format; |
| |
| AUDIO_INITINFO(&info); |
| info.play.channels = spec->channels; |
| if (ioctl(audio_fd, AUDIO_SETINFO, &info) == -1) |
| spec->channels = 1; |
| AUDIO_INITINFO(&info); |
| info.play.sample_rate = spec->freq; |
| info.blocksize = spec->size; |
| info.hiwat = 5; |
| info.lowat = 3; |
| (void)ioctl(audio_fd, AUDIO_SETINFO, &info); |
| (void)ioctl(audio_fd, AUDIO_GETINFO, &info); |
| spec->freq = info.play.sample_rate; |
| /* Allocate mixing buffer */ |
| mixlen = spec->size; |
| mixbuf = (Uint8*)SDL_AllocAudioMem(mixlen); |
| if(mixbuf == NULL) { |
| return(-1); |
| } |
| SDL_memset(mixbuf, spec->silence, spec->size); |
| |
| /* Get the parent process id (we're the parent of the audio thread) */ |
| parent = getpid(); |
| |
| #ifdef DEBUG_AUDIO |
| OBSD_Status(this); |
| #endif |
| |
| /* We're ready to rock and roll. :-) */ |
| return(0); |
| } |