| /* |
| Simple DirectMedia Layer |
| Copyright (C) 1997-2014 Sam Lantinga <slouken@libsdl.org> |
| |
| This software is provided 'as-is', without any express or implied |
| warranty. In no event will the authors be held liable for any damages |
| arising from the use of this software. |
| |
| Permission is granted to anyone to use this software for any purpose, |
| including commercial applications, and to alter it and redistribute it |
| freely, subject to the following restrictions: |
| |
| 1. The origin of this software must not be misrepresented; you must not |
| claim that you wrote the original software. If you use this software |
| in a product, an acknowledgment in the product documentation would be |
| appreciated but is not required. |
| 2. Altered source versions must be plainly marked as such, and must not be |
| misrepresented as being the original software. |
| 3. This notice may not be removed or altered from any source distribution. |
| */ |
| #include "../../SDL_internal.h" |
| |
| #if SDL_AUDIO_DRIVER_BSD |
| |
| /* |
| * 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" |
| |
| /* Use timer for synchronization */ |
| /* #define USE_TIMER_SYNC */ |
| |
| /* #define DEBUG_AUDIO */ |
| /* #define DEBUG_AUDIO_STREAM */ |
| |
| |
| static void |
| BSDAUDIO_DetectDevices(int iscapture, SDL_AddAudioDevice addfn) |
| { |
| SDL_EnumUnixAudioDevices(iscapture, 0, NULL, addfn); |
| } |
| |
| |
| static void |
| BSDAUDIO_Status(_THIS) |
| { |
| #ifdef DEBUG_AUDIO |
| /* *INDENT-OFF* */ |
| audio_info_t info; |
| |
| if (ioctl(this->hidden->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" : "?")); |
| /* *INDENT-ON* */ |
| #endif /* DEBUG_AUDIO */ |
| } |
| |
| |
| /* This function waits until it is possible to write a full sound buffer */ |
| static void |
| BSDAUDIO_WaitDevice(_THIS) |
| { |
| #ifndef USE_BLOCKING_WRITES /* Not necessary when using blocking writes */ |
| /* See if we need to use timed audio synchronization */ |
| if (this->hidden->frame_ticks) { |
| /* Use timer for general audio synchronization */ |
| Sint32 ticks; |
| |
| ticks = ((Sint32) (this->hidden->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(this->hidden->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(this->hidden->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 */ |
| this->hidden->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 |
| BSDAUDIO_PlayDevice(_THIS) |
| { |
| int written, p = 0; |
| |
| /* Write the audio data, checking for EAGAIN on broken audio drivers */ |
| do { |
| written = write(this->hidden->audio_fd, |
| &this->hidden->mixbuf[p], this->hidden->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 (this->hidden->frame_ticks) { |
| this->hidden->next_frame += this->hidden->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 * |
| BSDAUDIO_GetDeviceBuf(_THIS) |
| { |
| return (this->hidden->mixbuf); |
| } |
| |
| static void |
| BSDAUDIO_CloseDevice(_THIS) |
| { |
| if (this->hidden != NULL) { |
| SDL_FreeAudioMem(this->hidden->mixbuf); |
| this->hidden->mixbuf = NULL; |
| if (this->hidden->audio_fd >= 0) { |
| close(this->hidden->audio_fd); |
| this->hidden->audio_fd = -1; |
| } |
| SDL_free(this->hidden); |
| this->hidden = NULL; |
| } |
| } |
| |
| static int |
| BSDAUDIO_OpenDevice(_THIS, const char *devname, int iscapture) |
| { |
| const int flags = ((iscapture) ? OPEN_FLAGS_INPUT : OPEN_FLAGS_OUTPUT); |
| SDL_AudioFormat format = 0; |
| audio_info_t info; |
| |
| /* We don't care what the devname is...we'll try to open anything. */ |
| /* ...but default to first name in the list... */ |
| if (devname == NULL) { |
| devname = SDL_GetAudioDeviceName(0, iscapture); |
| if (devname == NULL) { |
| return SDL_SetError("No such audio device"); |
| } |
| } |
| |
| /* Initialize all variables that we clean on shutdown */ |
| this->hidden = (struct SDL_PrivateAudioData *) |
| SDL_malloc((sizeof *this->hidden)); |
| if (this->hidden == NULL) { |
| return SDL_OutOfMemory(); |
| } |
| SDL_memset(this->hidden, 0, (sizeof *this->hidden)); |
| |
| /* Open the audio device */ |
| this->hidden->audio_fd = open(devname, flags, 0); |
| if (this->hidden->audio_fd < 0) { |
| return SDL_SetError("Couldn't open %s: %s", devname, strerror(errno)); |
| } |
| |
| AUDIO_INITINFO(&info); |
| |
| /* Calculate the final parameters for this audio specification */ |
| SDL_CalculateAudioSpec(&this->spec); |
| |
| /* Set to play mode */ |
| info.mode = AUMODE_PLAY; |
| if (ioctl(this->hidden->audio_fd, AUDIO_SETINFO, &info) < 0) { |
| BSDAUDIO_CloseDevice(this); |
| return SDL_SetError("Couldn't put device into play mode"); |
| } |
| |
| AUDIO_INITINFO(&info); |
| for (format = SDL_FirstAudioFormat(this->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(this->hidden->audio_fd, AUDIO_SETINFO, &info) == 0) { |
| break; |
| } |
| } |
| |
| if (!format) { |
| BSDAUDIO_CloseDevice(this); |
| return SDL_SetError("No supported encoding for 0x%x", this->spec.format); |
| } |
| |
| this->spec.format = format; |
| |
| AUDIO_INITINFO(&info); |
| info.play.channels = this->spec.channels; |
| if (ioctl(this->hidden->audio_fd, AUDIO_SETINFO, &info) == -1) { |
| this->spec.channels = 1; |
| } |
| AUDIO_INITINFO(&info); |
| info.play.sample_rate = this->spec.freq; |
| info.blocksize = this->spec.size; |
| info.hiwat = 5; |
| info.lowat = 3; |
| (void) ioctl(this->hidden->audio_fd, AUDIO_SETINFO, &info); |
| (void) ioctl(this->hidden->audio_fd, AUDIO_GETINFO, &info); |
| this->spec.freq = info.play.sample_rate; |
| /* Allocate mixing buffer */ |
| this->hidden->mixlen = this->spec.size; |
| this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen); |
| if (this->hidden->mixbuf == NULL) { |
| BSDAUDIO_CloseDevice(this); |
| return SDL_OutOfMemory(); |
| } |
| SDL_memset(this->hidden->mixbuf, this->spec.silence, this->spec.size); |
| |
| BSDAUDIO_Status(this); |
| |
| /* We're ready to rock and roll. :-) */ |
| return 0; |
| } |
| |
| static int |
| BSDAUDIO_Init(SDL_AudioDriverImpl * impl) |
| { |
| /* Set the function pointers */ |
| impl->DetectDevices = BSDAUDIO_DetectDevices; |
| impl->OpenDevice = BSDAUDIO_OpenDevice; |
| impl->PlayDevice = BSDAUDIO_PlayDevice; |
| impl->WaitDevice = BSDAUDIO_WaitDevice; |
| impl->GetDeviceBuf = BSDAUDIO_GetDeviceBuf; |
| impl->CloseDevice = BSDAUDIO_CloseDevice; |
| |
| return 1; /* this audio target is available. */ |
| } |
| |
| |
| AudioBootStrap BSD_AUDIO_bootstrap = { |
| "bsd", "BSD audio", BSDAUDIO_Init, 0 |
| }; |
| |
| #endif /* SDL_AUDIO_DRIVER_BSD */ |
| |
| /* vi: set ts=4 sw=4 expandtab: */ |