| /* |
| SDL - Simple DirectMedia Layer |
| Copyright (C) 1997-2006 Sam Lantinga |
| |
| This library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 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 |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with this library; if not, write to the Free Software |
| Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| |
| Carsten Griwodz |
| griff@kom.tu-darmstadt.de |
| |
| based on linux/SDL_dspaudio.c by Sam Lantinga |
| */ |
| #include "SDL_config.h" |
| |
| /* Allow access to a raw mixing buffer */ |
| |
| #include <errno.h> |
| #include <unistd.h> |
| #include <fcntl.h> |
| #include <sys/time.h> |
| #include <sys/ioctl.h> |
| #include <sys/types.h> |
| #include <sys/stat.h> |
| |
| #include "SDL_timer.h" |
| #include "SDL_audio.h" |
| #include "SDL_stdinc.h" |
| #include "../SDL_audiomem.h" |
| #include "../SDL_audio_c.h" |
| #include "SDL_paudio.h" |
| |
| #define DEBUG_AUDIO 0 |
| |
| /* A conflict within AIX 4.3.3 <sys/> headers and probably others as well. |
| * I guess nobody ever uses audio... Shame over AIX header files. */ |
| #include <sys/machine.h> |
| #undef BIG_ENDIAN |
| #include <sys/audio.h> |
| |
| /* The tag name used by paud audio */ |
| #define PAUDIO_DRIVER_NAME "paud" |
| |
| /* Open the audio device for playback, and don't block if busy */ |
| /* #define OPEN_FLAGS (O_WRONLY|O_NONBLOCK) */ |
| #define OPEN_FLAGS O_WRONLY |
| |
| /* Get the name of the audio device we use for output */ |
| |
| #ifndef _PATH_DEV_DSP |
| #define _PATH_DEV_DSP "/dev/%caud%c/%c" |
| #endif |
| |
| static char devsettings[][3] = { |
| {'p', '0', '1'}, {'p', '0', '2'}, {'p', '0', '3'}, {'p', '0', '4'}, |
| {'p', '1', '1'}, {'p', '1', '2'}, {'p', '1', '3'}, {'p', '1', '4'}, |
| {'p', '2', '1'}, {'p', '2', '2'}, {'p', '2', '3'}, {'p', '2', '4'}, |
| {'p', '3', '1'}, {'p', '3', '2'}, {'p', '3', '3'}, {'p', '3', '4'}, |
| {'b', '0', '1'}, {'b', '0', '2'}, {'b', '0', '3'}, {'b', '0', '4'}, |
| {'b', '1', '1'}, {'b', '1', '2'}, {'b', '1', '3'}, {'b', '1', '4'}, |
| {'b', '2', '1'}, {'b', '2', '2'}, {'b', '2', '3'}, {'b', '2', '4'}, |
| {'b', '3', '1'}, {'b', '3', '2'}, {'b', '3', '3'}, {'b', '3', '4'}, |
| {'\0', '\0', '\0'} |
| }; |
| |
| static int |
| OpenUserDefinedDevice(char *path, int maxlen, int flags) |
| { |
| const char *audiodev; |
| int fd; |
| |
| /* Figure out what our audio device is */ |
| if ((audiodev = SDL_getenv("SDL_PATH_DSP")) == NULL) { |
| audiodev = SDL_getenv("AUDIODEV"); |
| } |
| if (audiodev == NULL) { |
| return -1; |
| } |
| fd = open(audiodev, flags, 0); |
| if (path != NULL) { |
| SDL_strlcpy(path, audiodev, maxlen); |
| path[maxlen - 1] = '\0'; |
| } |
| return fd; |
| } |
| |
| static int |
| OpenAudioPath(char *path, int maxlen, int flags, int classic) |
| { |
| struct stat sb; |
| int cycle = 0; |
| int fd = OpenUserDefinedDevice(path, maxlen, flags); |
| |
| if (fd != -1) { |
| return fd; |
| } |
| |
| /* !!! FIXME: do we really need a table here? */ |
| while (devsettings[cycle][0] != '\0') { |
| char audiopath[1024]; |
| SDL_snprintf(audiopath, SDL_arraysize(audiopath), |
| _PATH_DEV_DSP, |
| devsettings[cycle][0], |
| devsettings[cycle][1], devsettings[cycle][2]); |
| |
| if (stat(audiopath, &sb) == 0) { |
| fd = open(audiopath, flags, 0); |
| if (fd > 0) { |
| if (path != NULL) { |
| SDL_strlcpy(path, audiopath, maxlen); |
| } |
| return fd; |
| } |
| } |
| } |
| return -1; |
| } |
| |
| /* This function waits until it is possible to write a full sound buffer */ |
| static void |
| PAUDIO_WaitDevice(_THIS) |
| { |
| fd_set fdset; |
| |
| /* 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 { |
| audio_buffer paud_bufinfo; |
| |
| /* Use select() for audio synchronization */ |
| struct timeval timeout; |
| FD_ZERO(&fdset); |
| FD_SET(this->hidden->audio_fd, &fdset); |
| |
| if (ioctl(this->hidden->audio_fd, AUDIO_BUFFER, &paud_bufinfo) < 0) { |
| #ifdef DEBUG_AUDIO |
| fprintf(stderr, "Couldn't get audio buffer information\n"); |
| #endif |
| timeout.tv_sec = 10; |
| timeout.tv_usec = 0; |
| } else { |
| long ms_in_buf = paud_bufinfo.write_buf_time; |
| timeout.tv_sec = ms_in_buf / 1000; |
| ms_in_buf = ms_in_buf - timeout.tv_sec * 1000; |
| timeout.tv_usec = ms_in_buf * 1000; |
| #ifdef DEBUG_AUDIO |
| fprintf(stderr, |
| "Waiting for write_buf_time=%ld,%ld\n", |
| timeout.tv_sec, timeout.tv_usec); |
| #endif |
| } |
| |
| #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 - %s\n", strerror(errno), 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 |
| } |
| } |
| |
| static void |
| PAUDIO_PlayDevice(_THIS) |
| { |
| int written = 0; |
| const Uint8 *mixbuf = this->hidden->mixbuf; |
| const size_t mixlen = this->hidden->mixlen; |
| |
| /* Write the audio data, checking for EAGAIN on broken audio drivers */ |
| do { |
| written = write(this->hidden->audio_fd, mixbuf, mixlen); |
| if ((written < 0) && ((errno == 0) || (errno == EAGAIN))) { |
| SDL_Delay(1); /* Let a little CPU time go by */ |
| } |
| } |
| while ((written < 0) && |
| ((errno == 0) || (errno == EAGAIN) || (errno == EINTR))); |
| |
| /* 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 * |
| PAUDIO_GetDeviceBuf(_THIS) |
| { |
| return this->hidden->mixbuf; |
| } |
| |
| static void |
| PAUDIO_CloseDevice(_THIS) |
| { |
| if (this->hidden != NULL) { |
| if (this->hidden->mixbuf != 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 |
| PAUDIO_OpenDevice(_THIS, const char *devname, int iscapture) |
| { |
| const char *workaround = SDL_getenv("SDL_DSP_NOSELECT"); |
| char audiodev[1024]; |
| const char *err = NULL; |
| int format; |
| int bytes_per_sample; |
| SDL_AudioFormat test_format; |
| audio_init paud_init; |
| audio_buffer paud_bufinfo; |
| audio_status paud_status; |
| audio_control paud_control; |
| audio_change paud_change; |
| int fd = -1; |
| |
| /* Initialize all variables that we clean on shutdown */ |
| this->hidden = (struct SDL_PrivateAudioData *) |
| SDL_malloc((sizeof *this->hidden)); |
| if (this->hidden == NULL) { |
| SDL_OutOfMemory(); |
| return 0; |
| } |
| SDL_memset(this->hidden, 0, (sizeof *this->hidden)); |
| |
| /* Open the audio device */ |
| fd = OpenAudioPath(audiodev, sizeof(audiodev), OPEN_FLAGS, 0); |
| this->hidden->audio_fd = fd; |
| if (fd < 0) { |
| PAUDIO_CloseDevice(this); |
| SDL_SetError("Couldn't open %s: %s", audiodev, strerror(errno)); |
| return 0; |
| } |
| |
| /* |
| * We can't set the buffer size - just ask the device for the maximum |
| * that we can have. |
| */ |
| if (ioctl(fd, AUDIO_BUFFER, &paud_bufinfo) < 0) { |
| PAUDIO_CloseDevice(this); |
| SDL_SetError("Couldn't get audio buffer information"); |
| return 0; |
| } |
| |
| if (this->spec.channels > 1) |
| this->spec.channels = 2; |
| else |
| this->spec.channels = 1; |
| |
| /* |
| * Fields in the audio_init structure: |
| * |
| * Ignored by us: |
| * |
| * paud.loadpath[LOAD_PATH]; * DSP code to load, MWave chip only? |
| * paud.slot_number; * slot number of the adapter |
| * paud.device_id; * adapter identification number |
| * |
| * Input: |
| * |
| * paud.srate; * the sampling rate in Hz |
| * paud.bits_per_sample; * 8, 16, 32, ... |
| * paud.bsize; * block size for this rate |
| * paud.mode; * ADPCM, PCM, MU_LAW, A_LAW, SOURCE_MIX |
| * paud.channels; * 1=mono, 2=stereo |
| * paud.flags; * FIXED - fixed length data |
| * * LEFT_ALIGNED, RIGHT_ALIGNED (var len only) |
| * * TWOS_COMPLEMENT - 2's complement data |
| * * SIGNED - signed? comment seems wrong in sys/audio.h |
| * * BIG_ENDIAN |
| * paud.operation; * PLAY, RECORD |
| * |
| * Output: |
| * |
| * paud.flags; * PITCH - pitch is supported |
| * * INPUT - input is supported |
| * * OUTPUT - output is supported |
| * * MONITOR - monitor is supported |
| * * VOLUME - volume is supported |
| * * VOLUME_DELAY - volume delay is supported |
| * * BALANCE - balance is supported |
| * * BALANCE_DELAY - balance delay is supported |
| * * TREBLE - treble control is supported |
| * * BASS - bass control is supported |
| * * BESTFIT_PROVIDED - best fit returned |
| * * LOAD_CODE - DSP load needed |
| * paud.rc; * NO_PLAY - DSP code can't do play requests |
| * * NO_RECORD - DSP code can't do record requests |
| * * INVALID_REQUEST - request was invalid |
| * * CONFLICT - conflict with open's flags |
| * * OVERLOADED - out of DSP MIPS or memory |
| * paud.position_resolution; * smallest increment for position |
| */ |
| |
| paud_init.srate = this->spec.freq; |
| paud_init.mode = PCM; |
| paud_init.operation = PLAY; |
| paud_init.channels = this->spec.channels; |
| |
| /* Try for a closest match on audio format */ |
| format = 0; |
| for (test_format = SDL_FirstAudioFormat(this->spec.format); |
| !format && test_format;) { |
| #ifdef DEBUG_AUDIO |
| fprintf(stderr, "Trying format 0x%4.4x\n", test_format); |
| #endif |
| switch (test_format) { |
| case AUDIO_U8: |
| bytes_per_sample = 1; |
| paud_init.bits_per_sample = 8; |
| paud_init.flags = TWOS_COMPLEMENT | FIXED; |
| format = 1; |
| break; |
| case AUDIO_S8: |
| bytes_per_sample = 1; |
| paud_init.bits_per_sample = 8; |
| paud_init.flags = SIGNED | TWOS_COMPLEMENT | FIXED; |
| format = 1; |
| break; |
| case AUDIO_S16LSB: |
| bytes_per_sample = 2; |
| paud_init.bits_per_sample = 16; |
| paud_init.flags = SIGNED | TWOS_COMPLEMENT | FIXED; |
| format = 1; |
| break; |
| case AUDIO_S16MSB: |
| bytes_per_sample = 2; |
| paud_init.bits_per_sample = 16; |
| paud_init.flags = BIG_ENDIAN | SIGNED | TWOS_COMPLEMENT | FIXED; |
| format = 1; |
| break; |
| case AUDIO_U16LSB: |
| bytes_per_sample = 2; |
| paud_init.bits_per_sample = 16; |
| paud_init.flags = TWOS_COMPLEMENT | FIXED; |
| format = 1; |
| break; |
| case AUDIO_U16MSB: |
| bytes_per_sample = 2; |
| paud_init.bits_per_sample = 16; |
| paud_init.flags = BIG_ENDIAN | TWOS_COMPLEMENT | FIXED; |
| format = 1; |
| break; |
| default: |
| break; |
| } |
| if (!format) { |
| test_format = SDL_NextAudioFormat(); |
| } |
| } |
| if (format == 0) { |
| #ifdef DEBUG_AUDIO |
| fprintf(stderr, "Couldn't find any hardware audio formats\n"); |
| #endif |
| PAUDIO_CloseDevice(this); |
| SDL_SetError("Couldn't find any hardware audio formats"); |
| return 0; |
| } |
| this->spec.format = test_format; |
| |
| /* |
| * We know the buffer size and the max number of subsequent writes |
| * that can be pending. If more than one can pend, allow the application |
| * to do something like double buffering between our write buffer and |
| * the device's own buffer that we are filling with write() anyway. |
| * |
| * We calculate this->spec.samples like this because |
| * SDL_CalculateAudioSpec() will give put paud_bufinfo.write_buf_cap |
| * (or paud_bufinfo.write_buf_cap/2) into this->spec.size in return. |
| */ |
| if (paud_bufinfo.request_buf_cap == 1) { |
| this->spec.samples = paud_bufinfo.write_buf_cap |
| / bytes_per_sample / this->spec.channels; |
| } else { |
| this->spec.samples = paud_bufinfo.write_buf_cap |
| / bytes_per_sample / this->spec.channels / 2; |
| } |
| paud_init.bsize = bytes_per_sample * this->spec.channels; |
| |
| SDL_CalculateAudioSpec(&this->spec); |
| |
| /* |
| * The AIX paud device init can't modify the values of the audio_init |
| * structure that we pass to it. So we don't need any recalculation |
| * of this stuff and no reinit call as in linux dsp and dma code. |
| * |
| * /dev/paud supports all of the encoding formats, so we don't need |
| * to do anything like reopening the device, either. |
| */ |
| if (ioctl(fd, AUDIO_INIT, &paud_init) < 0) { |
| switch (paud_init.rc) { |
| case 1: |
| err = "Couldn't set audio format: DSP can't do play requests"; |
| break; |
| case 2: |
| err = "Couldn't set audio format: DSP can't do record requests"; |
| break; |
| case 4: |
| err = "Couldn't set audio format: request was invalid"; |
| break; |
| case 5: |
| err = "Couldn't set audio format: conflict with open's flags"; |
| break; |
| case 6: |
| err = "Couldn't set audio format: out of DSP MIPS or memory"; |
| break; |
| default: |
| err = "Couldn't set audio format: not documented in sys/audio.h"; |
| break; |
| } |
| } |
| |
| if (err != NULL) { |
| PAUDIO_CloseDevice(this); |
| SDL_SetError("Paudio: %s", err); |
| return 0; |
| } |
| |
| /* Allocate mixing buffer */ |
| this->hidden->mixlen = this->spec.size; |
| this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen); |
| if (this->hidden->mixbuf == NULL) { |
| PAUDIO_CloseDevice(this); |
| SDL_OutOfMemory(); |
| return 0; |
| } |
| SDL_memset(this->hidden->mixbuf, this->spec.silence, this->spec.size); |
| |
| /* |
| * Set some paramters: full volume, first speaker that we can find. |
| * Ignore the other settings for now. |
| */ |
| paud_change.input = AUDIO_IGNORE; /* the new input source */ |
| paud_change.output = OUTPUT_1; /* EXTERNAL_SPEAKER,INTERNAL_SPEAKER,OUTPUT_1 */ |
| paud_change.monitor = AUDIO_IGNORE; /* the new monitor state */ |
| paud_change.volume = 0x7fffffff; /* volume level [0-0x7fffffff] */ |
| paud_change.volume_delay = AUDIO_IGNORE; /* the new volume delay */ |
| paud_change.balance = 0x3fffffff; /* the new balance */ |
| paud_change.balance_delay = AUDIO_IGNORE; /* the new balance delay */ |
| paud_change.treble = AUDIO_IGNORE; /* the new treble state */ |
| paud_change.bass = AUDIO_IGNORE; /* the new bass state */ |
| paud_change.pitch = AUDIO_IGNORE; /* the new pitch state */ |
| |
| paud_control.ioctl_request = AUDIO_CHANGE; |
| paud_control.request_info = (char *) &paud_change; |
| if (ioctl(fd, AUDIO_CONTROL, &paud_control) < 0) { |
| #ifdef DEBUG_AUDIO |
| fprintf(stderr, "Can't change audio display settings\n"); |
| #endif |
| } |
| |
| /* |
| * Tell the device to expect data. Actual start will wait for |
| * the first write() call. |
| */ |
| paud_control.ioctl_request = AUDIO_START; |
| paud_control.position = 0; |
| if (ioctl(fd, AUDIO_CONTROL, &paud_control) < 0) { |
| PAUDIO_CloseDevice(this); |
| #ifdef DEBUG_AUDIO |
| fprintf(stderr, "Can't start audio play\n"); |
| #endif |
| SDL_SetError("Can't start audio play"); |
| return 0; |
| } |
| |
| /* Check to see if we need to use select() workaround */ |
| if (workaround != NULL) { |
| this->hidden->frame_ticks = (float) (this->spec.samples * 1000) / |
| this->spec.freq; |
| this->hidden->next_frame = SDL_GetTicks() + this->hidden->frame_ticks; |
| } |
| |
| /* We're ready to rock and roll. :-) */ |
| return 1; |
| } |
| |
| static int |
| PAUDIO_Init(SDL_AudioDriverImpl *impl) |
| { |
| int fd = OpenAudioPath(NULL, 0, OPEN_FLAGS, 0); |
| if (fd < 0) { |
| SDL_SetError("PAUDIO: Couldn't open audio device"); |
| return 0; |
| } |
| close(fd); |
| |
| /* Set the function pointers */ |
| impl->OpenDevice = DSP_OpenDevice; |
| impl->PlayDevice = DSP_PlayDevice; |
| impl->PlayDevice = DSP_WaitDevice; |
| impl->GetDeviceBuf = DSP_GetDeviceBuf; |
| impl->CloseDevice = DSP_CloseDevice; |
| impl->OnlyHasDefaultOutputDevice = 1; /* !!! FIXME: add device enum! */ |
| |
| return 1; |
| } |
| |
| AudioBootStrap PAUDIO_bootstrap = { |
| PAUDIO_DRIVER_NAME, "AIX Paudio", PAUDIO_Init, 0 |
| }; |
| |
| /* vi: set ts=4 sw=4 expandtab: */ |
