| /* |
| Simple DirectMedia Layer |
| Copyright (C) 1997-2016 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_SUNAUDIO |
| |
| /* Allow access to a raw mixing buffer */ |
| |
| #include <fcntl.h> |
| #include <errno.h> |
| #ifdef __NETBSD__ |
| #include <sys/ioctl.h> |
| #include <sys/audioio.h> |
| #endif |
| #ifdef __SVR4 |
| #include <sys/audioio.h> |
| #else |
| #include <sys/time.h> |
| #include <sys/types.h> |
| #endif |
| #include <unistd.h> |
| |
| #include "SDL_timer.h" |
| #include "SDL_audio.h" |
| #include "../SDL_audio_c.h" |
| #include "../SDL_audiodev_c.h" |
| #include "SDL_sunaudio.h" |
| |
| /* Open the audio device for playback, and don't block if busy */ |
| |
| #if defined(AUDIO_GETINFO) && !defined(AUDIO_GETBUFINFO) |
| #define AUDIO_GETBUFINFO AUDIO_GETINFO |
| #endif |
| |
| /* Audio driver functions */ |
| static Uint8 snd2au(int sample); |
| |
| /* Audio driver bootstrap functions */ |
| static void |
| SUNAUDIO_DetectDevices(void) |
| { |
| SDL_EnumUnixAudioDevices(1, (int (*)(int)) NULL); |
| } |
| |
| #ifdef DEBUG_AUDIO |
| void |
| CheckUnderflow(_THIS) |
| { |
| #ifdef AUDIO_GETBUFINFO |
| audio_info_t info; |
| int left; |
| |
| ioctl(this->hidden->audio_fd, AUDIO_GETBUFINFO, &info); |
| left = (this->hidden->written - info.play.samples); |
| if (this->hidden->written && (left == 0)) { |
| fprintf(stderr, "audio underflow!\n"); |
| } |
| #endif |
| } |
| #endif |
| |
| static void |
| SUNAUDIO_WaitDevice(_THIS) |
| { |
| #ifdef AUDIO_GETBUFINFO |
| #define SLEEP_FUDGE 10 /* 10 ms scheduling fudge factor */ |
| audio_info_t info; |
| Sint32 left; |
| |
| ioctl(this->hidden->audio_fd, AUDIO_GETBUFINFO, &info); |
| left = (this->hidden->written - info.play.samples); |
| if (left > this->hidden->fragsize) { |
| Sint32 sleepy; |
| |
| sleepy = ((left - this->hidden->fragsize) / this->hidden->frequency); |
| sleepy -= SLEEP_FUDGE; |
| if (sleepy > 0) { |
| SDL_Delay(sleepy); |
| } |
| } |
| #else |
| fd_set fdset; |
| |
| FD_ZERO(&fdset); |
| FD_SET(this->hidden->audio_fd, &fdset); |
| select(this->hidden->audio_fd + 1, NULL, &fdset, NULL, NULL); |
| #endif |
| } |
| |
| static void |
| SUNAUDIO_PlayDevice(_THIS) |
| { |
| /* Write the audio data */ |
| if (this->hidden->ulaw_only) { |
| /* Assuming that this->spec.freq >= 8000 Hz */ |
| int accum, incr, pos; |
| Uint8 *aubuf; |
| |
| accum = 0; |
| incr = this->spec.freq / 8; |
| aubuf = this->hidden->ulaw_buf; |
| switch (this->hidden->audio_fmt & 0xFF) { |
| case 8: |
| { |
| Uint8 *sndbuf; |
| |
| sndbuf = this->hidden->mixbuf; |
| for (pos = 0; pos < this->hidden->fragsize; ++pos) { |
| *aubuf = snd2au((0x80 - *sndbuf) * 64); |
| accum += incr; |
| while (accum > 0) { |
| accum -= 1000; |
| sndbuf += 1; |
| } |
| aubuf += 1; |
| } |
| } |
| break; |
| case 16: |
| { |
| Sint16 *sndbuf; |
| |
| sndbuf = (Sint16 *) this->hidden->mixbuf; |
| for (pos = 0; pos < this->hidden->fragsize; ++pos) { |
| *aubuf = snd2au(*sndbuf / 4); |
| accum += incr; |
| while (accum > 0) { |
| accum -= 1000; |
| sndbuf += 1; |
| } |
| aubuf += 1; |
| } |
| } |
| break; |
| } |
| #ifdef DEBUG_AUDIO |
| CheckUnderflow(this); |
| #endif |
| if (write(this->hidden->audio_fd, this->hidden->ulaw_buf, |
| this->hidden->fragsize) < 0) { |
| /* Assume fatal error, for now */ |
| SDL_OpenedAudioDeviceDisconnected(this); |
| } |
| this->hidden->written += this->hidden->fragsize; |
| } else { |
| #ifdef DEBUG_AUDIO |
| CheckUnderflow(this); |
| #endif |
| if (write(this->hidden->audio_fd, this->hidden->mixbuf, |
| this->spec.size) < 0) { |
| /* Assume fatal error, for now */ |
| SDL_OpenedAudioDeviceDisconnected(this); |
| } |
| this->hidden->written += this->hidden->fragsize; |
| } |
| } |
| |
| static Uint8 * |
| SUNAUDIO_GetDeviceBuf(_THIS) |
| { |
| return (this->hidden->mixbuf); |
| } |
| |
| static void |
| SUNAUDIO_CloseDevice(_THIS) |
| { |
| SDL_free(this->hidden->ulaw_buf); |
| if (this->hidden->audio_fd >= 0) { |
| close(this->hidden->audio_fd); |
| } |
| SDL_free(this->hidden->mixbuf); |
| SDL_free(this->hidden); |
| } |
| |
| static int |
| SUNAUDIO_OpenDevice(_THIS, void *handle, 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_zerop(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)); |
| } |
| |
| #ifdef AUDIO_SETINFO |
| int enc; |
| #endif |
| int desired_freq = this->spec.freq; |
| |
| /* Determine the audio parameters from the AudioSpec */ |
| switch (SDL_AUDIO_BITSIZE(this->spec.format)) { |
| |
| case 8: |
| { /* Unsigned 8 bit audio data */ |
| this->spec.format = AUDIO_U8; |
| #ifdef AUDIO_SETINFO |
| enc = AUDIO_ENCODING_LINEAR8; |
| #endif |
| } |
| break; |
| |
| case 16: |
| { /* Signed 16 bit audio data */ |
| this->spec.format = AUDIO_S16SYS; |
| #ifdef AUDIO_SETINFO |
| enc = AUDIO_ENCODING_LINEAR; |
| #endif |
| } |
| break; |
| |
| default: |
| { |
| /* !!! FIXME: fallback to conversion on unsupported types! */ |
| return SDL_SetError("Unsupported audio format"); |
| } |
| } |
| this->hidden->audio_fmt = this->spec.format; |
| |
| this->hidden->ulaw_only = 0; /* modern Suns do support linear audio */ |
| #ifdef AUDIO_SETINFO |
| for (;;) { |
| audio_info_t info; |
| AUDIO_INITINFO(&info); /* init all fields to "no change" */ |
| |
| /* Try to set the requested settings */ |
| info.play.sample_rate = this->spec.freq; |
| info.play.channels = this->spec.channels; |
| info.play.precision = (enc == AUDIO_ENCODING_ULAW) |
| ? 8 : this->spec.format & 0xff; |
| info.play.encoding = enc; |
| if (ioctl(this->hidden->audio_fd, AUDIO_SETINFO, &info) == 0) { |
| |
| /* Check to be sure we got what we wanted */ |
| if (ioctl(this->hidden->audio_fd, AUDIO_GETINFO, &info) < 0) { |
| return SDL_SetError("Error getting audio parameters: %s", |
| strerror(errno)); |
| } |
| if (info.play.encoding == enc |
| && info.play.precision == (this->spec.format & 0xff) |
| && info.play.channels == this->spec.channels) { |
| /* Yow! All seems to be well! */ |
| this->spec.freq = info.play.sample_rate; |
| break; |
| } |
| } |
| |
| switch (enc) { |
| case AUDIO_ENCODING_LINEAR8: |
| /* unsigned 8bit apparently not supported here */ |
| enc = AUDIO_ENCODING_LINEAR; |
| this->spec.format = AUDIO_S16SYS; |
| break; /* try again */ |
| |
| case AUDIO_ENCODING_LINEAR: |
| /* linear 16bit didn't work either, resort to ยต-law */ |
| enc = AUDIO_ENCODING_ULAW; |
| this->spec.channels = 1; |
| this->spec.freq = 8000; |
| this->spec.format = AUDIO_U8; |
| this->hidden->ulaw_only = 1; |
| break; |
| |
| default: |
| /* oh well... */ |
| return SDL_SetError("Error setting audio parameters: %s", |
| strerror(errno)); |
| } |
| } |
| #endif /* AUDIO_SETINFO */ |
| this->hidden->written = 0; |
| |
| /* We can actually convert on-the-fly to U-Law */ |
| if (this->hidden->ulaw_only) { |
| this->spec.freq = desired_freq; |
| this->hidden->fragsize = (this->spec.samples * 1000) / |
| (this->spec.freq / 8); |
| this->hidden->frequency = 8; |
| this->hidden->ulaw_buf = (Uint8 *) SDL_malloc(this->hidden->fragsize); |
| if (this->hidden->ulaw_buf == NULL) { |
| return SDL_OutOfMemory(); |
| } |
| this->spec.channels = 1; |
| } else { |
| this->hidden->fragsize = this->spec.samples; |
| this->hidden->frequency = this->spec.freq / 1000; |
| } |
| #ifdef DEBUG_AUDIO |
| fprintf(stderr, "Audio device %s U-Law only\n", |
| this->hidden->ulaw_only ? "is" : "is not"); |
| fprintf(stderr, "format=0x%x chan=%d freq=%d\n", |
| this->spec.format, this->spec.channels, this->spec.freq); |
| #endif |
| |
| /* Update the fragment size as size in bytes */ |
| SDL_CalculateAudioSpec(&this->spec); |
| |
| /* Allocate mixing buffer */ |
| this->hidden->mixbuf = (Uint8 *) SDL_malloc(this->spec.size); |
| if (this->hidden->mixbuf == NULL) { |
| return SDL_OutOfMemory(); |
| } |
| SDL_memset(this->hidden->mixbuf, this->spec.silence, this->spec.size); |
| |
| /* We're ready to rock and roll. :-) */ |
| return 0; |
| } |
| |
| /************************************************************************/ |
| /* This function (snd2au()) copyrighted: */ |
| /************************************************************************/ |
| /* Copyright 1989 by Rich Gopstein and Harris Corporation */ |
| /* */ |
| /* Permission to use, copy, modify, and distribute this software */ |
| /* and its documentation for any purpose and without fee is */ |
| /* hereby granted, provided that the above copyright notice */ |
| /* appears in all copies and that both that copyright notice and */ |
| /* this permission notice appear in supporting documentation, and */ |
| /* that the name of Rich Gopstein and Harris Corporation not be */ |
| /* used in advertising or publicity pertaining to distribution */ |
| /* of the software without specific, written prior permission. */ |
| /* Rich Gopstein and Harris Corporation make no representations */ |
| /* about the suitability of this software for any purpose. It */ |
| /* provided "as is" without express or implied warranty. */ |
| /************************************************************************/ |
| |
| static Uint8 |
| snd2au(int sample) |
| { |
| |
| int mask; |
| |
| if (sample < 0) { |
| sample = -sample; |
| mask = 0x7f; |
| } else { |
| mask = 0xff; |
| } |
| |
| if (sample < 32) { |
| sample = 0xF0 | (15 - sample / 2); |
| } else if (sample < 96) { |
| sample = 0xE0 | (15 - (sample - 32) / 4); |
| } else if (sample < 224) { |
| sample = 0xD0 | (15 - (sample - 96) / 8); |
| } else if (sample < 480) { |
| sample = 0xC0 | (15 - (sample - 224) / 16); |
| } else if (sample < 992) { |
| sample = 0xB0 | (15 - (sample - 480) / 32); |
| } else if (sample < 2016) { |
| sample = 0xA0 | (15 - (sample - 992) / 64); |
| } else if (sample < 4064) { |
| sample = 0x90 | (15 - (sample - 2016) / 128); |
| } else if (sample < 8160) { |
| sample = 0x80 | (15 - (sample - 4064) / 256); |
| } else { |
| sample = 0x80; |
| } |
| return (mask & sample); |
| } |
| |
| static int |
| SUNAUDIO_Init(SDL_AudioDriverImpl * impl) |
| { |
| /* Set the function pointers */ |
| impl->DetectDevices = SUNAUDIO_DetectDevices; |
| impl->OpenDevice = SUNAUDIO_OpenDevice; |
| impl->PlayDevice = SUNAUDIO_PlayDevice; |
| impl->WaitDevice = SUNAUDIO_WaitDevice; |
| impl->GetDeviceBuf = SUNAUDIO_GetDeviceBuf; |
| impl->CloseDevice = SUNAUDIO_CloseDevice; |
| |
| impl->AllowsArbitraryDeviceNames = 1; |
| |
| return 1; /* this audio target is available. */ |
| } |
| |
| AudioBootStrap SUNAUDIO_bootstrap = { |
| "audio", "UNIX /dev/audio interface", SUNAUDIO_Init, 0 |
| }; |
| |
| #endif /* SDL_AUDIO_DRIVER_SUNAUDIO */ |
| |
| /* vi: set ts=4 sw=4 expandtab: */ |
