diff options
Diffstat (limited to 'Source/external/SDL2/src/audio/paudio/SDL_paudio.c')
| -rw-r--r-- | Source/external/SDL2/src/audio/paudio/SDL_paudio.c | 516 |
1 files changed, 516 insertions, 0 deletions
diff --git a/Source/external/SDL2/src/audio/paudio/SDL_paudio.c b/Source/external/SDL2/src/audio/paudio/SDL_paudio.c new file mode 100644 index 0000000..1e8c124 --- /dev/null +++ b/Source/external/SDL2/src/audio/paudio/SDL_paudio.c @@ -0,0 +1,516 @@ +/* + Simple DirectMedia Layer + Copyright (C) 1997-2018 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_PAUDIO + +/* 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_audio_c.h" +#include "../../core/unix/SDL_poll.h" +#include "SDL_paudio.h" + +/* #define DEBUG_AUDIO */ + +/* 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> + +/* 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 { + int timeoutMS; + audio_buffer paud_bufinfo; + + if (ioctl(this->hidden->audio_fd, AUDIO_BUFFER, &paud_bufinfo) < 0) { +#ifdef DEBUG_AUDIO + fprintf(stderr, "Couldn't get audio buffer information\n"); +#endif + timeoutMS = 10 * 1000; + } else { + timeoutMS = paud_bufinfo.write_buf_time; +#ifdef DEBUG_AUDIO + fprintf(stderr, "Waiting for write_buf_time=%d ms\n", timeoutMS); +#endif + } + +#ifdef DEBUG_AUDIO + fprintf(stderr, "Waiting for audio to get ready\n"); +#endif + if (SDL_IOReady(this->hidden->audio_fd, SDL_TRUE, timeoutMS) <= 0) { + /* + * 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 - Audio timeout - buggy audio driver? (disabled)\n", strerror(errno)); + SDL_OpenedAudioDeviceDisconnected(this); + /* 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) { + SDL_OpenedAudioDeviceDisconnected(this); + } +#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->audio_fd >= 0) { + close(this->hidden->audio_fd); + } + SDL_free(this->hidden->mixbuf); + SDL_free(this->hidden); +} + +static int +PAUDIO_OpenDevice(_THIS, void *handle, 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_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) { + return SDL_OutOfMemory(); + } + SDL_zerop(this->hidden); + + /* Open the audio device */ + fd = OpenAudioPath(audiodev, sizeof(audiodev), OPEN_FLAGS, 0); + this->hidden->audio_fd = fd; + if (fd < 0) { + return SDL_SetError("Couldn't open %s: %s", audiodev, strerror(errno)); + } + + /* + * 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) { + return SDL_SetError("Couldn't get audio buffer information"); + } + + 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 + return SDL_SetError("Couldn't find any hardware audio formats"); + } + 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 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) { + return SDL_SetError("Paudio: %s", err); + } + + /* Allocate mixing buffer */ + this->hidden->mixlen = this->spec.size; + this->hidden->mixbuf = (Uint8 *) SDL_malloc(this->hidden->mixlen); + if (this->hidden->mixbuf == NULL) { + return SDL_OutOfMemory(); + } + 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) { +#ifdef DEBUG_AUDIO + fprintf(stderr, "Can't start audio play\n"); +#endif + return SDL_SetError("Can't start audio play"); + } + + /* Check to see if we need to use SDL_IOReady() 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 0; +} + +static int +PAUDIO_Init(SDL_AudioDriverImpl * impl) +{ + /* !!! FIXME: not right for device enum? */ + 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 = PAUDIO_OpenDevice; + impl->PlayDevice = PAUDIO_PlayDevice; + impl->PlayDevice = PAUDIO_WaitDevice; + impl->GetDeviceBuf = PAUDIO_GetDeviceBuf; + impl->CloseDevice = PAUDIO_CloseDevice; + impl->OnlyHasDefaultOutputDevice = 1; /* !!! FIXME: add device enum! */ + + return 1; /* this audio target is available. */ +} + +AudioBootStrap PAUDIO_bootstrap = { + "paud", "AIX Paudio", PAUDIO_Init, 0 +}; + +#endif /* SDL_AUDIO_DRIVER_PAUDIO */ + +/* vi: set ts=4 sw=4 expandtab: */ |