diff options
Diffstat (limited to 'distrib/sdl-1.2.15/src/audio/paudio/SDL_paudio.c')
| -rw-r--r-- | distrib/sdl-1.2.15/src/audio/paudio/SDL_paudio.c | 511 |
1 files changed, 511 insertions, 0 deletions
diff --git a/distrib/sdl-1.2.15/src/audio/paudio/SDL_paudio.c b/distrib/sdl-1.2.15/src/audio/paudio/SDL_paudio.c new file mode 100644 index 0000000..6270d8c --- /dev/null +++ b/distrib/sdl-1.2.15/src/audio/paudio/SDL_paudio.c @@ -0,0 +1,511 @@ +/* + 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 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/stat.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_paudio.h" + +#define DEBUG_AUDIO 1 + +/* 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 Paud_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 + +/* Audio driver functions */ +static int Paud_OpenAudio(_THIS, SDL_AudioSpec *spec); +static void Paud_WaitAudio(_THIS); +static void Paud_PlayAudio(_THIS); +static Uint8 *Paud_GetAudioBuf(_THIS); +static void Paud_CloseAudio(_THIS); + +/* 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 = Paud_OpenAudio; + this->WaitAudio = Paud_WaitAudio; + this->PlayAudio = Paud_PlayAudio; + this->GetAudioBuf = Paud_GetAudioBuf; + this->CloseAudio = Paud_CloseAudio; + + this->free = Audio_DeleteDevice; + + return this; +} + +AudioBootStrap Paud_bootstrap = { + Paud_DRIVER_NAME, "AIX Paudio", + Audio_Available, Audio_CreateDevice +}; + +/* This function waits until it is possible to write a full sound buffer */ +static void Paud_WaitAudio(_THIS) +{ + fd_set fdset; + + /* 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 { + audio_buffer paud_bufinfo; + + /* Use select() for audio synchronization */ + struct timeval timeout; + FD_ZERO(&fdset); + FD_SET(audio_fd, &fdset); + + if ( ioctl(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(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 */ + audio_fd = -1; +#ifdef DEBUG_AUDIO + fprintf(stderr, "Done disabling audio\n"); +#endif + } +#ifdef DEBUG_AUDIO + fprintf(stderr, "Ready!\n"); +#endif + } +} + +static void Paud_PlayAudio(_THIS) +{ + int written; + + /* Write the audio data, checking for EAGAIN on broken audio drivers */ + do { + written = write(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 ( 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 *Paud_GetAudioBuf(_THIS) +{ + return mixbuf; +} + +static void Paud_CloseAudio(_THIS) +{ + if ( mixbuf != NULL ) { + SDL_FreeAudioMem(mixbuf); + mixbuf = NULL; + } + if ( audio_fd >= 0 ) { + close(audio_fd); + audio_fd = -1; + } +} + +static int Paud_OpenAudio(_THIS, SDL_AudioSpec *spec) +{ + char audiodev[1024]; + int format; + int bytes_per_sample; + Uint16 test_format; + audio_init paud_init; + audio_buffer paud_bufinfo; + audio_status paud_status; + audio_control paud_control; + audio_change paud_change; + + /* Reset the timer synchronization flag */ + frame_ticks = 0.0; + + /* 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; + } + + /* + * We can't set the buffer size - just ask the device for the maximum + * that we can have. + */ + if ( ioctl(audio_fd, AUDIO_BUFFER, &paud_bufinfo) < 0 ) { + SDL_SetError("Couldn't get audio buffer information"); + return -1; + } + + mixbuf = NULL; + + if ( spec->channels > 1 ) + spec->channels = 2; + else + 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 = spec->freq; + paud_init.mode = PCM; + paud_init.operation = PLAY; + paud_init.channels = spec->channels; + + /* Try for a closest match on audio format */ + format = 0; + for ( test_format = SDL_FirstAudioFormat(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 + SDL_SetError("Couldn't find any hardware audio formats"); + return -1; + } + 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 spec->samples like this because SDL_CalculateAudioSpec() + * will give put paud_bufinfo.write_buf_cap (or paud_bufinfo.write_buf_cap/2) + * into spec->size in return. + */ + if ( paud_bufinfo.request_buf_cap == 1 ) + { + spec->samples = paud_bufinfo.write_buf_cap + / bytes_per_sample + / spec->channels; + } + else + { + spec->samples = paud_bufinfo.write_buf_cap + / bytes_per_sample + / spec->channels + / 2; + } + paud_init.bsize = bytes_per_sample * spec->channels; + + SDL_CalculateAudioSpec(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(audio_fd, AUDIO_INIT, &paud_init) < 0 ) { + switch ( paud_init.rc ) + { + case 1 : + SDL_SetError("Couldn't set audio format: DSP can't do play requests"); + return -1; + break; + case 2 : + SDL_SetError("Couldn't set audio format: DSP can't do record requests"); + return -1; + break; + case 4 : + SDL_SetError("Couldn't set audio format: request was invalid"); + return -1; + break; + case 5 : + SDL_SetError("Couldn't set audio format: conflict with open's flags"); + return -1; + break; + case 6 : + SDL_SetError("Couldn't set audio format: out of DSP MIPS or memory"); + return -1; + break; + default : + SDL_SetError("Couldn't set audio format: not documented in sys/audio.h"); + return -1; + break; + } + } + + /* Allocate mixing buffer */ + mixlen = spec->size; + mixbuf = (Uint8 *)SDL_AllocAudioMem(mixlen); + if ( mixbuf == NULL ) { + return -1; + } + SDL_memset(mixbuf, spec->silence, 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(audio_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(audio_fd, AUDIO_CONTROL, &paud_control) < 0 ) { +#ifdef DEBUG_AUDIO + fprintf(stderr, "Can't start audio play\n" ); +#endif + SDL_SetError("Can't start audio play"); + return -1; + } + + /* Check to see if we need to use select() workaround */ + { char *workaround; + workaround = SDL_getenv("SDL_DSP_NOSELECT"); + if ( workaround ) { + frame_ticks = (float)(spec->samples*1000)/spec->freq; + next_frame = SDL_GetTicks()+frame_ticks; + } + } + + /* Get the parent process id (we're the parent of the audio thread) */ + parent = getpid(); + + /* We're ready to rock and roll. :-) */ + return 0; +} + |