diff options
Diffstat (limited to 'distrib/sdl-1.2.15/src/audio/arts/SDL_artsaudio.c')
| -rw-r--r-- | distrib/sdl-1.2.15/src/audio/arts/SDL_artsaudio.c | 362 |
1 files changed, 362 insertions, 0 deletions
diff --git a/distrib/sdl-1.2.15/src/audio/arts/SDL_artsaudio.c b/distrib/sdl-1.2.15/src/audio/arts/SDL_artsaudio.c new file mode 100644 index 0000000..373f8c1 --- /dev/null +++ b/distrib/sdl-1.2.15/src/audio/arts/SDL_artsaudio.c @@ -0,0 +1,362 @@ +/* + 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 + + Sam Lantinga + slouken@libsdl.org +*/ +#include "SDL_config.h" + +/* Allow access to a raw mixing buffer */ + +#ifdef HAVE_SIGNAL_H +#include <signal.h> +#endif +#include <unistd.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_artsaudio.h" + +#ifdef SDL_AUDIO_DRIVER_ARTS_DYNAMIC +#include "SDL_name.h" +#include "SDL_loadso.h" +#else +#define SDL_NAME(X) X +#endif + +/* The tag name used by artsc audio */ +#define ARTS_DRIVER_NAME "arts" + +/* Audio driver functions */ +static int ARTS_OpenAudio(_THIS, SDL_AudioSpec *spec); +static void ARTS_WaitAudio(_THIS); +static void ARTS_PlayAudio(_THIS); +static Uint8 *ARTS_GetAudioBuf(_THIS); +static void ARTS_CloseAudio(_THIS); + +#ifdef SDL_AUDIO_DRIVER_ARTS_DYNAMIC + +static const char *arts_library = SDL_AUDIO_DRIVER_ARTS_DYNAMIC; +static void *arts_handle = NULL; +static int arts_loaded = 0; + +static int (*SDL_NAME(arts_init))(void); +static void (*SDL_NAME(arts_free))(void); +static arts_stream_t (*SDL_NAME(arts_play_stream))(int rate, int bits, int channels, const char *name); +static int (*SDL_NAME(arts_stream_set))(arts_stream_t s, arts_parameter_t param, int value); +static int (*SDL_NAME(arts_stream_get))(arts_stream_t s, arts_parameter_t param); +static int (*SDL_NAME(arts_write))(arts_stream_t s, const void *buffer, int count); +static void (*SDL_NAME(arts_close_stream))(arts_stream_t s); +static int (*SDL_NAME(arts_suspend))(void); +static int (*SDL_NAME(arts_suspended))(void); +static const char *(*SDL_NAME(arts_error_text))(int errorcode); + +static struct { + const char *name; + void **func; +} arts_functions[] = { + { "arts_init", (void **)&SDL_NAME(arts_init) }, + { "arts_free", (void **)&SDL_NAME(arts_free) }, + { "arts_play_stream", (void **)&SDL_NAME(arts_play_stream) }, + { "arts_stream_set", (void **)&SDL_NAME(arts_stream_set) }, + { "arts_stream_get", (void **)&SDL_NAME(arts_stream_get) }, + { "arts_write", (void **)&SDL_NAME(arts_write) }, + { "arts_close_stream", (void **)&SDL_NAME(arts_close_stream) }, + { "arts_suspend", (void **)&SDL_NAME(arts_suspend) }, + { "arts_suspended", (void **)&SDL_NAME(arts_suspended) }, + { "arts_error_text", (void **)&SDL_NAME(arts_error_text) }, +}; + +static void UnloadARTSLibrary() +{ + if ( arts_loaded ) { + SDL_UnloadObject(arts_handle); + arts_handle = NULL; + arts_loaded = 0; + } +} + +static int LoadARTSLibrary(void) +{ + int i, retval = -1; + + arts_handle = SDL_LoadObject(arts_library); + if ( arts_handle ) { + arts_loaded = 1; + retval = 0; + for ( i=0; i<SDL_arraysize(arts_functions); ++i ) { + *arts_functions[i].func = SDL_LoadFunction(arts_handle, arts_functions[i].name); + if ( !*arts_functions[i].func ) { + retval = -1; + UnloadARTSLibrary(); + break; + } + } + } + return retval; +} + +#else + +static void UnloadARTSLibrary() +{ + return; +} + +static int LoadARTSLibrary(void) +{ + return 0; +} + +#endif /* SDL_AUDIO_DRIVER_ARTS_DYNAMIC */ + +/* Audio driver bootstrap functions */ + +static int ARTS_Suspend(void) +{ + const Uint32 abortms = SDL_GetTicks() + 3000; /* give up after 3 secs */ + while ( (!SDL_NAME(arts_suspended)()) && (SDL_GetTicks() < abortms) ) { + if ( SDL_NAME(arts_suspend)() ) { + break; + } + } + + return SDL_NAME(arts_suspended)(); +} + +static int Audio_Available(void) +{ + int available = 0; + + if ( LoadARTSLibrary() < 0 ) { + return available; + } + if ( SDL_NAME(arts_init)() == 0 ) { + if ( ARTS_Suspend() ) { + /* Play a stream so aRts doesn't crash */ + arts_stream_t stream2; + stream2=SDL_NAME(arts_play_stream)(44100, 16, 2, "SDL"); + SDL_NAME(arts_write)(stream2, "", 0); + SDL_NAME(arts_close_stream)(stream2); + available = 1; + } + SDL_NAME(arts_free)(); + } + UnloadARTSLibrary(); + + return available; +} + +static void Audio_DeleteDevice(SDL_AudioDevice *device) +{ + SDL_free(device->hidden); + SDL_free(device); + UnloadARTSLibrary(); +} + +static SDL_AudioDevice *Audio_CreateDevice(int devindex) +{ + SDL_AudioDevice *this; + + /* Initialize all variables that we clean on shutdown */ + LoadARTSLibrary(); + 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)); + stream = 0; + + /* Set the function pointers */ + this->OpenAudio = ARTS_OpenAudio; + this->WaitAudio = ARTS_WaitAudio; + this->PlayAudio = ARTS_PlayAudio; + this->GetAudioBuf = ARTS_GetAudioBuf; + this->CloseAudio = ARTS_CloseAudio; + + this->free = Audio_DeleteDevice; + + return this; +} + +AudioBootStrap ARTS_bootstrap = { + ARTS_DRIVER_NAME, "Analog Realtime Synthesizer", + Audio_Available, Audio_CreateDevice +}; + +/* This function waits until it is possible to write a full sound buffer */ +static void ARTS_WaitAudio(_THIS) +{ + Sint32 ticks; + + /* Check to see if the thread-parent process is still alive */ + { static int cnt = 0; + /* Note that this only works with thread implementations + that use a different process id for each thread. + */ + if (parent && (((++cnt)%10) == 0)) { /* Check every 10 loops */ + if ( kill(parent, 0) < 0 ) { + this->enabled = 0; + } + } + } + + /* Use timer for general audio synchronization */ + ticks = ((Sint32)(next_frame - SDL_GetTicks()))-FUDGE_TICKS; + if ( ticks > 0 ) { + SDL_Delay(ticks); + } +} + +static void ARTS_PlayAudio(_THIS) +{ + int written; + + /* Write the audio data */ + written = SDL_NAME(arts_write)(stream, mixbuf, mixlen); + + /* 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 *ARTS_GetAudioBuf(_THIS) +{ + return(mixbuf); +} + +static void ARTS_CloseAudio(_THIS) +{ + if ( mixbuf != NULL ) { + SDL_FreeAudioMem(mixbuf); + mixbuf = NULL; + } + if ( stream ) { + SDL_NAME(arts_close_stream)(stream); + stream = 0; + } + SDL_NAME(arts_free)(); +} + +static int ARTS_OpenAudio(_THIS, SDL_AudioSpec *spec) +{ + int bits, frag_spec; + Uint16 test_format, format; + int error_code; + + /* Reset the timer synchronization flag */ + frame_ticks = 0.0; + + mixbuf = NULL; + + /* Try for a closest match on audio format */ + format = 0; + bits = 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: + bits = 8; + format = 1; + break; + case AUDIO_S16LSB: + bits = 16; + format = 1; + break; + default: + format = 0; + break; + } + if ( ! format ) { + test_format = SDL_NextAudioFormat(); + } + } + if ( format == 0 ) { + SDL_SetError("Couldn't find any hardware audio formats"); + return(-1); + } + spec->format = test_format; + + error_code = SDL_NAME(arts_init)(); + if ( error_code != 0 ) { + SDL_SetError("Unable to initialize ARTS: %s", SDL_NAME(arts_error_text)(error_code)); + return(-1); + } + if ( ! ARTS_Suspend() ) { + SDL_SetError("ARTS can not open audio device"); + return(-1); + } + stream = SDL_NAME(arts_play_stream)(spec->freq, bits, spec->channels, "SDL"); + + /* Calculate the final parameters for this audio specification */ + SDL_CalculateAudioSpec(spec); + + /* Determine the power of two of the fragment size */ + for ( frag_spec = 0; (0x01<<frag_spec) < spec->size; ++frag_spec ); + if ( (0x01<<frag_spec) != spec->size ) { + SDL_SetError("Fragment size must be a power of two"); + return(-1); + } + frag_spec |= 0x00020000; /* two fragments, for low latency */ + +#ifdef ARTS_P_PACKET_SETTINGS + SDL_NAME(arts_stream_set)(stream, ARTS_P_PACKET_SETTINGS, frag_spec); +#else + SDL_NAME(arts_stream_set)(stream, ARTS_P_PACKET_SIZE, frag_spec&0xffff); + SDL_NAME(arts_stream_set)(stream, ARTS_P_PACKET_COUNT, frag_spec>>16); +#endif + spec->size = SDL_NAME(arts_stream_get)(stream, ARTS_P_PACKET_SIZE); + + /* Allocate mixing buffer */ + mixlen = spec->size; + mixbuf = (Uint8 *)SDL_AllocAudioMem(mixlen); + if ( mixbuf == NULL ) { + return(-1); + } + SDL_memset(mixbuf, spec->silence, spec->size); + + /* Get the parent process id (we're the parent of the audio thread) */ + parent = getpid(); + + /* We're ready to rock and roll. :-) */ + return(0); +} |