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Diffstat (limited to 'distrib/sdl-1.2.12/src/audio/dma/SDL_dmaaudio.c')
-rw-r--r--distrib/sdl-1.2.12/src/audio/dma/SDL_dmaaudio.c455
1 files changed, 0 insertions, 455 deletions
diff --git a/distrib/sdl-1.2.12/src/audio/dma/SDL_dmaaudio.c b/distrib/sdl-1.2.12/src/audio/dma/SDL_dmaaudio.c
deleted file mode 100644
index 84734a3..0000000
--- a/distrib/sdl-1.2.12/src/audio/dma/SDL_dmaaudio.c
+++ /dev/null
@@ -1,455 +0,0 @@
-/*
- 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
-
- Sam Lantinga
- slouken@libsdl.org
-*/
-#include "SDL_config.h"
-
-/* Allow access to a raw mixing buffer */
-
-#include <stdio.h>
-#include <string.h> /* For strerror() */
-#include <errno.h>
-#include <unistd.h>
-#include <fcntl.h>
-#include <signal.h>
-#include <sys/types.h>
-#include <sys/time.h>
-#include <sys/ioctl.h>
-#include <sys/stat.h>
-#include <sys/mman.h>
-
-#if SDL_AUDIO_DRIVER_OSS_SOUNDCARD_H
-/* This is installed on some systems */
-#include <soundcard.h>
-#else
-/* This is recommended by OSS */
-#include <sys/soundcard.h>
-#endif
-
-#ifndef MAP_FAILED
-#define MAP_FAILED ((Uint8 *)-1)
-#endif
-
-#include "SDL_timer.h"
-#include "SDL_audio.h"
-#include "../SDL_audio_c.h"
-#include "../SDL_audiodev_c.h"
-#include "SDL_dmaaudio.h"
-
-/* The tag name used by DMA audio */
-#define DMA_DRIVER_NAME "dma"
-
-/* Open the audio device for playback, and don't block if busy */
-#define OPEN_FLAGS (O_RDWR|O_NONBLOCK)
-
-/* Audio driver functions */
-static int DMA_OpenAudio(_THIS, SDL_AudioSpec *spec);
-static void DMA_WaitAudio(_THIS);
-static void DMA_PlayAudio(_THIS);
-static Uint8 *DMA_GetAudioBuf(_THIS);
-static void DMA_CloseAudio(_THIS);
-
-/* Audio driver bootstrap functions */
-
-static int Audio_Available(void)
-{
- int available;
- int fd;
-
- available = 0;
-
- fd = SDL_OpenAudioPath(NULL, 0, OPEN_FLAGS, 0);
- if ( fd >= 0 ) {
- int caps;
- struct audio_buf_info info;
-
- if ( (ioctl(fd, SNDCTL_DSP_GETCAPS, &caps) == 0) &&
- (caps & DSP_CAP_TRIGGER) && (caps & DSP_CAP_MMAP) &&
- (ioctl(fd, SNDCTL_DSP_GETOSPACE, &info) == 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 = DMA_OpenAudio;
- this->WaitAudio = DMA_WaitAudio;
- this->PlayAudio = DMA_PlayAudio;
- this->GetAudioBuf = DMA_GetAudioBuf;
- this->CloseAudio = DMA_CloseAudio;
-
- this->free = Audio_DeleteDevice;
-
- return this;
-}
-
-AudioBootStrap DMA_bootstrap = {
- DMA_DRIVER_NAME, "OSS /dev/dsp DMA audio",
- Audio_Available, Audio_CreateDevice
-};
-
-/* This function waits until it is possible to write a full sound buffer */
-static void DMA_WaitAudio(_THIS)
-{
- fd_set fdset;
-
- /* 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;
- }
- }
- }
-
- /* 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 {
- /* Use select() for audio synchronization */
- struct timeval timeout;
- FD_ZERO(&fdset);
- FD_SET(audio_fd, &fdset);
- timeout.tv_sec = 10;
- timeout.tv_usec = 0;
-#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 =
-#ifdef AUDIO_OSPACE_HACK
- "Audio timeout - buggy audio driver? (trying ospace)";
-#else
- "Audio timeout - buggy audio driver? (disabled)";
-#endif
- /* 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\n", message);
-#ifdef AUDIO_OSPACE_HACK
- /* We may be able to use GET_OSPACE trick */
- frame_ticks = (float)(this->spec->samples*1000) /
- this->spec->freq;
- next_frame = SDL_GetTicks()+frame_ticks;
-#else
- this->enabled = 0;
- /* Don't try to close - may hang */
- audio_fd = -1;
-#ifdef DEBUG_AUDIO
- fprintf(stderr, "Done disabling audio\n");
-#endif
-#endif /* AUDIO_OSPACE_HACK */
- }
-#ifdef DEBUG_AUDIO
- fprintf(stderr, "Ready!\n");
-#endif
- }
-}
-
-static void DMA_PlayAudio(_THIS)
-{
- /* If timer synchronization is enabled, set the next write frame */
- if ( frame_ticks ) {
- next_frame += frame_ticks;
- }
- return;
-}
-
-static Uint8 *DMA_GetAudioBuf(_THIS)
-{
- count_info info;
- int playing;
- int filling;
-
- /* Get number of blocks, looping if we're not using select() */
- do {
- if ( ioctl(audio_fd, SNDCTL_DSP_GETOPTR, &info) < 0 ) {
- /* Uh oh... */
- this->enabled = 0;
- return(NULL);
- }
- } while ( frame_ticks && (info.blocks < 1) );
-#ifdef DEBUG_AUDIO
- if ( info.blocks > 1 ) {
- printf("Warning: audio underflow (%d frags)\n", info.blocks-1);
- }
-#endif
- playing = info.ptr / this->spec.size;
- filling = (playing + 1)%num_buffers;
- return (dma_buf + (filling * this->spec.size));
-}
-
-static void DMA_CloseAudio(_THIS)
-{
- if ( dma_buf != NULL ) {
- munmap(dma_buf, dma_len);
- dma_buf = NULL;
- }
- if ( audio_fd >= 0 ) {
- close(audio_fd);
- audio_fd = -1;
- }
-}
-
-static int DMA_ReopenAudio(_THIS, const char *audiodev, int format, int stereo,
- SDL_AudioSpec *spec)
-{
- int frag_spec;
- int value;
-
- /* Close and then reopen the audio device */
- close(audio_fd);
- audio_fd = open(audiodev, O_RDWR, 0);
- if ( audio_fd < 0 ) {
- SDL_SetError("Couldn't open %s: %s", audiodev, strerror(errno));
- return(-1);
- }
-
- /* 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);
- }
-
- /* Set the audio buffering parameters */
- if ( ioctl(audio_fd, SNDCTL_DSP_SETFRAGMENT, &frag_spec) < 0 ) {
- SDL_SetError("Couldn't set audio fragment spec");
- return(-1);
- }
-
- /* Set the audio format */
- value = format;
- if ( (ioctl(audio_fd, SNDCTL_DSP_SETFMT, &value) < 0) ||
- (value != format) ) {
- SDL_SetError("Couldn't set audio format");
- return(-1);
- }
-
- /* Set mono or stereo audio */
- value = (spec->channels > 1);
- if ( (ioctl(audio_fd, SNDCTL_DSP_STEREO, &stereo) < 0) ||
- (value != stereo) ) {
- SDL_SetError("Couldn't set audio channels");
- return(-1);
- }
-
- /* Set the DSP frequency */
- value = spec->freq;
- if ( ioctl(audio_fd, SNDCTL_DSP_SPEED, &value) < 0 ) {
- SDL_SetError("Couldn't set audio frequency");
- return(-1);
- }
- spec->freq = value;
-
- /* We successfully re-opened the audio */
- return(0);
-}
-
-static int DMA_OpenAudio(_THIS, SDL_AudioSpec *spec)
-{
- char audiodev[1024];
- int format;
- int stereo;
- int value;
- Uint16 test_format;
- struct audio_buf_info info;
-
- /* 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);
- }
- dma_buf = NULL;
- ioctl(audio_fd, SNDCTL_DSP_RESET, 0);
-
- /* Get a list of supported hardware formats */
- if ( ioctl(audio_fd, SNDCTL_DSP_GETFMTS, &value) < 0 ) {
- SDL_SetError("Couldn't get audio format list");
- return(-1);
- }
-
- /* 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:
- if ( value & AFMT_U8 ) {
- format = AFMT_U8;
- }
- break;
- case AUDIO_S8:
- if ( value & AFMT_S8 ) {
- format = AFMT_S8;
- }
- break;
- case AUDIO_S16LSB:
- if ( value & AFMT_S16_LE ) {
- format = AFMT_S16_LE;
- }
- break;
- case AUDIO_S16MSB:
- if ( value & AFMT_S16_BE ) {
- format = AFMT_S16_BE;
- }
- break;
- case AUDIO_U16LSB:
- if ( value & AFMT_U16_LE ) {
- format = AFMT_U16_LE;
- }
- break;
- case AUDIO_U16MSB:
- if ( value & AFMT_U16_BE ) {
- format = AFMT_U16_BE;
- }
- 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;
-
- /* Set the audio format */
- value = format;
- if ( (ioctl(audio_fd, SNDCTL_DSP_SETFMT, &value) < 0) ||
- (value != format) ) {
- SDL_SetError("Couldn't set audio format");
- return(-1);
- }
-
- /* Set mono or stereo audio (currently only two channels supported) */
- stereo = (spec->channels > 1);
- ioctl(audio_fd, SNDCTL_DSP_STEREO, &stereo);
- if ( stereo ) {
- spec->channels = 2;
- } else {
- spec->channels = 1;
- }
-
- /* Because some drivers don't allow setting the buffer size
- after setting the format, we must re-open the audio device
- once we know what format and channels are supported
- */
- if ( DMA_ReopenAudio(this, audiodev, format, stereo, spec) < 0 ) {
- /* Error is set by DMA_ReopenAudio() */
- return(-1);
- }
-
- /* Memory map the audio buffer */
- if ( ioctl(audio_fd, SNDCTL_DSP_GETOSPACE, &info) < 0 ) {
- SDL_SetError("Couldn't get OSPACE parameters");
- return(-1);
- }
- spec->size = info.fragsize;
- spec->samples = spec->size / ((spec->format & 0xFF) / 8);
- spec->samples /= spec->channels;
- num_buffers = info.fragstotal;
- dma_len = num_buffers*spec->size;
- dma_buf = (Uint8 *)mmap(NULL, dma_len, PROT_WRITE, MAP_SHARED,
- audio_fd, 0);
- if ( dma_buf == MAP_FAILED ) {
- SDL_SetError("DMA memory map failed");
- dma_buf = NULL;
- return(-1);
- }
- SDL_memset(dma_buf, spec->silence, dma_len);
-
- /* 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;
- }
- }
-
- /* Trigger audio playback */
- value = 0;
- ioctl(audio_fd, SNDCTL_DSP_SETTRIGGER, &value);
- value = PCM_ENABLE_OUTPUT;
- if ( ioctl(audio_fd, SNDCTL_DSP_SETTRIGGER, &value) < 0 ) {
- SDL_SetError("Couldn't trigger audio output");
- return(-1);
- }
-
- /* Get the parent process id (we're the parent of the audio thread) */
- parent = getpid();
-
- /* We're ready to rock and roll. :-) */
- return(0);
-}
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