--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/symbian-qemu-0.9.1-12/libsdl-trunk/src/audio/dsp/SDL_dspaudio.c	Fri Jul 31 15:01:17 2009 +0100
@@ -0,0 +1,340 @@
+/*
+    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
+
+    Modified in Oct 2004 by Hannu Savolainen 
+    hannu@opensound.com
+*/
+#include "SDL_config.h"
+
+/* Allow access to a raw mixing buffer */
+
+#include <stdio.h>	/* For perror() */
+#include <string.h>	/* For strerror() */
+#include <errno.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <sys/time.h>
+#include <sys/ioctl.h>
+#include <sys/stat.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
+
+#include "SDL_timer.h"
+#include "SDL_audio.h"
+#include "../SDL_audiomem.h"
+#include "../SDL_audio_c.h"
+#include "../SDL_audiodev_c.h"
+#include "SDL_dspaudio.h"
+
+/* The tag name used by DSP audio */
+#define DSP_DRIVER_NAME         "dsp"
+
+/* Open the audio device for playback, and don't block if busy */
+#define OPEN_FLAGS	(O_WRONLY|O_NONBLOCK)
+
+/* Audio driver functions */
+static int DSP_OpenAudio(_THIS, SDL_AudioSpec *spec);
+static void DSP_WaitAudio(_THIS);
+static void DSP_PlayAudio(_THIS);
+static Uint8 *DSP_GetAudioBuf(_THIS);
+static void DSP_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 = DSP_OpenAudio;
+	this->WaitAudio = DSP_WaitAudio;
+	this->PlayAudio = DSP_PlayAudio;
+	this->GetAudioBuf = DSP_GetAudioBuf;
+	this->CloseAudio = DSP_CloseAudio;
+
+	this->free = Audio_DeleteDevice;
+
+	return this;
+}
+
+AudioBootStrap DSP_bootstrap = {
+	DSP_DRIVER_NAME, "OSS /dev/dsp standard audio",
+	Audio_Available, Audio_CreateDevice
+};
+
+/* This function waits until it is possible to write a full sound buffer */
+static void DSP_WaitAudio(_THIS)
+{
+	/* Not needed at all since OSS handles waiting automagically */
+}
+
+static void DSP_PlayAudio(_THIS)
+{
+	if (write(audio_fd, mixbuf, mixlen)==-1)
+	{
+		perror("Audio write");
+		this->enabled = 0;
+	}
+
+#ifdef DEBUG_AUDIO
+	fprintf(stderr, "Wrote %d bytes of audio data\n", mixlen);
+#endif
+}
+
+static Uint8 *DSP_GetAudioBuf(_THIS)
+{
+	return(mixbuf);
+}
+
+static void DSP_CloseAudio(_THIS)
+{
+	if ( mixbuf != NULL ) {
+		SDL_FreeAudioMem(mixbuf);
+		mixbuf = NULL;
+	}
+	if ( audio_fd >= 0 ) {
+		close(audio_fd);
+		audio_fd = -1;
+	}
+}
+
+static int DSP_OpenAudio(_THIS, SDL_AudioSpec *spec)
+{
+	char audiodev[1024];
+	int format;
+	int value;
+	int frag_spec;
+	Uint16 test_format;
+
+    /* Make sure fragment size stays a power of 2, or OSS fails. */
+    /* I don't know which of these are actually legal values, though... */
+    if (spec->channels > 8)
+        spec->channels = 8;
+    else if (spec->channels > 4)
+        spec->channels = 4;
+    else if (spec->channels > 2)
+        spec->channels = 2;
+
+	/* 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);
+	}
+	mixbuf = NULL;
+
+	/* Make the file descriptor use blocking writes with fcntl() */
+	{ long flags;
+		flags = fcntl(audio_fd, F_GETFL);
+		flags &= ~O_NONBLOCK;
+		if ( fcntl(audio_fd, F_SETFL, flags) < 0 ) {
+			SDL_SetError("Couldn't set audio blocking mode");
+			DSP_CloseAudio(this);
+			return(-1);
+		}
+	}
+
+	/* Get a list of supported hardware formats */
+	if ( ioctl(audio_fd, SNDCTL_DSP_GETFMTS, &value) < 0 ) {
+		perror("SNDCTL_DSP_GETFMTS");
+		SDL_SetError("Couldn't get audio format list");
+		DSP_CloseAudio(this);
+		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_S16LSB:
+				if ( value & AFMT_S16_LE ) {
+					format = AFMT_S16_LE;
+				}
+				break;
+			case AUDIO_S16MSB:
+				if ( value & AFMT_S16_BE ) {
+					format = AFMT_S16_BE;
+				}
+				break;
+#if 0
+/*
+ * These formats are not used by any real life systems so they are not 
+ * needed here.
+ */
+			case AUDIO_S8:
+				if ( value & AFMT_S8 ) {
+					format = AFMT_S8;
+				}
+				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;
+#endif
+			default:
+				format = 0;
+				break;
+		}
+		if ( ! format ) {
+			test_format = SDL_NextAudioFormat();
+		}
+	}
+	if ( format == 0 ) {
+		SDL_SetError("Couldn't find any hardware audio formats");
+		DSP_CloseAudio(this);
+		return(-1);
+	}
+	spec->format = test_format;
+
+	/* Set the audio format */
+	value = format;
+	if ( (ioctl(audio_fd, SNDCTL_DSP_SETFMT, &value) < 0) ||
+						(value != format) ) {
+		perror("SNDCTL_DSP_SETFMT");
+		SDL_SetError("Couldn't set audio format");
+		DSP_CloseAudio(this);
+		return(-1);
+	}
+
+	/* Set the number of channels of output */
+	value = spec->channels;
+	if ( ioctl(audio_fd, SNDCTL_DSP_CHANNELS, &value) < 0 ) {
+		perror("SNDCTL_DSP_CHANNELS");
+		SDL_SetError("Cannot set the number of channels");
+		DSP_CloseAudio(this);
+		return(-1);
+	}
+	spec->channels = value;
+
+	/* Set the DSP frequency */
+	value = spec->freq;
+	if ( ioctl(audio_fd, SNDCTL_DSP_SPEED, &value) < 0 ) {
+		perror("SNDCTL_DSP_SPEED");
+		SDL_SetError("Couldn't set audio frequency");
+		DSP_CloseAudio(this);
+		return(-1);
+	}
+	spec->freq = value;
+
+	/* Calculate the final parameters for this audio specification */
+	SDL_CalculateAudioSpec(spec);
+
+	/* Determine the power of two of the fragment size */
+	for ( frag_spec = 0; (0x01U<<frag_spec) < spec->size; ++frag_spec );
+	if ( (0x01U<<frag_spec) != spec->size ) {
+		SDL_SetError("Fragment size must be a power of two");
+		DSP_CloseAudio(this);
+		return(-1);
+	}
+	frag_spec |= 0x00020000;	/* two fragments, for low latency */
+
+	/* Set the audio buffering parameters */
+#ifdef DEBUG_AUDIO
+	fprintf(stderr, "Requesting %d fragments of size %d\n",
+		(frag_spec >> 16), 1<<(frag_spec&0xFFFF));
+#endif
+	if ( ioctl(audio_fd, SNDCTL_DSP_SETFRAGMENT, &frag_spec) < 0 ) {
+		perror("SNDCTL_DSP_SETFRAGMENT");
+	}
+#ifdef DEBUG_AUDIO
+	{ audio_buf_info info;
+	  ioctl(audio_fd, SNDCTL_DSP_GETOSPACE, &info);
+	  fprintf(stderr, "fragments = %d\n", info.fragments);
+	  fprintf(stderr, "fragstotal = %d\n", info.fragstotal);
+	  fprintf(stderr, "fragsize = %d\n", info.fragsize);
+	  fprintf(stderr, "bytes = %d\n", info.bytes);
+	}
+#endif
+
+	/* Allocate mixing buffer */
+	mixlen = spec->size;
+	mixbuf = (Uint8 *)SDL_AllocAudioMem(mixlen);
+	if ( mixbuf == NULL ) {
+		DSP_CloseAudio(this);
+		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);
+}