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Diffstat (limited to 'distrib/sdl-1.2.15/src/audio/nto/SDL_nto_audio.c')
-rw-r--r--distrib/sdl-1.2.15/src/audio/nto/SDL_nto_audio.c507
1 files changed, 507 insertions, 0 deletions
diff --git a/distrib/sdl-1.2.15/src/audio/nto/SDL_nto_audio.c b/distrib/sdl-1.2.15/src/audio/nto/SDL_nto_audio.c
new file mode 100644
index 0000000..f951825
--- /dev/null
+++ b/distrib/sdl-1.2.15/src/audio/nto/SDL_nto_audio.c
@@ -0,0 +1,507 @@
+/*
+ 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 Library General Public
+ License as published by the Free Software Foundation; either
+ version 2 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
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with this library; if not, write to the Free
+ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+ Sam Lantinga
+ slouken@libsdl.org
+*/
+#include "SDL_config.h"
+
+#include <errno.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <sys/types.h>
+#include <sys/time.h>
+#include <sched.h>
+#include <sys/select.h>
+#include <sys/neutrino.h>
+#include <sys/asoundlib.h>
+
+#include "SDL_timer.h"
+#include "SDL_audio.h"
+#include "../SDL_audiomem.h"
+#include "../SDL_audio_c.h"
+#include "SDL_nto_audio.h"
+
+/* The tag name used by NTO audio */
+#define DRIVER_NAME "qsa-nto"
+
+/* default channel communication parameters */
+#define DEFAULT_CPARAMS_RATE 22050
+#define DEFAULT_CPARAMS_VOICES 1
+/* FIXME: need to add in the near future flexible logic with frag_size and frags count */
+#define DEFAULT_CPARAMS_FRAG_SIZE 4096
+#define DEFAULT_CPARAMS_FRAGS_MIN 1
+#define DEFAULT_CPARAMS_FRAGS_MAX 1
+
+/* Open the audio device for playback, and don't block if busy */
+#define OPEN_FLAGS SND_PCM_OPEN_PLAYBACK
+
+#define QSA_NO_WORKAROUNDS 0x00000000
+#define QSA_MMAP_WORKAROUND 0x00000001
+
+struct BuggyCards
+{
+ char* cardname;
+ unsigned long bugtype;
+};
+
+#define QSA_WA_CARDS 3
+
+struct BuggyCards buggycards[QSA_WA_CARDS]=
+{
+ {"Sound Blaster Live!", QSA_MMAP_WORKAROUND},
+ {"Vortex 8820", QSA_MMAP_WORKAROUND},
+ {"Vortex 8830", QSA_MMAP_WORKAROUND},
+};
+
+/* Audio driver functions */
+static void NTO_ThreadInit(_THIS);
+static int NTO_OpenAudio(_THIS, SDL_AudioSpec* spec);
+static void NTO_WaitAudio(_THIS);
+static void NTO_PlayAudio(_THIS);
+static Uint8* NTO_GetAudioBuf(_THIS);
+static void NTO_CloseAudio(_THIS);
+
+/* card names check to apply the workarounds */
+static int NTO_CheckBuggyCards(_THIS, unsigned long checkfor)
+{
+ char scardname[33];
+ int it;
+
+ if (snd_card_get_name(cardno, scardname, 32)<0)
+ {
+ return 0;
+ }
+
+ for (it=0; it<QSA_WA_CARDS; it++)
+ {
+ if (SDL_strcmp(buggycards[it].cardname, scardname)==0)
+ {
+ if (buggycards[it].bugtype==checkfor)
+ {
+ return 1;
+ }
+ }
+ }
+
+ return 0;
+}
+
+static void NTO_ThreadInit(_THIS)
+{
+ int status;
+ struct sched_param param;
+
+ /* increasing default 10 priority to 25 to avoid jerky sound */
+ status=SchedGet(0, 0, &param);
+ param.sched_priority=param.sched_curpriority+15;
+ status=SchedSet(0, 0, SCHED_NOCHANGE, &param);
+}
+
+/* PCM transfer channel parameters initialize function */
+static void NTO_InitAudioParams(snd_pcm_channel_params_t* cpars)
+{
+ SDL_memset(cpars, 0, sizeof(snd_pcm_channel_params_t));
+
+ cpars->channel = SND_PCM_CHANNEL_PLAYBACK;
+ cpars->mode = SND_PCM_MODE_BLOCK;
+ cpars->start_mode = SND_PCM_START_DATA;
+ cpars->stop_mode = SND_PCM_STOP_STOP;
+ cpars->format.format = SND_PCM_SFMT_S16_LE;
+ cpars->format.interleave = 1;
+ cpars->format.rate = DEFAULT_CPARAMS_RATE;
+ cpars->format.voices = DEFAULT_CPARAMS_VOICES;
+ cpars->buf.block.frag_size = DEFAULT_CPARAMS_FRAG_SIZE;
+ cpars->buf.block.frags_min = DEFAULT_CPARAMS_FRAGS_MIN;
+ cpars->buf.block.frags_max = DEFAULT_CPARAMS_FRAGS_MAX;
+}
+
+static int NTO_AudioAvailable(void)
+{
+ /* See if we can open a nonblocking channel.
+ Return value '1' means we can.
+ Return value '0' means we cannot. */
+
+ int available;
+ int rval;
+ snd_pcm_t* handle;
+
+ available = 0;
+ handle = NULL;
+
+ rval = snd_pcm_open_preferred(&handle, NULL, NULL, OPEN_FLAGS);
+
+ if (rval >= 0)
+ {
+ available = 1;
+
+ if ((rval = snd_pcm_close(handle)) < 0)
+ {
+ SDL_SetError("NTO_AudioAvailable(): snd_pcm_close failed: %s\n", snd_strerror(rval));
+ available = 0;
+ }
+ }
+ else
+ {
+ SDL_SetError("NTO_AudioAvailable(): there are no available audio devices.\n");
+ }
+
+ return (available);
+}
+
+static void NTO_DeleteAudioDevice(SDL_AudioDevice *device)
+{
+ if ((device)&&(device->hidden))
+ {
+ SDL_free(device->hidden);
+ }
+ if (device)
+ {
+ SDL_free(device);
+ }
+}
+
+static SDL_AudioDevice* NTO_CreateAudioDevice(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(SDL_AudioDevice));
+ this->hidden = (struct SDL_PrivateAudioData *)SDL_malloc(sizeof(struct SDL_PrivateAudioData));
+ }
+ if ((this == NULL) || (this->hidden == NULL))
+ {
+ SDL_OutOfMemory();
+ if (this)
+ {
+ SDL_free(this);
+ }
+ return (0);
+ }
+ SDL_memset(this->hidden, 0, sizeof(struct SDL_PrivateAudioData));
+ audio_handle = NULL;
+
+ /* Set the function pointers */
+ this->ThreadInit = NTO_ThreadInit;
+ this->OpenAudio = NTO_OpenAudio;
+ this->WaitAudio = NTO_WaitAudio;
+ this->PlayAudio = NTO_PlayAudio;
+ this->GetAudioBuf = NTO_GetAudioBuf;
+ this->CloseAudio = NTO_CloseAudio;
+
+ this->free = NTO_DeleteAudioDevice;
+
+ return this;
+}
+
+AudioBootStrap QNXNTOAUDIO_bootstrap =
+{
+ DRIVER_NAME, "QNX6 QSA-NTO Audio",
+ NTO_AudioAvailable,
+ NTO_CreateAudioDevice
+};
+
+/* This function waits until it is possible to write a full sound buffer */
+static void NTO_WaitAudio(_THIS)
+{
+ fd_set wfds;
+ int selectret;
+
+ FD_ZERO(&wfds);
+ FD_SET(audio_fd, &wfds);
+
+ do {
+ selectret=select(audio_fd + 1, NULL, &wfds, NULL, NULL);
+ switch (selectret)
+ {
+ case -1:
+ case 0: SDL_SetError("NTO_WaitAudio(): select() failed: %s\n", strerror(errno));
+ return;
+ default: if (FD_ISSET(audio_fd, &wfds))
+ {
+ return;
+ }
+ break;
+ }
+ } while(1);
+}
+
+static void NTO_PlayAudio(_THIS)
+{
+ int written, rval;
+ int towrite;
+ void* pcmbuffer;
+
+ if (!this->enabled)
+ {
+ return;
+ }
+
+ towrite = this->spec.size;
+ pcmbuffer = pcm_buf;
+
+ /* Write the audio data, checking for EAGAIN (buffer full) and underrun */
+ do {
+ written = snd_pcm_plugin_write(audio_handle, pcm_buf, towrite);
+ if (written != towrite)
+ {
+ if ((errno == EAGAIN) || (errno == EWOULDBLOCK))
+ {
+ /* Let a little CPU time go by and try to write again */
+ SDL_Delay(1);
+ /* if we wrote some data */
+ towrite -= written;
+ pcmbuffer += written * this->spec.channels;
+ continue;
+ }
+ else
+ {
+ if ((errno == EINVAL) || (errno == EIO))
+ {
+ SDL_memset(&cstatus, 0, sizeof(cstatus));
+ cstatus.channel = SND_PCM_CHANNEL_PLAYBACK;
+ if ((rval = snd_pcm_plugin_status(audio_handle, &cstatus)) < 0)
+ {
+ SDL_SetError("NTO_PlayAudio(): snd_pcm_plugin_status failed: %s\n", snd_strerror(rval));
+ return;
+ }
+ if ((cstatus.status == SND_PCM_STATUS_UNDERRUN) || (cstatus.status == SND_PCM_STATUS_READY))
+ {
+ if ((rval = snd_pcm_plugin_prepare(audio_handle, SND_PCM_CHANNEL_PLAYBACK)) < 0)
+ {
+ SDL_SetError("NTO_PlayAudio(): snd_pcm_plugin_prepare failed: %s\n", snd_strerror(rval));
+ return;
+ }
+ }
+ continue;
+ }
+ else
+ {
+ return;
+ }
+ }
+ }
+ else
+ {
+ /* we wrote all remaining data */
+ towrite -= written;
+ pcmbuffer += written * this->spec.channels;
+ }
+ } while ((towrite > 0) && (this->enabled));
+
+ /* If we couldn't write, assume fatal error for now */
+ if (towrite != 0)
+ {
+ this->enabled = 0;
+ }
+
+ return;
+}
+
+static Uint8* NTO_GetAudioBuf(_THIS)
+{
+ return pcm_buf;
+}
+
+static void NTO_CloseAudio(_THIS)
+{
+ int rval;
+
+ this->enabled = 0;
+
+ if (audio_handle != NULL)
+ {
+ if ((rval = snd_pcm_plugin_flush(audio_handle, SND_PCM_CHANNEL_PLAYBACK)) < 0)
+ {
+ SDL_SetError("NTO_CloseAudio(): snd_pcm_plugin_flush failed: %s\n", snd_strerror(rval));
+ return;
+ }
+ if ((rval = snd_pcm_close(audio_handle)) < 0)
+ {
+ SDL_SetError("NTO_CloseAudio(): snd_pcm_close failed: %s\n",snd_strerror(rval));
+ return;
+ }
+ audio_handle = NULL;
+ }
+}
+
+static int NTO_OpenAudio(_THIS, SDL_AudioSpec* spec)
+{
+ int rval;
+ int format;
+ Uint16 test_format;
+ int found;
+
+ audio_handle = NULL;
+ this->enabled = 0;
+
+ if (pcm_buf != NULL)
+ {
+ SDL_FreeAudioMem(pcm_buf);
+ pcm_buf = NULL;
+ }
+
+ /* initialize channel transfer parameters to default */
+ NTO_InitAudioParams(&cparams);
+
+ /* Open the audio device */
+ rval = snd_pcm_open_preferred(&audio_handle, &cardno, &deviceno, OPEN_FLAGS);
+ if (rval < 0)
+ {
+ SDL_SetError("NTO_OpenAudio(): snd_pcm_open failed: %s\n", snd_strerror(rval));
+ return (-1);
+ }
+
+ if (!NTO_CheckBuggyCards(this, QSA_MMAP_WORKAROUND))
+ {
+ /* enable count status parameter */
+ if ((rval = snd_pcm_plugin_set_disable(audio_handle, PLUGIN_DISABLE_MMAP)) < 0)
+ {
+ SDL_SetError("snd_pcm_plugin_set_disable failed: %s\n", snd_strerror(rval));
+ return (-1);
+ }
+ }
+
+ /* Try for a closest match on audio format */
+ format = 0;
+ /* can't use format as SND_PCM_SFMT_U8 = 0 in nto */
+ found = 0;
+
+ for (test_format=SDL_FirstAudioFormat(spec->format); !found ;)
+ {
+ /* if match found set format to equivalent ALSA format */
+ switch (test_format)
+ {
+ case AUDIO_U8:
+ format = SND_PCM_SFMT_U8;
+ found = 1;
+ break;
+ case AUDIO_S8:
+ format = SND_PCM_SFMT_S8;
+ found = 1;
+ break;
+ case AUDIO_S16LSB:
+ format = SND_PCM_SFMT_S16_LE;
+ found = 1;
+ break;
+ case AUDIO_S16MSB:
+ format = SND_PCM_SFMT_S16_BE;
+ found = 1;
+ break;
+ case AUDIO_U16LSB:
+ format = SND_PCM_SFMT_U16_LE;
+ found = 1;
+ break;
+ case AUDIO_U16MSB:
+ format = SND_PCM_SFMT_U16_BE;
+ found = 1;
+ break;
+ default:
+ break;
+ }
+
+ if (!found)
+ {
+ test_format = SDL_NextAudioFormat();
+ }
+ }
+
+ /* assumes test_format not 0 on success */
+ if (test_format == 0)
+ {
+ SDL_SetError("NTO_OpenAudio(): Couldn't find any hardware audio formats");
+ return (-1);
+ }
+
+ spec->format = test_format;
+
+ /* Set the audio format */
+ cparams.format.format = format;
+
+ /* Set mono or stereo audio (currently only two channels supported) */
+ cparams.format.voices = spec->channels;
+
+ /* Set rate */
+ cparams.format.rate = spec->freq;
+
+ /* Setup the transfer parameters according to cparams */
+ rval = snd_pcm_plugin_params(audio_handle, &cparams);
+ if (rval < 0)
+ {
+ SDL_SetError("NTO_OpenAudio(): snd_pcm_channel_params failed: %s\n", snd_strerror(rval));
+ return (-1);
+ }
+
+ /* Make sure channel is setup right one last time */
+ SDL_memset(&csetup, 0x00, sizeof(csetup));
+ csetup.channel = SND_PCM_CHANNEL_PLAYBACK;
+ if (snd_pcm_plugin_setup(audio_handle, &csetup) < 0)
+ {
+ SDL_SetError("NTO_OpenAudio(): Unable to setup playback channel\n");
+ return -1;
+ }
+
+
+ /* Calculate the final parameters for this audio specification */
+ SDL_CalculateAudioSpec(spec);
+
+ pcm_len = spec->size;
+
+ if (pcm_len==0)
+ {
+ pcm_len = csetup.buf.block.frag_size * spec->channels * (snd_pcm_format_width(format)/8);
+ }
+
+ /* Allocate memory to the audio buffer and initialize with silence (Note that
+ buffer size must be a multiple of fragment size, so find closest multiple)
+ */
+ pcm_buf = (Uint8*)SDL_AllocAudioMem(pcm_len);
+ if (pcm_buf == NULL)
+ {
+ SDL_SetError("NTO_OpenAudio(): pcm buffer allocation failed\n");
+ return (-1);
+ }
+ SDL_memset(pcm_buf, spec->silence, pcm_len);
+
+ /* get the file descriptor */
+ if ((audio_fd = snd_pcm_file_descriptor(audio_handle, SND_PCM_CHANNEL_PLAYBACK)) < 0)
+ {
+ SDL_SetError("NTO_OpenAudio(): snd_pcm_file_descriptor failed with error code: %s\n", snd_strerror(rval));
+ return (-1);
+ }
+
+ /* Trigger audio playback */
+ rval = snd_pcm_plugin_prepare(audio_handle, SND_PCM_CHANNEL_PLAYBACK);
+ if (rval < 0)
+ {
+ SDL_SetError("snd_pcm_plugin_prepare failed: %s\n", snd_strerror(rval));
+ return (-1);
+ }
+
+ this->enabled = 1;
+
+ /* Get the parent process id (we're the parent of the audio thread) */
+ parent = getpid();
+
+ /* We're really ready to rock and roll. :-) */
+ return (0);
+}
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