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-rw-r--r--qemu/audio/sdlaudio.c466
1 files changed, 466 insertions, 0 deletions
diff --git a/qemu/audio/sdlaudio.c b/qemu/audio/sdlaudio.c
new file mode 100644
index 000000000..1140f2ea0
--- /dev/null
+++ b/qemu/audio/sdlaudio.c
@@ -0,0 +1,466 @@
+/*
+ * QEMU SDL audio driver
+ *
+ * Copyright (c) 2004-2005 Vassili Karpov (malc)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#include <SDL.h>
+#include <SDL_thread.h>
+#include "qemu-common.h"
+#include "audio.h"
+
+#ifndef _WIN32
+#ifdef __sun__
+#define _POSIX_PTHREAD_SEMANTICS 1
+#elif defined(__OpenBSD__) || defined(__FreeBSD__) || defined(__DragonFly__)
+#include <pthread.h>
+#endif
+#endif
+
+#define AUDIO_CAP "sdl"
+#include "audio_int.h"
+
+typedef struct SDLVoiceOut {
+ HWVoiceOut hw;
+ int live;
+ int rpos;
+ int decr;
+} SDLVoiceOut;
+
+static struct {
+ int nb_samples;
+} conf = {
+ .nb_samples = 1024
+};
+
+static struct SDLAudioState {
+ int exit;
+ SDL_mutex *mutex;
+ SDL_sem *sem;
+ int initialized;
+ bool driver_created;
+} glob_sdl;
+typedef struct SDLAudioState SDLAudioState;
+
+static void GCC_FMT_ATTR (1, 2) sdl_logerr (const char *fmt, ...)
+{
+ va_list ap;
+
+ va_start (ap, fmt);
+ AUD_vlog (AUDIO_CAP, fmt, ap);
+ va_end (ap);
+
+ AUD_log (AUDIO_CAP, "Reason: %s\n", SDL_GetError ());
+}
+
+static int sdl_lock (SDLAudioState *s, const char *forfn)
+{
+ if (SDL_LockMutex (s->mutex)) {
+ sdl_logerr ("SDL_LockMutex for %s failed\n", forfn);
+ return -1;
+ }
+ return 0;
+}
+
+static int sdl_unlock (SDLAudioState *s, const char *forfn)
+{
+ if (SDL_UnlockMutex (s->mutex)) {
+ sdl_logerr ("SDL_UnlockMutex for %s failed\n", forfn);
+ return -1;
+ }
+ return 0;
+}
+
+static int sdl_post (SDLAudioState *s, const char *forfn)
+{
+ if (SDL_SemPost (s->sem)) {
+ sdl_logerr ("SDL_SemPost for %s failed\n", forfn);
+ return -1;
+ }
+ return 0;
+}
+
+static int sdl_wait (SDLAudioState *s, const char *forfn)
+{
+ if (SDL_SemWait (s->sem)) {
+ sdl_logerr ("SDL_SemWait for %s failed\n", forfn);
+ return -1;
+ }
+ return 0;
+}
+
+static int sdl_unlock_and_post (SDLAudioState *s, const char *forfn)
+{
+ if (sdl_unlock (s, forfn)) {
+ return -1;
+ }
+
+ return sdl_post (s, forfn);
+}
+
+static int aud_to_sdlfmt (audfmt_e fmt)
+{
+ switch (fmt) {
+ case AUD_FMT_S8:
+ return AUDIO_S8;
+
+ case AUD_FMT_U8:
+ return AUDIO_U8;
+
+ case AUD_FMT_S16:
+ return AUDIO_S16LSB;
+
+ case AUD_FMT_U16:
+ return AUDIO_U16LSB;
+
+ default:
+ dolog ("Internal logic error: Bad audio format %d\n", fmt);
+#ifdef DEBUG_AUDIO
+ abort ();
+#endif
+ return AUDIO_U8;
+ }
+}
+
+static int sdl_to_audfmt(int sdlfmt, audfmt_e *fmt, int *endianness)
+{
+ switch (sdlfmt) {
+ case AUDIO_S8:
+ *endianness = 0;
+ *fmt = AUD_FMT_S8;
+ break;
+
+ case AUDIO_U8:
+ *endianness = 0;
+ *fmt = AUD_FMT_U8;
+ break;
+
+ case AUDIO_S16LSB:
+ *endianness = 0;
+ *fmt = AUD_FMT_S16;
+ break;
+
+ case AUDIO_U16LSB:
+ *endianness = 0;
+ *fmt = AUD_FMT_U16;
+ break;
+
+ case AUDIO_S16MSB:
+ *endianness = 1;
+ *fmt = AUD_FMT_S16;
+ break;
+
+ case AUDIO_U16MSB:
+ *endianness = 1;
+ *fmt = AUD_FMT_U16;
+ break;
+
+ default:
+ dolog ("Unrecognized SDL audio format %d\n", sdlfmt);
+ return -1;
+ }
+
+ return 0;
+}
+
+static int sdl_open (SDL_AudioSpec *req, SDL_AudioSpec *obt)
+{
+ int status;
+#ifndef _WIN32
+ int err;
+ sigset_t new, old;
+
+ /* Make sure potential threads created by SDL don't hog signals. */
+ err = sigfillset (&new);
+ if (err) {
+ dolog ("sdl_open: sigfillset failed: %s\n", strerror (errno));
+ return -1;
+ }
+ err = pthread_sigmask (SIG_BLOCK, &new, &old);
+ if (err) {
+ dolog ("sdl_open: pthread_sigmask failed: %s\n", strerror (err));
+ return -1;
+ }
+#endif
+
+ status = SDL_OpenAudio (req, obt);
+ if (status) {
+ sdl_logerr ("SDL_OpenAudio failed\n");
+ }
+
+#ifndef _WIN32
+ err = pthread_sigmask (SIG_SETMASK, &old, NULL);
+ if (err) {
+ dolog ("sdl_open: pthread_sigmask (restore) failed: %s\n",
+ strerror (errno));
+ /* We have failed to restore original signal mask, all bets are off,
+ so exit the process */
+ exit (EXIT_FAILURE);
+ }
+#endif
+ return status;
+}
+
+static void sdl_close (SDLAudioState *s)
+{
+ if (s->initialized) {
+ sdl_lock (s, "sdl_close");
+ s->exit = 1;
+ sdl_unlock_and_post (s, "sdl_close");
+ SDL_PauseAudio (1);
+ SDL_CloseAudio ();
+ s->initialized = 0;
+ }
+}
+
+static void sdl_callback (void *opaque, Uint8 *buf, int len)
+{
+ SDLVoiceOut *sdl = opaque;
+ SDLAudioState *s = &glob_sdl;
+ HWVoiceOut *hw = &sdl->hw;
+ int samples = len >> hw->info.shift;
+
+ if (s->exit) {
+ return;
+ }
+
+ while (samples) {
+ int to_mix, decr;
+
+ /* dolog ("in callback samples=%d\n", samples); */
+ sdl_wait (s, "sdl_callback");
+ if (s->exit) {
+ return;
+ }
+
+ if (sdl_lock (s, "sdl_callback")) {
+ return;
+ }
+
+ if (audio_bug (AUDIO_FUNC, sdl->live < 0 || sdl->live > hw->samples)) {
+ dolog ("sdl->live=%d hw->samples=%d\n",
+ sdl->live, hw->samples);
+ return;
+ }
+
+ if (!sdl->live) {
+ goto again;
+ }
+
+ /* dolog ("in callback live=%d\n", live); */
+ to_mix = audio_MIN (samples, sdl->live);
+ decr = to_mix;
+ while (to_mix) {
+ int chunk = audio_MIN (to_mix, hw->samples - hw->rpos);
+ struct st_sample *src = hw->mix_buf + hw->rpos;
+
+ /* dolog ("in callback to_mix %d, chunk %d\n", to_mix, chunk); */
+ hw->clip (buf, src, chunk);
+ sdl->rpos = (sdl->rpos + chunk) % hw->samples;
+ to_mix -= chunk;
+ buf += chunk << hw->info.shift;
+ }
+ samples -= decr;
+ sdl->live -= decr;
+ sdl->decr += decr;
+
+ again:
+ if (sdl_unlock (s, "sdl_callback")) {
+ return;
+ }
+ }
+ /* dolog ("done len=%d\n", len); */
+}
+
+static int sdl_write_out (SWVoiceOut *sw, void *buf, int len)
+{
+ return audio_pcm_sw_write (sw, buf, len);
+}
+
+static int sdl_run_out (HWVoiceOut *hw, int live)
+{
+ int decr;
+ SDLVoiceOut *sdl = (SDLVoiceOut *) hw;
+ SDLAudioState *s = &glob_sdl;
+
+ if (sdl_lock (s, "sdl_run_out")) {
+ return 0;
+ }
+
+ if (sdl->decr > live) {
+ ldebug ("sdl->decr %d live %d sdl->live %d\n",
+ sdl->decr,
+ live,
+ sdl->live);
+ }
+
+ decr = audio_MIN (sdl->decr, live);
+ sdl->decr -= decr;
+
+ sdl->live = live - decr;
+ hw->rpos = sdl->rpos;
+
+ if (sdl->live > 0) {
+ sdl_unlock_and_post (s, "sdl_run_out");
+ }
+ else {
+ sdl_unlock (s, "sdl_run_out");
+ }
+ return decr;
+}
+
+static void sdl_fini_out (HWVoiceOut *hw)
+{
+ (void) hw;
+
+ sdl_close (&glob_sdl);
+}
+
+static int sdl_init_out(HWVoiceOut *hw, struct audsettings *as,
+ void *drv_opaque)
+{
+ SDLVoiceOut *sdl = (SDLVoiceOut *) hw;
+ SDLAudioState *s = &glob_sdl;
+ SDL_AudioSpec req, obt;
+ int endianness;
+ int err;
+ audfmt_e effective_fmt;
+ struct audsettings obt_as;
+
+ req.freq = as->freq;
+ req.format = aud_to_sdlfmt (as->fmt);
+ req.channels = as->nchannels;
+ req.samples = conf.nb_samples;
+ req.callback = sdl_callback;
+ req.userdata = sdl;
+
+ if (sdl_open (&req, &obt)) {
+ return -1;
+ }
+
+ err = sdl_to_audfmt(obt.format, &effective_fmt, &endianness);
+ if (err) {
+ sdl_close (s);
+ return -1;
+ }
+
+ obt_as.freq = obt.freq;
+ obt_as.nchannels = obt.channels;
+ obt_as.fmt = effective_fmt;
+ obt_as.endianness = endianness;
+
+ audio_pcm_init_info (&hw->info, &obt_as);
+ hw->samples = obt.samples;
+
+ s->initialized = 1;
+ s->exit = 0;
+ SDL_PauseAudio (0);
+ return 0;
+}
+
+static int sdl_ctl_out (HWVoiceOut *hw, int cmd, ...)
+{
+ (void) hw;
+
+ switch (cmd) {
+ case VOICE_ENABLE:
+ SDL_PauseAudio (0);
+ break;
+
+ case VOICE_DISABLE:
+ SDL_PauseAudio (1);
+ break;
+ }
+ return 0;
+}
+
+static void *sdl_audio_init (void)
+{
+ SDLAudioState *s = &glob_sdl;
+ if (s->driver_created) {
+ sdl_logerr("Can't create multiple sdl backends\n");
+ return NULL;
+ }
+
+ if (SDL_InitSubSystem (SDL_INIT_AUDIO)) {
+ sdl_logerr ("SDL failed to initialize audio subsystem\n");
+ return NULL;
+ }
+
+ s->mutex = SDL_CreateMutex ();
+ if (!s->mutex) {
+ sdl_logerr ("Failed to create SDL mutex\n");
+ SDL_QuitSubSystem (SDL_INIT_AUDIO);
+ return NULL;
+ }
+
+ s->sem = SDL_CreateSemaphore (0);
+ if (!s->sem) {
+ sdl_logerr ("Failed to create SDL semaphore\n");
+ SDL_DestroyMutex (s->mutex);
+ SDL_QuitSubSystem (SDL_INIT_AUDIO);
+ return NULL;
+ }
+
+ s->driver_created = true;
+ return s;
+}
+
+static void sdl_audio_fini (void *opaque)
+{
+ SDLAudioState *s = opaque;
+ sdl_close (s);
+ SDL_DestroySemaphore (s->sem);
+ SDL_DestroyMutex (s->mutex);
+ SDL_QuitSubSystem (SDL_INIT_AUDIO);
+ s->driver_created = false;
+}
+
+static struct audio_option sdl_options[] = {
+ {
+ .name = "SAMPLES",
+ .tag = AUD_OPT_INT,
+ .valp = &conf.nb_samples,
+ .descr = "Size of SDL buffer in samples"
+ },
+ { /* End of list */ }
+};
+
+static struct audio_pcm_ops sdl_pcm_ops = {
+ .init_out = sdl_init_out,
+ .fini_out = sdl_fini_out,
+ .run_out = sdl_run_out,
+ .write = sdl_write_out,
+ .ctl_out = sdl_ctl_out,
+};
+
+struct audio_driver sdl_audio_driver = {
+ .name = "sdl",
+ .descr = "SDL http://www.libsdl.org",
+ .options = sdl_options,
+ .init = sdl_audio_init,
+ .fini = sdl_audio_fini,
+ .pcm_ops = &sdl_pcm_ops,
+ .can_be_default = 1,
+ .max_voices_out = 1,
+ .max_voices_in = 0,
+ .voice_size_out = sizeof (SDLVoiceOut),
+ .voice_size_in = 0
+};