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-rw-r--r--audio/sdlaudio.c323
1 files changed, 323 insertions, 0 deletions
diff --git a/audio/sdlaudio.c b/audio/sdlaudio.c
new file mode 100644
index 0000000000..4d75853422
--- /dev/null
+++ b/audio/sdlaudio.c
@@ -0,0 +1,323 @@
+/*
+ * QEMU SDL audio output driver
+ *
+ * Copyright (c) 2004 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/SDL.h>
+#include <SDL/SDL_thread.h>
+#include "vl.h"
+
+#define AUDIO_CAP "sdl"
+#include "audio/audio.h"
+#include "audio/sdlaudio.h"
+
+#define QC_SDL_SAMPLES "QEMU_SDL_SAMPLES"
+
+#define errstr() SDL_GetError ()
+
+static struct {
+ int nb_samples;
+} conf = {
+ 1024
+};
+
+struct SDLAudioState {
+ int exit;
+ SDL_mutex *mutex;
+ SDL_sem *sem;
+ int initialized;
+} glob_sdl;
+typedef struct SDLAudioState SDLAudioState;
+
+static void sdl_hw_run (HWVoice *hw)
+{
+ (void) hw;
+}
+
+static int sdl_lock (SDLAudioState *s)
+{
+ if (SDL_LockMutex (s->mutex)) {
+ dolog ("SDL_LockMutex failed\nReason: %s\n", errstr ());
+ return -1;
+ }
+ return 0;
+}
+
+static int sdl_unlock (SDLAudioState *s)
+{
+ if (SDL_UnlockMutex (s->mutex)) {
+ dolog ("SDL_UnlockMutex failed\nReason: %s\n", errstr ());
+ return -1;
+ }
+ return 0;
+}
+
+static int sdl_post (SDLAudioState *s)
+{
+ if (SDL_SemPost (s->sem)) {
+ dolog ("SDL_SemPost failed\nReason: %s\n", errstr ());
+ return -1;
+ }
+ return 0;
+}
+
+static int sdl_wait (SDLAudioState *s)
+{
+ if (SDL_SemWait (s->sem)) {
+ dolog ("SDL_SemWait failed\nReason: %s\n", errstr ());
+ return -1;
+ }
+ return 0;
+}
+
+static int sdl_unlock_and_post (SDLAudioState *s)
+{
+ if (sdl_unlock (s))
+ return -1;
+
+ return sdl_post (s);
+}
+
+static int sdl_hw_write (SWVoice *sw, void *buf, int len)
+{
+ int ret;
+ SDLAudioState *s = &glob_sdl;
+ sdl_lock (s);
+ ret = pcm_hw_write (sw, buf, len);
+ sdl_unlock_and_post (s);
+ return ret;
+}
+
+static int AUD_to_sdlfmt (audfmt_e fmt, int *shift)
+{
+ *shift = 0;
+ switch (fmt) {
+ case AUD_FMT_S8: return AUDIO_S8;
+ case AUD_FMT_U8: return AUDIO_U8;
+ case AUD_FMT_S16: *shift = 1; return AUDIO_S16LSB;
+ case AUD_FMT_U16: *shift = 1; return AUDIO_U16LSB;
+ default:
+ dolog ("Internal logic error: Bad audio format %d\nAborting\n", fmt);
+ exit (EXIT_FAILURE);
+ }
+}
+
+static int sdl_to_audfmt (int fmt)
+{
+ switch (fmt) {
+ case AUDIO_S8: return AUD_FMT_S8;
+ case AUDIO_U8: return AUD_FMT_U8;
+ case AUDIO_S16LSB: return AUD_FMT_S16;
+ case AUDIO_U16LSB: return AUD_FMT_U16;
+ default:
+ dolog ("Internal logic error: Unrecognized SDL audio format %d\n"
+ "Aborting\n", fmt);
+ exit (EXIT_FAILURE);
+ }
+}
+
+static int sdl_open (SDL_AudioSpec *req, SDL_AudioSpec *obt)
+{
+ int status;
+
+ status = SDL_OpenAudio (req, obt);
+ if (status) {
+ dolog ("SDL_OpenAudio failed\nReason: %s\n", errstr ());
+ }
+ return status;
+}
+
+static void sdl_close (SDLAudioState *s)
+{
+ if (s->initialized) {
+ sdl_lock (s);
+ s->exit = 1;
+ sdl_unlock_and_post (s);
+ SDL_PauseAudio (1);
+ SDL_CloseAudio ();
+ s->initialized = 0;
+ }
+}
+
+static void sdl_callback (void *opaque, Uint8 *buf, int len)
+{
+ SDLVoice *sdl = opaque;
+ SDLAudioState *s = &glob_sdl;
+ HWVoice *hw = &sdl->hw;
+ int samples = len >> hw->shift;
+
+ if (s->exit) {
+ return;
+ }
+
+ while (samples) {
+ int to_mix, live, decr;
+
+ /* dolog ("in callback samples=%d\n", samples); */
+ sdl_wait (s);
+ if (s->exit) {
+ return;
+ }
+
+ sdl_lock (s);
+ live = pcm_hw_get_live (hw);
+ if (live <= 0)
+ goto again;
+
+ /* dolog ("in callback live=%d\n", live); */
+ to_mix = audio_MIN (samples, live);
+ decr = to_mix;
+ while (to_mix) {
+ int chunk = audio_MIN (to_mix, hw->samples - hw->rpos);
+ st_sample_t *src = hw->mix_buf + hw->rpos;
+
+ /* dolog ("in callback to_mix %d, chunk %d\n", to_mix, chunk); */
+ hw->clip (buf, src, chunk);
+ memset (src, 0, chunk * sizeof (st_sample_t));
+ hw->rpos = (hw->rpos + chunk) % hw->samples;
+ to_mix -= chunk;
+ buf += chunk << hw->shift;
+ }
+ samples -= decr;
+ pcm_hw_dec_live (hw, decr);
+
+ again:
+ sdl_unlock (s);
+ }
+ /* dolog ("done len=%d\n", len); */
+}
+
+static void sdl_hw_fini (HWVoice *hw)
+{
+ ldebug ("sdl_hw_fini %d fixed=%d\n",
+ glob_sdl.initialized, audio_conf.fixed_format);
+ sdl_close (&glob_sdl);
+}
+
+static int sdl_hw_init (HWVoice *hw, int freq, int nchannels, audfmt_e fmt)
+{
+ SDLVoice *sdl = (SDLVoice *) hw;
+ SDLAudioState *s = &glob_sdl;
+ SDL_AudioSpec req, obt;
+ int shift;
+
+ ldebug ("sdl_hw_init %d freq=%d fixed=%d\n",
+ s->initialized, freq, audio_conf.fixed_format);
+
+ if (nchannels != 2) {
+ dolog ("Bogus channel count %d\n", nchannels);
+ return -1;
+ }
+
+ req.freq = freq;
+ req.format = AUD_to_sdlfmt (fmt, &shift);
+ req.channels = nchannels;
+ req.samples = conf.nb_samples;
+ shift <<= nchannels == 2;
+
+ req.callback = sdl_callback;
+ req.userdata = sdl;
+
+ if (sdl_open (&req, &obt))
+ return -1;
+
+ hw->freq = obt.freq;
+ hw->fmt = sdl_to_audfmt (obt.format);
+ hw->nchannels = obt.channels;
+ hw->bufsize = obt.samples << shift;
+
+ s->initialized = 1;
+ s->exit = 0;
+ SDL_PauseAudio (0);
+ return 0;
+}
+
+static int sdl_hw_ctl (HWVoice *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;
+ conf.nb_samples = audio_get_conf_int (QC_SDL_SAMPLES, conf.nb_samples);
+
+ if (SDL_InitSubSystem (SDL_INIT_AUDIO)) {
+ dolog ("SDL failed to initialize audio subsystem\nReason: %s\n",
+ errstr ());
+ return NULL;
+ }
+
+ s->mutex = SDL_CreateMutex ();
+ if (!s->mutex) {
+ dolog ("Failed to create SDL mutex\nReason: %s\n", errstr ());
+ SDL_QuitSubSystem (SDL_INIT_AUDIO);
+ return NULL;
+ }
+
+ s->sem = SDL_CreateSemaphore (0);
+ if (!s->sem) {
+ dolog ("Failed to create SDL semaphore\nReason: %s\n", errstr ());
+ SDL_DestroyMutex (s->mutex);
+ SDL_QuitSubSystem (SDL_INIT_AUDIO);
+ return NULL;
+ }
+
+ 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);
+}
+
+struct pcm_ops sdl_pcm_ops = {
+ sdl_hw_init,
+ sdl_hw_fini,
+ sdl_hw_run,
+ sdl_hw_write,
+ sdl_hw_ctl
+};
+
+struct audio_output_driver sdl_output_driver = {
+ "sdl",
+ sdl_audio_init,
+ sdl_audio_fini,
+ &sdl_pcm_ops,
+ 1,
+ 1,
+ sizeof (SDLVoice)
+};
generated by cgit v1.2.3 (git 2.26.2) at 2024-11-23 17:22:18 +0000