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authorTimos Ampelikiotis <t.ampelikiotis@virtualopensystems.com>2023-10-10 11:40:56 +0000
committerTimos Ampelikiotis <t.ampelikiotis@virtualopensystems.com>2023-10-10 11:40:56 +0000
commite02cda008591317b1625707ff8e115a4841aa889 (patch)
treeaee302e3cf8b59ec2d32ec481be3d1afddfc8968 /audio/sdlaudio.c
parentcc668e6b7e0ffd8c9d130513d12053cf5eda1d3b (diff)
Introduce Virtio-loopback epsilon release:
Epsilon release introduces a new compatibility layer which make virtio-loopback design to work with QEMU and rust-vmm vhost-user backend without require any changes. Signed-off-by: Timos Ampelikiotis <t.ampelikiotis@virtualopensystems.com> Change-Id: I52e57563e08a7d0bdc002f8e928ee61ba0c53dd9
Diffstat (limited to 'audio/sdlaudio.c')
-rw-r--r--audio/sdlaudio.c508
1 files changed, 508 insertions, 0 deletions
diff --git a/audio/sdlaudio.c b/audio/sdlaudio.c
new file mode 100644
index 000000000..c68c62a3e
--- /dev/null
+++ b/audio/sdlaudio.c
@@ -0,0 +1,508 @@
+/*
+ * 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 "qemu/osdep.h"
+#include <SDL.h>
+#include <SDL_thread.h>
+#include "qemu/module.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 exit;
+ int initialized;
+ Audiodev *dev;
+ SDL_AudioDeviceID devid;
+} SDLVoiceOut;
+
+typedef struct SDLVoiceIn {
+ HWVoiceIn hw;
+ int exit;
+ int initialized;
+ Audiodev *dev;
+ SDL_AudioDeviceID devid;
+} SDLVoiceIn;
+
+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 aud_to_sdlfmt (AudioFormat fmt)
+{
+ switch (fmt) {
+ case AUDIO_FORMAT_S8:
+ return AUDIO_S8;
+
+ case AUDIO_FORMAT_U8:
+ return AUDIO_U8;
+
+ case AUDIO_FORMAT_S16:
+ return AUDIO_S16LSB;
+
+ case AUDIO_FORMAT_U16:
+ return AUDIO_U16LSB;
+
+ case AUDIO_FORMAT_S32:
+ return AUDIO_S32LSB;
+
+ /* no unsigned 32-bit support in SDL */
+
+ case AUDIO_FORMAT_F32:
+ return AUDIO_F32LSB;
+
+ 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, AudioFormat *fmt, int *endianness)
+{
+ switch (sdlfmt) {
+ case AUDIO_S8:
+ *endianness = 0;
+ *fmt = AUDIO_FORMAT_S8;
+ break;
+
+ case AUDIO_U8:
+ *endianness = 0;
+ *fmt = AUDIO_FORMAT_U8;
+ break;
+
+ case AUDIO_S16LSB:
+ *endianness = 0;
+ *fmt = AUDIO_FORMAT_S16;
+ break;
+
+ case AUDIO_U16LSB:
+ *endianness = 0;
+ *fmt = AUDIO_FORMAT_U16;
+ break;
+
+ case AUDIO_S16MSB:
+ *endianness = 1;
+ *fmt = AUDIO_FORMAT_S16;
+ break;
+
+ case AUDIO_U16MSB:
+ *endianness = 1;
+ *fmt = AUDIO_FORMAT_U16;
+ break;
+
+ case AUDIO_S32LSB:
+ *endianness = 0;
+ *fmt = AUDIO_FORMAT_S32;
+ break;
+
+ case AUDIO_S32MSB:
+ *endianness = 1;
+ *fmt = AUDIO_FORMAT_S32;
+ break;
+
+ case AUDIO_F32LSB:
+ *endianness = 0;
+ *fmt = AUDIO_FORMAT_F32;
+ break;
+
+ case AUDIO_F32MSB:
+ *endianness = 1;
+ *fmt = AUDIO_FORMAT_F32;
+ break;
+
+ default:
+ dolog ("Unrecognized SDL audio format %d\n", sdlfmt);
+ return -1;
+ }
+
+ return 0;
+}
+
+static SDL_AudioDeviceID sdl_open(SDL_AudioSpec *req, SDL_AudioSpec *obt,
+ int rec)
+{
+ SDL_AudioDeviceID devid;
+#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 0;
+ }
+ err = pthread_sigmask (SIG_BLOCK, &new, &old);
+ if (err) {
+ dolog ("sdl_open: pthread_sigmask failed: %s\n", strerror (err));
+ return 0;
+ }
+#endif
+
+ devid = SDL_OpenAudioDevice(NULL, rec, req, obt, 0);
+ if (!devid) {
+ sdl_logerr("SDL_OpenAudioDevice for %s failed\n",
+ rec ? "recording" : "playback");
+ }
+
+#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 devid;
+}
+
+static void sdl_close_out(SDLVoiceOut *sdl)
+{
+ if (sdl->initialized) {
+ SDL_LockAudioDevice(sdl->devid);
+ sdl->exit = 1;
+ SDL_UnlockAudioDevice(sdl->devid);
+ SDL_PauseAudioDevice(sdl->devid, 1);
+ sdl->initialized = 0;
+ }
+ if (sdl->devid) {
+ SDL_CloseAudioDevice(sdl->devid);
+ sdl->devid = 0;
+ }
+}
+
+static void sdl_callback_out(void *opaque, Uint8 *buf, int len)
+{
+ SDLVoiceOut *sdl = opaque;
+ HWVoiceOut *hw = &sdl->hw;
+
+ if (!sdl->exit) {
+
+ /* dolog("callback_out: len=%d avail=%zu\n", len, hw->pending_emul); */
+
+ while (hw->pending_emul && len) {
+ size_t write_len;
+ ssize_t start = (ssize_t)hw->pos_emul - hw->pending_emul;
+ if (start < 0) {
+ start += hw->size_emul;
+ }
+ assert(start >= 0 && start < hw->size_emul);
+
+ write_len = MIN(MIN(hw->pending_emul, len),
+ hw->size_emul - start);
+
+ memcpy(buf, hw->buf_emul + start, write_len);
+ hw->pending_emul -= write_len;
+ len -= write_len;
+ buf += write_len;
+ }
+ }
+
+ /* clear remaining buffer that we couldn't fill with data */
+ if (len) {
+ audio_pcm_info_clear_buf(&hw->info, buf,
+ len / hw->info.bytes_per_frame);
+ }
+}
+
+static void sdl_close_in(SDLVoiceIn *sdl)
+{
+ if (sdl->initialized) {
+ SDL_LockAudioDevice(sdl->devid);
+ sdl->exit = 1;
+ SDL_UnlockAudioDevice(sdl->devid);
+ SDL_PauseAudioDevice(sdl->devid, 1);
+ sdl->initialized = 0;
+ }
+ if (sdl->devid) {
+ SDL_CloseAudioDevice(sdl->devid);
+ sdl->devid = 0;
+ }
+}
+
+static void sdl_callback_in(void *opaque, Uint8 *buf, int len)
+{
+ SDLVoiceIn *sdl = opaque;
+ HWVoiceIn *hw = &sdl->hw;
+
+ if (sdl->exit) {
+ return;
+ }
+
+ /* dolog("callback_in: len=%d pending=%zu\n", len, hw->pending_emul); */
+
+ while (hw->pending_emul < hw->size_emul && len) {
+ size_t read_len = MIN(len, MIN(hw->size_emul - hw->pos_emul,
+ hw->size_emul - hw->pending_emul));
+
+ memcpy(hw->buf_emul + hw->pos_emul, buf, read_len);
+
+ hw->pending_emul += read_len;
+ hw->pos_emul = (hw->pos_emul + read_len) % hw->size_emul;
+ len -= read_len;
+ buf += read_len;
+ }
+}
+
+#define SDL_WRAPPER_FUNC(name, ret_type, args_decl, args, dir) \
+ static ret_type glue(sdl_, name)args_decl \
+ { \
+ ret_type ret; \
+ glue(SDLVoice, dir) *sdl = (glue(SDLVoice, dir) *)hw; \
+ \
+ SDL_LockAudioDevice(sdl->devid); \
+ ret = glue(audio_generic_, name)args; \
+ SDL_UnlockAudioDevice(sdl->devid); \
+ \
+ return ret; \
+ }
+
+#define SDL_WRAPPER_VOID_FUNC(name, args_decl, args, dir) \
+ static void glue(sdl_, name)args_decl \
+ { \
+ glue(SDLVoice, dir) *sdl = (glue(SDLVoice, dir) *)hw; \
+ \
+ SDL_LockAudioDevice(sdl->devid); \
+ glue(audio_generic_, name)args; \
+ SDL_UnlockAudioDevice(sdl->devid); \
+ }
+
+SDL_WRAPPER_FUNC(get_buffer_out, void *, (HWVoiceOut *hw, size_t *size),
+ (hw, size), Out)
+SDL_WRAPPER_FUNC(put_buffer_out, size_t,
+ (HWVoiceOut *hw, void *buf, size_t size), (hw, buf, size), Out)
+SDL_WRAPPER_FUNC(write, size_t,
+ (HWVoiceOut *hw, void *buf, size_t size), (hw, buf, size), Out)
+SDL_WRAPPER_FUNC(read, size_t, (HWVoiceIn *hw, void *buf, size_t size),
+ (hw, buf, size), In)
+SDL_WRAPPER_FUNC(get_buffer_in, void *, (HWVoiceIn *hw, size_t *size),
+ (hw, size), In)
+SDL_WRAPPER_VOID_FUNC(put_buffer_in, (HWVoiceIn *hw, void *buf, size_t size),
+ (hw, buf, size), In)
+#undef SDL_WRAPPER_FUNC
+#undef SDL_WRAPPER_VOID_FUNC
+
+static void sdl_fini_out(HWVoiceOut *hw)
+{
+ SDLVoiceOut *sdl = (SDLVoiceOut *)hw;
+
+ sdl_close_out(sdl);
+}
+
+static int sdl_init_out(HWVoiceOut *hw, struct audsettings *as,
+ void *drv_opaque)
+{
+ SDLVoiceOut *sdl = (SDLVoiceOut *)hw;
+ SDL_AudioSpec req, obt;
+ int endianness;
+ int err;
+ AudioFormat effective_fmt;
+ Audiodev *dev = drv_opaque;
+ AudiodevSdlPerDirectionOptions *spdo = dev->u.sdl.out;
+ struct audsettings obt_as;
+
+ req.freq = as->freq;
+ req.format = aud_to_sdlfmt (as->fmt);
+ req.channels = as->nchannels;
+ /*
+ * This is wrong. SDL samples are QEMU frames. The buffer size will be
+ * the requested buffer size multiplied by the number of channels.
+ */
+ req.samples = audio_buffer_samples(
+ qapi_AudiodevSdlPerDirectionOptions_base(spdo), as, 11610);
+ req.callback = sdl_callback_out;
+ req.userdata = sdl;
+
+ sdl->dev = dev;
+ sdl->devid = sdl_open(&req, &obt, 0);
+ if (!sdl->devid) {
+ return -1;
+ }
+
+ err = sdl_to_audfmt(obt.format, &effective_fmt, &endianness);
+ if (err) {
+ sdl_close_out(sdl);
+ 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 = (spdo->has_buffer_count ? spdo->buffer_count : 4) *
+ obt.samples;
+
+ sdl->initialized = 1;
+ sdl->exit = 0;
+ return 0;
+}
+
+static void sdl_enable_out(HWVoiceOut *hw, bool enable)
+{
+ SDLVoiceOut *sdl = (SDLVoiceOut *)hw;
+
+ SDL_PauseAudioDevice(sdl->devid, !enable);
+}
+
+static void sdl_fini_in(HWVoiceIn *hw)
+{
+ SDLVoiceIn *sdl = (SDLVoiceIn *)hw;
+
+ sdl_close_in(sdl);
+}
+
+static int sdl_init_in(HWVoiceIn *hw, audsettings *as, void *drv_opaque)
+{
+ SDLVoiceIn *sdl = (SDLVoiceIn *)hw;
+ SDL_AudioSpec req, obt;
+ int endianness;
+ int err;
+ AudioFormat effective_fmt;
+ Audiodev *dev = drv_opaque;
+ AudiodevSdlPerDirectionOptions *spdo = dev->u.sdl.in;
+ struct audsettings obt_as;
+
+ req.freq = as->freq;
+ req.format = aud_to_sdlfmt(as->fmt);
+ req.channels = as->nchannels;
+ /* SDL samples are QEMU frames */
+ req.samples = audio_buffer_frames(
+ qapi_AudiodevSdlPerDirectionOptions_base(spdo), as, 11610);
+ req.callback = sdl_callback_in;
+ req.userdata = sdl;
+
+ sdl->dev = dev;
+ sdl->devid = sdl_open(&req, &obt, 1);
+ if (!sdl->devid) {
+ return -1;
+ }
+
+ err = sdl_to_audfmt(obt.format, &effective_fmt, &endianness);
+ if (err) {
+ sdl_close_in(sdl);
+ 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 = (spdo->has_buffer_count ? spdo->buffer_count : 4) *
+ obt.samples;
+ hw->size_emul = hw->samples * hw->info.bytes_per_frame;
+ hw->buf_emul = g_malloc(hw->size_emul);
+ hw->pos_emul = hw->pending_emul = 0;
+
+ sdl->initialized = 1;
+ sdl->exit = 0;
+ return 0;
+}
+
+static void sdl_enable_in(HWVoiceIn *hw, bool enable)
+{
+ SDLVoiceIn *sdl = (SDLVoiceIn *)hw;
+
+ SDL_PauseAudioDevice(sdl->devid, !enable);
+}
+
+static void *sdl_audio_init(Audiodev *dev)
+{
+ if (SDL_InitSubSystem (SDL_INIT_AUDIO)) {
+ sdl_logerr ("SDL failed to initialize audio subsystem\n");
+ return NULL;
+ }
+
+ return dev;
+}
+
+static void sdl_audio_fini (void *opaque)
+{
+ SDL_QuitSubSystem (SDL_INIT_AUDIO);
+}
+
+static struct audio_pcm_ops sdl_pcm_ops = {
+ .init_out = sdl_init_out,
+ .fini_out = sdl_fini_out,
+ /* wrapper for audio_generic_write */
+ .write = sdl_write,
+ /* wrapper for audio_generic_get_buffer_out */
+ .get_buffer_out = sdl_get_buffer_out,
+ /* wrapper for audio_generic_put_buffer_out */
+ .put_buffer_out = sdl_put_buffer_out,
+ .enable_out = sdl_enable_out,
+ .init_in = sdl_init_in,
+ .fini_in = sdl_fini_in,
+ /* wrapper for audio_generic_read */
+ .read = sdl_read,
+ /* wrapper for audio_generic_get_buffer_in */
+ .get_buffer_in = sdl_get_buffer_in,
+ /* wrapper for audio_generic_put_buffer_in */
+ .put_buffer_in = sdl_put_buffer_in,
+ .enable_in = sdl_enable_in,
+};
+
+static struct audio_driver sdl_audio_driver = {
+ .name = "sdl",
+ .descr = "SDL http://www.libsdl.org",
+ .init = sdl_audio_init,
+ .fini = sdl_audio_fini,
+ .pcm_ops = &sdl_pcm_ops,
+ .can_be_default = 1,
+ .max_voices_out = INT_MAX,
+ .max_voices_in = INT_MAX,
+ .voice_size_out = sizeof(SDLVoiceOut),
+ .voice_size_in = sizeof(SDLVoiceIn),
+};
+
+static void register_audio_sdl(void)
+{
+ audio_driver_register(&sdl_audio_driver);
+}
+type_init(register_audio_sdl);