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qemu/audio/sdlaudio.c
Volker Rümelin bd37ede4eb sdlaudio: enable (in|out).mixing-engine=off 
Enable the SDL2 backend options -audiodev sdl,out.mixing-
engine=off,in.mixing-engine=off.

Signed-off-by: Volker Rümelin <vr_qemu@t-online.de>
Message-id: 9315afe5-5958-c0b4-ea1e-14769511a9d5@t-online.de
Message-Id: <20210110100239.27588-11-vr_qemu@t-online.de>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
2021-01-15 11:25:22 +01:00

508 lines
14 KiB
C
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/*
* 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);
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