From ce31f099fba5ac72834fc96ae6edc41713275989 Mon Sep 17 00:00:00 2001 From: Volker Rümelin Date: Sun, 10 Jan 2021 11:02:23 +0100 Subject: sdlaudio: replace legacy functions with modern ones With the modern audio functions it's possible to add new features like audio recording. As a side effect this patch fixes a bug where SDL2 can't be used on Windows. This bug was reported on the qemu-devel mailing list at https://lists.nongnu.org/archive/html/qemu-devel/2020-01/msg04043.html Signed-off-by: Volker Rümelin Reviewed-by: Thomas Huth Message-id: 9315afe5-5958-c0b4-ea1e-14769511a9d5@t-online.de Message-Id: <20210110100239.27588-7-vr_qemu@t-online.de> Signed-off-by: Gerd Hoffmann --- audio/sdlaudio.c | 107 ++++++++++++++++++++++++++----------------------------- 1 file changed, 50 insertions(+), 57 deletions(-) diff --git a/audio/sdlaudio.c b/audio/sdlaudio.c index 01ae4c600e..47968c5020 100644 --- a/audio/sdlaudio.c +++ b/audio/sdlaudio.c @@ -41,15 +41,11 @@ typedef struct SDLVoiceOut { HWVoiceOut hw; -} SDLVoiceOut; - -static struct SDLAudioState { int exit; int initialized; - bool driver_created; Audiodev *dev; -} glob_sdl; -typedef struct SDLAudioState SDLAudioState; + SDL_AudioDeviceID devid; +} SDLVoiceOut; static void GCC_FMT_ATTR (1, 2) sdl_logerr (const char *fmt, ...) { @@ -155,9 +151,10 @@ static int sdl_to_audfmt(int sdlfmt, AudioFormat *fmt, int *endianness) return 0; } -static int sdl_open (SDL_AudioSpec *req, SDL_AudioSpec *obt) +static SDL_AudioDeviceID sdl_open(SDL_AudioSpec *req, SDL_AudioSpec *obt, + int rec) { - int status; + SDL_AudioDeviceID devid; #ifndef _WIN32 int err; sigset_t new, old; @@ -166,18 +163,19 @@ static int sdl_open (SDL_AudioSpec *req, SDL_AudioSpec *obt) err = sigfillset (&new); if (err) { dolog ("sdl_open: sigfillset failed: %s\n", strerror (errno)); - return -1; + return 0; } err = pthread_sigmask (SIG_BLOCK, &new, &old); if (err) { dolog ("sdl_open: pthread_sigmask failed: %s\n", strerror (err)); - return -1; + return 0; } #endif - status = SDL_OpenAudio (req, obt); - if (status) { - sdl_logerr ("SDL_OpenAudio failed\n"); + devid = SDL_OpenAudioDevice(NULL, rec, req, obt, 0); + if (!devid) { + sdl_logerr("SDL_OpenAudioDevice for %s failed\n", + rec ? "recording" : "playback"); } #ifndef _WIN32 @@ -190,30 +188,32 @@ static int sdl_open (SDL_AudioSpec *req, SDL_AudioSpec *obt) exit (EXIT_FAILURE); } #endif - return status; + return devid; } -static void sdl_close (SDLAudioState *s) +static void sdl_close_out(SDLVoiceOut *sdl) { - if (s->initialized) { - SDL_LockAudio(); - s->exit = 1; - SDL_UnlockAudio(); - SDL_PauseAudio (1); - SDL_CloseAudio (); - s->initialized = 0; + 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 (void *opaque, Uint8 *buf, int len) +static void sdl_callback_out(void *opaque, Uint8 *buf, int len) { SDLVoiceOut *sdl = opaque; - SDLAudioState *s = &glob_sdl; HWVoiceOut *hw = &sdl->hw; - if (!s->exit) { + if (!sdl->exit) { - /* dolog("callback: len=%d avail=%zu\n", len, hw->pending_emul); */ + /* dolog("callback_out: len=%d avail=%zu\n", len, hw->pending_emul); */ while (hw->pending_emul && len) { size_t write_len; @@ -240,43 +240,44 @@ static void sdl_callback (void *opaque, Uint8 *buf, int len) } } -#define SDL_WRAPPER_FUNC(name, ret_type, args_decl, args) \ +#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_LockAudio(); \ + SDL_LockAudioDevice(sdl->devid); \ ret = glue(audio_generic_, name)args; \ - SDL_UnlockAudio(); \ + SDL_UnlockAudioDevice(sdl->devid); \ \ return ret; \ } SDL_WRAPPER_FUNC(get_buffer_out, void *, (HWVoiceOut *hw, size_t *size), - (hw, size)) + (hw, size), Out) SDL_WRAPPER_FUNC(put_buffer_out, size_t, - (HWVoiceOut *hw, void *buf, size_t size), (hw, buf, size)) + (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)) + (HWVoiceOut *hw, void *buf, size_t size), (hw, buf, size), Out) #undef SDL_WRAPPER_FUNC -static void sdl_fini_out (HWVoiceOut *hw) +static void sdl_fini_out(HWVoiceOut *hw) { - (void) hw; + SDLVoiceOut *sdl = (SDLVoiceOut *)hw; - sdl_close (&glob_sdl); + sdl_close_out(sdl); } static int sdl_init_out(HWVoiceOut *hw, struct audsettings *as, void *drv_opaque) { - SDLVoiceOut *sdl = (SDLVoiceOut *) hw; - SDLAudioState *s = &glob_sdl; + SDLVoiceOut *sdl = (SDLVoiceOut *)hw; SDL_AudioSpec req, obt; int endianness; int err; AudioFormat effective_fmt; - AudiodevSdlPerDirectionOptions *spdo = s->dev->u.sdl.out; + Audiodev *dev = drv_opaque; + AudiodevSdlPerDirectionOptions *spdo = dev->u.sdl.out; struct audsettings obt_as; req.freq = as->freq; @@ -288,16 +289,18 @@ static int sdl_init_out(HWVoiceOut *hw, struct audsettings *as, */ req.samples = audio_buffer_samples( qapi_AudiodevSdlPerDirectionOptions_base(spdo), as, 11610); - req.callback = sdl_callback; + req.callback = sdl_callback_out; req.userdata = sdl; - if (sdl_open (&req, &obt)) { + 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 (s); + sdl_close_out(sdl); return -1; } @@ -310,41 +313,31 @@ static int sdl_init_out(HWVoiceOut *hw, struct audsettings *as, hw->samples = (spdo->has_buffer_count ? spdo->buffer_count : 4) * obt.samples; - s->initialized = 1; - s->exit = 0; + sdl->initialized = 1; + sdl->exit = 0; return 0; } static void sdl_enable_out(HWVoiceOut *hw, bool enable) { - SDL_PauseAudio(!enable); + SDLVoiceOut *sdl = (SDLVoiceOut *)hw; + + SDL_PauseAudioDevice(sdl->devid, !enable); } static void *sdl_audio_init(Audiodev *dev) { - 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->driver_created = true; - s->dev = dev; - return s; + return dev; } static void sdl_audio_fini (void *opaque) { - SDLAudioState *s = opaque; - sdl_close (s); SDL_QuitSubSystem (SDL_INIT_AUDIO); - s->driver_created = false; - s->dev = NULL; } static struct audio_pcm_ops sdl_pcm_ops = { -- cgit v1.2.3-55-g7522