diff options
Diffstat (limited to 'audio/sdlaudio.c')
-rw-r--r-- | audio/sdlaudio.c | 433 |
1 files changed, 433 insertions, 0 deletions
diff --git a/audio/sdlaudio.c b/audio/sdlaudio.c new file mode 100644 index 0000000..f2a6896 --- /dev/null +++ b/audio/sdlaudio.c @@ -0,0 +1,433 @@ +/* + * 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 "vl.h" + +#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 = { + 1024 +}; + +struct SDLAudioState { + int exit; + SDL_mutex *mutex; + SDL_sem *sem; + int initialized; +} 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, int *shift) +{ + switch (fmt) { + case AUD_FMT_S8: + *shift = 0; + return AUDIO_S8; + + case AUD_FMT_U8: + *shift = 0; + 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\n", fmt); +#ifdef DEBUG_AUDIO + abort (); +#endif + return AUDIO_U8; + } +} + +static int sdl_to_audfmt (int sdlfmt, audfmt_e *fmt, int *endianess) +{ + switch (sdlfmt) { + case AUDIO_S8: + *endianess = 0; + *fmt = AUD_FMT_S8; + break; + + case AUDIO_U8: + *endianess = 0; + *fmt = AUD_FMT_U8; + break; + + case AUDIO_S16LSB: + *endianess = 0; + *fmt = AUD_FMT_S16; + break; + + case AUDIO_U16LSB: + *endianess = 0; + *fmt = AUD_FMT_U16; + break; + + case AUDIO_S16MSB: + *endianess = 1; + *fmt = AUD_FMT_S16; + break; + + case AUDIO_U16MSB: + *endianess = 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; + + status = SDL_OpenAudio (req, obt); + if (status) { + sdl_logerr ("SDL_OpenAudio failed\n"); + } + 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); + 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); + 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 decr, live; + SDLVoiceOut *sdl = (SDLVoiceOut *) hw; + SDLAudioState *s = &glob_sdl; + + if (sdl_lock (s, "sdl_callback")) { + return 0; + } + + live = audio_pcm_hw_get_live_out (hw); + + 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_callback"); + } + else { + sdl_unlock (s, "sdl_callback"); + } + return decr; +} + +static void sdl_fini_out (HWVoiceOut *hw) +{ + (void) hw; + + sdl_close (&glob_sdl); +} + +static int sdl_init_out (HWVoiceOut *hw, audsettings_t *as) +{ + SDLVoiceOut *sdl = (SDLVoiceOut *) hw; + SDLAudioState *s = &glob_sdl; + SDL_AudioSpec req, obt; + int shift; + int endianess; + int err; + audfmt_e effective_fmt; + audsettings_t obt_as; + + shift <<= as->nchannels == 2; + + req.freq = as->freq; + req.format = aud_to_sdlfmt (as->fmt, &shift); + 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, &endianess); + 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 = endianess; + + 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 (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; + } + + 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); +} + +static struct audio_option sdl_options[] = { + {"SAMPLES", AUD_OPT_INT, &conf.nb_samples, + "Size of SDL buffer in samples", NULL, 0}, + {NULL, 0, NULL, NULL, NULL, 0} +}; + +static struct audio_pcm_ops sdl_pcm_ops = { + sdl_init_out, + sdl_fini_out, + sdl_run_out, + sdl_write_out, + sdl_ctl_out, + + NULL, + NULL, + NULL, + NULL, + NULL +}; + +struct audio_driver sdl_audio_driver = { + INIT_FIELD (name = ) "sdl", + INIT_FIELD (descr = ) "SDL http://www.libsdl.org", + INIT_FIELD (options = ) sdl_options, + INIT_FIELD (init = ) sdl_audio_init, + INIT_FIELD (fini = ) sdl_audio_fini, + INIT_FIELD (pcm_ops = ) &sdl_pcm_ops, + INIT_FIELD (can_be_default = ) 1, + INIT_FIELD (max_voices_out = ) 1, + INIT_FIELD (max_voices_in = ) 0, + INIT_FIELD (voice_size_out = ) sizeof (SDLVoiceOut), + INIT_FIELD (voice_size_in = ) 0 +}; |