root / audio / sdlaudio.c @ e784ba70
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/*
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* QEMU SDL audio driver
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*
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* Copyright (c) 2004-2005 Vassili Karpov (malc)
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <SDL.h> |
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#include <SDL_thread.h> |
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#include "vl.h" |
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#ifndef _WIN32
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#ifdef __sun__
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#define _POSIX_PTHREAD_SEMANTICS 1 |
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#endif
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#include <signal.h> |
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#endif
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#define AUDIO_CAP "sdl" |
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#include "audio_int.h" |
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typedef struct SDLVoiceOut { |
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HWVoiceOut hw; |
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int live;
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int rpos;
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int decr;
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} SDLVoiceOut; |
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static struct { |
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int nb_samples;
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} conf = { |
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1024
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}; |
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struct SDLAudioState {
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int exit;
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SDL_mutex *mutex; |
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SDL_sem *sem; |
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int initialized;
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} glob_sdl; |
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typedef struct SDLAudioState SDLAudioState; |
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static void GCC_FMT_ATTR (1, 2) sdl_logerr (const char *fmt, ...) |
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{ |
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va_list ap; |
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va_start (ap, fmt); |
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AUD_vlog (AUDIO_CAP, fmt, ap); |
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va_end (ap); |
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AUD_log (AUDIO_CAP, "Reason: %s\n", SDL_GetError ());
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} |
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static int sdl_lock (SDLAudioState *s, const char *forfn) |
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{ |
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if (SDL_LockMutex (s->mutex)) {
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sdl_logerr ("SDL_LockMutex for %s failed\n", forfn);
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return -1; |
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} |
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return 0; |
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} |
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static int sdl_unlock (SDLAudioState *s, const char *forfn) |
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{ |
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if (SDL_UnlockMutex (s->mutex)) {
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sdl_logerr ("SDL_UnlockMutex for %s failed\n", forfn);
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return -1; |
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} |
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return 0; |
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} |
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static int sdl_post (SDLAudioState *s, const char *forfn) |
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{ |
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if (SDL_SemPost (s->sem)) {
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sdl_logerr ("SDL_SemPost for %s failed\n", forfn);
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return -1; |
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} |
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return 0; |
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} |
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static int sdl_wait (SDLAudioState *s, const char *forfn) |
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{ |
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if (SDL_SemWait (s->sem)) {
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sdl_logerr ("SDL_SemWait for %s failed\n", forfn);
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return -1; |
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} |
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return 0; |
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} |
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static int sdl_unlock_and_post (SDLAudioState *s, const char *forfn) |
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{ |
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if (sdl_unlock (s, forfn)) {
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return -1; |
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} |
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return sdl_post (s, forfn);
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} |
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static int aud_to_sdlfmt (audfmt_e fmt, int *shift) |
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{ |
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switch (fmt) {
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case AUD_FMT_S8:
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*shift = 0;
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return AUDIO_S8;
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case AUD_FMT_U8:
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*shift = 0;
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return AUDIO_U8;
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case AUD_FMT_S16:
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*shift = 1;
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return AUDIO_S16LSB;
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case AUD_FMT_U16:
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*shift = 1;
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return AUDIO_U16LSB;
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default:
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dolog ("Internal logic error: Bad audio format %d\n", fmt);
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#ifdef DEBUG_AUDIO
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abort (); |
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#endif
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return AUDIO_U8;
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} |
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} |
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static int sdl_to_audfmt (int sdlfmt, audfmt_e *fmt, int *endianess) |
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{ |
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switch (sdlfmt) {
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case AUDIO_S8:
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*endianess = 0;
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*fmt = AUD_FMT_S8; |
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break;
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case AUDIO_U8:
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*endianess = 0;
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*fmt = AUD_FMT_U8; |
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break;
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case AUDIO_S16LSB:
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*endianess = 0;
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*fmt = AUD_FMT_S16; |
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break;
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case AUDIO_U16LSB:
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*endianess = 0;
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*fmt = AUD_FMT_U16; |
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break;
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case AUDIO_S16MSB:
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*endianess = 1;
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*fmt = AUD_FMT_S16; |
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break;
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case AUDIO_U16MSB:
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*endianess = 1;
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*fmt = AUD_FMT_U16; |
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break;
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default:
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dolog ("Unrecognized SDL audio format %d\n", sdlfmt);
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return -1; |
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} |
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return 0; |
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} |
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static int sdl_open (SDL_AudioSpec *req, SDL_AudioSpec *obt) |
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{ |
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int status;
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#ifndef _WIN32
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sigset_t new, old; |
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/* Make sure potential threads created by SDL don't hog signals. */
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sigfillset (&new); |
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pthread_sigmask (SIG_BLOCK, &new, &old); |
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#endif
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status = SDL_OpenAudio (req, obt); |
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if (status) {
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sdl_logerr ("SDL_OpenAudio failed\n");
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} |
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#ifndef _WIN32
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pthread_sigmask (SIG_SETMASK, &old, 0);
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#endif
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return status;
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} |
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static void sdl_close (SDLAudioState *s) |
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{ |
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if (s->initialized) {
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sdl_lock (s, "sdl_close");
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s->exit = 1;
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sdl_unlock_and_post (s, "sdl_close");
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SDL_PauseAudio (1);
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SDL_CloseAudio (); |
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s->initialized = 0;
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} |
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} |
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static void sdl_callback (void *opaque, Uint8 *buf, int len) |
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{ |
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SDLVoiceOut *sdl = opaque; |
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SDLAudioState *s = &glob_sdl; |
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HWVoiceOut *hw = &sdl->hw; |
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int samples = len >> hw->info.shift;
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if (s->exit) {
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return;
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} |
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while (samples) {
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int to_mix, decr;
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/* dolog ("in callback samples=%d\n", samples); */
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sdl_wait (s, "sdl_callback");
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if (s->exit) {
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return;
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} |
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if (sdl_lock (s, "sdl_callback")) { |
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return;
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} |
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if (audio_bug (AUDIO_FUNC, sdl->live < 0 || sdl->live > hw->samples)) { |
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dolog ("sdl->live=%d hw->samples=%d\n",
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sdl->live, hw->samples); |
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return;
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} |
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if (!sdl->live) {
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goto again;
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} |
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/* dolog ("in callback live=%d\n", live); */
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to_mix = audio_MIN (samples, sdl->live); |
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decr = to_mix; |
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while (to_mix) {
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int chunk = audio_MIN (to_mix, hw->samples - hw->rpos);
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st_sample_t *src = hw->mix_buf + hw->rpos; |
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/* dolog ("in callback to_mix %d, chunk %d\n", to_mix, chunk); */
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hw->clip (buf, src, chunk); |
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sdl->rpos = (sdl->rpos + chunk) % hw->samples; |
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to_mix -= chunk; |
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buf += chunk << hw->info.shift; |
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} |
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samples -= decr; |
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sdl->live -= decr; |
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sdl->decr += decr; |
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again:
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if (sdl_unlock (s, "sdl_callback")) { |
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return;
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} |
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} |
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/* dolog ("done len=%d\n", len); */
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} |
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static int sdl_write_out (SWVoiceOut *sw, void *buf, int len) |
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{ |
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return audio_pcm_sw_write (sw, buf, len);
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} |
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static int sdl_run_out (HWVoiceOut *hw) |
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{ |
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int decr, live;
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SDLVoiceOut *sdl = (SDLVoiceOut *) hw; |
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SDLAudioState *s = &glob_sdl; |
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if (sdl_lock (s, "sdl_callback")) { |
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return 0; |
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} |
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live = audio_pcm_hw_get_live_out (hw); |
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if (sdl->decr > live) {
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ldebug ("sdl->decr %d live %d sdl->live %d\n",
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sdl->decr, |
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live, |
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sdl->live); |
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} |
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decr = audio_MIN (sdl->decr, live); |
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sdl->decr -= decr; |
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sdl->live = live - decr; |
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hw->rpos = sdl->rpos; |
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if (sdl->live > 0) { |
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sdl_unlock_and_post (s, "sdl_callback");
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} |
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else {
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sdl_unlock (s, "sdl_callback");
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} |
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return decr;
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} |
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static void sdl_fini_out (HWVoiceOut *hw) |
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{ |
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(void) hw;
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sdl_close (&glob_sdl); |
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} |
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static int sdl_init_out (HWVoiceOut *hw, audsettings_t *as) |
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{ |
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SDLVoiceOut *sdl = (SDLVoiceOut *) hw; |
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SDLAudioState *s = &glob_sdl; |
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SDL_AudioSpec req, obt; |
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int shift;
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int endianess;
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int err;
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audfmt_e effective_fmt; |
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audsettings_t obt_as; |
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shift <<= as->nchannels == 2;
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req.freq = as->freq; |
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req.format = aud_to_sdlfmt (as->fmt, &shift); |
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req.channels = as->nchannels; |
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req.samples = conf.nb_samples; |
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req.callback = sdl_callback; |
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req.userdata = sdl; |
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if (sdl_open (&req, &obt)) {
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return -1; |
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} |
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err = sdl_to_audfmt (obt.format, &effective_fmt, &endianess); |
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if (err) {
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sdl_close (s); |
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return -1; |
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} |
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obt_as.freq = obt.freq; |
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obt_as.nchannels = obt.channels; |
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obt_as.fmt = effective_fmt; |
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obt_as.endianness = endianess; |
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audio_pcm_init_info (&hw->info, &obt_as); |
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hw->samples = obt.samples; |
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s->initialized = 1;
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s->exit = 0;
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SDL_PauseAudio (0);
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return 0; |
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} |
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static int sdl_ctl_out (HWVoiceOut *hw, int cmd, ...) |
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{ |
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(void) hw;
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switch (cmd) {
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case VOICE_ENABLE:
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SDL_PauseAudio (0);
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break;
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case VOICE_DISABLE:
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SDL_PauseAudio (1);
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break;
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} |
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return 0; |
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} |
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static void *sdl_audio_init (void) |
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{ |
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SDLAudioState *s = &glob_sdl; |
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if (SDL_InitSubSystem (SDL_INIT_AUDIO)) {
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sdl_logerr ("SDL failed to initialize audio subsystem\n");
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return NULL; |
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} |
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s->mutex = SDL_CreateMutex (); |
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if (!s->mutex) {
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sdl_logerr ("Failed to create SDL mutex\n");
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SDL_QuitSubSystem (SDL_INIT_AUDIO); |
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return NULL; |
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} |
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s->sem = SDL_CreateSemaphore (0);
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if (!s->sem) {
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sdl_logerr ("Failed to create SDL semaphore\n");
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SDL_DestroyMutex (s->mutex); |
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SDL_QuitSubSystem (SDL_INIT_AUDIO); |
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return NULL; |
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} |
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return s;
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} |
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static void sdl_audio_fini (void *opaque) |
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{ |
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SDLAudioState *s = opaque; |
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sdl_close (s); |
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SDL_DestroySemaphore (s->sem); |
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SDL_DestroyMutex (s->mutex); |
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SDL_QuitSubSystem (SDL_INIT_AUDIO); |
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} |
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static struct audio_option sdl_options[] = { |
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{"SAMPLES", AUD_OPT_INT, &conf.nb_samples,
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"Size of SDL buffer in samples", NULL, 0}, |
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{NULL, 0, NULL, NULL, NULL, 0} |
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}; |
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static struct audio_pcm_ops sdl_pcm_ops = { |
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sdl_init_out, |
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sdl_fini_out, |
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sdl_run_out, |
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sdl_write_out, |
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sdl_ctl_out, |
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NULL,
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NULL,
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NULL,
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NULL,
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NULL
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}; |
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struct audio_driver sdl_audio_driver = {
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INIT_FIELD (name = ) "sdl",
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INIT_FIELD (descr = ) "SDL http://www.libsdl.org",
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INIT_FIELD (options = ) sdl_options, |
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INIT_FIELD (init = ) sdl_audio_init, |
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INIT_FIELD (fini = ) sdl_audio_fini, |
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INIT_FIELD (pcm_ops = ) &sdl_pcm_ops, |
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INIT_FIELD (can_be_default = ) 1,
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INIT_FIELD (max_voices_out = ) 1,
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INIT_FIELD (max_voices_in = ) 0,
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INIT_FIELD (voice_size_out = ) sizeof (SDLVoiceOut),
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INIT_FIELD (voice_size_in = ) 0
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}; |