324 lines
7.6 KiB
C
324 lines
7.6 KiB
C
/*
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* QEMU SDL audio output driver
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*
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* Copyright (c) 2004 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/SDL.h>
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#include <SDL/SDL_thread.h>
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#include "vl.h"
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#define AUDIO_CAP "sdl"
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#include "audio/audio.h"
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#include "audio/sdlaudio.h"
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#define QC_SDL_SAMPLES "QEMU_SDL_SAMPLES"
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#define errstr() SDL_GetError ()
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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 sdl_hw_run (HWVoice *hw)
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{
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(void) hw;
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}
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static int sdl_lock (SDLAudioState *s)
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{
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if (SDL_LockMutex (s->mutex)) {
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dolog ("SDL_LockMutex failed\nReason: %s\n", errstr ());
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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)
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{
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if (SDL_UnlockMutex (s->mutex)) {
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dolog ("SDL_UnlockMutex failed\nReason: %s\n", errstr ());
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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)
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{
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if (SDL_SemPost (s->sem)) {
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dolog ("SDL_SemPost failed\nReason: %s\n", errstr ());
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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)
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{
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if (SDL_SemWait (s->sem)) {
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dolog ("SDL_SemWait failed\nReason: %s\n", errstr ());
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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)
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{
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if (sdl_unlock (s))
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return -1;
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return sdl_post (s);
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}
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static int sdl_hw_write (SWVoice *sw, void *buf, int len)
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{
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int ret;
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SDLAudioState *s = &glob_sdl;
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sdl_lock (s);
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ret = pcm_hw_write (sw, buf, len);
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sdl_unlock_and_post (s);
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return ret;
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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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*shift = 0;
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switch (fmt) {
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case AUD_FMT_S8: return AUDIO_S8;
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case AUD_FMT_U8: return AUDIO_U8;
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case AUD_FMT_S16: *shift = 1; return AUDIO_S16LSB;
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case AUD_FMT_U16: *shift = 1; return AUDIO_U16LSB;
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default:
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dolog ("Internal logic error: Bad audio format %d\nAborting\n", fmt);
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exit (EXIT_FAILURE);
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}
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}
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static int sdl_to_audfmt (int fmt)
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{
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switch (fmt) {
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case AUDIO_S8: return AUD_FMT_S8;
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case AUDIO_U8: return AUD_FMT_U8;
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case AUDIO_S16LSB: return AUD_FMT_S16;
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case AUDIO_U16LSB: return AUD_FMT_U16;
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default:
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dolog ("Internal logic error: Unrecognized SDL audio format %d\n"
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"Aborting\n", fmt);
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exit (EXIT_FAILURE);
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}
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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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status = SDL_OpenAudio (req, obt);
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if (status) {
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dolog ("SDL_OpenAudio failed\nReason: %s\n", errstr ());
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}
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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);
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s->exit = 1;
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sdl_unlock_and_post (s);
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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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SDLVoice *sdl = opaque;
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SDLAudioState *s = &glob_sdl;
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HWVoice *hw = &sdl->hw;
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int samples = len >> hw->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, live, decr;
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/* dolog ("in callback samples=%d\n", samples); */
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sdl_wait (s);
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if (s->exit) {
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return;
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}
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sdl_lock (s);
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live = pcm_hw_get_live (hw);
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if (live <= 0)
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goto again;
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/* dolog ("in callback live=%d\n", live); */
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to_mix = audio_MIN (samples, 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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memset (src, 0, chunk * sizeof (st_sample_t));
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hw->rpos = (hw->rpos + chunk) % hw->samples;
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to_mix -= chunk;
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buf += chunk << hw->shift;
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}
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samples -= decr;
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pcm_hw_dec_live (hw, decr);
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again:
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sdl_unlock (s);
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}
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/* dolog ("done len=%d\n", len); */
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}
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static void sdl_hw_fini (HWVoice *hw)
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{
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ldebug ("sdl_hw_fini %d fixed=%d\n",
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glob_sdl.initialized, audio_conf.fixed_format);
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sdl_close (&glob_sdl);
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}
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static int sdl_hw_init (HWVoice *hw, int freq, int nchannels, audfmt_e fmt)
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{
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SDLVoice *sdl = (SDLVoice *) 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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ldebug ("sdl_hw_init %d freq=%d fixed=%d\n",
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s->initialized, freq, audio_conf.fixed_format);
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if (nchannels != 2) {
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dolog ("Bogus channel count %d\n", nchannels);
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return -1;
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}
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req.freq = freq;
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req.format = AUD_to_sdlfmt (fmt, &shift);
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req.channels = nchannels;
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req.samples = conf.nb_samples;
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shift <<= nchannels == 2;
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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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hw->freq = obt.freq;
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hw->fmt = sdl_to_audfmt (obt.format);
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hw->nchannels = obt.channels;
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hw->bufsize = obt.samples << shift;
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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_hw_ctl (HWVoice *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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conf.nb_samples = audio_get_conf_int (QC_SDL_SAMPLES, conf.nb_samples);
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if (SDL_InitSubSystem (SDL_INIT_AUDIO)) {
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dolog ("SDL failed to initialize audio subsystem\nReason: %s\n",
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errstr ());
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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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dolog ("Failed to create SDL mutex\nReason: %s\n", errstr ());
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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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dolog ("Failed to create SDL semaphore\nReason: %s\n", errstr ());
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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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struct pcm_ops sdl_pcm_ops = {
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sdl_hw_init,
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sdl_hw_fini,
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sdl_hw_run,
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sdl_hw_write,
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sdl_hw_ctl
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};
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struct audio_output_driver sdl_output_driver = {
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"sdl",
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sdl_audio_init,
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sdl_audio_fini,
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&sdl_pcm_ops,
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1,
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1,
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sizeof (SDLVoice)
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};
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