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sdlaudio: port to the new audio backend api

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Signed-off-by: Kővágó, Zoltán <DirtY.iCE.hu@gmail.com>
Message-id: ac1722a03fb1b530c2081f46585ce7fa80ebef6c.1568927990.git.DirtY.iCE.hu@gmail.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Kővágó, Zoltán 2019-09-19 23:24:16 +02:00 committed by Gerd Hoffmann
parent 49ddd7e122
commit ff71876766
1 changed files with 41 additions and 44 deletions
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85
audio/sdlaudio.c
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@ -41,8 +41,6 @@
typedef struct SDLVoiceOut {
HWVoiceOut hw;
size_t live;
size_t decr;
} SDLVoiceOut;
static struct SDLAudioState {
@ -184,62 +182,59 @@ static void sdl_callback (void *opaque, Uint8 *buf, int len)
SDLVoiceOut *sdl = opaque;
SDLAudioState *s = &glob_sdl;
HWVoiceOut *hw = &sdl->hw;
size_t samples = len >> hw->info.shift;
size_t to_mix, decr;
if (s->exit || !sdl->live) {
if (s->exit) {
return;
}
/* dolog ("in callback samples=%zu live=%zu\n", samples, sdl->live); */
to_mix = MIN(samples, sdl->live);
decr = to_mix;
while (to_mix) {
size_t chunk = MIN(to_mix, hw->samples - hw->rpos);
struct st_sample *src = hw->mix_buf + hw->rpos;
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);
/* dolog ("in callback to_mix %zu, chunk %zu\n", to_mix, chunk); */
hw->clip(buf, src, chunk);
hw->rpos = (hw->rpos + chunk) % hw->samples;
to_mix -= chunk;
buf += chunk << hw->info.shift;
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;
}
samples -= decr;
sdl->live -= decr;
sdl->decr += decr;
/* dolog ("done len=%zu\n", len); */
/* SDL2 does not clear the remaining buffer for us, so do it on our own */
if (samples) {
memset(buf, 0, samples << hw->info.shift);
/* clear remaining buffer that we couldn't fill with data */
if (len) {
memset(buf, 0, len);
}
}
static size_t sdl_run_out(HWVoiceOut *hw, size_t live)
{
size_t decr;
SDLVoiceOut *sdl = (SDLVoiceOut *) hw;
SDL_LockAudio();
if (sdl->decr > live) {
ldebug ("sdl->decr %d live %d sdl->live %d\n",
sdl->decr,
live,
sdl->live);
#define SDL_WRAPPER_FUNC(name, ret_type, args_decl, args, fail, unlock) \
static ret_type glue(sdl_, name)args_decl \
{ \
ret_type ret; \
\
SDL_LockAudio(); \
\
ret = glue(audio_generic_, name)args; \
\
SDL_UnlockAudio(); \
return ret; \
}
decr = MIN (sdl->decr, live);
sdl->decr -= decr;
SDL_WRAPPER_FUNC(get_buffer_out, void *, (HWVoiceOut *hw, size_t *size),
(hw, size), *size = 0, sdl_unlock)
SDL_WRAPPER_FUNC(put_buffer_out_nowrite, size_t,
(HWVoiceOut *hw, void *buf, size_t size), (hw, buf, size),
/*nothing*/, sdl_unlock_and_post)
SDL_WRAPPER_FUNC(write, size_t,
(HWVoiceOut *hw, void *buf, size_t size), (hw, buf, size),
/*nothing*/, sdl_unlock_and_post)
sdl->live = live;
SDL_UnlockAudio();
return decr;
}
#undef SDL_WRAPPER_FUNC
static void sdl_fini_out (HWVoiceOut *hw)
{
@ -336,7 +331,9 @@ static void sdl_audio_fini (void *opaque)
static struct audio_pcm_ops sdl_pcm_ops = {
.init_out = sdl_init_out,
.fini_out = sdl_fini_out,
.run_out = sdl_run_out,
.write = sdl_write,
.get_buffer_out = sdl_get_buffer_out,
.put_buffer_out = sdl_put_buffer_out_nowrite,
.ctl_out = sdl_ctl_out,
};