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audio: Clean up some CloseDevice() interface details.

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- It's now always called if device->hidden isn't NULL, even if OpenDevice()
  failed halfway through. This lets implementation code not have to clean up
  itself on every possible failure point; just return an error and SDL will
  handle it for you.

- Implementations can assume this->hidden != NULL and not check for it.

- implementations don't have to set this->hidden = NULL when done, because
  the caller is always about to free(this).

- Don't reset other fields that are in a block of memory about to be free()'d.

- Implementations all now free things like internal mix buffers last, after
  closing devices and such, to guarantee they definitely aren't in use anymore
  at the point of deallocation.
This commit is contained in:
Ryan C. Gordon
2016-08-05 01:44:41 -04:00
parent 30a9139bc3
commit 9b64772775
24 changed files with 171 additions and 373 deletions
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63
src/audio/winmm/SDL_winmm.c
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@@ -155,42 +155,31 @@ WINMM_WaitDone(_THIS)
static void
WINMM_CloseDevice(_THIS)
{
/* Close up audio */
if (this->hidden != NULL) {
int i;
int i;
if (this->hidden->audio_sem) {
CloseHandle(this->hidden->audio_sem);
this->hidden->audio_sem = 0;
}
/* Clean up mixing buffers */
for (i = 0; i < NUM_BUFFERS; ++i) {
if (this->hidden->wavebuf[i].dwUser != 0xFFFF) {
waveOutUnprepareHeader(this->hidden->hout,
&this->hidden->wavebuf[i],
sizeof(this->hidden->wavebuf[i]));
this->hidden->wavebuf[i].dwUser = 0xFFFF;
}
}
/* Free raw mixing buffer */
SDL_free(this->hidden->mixbuf);
this->hidden->mixbuf = NULL;
if (this->hidden->hin) {
waveInClose(this->hidden->hin);
this->hidden->hin = 0;
}
if (this->hidden->hout) {
waveOutClose(this->hidden->hout);
this->hidden->hout = 0;
}
SDL_free(this->hidden);
this->hidden = NULL;
if (this->hidden->audio_sem) {
CloseHandle(this->hidden->audio_sem);
}
/* Clean up mixing buffers */
for (i = 0; i < NUM_BUFFERS; ++i) {
if (this->hidden->wavebuf[i].dwUser != 0xFFFF) {
waveOutUnprepareHeader(this->hidden->hout,
&this->hidden->wavebuf[i],
sizeof (this->hidden->wavebuf[i]));
}
}
if (this->hidden->hin) {
waveInClose(this->hidden->hin);
}
if (this->hidden->hout) {
waveOutClose(this->hidden->hout);
}
SDL_free(this->hidden->mixbuf);
SDL_free(this->hidden);
}
static SDL_bool
@@ -269,7 +258,6 @@ WINMM_OpenDevice(_THIS, void *handle, const char *devname, int iscapture)
}
if (!valid_datatype) {
WINMM_CloseDevice(this);
return SDL_SetError("Unsupported audio format");
}
@@ -288,7 +276,6 @@ WINMM_OpenDevice(_THIS, void *handle, const char *devname, int iscapture)
}
if (result != MMSYSERR_NOERROR) {
WINMM_CloseDevice(this);
return SetMMerror("waveOutOpen()", result);
}
#ifdef SOUND_DEBUG
@@ -299,7 +286,6 @@ WINMM_OpenDevice(_THIS, void *handle, const char *devname, int iscapture)
result = waveOutGetDevCaps((UINT) this->hidden->hout,
&caps, sizeof(caps));
if (result != MMSYSERR_NOERROR) {
WINMM_CloseDevice(this);
return SetMMerror("waveOutGetDevCaps()", result);
}
printf("Audio device: %s\n", caps.szPname);
@@ -310,7 +296,6 @@ WINMM_OpenDevice(_THIS, void *handle, const char *devname, int iscapture)
this->hidden->audio_sem =
CreateSemaphore(NULL, NUM_BUFFERS - 1, NUM_BUFFERS, NULL);
if (this->hidden->audio_sem == NULL) {
WINMM_CloseDevice(this);
return SDL_SetError("Couldn't create semaphore");
}
@@ -318,7 +303,6 @@ WINMM_OpenDevice(_THIS, void *handle, const char *devname, int iscapture)
this->hidden->mixbuf =
(Uint8 *) SDL_malloc(NUM_BUFFERS * this->spec.size);
if (this->hidden->mixbuf == NULL) {
WINMM_CloseDevice(this);
return SDL_OutOfMemory();
}
for (i = 0; i < NUM_BUFFERS; ++i) {
@@ -332,7 +316,6 @@ WINMM_OpenDevice(_THIS, void *handle, const char *devname, int iscapture)
&this->hidden->wavebuf[i],
sizeof(this->hidden->wavebuf[i]));
if (result != MMSYSERR_NOERROR) {
WINMM_CloseDevice(this);
return SetMMerror("waveOutPrepareHeader()", result);
}
}