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Fix race conditions in the dsound2 player that occasionally resulted in audio playback stopping instantly

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Originally committed to SVN as r5856.
This commit is contained in:
Thomas Goyne 2011-11-16 19:55:31 +00:00
parent b16f1a0698
commit 672f420d6c
1 changed files with 45 additions and 45 deletions
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54
aegisub/src/audio_player_dsound2.cpp
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@ -46,8 +46,8 @@
#include <libaegisub/log.h>
#include "audio_controller.h"
#include "audio_player_dsound2.h"
#include "include/aegisub/audio_provider.h"
#include "frame_main.h"
#include "main.h"
@ -279,7 +279,13 @@ unsigned int __stdcall DirectSoundPlayer2Thread::ThreadProc(void *parameter)
}
/// Macro used to set error_message, error_happened and end the thread
#define REPORT_ERROR(msg) { error_message = "DirectSoundPlayer2Thread: " msg; SetEvent(error_happened); return; }
#define REPORT_ERROR(msg) \
{ \
ResetEvent(is_playing); \
error_message = "DirectSoundPlayer2Thread: " msg; \
SetEvent(error_happened); \
return; \
}
void DirectSoundPlayer2Thread::Run()
{
@ -364,7 +370,6 @@ void DirectSoundPlayer2Thread::Run()
{
// Start or restart playback
bfr->Stop();
ResetEvent(is_playing);
next_input_frame = start_frame;
@ -425,57 +430,41 @@ void DirectSoundPlayer2Thread::Run()
}
case WAIT_OBJECT_0+1:
{
stop_playback:
// Stop playing
bfr->Stop();
ResetEvent(is_playing);
playback_should_be_running = false;
break;
}
case WAIT_OBJECT_0+2:
{
// Set end frame
if (end_frame <= next_input_frame)
{
bfr->Stop();
ResetEvent(is_playing);
playback_should_be_running = false;
goto stop_playback;
}
else
{
// If the user is dragging the start or end point in the audio display
// the set end frame events might come in faster than the timeouts happen
// and then new data never get filled into the buffer. See bug #915.
goto do_fill_buffer;
}
break;
}
case WAIT_OBJECT_0+3:
{
// Change volume
// We aren't thread safe right now, filling the buffers grabs volume directly
// from the field set by the controlling thread, but it shouldn't be a major
// problem if race conditions do occur, just some momentary distortion.
goto do_fill_buffer;
}
case WAIT_OBJECT_0+4:
{
// Perform suicide
bfr->Stop();
ResetEvent(is_playing);
playback_should_be_running = false;
running = false;
break;
}
goto stop_playback;
case WAIT_TIMEOUT:
do_fill_buffer:
{
// Time to fill more into buffer
if (!playback_should_be_running)
break;
@ -487,10 +476,7 @@ do_fill_buffer:
{
// Not looping playback...
// hopefully we only triggered timeout after being done with the buffer
bfr->Stop();
ResetEvent(is_playing);
playback_should_be_running = false;
break;
goto stop_playback;
}
DWORD play_cursor;
@ -716,6 +702,20 @@ void DirectSoundPlayer2Thread::Play(int64_t start, int64_t count)
SetEvent(event_start_playback);
last_playback_restart = GetTickCount();
// Block until playback actually begins to avoid race conditions with
// checking if playback is in progress
HANDLE events_to_wait[] = { is_playing, error_happened };
switch (WaitForMultipleObjects(2, events_to_wait, FALSE, INFINITE))
{
case WAIT_OBJECT_0+0: // Playing
LOG_D("audio/player/dsound") << "Playback begun";
break;
case WAIT_OBJECT_0+1: // Error
throw error_message;
default:
throw "Unexpected result from WaitForMultipleObjects in DirectSoundPlayer2Thread::Play";
}
}
void DirectSoundPlayer2Thread::Stop()