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Prevent underflow during audio frame drop calculation

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This commit is contained in:
Cameron Gutman
2018-08-14 17:39:29 -07:00
parent cf2d8f71d6
commit c9bf5ae79d
1 changed files with 7 additions and 5 deletions
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12
app/streaming/audio.cpp
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@@ -182,8 +182,13 @@ void Session::sdlAudioDecodeAndPlaySample(char* sampleData, int sampleLength)
Uint32 queuedAudio = qMax((int)SDL_GetQueuedAudioSize(s_AudioDevice) - (int)s_BaselinePendingData, 0);
Uint32 framesQueued = queuedAudio / (SAMPLES_PER_FRAME * s_ChannelCount * sizeof(short));
// We must check this prior to the below checks to ensure we don't
// underflow if framesQueued - s_PendingHardDrops < 0.
if (framesQueued <= MIN_QUEUED_FRAMES) {
s_PendingDrops = s_PendingHardDrops = 0;
}
// Pend enough drops to get us back to MIN_QUEUED_FRAMES
if (framesQueued - s_PendingHardDrops > STOP_THE_WORLD_LIMIT) {
else if (framesQueued - s_PendingHardDrops > STOP_THE_WORLD_LIMIT) {
s_PendingHardDrops = framesQueued - MIN_QUEUED_FRAMES;
SDL_LogInfo(SDL_LOG_CATEGORY_APPLICATION,
"Pending hard drop of %u audio frames",
@@ -194,10 +199,7 @@ void Session::sdlAudioDecodeAndPlaySample(char* sampleData, int sampleLength)
}
// Determine if this frame should be dropped
if (framesQueued <= MIN_QUEUED_FRAMES) {
s_PendingDrops = s_PendingHardDrops = 0;
}
else if (s_PendingHardDrops != 0) {
if (s_PendingHardDrops != 0) {
// Hard drops happen all at once to forcefully
// resync with the source.
s_PendingHardDrops--;