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Bug 687972. Set mCacheSuspended/mChannelEnded flags on all streams *before* calling CacheClientSeek/Resume/Suspend on any stream, because nsMediaChannelStream::CacheClientSuspend will call nsBuiltinDecoder::NotifySuspendedStatusChanged which will call nsMediaChannelStream::IsSuspendedByCache which will call nsMediaCacheStream::AreAllStreamsForResourceSuspended which relies on mCacheSuspended/mChannelEnded being set correctly for all streams for that resource. r=doublec

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This commit is contained in:
Robert O'Callahan 2011-12-02 17:43:42 +13:00
parent d06687ed59
commit c81f0548a8
1 changed files with 33 additions and 16 deletions
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49
content/media/nsMediaCache.cpp
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@ -1077,7 +1077,7 @@ nsMediaCache::PredictNextUseForIncomingData(nsMediaCacheStream* aStream)
NS_MIN<PRInt64>(millisecondsAhead, PR_INT32_MAX));
}
enum StreamAction { NONE, SEEK, RESUME, SUSPEND };
enum StreamAction { NONE, SEEK, SEEK_AND_RESUME, RESUME, SUSPEND };
void
nsMediaCache::Update()
@ -1322,7 +1322,7 @@ nsMediaCache::Update()
// because we don't want to think we have part of a block already
// in mPartialBlockBuffer.
stream->mChannelOffset = (desiredOffset/BLOCK_SIZE)*BLOCK_SIZE;
actions[i] = SEEK;
actions[i] = stream->mCacheSuspended ? SEEK_AND_RESUME : SEEK;
} else if (enableReading && stream->mCacheSuspended) {
actions[i] = RESUME;
} else if (!enableReading && !stream->mCacheSuspended) {
@ -1339,38 +1339,55 @@ nsMediaCache::Update()
// other cache state. That's OK, they'll trigger new Update events and we'll
// get back here and revise our decisions. The important thing here is that
// performing these actions only depends on mChannelOffset and
// mCacheSuspended, which can only be written by the main thread (i.e., this
// the action, which can only be written by the main thread (i.e., this
// thread), so we don't have races here.
// First, update the mCacheSuspended/mCacheEnded flags so that they're all correct
// when we fire our CacheClient commands below. Those commands can rely on these flags
// being set correctly for all streams.
for (PRUint32 i = 0; i < mStreams.Length(); ++i) {
nsMediaCacheStream* stream = mStreams[i];
nsresult rv = NS_OK;
switch (actions[i]) {
case SEEK:
LOG(PR_LOG_DEBUG, ("Stream %p CacheSeek to %lld (resume=%d)", stream,
(long long)stream->mChannelOffset, stream->mCacheSuspended));
rv = stream->mClient->CacheClientSeek(stream->mChannelOffset,
stream->mCacheSuspended);
case SEEK_AND_RESUME:
stream->mCacheSuspended = false;
stream->mChannelEnded = false;
break;
case RESUME:
LOG(PR_LOG_DEBUG, ("Stream %p Resumed", stream));
rv = stream->mClient->CacheClientResume();
stream->mCacheSuspended = false;
break;
case SUSPEND:
LOG(PR_LOG_DEBUG, ("Stream %p Suspended", stream));
rv = stream->mClient->CacheClientSuspend();
stream->mCacheSuspended = true;
break;
default:
break;
}
stream->mHasHadUpdate = true;
}
for (PRUint32 i = 0; i < mStreams.Length(); ++i) {
nsMediaCacheStream* stream = mStreams[i];
nsresult rv;
switch (actions[i]) {
case SEEK:
case SEEK_AND_RESUME:
LOG(PR_LOG_DEBUG, ("Stream %p CacheSeek to %lld (resume=%d)", stream,
(long long)stream->mChannelOffset, actions[i] == SEEK_AND_RESUME));
rv = stream->mClient->CacheClientSeek(stream->mChannelOffset,
actions[i] == SEEK_AND_RESUME);
break;
case RESUME:
LOG(PR_LOG_DEBUG, ("Stream %p Resumed", stream));
rv = stream->mClient->CacheClientResume();
break;
case SUSPEND:
LOG(PR_LOG_DEBUG, ("Stream %p Suspended", stream));
rv = stream->mClient->CacheClientSuspend();
break;
default:
rv = NS_OK;
break;
}
if (NS_FAILED(rv)) {
// Close the streams that failed due to error. This will cause all