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80 lines
2.2 KiB
C++
80 lines
2.2 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:set ts=2 sw=2 sts=2 et cindent: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "MP4Stream.h"
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#include "MediaResource.h"
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namespace mozilla {
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MP4Stream::MP4Stream(MediaResource* aResource, Monitor* aDemuxerMonitor)
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: mResource(aResource)
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, mDemuxerMonitor(aDemuxerMonitor)
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{
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MOZ_COUNT_CTOR(MP4Stream);
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MOZ_ASSERT(aResource);
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}
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MP4Stream::~MP4Stream()
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{
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MOZ_COUNT_DTOR(MP4Stream);
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}
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bool
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MP4Stream::ReadAt(int64_t aOffset, void* aBuffer, size_t aCount,
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size_t* aBytesRead)
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{
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// The read call can acquire various monitors, including both the decoder
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// monitor and gMediaCache's monitor. So we need to unlock ours to avoid
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// deadlock.
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mDemuxerMonitor->AssertCurrentThreadOwns();
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MonitorAutoUnlock unlock(*mDemuxerMonitor);
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uint32_t sum = 0;
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uint32_t bytesRead = 0;
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do {
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uint64_t offset = aOffset + sum;
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char* buffer = reinterpret_cast<char*>(aBuffer) + sum;
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uint32_t toRead = aCount - sum;
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nsresult rv = mResource->ReadAt(offset, buffer, toRead, &bytesRead);
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if (NS_FAILED(rv)) {
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return false;
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}
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sum += bytesRead;
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} while (sum < aCount && bytesRead > 0);
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*aBytesRead = sum;
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return true;
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}
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bool
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MP4Stream::CachedReadAt(int64_t aOffset, void* aBuffer, size_t aCount,
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size_t* aBytesRead)
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{
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// The read call can acquire various monitors, including both the decoder
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// monitor and gMediaCache's monitor. So we need to unlock ours to avoid
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// deadlock.
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mDemuxerMonitor->AssertCurrentThreadOwns();
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MonitorAutoUnlock unlock(*mDemuxerMonitor);
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nsresult rv = mResource->ReadFromCache(reinterpret_cast<char*>(aBuffer),
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aOffset, aCount);
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if (NS_FAILED(rv)) {
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*aBytesRead = 0;
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return false;
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}
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*aBytesRead = aCount;
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return true;
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}
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bool
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MP4Stream::Length(int64_t* aSize)
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{
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if (mResource->GetLength() < 0)
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return false;
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*aSize = mResource->GetLength();
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return true;
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}
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}
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