111 lines
2.9 KiB
C++
111 lines
2.9 KiB
C++
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// Copyright (c) 2013 Google Inc. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "media/base/media_stream.h"
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#include "base/logging.h"
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#include "media/base/demuxer.h"
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#include "media/base/media_sample.h"
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#include "media/base/muxer.h"
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#include "media/base/stream_info.h"
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namespace media {
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MediaStream::MediaStream(scoped_refptr<StreamInfo> info, Demuxer* demuxer)
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: info_(info), demuxer_(demuxer), muxer_(NULL), state_(kIdle) {}
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MediaStream::~MediaStream() {}
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Status MediaStream::PullSample(scoped_refptr<MediaSample>* sample) {
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DCHECK_EQ(state_, kPulling);
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// Trigger a new parse in demuxer if no more samples.
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while (samples_.empty()) {
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Status status = demuxer_->Parse();
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if (!status.ok())
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return status;
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}
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*sample = samples_.front();
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samples_.pop_front();
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return Status::OK;
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}
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Status MediaStream::PushSample(const scoped_refptr<MediaSample>& sample) {
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switch (state_) {
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case kIdle:
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case kPulling:
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samples_.push_back(sample);
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return Status::OK;
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case kDisconnected:
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return Status::OK;
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case kPushing:
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return muxer_->AddSample(this, sample);
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default:
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NOTREACHED() << "Unexpected State " << state_;
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return Status::UNKNOWN;
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}
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}
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void MediaStream::Connect(Muxer* muxer) {
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DCHECK(muxer != NULL);
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DCHECK(muxer_ == NULL);
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state_ = kConnected;
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muxer_ = muxer;
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}
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Status MediaStream::Start(MediaStreamOperation operation) {
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DCHECK(demuxer_ != NULL);
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DCHECK(operation == kPush || operation == kPull);
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switch (state_) {
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case kIdle:
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// Disconnect the stream if it is not connected to a muxer.
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state_ = kDisconnected;
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samples_.clear();
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return Status::OK;
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case kConnected:
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state_ = (operation == kPush) ? kPushing : kPulling;
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if (operation == kPush) {
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// Push samples in the queue to muxer if there is any.
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while (!samples_.empty()) {
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Status status = muxer_->AddSample(this, samples_.front());
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if (!status.ok())
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return status;
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samples_.pop_front();
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}
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} else {
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// We need to disconnect all its peer streams which are not connected
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// to a muxer.
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for (int i = 0; i < demuxer_->num_streams(); ++i) {
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Status status = demuxer_->streams(i)->Start(operation);
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if (!status.ok())
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return status;
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}
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}
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return Status::OK;
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case kPulling:
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DCHECK(operation == kPull);
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return Status::OK;
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default:
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NOTREACHED() << "Unexpected State " << state_;
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return Status::UNKNOWN;
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}
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}
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scoped_refptr<StreamInfo> MediaStream::info() {
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return info_;
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}
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std::string MediaStream::ToString() const {
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std::ostringstream s;
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s << "state: " << state_
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<< " samples in the queue: " << samples_.size()
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<< " " << info_->ToString();
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return s.str();
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}
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} // namespace media
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