Add support for external video renderers in mojo.

media/mojo/services/demuxer_stream_provider_shim.cc

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "media/mojo/services/demuxer_stream_provider_shim.h"
+
+#include "base/bind.h"
+#include "base/bind_helpers.h"
+#include "base/callback_helpers.h"
+
+namespace media {
+
+DemuxerStreamProviderShim::DemuxerStreamProviderShim(
+    mojo::DemuxerStreamPtr audio,
+    mojo::DemuxerStreamPtr video,
+    const base::Closure& demuxer_ready_cb)
+    : demuxer_ready_cb_(demuxer_ready_cb),
+      streams_ready_(0),
+      weak_factory_(this) {
+  DCHECK(audio || video);
+  DCHECK(!demuxer_ready_cb_.is_null());
+
+  if (audio) {
+    streams_.push_back(new MojoDemuxerStreamAdapter(
+        audio.Pass(),
+        base::Bind(&DemuxerStreamProviderShim::OnStreamReady,
+                   weak_factory_.GetWeakPtr())));
+  }
+
+  if (video) {
+    streams_.push_back(new MojoDemuxerStreamAdapter(
+        video.Pass(),
+        base::Bind(&DemuxerStreamProviderShim::OnStreamReady,
+                   weak_factory_.GetWeakPtr())));
+  }
+}
+
+DemuxerStreamProviderShim::~DemuxerStreamProviderShim() {
+}
+
+DemuxerStream* DemuxerStreamProviderShim::GetStream(DemuxerStream::Type type) {
+  DCHECK(demuxer_ready_cb_.is_null());
+  for (auto* stream : streams_) {
+    if (stream->type() == type)
+      return stream;
+  }
+
+  return nullptr;
+}
+
+DemuxerStreamProvider::Liveness DemuxerStreamProviderShim::GetLiveness() const {
+  // TODO(dalecurtis): This should be removed once liveness lives elsewhere, see
+  // http://crbug.com/420025
+  return DemuxerStreamProvider::LIVENESS_UNKNOWN;
+}
+
+void DemuxerStreamProviderShim::OnStreamReady() {
+  if (++streams_ready_ == streams_.size())
+    base::ResetAndReturn(&demuxer_ready_cb_).Run();
+}
+
+}  // namespace media