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// Copyright (c) 2012 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 "base/basictypes.h"
#include "base/callback.h"
#include "base/time.h"
#include "cobalt/media/base/buffering_state.h"
#include "cobalt/media/base/media_export.h"
#include "cobalt/media/base/pipeline_status.h"
namespace cobalt {
namespace media {
class CdmContext;
class DemuxerStream;
class RendererClient;
class TimeSource;
class MEDIA_EXPORT AudioRenderer {
// Stop all operations and fire all pending callbacks.
virtual ~AudioRenderer();
// Initialize an AudioRenderer with |stream|, executing |init_cb| upon
// completion. If initialization fails, only |init_cb|
// (not RendererClient::OnError) will be called.
// |cdm_context| can be used to handle encrypted streams. May be null if the
// stream is not encrypted.
virtual void Initialize(DemuxerStream* stream, CdmContext* cdm_context,
RendererClient* client,
const PipelineStatusCB& init_cb) = 0;
// Returns the TimeSource associated with audio rendering.
virtual TimeSource* GetTimeSource() = 0;
// Discard any audio data, executing |callback| when completed.
// Clients should expect |buffering_state_cb| to be called with
// BUFFERING_HAVE_NOTHING while flushing is in progress.
virtual void Flush(const base::Closure& callback) = 0;
// Starts playback by reading from |stream| and decoding and rendering audio.
// Only valid to call after a successful Initialize() or Flush().
virtual void StartPlaying() = 0;
// Sets the output volume.
virtual void SetVolume(float volume) = 0;
} // namespace media
} // namespace cobalt