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// Copyright 2013 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.
#ifndef MEDIA_VIDEO_ENCODED_VIDEO_SOURCE_H_
#define MEDIA_VIDEO_ENCODED_VIDEO_SOURCE_H_
#include "base/memory/ref_counted.h"
#include "media/base/encoded_bitstream_buffer.h"
#include "media/video/video_encode_types.h"
namespace media {
// Class to represent any encoded video source. Anything that provides encoded
// video can be an EncodedVideoSource. Notable examples of this can be video
// encoder and webcam that has encoding capabilities.
// TODO(hshi): merge this with VEA interface. http://crbug.com/248334.
class EncodedVideoSource {
public:
class Client {
public:
// Notifies client that bitstream is opened successfully. The |params|
// contains the actual encoding parameters chosen by the browser process.
// It may be different from the params requested in OpenBitstream().
virtual void OnOpened(const VideoEncodingParameters& params) = 0;
// Notifies client that bitstream is closed. After this call it is
// guaranteed that client will not receive further calls.
virtual void OnClosed() = 0;
// Delivers an encoded bitstream buffer to the client.
virtual void OnBufferReady(
scoped_refptr<const EncodedBitstreamBuffer> buffer) = 0;
// Notifies client that encoding parameters has changed. The |params|
// contains the current encoding parameters chosen by the browser process.
// It may be different from the params requested in TrySetBitstreamConfig().
virtual void OnConfigChanged(
const RuntimeVideoEncodingParameters& params) = 0;
};
// Callback is invoked once RequestCapabilities() is complete.
typedef base::Callback<void(const VideoEncodingCapabilities& capabilities)>
RequestCapabilitiesCallback;
// RequestCapabilities initiates an asynchronous query for the types of
// encoded bitstream supported by the encoder. This call should be invoked
// only once. EncodedVideoSource will invoke |callback| when capabilities
// become available.
virtual void RequestCapabilities(
const RequestCapabilitiesCallback& callback) = 0;
// OpenBitstream opens the bitstream on the encoded video source. Only one
// bitstream can be opened for an encoded video source.
virtual void OpenBitstream(Client* client,
const VideoEncodingParameters& params) = 0;
// CloseBitstream closes the bitstream.
virtual void CloseBitstream() = 0;
// ReturnBitstreamBuffer notifies that the data within the buffer has been
// processed and it can be reused to encode upcoming bitstream.
virtual void ReturnBitstreamBuffer(
scoped_refptr<const media::EncodedBitstreamBuffer> buffer) = 0;
// TrySetBitstreamConfig requests to change encoding parameters. Old config
// must be considered valid until OnConfigChanged is invoked on the client
// signaling successful change.
virtual void TrySetBitstreamConfig(
const RuntimeVideoEncodingParameters& params) = 0;
};
} // namespace media
#endif // MEDIA_VIDEO_ENCODED_VIDEO_SOURCE_H_
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