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// 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.
#ifndef MEDIA_CAST_SENDER_CODECS_VP8_VP8_ENCODER_H_
#define MEDIA_CAST_SENDER_CODECS_VP8_VP8_ENCODER_H_
#include <stdint.h>
#include "base/macros.h"
#include "base/memory/scoped_ptr.h"
#include "base/threading/thread_checker.h"
#include "media/capture/content/feedback_signal_accumulator.cc"
#include "media/cast/cast_config.h"
#include "media/cast/sender/software_video_encoder.h"
#include "third_party/libvpx/source/libvpx/vpx/vpx_encoder.h"
#include "ui/gfx/geometry/size.h"
namespace media {
class VideoFrame;
}
namespace media {
namespace cast {
class Vp8Encoder : public SoftwareVideoEncoder {
public:
explicit Vp8Encoder(const VideoSenderConfig& video_config);
~Vp8Encoder() final;
// SoftwareVideoEncoder implementations.
void Initialize() final;
void Encode(const scoped_refptr<media::VideoFrame>& video_frame,
const base::TimeTicks& reference_time,
SenderEncodedFrame* encoded_frame) final;
void UpdateRates(uint32_t new_bitrate) final;
void GenerateKeyFrame() final;
private:
bool is_initialized() const {
// ConfigureForNewFrameSize() sets the timebase denominator value to
// non-zero if the encoder is successfully initialized, and it is zero
// otherwise.
return config_.g_timebase.den != 0;
}
// If the |encoder_| is live, attempt reconfiguration to allow it to encode
// frames at a new |frame_size|. Otherwise, tear it down and re-create a new
// |encoder_| instance.
void ConfigureForNewFrameSize(const gfx::Size& frame_size);
const VideoSenderConfig cast_config_;
const double target_deadline_utilization_;
// VP8 internal objects. These are valid for use only while is_initialized()
// returns true.
vpx_codec_enc_cfg_t config_;
vpx_codec_ctx_t encoder_;
// Set to true to request the next frame emitted by Vp8Encoder be a key frame.
bool key_frame_requested_;
// Saves the current bitrate setting, for when the |encoder_| is reconfigured
// for different frame sizes.
int bitrate_kbit_;
// The |VideoFrame::timestamp()| of the last encoded frame. This is used to
// predict the duration of the next frame.
base::TimeDelta last_frame_timestamp_;
// The last encoded frame's ID.
uint32_t last_encoded_frame_id_;
// This is bound to the thread where Initialize() is called.
base::ThreadChecker thread_checker_;
// Set to true once a frame with zero-length encoded data has been
// encountered.
// TODO(miu): Remove after discovering cause. http://crbug.com/519022
bool has_seen_zero_length_encoded_frame_;
// The accumulator (time averaging) of the encoding speed.
FeedbackSignalAccumulator<base::TimeDelta> encoding_speed_acc_;
// The higher the speed, the less CPU usage, and the lower quality.
int encoding_speed_;
DISALLOW_COPY_AND_ASSIGN(Vp8Encoder);
};
} // namespace cast
} // namespace media
#endif // MEDIA_CAST_SENDER_CODECS_VP8_VP8_ENCODER_H_
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