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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 "base/basictypes.h"
#include "base/memory/scoped_ptr.h"
#include "base/threading/thread_checker.h"
#include "base/time/time.h"
#include "media/cast/cast_config.h"
#include "media/cast/sender/software_video_encoder.h"
#include "third_party/libvpx/source/libvpx/vpx/vpx_encoder.h"
namespace media {
class VideoFrame;
}
// VPX forward declaration.
typedef struct vpx_codec_ctx vpx_enc_ctx_t;
namespace media {
namespace cast {
const int kNumberOfVp8VideoBuffers = 3;
class Vp8Encoder : public SoftwareVideoEncoder {
public:
Vp8Encoder(const VideoSenderConfig& video_config, int max_unacked_frames);
virtual ~Vp8Encoder();
// Initialize the encoder before Encode() can be called. This method
// must be called on the thread that Encode() is called.
virtual void Initialize() OVERRIDE;
// Encode a raw image (as a part of a video stream).
virtual bool Encode(const scoped_refptr<media::VideoFrame>& video_frame,
EncodedFrame* encoded_image) OVERRIDE;
// Update the encoder with a new target bit rate.
virtual void UpdateRates(uint32 new_bitrate) OVERRIDE;
// Set the next frame to be a key frame.
virtual void GenerateKeyFrame() OVERRIDE;
virtual void LatestFrameIdToReference(uint32 frame_id) OVERRIDE;
private:
enum Vp8Buffers {
kAltRefBuffer = 0,
kGoldenBuffer = 1,
kLastBuffer = 2,
kNoBuffer = 3 // Note: must be last.
};
enum Vp8BufferState {
kBufferStartState,
kBufferSent,
kBufferAcked
};
struct BufferState {
uint32 frame_id;
Vp8BufferState state;
};
void InitEncode(int number_of_cores);
// Calculate the max target in % for a keyframe.
uint32 MaxIntraTarget(uint32 optimal_buffer_size) const;
// Calculate which next Vp8 buffers to update with the next frame.
Vp8Buffers GetNextBufferToUpdate();
// Get encoder flags for our referenced encoder buffers.
// Return which previous frame to reference.
uint32 GetCodecReferenceFlags(vpx_codec_flags_t* flags);
// Get encoder flags for our encoder buffers to update with next frame.
void GetCodecUpdateFlags(Vp8Buffers buffer_to_update,
vpx_codec_flags_t* flags);
const VideoSenderConfig cast_config_;
const bool use_multiple_video_buffers_;
// VP8 internal objects.
scoped_ptr<vpx_codec_enc_cfg_t> config_;
scoped_ptr<vpx_enc_ctx_t> encoder_;
vpx_image_t* raw_image_;
bool key_frame_requested_;
bool first_frame_received_;
base::TimeDelta first_frame_timestamp_;
uint32 last_encoded_frame_id_;
uint32 last_acked_frame_id_;
uint32 frame_id_to_reference_;
uint32 undroppable_frames_;
BufferState buffer_state_[kNumberOfVp8VideoBuffers];
// This is bound to the thread where Initialize() is called.
base::ThreadChecker thread_checker_;
DISALLOW_COPY_AND_ASSIGN(Vp8Encoder);
};
} // namespace cast
} // namespace media
#endif // MEDIA_CAST_SENDER_CODECS_VP8_VP8_ENCODER_H_
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