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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_CAST_VIDEO_SENDER_CODECS_VP8_VP8_ENCODER_H_
#define MEDIA_CAST_VIDEO_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 "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:
Vp8Encoder(const VideoSenderConfig& video_config, uint8 max_unacked_frames);
~Vp8Encoder();
// Initialize the encoder before Encode() can be called. This method
// must be called on the thread that Encode() is called.
void Initialize();
// Encode a raw image (as a part of a video stream).
bool Encode(const scoped_refptr<media::VideoFrame>& video_frame,
transport::EncodedVideoFrame* encoded_image);
// Update the encoder with a new target bit rate.
void UpdateRates(uint32 new_bitrate);
// Set the next frame to be a key frame.
void GenerateKeyFrame();
void LatestFrameIdToReference(uint32 frame_id);
private:
enum Vp8Buffers {
kAltRefBuffer = 0,
kGoldenBuffer = 1,
kLastBuffer = 2,
kNoBuffer = 3 // Note: must be last.
};
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();
// Calculate which previous frame to reference.
uint32 GetLatestFrameIdToReference();
// Get encoder flags for our referenced encoder buffers.
void 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_;
const int max_number_of_repeated_buffers_in_a_row_;
// 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 used_buffers_frame_id_[kNumberOfVp8VideoBuffers];
bool acked_frame_buffers_[kNumberOfVp8VideoBuffers];
Vp8Buffers last_used_vp8_buffer_;
int number_of_repeated_buffers_;
// 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_VIDEO_SENDER_CODECS_VP8_VP8_ENCODER_H_
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