webrtc/modules/video_coding/codecs/i420/include/i420.h

/*
 *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */

#ifndef WEBRTC_MODULES_VIDEO_CODING_CODECS_I420_INCLUDE_I420_H_
#define WEBRTC_MODULES_VIDEO_CODING_CODECS_I420_INCLUDE_I420_H_

#include <vector>

#include "webrtc/base/checks.h"
#include "webrtc/modules/video_coding/include/video_codec_interface.h"
#include "webrtc/typedefs.h"

namespace webrtc {

class I420Encoder : public VideoEncoder {
 public:
  I420Encoder();

  virtual ~I420Encoder();

  // Initialize the encoder with the information from the VideoCodec.
  //
  // Input:
  //          - codecSettings     : Codec settings.
  //          - numberOfCores     : Number of cores available for the encoder.
  //          - maxPayloadSize    : The maximum size each payload is allowed
  //                                to have. Usually MTU - overhead.
  //
  // Return value                 : WEBRTC_VIDEO_CODEC_OK if OK.
  //                                <0 - Error
  int InitEncode(const VideoCodec* codecSettings,
                 int /*numberOfCores*/,
                 size_t /*maxPayloadSize*/) override;

  // "Encode" an I420 image (as a part of a video stream). The encoded image
  // will be returned to the user via the encode complete callback.
  //
  // Input:
  //          - inputImage        : Image to be encoded.
  //          - codecSpecificInfo : Pointer to codec specific data.
  //          - frameType         : Frame type to be sent (Key /Delta).
  //
  // Return value                 : WEBRTC_VIDEO_CODEC_OK if OK.
  //                                <0 - Error
  int Encode(const VideoFrame& inputImage,
             const CodecSpecificInfo* /*codecSpecificInfo*/,
             const std::vector<FrameType>* /*frame_types*/) override;

  // Register an encode complete callback object.
  //
  // Input:
  //          - callback         : Callback object which handles encoded images.
  //
  // Return value                : WEBRTC_VIDEO_CODEC_OK if OK, < 0 otherwise.
  int RegisterEncodeCompleteCallback(EncodedImageCallback* callback) override;

  // Free encoder memory.
  //
  // Return value                : WEBRTC_VIDEO_CODEC_OK if OK, < 0 otherwise.
  int Release() override;

  int SetChannelParameters(uint32_t /*packetLoss*/, int64_t /*rtt*/) override {
    return WEBRTC_VIDEO_CODEC_OK;
  }

 private:
  static uint8_t* InsertHeader(uint8_t* buffer,
                               uint16_t width,
                               uint16_t height);

  bool _inited;
  EncodedImage _encodedImage;
  EncodedImageCallback* _encodedCompleteCallback;
};  // class I420Encoder

class I420Decoder : public VideoDecoder {
 public:
  I420Decoder();

  virtual ~I420Decoder();

  // Initialize the decoder.
  // The user must notify the codec of width and height values.
  //
  // Return value         :  WEBRTC_VIDEO_CODEC_OK.
  //                        <0 - Errors
  int InitDecode(const VideoCodec* codecSettings,
                 int /*numberOfCores*/) override;

  // Decode encoded image (as a part of a video stream). The decoded image
  // will be returned to the user through the decode complete callback.
  //
  // Input:
  //          - inputImage        : Encoded image to be decoded
  //          - missingFrames     : True if one or more frames have been lost
  //                                since the previous decode call.
  //          - codecSpecificInfo : pointer to specific codec data
  //          - renderTimeMs      : Render time in Ms
  //
  // Return value                 : WEBRTC_VIDEO_CODEC_OK if OK
  //                                 <0 - Error
  int Decode(const EncodedImage& inputImage,
             bool missingFrames,
             const RTPFragmentationHeader* /*fragmentation*/,
             const CodecSpecificInfo* /*codecSpecificInfo*/,
             int64_t /*renderTimeMs*/) override;

  // Register a decode complete callback object.
  //
  // Input:
  //          - callback         : Callback object which handles decoded images.
  //
  // Return value                : WEBRTC_VIDEO_CODEC_OK if OK, < 0 otherwise.
  int RegisterDecodeCompleteCallback(DecodedImageCallback* callback) override;

  // Free decoder memory.
  //
  // Return value                : WEBRTC_VIDEO_CODEC_OK if OK.
  //                                  <0 - Error
  int Release() override;

 private:
  static const uint8_t* ExtractHeader(const uint8_t* buffer,
                                      uint16_t* width,
                                      uint16_t* height);

  int _width;
  int _height;
  bool _inited;
  DecodedImageCallback* _decodeCompleteCallback;
};  // class I420Decoder

}  // namespace webrtc

#endif  // WEBRTC_MODULES_VIDEO_CODING_CODECS_I420_INCLUDE_I420_H_