webrtc/talk/media/base/videoframe.h

/*
 * libjingle
 * Copyright 2004 Google Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *  1. Redistributions of source code must retain the above copyright notice,
 *     this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright notice,
 *     this list of conditions and the following disclaimer in the documentation
 *     and/or other materials provided with the distribution.
 *  3. The name of the author may not be used to endorse or promote products
 *     derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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 */

#ifndef TALK_MEDIA_BASE_VIDEOFRAME_H_
#define TALK_MEDIA_BASE_VIDEOFRAME_H_

#include "talk/base/basictypes.h"
#include "talk/base/stream.h"

namespace cricket {

// Simple rotation constants.
enum {
  ROTATION_0 = 0,
  ROTATION_90 = 90,
  ROTATION_180 = 180,
  ROTATION_270 = 270
};

// Represents a YUV420 (a.k.a. I420) video frame.
class VideoFrame {
 public:
  VideoFrame() {}
  virtual ~VideoFrame() {}

  virtual bool InitToBlack(int w, int h, size_t pixel_width,
                           size_t pixel_height, int64 elapsed_time,
                           int64 time_stamp) = 0;
  // Creates a frame from a raw sample with FourCC |format| and size |w| x |h|.
  // |h| can be negative indicating a vertically flipped image.
  // |dw| is destination width; can be less than |w| if cropping is desired.
  // |dh| is destination height, like |dw|, but must be a positive number.
  // Returns whether the function succeeded or failed.
  virtual bool Reset(uint32 fourcc, int w, int h, int dw, int dh, uint8 *sample,
                     size_t sample_size, size_t pixel_width,
                     size_t pixel_height, int64 elapsed_time, int64 time_stamp,
                     int rotation) = 0;

  // Basic accessors.
  virtual size_t GetWidth() const = 0;
  virtual size_t GetHeight() const = 0;
  size_t GetChromaWidth() const { return (GetWidth() + 1) / 2; }
  size_t GetChromaHeight() const { return (GetHeight() + 1) / 2; }
  size_t GetChromaSize() const { return GetUPitch() * GetChromaHeight(); }
  // These can return NULL if the object is not backed by a buffer.
  virtual const uint8 *GetYPlane() const = 0;
  virtual const uint8 *GetUPlane() const = 0;
  virtual const uint8 *GetVPlane() const = 0;
  virtual uint8 *GetYPlane() = 0;
  virtual uint8 *GetUPlane() = 0;
  virtual uint8 *GetVPlane() = 0;

  virtual int32 GetYPitch() const = 0;
  virtual int32 GetUPitch() const = 0;
  virtual int32 GetVPitch() const = 0;

  // Returns the handle of the underlying video frame. This is used when the
  // frame is backed by a texture. The object should be destroyed when it is no
  // longer in use, so the underlying resource can be freed.
  virtual void* GetNativeHandle() const = 0;

  // For retrieving the aspect ratio of each pixel. Usually this is 1x1, but
  // the aspect_ratio_idc parameter of H.264 can specify non-square pixels.
  virtual size_t GetPixelWidth() const = 0;
  virtual size_t GetPixelHeight() const = 0;

  virtual int64 GetElapsedTime() const = 0;
  virtual int64 GetTimeStamp() const = 0;
  virtual void SetElapsedTime(int64 elapsed_time) = 0;
  virtual void SetTimeStamp(int64 time_stamp) = 0;

  // Indicates the rotation angle in degrees.
  virtual int GetRotation() const = 0;

  // Make a shallow copy of the frame. The frame buffer itself is not copied.
  // Both the current and new VideoFrame will share a single reference-counted
  // frame buffer.
  virtual VideoFrame *Copy() const = 0;

  // Since VideoFrame supports shallow copy and the internal frame buffer might
  // be shared, in case VideoFrame needs exclusive access of the frame buffer,
  // user can call MakeExclusive() to make sure the frame buffer is exclusive
  // accessable to the current object.  This might mean a deep copy of the frame
  // buffer if it is currently shared by other objects.
  virtual bool MakeExclusive() = 0;

  // Writes the frame into the given frame buffer, provided that it is of
  // sufficient size. Returns the frame's actual size, regardless of whether
  // it was written or not (like snprintf). If there is insufficient space,
  // nothing is written.
  virtual size_t CopyToBuffer(uint8 *buffer, size_t size) const = 0;

  // Writes the frame into the given planes, stretched to the given width and
  // height. The parameter "interpolate" controls whether to interpolate or just
  // take the nearest-point. The parameter "crop" controls whether to crop this
  // frame to the aspect ratio of the given dimensions before stretching.
  virtual bool CopyToPlanes(
      uint8* dst_y, uint8* dst_u, uint8* dst_v,
      int32 dst_pitch_y, int32 dst_pitch_u, int32 dst_pitch_v) const;

  // Writes the frame into the target VideoFrame.
  virtual void CopyToFrame(VideoFrame* target) const;

  // Writes the frame into the given stream and returns the StreamResult.
  // See talk/base/stream.h for a description of StreamResult and error.
  // Error may be NULL. If a non-success value is returned from
  // StreamInterface::Write(), we immediately return with that value.
  virtual talk_base::StreamResult Write(talk_base::StreamInterface *stream,
                                        int *error);

  // Converts the I420 data to RGB of a certain type such as ARGB and ABGR.
  // Returns the frame's actual size, regardless of whether it was written or
  // not (like snprintf). Parameters size and stride_rgb are in units of bytes.
  // If there is insufficient space, nothing is written.
  virtual size_t ConvertToRgbBuffer(uint32 to_fourcc, uint8 *buffer,
                                    size_t size, int stride_rgb) const = 0;

  // Writes the frame into the given planes, stretched to the given width and
  // height. The parameter "interpolate" controls whether to interpolate or just
  // take the nearest-point. The parameter "crop" controls whether to crop this
  // frame to the aspect ratio of the given dimensions before stretching.
  virtual void StretchToPlanes(
      uint8 *y, uint8 *u, uint8 *v, int32 pitchY, int32 pitchU, int32 pitchV,
      size_t width, size_t height, bool interpolate, bool crop) const;

  // Writes the frame into the given frame buffer, stretched to the given width
  // and height, provided that it is of sufficient size. Returns the frame's
  // actual size, regardless of whether it was written or not (like snprintf).
  // If there is insufficient space, nothing is written. The parameter
  // "interpolate" controls whether to interpolate or just take the
  // nearest-point. The parameter "crop" controls whether to crop this frame to
  // the aspect ratio of the given dimensions before stretching.
  virtual size_t StretchToBuffer(size_t w, size_t h, uint8 *buffer, size_t size,
                                 bool interpolate, bool crop) const;

  // Writes the frame into the target VideoFrame, stretched to the size of that
  // frame. The parameter "interpolate" controls whether to interpolate or just
  // take the nearest-point. The parameter "crop" controls whether to crop this
  // frame to the aspect ratio of the target frame before stretching.
  virtual void StretchToFrame(VideoFrame *target, bool interpolate,
                              bool crop) const;

  // Stretches the frame to the given size, creating a new VideoFrame object to
  // hold it. The parameter "interpolate" controls whether to interpolate or
  // just take the nearest-point. The parameter "crop" controls whether to crop
  // this frame to the aspect ratio of the given dimensions before stretching.
  virtual VideoFrame *Stretch(size_t w, size_t h, bool interpolate,
                              bool crop) const;

  // Sets the video frame to black.
  virtual bool SetToBlack();

  // Tests if sample is valid.  Returns true if valid.
  static bool Validate(uint32 fourcc, int w, int h, const uint8 *sample,
                       size_t sample_size);

  // Size of an I420 image of given dimensions when stored as a frame buffer.
  static size_t SizeOf(size_t w, size_t h) {
    return w * h + ((w + 1) / 2) * ((h + 1) / 2) * 2;
  }

 protected:
  // Creates an empty frame.
  virtual VideoFrame *CreateEmptyFrame(int w, int h, size_t pixel_width,
                                       size_t pixel_height, int64 elapsed_time,
                                       int64 time_stamp) const = 0;
};

}  // namespace cricket

#endif  // TALK_MEDIA_BASE_VIDEOFRAME_H_