vpx/vp8.h

   1 /*
   2  *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
   3  *
   4  *  Use of this source code is governed by a BSD-style license
   5  *  that can be found in the LICENSE file in the root of the source
   6  *  tree. An additional intellectual property rights grant can be found
   7  *  in the file PATENTS.  All contributing project authors may
   8  *  be found in the AUTHORS file in the root of the source tree.
   9  */
  10
  11
  12 /*!\defgroup vp8 VP8
  13  * \ingroup codecs
  14  * VP8 is vpx's newest video compression algorithm that uses motion
  15  * compensated prediction, Discrete Cosine Transform (DCT) coding of the
  16  * prediction error signal and context dependent entropy coding techniques
  17  * based on arithmetic principles. It features:
  18  *  - YUV 4:2:0 image format
  19  *  - Macro-block based coding (16x16 luma plus two 8x8 chroma)
  20  *  - 1/4 (1/8) pixel accuracy motion compensated prediction
  21  *  - 4x4 DCT transform
  22  *  - 128 level linear quantizer
  23  *  - In loop deblocking filter
  24  *  - Context-based entropy coding
  25  *
  26  * @{
  27  */
  28 /*!\file
  29  * \brief Provides controls common to both the VP8 encoder and decoder.
  30  */
  31 #ifndef VP8_H
  32 #define VP8_H
  33 #include "vpx/vpx_codec_impl_top.h"
  34
  35 /*!\brief Control functions
  36  *
  37  * The set of macros define the control functions of VP8 interface
  38  */
  39 enum vp8_com_control_id
  40 {
  41     VP8_SET_REFERENCE           = 1,    /**< pass in an external frame into decoder to be used as reference frame */
  42     VP8_COPY_REFERENCE          = 2,    /**< get a copy of reference frame from the decoder */
  43     VP8_SET_POSTPROC            = 3,    /**< set the decoder's post processing settings  */
  44     VP8_SET_DBG_COLOR_REF_FRAME = 4,    /**< set the reference frames to color for each macroblock */
  45     VP8_SET_DBG_COLOR_MB_MODES  = 5,    /**< set which macro block modes to color */
  46     VP8_SET_DBG_COLOR_B_MODES   = 6,    /**< set which blocks modes to color */
  47     VP8_SET_DBG_DISPLAY_MV      = 7,    /**< set which motion vector modes to draw */
  48     VP8_COMMON_CTRL_ID_MAX,
  49     VP8_DECODER_CTRL_ID_START   = 256,
  50 };
  51
  52 /*!\brief post process flags
  53  *
  54  * The set of macros define VP8 decoder post processing flags
  55  */
  56 enum vp8_postproc_level
  57 {
  58     VP8_NOFILTERING             = 0,
  59     VP8_DEBLOCK                 = 1<<0,
  60     VP8_DEMACROBLOCK            = 1<<1,
  61     VP8_ADDNOISE                = 1<<2,
  62     VP8_DEBUG_TXT_FRAME_INFO    = 1<<3, /**< print frame information */
  63     VP8_DEBUG_TXT_MBLK_MODES    = 1<<4, /**< print macro block modes over each macro block */
  64     VP8_DEBUG_TXT_DC_DIFF       = 1<<5, /**< print dc diff for each macro block */
  65     VP8_DEBUG_TXT_RATE_INFO     = 1<<6, /**< print video rate info (encoder only) */
  66 };
  67
  68 /*!\brief post process flags
  69  *
  70  * This define a structure that describe the post processing settings. For
  71  * the best objective measure (using the PSNR metric) set post_proc_flag
  72  * to VP8_DEBLOCK and deblocking_level to 1.
  73  */
  74
  75 typedef struct vp8_postproc_cfg
  76 {
  77     int post_proc_flag;         /**< the types of post processing to be done, should be combination of "vp8_postproc_level" */
  78     int deblocking_level;       /**< the strength of deblocking, valid range [0, 16] */
  79     int noise_level;            /**< the strength of additive noise, valid range [0, 16] */
  80 } vp8_postproc_cfg_t;
  81
  82 /*!\brief reference frame type
  83  *
  84  * The set of macros define the type of VP8 reference frames
  85  */
  86 typedef enum vpx_ref_frame_type
  87 {
  88     VP8_LAST_FRAME = 1,
  89     VP8_GOLD_FRAME = 2,
  90     VP8_ALTR_FRAME = 4
  91 } vpx_ref_frame_type_t;
  92
  93 /*!\brief reference frame data struct
  94  *
  95  * define the data struct to access vp8 reference frames
  96  */
  97
  98 typedef struct vpx_ref_frame
  99 {
 100     vpx_ref_frame_type_t  frame_type;   /**< which reference frame */
 101     vpx_image_t           img;          /**< reference frame data in image format */
 102 } vpx_ref_frame_t;
 103
 104
 105 /*!\brief vp8 decoder control function parameter type
 106  *
 107  * defines the data type for each of VP8 decoder control function requires
 108  */
 109
 110 VPX_CTRL_USE_TYPE(VP8_SET_REFERENCE,           vpx_ref_frame_t *)
 111 VPX_CTRL_USE_TYPE(VP8_COPY_REFERENCE,          vpx_ref_frame_t *)
 112 VPX_CTRL_USE_TYPE(VP8_SET_POSTPROC,            vp8_postproc_cfg_t *)
 113 VPX_CTRL_USE_TYPE(VP8_SET_DBG_COLOR_REF_FRAME, int)
 114 VPX_CTRL_USE_TYPE(VP8_SET_DBG_COLOR_MB_MODES,  int)
 115 VPX_CTRL_USE_TYPE(VP8_SET_DBG_COLOR_B_MODES,   int)
 116 VPX_CTRL_USE_TYPE(VP8_SET_DBG_DISPLAY_MV,      int)
 117
 118
 119 /*! @} - end defgroup vp8 */
 120
 121 #if !defined(VPX_CODEC_DISABLE_COMPAT) || !VPX_CODEC_DISABLE_COMPAT
 122 /* The following definitions are provided for backward compatibility with
 123  * the VP8 1.0.x SDK. USE IN PRODUCTION CODE IS NOT RECOMMENDED.
 124  */
 125
 126 DECLSPEC_DEPRECATED extern vpx_codec_iface_t vpx_codec_vp8_algo DEPRECATED;
 127 #endif
 128
 129 #include "vpx/vpx_codec_impl_bottom.h"
 130 #endif