2 * Copyright (c) 2010 The WebM project authors. All Rights Reserved.
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.
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
22 * - 128 level linear quantizer
23 * - In loop deblocking filter
24 * - Context-based entropy coding
29 * \brief Provides controls common to both the VP8 encoder and decoder.
38 /*!\brief Control functions
40 * The set of macros define the control functions of VP8 interface
42 enum vp8_com_control_id {
43 VP8_SET_REFERENCE = 1, /**< pass in an external frame into decoder to be used as reference frame */
44 VP8_COPY_REFERENCE = 2, /**< get a copy of reference frame from the decoder */
45 VP8_SET_POSTPROC = 3, /**< set the decoder's post processing settings */
46 VP8_SET_DBG_COLOR_REF_FRAME = 4, /**< set the reference frames to color for each macroblock */
47 VP8_SET_DBG_COLOR_MB_MODES = 5, /**< set which macro block modes to color */
48 VP8_SET_DBG_COLOR_B_MODES = 6, /**< set which blocks modes to color */
49 VP8_SET_DBG_DISPLAY_MV = 7, /**< set which motion vector modes to draw */
51 /* TODO(jkoleszar): The encoder incorrectly reuses some of these values (5+)
52 * for its control ids. These should be migrated to something like the
53 * VP8_DECODER_CTRL_ID_START range next time we're ready to break the ABI.
55 VP9_GET_REFERENCE = 128, /**< get a pointer to a reference frame */
56 VP8_COMMON_CTRL_ID_MAX,
57 VP8_DECODER_CTRL_ID_START = 256
60 /*!\brief post process flags
62 * The set of macros define VP8 decoder post processing flags
64 enum vp8_postproc_level {
67 VP8_DEMACROBLOCK = 1 << 1,
68 VP8_ADDNOISE = 1 << 2,
69 VP8_DEBUG_TXT_FRAME_INFO = 1 << 3, /**< print frame information */
70 VP8_DEBUG_TXT_MBLK_MODES = 1 << 4, /**< print macro block modes over each macro block */
71 VP8_DEBUG_TXT_DC_DIFF = 1 << 5, /**< print dc diff for each macro block */
72 VP8_DEBUG_TXT_RATE_INFO = 1 << 6, /**< print video rate info (encoder only) */
76 /*!\brief post process flags
78 * This define a structure that describe the post processing settings. For
79 * the best objective measure (using the PSNR metric) set post_proc_flag
80 * to VP8_DEBLOCK and deblocking_level to 1.
83 typedef struct vp8_postproc_cfg {
84 int post_proc_flag; /**< the types of post processing to be done, should be combination of "vp8_postproc_level" */
85 int deblocking_level; /**< the strength of deblocking, valid range [0, 16] */
86 int noise_level; /**< the strength of additive noise, valid range [0, 16] */
89 /*!\brief reference frame type
91 * The set of macros define the type of VP8 reference frames
93 typedef enum vpx_ref_frame_type {
97 } vpx_ref_frame_type_t;
99 /*!\brief reference frame data struct
101 * define the data struct to access vp8 reference frames
104 typedef struct vpx_ref_frame {
105 vpx_ref_frame_type_t frame_type; /**< which reference frame */
106 vpx_image_t img; /**< reference frame data in image format */
109 typedef struct vp9_ref_frame {
110 int idx; /**< frame index to get (input) */
111 vpx_image_t img; /**< img structure to populate (output) */
114 /*!\brief vp8 decoder control function parameter type
116 * defines the data type for each of VP8 decoder control function requires
119 VPX_CTRL_USE_TYPE(VP8_SET_REFERENCE, vpx_ref_frame_t *)
120 VPX_CTRL_USE_TYPE(VP8_COPY_REFERENCE, vpx_ref_frame_t *)
121 VPX_CTRL_USE_TYPE(VP8_SET_POSTPROC, vp8_postproc_cfg_t *)
122 VPX_CTRL_USE_TYPE(VP8_SET_DBG_COLOR_REF_FRAME, int)
123 VPX_CTRL_USE_TYPE(VP8_SET_DBG_COLOR_MB_MODES, int)
124 VPX_CTRL_USE_TYPE(VP8_SET_DBG_COLOR_B_MODES, int)
125 VPX_CTRL_USE_TYPE(VP8_SET_DBG_DISPLAY_MV, int)
126 VPX_CTRL_USE_TYPE(VP9_GET_REFERENCE, vp9_ref_frame_t *)
129 /*! @} - end defgroup vp8 */