ref: abb13c0d8e378e500504249620dd069f2c35046f
dir: /vpx/vp8.h/
/* * Copyright (c) 2010 The WebM 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. */ /*!\defgroup vp8 VP8 * \ingroup codecs * VP8 is a video compression algorithm that uses motion * compensated prediction, Discrete Cosine Transform (DCT) coding of the * prediction error signal and context dependent entropy coding techniques * based on arithmetic principles. It features: * - YUV 4:2:0 image format * - Macro-block based coding (16x16 luma plus two 8x8 chroma) * - 1/4 (1/8) pixel accuracy motion compensated prediction * - 4x4 DCT transform * - 128 level linear quantizer * - In loop deblocking filter * - Context-based entropy coding * * @{ */ /*!\file * \brief Provides controls common to both the VP8 encoder and decoder. */ #ifndef VPX_VPX_VP8_H_ #define VPX_VPX_VP8_H_ #include "./vpx_codec.h" #include "./vpx_image.h" #ifdef __cplusplus extern "C" { #endif /*!\brief Control functions * * The set of macros define the control functions of VP8 interface */ enum vp8_com_control_id { /*!\brief pass in an external frame into decoder to be used as reference frame */ VP8_SET_REFERENCE = 1, VP8_COPY_REFERENCE = 2, /**< get a copy of reference frame from the decoder */ VP8_SET_POSTPROC = 3, /**< set the decoder's post processing settings */ /* TODO(jkoleszar): The encoder incorrectly reuses some of these values (5+) * for its control ids. These should be migrated to something like the * VP8_DECODER_CTRL_ID_START range next time we're ready to break the ABI. */ VP9_GET_REFERENCE = 128, /**< get a pointer to a reference frame */ VP8_COMMON_CTRL_ID_MAX, VP8_DECODER_CTRL_ID_START = 256 }; /*!\brief post process flags * * The set of macros define VP8 decoder post processing flags */ enum vp8_postproc_level { VP8_NOFILTERING = 0, VP8_DEBLOCK = 1 << 0, VP8_DEMACROBLOCK = 1 << 1, VP8_ADDNOISE = 1 << 2, VP8_MFQE = 1 << 3 }; /*!\brief post process flags * * This define a structure that describe the post processing settings. For * the best objective measure (using the PSNR metric) set post_proc_flag * to VP8_DEBLOCK and deblocking_level to 1. */ typedef struct vp8_postproc_cfg { /*!\brief the types of post processing to be done, should be combination of * "vp8_postproc_level" */ int post_proc_flag; int deblocking_level; /**< the strength of deblocking, valid range [0, 16] */ int noise_level; /**< the strength of additive noise, valid range [0, 16] */ } vp8_postproc_cfg_t; /*!\brief reference frame type * * The set of macros define the type of VP8 reference frames */ typedef enum vpx_ref_frame_type { VP8_LAST_FRAME = 1, VP8_GOLD_FRAME = 2, VP8_ALTR_FRAME = 4 } vpx_ref_frame_type_t; /*!\brief reference frame data struct * * Define the data struct to access vp8 reference frames. */ typedef struct vpx_ref_frame { vpx_ref_frame_type_t frame_type; /**< which reference frame */ vpx_image_t img; /**< reference frame data in image format */ } vpx_ref_frame_t; /*!\brief VP9 specific reference frame data struct * * Define the data struct to access vp9 reference frames. */ typedef struct vp9_ref_frame { int idx; /**< frame index to get (input) */ vpx_image_t img; /**< img structure to populate (output) */ } vp9_ref_frame_t; /*!\cond */ /*!\brief vp8 decoder control function parameter type * * defines the data type for each of VP8 decoder control function requires */ VPX_CTRL_USE_TYPE(VP8_SET_REFERENCE, vpx_ref_frame_t *) #define VPX_CTRL_VP8_SET_REFERENCE VPX_CTRL_USE_TYPE(VP8_COPY_REFERENCE, vpx_ref_frame_t *) #define VPX_CTRL_VP8_COPY_REFERENCE VPX_CTRL_USE_TYPE(VP8_SET_POSTPROC, vp8_postproc_cfg_t *) #define VPX_CTRL_VP8_SET_POSTPROC VPX_CTRL_USE_TYPE(VP9_GET_REFERENCE, vp9_ref_frame_t *) #define VPX_CTRL_VP9_GET_REFERENCE /*!\endcond */ /*! @} - end defgroup vp8 */ #ifdef __cplusplus } // extern "C" #endif #endif // VPX_VPX_VP8_H_