зеркало из https://github.com/mozilla/gecko-dev.git
118 строки
3.6 KiB
C
118 строки
3.6 KiB
C
/*
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* Copyright (c) 2010 The WebM project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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/*!\defgroup vp8 VP8
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* \ingroup codecs
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* VP8 is vpx's newest video compression algorithm that uses motion
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* compensated prediction, Discrete Cosine Transform (DCT) coding of the
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* prediction error signal and context dependent entropy coding techniques
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* based on arithmatic principles. It features:
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* - YUV 4:2:0 image format
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* - Macro-block based coding (16x16 luma plus two 8x8 chroma)
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* - 1/4 (1/8) pixel accuracy motion compensated prediction
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* - 4x4 DCT transform
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* - 128 level linear quantizer
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* - In loop deblocking filter
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* - Context-based entropy coding
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*
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* @{
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*/
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/*!\file vp8.h
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* \brief Provides controls common to both the VP8 encoder and decoder.
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*/
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#ifndef VP8_H
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#define VP8_H
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#include "vpx/vpx_codec_impl_top.h"
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/*!\brief Control functions
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*
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* The set of macros define the control functions of VP8 interface
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*/
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enum vp8_dec_control_id
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{
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VP8_SET_REFERENCE = 1, /**< pass in an external frame into decoder to be used as reference frame */
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VP8_COPY_REFERENCE = 2, /**< get a copy of reference frame from the decoder */
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VP8_SET_POSTPROC = 3, /**< set decoder's the post processing settings */
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VP8_COMMON_CTRL_ID_MAX
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};
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/*!\brief post process flags
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*
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* The set of macros define VP8 decoder post processing flags
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*/
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enum vp8_postproc_level
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{
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VP8_NOFILTERING = 0,
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VP8_DEBLOCK = 1,
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VP8_DEMACROBLOCK = 2,
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VP8_ADDNOISE = 4
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};
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/*!\brief post process flags
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*
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* This define a structure that describe the post processing settings. For
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* the best objective measure (using thet PSNR metric) set post_proc_flag
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* to VP8_DEBLOCK and deblocking_level to 1.
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*/
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typedef struct vp8_postproc_cfg
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{
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int post_proc_flag; /**< the types of post processing to be done, should be combination of "vp8_postproc_level" */
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int deblocking_level; /**< the strength of deblocking, valid range [0, 16] */
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int noise_level; /**< the strength of additive noise, valid range [0, 16] */
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} vp8_postproc_cfg_t;
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/*!\brief reference frame type
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*
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* The set of macros define the type of VP8 reference frames
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*/
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typedef enum vpx_ref_frame_type
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{
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VP8_LAST_FRAME = 1,
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VP8_GOLD_FRAME = 2,
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VP8_ALTR_FRAME = 4
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} vpx_ref_frame_type_t;
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/*!\brief reference frame data struct
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*
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* define the data struct to access vp8 reference frames
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*/
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typedef struct vpx_ref_frame
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{
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vpx_ref_frame_type_t frame_type; /**< which reference frame */
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vpx_image_t img; /**< reference frame data in image format */
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} vpx_ref_frame_t;
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/*!\brief vp8 decoder control funciton parameter type
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*
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* defines the data type for each of VP8 decoder control funciton requires
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*/
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VPX_CTRL_USE_TYPE(VP8_SET_REFERENCE, vpx_ref_frame_t *)
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VPX_CTRL_USE_TYPE(VP8_COPY_REFERENCE, vpx_ref_frame_t *)
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VPX_CTRL_USE_TYPE(VP8_SET_POSTPROC, vp8_postproc_cfg_t *)
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/*! @} - end defgroup vp8 */
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#if !defined(VPX_CODEC_DISABLE_COMPAT) || !VPX_CODEC_DISABLE_COMPAT
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/* The following definitions are provided for backward compatibility with
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* the VP8 1.0.x SDK. USE IN PRODUCTION CODE IS NOT RECOMMENDED.
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*/
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DECLSPEC_DEPRECATED extern vpx_codec_iface_t vpx_codec_vp8_algo DEPRECATED;
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#endif
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#include "vpx/vpx_codec_impl_bottom.h"
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#endif
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