139 строки
5.0 KiB
C
139 строки
5.0 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 arithmetic 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
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* \brief Provides controls common to both the VP8 encoder and decoder.
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*/
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#ifndef VPX_VP8_H_
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#define VPX_VP8_H_
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#include "./vpx_codec.h"
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#include "./vpx_image.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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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_com_control_id {
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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 the decoder's post processing settings */
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VP8_SET_DBG_COLOR_REF_FRAME = 4, /**< set the reference frames to color for each macroblock */
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VP8_SET_DBG_COLOR_MB_MODES = 5, /**< set which macro block modes to color */
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VP8_SET_DBG_COLOR_B_MODES = 6, /**< set which blocks modes to color */
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VP8_SET_DBG_DISPLAY_MV = 7, /**< set which motion vector modes to draw */
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/* TODO(jkoleszar): The encoder incorrectly reuses some of these values (5+)
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* for its control ids. These should be migrated to something like the
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* VP8_DECODER_CTRL_ID_START range next time we're ready to break the ABI.
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*/
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VP9_GET_REFERENCE = 128, /**< get a pointer to a reference frame */
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VP8_COMMON_CTRL_ID_MAX,
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VP8_DECODER_CTRL_ID_START = 256
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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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VP8_NOFILTERING = 0,
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VP8_DEBLOCK = 1 << 0,
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VP8_DEMACROBLOCK = 1 << 1,
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VP8_ADDNOISE = 1 << 2,
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VP8_DEBUG_TXT_FRAME_INFO = 1 << 3, /**< print frame information */
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VP8_DEBUG_TXT_MBLK_MODES = 1 << 4, /**< print macro block modes over each macro block */
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VP8_DEBUG_TXT_DC_DIFF = 1 << 5, /**< print dc diff for each macro block */
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VP8_DEBUG_TXT_RATE_INFO = 1 << 6, /**< print video rate info (encoder only) */
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VP8_MFQE = 1 << 10
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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 the 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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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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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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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 VP9 specific reference frame data struct
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*
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* Define the data struct to access vp9 reference frames.
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*/
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typedef struct vp9_ref_frame {
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int idx; /**< frame index to get (input) */
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vpx_image_t img; /**< img structure to populate (output) */
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} vp9_ref_frame_t;
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/*!\brief vp8 decoder control function parameter type
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*
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* defines the data type for each of VP8 decoder control function 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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VPX_CTRL_USE_TYPE(VP8_SET_DBG_COLOR_REF_FRAME, int)
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VPX_CTRL_USE_TYPE(VP8_SET_DBG_COLOR_MB_MODES, int)
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VPX_CTRL_USE_TYPE(VP8_SET_DBG_COLOR_B_MODES, int)
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VPX_CTRL_USE_TYPE(VP8_SET_DBG_DISPLAY_MV, int)
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VPX_CTRL_USE_TYPE(VP9_GET_REFERENCE, vp9_ref_frame_t *)
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/*! @} - end defgroup vp8 */
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#ifdef __cplusplus
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} // extern "C"
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#endif
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#endif // VPX_VP8_H_
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