553 lines
19 KiB
C
553 lines
19 KiB
C
/*
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* Copyright (c) 2016, Alliance for Open Media. All rights reserved
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*
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* This source code is subject to the terms of the BSD 2 Clause License and
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* the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
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* was not distributed with this source code in the LICENSE file, you can
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* obtain it at www.aomedia.org/license/software. If the Alliance for Open
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* Media Patent License 1.0 was not distributed with this source code in the
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* PATENTS file, you can obtain it at www.aomedia.org/license/patent.
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*/
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///////////////////////////////////////////////////////////////////////////////
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// Internal implementation details
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///////////////////////////////////////////////////////////////////////////////
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//
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// There are two levels of interfaces used to access the AOM codec: the
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// the aom_codec_iface and the aom_codec_ctx.
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//
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// 1. aom_codec_iface_t
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// (Related files: aom/aom_codec.h, aom/src/aom_codec.c,
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// aom/internal/aom_codec_internal.h, av1/av1_cx_iface.c,
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// av1/av1_dx_iface.c)
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//
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// Used to initialize the codec context, which contains the configuration for
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// for modifying the encoder/decoder during run-time. See the other
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// documentation in this header file for more details. For the most part,
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// users will call helper functions, such as aom_codec_iface_name,
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// aom_codec_get_caps, etc., to interact with it.
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//
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// The main purpose of the aom_codec_iface_t is to provide a way to generate
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// a default codec config, find out what capabilities the implementation has,
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// and create an aom_codec_ctx_t (which is actually used to interact with the
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// codec).
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//
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// Note that the implementations for the AV1 algorithm are located in
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// av1/av1_cx_iface.c and av1/av1_dx_iface.c
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//
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//
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// 2. aom_codec_ctx_t
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// (Related files: aom/aom_codec.h, av1/av1_cx_iface.c, av1/av1_dx_iface.c,
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// aom/aomcx.h, aom/aomdx.h, aom/src/aom_encoder.c, aom/src/aom_decoder.c)
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//
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// The actual interface between user code and the codec. It stores the name
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// of the codec, a pointer back to the aom_codec_iface_t that initialized it,
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// initialization flags, a config for either encoder or the decoder, and a
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// pointer to internal data.
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//
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// The codec is configured / queried through calls to aom_codec_control,
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// which takes a control ID (listed in aomcx.h and aomdx.h) and a parameter.
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// In the case of "getter" control IDs, the parameter is modified to have
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// the requested value; in the case of "setter" control IDs, the codec's
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// configuration is changed based on the parameter. Note that a aom_codec_err_t
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// is returned, which indicates if the operation was successful or not.
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//
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// Note that for the encoder, the aom_codec_alg_priv_t points to the
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// the aom_codec_alg_priv structure in av1/av1_cx_iface.c, and for the decoder,
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// the struct in av1/av1_dx_iface.c. Variables such as AV1_COMP cpi are stored
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// here and also used in the core algorithm.
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//
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// At the end, aom_codec_destroy should be called for each initialized
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// aom_codec_ctx_t.
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/*!\defgroup codec Common Algorithm Interface
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* This abstraction allows applications to easily support multiple video
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* formats with minimal code duplication. This section describes the interface
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* common to all codecs (both encoders and decoders).
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* @{
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*/
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/*!\file
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* \brief Describes the codec algorithm interface to applications.
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*
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* This file describes the interface between an application and a
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* video codec algorithm.
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*
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* An application instantiates a specific codec instance by using
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* aom_codec_dec_init() or aom_codec_enc_init() and a pointer to the
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* algorithm's interface structure:
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* <pre>
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* my_app.c:
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* extern aom_codec_iface_t my_codec;
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* {
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* aom_codec_ctx_t algo;
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* int threads = 4;
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* aom_codec_dec_cfg_t cfg = { threads, 0, 0, 1 };
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* res = aom_codec_dec_init(&algo, &my_codec, &cfg, 0);
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* }
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* </pre>
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*
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* Once initialized, the instance is managed using other functions from
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* the aom_codec_* family.
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*/
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#ifndef AOM_AOM_AOM_CODEC_H_
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#define AOM_AOM_AOM_CODEC_H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include "aom/aom_image.h"
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#include "aom/aom_integer.h"
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/*!\brief Decorator indicating a function is deprecated */
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#ifndef AOM_DEPRECATED
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#if defined(__GNUC__) && __GNUC__
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#define AOM_DEPRECATED __attribute__((deprecated))
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#elif defined(_MSC_VER)
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#define AOM_DEPRECATED
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#else
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#define AOM_DEPRECATED
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#endif
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#endif /* AOM_DEPRECATED */
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#ifndef AOM_DECLSPEC_DEPRECATED
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#if defined(__GNUC__) && __GNUC__
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#define AOM_DECLSPEC_DEPRECATED /**< \copydoc #AOM_DEPRECATED */
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#elif defined(_MSC_VER)
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/*!\brief \copydoc #AOM_DEPRECATED */
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#define AOM_DECLSPEC_DEPRECATED __declspec(deprecated)
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#else
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#define AOM_DECLSPEC_DEPRECATED /**< \copydoc #AOM_DEPRECATED */
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#endif
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#endif /* AOM_DECLSPEC_DEPRECATED */
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/*!\brief Decorator indicating a function is potentially unused */
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#ifdef AOM_UNUSED
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#elif defined(__GNUC__) || defined(__clang__)
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#define AOM_UNUSED __attribute__((unused))
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#else
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#define AOM_UNUSED
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#endif
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/*!\brief Decorator indicating that given struct/union/enum is packed */
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#ifndef ATTRIBUTE_PACKED
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#if defined(__GNUC__) && __GNUC__
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#define ATTRIBUTE_PACKED __attribute__((packed))
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#elif defined(_MSC_VER)
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#define ATTRIBUTE_PACKED
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#else
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#define ATTRIBUTE_PACKED
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#endif
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#endif /* ATTRIBUTE_PACKED */
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/*!\brief Current ABI version number
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*
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* \internal
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* If this file is altered in any way that changes the ABI, this value
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* must be bumped. Examples include, but are not limited to, changing
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* types, removing or reassigning enums, adding/removing/rearranging
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* fields to structures
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*/
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#define AOM_CODEC_ABI_VERSION (5 + AOM_IMAGE_ABI_VERSION) /**<\hideinitializer*/
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/*!\brief Algorithm return codes */
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typedef enum {
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/*!\brief Operation completed without error */
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AOM_CODEC_OK,
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/*!\brief Unspecified error */
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AOM_CODEC_ERROR,
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/*!\brief Memory operation failed */
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AOM_CODEC_MEM_ERROR,
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/*!\brief ABI version mismatch */
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AOM_CODEC_ABI_MISMATCH,
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/*!\brief Algorithm does not have required capability */
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AOM_CODEC_INCAPABLE,
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/*!\brief The given bitstream is not supported.
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*
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* The bitstream was unable to be parsed at the highest level. The decoder
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* is unable to proceed. This error \ref SHOULD be treated as fatal to the
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* stream. */
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AOM_CODEC_UNSUP_BITSTREAM,
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/*!\brief Encoded bitstream uses an unsupported feature
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*
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* The decoder does not implement a feature required by the encoder. This
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* return code should only be used for features that prevent future
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* pictures from being properly decoded. This error \ref MAY be treated as
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* fatal to the stream or \ref MAY be treated as fatal to the current GOP.
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*/
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AOM_CODEC_UNSUP_FEATURE,
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/*!\brief The coded data for this stream is corrupt or incomplete
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*
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* There was a problem decoding the current frame. This return code
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* should only be used for failures that prevent future pictures from
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* being properly decoded. This error \ref MAY be treated as fatal to the
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* stream or \ref MAY be treated as fatal to the current GOP. If decoding
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* is continued for the current GOP, artifacts may be present.
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*/
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AOM_CODEC_CORRUPT_FRAME,
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/*!\brief An application-supplied parameter is not valid.
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*
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*/
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AOM_CODEC_INVALID_PARAM,
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/*!\brief An iterator reached the end of list.
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*
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*/
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AOM_CODEC_LIST_END
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} aom_codec_err_t;
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/*! \brief Codec capabilities bitfield
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*
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* Each codec advertises the capabilities it supports as part of its
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* ::aom_codec_iface_t interface structure. Capabilities are extra interfaces
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* or functionality, and are not required to be supported.
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*
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* The available flags are specified by AOM_CODEC_CAP_* defines.
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*/
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typedef long aom_codec_caps_t;
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#define AOM_CODEC_CAP_DECODER 0x1 /**< Is a decoder */
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#define AOM_CODEC_CAP_ENCODER 0x2 /**< Is an encoder */
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/*! \brief Initialization-time Feature Enabling
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*
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* Certain codec features must be known at initialization time, to allow for
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* proper memory allocation.
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*
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* The available flags are specified by AOM_CODEC_USE_* defines.
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*/
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typedef long aom_codec_flags_t;
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/*!\brief Time Stamp Type
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*
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* An integer, which when multiplied by the stream's time base, provides
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* the absolute time of a sample.
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*/
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typedef int64_t aom_codec_pts_t;
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/*!\brief Codec interface structure.
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*
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* Contains function pointers and other data private to the codec
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* implementation. This structure is opaque to the application. Common
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* functions used with this structure:
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* - aom_codec_iface_name(aom_codec_iface_t *iface): get the
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* name of the codec
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* - aom_codec_get_caps(aom_codec_iface_t *iface): returns
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* the capabilities of the codec
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* - aom_codec_enc_config_default: generate the default config for
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* initializing the encoder (see documention in aom_encoder.h)
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* - aom_codec_dec_init, aom_codec_enc_init: initialize the codec context
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* structure (see documentation on aom_codec_ctx).
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*
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* To get access to the AV1 encoder and decoder, use aom_codec_av1_cx() and
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* aom_codec_av1_dx().
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*/
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typedef const struct aom_codec_iface aom_codec_iface_t;
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/*!\brief Codec private data structure.
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*
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* Contains data private to the codec implementation. This structure is opaque
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* to the application.
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*/
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typedef struct aom_codec_priv aom_codec_priv_t;
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/*!\brief Compressed Frame Flags
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*
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* This type represents a bitfield containing information about a compressed
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* frame that may be useful to an application. The most significant 16 bits
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* can be used by an algorithm to provide additional detail, for example to
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* support frame types that are codec specific (MPEG-1 D-frames for example)
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*/
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typedef uint32_t aom_codec_frame_flags_t;
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#define AOM_FRAME_IS_KEY 0x1 /**< frame is the start of a GOP */
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/*!\brief frame can be dropped without affecting the stream (no future frame
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* depends on this one) */
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#define AOM_FRAME_IS_DROPPABLE 0x2
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/*!\brief this is an INTRA_ONLY frame */
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#define AOM_FRAME_IS_INTRAONLY 0x10
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/*!\brief this is an S-frame */
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#define AOM_FRAME_IS_SWITCH 0x20
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/*!\brief this is an error-resilient frame */
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#define AOM_FRAME_IS_ERROR_RESILIENT 0x40
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/*!\brief this is a key-frame dependent recovery-point frame */
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#define AOM_FRAME_IS_DELAYED_RANDOM_ACCESS_POINT 0x80
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/*!\brief Iterator
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*
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* Opaque storage used for iterating over lists.
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*/
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typedef const void *aom_codec_iter_t;
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/*!\brief Codec context structure
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*
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* All codecs \ref MUST support this context structure fully. In general,
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* this data should be considered private to the codec algorithm, and
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* not be manipulated or examined by the calling application. Applications
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* may reference the 'name' member to get a printable description of the
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* algorithm.
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*/
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typedef struct aom_codec_ctx {
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const char *name; /**< Printable interface name */
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aom_codec_iface_t *iface; /**< Interface pointers */
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aom_codec_err_t err; /**< Last returned error */
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const char *err_detail; /**< Detailed info, if available */
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aom_codec_flags_t init_flags; /**< Flags passed at init time */
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union {
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/**< Decoder Configuration Pointer */
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const struct aom_codec_dec_cfg *dec;
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/**< Encoder Configuration Pointer */
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const struct aom_codec_enc_cfg *enc;
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const void *raw;
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} config; /**< Configuration pointer aliasing union */
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aom_codec_priv_t *priv; /**< Algorithm private storage */
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} aom_codec_ctx_t;
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/*!\brief Bit depth for codec
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* *
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* This enumeration determines the bit depth of the codec.
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*/
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typedef enum aom_bit_depth {
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AOM_BITS_8 = 8, /**< 8 bits */
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AOM_BITS_10 = 10, /**< 10 bits */
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AOM_BITS_12 = 12, /**< 12 bits */
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} aom_bit_depth_t;
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/*!\brief Superblock size selection.
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*
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* Defines the superblock size used for encoding. The superblock size can
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* either be fixed at 64x64 or 128x128 pixels, or it can be dynamically
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* selected by the encoder for each frame.
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*/
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typedef enum aom_superblock_size {
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AOM_SUPERBLOCK_SIZE_64X64, /**< Always use 64x64 superblocks. */
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AOM_SUPERBLOCK_SIZE_128X128, /**< Always use 128x128 superblocks. */
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AOM_SUPERBLOCK_SIZE_DYNAMIC /**< Select superblock size dynamically. */
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} aom_superblock_size_t;
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/*
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* Library Version Number Interface
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*
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* For example, see the following sample return values:
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* aom_codec_version() (1<<16 | 2<<8 | 3)
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* aom_codec_version_str() "v1.2.3-rc1-16-gec6a1ba"
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* aom_codec_version_extra_str() "rc1-16-gec6a1ba"
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*/
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/*!\brief Return the version information (as an integer)
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*
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* Returns a packed encoding of the library version number. This will only
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* include the major.minor.patch component of the version number. Note that this
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* encoded value should be accessed through the macros provided, as the encoding
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* may change in the future.
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*
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*/
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int aom_codec_version(void);
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/*!\brief Return the major version number */
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#define aom_codec_version_major() ((aom_codec_version() >> 16) & 0xff)
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/*!\brief Return the minor version number */
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#define aom_codec_version_minor() ((aom_codec_version() >> 8) & 0xff)
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/*!\brief Return the patch version number */
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#define aom_codec_version_patch() ((aom_codec_version() >> 0) & 0xff)
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/*!\brief Return the version information (as a string)
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*
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* Returns a printable string containing the full library version number. This
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* may contain additional text following the three digit version number, as to
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* indicate release candidates, prerelease versions, etc.
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*
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*/
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const char *aom_codec_version_str(void);
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/*!\brief Return the version information (as a string)
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*
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* Returns a printable "extra string". This is the component of the string
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* returned by aom_codec_version_str() following the three digit version number.
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*
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*/
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const char *aom_codec_version_extra_str(void);
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/*!\brief Return the build configuration
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*
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* Returns a printable string containing an encoded version of the build
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* configuration. This may be useful to aom support.
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*
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*/
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const char *aom_codec_build_config(void);
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/*!\brief Return the name for a given interface
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*
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* Returns a human readable string for name of the given codec interface.
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*
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* \param[in] iface Interface pointer
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*
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*/
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const char *aom_codec_iface_name(aom_codec_iface_t *iface);
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/*!\brief Convert error number to printable string
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*
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* Returns a human readable string for the last error returned by the
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* algorithm. The returned error will be one line and will not contain
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* any newline characters.
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*
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*
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* \param[in] err Error number.
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*
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*/
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const char *aom_codec_err_to_string(aom_codec_err_t err);
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/*!\brief Retrieve error synopsis for codec context
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*
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* Returns a human readable string for the last error returned by the
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* algorithm. The returned error will be one line and will not contain
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* any newline characters.
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*
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*
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* \param[in] ctx Pointer to this instance's context.
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*
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*/
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const char *aom_codec_error(aom_codec_ctx_t *ctx);
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/*!\brief Retrieve detailed error information for codec context
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*
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* Returns a human readable string providing detailed information about
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* the last error.
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*
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* \param[in] ctx Pointer to this instance's context.
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*
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* \retval NULL
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* No detailed information is available.
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*/
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const char *aom_codec_error_detail(aom_codec_ctx_t *ctx);
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/* REQUIRED FUNCTIONS
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*
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* The following functions are required to be implemented for all codecs.
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* They represent the base case functionality expected of all codecs.
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*/
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/*!\brief Destroy a codec instance
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*
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* Destroys a codec context, freeing any associated memory buffers.
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*
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* \param[in] ctx Pointer to this instance's context
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*
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* \retval #AOM_CODEC_OK
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* The codec algorithm initialized.
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* \retval #AOM_CODEC_MEM_ERROR
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* Memory allocation failed.
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*/
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aom_codec_err_t aom_codec_destroy(aom_codec_ctx_t *ctx);
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/*!\brief Get the capabilities of an algorithm.
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*
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* Retrieves the capabilities bitfield from the algorithm's interface.
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*
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* \param[in] iface Pointer to the algorithm interface
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*
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*/
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aom_codec_caps_t aom_codec_get_caps(aom_codec_iface_t *iface);
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/*!\name Codec Control
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*
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* The aom_codec_control function exchanges algorithm specific data with the
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* codec instance. Additionally, the macro AOM_CODEC_CONTROL_TYPECHECKED is
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* provided, which will type-check the parameter against the control ID before
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* calling aom_codec_control - note that this macro requires the control ID
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* to be directly encoded in it, e.g.,
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* AOM_CODEC_CONTROL_TYPECHECKED(&ctx, AOME_SET_CPUUSED, 8).
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*
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* The codec control IDs can be found in aom.h, aomcx.h, and aomdx.h
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* (defined as aom_com_control_id, aome_enc_control_id, and aom_dec_control_id).
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* @{
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*/
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/*!\brief Algorithm Control
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*
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* aom_codec_control takes a context, a control ID, and a third parameter
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* (with varying type). If the context is non-null and an error occurs,
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* ctx->err will be set to the same value as the return value.
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|
*
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* \param[in] ctx Pointer to this instance's context
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|
* \param[in] ctrl_id Algorithm specific control identifier
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*
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* \retval #AOM_CODEC_OK
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* The control request was processed.
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* \retval #AOM_CODEC_ERROR
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* The control request was not processed.
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* \retval #AOM_CODEC_INVALID_PARAM
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|
* The data was not valid.
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*/
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aom_codec_err_t aom_codec_control(aom_codec_ctx_t *ctx, int ctrl_id, ...);
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|
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/*!\brief aom_codec_control wrapper macro (adds type-checking, less flexible)
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|
*
|
|
* This macro allows for type safe conversions across the variadic parameter
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|
* to aom_codec_control(). However, it requires the explicit control ID
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|
* be passed in (it cannot be passed in via a variable) -- otherwise a compiler
|
|
* error will occur. After the type checking, it calls aom_codec_control.
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|
*/
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|
#define AOM_CODEC_CONTROL_TYPECHECKED(ctx, id, data) \
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|
aom_codec_control_typechecked_##id(ctx, id, data) /**<\hideinitializer*/
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|
|
|
/*!\brief Creates typechecking mechanisms for aom_codec_control
|
|
*
|
|
* It defines a static function with the correctly typed arguments as a wrapper
|
|
* to the type-unsafe aom_codec_control function. It also creates a typedef
|
|
* for each type.
|
|
*/
|
|
#define AOM_CTRL_USE_TYPE(id, typ) \
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|
static aom_codec_err_t aom_codec_control_typechecked_##id( \
|
|
aom_codec_ctx_t *, int, typ) AOM_UNUSED; \
|
|
static aom_codec_err_t aom_codec_control_typechecked_##id( \
|
|
aom_codec_ctx_t *ctx, int ctrl, typ data) { \
|
|
return aom_codec_control(ctx, ctrl, data); \
|
|
} /**<\hideinitializer*/ \
|
|
typedef typ aom_codec_control_type_##id;
|
|
/*!@} end Codec Control group */
|
|
|
|
/*!\brief OBU types. */
|
|
typedef enum ATTRIBUTE_PACKED {
|
|
OBU_SEQUENCE_HEADER = 1,
|
|
OBU_TEMPORAL_DELIMITER = 2,
|
|
OBU_FRAME_HEADER = 3,
|
|
OBU_TILE_GROUP = 4,
|
|
OBU_METADATA = 5,
|
|
OBU_FRAME = 6,
|
|
OBU_REDUNDANT_FRAME_HEADER = 7,
|
|
OBU_TILE_LIST = 8,
|
|
OBU_PADDING = 15,
|
|
} OBU_TYPE;
|
|
|
|
/*!\brief OBU metadata types. */
|
|
typedef enum {
|
|
OBU_METADATA_TYPE_AOM_RESERVED_0 = 0,
|
|
OBU_METADATA_TYPE_HDR_CLL = 1,
|
|
OBU_METADATA_TYPE_HDR_MDCV = 2,
|
|
OBU_METADATA_TYPE_SCALABILITY = 3,
|
|
OBU_METADATA_TYPE_ITUT_T35 = 4,
|
|
OBU_METADATA_TYPE_TIMECODE = 5,
|
|
} OBU_METADATA_TYPE;
|
|
|
|
/*!\brief Returns string representation of OBU_TYPE.
|
|
*
|
|
* \param[in] type The OBU_TYPE to convert to string.
|
|
*/
|
|
const char *aom_obu_type_to_string(OBU_TYPE type);
|
|
|
|
/*!@} - end defgroup codec*/
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
#endif // AOM_AOM_AOM_CODEC_H_
|