555 строки
20 KiB
C
555 строки
20 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 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 vpx_codec.h
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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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* vpx_codec_init() and a pointer to the algorithm's interface structure:
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* <pre>
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* my_app.c:
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* extern vpx_codec_iface_t my_codec;
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* {
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* vpx_codec_ctx_t algo;
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* res = vpx_codec_init(&algo, &my_codec);
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* }
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* </pre>
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*
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* Once initialized, the instance is manged using other functions from
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* the vpx_codec_* family.
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*/
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifndef VPX_CODEC_H
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#define VPX_CODEC_H
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#include "vpx_integer.h"
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#include "vpx_image.h"
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/*!\brief Decorator indicating a function is deprecated */
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#ifndef DEPRECATED
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#if defined(__GNUC__) && __GNUC__
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#define DEPRECATED __attribute__ ((deprecated))
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#define DECLSPEC_DEPRECATED /**< \copydoc #DEPRECATED */
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#elif defined(_MSC_VER)
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#define DEPRECATED
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#define DECLSPEC_DEPRECATED __declspec(deprecated) /**< \copydoc #DEPRECATED */
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#else
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#define DEPRECATED
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#define DECLSPEC_DEPRECATED /**< \copydoc #DEPRECATED */
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#endif
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#endif
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/*!\brief Decorator indicating a function is potentially unused */
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#ifdef UNUSED
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#elif __GNUC__
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#define UNUSED __attribute__ ((unused))
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#else
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#define UNUSED
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#endif
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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 VPX_CODEC_ABI_VERSION (2 + VPX_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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VPX_CODEC_OK,
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/*!\brief Unspecified error */
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VPX_CODEC_ERROR,
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/*!\brief Memory operation failed */
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VPX_CODEC_MEM_ERROR,
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/*!\brief ABI version mismatch */
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VPX_CODEC_ABI_MISMATCH,
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/*!\brief Algorithm does not have required capability */
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VPX_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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VPX_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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VPX_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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VPX_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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VPX_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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VPX_CODEC_LIST_END
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}
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vpx_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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* ::vpx_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 VPX_CODEC_CAP_* defines.
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*/
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typedef long vpx_codec_caps_t;
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#define VPX_CODEC_CAP_DECODER 0x1 /**< Is a decoder */
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#define VPX_CODEC_CAP_ENCODER 0x2 /**< Is an encoder */
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#define VPX_CODEC_CAP_XMA 0x4 /**< Supports e_xternal Memory Allocation */
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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 VPX_CODEC_USE_* defines.
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*/
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typedef long vpx_codec_flags_t;
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#define VPX_CODEC_USE_XMA 0x00000001 /**< Use e_xternal Memory Allocation mode */
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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.
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*/
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typedef const struct vpx_codec_iface vpx_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 vpx_codec_priv vpx_codec_priv_t;
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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 *vpx_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 vpx_codec_ctx
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{
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const char *name; /**< Printable interface name */
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vpx_codec_iface_t *iface; /**< Interface pointers */
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vpx_codec_err_t err; /**< Last returned error */
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const char *err_detail; /**< Detailed info, if available */
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vpx_codec_flags_t init_flags; /**< Flags passed at init time */
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union
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{
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struct vpx_codec_dec_cfg *dec; /**< Decoder Configuration Pointer */
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struct vpx_codec_enc_cfg *enc; /**< Encoder Configuration Pointer */
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void *raw;
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} config; /**< Configuration pointer aliasing union */
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vpx_codec_priv_t *priv; /**< Algorithm private storage */
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} vpx_codec_ctx_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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* vpx_codec_version() (1<<16 | 2<<8 | 3)
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* vpx_codec_version_str() "v1.2.3-rc1-16-gec6a1ba"
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* vpx_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 include
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* the major.minor.patch component of the version number. Note that this encoded
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* value should be accessed through the macros provided, as the encoding may change
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* in the future.
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*
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*/
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int vpx_codec_version(void);
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#define VPX_VERSION_MAJOR(v) ((v>>16)&0xff) /**< extract major from packed version */
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#define VPX_VERSION_MINOR(v) ((v>>8)&0xff) /**< extract minor from packed version */
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#define VPX_VERSION_PATCH(v) ((v>>0)&0xff) /**< extract patch from packed version */
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/*!\brief Return the version major number */
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#define vpx_codec_version_major() ((vpx_codec_version()>>16)&0xff)
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/*!\brief Return the version minr number */
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#define vpx_codec_version_minor() ((vpx_codec_version()>>8)&0xff)
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/*!\brief Return the version patch number */
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#define vpx_codec_version_patch() ((vpx_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 may
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* contain additional text following the three digit version number, as to indicate
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* release candidates, prerelease versions, etc.
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*
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*/
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const char *vpx_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 returned
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* by vpx_codec_version_str() following the three digit version number.
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*
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*/
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const char *vpx_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 vpx support.
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*
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*/
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const char *vpx_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 *vpx_codec_iface_name(vpx_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 *vpx_codec_err_to_string(vpx_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 *vpx_codec_error(vpx_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 *vpx_codec_error_detail(vpx_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 #VPX_CODEC_OK
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* The codec algorithm initialized.
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* \retval #VPX_CODEC_MEM_ERROR
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* Memory allocation failed.
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*/
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vpx_codec_err_t vpx_codec_destroy(vpx_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 capabliities bitfield from the algorithm's interface.
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*
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* \param[in] iface Pointer to the alogrithm interface
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*
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*/
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vpx_codec_caps_t vpx_codec_get_caps(vpx_codec_iface_t *iface);
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/*!\brief Control algorithm
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*
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* This function is used to exchange algorithm specific data with the codec
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* instance. This can be used to implement features specific to a particular
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* algorithm.
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*
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* This wrapper function dispatches the request to the helper function
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* associated with the given ctrl_id. It tries to call this function
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* transparantly, but will return #VPX_CODEC_ERROR if the request could not
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* be dispatched.
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*
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* Note that this function should not be used directly. Call the
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* #vpx_codec_control wrapper macro instead.
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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 #VPX_CODEC_OK
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* The control request was processed.
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* \retval #VPX_CODEC_ERROR
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* The control request was not processed.
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* \retval #VPX_CODEC_INVALID_PARAM
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* The data was not valid.
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*/
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vpx_codec_err_t vpx_codec_control_(vpx_codec_ctx_t *ctx,
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int ctrl_id,
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...);
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#if defined(VPX_DISABLE_CTRL_TYPECHECKS) && VPX_DISABLE_CTRL_TYPECHECKS
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# define vpx_codec_control(ctx,id,data) vpx_codec_control_(ctx,id,data)
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# define VPX_CTRL_USE_TYPE(id, typ)
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# define VPX_CTRL_USE_TYPE_DEPRECATED(id, typ)
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# define VPX_CTRL_VOID(id, typ)
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#else
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/*!\brief vpx_codec_control wrapper macro
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*
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* This macro allows for type safe conversions across the variadic parameter
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* to vpx_codec_control_().
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*
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* \internal
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* It works by dispatching the call to the control function through a wrapper
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* function named with the id parameter.
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*/
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# define vpx_codec_control(ctx,id,data) vpx_codec_control_##id(ctx,id,data)\
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/**<\hideinitializer*/
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/*!\brief vpx_codec_control type definition macro
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*
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* This macro allows for type safe conversions across the variadic parameter
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* to vpx_codec_control_(). It defines the type of the argument for a given
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* control identifier.
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*
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* \internal
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* It defines a static function with
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* the correctly typed arguments as a wrapper to the type-unsafe internal
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* function.
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*/
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# define VPX_CTRL_USE_TYPE(id, typ) \
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static vpx_codec_err_t \
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vpx_codec_control_##id(vpx_codec_ctx_t*, int, typ) UNUSED;\
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\
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static vpx_codec_err_t \
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vpx_codec_control_##id(vpx_codec_ctx_t *ctx, int ctrl_id, typ data) {\
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return vpx_codec_control_(ctx, ctrl_id, data);\
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} /**<\hideinitializer*/
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/*!\brief vpx_codec_control deprecated type definition macro
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*
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* Like #VPX_CTRL_USE_TYPE, but indicates that the specified control is
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* deprecated and should not be used. Consult the documentation for your
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* codec for more information.
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*
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* \internal
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* It defines a static function with the correctly typed arguments as a
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* wrapper to the type-unsafe internal function.
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*/
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# define VPX_CTRL_USE_TYPE_DEPRECATED(id, typ) \
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DECLSPEC_DEPRECATED static vpx_codec_err_t \
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vpx_codec_control_##id(vpx_codec_ctx_t*, int, typ) DEPRECATED UNUSED;\
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\
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DECLSPEC_DEPRECATED static vpx_codec_err_t \
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vpx_codec_control_##id(vpx_codec_ctx_t *ctx, int ctrl_id, typ data) {\
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return vpx_codec_control_(ctx, ctrl_id, data);\
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} /**<\hideinitializer*/
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/*!\brief vpx_codec_control void type definition macro
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*
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* This macro allows for type safe conversions across the variadic parameter
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* to vpx_codec_control_(). It indicates that a given control identifier takes
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* no argument.
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*
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* \internal
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* It defines a static function without a data argument as a wrapper to the
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* type-unsafe internal function.
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*/
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# define VPX_CTRL_VOID(id) \
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static vpx_codec_err_t \
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vpx_codec_control_##id(vpx_codec_ctx_t*, int) UNUSED;\
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\
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static vpx_codec_err_t \
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vpx_codec_control_##id(vpx_codec_ctx_t *ctx, int ctrl_id) {\
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return vpx_codec_control_(ctx, ctrl_id);\
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} /**<\hideinitializer*/
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#endif
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/*!\defgroup cap_xma External Memory Allocation Functions
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*
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* The following functions are required to be implemented for all codecs
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* that advertise the VPX_CODEC_CAP_XMA capability. Calling these functions
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* for codecs that don't advertise this capability will result in an error
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* code being returned, usually VPX_CODEC_INCAPABLE
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* @{
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*/
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/*!\brief Memory Map Entry
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*
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* This structure is used to contain the properties of a memory segment. It
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* is populated by the codec in the request phase, and by the calling
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* application once the requested allocation has been performed.
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*/
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typedef struct vpx_codec_mmap
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{
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/*
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* The following members are set by the codec when requesting a segment
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*/
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unsigned int id; /**< identifier for the segment's contents */
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unsigned long sz; /**< size of the segment, in bytes */
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unsigned int align; /**< required alignment of the segment, in bytes */
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unsigned int flags; /**< bitfield containing segment properties */
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#define VPX_CODEC_MEM_ZERO 0x1 /**< Segment must be zeroed by allocation */
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#define VPX_CODEC_MEM_WRONLY 0x2 /**< Segment need not be readable */
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#define VPX_CODEC_MEM_FAST 0x4 /**< Place in fast memory, if available */
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/* The following members are to be filled in by the allocation function */
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void *base; /**< pointer to the allocated segment */
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void (*dtor)(struct vpx_codec_mmap *map); /**< destructor to call */
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void *priv; /**< allocator private storage */
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} vpx_codec_mmap_t; /**< alias for struct vpx_codec_mmap */
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/*!\brief Iterate over the list of segments to allocate.
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*
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* Iterates over a list of the segments to allocate. The iterator storage
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* should be initialized to NULL to start the iteration. Iteration is complete
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* when this function returns VPX_CODEC_LIST_END. The amount of memory needed to
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* allocate is dependant upon the size of the encoded stream. In cases where the
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* stream is not available at allocation time, a fixed size must be requested.
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* The codec will not be able to operate on streams larger than the size used at
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* allocation time.
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*
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* \param[in] ctx Pointer to this instance's context.
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* \param[out] mmap Pointer to the memory map entry to populate.
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* \param[in,out] iter Iterator storage, initialized to NULL
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|
*
|
|
* \retval #VPX_CODEC_OK
|
|
* The memory map entry was populated.
|
|
* \retval #VPX_CODEC_ERROR
|
|
* Codec does not support XMA mode.
|
|
* \retval #VPX_CODEC_MEM_ERROR
|
|
* Unable to determine segment size from stream info.
|
|
*/
|
|
vpx_codec_err_t vpx_codec_get_mem_map(vpx_codec_ctx_t *ctx,
|
|
vpx_codec_mmap_t *mmap,
|
|
vpx_codec_iter_t *iter);
|
|
|
|
|
|
/*!\brief Identify allocated segments to codec instance
|
|
*
|
|
* Stores a list of allocated segments in the codec. Segments \ref MUST be
|
|
* passed in the order they are read from vpx_codec_get_mem_map(), but may be
|
|
* passed in groups of any size. Segments \ref MUST be set only once. The
|
|
* allocation function \ref MUST ensure that the vpx_codec_mmap_t::base member
|
|
* is non-NULL. If the segment requires cleanup handling (eg, calling free()
|
|
* or close()) then the vpx_codec_mmap_t::dtor member \ref MUST be populated.
|
|
*
|
|
* \param[in] ctx Pointer to this instance's context.
|
|
* \param[in] mmaps Pointer to the first memory map entry in the list.
|
|
* \param[in] num_maps Number of entries being set at this time
|
|
*
|
|
* \retval #VPX_CODEC_OK
|
|
* The segment was stored in the codec context.
|
|
* \retval #VPX_CODEC_INCAPABLE
|
|
* Codec does not support XMA mode.
|
|
* \retval #VPX_CODEC_MEM_ERROR
|
|
* Segment base address was not set, or segment was already stored.
|
|
|
|
*/
|
|
vpx_codec_err_t vpx_codec_set_mem_map(vpx_codec_ctx_t *ctx,
|
|
vpx_codec_mmap_t *mmaps,
|
|
unsigned int num_maps);
|
|
|
|
/*!@} - end defgroup cap_xma*/
|
|
/*!@} - end defgroup codec*/
|
|
|
|
|
|
#endif
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|