ref: e728637b8be3f5d0704a501aed5ac6e44897a584
dir: /vpx/vpx_codec.h/
/*
* Copyright (c) 2010 The WebM project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
/*!\defgroup codec Common Algorithm Interface
* This abstraction allows applications to easily support multiple video
* formats with minimal code duplication. This section describes the interface
* common to all codecs (both encoders and decoders).
* @{
*/
/*!\file
* \brief Describes the codec algorithm interface to applications.
*
* This file describes the interface between an application and a
* video codec algorithm.
*
* An application instantiates a specific codec instance by using
* vpx_codec_init() and a pointer to the algorithm's interface structure:
* <pre>
* my_app.c:
* extern vpx_codec_iface_t my_codec;
* {
* vpx_codec_ctx_t algo;
* res = vpx_codec_init(&algo, &my_codec);
* }
* </pre>
*
* Once initialized, the instance is manged using other functions from
* the vpx_codec_* family.
*/
#ifndef VPX_VPX_VPX_CODEC_H_
#define VPX_VPX_VPX_CODEC_H_
#ifdef __cplusplus
extern "C" {
#endif
#include "./vpx_image.h"
#include "./vpx_integer.h"
/*!\brief Decorator indicating a function is deprecated */
#ifndef VPX_DEPRECATED
#if defined(__GNUC__) && __GNUC__
#define VPX_DEPRECATED __attribute__((deprecated))
#elif defined(_MSC_VER)
#define VPX_DEPRECATED
#else
#define VPX_DEPRECATED
#endif
#endif /* VPX_DEPRECATED */
#ifndef VPX_DECLSPEC_DEPRECATED
#if defined(__GNUC__) && __GNUC__
#define VPX_DECLSPEC_DEPRECATED /**< \copydoc #VPX_DEPRECATED */
#elif defined(_MSC_VER)
/*!\brief \copydoc #VPX_DEPRECATED */
#define VPX_DECLSPEC_DEPRECATED __declspec(deprecated)
#else
#define VPX_DECLSPEC_DEPRECATED /**< \copydoc #VPX_DEPRECATED */
#endif
#endif /* VPX_DECLSPEC_DEPRECATED */
/*!\brief Decorator indicating a function is potentially unused */
#ifndef VPX_UNUSED
#if defined(__GNUC__) || defined(__clang__)
#define VPX_UNUSED __attribute__((unused))
#else
#define VPX_UNUSED
#endif
#endif /* VPX_UNUSED */
/*!\brief Current ABI version number
*
* \internal
* If this file is altered in any way that changes the ABI, this value
* must be bumped. Examples include, but are not limited to, changing
* types, removing or reassigning enums, adding/removing/rearranging
* fields to structures
*/
#define VPX_CODEC_ABI_VERSION (4 + VPX_IMAGE_ABI_VERSION) /**<\hideinitializer*/
/*!\brief Algorithm return codes */
typedef enum {
/*!\brief Operation completed without error */
VPX_CODEC_OK,
/*!\brief Unspecified error */
VPX_CODEC_ERROR,
/*!\brief Memory operation failed */
VPX_CODEC_MEM_ERROR,
/*!\brief ABI version mismatch */
VPX_CODEC_ABI_MISMATCH,
/*!\brief Algorithm does not have required capability */
VPX_CODEC_INCAPABLE,
/*!\brief The given bitstream is not supported.
*
* The bitstream was unable to be parsed at the highest level. The decoder
* is unable to proceed. This error \ref SHOULD be treated as fatal to the
* stream. */
VPX_CODEC_UNSUP_BITSTREAM,
/*!\brief Encoded bitstream uses an unsupported feature
*
* The decoder does not implement a feature required by the encoder. This
* return code should only be used for features that prevent future
* pictures from being properly decoded. This error \ref MAY be treated as
* fatal to the stream or \ref MAY be treated as fatal to the current GOP.
*/
VPX_CODEC_UNSUP_FEATURE,
/*!\brief The coded data for this stream is corrupt or incomplete
*
* There was a problem decoding the current frame. This return code
* should only be used for failures that prevent future pictures from
* being properly decoded. This error \ref MAY be treated as fatal to the
* stream or \ref MAY be treated as fatal to the current GOP. If decoding
* is continued for the current GOP, artifacts may be present.
*/
VPX_CODEC_CORRUPT_FRAME,
/*!\brief An application-supplied parameter is not valid.
*
*/
VPX_CODEC_INVALID_PARAM,
/*!\brief An iterator reached the end of list.
*
*/
VPX_CODEC_LIST_END
} vpx_codec_err_t;
/*! \brief Codec capabilities bitfield
*
* Each codec advertises the capabilities it supports as part of its
* ::vpx_codec_iface_t interface structure. Capabilities are extra interfaces
* or functionality, and are not required to be supported.
*
* The available flags are specified by VPX_CODEC_CAP_* defines.
*/
typedef long vpx_codec_caps_t;
#define VPX_CODEC_CAP_DECODER 0x1 /**< Is a decoder */
#define VPX_CODEC_CAP_ENCODER 0x2 /**< Is an encoder */
/*! Can support images at greater than 8 bitdepth.
*/
#define VPX_CODEC_CAP_HIGHBITDEPTH 0x4
/*! \brief Initialization-time Feature Enabling
*
* Certain codec features must be known at initialization time, to allow for
* proper memory allocation.
*
* The available flags are specified by VPX_CODEC_USE_* defines.
*/
typedef long vpx_codec_flags_t;
/*!\brief Codec interface structure.
*
* Contains function pointers and other data private to the codec
* implementation. This structure is opaque to the application.
*/
typedef const struct vpx_codec_iface vpx_codec_iface_t;
/*!\brief Codec private data structure.
*
* Contains data private to the codec implementation. This structure is opaque
* to the application.
*/
typedef struct vpx_codec_priv vpx_codec_priv_t;
/*!\brief Iterator
*
* Opaque storage used for iterating over lists.
*/
typedef const void *vpx_codec_iter_t;
/*!\brief Codec context structure
*
* All codecs \ref MUST support this context structure fully. In general,
* this data should be considered private to the codec algorithm, and
* not be manipulated or examined by the calling application. Applications
* may reference the 'name' member to get a printable description of the
* algorithm.
*/
typedef struct vpx_codec_ctx {
const char *name; /**< Printable interface name */
vpx_codec_iface_t *iface; /**< Interface pointers */
vpx_codec_err_t err; /**< Last returned error */
const char *err_detail; /**< Detailed info, if available */
vpx_codec_flags_t init_flags; /**< Flags passed at init time */
union {
/**< Decoder Configuration Pointer */
const struct vpx_codec_dec_cfg *dec;
/**< Encoder Configuration Pointer */
const struct vpx_codec_enc_cfg *enc;
const void *raw;
} config; /**< Configuration pointer aliasing union */
vpx_codec_priv_t *priv; /**< Algorithm private storage */
} vpx_codec_ctx_t;
/*!\brief Bit depth for codec
* *
* This enumeration determines the bit depth of the codec.
*/
typedef enum vpx_bit_depth {
VPX_BITS_8 = 8, /**< 8 bits */
VPX_BITS_10 = 10, /**< 10 bits */
VPX_BITS_12 = 12, /**< 12 bits */
} vpx_bit_depth_t;
/*
* Library Version Number Interface
*
* For example, see the following sample return values:
* vpx_codec_version() (1<<16 | 2<<8 | 3)
* vpx_codec_version_str() "v1.2.3-rc1-16-gec6a1ba"
* vpx_codec_version_extra_str() "rc1-16-gec6a1ba"
*/
/*!\brief Return the version information (as an integer)
*
* Returns a packed encoding of the library version number. This will only
* include
* the major.minor.patch component of the version number. Note that this encoded
* value should be accessed through the macros provided, as the encoding may
* change
* in the future.
*
*/
int vpx_codec_version(void);
#define VPX_VERSION_MAJOR(v) \
(((v) >> 16) & 0xff) /**< extract major from packed version */
#define VPX_VERSION_MINOR(v) \
(((v) >> 8) & 0xff) /**< extract minor from packed version */
#define VPX_VERSION_PATCH(v) \
(((v) >> 0) & 0xff) /**< extract patch from packed version */
/*!\brief Return the version major number */
#define vpx_codec_version_major() ((vpx_codec_version() >> 16) & 0xff)
/*!\brief Return the version minor number */
#define vpx_codec_version_minor() ((vpx_codec_version() >> 8) & 0xff)
/*!\brief Return the version patch number */
#define vpx_codec_version_patch() ((vpx_codec_version() >> 0) & 0xff)
/*!\brief Return the version information (as a string)
*
* Returns a printable string containing the full library version number. This
* may
* contain additional text following the three digit version number, as to
* indicate
* release candidates, prerelease versions, etc.
*
*/
const char *vpx_codec_version_str(void);
/*!\brief Return the version information (as a string)
*
* Returns a printable "extra string". This is the component of the string
* returned
* by vpx_codec_version_str() following the three digit version number.
*
*/
const char *vpx_codec_version_extra_str(void);
/*!\brief Return the build configuration
*
* Returns a printable string containing an encoded version of the build
* configuration. This may be useful to vpx support.
*
*/
const char *vpx_codec_build_config(void);
/*!\brief Return the name for a given interface
*
* Returns a human readable string for name of the given codec interface.
*
* \param[in] iface Interface pointer
*
*/
const char *vpx_codec_iface_name(vpx_codec_iface_t *iface);
/*!\brief Convert error number to printable string
*
* Returns a human readable string for the last error returned by the
* algorithm. The returned error will be one line and will not contain
* any newline characters.
*
*
* \param[in] err Error number.
*
*/
const char *vpx_codec_err_to_string(vpx_codec_err_t err);
/*!\brief Retrieve error synopsis for codec context
*
* Returns a human readable string for the last error returned by the
* algorithm. The returned error will be one line and will not contain
* any newline characters.
*
*
* \param[in] ctx Pointer to this instance's context.
*
*/
const char *vpx_codec_error(vpx_codec_ctx_t *ctx);
/*!\brief Retrieve detailed error information for codec context
*
* Returns a human readable string providing detailed information about
* the last error.
*
* \param[in] ctx Pointer to this instance's context.
*
* \retval NULL
* No detailed information is available.
*/
const char *vpx_codec_error_detail(vpx_codec_ctx_t *ctx);
/* REQUIRED FUNCTIONS
*
* The following functions are required to be implemented for all codecs.
* They represent the base case functionality expected of all codecs.
*/
/*!\brief Destroy a codec instance
*
* Destroys a codec context, freeing any associated memory buffers.
*
* \param[in] ctx Pointer to this instance's context
*
* \retval #VPX_CODEC_OK
* The codec algorithm initialized.
* \retval #VPX_CODEC_MEM_ERROR
* Memory allocation failed.
*/
vpx_codec_err_t vpx_codec_destroy(vpx_codec_ctx_t *ctx);
/*!\brief Get the capabilities of an algorithm.
*
* Retrieves the capabilities bitfield from the algorithm's interface.
*
* \param[in] iface Pointer to the algorithm interface
*
*/
vpx_codec_caps_t vpx_codec_get_caps(vpx_codec_iface_t *iface);
/*!\brief Control algorithm
*
* This function is used to exchange algorithm specific data with the codec
* instance. This can be used to implement features specific to a particular
* algorithm.
*
* This wrapper function dispatches the request to the helper function
* associated with the given ctrl_id. It tries to call this function
* transparently, but will return #VPX_CODEC_ERROR if the request could not
* be dispatched.
*
* Note that this function should not be used directly. Call the
* #vpx_codec_control wrapper macro instead.
*
* \param[in] ctx Pointer to this instance's context
* \param[in] ctrl_id Algorithm specific control identifier
*
* \retval #VPX_CODEC_OK
* The control request was processed.
* \retval #VPX_CODEC_ERROR
* The control request was not processed.
* \retval #VPX_CODEC_INVALID_PARAM
* The data was not valid.
*/
vpx_codec_err_t vpx_codec_control_(vpx_codec_ctx_t *ctx, int ctrl_id, ...);
#if defined(VPX_DISABLE_CTRL_TYPECHECKS) && VPX_DISABLE_CTRL_TYPECHECKS
#define vpx_codec_control(ctx, id, data) vpx_codec_control_(ctx, id, data)
#define VPX_CTRL_USE_TYPE(id, typ)
#define VPX_CTRL_USE_TYPE_DEPRECATED(id, typ)
#define VPX_CTRL_VOID(id, typ)
#else
/*!\brief vpx_codec_control wrapper macro
*
* This macro allows for type safe conversions across the variadic parameter
* to vpx_codec_control_().
*
* \internal
* It works by dispatching the call to the control function through a wrapper
* function named with the id parameter.
*/
#define vpx_codec_control(ctx, id, data) \
vpx_codec_control_##id(ctx, id, data) /**<\hideinitializer*/
/*!\brief vpx_codec_control type definition macro
*
* This macro allows for type safe conversions across the variadic parameter
* to vpx_codec_control_(). It defines the type of the argument for a given
* control identifier.
*
* \internal
* It defines a static function with
* the correctly typed arguments as a wrapper to the type-unsafe internal
* function.
*/
#define VPX_CTRL_USE_TYPE(id, typ) \
static vpx_codec_err_t vpx_codec_control_##id(vpx_codec_ctx_t *, int, typ) \
VPX_UNUSED; \
\
static vpx_codec_err_t vpx_codec_control_##id(vpx_codec_ctx_t *ctx, \
int ctrl_id, typ data) { \
return vpx_codec_control_(ctx, ctrl_id, data); \
} /**<\hideinitializer*/
/*!\brief vpx_codec_control deprecated type definition macro
*
* Like #VPX_CTRL_USE_TYPE, but indicates that the specified control is
* deprecated and should not be used. Consult the documentation for your
* codec for more information.
*
* \internal
* It defines a static function with the correctly typed arguments as a
* wrapper to the type-unsafe internal function.
*/
#define VPX_CTRL_USE_TYPE_DEPRECATED(id, typ) \
VPX_DECLSPEC_DEPRECATED static vpx_codec_err_t vpx_codec_control_##id( \
vpx_codec_ctx_t *, int, typ) VPX_DEPRECATED VPX_UNUSED; \
\
VPX_DECLSPEC_DEPRECATED static vpx_codec_err_t vpx_codec_control_##id( \
vpx_codec_ctx_t *ctx, int ctrl_id, typ data) { \
return vpx_codec_control_(ctx, ctrl_id, data); \
} /**<\hideinitializer*/
/*!\brief vpx_codec_control void type definition macro
*
* This macro allows for type safe conversions across the variadic parameter
* to vpx_codec_control_(). It indicates that a given control identifier takes
* no argument.
*
* \internal
* It defines a static function without a data argument as a wrapper to the
* type-unsafe internal function.
*/
#define VPX_CTRL_VOID(id) \
static vpx_codec_err_t vpx_codec_control_##id(vpx_codec_ctx_t *, int) \
VPX_UNUSED; \
\
static vpx_codec_err_t vpx_codec_control_##id(vpx_codec_ctx_t *ctx, \
int ctrl_id) { \
return vpx_codec_control_(ctx, ctrl_id); \
} /**<\hideinitializer*/
#endif
/*!@} - end defgroup codec*/
#ifdef __cplusplus
}
#endif
#endif // VPX_VPX_VPX_CODEC_H_