480 строки
15 KiB
C
480 строки
15 KiB
C
/*
|
|
* 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_CODEC_H_
|
|
#define VPX_VPX_CODEC_H_
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
#include "./vpx_integer.h"
|
|
#include "./vpx_image.h"
|
|
|
|
/*!\brief Decorator indicating a function is deprecated */
|
|
#ifndef DEPRECATED
|
|
#if defined(__GNUC__) && __GNUC__
|
|
#define DEPRECATED __attribute__ ((deprecated))
|
|
#elif defined(_MSC_VER)
|
|
#define DEPRECATED
|
|
#else
|
|
#define DEPRECATED
|
|
#endif
|
|
#endif /* DEPRECATED */
|
|
|
|
#ifndef DECLSPEC_DEPRECATED
|
|
#if defined(__GNUC__) && __GNUC__
|
|
#define DECLSPEC_DEPRECATED /**< \copydoc #DEPRECATED */
|
|
#elif defined(_MSC_VER)
|
|
#define DECLSPEC_DEPRECATED __declspec(deprecated) /**< \copydoc #DEPRECATED */
|
|
#else
|
|
#define DECLSPEC_DEPRECATED /**< \copydoc #DEPRECATED */
|
|
#endif
|
|
#endif /* DECLSPEC_DEPRECATED */
|
|
|
|
/*!\brief Decorator indicating a function is potentially unused */
|
|
#ifdef UNUSED
|
|
#elif __GNUC__
|
|
#define UNUSED __attribute__ ((unused))
|
|
#else
|
|
#define UNUSED
|
|
#endif
|
|
|
|
/*!\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 (2 + 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 */
|
|
|
|
|
|
/*! \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) 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) \
|
|
DECLSPEC_DEPRECATED static vpx_codec_err_t \
|
|
vpx_codec_control_##id(vpx_codec_ctx_t*, int, typ) DEPRECATED UNUSED;\
|
|
\
|
|
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) 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_CODEC_H_
|
|
|