The Tor Browser: media/libvpx/vpx/vpx_codec.h@ac0c01689b40 (annotated)

media/libvpx/vpx/vpx_codec.h@ac0c01689b40 (annotated)

media/libvpx/vpx/vpx_codec.h

Thu, 15 Jan 2015 15:59:08 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 15 Jan 2015 15:59:08 +0100
branch: TOR_BUG_9701
changeset 10: ac0c01689b40
permissions: -rw-r--r--

Implement a real Private Browsing Mode condition by changing the API/ABI;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

 /*
  *  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_CODEC_H
 #define 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 */
 #define VPX_CODEC_CAP_XMA     0x4 /**< Supports eXternal Memory Allocation */
   /*! \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;
 #define VPX_CODEC_USE_XMA 0x00000001    /**< Use eXternal Memory Allocation mode */
   /*!\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 {
       struct vpx_codec_dec_cfg  *dec;   /**< Decoder Configuration Pointer */
       struct vpx_codec_enc_cfg  *enc;   /**< Encoder Configuration Pointer */
       void                      *raw;
     }                        config;      /**< Configuration pointer aliasing union */
     vpx_codec_priv_t        *priv;        /**< Algorithm private storage */
   } vpx_codec_ctx_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
   /*!\defgroup cap_xma External Memory Allocation Functions
    *
    * The following functions are required to be implemented for all codecs
    * that advertise the VPX_CODEC_CAP_XMA capability. Calling these functions
    * for codecs that don't advertise this capability will result in an error
    * code being returned, usually VPX_CODEC_INCAPABLE
    * @{
    */
   /*!\brief Memory Map Entry
    *
    * This structure is used to contain the properties of a memory segment. It
    * is populated by the codec in the request phase, and by the calling
    * application once the requested allocation has been performed.
    */
   typedef struct vpx_codec_mmap {
     /*
      * The following members are set by the codec when requesting a segment
      */
     unsigned int   id;     /**< identifier for the segment's contents */
     unsigned long  sz;     /**< size of the segment, in bytes */
     unsigned int   align;  /**< required alignment of the segment, in bytes */
     unsigned int   flags;  /**< bitfield containing segment properties */
 #define VPX_CODEC_MEM_ZERO     0x1  /**< Segment must be zeroed by allocation */
 #define VPX_CODEC_MEM_WRONLY   0x2  /**< Segment need not be readable */
 #define VPX_CODEC_MEM_FAST     0x4  /**< Place in fast memory, if available */
     /* The following members are to be filled in by the allocation function */
     void          *base;   /**< pointer to the allocated segment */
     void (*dtor)(struct vpx_codec_mmap *map);         /**< destructor to call */
     void          *priv;   /**< allocator private storage */
   } vpx_codec_mmap_t; /**< alias for struct vpx_codec_mmap */
   /*!\brief Iterate over the list of segments to allocate.
    *
    * Iterates over a list of the segments to allocate. The iterator storage
    * should be initialized to NULL to start the iteration. Iteration is complete
    * when this function returns VPX_CODEC_LIST_END. The amount of memory needed to
    * allocate is dependent upon the size of the encoded stream. In cases where the
    * stream is not available at allocation time, a fixed size must be requested.
    * The codec will not be able to operate on streams larger than the size used at
    * allocation time.
    *
    * \param[in]      ctx     Pointer to this instance's context.
    * \param[out]     mmap    Pointer to the memory map entry to populate.
    * \param[in,out]  iter    Iterator storage, initialized to NULL
    *
    * \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 (e.g., 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*/
 #ifdef __cplusplus
 }
 #endif
 #endif

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media/libvpx/vpx/vpx_codec.h@ac0c01689b40 (annotated)

media/libvpx/vpx/vpx_codec.h