ref: ef53898c48a3130c757628d8057b0dcfefcb637a
dir: /vpx/internal/vpx_codec_internal.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.
*/
/*!\file
* \brief Describes the decoder algorithm interface for algorithm
* implementations.
*
* This file defines the private structures and data types that are only
* relevant to implementing an algorithm, as opposed to using it.
*
* To create a decoder algorithm class, an interface structure is put
* into the global namespace:
* <pre>
* my_codec.c:
* vpx_codec_iface_t my_codec = {
* "My Codec v1.0",
* VPX_CODEC_ALG_ABI_VERSION,
* ...
* };
* </pre>
*
* An application instantiates a specific decoder 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_INTERNAL_VPX_CODEC_INTERNAL_H_
#define VPX_INTERNAL_VPX_CODEC_INTERNAL_H_
#include "../vpx_decoder.h"
#include "../vpx_encoder.h"
#include <stdarg.h>
#ifdef __cplusplus
extern "C" {
#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_INTERNAL_ABI_VERSION (5) /**<\hideinitializer*/
typedef struct vpx_codec_alg_priv vpx_codec_alg_priv_t;
typedef struct vpx_codec_priv_enc_mr_cfg vpx_codec_priv_enc_mr_cfg_t;
/*!\brief init function pointer prototype
*
* Performs algorithm-specific initialization of the decoder context. This
* function is called by the generic vpx_codec_init() wrapper function, so
* plugins implementing this interface may trust the input parameters to be
* properly initialized.
*
* \param[in] ctx Pointer to this instance's context
* \retval #VPX_CODEC_OK
* The input stream was recognized and decoder initialized.
* \retval #VPX_CODEC_MEM_ERROR
* Memory operation failed.
*/
typedef vpx_codec_err_t (*vpx_codec_init_fn_t)(vpx_codec_ctx_t *ctx,
vpx_codec_priv_enc_mr_cfg_t *data);
/*!\brief destroy function pointer prototype
*
* Performs algorithm-specific destruction of the decoder context. This
* function is called by the generic vpx_codec_destroy() wrapper function,
* so plugins implementing this interface may trust the input parameters
* to be properly initialized.
*
* \param[in] ctx Pointer to this instance's context
* \retval #VPX_CODEC_OK
* The input stream was recognized and decoder initialized.
* \retval #VPX_CODEC_MEM_ERROR
* Memory operation failed.
*/
typedef vpx_codec_err_t (*vpx_codec_destroy_fn_t)(vpx_codec_alg_priv_t *ctx);
/*!\brief parse stream info function pointer prototype
*
* Performs high level parsing of the bitstream. This function is called by the
* generic vpx_codec_peek_stream_info() wrapper function, so plugins
* implementing this interface may trust the input parameters to be properly
* initialized.
*
* \param[in] data Pointer to a block of data to parse
* \param[in] data_sz Size of the data buffer
* \param[in,out] si Pointer to stream info to update. The size member
* \ref MUST be properly initialized, but \ref MAY be
* clobbered by the algorithm. This parameter \ref MAY
* be NULL.
*
* \retval #VPX_CODEC_OK
* Bitstream is parsable and stream information updated
*/
typedef vpx_codec_err_t (*vpx_codec_peek_si_fn_t)(const uint8_t *data,
unsigned int data_sz,
vpx_codec_stream_info_t *si);
/*!\brief Return information about the current stream.
*
* Returns information about the stream that has been parsed during decoding.
*
* \param[in] ctx Pointer to this instance's context
* \param[in,out] si Pointer to stream info to update. The size member
* \ref MUST be properly initialized, but \ref MAY be
* clobbered by the algorithm. This parameter \ref MAY
* be NULL.
*
* \retval #VPX_CODEC_OK
* Bitstream is parsable and stream information updated
*/
typedef vpx_codec_err_t (*vpx_codec_get_si_fn_t)(vpx_codec_alg_priv_t *ctx,
vpx_codec_stream_info_t *si);
/*!\brief control function pointer prototype
*
* This function is used to exchange algorithm specific data with the decoder
* instance. This can be used to implement features specific to a particular
* algorithm.
*
* This function is called by the generic vpx_codec_control() wrapper
* function, so plugins implementing this interface may trust the input
* parameters to be properly initialized. However, this interface does not
* provide type safety for the exchanged data or assign meanings to the
* control codes. Those details should be specified in the algorithm's
* header file. In particular, the ctrl_id parameter is guaranteed to exist
* in the algorithm's control mapping table, and the data parameter may be NULL.
*
*
* \param[in] ctx Pointer to this instance's context
* \param[in] ctrl_id Algorithm specific control identifier
* \param[in,out] data Data to exchange with algorithm instance.
*
* \retval #VPX_CODEC_OK
* The internal state data was deserialized.
*/
typedef vpx_codec_err_t (*vpx_codec_control_fn_t)(vpx_codec_alg_priv_t *ctx,
va_list ap);
/*!\brief control function pointer mapping
*
* This structure stores the mapping between control identifiers and
* implementing functions. Each algorithm provides a list of these
* mappings. This list is searched by the vpx_codec_control() wrapper
* function to determine which function to invoke. The special
* value {0, NULL} is used to indicate end-of-list, and must be
* present. The special value {0, <non-null>} can be used as a catch-all
* mapping. This implies that ctrl_id values chosen by the algorithm
* \ref MUST be non-zero.
*/
typedef const struct vpx_codec_ctrl_fn_map {
int ctrl_id;
vpx_codec_control_fn_t fn;
} vpx_codec_ctrl_fn_map_t;
/*!\brief decode data function pointer prototype
*
* Processes a buffer of coded data. If the processing results in a new
* decoded frame becoming available, #VPX_CODEC_CB_PUT_SLICE and
* #VPX_CODEC_CB_PUT_FRAME events are generated as appropriate. This
* function is called by the generic vpx_codec_decode() wrapper function,
* so plugins implementing this interface may trust the input parameters
* to be properly initialized.
*
* \param[in] ctx Pointer to this instance's context
* \param[in] data Pointer to this block of new coded data. If
* NULL, a #VPX_CODEC_CB_PUT_FRAME event is posted
* for the previously decoded frame.
* \param[in] data_sz Size of the coded data, in bytes.
*
* \return Returns #VPX_CODEC_OK if the coded data was processed completely
* and future pictures can be decoded without error. Otherwise,
* see the descriptions of the other error codes in ::vpx_codec_err_t
* for recoverability capabilities.
*/
typedef vpx_codec_err_t (*vpx_codec_decode_fn_t)(vpx_codec_alg_priv_t *ctx,
const uint8_t *data,
unsigned int data_sz,
void *user_priv,
long deadline);
/*!\brief Decoded frames iterator
*
* Iterates over a list of the frames available for display. The iterator
* storage should be initialized to NULL to start the iteration. Iteration is
* complete when this function returns NULL.
*
* The list of available frames becomes valid upon completion of the
* vpx_codec_decode call, and remains valid until the next call to vpx_codec_decode.
*
* \param[in] ctx Pointer to this instance's context
* \param[in out] iter Iterator storage, initialized to NULL
*
* \return Returns a pointer to an image, if one is ready for display. Frames
* produced will always be in PTS (presentation time stamp) order.
*/
typedef vpx_image_t *(*vpx_codec_get_frame_fn_t)(vpx_codec_alg_priv_t *ctx,
vpx_codec_iter_t *iter);
/*!\brief Pass in external frame buffers for the decoder to use.
*
* Registers functions to be called when libvpx needs a frame buffer
* to decode the current frame and a function to be called when libvpx does
* not internally reference the frame buffer. This set function must
* be called before the first call to decode or libvpx will assume the
* default behavior of allocating frame buffers internally.
*
* \param[in] ctx Pointer to this instance's context
* \param[in] cb_get Pointer to the get callback function
* \param[in] cb_release Pointer to the release callback function
* \param[in] cb_priv Callback's private data
*
* \retval #VPX_CODEC_OK
* External frame buffers will be used by libvpx.
* \retval #VPX_CODEC_INVALID_PARAM
* One or more of the callbacks were NULL.
* \retval #VPX_CODEC_ERROR
* Decoder context not initialized, or algorithm not capable of
* using external frame buffers.
*
* \note
* When decoding VP9, the application may be required to pass in at least
* #VP9_MAXIMUM_REF_BUFFERS + #VPX_MAXIMUM_WORK_BUFFERS external frame
* buffers.
*/
typedef vpx_codec_err_t (*vpx_codec_set_fb_fn_t)(
vpx_codec_alg_priv_t *ctx,
vpx_get_frame_buffer_cb_fn_t cb_get,
vpx_release_frame_buffer_cb_fn_t cb_release, void *cb_priv);
typedef vpx_codec_err_t (*vpx_codec_encode_fn_t)(vpx_codec_alg_priv_t *ctx,
const vpx_image_t *img,
vpx_codec_pts_t pts,
unsigned long duration,
vpx_enc_frame_flags_t flags,
unsigned long deadline);
typedef const vpx_codec_cx_pkt_t *(*vpx_codec_get_cx_data_fn_t)(vpx_codec_alg_priv_t *ctx,
vpx_codec_iter_t *iter);
typedef vpx_codec_err_t
(*vpx_codec_enc_config_set_fn_t)(vpx_codec_alg_priv_t *ctx,
const vpx_codec_enc_cfg_t *cfg);
typedef vpx_fixed_buf_t *
(*vpx_codec_get_global_headers_fn_t)(vpx_codec_alg_priv_t *ctx);
typedef vpx_image_t *
(*vpx_codec_get_preview_frame_fn_t)(vpx_codec_alg_priv_t *ctx);
typedef vpx_codec_err_t
(*vpx_codec_enc_mr_get_mem_loc_fn_t)(const vpx_codec_enc_cfg_t *cfg,
void **mem_loc);
/*!\brief usage configuration mapping
*
* This structure stores the mapping between usage identifiers and
* configuration structures. Each algorithm provides a list of these
* mappings. This list is searched by the vpx_codec_enc_config_default()
* wrapper function to determine which config to return. The special value
* {-1, {0}} is used to indicate end-of-list, and must be present. At least
* one mapping must be present, in addition to the end-of-list.
*
*/
typedef const struct vpx_codec_enc_cfg_map {
int usage;
vpx_codec_enc_cfg_t cfg;
} vpx_codec_enc_cfg_map_t;
/*!\brief Decoder algorithm interface interface
*
* All decoders \ref MUST expose a variable of this type.
*/
struct vpx_codec_iface {
const char *name; /**< Identification String */
int abi_version; /**< Implemented ABI version */
vpx_codec_caps_t caps; /**< Decoder capabilities */
vpx_codec_init_fn_t init; /**< \copydoc ::vpx_codec_init_fn_t */
vpx_codec_destroy_fn_t destroy; /**< \copydoc ::vpx_codec_destroy_fn_t */
vpx_codec_ctrl_fn_map_t *ctrl_maps; /**< \copydoc ::vpx_codec_ctrl_fn_map_t */
struct vpx_codec_dec_iface {
vpx_codec_peek_si_fn_t peek_si; /**< \copydoc ::vpx_codec_peek_si_fn_t */
vpx_codec_get_si_fn_t get_si; /**< \copydoc ::vpx_codec_get_si_fn_t */
vpx_codec_decode_fn_t decode; /**< \copydoc ::vpx_codec_decode_fn_t */
vpx_codec_get_frame_fn_t get_frame; /**< \copydoc ::vpx_codec_get_frame_fn_t */
vpx_codec_set_fb_fn_t set_fb_fn; /**< \copydoc ::vpx_codec_set_fb_fn_t */
} dec;
struct vpx_codec_enc_iface {
int cfg_map_count;
vpx_codec_enc_cfg_map_t *cfg_maps; /**< \copydoc ::vpx_codec_enc_cfg_map_t */
vpx_codec_encode_fn_t encode; /**< \copydoc ::vpx_codec_encode_fn_t */
vpx_codec_get_cx_data_fn_t get_cx_data; /**< \copydoc ::vpx_codec_get_cx_data_fn_t */
vpx_codec_enc_config_set_fn_t cfg_set; /**< \copydoc ::vpx_codec_enc_config_set_fn_t */
vpx_codec_get_global_headers_fn_t get_glob_hdrs; /**< \copydoc ::vpx_codec_get_global_headers_fn_t */
vpx_codec_get_preview_frame_fn_t get_preview; /**< \copydoc ::vpx_codec_get_preview_frame_fn_t */
vpx_codec_enc_mr_get_mem_loc_fn_t mr_get_mem_loc; /**< \copydoc ::vpx_codec_enc_mr_get_mem_loc_fn_t */
} enc;
};
/*!\brief Callback function pointer / user data pair storage */
typedef struct vpx_codec_priv_cb_pair {
union {
vpx_codec_put_frame_cb_fn_t put_frame;
vpx_codec_put_slice_cb_fn_t put_slice;
} u;
void *user_priv;
} vpx_codec_priv_cb_pair_t;
/*!\brief Instance private storage
*
* This structure is allocated by the algorithm's init function. It can be
* extended in one of two ways. First, a second, algorithm specific structure
* can be allocated and the priv member pointed to it. Alternatively, this
* structure can be made the first member of the algorithm specific structure,
* and the pointer cast to the proper type.
*/
struct vpx_codec_priv {
const char *err_detail;
vpx_codec_flags_t init_flags;
struct {
vpx_codec_priv_cb_pair_t put_frame_cb;
vpx_codec_priv_cb_pair_t put_slice_cb;
} dec;
struct {
vpx_fixed_buf_t cx_data_dst_buf;
unsigned int cx_data_pad_before;
unsigned int cx_data_pad_after;
vpx_codec_cx_pkt_t cx_data_pkt;
unsigned int total_encoders;
} enc;
};
/*
* Multi-resolution encoding internal configuration
*/
struct vpx_codec_priv_enc_mr_cfg
{
unsigned int mr_total_resolutions;
unsigned int mr_encoder_id;
struct vpx_rational mr_down_sampling_factor;
void* mr_low_res_mode_info;
};
#undef VPX_CTRL_USE_TYPE
#define VPX_CTRL_USE_TYPE(id, typ) \
static VPX_INLINE typ id##__value(va_list args) {return va_arg(args, typ);}
#undef VPX_CTRL_USE_TYPE_DEPRECATED
#define VPX_CTRL_USE_TYPE_DEPRECATED(id, typ) \
static VPX_INLINE typ id##__value(va_list args) {return va_arg(args, typ);}
#define CAST(id, arg) id##__value(arg)
/* CODEC_INTERFACE convenience macro
*
* By convention, each codec interface is a struct with extern linkage, where
* the symbol is suffixed with _algo. A getter function is also defined to
* return a pointer to the struct, since in some cases it's easier to work
* with text symbols than data symbols (see issue #169). This function has
* the same name as the struct, less the _algo suffix. The CODEC_INTERFACE
* macro is provided to define this getter function automatically.
*/
#define CODEC_INTERFACE(id)\
vpx_codec_iface_t* id(void) { return &id##_algo; }\
vpx_codec_iface_t id##_algo
/* Internal Utility Functions
*
* The following functions are intended to be used inside algorithms as
* utilities for manipulating vpx_codec_* data structures.
*/
struct vpx_codec_pkt_list {
unsigned int cnt;
unsigned int max;
struct vpx_codec_cx_pkt pkts[1];
};
#define vpx_codec_pkt_list_decl(n)\
union {struct vpx_codec_pkt_list head;\
struct {struct vpx_codec_pkt_list head;\
struct vpx_codec_cx_pkt pkts[n];} alloc;}
#define vpx_codec_pkt_list_init(m)\
(m)->alloc.head.cnt = 0,\
(m)->alloc.head.max = sizeof((m)->alloc.pkts) / sizeof((m)->alloc.pkts[0])
int
vpx_codec_pkt_list_add(struct vpx_codec_pkt_list *,
const struct vpx_codec_cx_pkt *);
const vpx_codec_cx_pkt_t *
vpx_codec_pkt_list_get(struct vpx_codec_pkt_list *list,
vpx_codec_iter_t *iter);
#include <stdio.h>
#include <setjmp.h>
struct vpx_internal_error_info {
vpx_codec_err_t error_code;
int has_detail;
char detail[80];
int setjmp;
jmp_buf jmp;
};
void vpx_internal_error(struct vpx_internal_error_info *info,
vpx_codec_err_t error,
const char *fmt,
...);
#ifdef __cplusplus
} // extern "C"
#endif
#endif // VPX_INTERNAL_VPX_CODEC_INTERNAL_H_