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/*
* Copyright (c) 2010 The VP8 project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license and patent
* grant that can be found in the LICENSE file in the root of the source
* tree. All contributing project authors may be found in the AUTHORS
* file in the root of the source tree.
*/
/*!\file decoder_impl.h
* \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_CODEC_INTERNAL_H
#define VPX_CODEC_INTERNAL_H
#include "../vpx_decoder.h"
#include "../vpx_encoder.h"
#include <stdarg.h>
/*!\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 (2) /**<\hideinitializer*/
typedef struct vpx_codec_alg_priv vpx_codec_alg_priv_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);
/*!\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_parse_stream() 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 paramter 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,
int ctrl_id,
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
{
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 e_xternal Memory Allocation memory map get iterator
*
* Iterates over a list of the memory maps requested by the decoder. The
* iterator storage should be initialized to NULL to start the iteration.
* Iteration is complete when this function returns NULL.
*
* \param[in out] iter Iterator storage, initialized to NULL
*
* \return Returns a pointer to an memory segment descriptor, or NULL to
* indicate end-of-list.
*/
typedef vpx_codec_err_t (*vpx_codec_get_mmap_fn_t)(const vpx_codec_ctx_t *ctx,
vpx_codec_mmap_t *mmap,
vpx_codec_iter_t *iter);
/*\brief e_xternal Memory Allocation memory map set iterator
*
* Sets a memory descriptor inside the decoder instance.
*
* \param[in] ctx Pointer to this instance's context
* \param[in] mmap Memory map to store.
*
* \retval #VPX_CODEC_OK
* The memory map was accepted and stored.
* \retval #VPX_CODEC_MEM_ERROR
* The memory map was rejected.
*/
typedef vpx_codec_err_t (*vpx_codec_set_mmap_fn_t)(vpx_codec_ctx_t *ctx,
const vpx_codec_mmap_t *mmap);
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);
/*!\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
{
int usage;
vpx_codec_enc_cfg_t cfg;
} vpx_codec_enc_cfg_map_t;
#define NOT_IMPLEMENTED 0
/*!\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 */
vpx_codec_get_mmap_fn_t get_mmap; /**< \copydoc ::vpx_codec_get_mmap_fn_t */
vpx_codec_set_mmap_fn_t set_mmap; /**< \copydoc ::vpx_codec_set_mmap_fn_t */
struct
{
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_peek_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 */
} dec;
struct
{
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_enc_config_set_fn_t */
vpx_codec_get_preview_frame_fn_t get_preview; /**< \copydoc ::vpx_codec_get_preview_frame_fn_t */
} enc;
};
/*!\brief Callback function pointer / user data pair storage */
typedef struct
{
union
{
vpx_codec_put_frame_cb_fn_t put_frame;
vpx_codec_put_slice_cb_fn_t put_slice;
};
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 casted to the proper type.
*/
struct vpx_codec_priv
{
unsigned int sz;
vpx_codec_iface_t *iface;
struct vpx_codec_alg_priv *alg_priv;
const char *err_detail;
unsigned int eval_counter;
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
{
int tbd;
struct vpx_fixed_buf cx_data_dst_buf;
unsigned int cx_data_pad_before;
unsigned int cx_data_pad_after;
vpx_codec_cx_pkt_t cx_data_pkt;
} enc;
};
#undef VPX_CTRL_USE_TYPE
#define VPX_CTRL_USE_TYPE(id, typ) \
static typ id##__value(va_list args) {return va_arg(args, typ);} \
static typ id##__convert(void *x)\
{\
union\
{\
void *x;\
typ d;\
} u;\
u.x = x;\
return u.d;\
}
#undef VPX_CTRL_USE_TYPE_DEPRECATED
#define VPX_CTRL_USE_TYPE_DEPRECATED(id, typ) \
static typ id##__value(va_list args) {return va_arg(args, typ);} \
static typ id##__convert(void *x)\
{\
union\
{\
void *x;\
typ d;\
} u;\
u.x = x;\
return u.d;\
}
#define CAST(id, arg) id##__value(arg)
#define RECAST(id, x) id##__convert(x)
/* Internal Utility Functions
*
* The following functions are indended 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;
};
static void vpx_internal_error(struct vpx_internal_error_info *info,
vpx_codec_err_t error,
const char *fmt,
...)
{
va_list ap;
info->error_code = error;
info->has_detail = 0;
if (fmt)
{
size_t sz = sizeof(info->detail);
info->has_detail = 1;
va_start(ap, fmt);
vsnprintf(info->detail, sz - 1, fmt, ap);
va_end(ap);
info->detail[sz-1] = '\0';
}
if (info->setjmp)
longjmp(info->jmp, info->error_code);
}
#endif