/*
* 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,
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 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 descriptio
