317 строки
12 KiB
C
317 строки
12 KiB
C
|
/*
|
||
|
|
* 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.
|
||
|
|
*/
|
||
|
|
|
||
|
|
|
||
|
|
/*!\defgroup decoder Decoder Algorithm Interface
|
||
|
|
* \ingroup codec
|
||
|
|
* This abstraction allows applications using this decoder to easily support
|
||
|
|
* multiple video formats with minimal code duplication. This section describes
|
||
|
|
* the interface common to all decoders.
|
||
|
|
* @{
|
||
|
|
*/
|
||
|
|
|
||
|
|
/*!\file vpx_decoder.h
|
||
|
|
* \brief Describes the decoder algorithm interface to applications.
|
||
|
|
*
|
||
|
|
* This file describes the interface between an application and a
|
||
|
|
* video decoder algorithm.
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
#ifdef __cplusplus
|
||
|
|
extern "C" {
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifndef VPX_DECODER_H
|
||
|
|
#define VPX_DECODER_H
|
||
|
|
#include "vpx_codec.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_DECODER_ABI_VERSION (2 + VPX_CODEC_ABI_VERSION) /**<\hideinitializer*/
|
||
|
|
|
||
|
|
/*! \brief Decoder capabilities bitfield
|
||
|
|
*
|
||
|
|
* Each decoder 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 by a decoder.
|
||
|
|
*
|
||
|
|
* The available flags are specifiedby VPX_CODEC_CAP_* defines.
|
||
|
|
*/
|
||
|
|
#define VPX_CODEC_CAP_PUT_SLICE 0x10000 /**< Will issue put_slice callbacks */
|
||
|
|
#define VPX_CODEC_CAP_PUT_FRAME 0x20000 /**< Will issue put_frame callbacks */
|
||
|
|
#define VPX_CODEC_CAP_POSTPROC 0x40000 /**< Can postprocess decoded frame */
|
||
|
|
|
||
|
|
/*! \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.
|
||
|
|
*/
|
||
|
|
#define VPX_CODEC_USE_POSTPROC 0x10000 /**< Postprocess decoded frame */
|
||
|
|
|
||
|
|
/*!\brief Stream properties
|
||
|
|
*
|
||
|
|
* This structure is used to query or set properties of the decoded
|
||
|
|
* stream. Algorithms may extend this structure with data specific
|
||
|
|
* to their bitstream by setting the sz member appropriately.
|
||
|
|
*/
|
||
|
typedef struct vpx_codec_stream_info
|
||
|
|
{
|
||
|
|
unsigned int sz; /**< Size of this structure */
|
||
|
|
unsigned int w; /**< Width (or 0 for unknown/default) */
|
||
|
|
unsigned int h; /**< Height (or 0 for unknown/default) */
|
||
|
|
unsigned int is_kf; /**< Current frame is a keyframe */
|
||
|
|
} vpx_codec_stream_info_t;
|
||
|
|
|
||
|
|
/* REQUIRED FUNCTIONS
|
||
|
|
*
|
||
|
|
* The following functions are required to be implemented for all decoders.
|
||
|
|
* They represent the base case functionality expected of all decoders.
|
||
|
|
*/
|
||
|
|
|
||
|
|
|
||
|
|
/*!\brief Initialization Configurations
|
||
|
|
*
|
||
|
|
* This structure is used to pass init time configuration options to the
|
||
|
|
* decoder.
|
||
|
|
*/
|
||
|
|
typedef struct vpx_codec_dec_cfg
|
||
|
|
{
|
||
|
|
unsigned int threads; /**< Maximum number of threads to use, default 1 */
|
||
|
|
unsigned int w; /**< Width */
|
||
|
|
unsigned int h; /**< Height */
|
||
|
|
} vpx_codec_dec_cfg_t; /**< alias for struct vpx_codec_dec_cfg */
|
||
|
|
|
||
|
|
|
||
|
|
/*!\brief Initialize a decoder instance
|
||
|
|
*
|
||
|
|
* Initializes a decoder context using the given interface. Applications
|
||
|
|
* should call the vpx_codec_dec_init convenience macro instead of this
|
||
|
|
* function directly, to ensure that the ABI version number parameter
|
||
|
|
* is properly initialized.
|
||
|
|
*
|
||
|
|
* In XMA mode (activated by setting VPX_CODEC_USE_XMA in the flags
|
||
|
|
* parameter), the storage pointed to by the cfg parameter must be
|
||
|
|
* kept readable and stable until all memory maps have been set.
|
||
|
|
*
|
||
|
|
* \param[in] ctx Pointer to this instance's context.
|
||
|
|
* \param[in] iface Pointer to the alogrithm interface to use.
|
||
|
|
* \param[in] cfg Configuration to use, if known. May be NULL.
|
||
|
|
* \param[in] flags Bitfield of VPX_CODEC_USE_* flags
|
||
|
|
* \param[in] ver ABI version number. Must be set to
|
||
|
|
* VPX_DECODER_ABI_VERSION
|
||
|
|
* \retval #VPX_CODEC_OK
|
||
|
|
* The decoder algorithm initialized.
|
||
|
|
* \retval #VPX_CODEC_MEM_ERROR
|
||
|
|
* Memory allocation failed.
|
||
|
|
*/
|
||
|
|
vpx_codec_err_t vpx_codec_dec_init_ver(vpx_codec_ctx_t *ctx,
|
||
|
|
vpx_codec_iface_t *iface,
|
||
|
|
vpx_codec_dec_cfg_t *cfg,
|
||
|
|
vpx_codec_flags_t flags,
|
||
|
|
int ver);
|
||
|
|
|
||
|
|
/*!\brief Convenience macro for vpx_codec_dec_init_ver()
|
||
|
|
*
|
||
|
|
* Ensures the ABI version parameter is properly set.
|
||
|
|
*/
|
||
|
|
#define vpx_codec_dec_init(ctx, iface, cfg, flags) \
|
||
|
|
vpx_codec_dec_init_ver(ctx, iface, cfg, flags, VPX_DECODER_ABI_VERSION)
|
||
|
|
|
||
|
|
|
||
|
|
/*!\brief Parse stream info from a buffer
|
||
|
|
*
|
||
|
|
* Performs high level parsing of the bitstream. Construction of a decoder
|
||
|
|
* context is not necessary. Can be used to determine if the bitstream is
|
||
|
|
* of the proper format, and to extract information from the stream.
|
||
|
|
*
|
||
|
|
* \param[in] iface Pointer to the alogrithm interface
|
||
|
|
* \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
|
||
|
|
*/
|
||
|
|
vpx_codec_err_t vpx_codec_peek_stream_info(vpx_codec_iface_t *iface,
|
||
|
|
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
|
||
|
|
*/
|
||
|
|
vpx_codec_err_t vpx_codec_get_stream_info(vpx_codec_ctx_t *ctx,
|
||
|
|
vpx_codec_stream_info_t *si);
|
||
|
|
|
||
|
|
|
||
|
|
/*!\brief Decode data
|
||
|
|
*
|
||
|
|
* Processes a buffer of coded data. If the processing results in a new
|
||
|
|
* decoded frame becoming available, PUT_SLICE and PUT_FRAME events may be
|
||
|
|
* generated, as appropriate. Encoded data \ref MUST be passed in DTS (decode
|
||
|
|
* time stamp) order. Frames produced will always be in PTS (presentation
|
||
|
|
* time stamp) order.
|
||
|
|
*
|
||
|
|
* \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.
|
||
|
|
* \param[in] user_priv Application specific data to associate with
|
||
|
|
* this frame.
|
||
|
|
* \param[in] deadline Soft deadline the decoder should attempt to meet,
|
||
|
|
* in us. Set to zero for unlimited.
|
||
|
|
*
|
||
|
|
* \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.
|
||
|
|
*/
|
||
|
|
vpx_codec_err_t vpx_codec_decode(vpx_codec_ctx_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.
|
||
|
|
*/
|
||
|
|
vpx_image_t *vpx_codec_get_frame(vpx_codec_ctx_t *ctx,
|
||
|
|
vpx_codec_iter_t *iter);
|
||
|
|
|
||
|
|
|
||
|
|
/*!\defgroup cap_put_frame Frame-Based Decoding Functions
|
||
|
|
*
|
||
|
|
* The following functions are required to be implemented for all decoders
|
||
|
|
* that advertise the VPX_CODEC_CAP_PUT_FRAME capability. Calling these functions
|
||
|
|
* for codecs that don't advertise this capability will result in an error
|
||
|
|
* code being returned, usually VPX_CODEC_ERROR
|
||
|
|
* @{
|
||
|
|
*/
|
||
|
|
|
||
|
|
/*!\brief put frame callback prototype
|
||
|
|
*
|
||
|
|
* This callback is invoked by the decoder to notify the application of
|
||
|
|
* the availability of decoded image data.
|
||
|
|
*/
|
||
|
|
typedef void (*vpx_codec_put_frame_cb_fn_t)(void *user_priv,
|
||
|
|
const vpx_image_t *img);
|
||
|
|
|
||
|
|
|
||
|
|
/*!\brief Register for notification of frame completion.
|
||
|
|
*
|
||
|
|
* Registers a given function to be called when a decoded frame is
|
||
|
|
* available.
|
||
|
|
*
|
||
|
|
* \param[in] ctx Pointer to this instance's context
|
||
|
|
* \param[in] cb Pointer to the callback function
|
||
|
|
* \param[in] user_priv User's private data
|
||
|
|
*
|
||
|
|
* \retval #VPX_CODEC_OK
|
||
|
|
* Callback successfully registered.
|
||
|
|
* \retval #VPX_CODEC_ERROR
|
||
|
|
* Decoder context not initialized, or algorithm not capable of
|
||
|
|
* posting slice completion.
|
||
|
|
*/
|
||
|
|
vpx_codec_err_t vpx_codec_register_put_frame_cb(vpx_codec_ctx_t *ctx,
|
||
|
|
vpx_codec_put_frame_cb_fn_t cb,
|
||
|
|
void *user_priv);
|
||
|
|
|
||
|
|
|
||
|
|
/*!@} - end defgroup cap_put_frame */
|
||
|
|
|
||
|
|
/*!\defgroup cap_put_slice Slice-Based Decoding Functions
|
||
|
|
*
|
||
|
|
* The following functions are required to be implemented for all decoders
|
||
|
|
* that advertise the VPX_CODEC_CAP_PUT_SLICE capability. Calling these functions
|
||
|
|
* for codecs that don't advertise this capability will result in an error
|
||
|
|
* code being returned, usually VPX_CODEC_ERROR
|
||
|
|
* @{
|
||
|
|
*/
|
||
|
|
|
||
|
|
/*!\brief put slice callback prototype
|
||
|
|
*
|
||
|
|
* This callback is invoked by the decoder to notify the application of
|
||
|
|
* the availability of partially decoded image data. The
|
||
|
|
*/
|
||
|
|
typedef void (*vpx_codec_put_slice_cb_fn_t)(void *user_priv,
|
||
|
|
const vpx_image_t *img,
|
||
|
|
const vpx_image_rect_t *valid,
|
||
|
|
const vpx_image_rect_t *update);
|
||
|
|
|
||
|
|
|
||
|
|
/*!\brief Register for notification of slice completion.
|
||
|
|
*
|
||
|
|
* Registers a given function to be called when a decoded slice is
|
||
|
|
* available.
|
||
|
|
*
|
||
|
|
* \param[in] ctx Pointer to this instance's context
|
||
|
|
* \param[in] cb Pointer to the callback function
|
||
|
|
* \param[in] user_priv User's private data
|
||
|
|
*
|
||
|
|
* \retval #VPX_CODEC_OK
|
||
|
|
* Callback successfully registered.
|
||
|
|
* \retval #VPX_CODEC_ERROR
|
||
|
|
* Decoder context not initialized, or algorithm not capable of
|
||
|
|
* posting slice completion.
|
||
|
|
*/
|
||
|
|
vpx_codec_err_t vpx_codec_register_put_slice_cb(vpx_codec_ctx_t *ctx,
|
||
|
|
vpx_codec_put_slice_cb_fn_t cb,
|
||
|
|
void *user_priv);
|
||
|
|
|
||
|
|
|
||
|
|
/*!@} - end defgroup cap_put_slice*/
|
||
|
|
|
||
|
|
/*!@} - end defgroup decoder*/
|
||
|
|
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifdef __cplusplus
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#if !defined(VPX_CODEC_DISABLE_COMPAT) || !VPX_CODEC_DISABLE_COMPAT
|
||
|
|
#include "vpx_decoder_compat.h"
|
||
|
|
#endif
|