| /* |
| * Copyright (c) 2021, Alliance for Open Media. All rights reserved |
| * |
| * This source code is subject to the terms of the BSD 3-Clause Clear License |
| * and the Alliance for Open Media Patent License 1.0. If the BSD 3-Clause Clear |
| * License was not distributed with this source code in the LICENSE file, you |
| * can obtain it at aomedia.org/license/software-license/bsd-3-c-c/. If the |
| * Alliance for Open Media Patent License 1.0 was not distributed with this |
| * source code in the PATENTS file, you can obtain it at |
| * aomedia.org/license/patent-license/. |
| */ |
| #ifndef AOM_AOM_AOM_DECODER_H_ |
| #define AOM_AOM_AOM_DECODER_H_ |
| |
| /*!\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 |
| * \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 |
| |
| #include "aom/aom_codec.h" |
| #include "aom/aom_frame_buffer.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 AOM_DECODER_ABI_VERSION \ |
| (6 + AOM_CODEC_ABI_VERSION) /**<\hideinitializer*/ |
| |
| /*! \brief Decoder capabilities bitfield |
| * |
| * Each decoder advertises the capabilities it supports as part of its |
| * ::aom_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 specified by AOM_CODEC_CAP_* defines. |
| */ |
| /*!brief Can support external frame buffers */ |
| #define AOM_CODEC_CAP_EXTERNAL_FRAME_BUFFER 0x200000 |
| |
| /*! \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 AOM_CODEC_USE_* defines. |
| */ |
| |
| /*!\brief Stream properties |
| * |
| * This structure is used to query or set properties of the decoded |
| * stream. |
| */ |
| typedef struct aom_codec_stream_info { |
| 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 */ |
| unsigned int number_spatial_layers; /**< Number of spatial layers */ |
| unsigned int number_temporal_layers; /**< Number of temporal layers */ |
| unsigned int is_annexb; /**< Is Bitstream in Annex-B format */ |
| } aom_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 aom_codec_dec_cfg { |
| unsigned int threads; /**< Maximum number of threads to use, default 1 */ |
| unsigned int w; /**< Width */ |
| unsigned int h; /**< Height */ |
| } aom_codec_dec_cfg_t; /**< alias for struct aom_codec_dec_cfg */ |
| |
| /*!\brief Initialize a decoder instance |
| * |
| * Initializes a decoder context using the given interface. Applications |
| * should call the aom_codec_dec_init convenience macro instead of this |
| * function directly, to ensure that the ABI version number parameter |
| * is properly initialized. |
| * |
| * If the library was configured with cmake -DCONFIG_MULTITHREAD=0, this |
| * call is not thread safe and should be guarded with a lock if being used |
| * in a multithreaded context. |
| * |
| * \param[in] ctx Pointer to this instance's context. |
| * \param[in] iface Pointer to the algorithm interface to use. |
| * \param[in] cfg Configuration to use, if known. May be NULL. |
| * \param[in] flags Bitfield of AOM_CODEC_USE_* flags |
| * \param[in] ver ABI version number. Must be set to |
| * AOM_DECODER_ABI_VERSION |
| * \retval #AOM_CODEC_OK |
| * The decoder algorithm initialized. |
| * \retval #AOM_CODEC_MEM_ERROR |
| * Memory allocation failed. |
| */ |
| aom_codec_err_t aom_codec_dec_init_ver(aom_codec_ctx_t *ctx, |
| aom_codec_iface_t *iface, |
| const aom_codec_dec_cfg_t *cfg, |
| aom_codec_flags_t flags, int ver); |
| |
| /*!\brief Convenience macro for aom_codec_dec_init_ver() |
| * |
| * Ensures the ABI version parameter is properly set. |
| */ |
| #define aom_codec_dec_init(ctx, iface, cfg, flags) \ |
| aom_codec_dec_init_ver(ctx, iface, cfg, flags, AOM_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 algorithm 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 is_annexb |
| * member \ref MUST be properly initialized. This |
| * function sets the rest of the members. |
| * |
| * \retval #AOM_CODEC_OK |
| * Bitstream is parsable and stream information updated. |
| * \retval #AOM_CODEC_INVALID_PARAM |
| * One of the arguments is invalid, for example a NULL pointer. |
| * \retval #AOM_CODEC_UNSUP_BITSTREAM |
| * The decoder didn't recognize the coded data, or the |
| * buffer was too short. |
| */ |
| aom_codec_err_t aom_codec_peek_stream_info(aom_codec_iface_t *iface, |
| const uint8_t *data, size_t data_sz, |
| aom_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. |
| * |
| * \retval #AOM_CODEC_OK |
| * Bitstream is parsable and stream information updated. |
| * \retval #AOM_CODEC_INVALID_PARAM |
| * One of the arguments is invalid, for example a NULL pointer. |
| * \retval #AOM_CODEC_UNSUP_BITSTREAM |
| * The decoder couldn't parse the submitted data. |
| */ |
| aom_codec_err_t aom_codec_get_stream_info(aom_codec_ctx_t *ctx, |
| aom_codec_stream_info_t *si); |
| |
| /*!\brief Decode data |
| * |
| * Processes a buffer of coded data. 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. |
| * \param[in] data_sz Size of the coded data, in bytes. |
| * \param[in] user_priv Application specific data to associate with |
| * this frame. |
| * |
| * \return Returns #AOM_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 ::aom_codec_err_t |
| * for recoverability capabilities. |
| */ |
| aom_codec_err_t aom_codec_decode(aom_codec_ctx_t *ctx, const uint8_t *data, |
| size_t data_sz, void *user_priv); |
| |
| /*!\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 |
| * aom_codec_decode call, and remains valid until the next call to |
| * aom_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. |
| */ |
| aom_image_t *aom_codec_get_frame(aom_codec_ctx_t *ctx, aom_codec_iter_t *iter); |
| |
| /*!\brief Decoded frames peek |
| * |
| * Peeks the next frame from a list of the frames available for display. |
| * The iterator points to the index of the frame to peek, but does not |
| * increment it. |
| * |
| * The list of available frames becomes valid upon completion of the |
| * aom_codec_decode call, and remains valid until the next call to |
| * aom_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. |
| */ |
| aom_image_t *aom_codec_peek_frame(aom_codec_ctx_t *ctx, aom_codec_iter_t *iter); |
| |
| /*!\defgroup cap_external_frame_buffer External Frame Buffer Functions |
| * |
| * The following function is required to be implemented for all decoders |
| * that advertise the AOM_CODEC_CAP_EXTERNAL_FRAME_BUFFER capability. |
| * Calling this function for codecs that don't advertise this capability |
| * will result in an error code being returned, usually AOM_CODEC_INCAPABLE. |
| * @{ |
| */ |
| |
| /*!\brief Pass in external frame buffers for the decoder to use. |
| * |
| * Registers functions to be called when libaom needs a frame buffer |
| * to decode the current frame and a function to be called when libaom does |
| * not internally reference the frame buffer. This set function must |
| * be called before the first call to decode or libaom 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 #AOM_CODEC_OK |
| * External frame buffers will be used by libaom. |
| * \retval #AOM_CODEC_INVALID_PARAM |
| * One or more of the callbacks were NULL. |
| * \retval #AOM_CODEC_ERROR |
| * Decoder context not initialized. |
| * \retval #AOM_CODEC_INCAPABLE |
| * Algorithm not capable of using external frame buffers. |
| * |
| * \note |
| * When decoding AV1, the application may be required to pass in at least |
| * #AOM_MAXIMUM_WORK_BUFFERS external frame buffers. |
| */ |
| aom_codec_err_t aom_codec_set_frame_buffer_functions( |
| aom_codec_ctx_t *ctx, aom_get_frame_buffer_cb_fn_t cb_get, |
| aom_release_frame_buffer_cb_fn_t cb_release, void *cb_priv); |
| |
| /*!@} - end defgroup cap_external_frame_buffer */ |
| |
| /*!@} - end defgroup decoder*/ |
| #ifdef __cplusplus |
| } |
| #endif |
| #endif // AOM_AOM_AOM_DECODER_H_ |
