| /* | |
| * 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" | |
| #include "config/aom_config.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 */ | |
| #if CONFIG_TXFMBLK_LOGS || CONFIG_COEFF_LOGS | |
| const char *txfm_declog; /**< Filename for transform logs */ | |
| #endif // CONFIG_TXFMBLK_LOGS || CONFIG_COEFF_LOGS | |
| } 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_ |