| /* |
| * Copyright (c) 2016, Alliance for Open Media. All rights reserved |
| * |
| * This source code is subject to the terms of the BSD 2 Clause License and |
| * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License |
| * was not distributed with this source code in the LICENSE file, you can |
| * obtain it at www.aomedia.org/license/software. 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 www.aomedia.org/license/patent. |
| */ |
| #ifndef AOM_AOM_DECODER_H_ |
| #define 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_codec.h" |
| #include "./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 \ |
| (3 + 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. |
| */ |
| #define AOM_CODEC_CAP_PUT_SLICE 0x10000 /**< Will issue put_slice callbacks */ |
| #define AOM_CODEC_CAP_PUT_FRAME 0x20000 /**< Will issue put_frame callbacks */ |
| #define AOM_CODEC_CAP_POSTPROC 0x40000 /**< Can postprocess decoded frame */ |
| /*!\brief Can receive encoded frames one fragment at a time */ |
| #define AOM_CODEC_CAP_INPUT_FRAGMENTS 0x100000 |
| |
| /*! \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 Can support frame-based multi-threading */ |
| #define AOM_CODEC_CAP_FRAME_THREADING 0x200000 |
| /*!brief Can support external frame buffers */ |
| #define AOM_CODEC_CAP_EXTERNAL_FRAME_BUFFER 0x400000 |
| |
| #define AOM_CODEC_USE_POSTPROC 0x10000 /**< Postprocess decoded frame */ |
| /*!\brief The input frame should be passed to the decoder one fragment at a |
| * time */ |
| #define AOM_CODEC_USE_INPUT_FRAGMENTS 0x40000 |
| /*!\brief Enable frame-based multi-threading */ |
| #define AOM_CODEC_USE_FRAME_THREADING 0x80000 |
| |
| /*!\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 */ |
| } 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 */ |
| unsigned int allow_lowbitdepth; /**< Allow use of low-bitdepth coding path */ |
| } 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 --disable-multithread, 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. |
| * |
| * \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, |
| unsigned int 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. 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. |
| * If the decoder is configured with AOM_CODEC_USE_INPUT_FRAGMENTS enabled, |
| * data and data_sz can contain a fragment of the encoded frame. Fragment |
| * \#n must contain at least partition \#n, but can also contain subsequent |
| * partitions (\#n+1 - \#n+i), and if so, fragments \#n+1, .., \#n+i must |
| * be empty. When no more data is available, this function should be called |
| * with NULL as data and 0 as data_sz. The memory passed to this function |
| * must be available until the frame has been decoded. |
| * |
| * \param[in] ctx Pointer to this instance's context |
| * \param[in] data Pointer to this block of new coded data. If |
| * NULL, a AOM_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. |
| * |
| * \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, |
| unsigned int 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); |
| |
| /*!\defgroup cap_put_frame Frame-Based Decoding Functions |
| * |
| * The following functions are required to be implemented for all decoders |
| * that advertise the AOM_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 AOM_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 (*aom_codec_put_frame_cb_fn_t)(void *user_priv, |
| const aom_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 #AOM_CODEC_OK |
| * Callback successfully registered. |
| * \retval #AOM_CODEC_ERROR |
| * Decoder context not initialized, or algorithm not capable of |
| * posting slice completion. |
| */ |
| aom_codec_err_t aom_codec_register_put_frame_cb(aom_codec_ctx_t *ctx, |
| aom_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 AOM_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 AOM_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 (*aom_codec_put_slice_cb_fn_t)(void *user_priv, |
| const aom_image_t *img, |
| const aom_image_rect_t *valid, |
| const aom_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 #AOM_CODEC_OK |
| * Callback successfully registered. |
| * \retval #AOM_CODEC_ERROR |
| * Decoder context not initialized, or algorithm not capable of |
| * posting slice completion. |
| */ |
| aom_codec_err_t aom_codec_register_put_slice_cb(aom_codec_ctx_t *ctx, |
| aom_codec_put_slice_cb_fn_t cb, |
| void *user_priv); |
| |
| /*!@} - end defgroup cap_put_slice*/ |
| |
| /*!\defgroup cap_external_frame_buffer External Frame Buffer Functions |
| * |
| * The following section 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_ERROR. |
| * |
| * \note |
| * Currently this only works with AV1. |
| * @{ |
| */ |
| |
| /*!\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, or 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_DECODER_H_ |
