aom_frame_buffer.h 3.23 KB
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/*
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 * Copyright (c) 2016, Alliance for Open Media. All rights reserved
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 *
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 * 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.
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 */

#ifndef VPX_VPX_FRAME_BUFFER_H_
#define VPX_VPX_FRAME_BUFFER_H_

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/*!\file
 * \brief Describes the decoder external frame buffer interface.
 */

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#ifdef __cplusplus
extern "C" {
#endif

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#include "./aom_integer.h"
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/*!\brief The maximum number of work buffers used by libaom.
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 *  Support maximum 4 threads to decode video in parallel.
 *  Each thread will use one work buffer.
 * TODO(hkuang): Add support to set number of worker threads dynamically.
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 */
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#define VPX_MAXIMUM_WORK_BUFFERS 8
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/*!\brief The maximum number of reference buffers that a VP9 encoder may use.
 */
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#define VPX_MAXIMUM_REF_BUFFERS 8
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/*!\brief External frame buffer
 *
 * This structure holds allocated frame buffers used by the decoder.
 */
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typedef struct aom_codec_frame_buffer {
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  uint8_t *data; /**< Pointer to the data buffer */
  size_t size;   /**< Size of data in bytes */
  void *priv;    /**< Frame's private data */
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} aom_codec_frame_buffer_t;
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/*!\brief get frame buffer callback prototype
 *
 * This callback is invoked by the decoder to retrieve data for the frame
 * buffer in order for the decode call to complete. The callback must
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 * allocate at least min_size in bytes and assign it to fb->data. The callback
 * must zero out all the data allocated. Then the callback must set fb->size
 * to the allocated size. The application does not need to align the allocated
 * data. The callback is triggered when the decoder needs a frame buffer to
 * decode a compressed image into. This function may be called more than once
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 * for every call to aom_codec_decode. The application may set fb->priv to
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 * some data which will be passed back in the ximage and the release function
 * call. |fb| is guaranteed to not be NULL. On success the callback must
 * return 0. Any failure the callback must return a value less than 0.
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 *
 * \param[in] priv         Callback's private data
 * \param[in] new_size     Size in bytes needed by the buffer
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 * \param[in,out] fb       Pointer to aom_codec_frame_buffer_t
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 */
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typedef int (*aom_get_frame_buffer_cb_fn_t)(void *priv, size_t min_size,
                                            aom_codec_frame_buffer_t *fb);
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/*!\brief release frame buffer callback prototype
 *
 * This callback is invoked by the decoder when the frame buffer is not
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 * referenced by any other buffers. |fb| is guaranteed to not be NULL. On
 * success the callback must return 0. Any failure the callback must return
 * a value less than 0.
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 *
 * \param[in] priv         Callback's private data
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 * \param[in] fb           Pointer to aom_codec_frame_buffer_t
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 */
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typedef int (*aom_release_frame_buffer_cb_fn_t)(void *priv,
                                                aom_codec_frame_buffer_t *fb);
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#ifdef __cplusplus
}  // extern "C"
#endif

#endif  // VPX_VPX_FRAME_BUFFER_H_