/* *  Copyright (c) 2014 The WebM project authors. All Rights Reserved. * *  Use of this source code is governed by a BSD-style license *  that can be found in the LICENSE file in the root of the source *  tree. An additional intellectual property rights grant can be found *  in the file PATENTS.  All contributing project authors may *  be found in the AUTHORS file in the root of the source tree. */ #ifndef VPX_VPX_VPX_FRAME_BUFFER_H_#define VPX_VPX_VPX_FRAME_BUFFER_H_ /*!\file * \brief Describes the decoder external frame buffer interface. */ #ifdef __cplusplusextern "C" {#endif #include "./vpx_integer.h" /*!\brief The maximum number of work buffers used by libvpx. *  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. */#define VPX_MAXIMUM_WORK_BUFFERS 8 /*!\brief The maximum number of reference buffers that a VP9 encoder may use. */#define VP9_MAXIMUM_REF_BUFFERS 8 /*!\brief External frame buffer * * This structure holds allocated frame buffers used by the decoder. */typedef struct vpx_codec_frame_buffer {  uint8_t *data; /**< Pointer to the data buffer */  size_t size;   /**< Size of data in bytes */  void *priv;    /**< Frame's private data */} vpx_codec_frame_buffer_t; /*!\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 * 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 * for every call to vpx_codec_decode. The application may set fb->priv to * some data which will be passed back in the vpx_image_t 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. * * \param[in] priv         Callback's private data * \param[in] min_size     Size in bytes needed by the buffer * \param[in,out] fb       Pointer to vpx_codec_frame_buffer_t */typedef int (*vpx_get_frame_buffer_cb_fn_t)(void *priv, size_t min_size,                                            vpx_codec_frame_buffer_t *fb); /*!\brief release frame buffer callback prototype * * This callback is invoked by the decoder when the frame buffer is not * 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. * * \param[in] priv         Callback's private data * \param[in] fb           Pointer to vpx_codec_frame_buffer_t */typedef int (*vpx_release_frame_buffer_cb_fn_t)(void *priv,                                                vpx_codec_frame_buffer_t *fb); #ifdef __cplusplus}  // extern "C"#endif #endif  // VPX_VPX_VPX_FRAME_BUFFER_H_