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1 /*
2  *  Copyright (c) 2014 The WebM project authors. All Rights Reserved.
3  *
4  *  Use of this source code is governed by a BSD-style license
5  *  that can be found in the LICENSE file in the root of the source
6  *  tree. An additional intellectual property rights grant can be found
7  *  in the file PATENTS.  All contributing project authors may
8  *  be found in the AUTHORS file in the root of the source tree.
9  */
10 
11 #ifndef VPX_VPX_VPX_FRAME_BUFFER_H_
12 #define VPX_VPX_VPX_FRAME_BUFFER_H_
13 
14 /*!\file
15  * \brief Describes the decoder external frame buffer interface.
16  */
17 
18 #ifdef __cplusplus
19 extern "C" {
20 #endif
21 
22 #include "./vpx_integer.h"
23 
24 /*!\brief The maximum number of work buffers used by libvpx.
25  *  Support maximum 4 threads to decode video in parallel.
26  *  Each thread will use one work buffer.
27  * TODO(hkuang): Add support to set number of worker threads dynamically.
28  */
29 #define VPX_MAXIMUM_WORK_BUFFERS 8
30 
31 /*!\brief The maximum number of reference buffers that a VP9 encoder may use.
32  */
33 #define VP9_MAXIMUM_REF_BUFFERS 8
34 
35 /*!\brief External frame buffer
36  *
37  * This structure holds allocated frame buffers used by the decoder.
38  */
39 typedef struct vpx_codec_frame_buffer {
40   uint8_t *data; /**< Pointer to the data buffer */
41   size_t size;   /**< Size of data in bytes */
42   void *priv;    /**< Frame's private data */
43 } vpx_codec_frame_buffer_t;
44 
45 /*!\brief get frame buffer callback prototype
46  *
47  * This callback is invoked by the decoder to retrieve data for the frame
48  * buffer in order for the decode call to complete. The callback must
49  * allocate at least min_size in bytes and assign it to fb->data. The callback
50  * must zero out all the data allocated. Then the callback must set fb->size
51  * to the allocated size. The application does not need to align the allocated
52  * data. The callback is triggered when the decoder needs a frame buffer to
53  * decode a compressed image into. This function may be called more than once
54  * for every call to vpx_codec_decode. The application may set fb->priv to
55  * some data which will be passed back in the vpx_image_t and the release
56  * function call. |fb| is guaranteed to not be NULL. On success the callback
57  * must return 0. Any failure the callback must return a value less than 0.
58  *
59  * \param[in] priv         Callback's private data
60  * \param[in] min_size     Size in bytes needed by the buffer
61  * \param[in,out] fb       Pointer to vpx_codec_frame_buffer_t
62  */
63 typedef int (*vpx_get_frame_buffer_cb_fn_t)(void *priv, size_t min_size,
64                                             vpx_codec_frame_buffer_t *fb);
65 
66 /*!\brief release frame buffer callback prototype
67  *
68  * This callback is invoked by the decoder when the frame buffer is not
69  * referenced by any other buffers. |fb| is guaranteed to not be NULL. On
70  * success the callback must return 0. Any failure the callback must return
71  * a value less than 0.
72  *
73  * \param[in] priv         Callback's private data
74  * \param[in] fb           Pointer to vpx_codec_frame_buffer_t
75  */
76 typedef int (*vpx_release_frame_buffer_cb_fn_t)(void *priv,
77                                                 vpx_codec_frame_buffer_t *fb);
78 
79 #ifdef __cplusplus
80 }  // extern "C"
81 #endif
82 
83 #endif  // VPX_VPX_VPX_FRAME_BUFFER_H_
84