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| author | manuel <manuel@mausz.at> | 2020-10-19 00:52:24 +0200 |
|---|---|---|
| committer | manuel <manuel@mausz.at> | 2020-10-19 00:52:24 +0200 |
| commit | be933ef2241d79558f91796cc5b3a161f72ebf9c (patch) | |
| tree | fe3ab2f130e20c99001f2d7a81d610c78c96a3f4 /xbmc/utils/IBufferObject.h | |
| parent | 5f8335c1e49ce108ef3481863833c98efa00411b (diff) | |
| download | kodi-pvr-build-be933ef2241d79558f91796cc5b3a161f72ebf9c.tar.gz kodi-pvr-build-be933ef2241d79558f91796cc5b3a161f72ebf9c.tar.bz2 kodi-pvr-build-be933ef2241d79558f91796cc5b3a161f72ebf9c.zip | |
sync with upstream
Diffstat (limited to 'xbmc/utils/IBufferObject.h')
| -rw-r--r-- | xbmc/utils/IBufferObject.h | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/xbmc/utils/IBufferObject.h b/xbmc/utils/IBufferObject.h new file mode 100644 index 0000000..4588aff --- /dev/null +++ b/xbmc/utils/IBufferObject.h | |||
| @@ -0,0 +1,131 @@ | |||
| 1 | /* | ||
| 2 | * Copyright (C) 2017-2018 Team Kodi | ||
| 3 | * This file is part of Kodi - https://kodi.tv | ||
| 4 | * | ||
| 5 | * SPDX-License-Identifier: GPL-2.0-or-later | ||
| 6 | * See LICENSES/README.md for more information. | ||
| 7 | */ | ||
| 8 | |||
| 9 | #pragma once | ||
| 10 | |||
| 11 | #include <stdint.h> | ||
| 12 | #include <string> | ||
| 13 | |||
| 14 | /** | ||
| 15 | * @brief Interface to describe CBufferObjects. | ||
| 16 | * | ||
| 17 | * BufferObjects are used to abstract various memory types and present them | ||
| 18 | * with a generic interface. Typically on a posix system exists the concept | ||
| 19 | * of Direct Memory Access (DMA) which allows various systems to interact | ||
| 20 | * with a memory location directly without having to copy the data into | ||
| 21 | * userspace (ie. from kernel space). These DMA buffers are presented as | ||
| 22 | * file descriptors (fds) which can be passed around to gain access to | ||
| 23 | * the buffers memory location. | ||
| 24 | * | ||
| 25 | * In order to write to these buffer types typically the memory location has | ||
| 26 | * to be mapped into userspace via a call to mmap (or similar). This presents | ||
| 27 | * userspace with a memory location that can be initially written to (ie. by | ||
| 28 | * using memcpy or similar). Depending on the underlying implementation a | ||
| 29 | * stride might be specified if the memory type requires padding to a certain | ||
| 30 | * size (such as page size). The stride must be used when copying into the buffer. | ||
| 31 | * | ||
| 32 | * Some memory implementation may provide special memory layouts in which case | ||
| 33 | * modifiers are provided that describe tiling or compression. This should be | ||
| 34 | * transparent to the caller as the data copied into a BufferObject will likely | ||
| 35 | * be linear. The modifier will be needed when presenting the buffer via DRM or | ||
| 36 | * EGL even if it is linear. | ||
| 37 | * | ||
| 38 | */ | ||
| 39 | class IBufferObject | ||
| 40 | { | ||
| 41 | public: | ||
| 42 | virtual ~IBufferObject() = default; | ||
| 43 | |||
| 44 | /** | ||
| 45 | * @brief Create a BufferObject based on the format, width, and height of the desired buffer | ||
| 46 | * | ||
| 47 | * @param format framebuffer pixel formats are described using the fourcc codes defined in | ||
| 48 | * https://github.com/torvalds/linux/blob/master/include/uapi/drm/drm_fourcc.h | ||
| 49 | * @param width width of the requested buffer. | ||
| 50 | * @param height height of the requested buffer. | ||
| 51 | * @return true BufferObject creation was successful. | ||
| 52 | * @return false BufferObject creation was unsuccessful. | ||
| 53 | */ | ||
| 54 | virtual bool CreateBufferObject(uint32_t format, uint32_t width, uint32_t height) = 0; | ||
| 55 | |||
| 56 | /** | ||
| 57 | * @brief Create a BufferObject based only on the size of the desired buffer. Not all | ||
| 58 | * CBufferObject implementations may support this. This method is required for | ||
| 59 | * use with the CAddonVideoCodec as it only knows the decoded buffer size. | ||
| 60 | * | ||
| 61 | * @param size of the requested buffer. | ||
| 62 | * @return true BufferObject creation was successful. | ||
| 63 | * @return false BufferObject creation was unsuccessful. | ||
| 64 | */ | ||
| 65 | virtual bool CreateBufferObject(uint64_t size) = 0; | ||
| 66 | |||
| 67 | /** | ||
| 68 | * @brief Destroy a BufferObject. | ||
| 69 | * | ||
| 70 | */ | ||
| 71 | virtual void DestroyBufferObject() = 0; | ||
| 72 | |||
| 73 | /** | ||
| 74 | * @brief Get the Memory location of the BufferObject. This method needs to be | ||
| 75 | * called to be able to copy data into the BufferObject. | ||
| 76 | * | ||
| 77 | * @return uint8_t* pointer to the memory location of the BufferObject. | ||
| 78 | */ | ||
| 79 | virtual uint8_t *GetMemory() = 0; | ||
| 80 | |||
| 81 | /** | ||
| 82 | * @brief Release the mapped memory of the BufferObject. After calling this the memory | ||
| 83 | * location pointed to by GetMemory() will be invalid. | ||
| 84 | * | ||
| 85 | */ | ||
| 86 | virtual void ReleaseMemory() = 0; | ||
| 87 | |||
| 88 | /** | ||
| 89 | * @brief Get the File Descriptor of the BufferObject. The fd is guaranteed to be | ||
| 90 | * available after calling CreateBufferObject(). | ||
| 91 | * | ||
| 92 | * @return int fd for the BufferObject. Invalid if -1. | ||
| 93 | */ | ||
| 94 | virtual int GetFd() = 0; | ||
| 95 | |||
| 96 | /** | ||
| 97 | * @brief Get the Stride of the BufferObject. The stride is guaranteed to be | ||
| 98 | * available after calling GetMemory(). | ||
| 99 | * | ||
| 100 | * @return uint32_t stride of the BufferObject. | ||
| 101 | */ | ||
| 102 | virtual uint32_t GetStride() = 0; | ||
| 103 | |||
| 104 | /** | ||
| 105 | * @brief Get the Modifier of the BufferObject. Format Modifiers further describe | ||
| 106 | * the buffer's format such as for tiling or compression. | ||
| 107 | * see https://github.com/torvalds/linux/blob/master/include/uapi/drm/drm_fourcc.h | ||
| 108 | * | ||
| 109 | * @return uint64_t modifier of the BufferObject. 0 means the layout is linear (default). | ||
| 110 | */ | ||
| 111 | virtual uint64_t GetModifier() = 0; | ||
| 112 | |||
| 113 | /** | ||
| 114 | * @brief Must be called before reading/writing data to the BufferObject. | ||
| 115 | * | ||
| 116 | */ | ||
| 117 | virtual void SyncStart() = 0; | ||
| 118 | |||
| 119 | /** | ||
| 120 | * @brief Must be called after reading/writing data to the BufferObject. | ||
| 121 | * | ||
| 122 | */ | ||
| 123 | virtual void SyncEnd() = 0; | ||
| 124 | |||
| 125 | /** | ||
| 126 | * @brief Get the Name of the BufferObject type in use | ||
| 127 | * | ||
| 128 | * @return std::string name of the BufferObject type in use | ||
| 129 | */ | ||
| 130 | virtual std::string GetName() const = 0; | ||
| 131 | }; | ||
