diff options
| -rw-r--r-- | include/libcamera/buffer.h | 1 | ||||
| -rw-r--r-- | src/libcamera/buffer.cpp | 68 |
2 files changed, 69 insertions, 0 deletions
diff --git a/include/libcamera/buffer.h b/include/libcamera/buffer.h index 8e5ec699..ef3a3b36 100644 --- a/include/libcamera/buffer.h +++ b/include/libcamera/buffer.h @@ -57,6 +57,7 @@ public: unsigned int cookie() const { return cookie_; } void setCookie(unsigned int cookie) { cookie_ = cookie; } + int copyFrom(const FrameBuffer *src); private: friend class Request; /* Needed to update request_. */ friend class V4L2VideoDevice; /* Needed to update metadata_. */ diff --git a/src/libcamera/buffer.cpp b/src/libcamera/buffer.cpp index 673a63d3..93057568 100644 --- a/src/libcamera/buffer.cpp +++ b/src/libcamera/buffer.cpp @@ -211,4 +211,72 @@ FrameBuffer::FrameBuffer(const std::vector<Plane> &planes, unsigned int cookie) * core never modifies the buffer cookie. */ +/** + * \brief Copy the contents from another buffer + * \param[in] src Buffer to copy + * + * Copy the buffer contents and metadata from \a src to this buffer. The + * destination FrameBuffer shall have the same number of planes as the source + * buffer, and each destination plane shall be larger than or equal to the + * corresponding source plane. + * + * The complete metadata of the source buffer is copied to the destination + * buffer. If an error occurs during the copy, the destination buffer's metadata + * status is set to FrameMetadata::FrameError, and other metadata fields are not + * modified. + * + * The operation is performed using memcpy() so is very slow, users needs to + * consider this before copying buffers. + * + * \return 0 on success or a negative error code otherwise + */ +int FrameBuffer::copyFrom(const FrameBuffer *src) +{ + if (planes_.size() != src->planes_.size()) { + LOG(Buffer, Error) << "Different number of planes"; + metadata_.status = FrameMetadata::FrameError; + return -EINVAL; + } + + for (unsigned int i = 0; i < planes_.size(); i++) { + if (planes_[i].length < src->planes_[i].length) { + LOG(Buffer, Error) << "Plane " << i << " is too small"; + metadata_.status = FrameMetadata::FrameError; + return -EINVAL; + } + } + + for (unsigned int i = 0; i < planes_.size(); i++) { + void *dstmem = mmap(nullptr, planes_[i].length, PROT_WRITE, + MAP_SHARED, planes_[i].fd.fd(), 0); + + if (dstmem == MAP_FAILED) { + LOG(Buffer, Error) + << "Failed to map destination plane " << i; + metadata_.status = FrameMetadata::FrameError; + return -EINVAL; + } + + void *srcmem = mmap(nullptr, src->planes_[i].length, PROT_READ, + MAP_SHARED, src->planes_[i].fd.fd(), 0); + + if (srcmem == MAP_FAILED) { + munmap(dstmem, planes_[i].length); + LOG(Buffer, Error) + << "Failed to map source plane " << i; + metadata_.status = FrameMetadata::FrameError; + return -EINVAL; + } + + memcpy(dstmem, srcmem, src->planes_[i].length); + + munmap(srcmem, src->planes_[i].length); + munmap(dstmem, planes_[i].length); + } + + metadata_ = src->metadata_; + + return 0; +} + } /* namespace libcamera */ |