[PATCH v10 0/7] Add VirtualPipelineHandler

[Harvey Yang]

Hi all,

This series adds virtual pipeline handler, which doesn't depend on any
hardware, like camera sensor or ISP. Currently the configuration
supports test patterns and images.

It passed the gitlab pipeline:
https://gitlab.freedesktop.org/chenghaoyang/libcamera/-/pipelines/1260567

I failed to pass multi_stream_test when trying to enable multiple
streams though. Please give me some hints what it tests and what I
missed:
```
[295:43:43.910237144] [1441841]  INFO IPAManager ipa_manager.cpp:137 libcamera is not installed. Adding '/usr/local/google/home/chenghaoyang/Workspace/libca
mera/build/src/ipa' to the IPA search path
[295:43:43.914030564] [1441841]  INFO Camera camera_manager.cpp:325 libcamera v0.3.1+79-8ca4f033-dirty (2024-08-29T19:18:51UTC)
[295:43:43.915493754] [1441844] ERROR DmaBufAllocator dma_buf_allocator.cpp:120 Could not open any dma-buf provider
[295:43:43.919118835] [1441841]  INFO IPAManager ipa_manager.cpp:137 libcamera is not installed. Adding '/usr/local/google/home/chenghaoyang/Workspace/libca
mera/build/src/ipa' to the IPA search path
[295:43:43.922245825] [1441841]  INFO Camera camera_manager.cpp:325 libcamera v0.3.1+79-8ca4f033-dirty (2024-08-29T19:18:51UTC)
[295:43:43.922820175] [1441846] ERROR DmaBufAllocator dma_buf_allocator.cpp:120 Could not open any dma-buf provider
Unable to set the pipeline to the playing state.
```

Gitlab pipeline failure:
https://gitlab.freedesktop.org/chenghaoyang/libcamera/-/pipelines/1260412


Update in v10:
Apply fixes according to Jacopo's and Barnabás' comments.
- Split test_pattern and path fields in the yaml format.
- Let FrameGenerators control frameCount_.
- Fixed match() returning values.

Update in v9: Allocate contiguous memory for planes in the same
FrameBuffer.

BR,
Harvey

Harvey Yang (4):
  libcamera: add DmaBufAllocator::exportBuffers()
  libcamera: Remove PipelineHandler Fatal check of non-empty
    MediaDevices
  libcamera: virtual: Add VirtualPipelineHandler
  libcamera: software_isp: Refactor SoftwareIsp to use
    DmaBufAllocator::exportBuffers

Konami Shu (3):
  libcamera: pipeline: Add test pattern for VirtualPipelineHandler
  libcamera: virtual: Read config and register cameras based on the
    config
  libcamera: virtual: Add ImageFrameGenerator

 .../libcamera/internal/dma_buf_allocator.h    |  12 +
 meson.build                                   |   1 +
 meson_options.txt                             |   3 +-
 src/android/meson.build                       |  19 --
 src/libcamera/dma_buf_allocator.cpp           |  55 +++
 src/libcamera/pipeline/virtual/README.md      |  50 +++
 .../pipeline/virtual/data/virtual.yaml        |  37 ++
 .../pipeline/virtual/frame_generator.h        |  28 ++
 .../virtual/image_frame_generator.cpp         | 179 ++++++++++
 .../pipeline/virtual/image_frame_generator.h  |  54 +++
 src/libcamera/pipeline/virtual/meson.build    |  13 +
 src/libcamera/pipeline/virtual/parser.cpp     | 251 ++++++++++++++
 src/libcamera/pipeline/virtual/parser.h       |  44 +++
 .../virtual/test_pattern_generator.cpp        | 140 ++++++++
 .../pipeline/virtual/test_pattern_generator.h |  57 ++++
 src/libcamera/pipeline/virtual/utils.h        |  17 +
 src/libcamera/pipeline/virtual/virtual.cpp    | 317 ++++++++++++++++++
 src/libcamera/pipeline/virtual/virtual.h      | 107 ++++++
 src/libcamera/pipeline_handler.cpp            |  11 +-
 src/libcamera/software_isp/software_isp.cpp   |  20 +-
 src/meson.build                               |  19 ++
 21 files changed, 1392 insertions(+), 42 deletions(-)
 create mode 100644 src/libcamera/pipeline/virtual/README.md
 create mode 100644 src/libcamera/pipeline/virtual/data/virtual.yaml
 create mode 100644 src/libcamera/pipeline/virtual/frame_generator.h
 create mode 100644 src/libcamera/pipeline/virtual/image_frame_generator.cpp
 create mode 100644 src/libcamera/pipeline/virtual/image_frame_generator.h
 create mode 100644 src/libcamera/pipeline/virtual/meson.build
 create mode 100644 src/libcamera/pipeline/virtual/parser.cpp
 create mode 100644 src/libcamera/pipeline/virtual/parser.h
 create mode 100644 src/libcamera/pipeline/virtual/test_pattern_generator.cpp
 create mode 100644 src/libcamera/pipeline/virtual/test_pattern_generator.h
 create mode 100644 src/libcamera/pipeline/virtual/utils.h
 create mode 100644 src/libcamera/pipeline/virtual/virtual.cpp
 create mode 100644 src/libcamera/pipeline/virtual/virtual.h

-- 
2.46.0.469.g59c65b2a67-goog