This series adds support for decoding multi-slice H264 frames along with support for V4L2_DEC_CMD_FLUSH and V4L2_BUF_FLAG_M2M_HOLD_CAPTURE_BUF. Code was tested by modified ffmpeg, which can be found here: https://github.com/jernejsk/FFmpeg, branch mainline-test It has to be configured with at least following options: --enable-v4l2-request --enable-libudev --enable-libdrm Samples used for testing: http://jernej.libreelec.tv/videos/h264/BA1_FT_C.mp4 http://jernej.libreelec.tv/videos/h264/h264.mp4 Command line used for testing: ffmpeg -hwaccel drm -hwaccel_device /dev/dri/card0 -i h264.mp4 -pix_fmt bgra -f fbdev /dev/fb0 Please note that V4L2_DEC_CMD_FLUSH was not tested because I'm not sure how. ffmpeg follows exactly which slice is last in frame and sets hold flag accordingly. Improper usage of hold flag would corrupt ffmpeg assumptions and it would probably crash. Any ideas how to test this are welcome! Thanks to Jonas for adjusting ffmpeg. Please let me know what you think. Best regards, Jernej Changes from v1: - added Rb tags - updated V4L2_DEC_CMD_FLUSH documentation - updated first slice detection in Cedrus - hold capture buffer flag is set according to source format - added v4l m2m stateless_(try_)decoder_cmd ioctl helpers Hans Verkuil (2): vb2: add V4L2_BUF_FLAG_M2M_HOLD_CAPTURE_BUF videodev2.h: add V4L2_DEC_CMD_FLUSH Jernej Skrabec (4): media: v4l2-mem2mem: add stateless_(try_)decoder_cmd ioctl helpers media: cedrus: Detect first slice of a frame media: cedrus: h264: Support multiple slices per frame media: cedrus: Add support for holding capture buffer Documentation/media/uapi/v4l/buffer.rst | 13 ++++++ .../media/uapi/v4l/vidioc-decoder-cmd.rst | 10 +++- .../media/uapi/v4l/vidioc-reqbufs.rst | 6 +++ .../media/videodev2.h.rst.exceptions | 1 + .../media/common/videobuf2/videobuf2-v4l2.c | 8 +++- drivers/media/v4l2-core/v4l2-mem2mem.c | 35 ++++++++++++++ drivers/staging/media/sunxi/cedrus/cedrus.h | 1 + .../staging/media/sunxi/cedrus/cedrus_dec.c | 11 +++++ .../staging/media/sunxi/cedrus/cedrus_h264.c | 11 ++++- .../staging/media/sunxi/cedrus/cedrus_hw.c | 8 ++-- .../staging/media/sunxi/cedrus/cedrus_video.c | 14 ++++++ include/media/v4l2-mem2mem.h | 46 +++++++++++++++++++ include/media/videobuf2-core.h | 3 ++ include/media/videobuf2-v4l2.h | 5 ++ include/uapi/linux/videodev2.h | 14 ++++-- 15 files changed, 175 insertions(+), 11 deletions(-) -- 2.23.0
