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uvcxh264.py
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uvcxh264.py
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import uvcx, logging, ctypes
# H264 extension GUID a29e7641-de04-47e3-8b2b-f4341aff003b
UVC_H264_GUID = b'\x41\x76\x9e\xa2\x04\xde\xe3\x47\x8b\x2b\xf4\x34\x1a\xff\x00\x3b'
VIDEO_CONFIG_PROBE = 0x01
VIDEO_CONFIG_COMMIT = 0x02
RATE_CONTROL_MODE = 0x03
TEMPORAL_SCALE_MODE = 0x04
SPATIAL_SCALE_MODE = 0x05
SNR_SCALE_MODE = 0x06
LTR_BUFFER_SIZE_CONTROL = 0x07
LTR_PICTURE_CONTROL = 0x08
PICTURE_TYPE_CONTROL = 0x09
VERSION = 0x0A
ENCODER_RESET = 0x0B
FRAMERATE_CONFIG = 0x0C
VIDEO_ADVANCE_CONFIG = 0x0D
BITRATE_LAYERS = 0x0E
QP_STEPS_LAYERS = 0x0F
BMHINTS_NONE = 0x0000
BMHINTS_RESOLUTION = 0x0001
BMHINTS_PROFILE = 0x0002
BMHINTS_RATECONTROL = 0x0004
BMHINTS_USAGE = 0x0008
BMHINTS_SLICEMODE = 0x0010
BMHINTS_SLICEUNITS = 0x0020
BMHINTS_MVCVIEW = 0x0040
BMHINTS_TEMPORAL = 0x0080
BMHINTS_SNR = 0x0100
BMHINTS_SPATIAL = 0x0200
BMHINTS_SPATIAL_RATIO = 0x0400
BMHINTS_FRAME_INTERVAL = 0x0800
BMHINTS_LEAKY_BKT_SIZE = 0x1000
BMHINTS_BITRATE = 0x2000
BMHINTS_ENTROPY = 0x4000
BMHINTS_IFRAMEPERIOD = 0x8000
PROFILE_CONSTRAINED_BASELINE = 0x4240
PROFILE_BASELINE = 0x4200
PROFILE_MAIN = 0x4D00
PROFILE_HIGH = 0x6400
RATECONTROL_CBR = 0x01
RATECONTROL_VBR = 0x02
RATECONTROL_CONST_QP = 0x03
QP_STEPS_I_FRAME_TYPE = 0x01
QP_STEPS_P_FRAME_TYPE = 0x02
QP_STEPS_B_FRAME_TYPE = 0x04
QP_STEPS_ALL_FRAME_TYPES = 0x07
SLICE_MODE_OFF = 0x00
SLICE_MODE_BITS_PER_SLICE = 0x01
SLICE_MODE_MBS_PER_SLICE = 0x02
SLICE_MODE_SLICES_PER_FRAME = 0x03
ENTROPY_CAVLC = 0x00
ENTROPY_CABAC = 0x01
USAGE_REALTIME = 0x01
USAGE_BROADCAST = 0x02
USAGE_STORAGE = 0x03
STREAM_MUX_DISABLED = 0x00
STREAM_MUX_ENABLED = 0x01
STREAM_MUX_H264 = 0x02
STREAM_MUX_YUYV = 0x04
STREAM_MUX_NV12 = 0x08
STREAM_MUX_CONTAINER_MJPEG = 0x40
STREAM_MUX_H264_ENABLED = STREAM_MUX_H264 | STREAM_MUX_ENABLED
STREAM_MUX_YUYV_ENABLED = STREAM_MUX_YUYV | STREAM_MUX_ENABLED
STREAM_MUX_NV12_ENABLED = STREAM_MUX_NV12 | STREAM_MUX_ENABLED
PICTURE_TYPE_IFRAME = 0x0000 # Generate an IFRAME
PICTURE_TYPE_IDR = 0x0001 # Generate an IDR
PICTURE_TYPE_IDR_FULL = 0x0002 # Generate an IDR frame with new SPS and PPS
class picture_type_control_t(ctypes.Structure):
_fields_ = [
('wLayerID', ctypes.c_uint16),
('wPicType', ctypes.c_uint16),
]
class version_t(ctypes.Structure):
_fields_ = [
('wVersion', ctypes.c_uint16),
]
class qp_steps_layers_t(ctypes.Structure):
_fields_ = [
('wLayerID', ctypes.c_uint16),
('bFrameType', ctypes.c_uint8),
('bMinQp', ctypes.c_uint8),
('bMaxQp', ctypes.c_uint8),
]
class video_config_probe_commit(ctypes.Structure):
_fields_ = [
('dwFrameInterval', ctypes.c_uint32),
('dwBitRate', ctypes.c_uint32),
('bmHints', ctypes.c_uint16),
('wConfigurationIndex', ctypes.c_uint16),
('wWidth', ctypes.c_uint16),
('wHeight', ctypes.c_uint16),
('wSliceUnits', ctypes.c_uint16),
('wSliceMode', ctypes.c_uint16),
('wProfile', ctypes.c_uint16),
('wIFramePeriod', ctypes.c_uint16),
('wEstimatedVideoDelay', ctypes.c_uint16),
('wEstimatedMaxConfigDelay', ctypes.c_uint16),
('bUsageType', ctypes.c_uint8),
('bRateControlMode', ctypes.c_uint8),
('bTemporalScaleMode', ctypes.c_uint8),
('bSpatialScaleMode', ctypes.c_uint8),
('bSNRScaleMode', ctypes.c_uint8),
('bStreamMuxOption', ctypes.c_uint8),
('bStreamFormat', ctypes.c_uint8),
('bEntropyCABAC', ctypes.c_uint8),
('bTimestamp', ctypes.c_uint8),
('bNumOfReorderFrames', ctypes.c_uint8),
('bPreviewFlipped', ctypes.c_uint8),
('bView', ctypes.c_uint8),
('bReserved1', ctypes.c_uint8),
('bReserved2', ctypes.c_uint8),
('bStreamID', ctypes.c_uint8),
('bSpatialLayerRatio', ctypes.c_uint8),
('wLeakyBucketSize', ctypes.c_uint16),
]
def request_h264_frame_type(fd, unit_id, type):
picture_type_req = picture_type_control_t()
picture_type_req.wLayerID = 0
picture_type_req.wPicType = type
uvcx.query_xu_control(fd, unit_id, PICTURE_TYPE_CONTROL, uvcx.UVC_SET_CUR, picture_type_req)
def request_h264_idr(fd, unit_id):
request_h264_frame_type(fd, unit_id, PICTURE_TYPE_IDR)
def get_h264_default_config(fd, unit_id):
config = video_config_probe_commit()
uvcx.query_xu_control(fd, unit_id, VIDEO_CONFIG_PROBE, uvcx.UVC_GET_DEF, config)
return config
def get_h264_minimum_config(fd, unit_id):
config = video_config_probe_commit()
uvcx.query_xu_control(fd, unit_id, VIDEO_CONFIG_PROBE, uvcx.UVC_GET_MIN, config)
return config
def get_h264_maximum_config(fd, unit_id):
config = video_config_probe_commit()
uvcx.query_xu_control(fd, unit_id, VIDEO_CONFIG_PROBE, uvcx.UVC_GET_MAX, config)
return config
def get_h264_current_config(fd, unit_id):
config = video_config_probe_commit()
uvcx.query_xu_control(fd, unit_id, VIDEO_CONFIG_PROBE, uvcx.UVC_GET_CUR, config)
return config
def get_h264_resolution_config(fd, unit_id):
config = video_config_probe_commit()
uvcx.query_xu_control(fd, unit_id, VIDEO_CONFIG_PROBE, uvcx.UVC_GET_RES, config)
return config
def set_h264_config(fd, unit_id, config):
uvcx.query_xu_control(fd, unit_id, VIDEO_CONFIG_COMMIT, uvcx.UVC_SET_CUR, config)
def get_h264_version(fd, unit_id):
version = version_t()
uvcx.query_xu_control(fd, unit_id, VERSION, uvcx.UVC_GET_CUR, version)
return version.wVersion
class H264Ctrls:
def __init__(self, device, fd):
self.device = device
self.fd = fd
self.unit_id = uvcx.find_unit_id_in_sysfs(device, UVC_H264_GUID)
self.get_device_controls()
def supported(self):
return self.unit_id != 0
def h264_muxing_supported(self):
return self.supported() and (self.maximum_config.bStreamMuxOption & STREAM_MUX_H264) > 0
def get_device_controls(self):
if not self.supported():
self.ctrls = []
return
self.default_config = get_h264_default_config(self.fd, self.unit_id)
self.minimum_config = get_h264_minimum_config(self.fd, self.unit_id)
self.maximum_config = get_h264_maximum_config(self.fd, self.unit_id)
self.current_config = get_h264_current_config(self.fd, self.unit_id)
self.ctrls = [
Ctrl(
'uvcx_h264_stream_mux',
BMHINTS_NONE,
'bStreamMuxOption',
{
STREAM_MUX_DISABLED: 'None',
STREAM_MUX_H264_ENABLED: 'H264',
}
),
Ctrl(
'uvcx_h264_width',
BMHINTS_RESOLUTION,
'wWidth',
),
Ctrl(
'uvcx_h264_height',
BMHINTS_RESOLUTION,
'wHeight',
),
Ctrl(
'uvcx_h264_frame_interval',
BMHINTS_FRAME_INTERVAL,
'dwFrameInterval',
),
Ctrl(
'uvcx_h264_bitrate',
BMHINTS_BITRATE,
'dwBitRate',
),
Ctrl(
'uvcx_h264_rate_control_mode',
BMHINTS_RATECONTROL,
'bRateControlMode',
{
RATECONTROL_CBR: 'CBR',
RATECONTROL_VBR: 'VBR',
RATECONTROL_CONST_QP: 'Const QP',
}
),
Ctrl(
'uvcx_h264_profile',
BMHINTS_PROFILE,
'wProfile',
{
PROFILE_CONSTRAINED_BASELINE: 'Constrained',
PROFILE_BASELINE: 'Baseline',
PROFILE_MAIN: 'Main',
PROFILE_HIGH: 'High',
}
),
Ctrl(
'uvcx_h264_i_frame_period',
BMHINTS_IFRAMEPERIOD,
'wIFramePeriod',
),
Ctrl(
'uvcx_h264_slice_mode',
BMHINTS_SLICEMODE,
'wSliceMode',
{
SLICE_MODE_OFF: 'Off',
SLICE_MODE_BITS_PER_SLICE: 'BitsPerSlice',
SLICE_MODE_MBS_PER_SLICE: 'MBsPerSlice',
SLICE_MODE_SLICES_PER_FRAME: 'SlicesPerFrame',
}
),
Ctrl(
'uvcx_h264_slice_units',
BMHINTS_SLICEUNITS,
'wSliceUnits',
),
Ctrl(
'uvcx_h264_entropy',
BMHINTS_ENTROPY,
'bEntropyCABAC',
{
ENTROPY_CAVLC: 'CAVLC',
ENTROPY_CABAC: 'CABAC',
}
),
Ctrl(
'uvcx_h264_usage',
BMHINTS_USAGE,
'bUsageType',
{
USAGE_REALTIME: 'Realtime',
USAGE_BROADCAST: 'Broadcast',
USAGE_STORAGE: 'Storage',
}
),
Ctrl(
'uvcx_h264_leaky_bucket_size',
BMHINTS_LEAKY_BKT_SIZE,
'wLeakyBucketSize',
),
]
def print_ctrls(self):
for c in self.ctrls:
minimum = getattr(self.minimum_config, c.sname)
maximum = getattr(self.maximum_config, c.sname)
default = getattr(self.default_config, c.sname)
value = getattr(self.current_config, c.sname)
print(c.name, end = ' = ')
if not c.menu:
print('%a\t(' % value, 'default:', default, 'min:', minimum, 'max:', maximum, end = ')\n')
else:
valmenu = c.menu.get(value)
defmenu = c.menu.get(default)
print(f'{valmenu if valmenu else value}\t(', end = ' ')
if defmenu:
print(f'default: {defmenu}', end = ' ')
print('values:', end = ' ')
for k, v in c.menu.items():
print('%a' % v, end = ' ')
print(')')
def setup_ctrls(self, params):
if not self.supported():
return
for k, v in params.items():
if not k.startswith('uvcx_h264_'):
continue
ctrl = find_by_name(self.ctrls, k)
if ctrl == None:
logging.warning(f'H264Ctrls: can\'t find {k} control in {[c.name for c in self.ctrls]}')
continue
if ctrl.menu:
menukey = find_by_value(ctrl.menu, v)
if menukey == None:
logging.warning(f'H264Ctrls: can\'t find {v} in {list(ctrl.menu.values())}')
continue
setattr(self.current_config, ctrl.sname, menukey)
else:
setattr(self.current_config, ctrl.sname, int(v))
self.current_config.bmHints |= ctrl.hint
set_h264_config(self.fd, self.unit_id, self.current_config)
current = get_h264_current_config(self.fd, self.unit_id)
for k, v in params.items():
if not k.startswith('uvcx_h264_'):
continue
ctrl = find_by_name(self.ctrls, k)
if ctrl == None:
continue
desired_value = getattr(self.current_config, ctrl.sname)
current_value = getattr(current, ctrl.sname)
if ctrl.menu:
desired_value = ctrl.menu.get(desired_value, desired_value)
current_value = ctrl.menu.get(current_value, current_value)
if current_value != desired_value:
logging.warning(f'H264Ctrls: failed to set {k} to {desired_value}, current value {current_value}\n')
def refresh_ctrls(self):
if not self.supported():
return
set_h264_config(self.fd, self.unit_id, self.current_config)
def request_h264_idr(self):
request_h264_frame_type(self.fd, self.unit_id, PICTURE_TYPE_IDR)
class Ctrl:
def __init__(self, name, hint, sname, menu = None):
self.name = name
self.hint = hint
self.sname = sname
self.menu = menu
def find_by_name(ctrls, name):
for c in ctrls:
if name == c.name:
return c
return None
def find_by_value(menu, value):
for k, v in menu.items():
if v == value:
return k
return None