def _callback_write(self, buf):
"""
Performs output writing on behalf of the encoder callback function;
return value determines whether writing has completed.
"""
if buf[0].length:
mmal_check(mmal.mmal_buffer_header_mem_lock(buf), prefix="Unable to lock buffer header memory")
try:
with self.lock:
if self.output:
written = self.output.write(ct.string_at(buf[0].data, buf[0].length))
# Ignore None return value; most Python 2 streams have
# no return value for write()
if (written is not None) and (written != buf[0].length):
raise PiCameraError("Unable to write buffer to file - aborting")
finally:
mmal.mmal_buffer_header_mem_unlock(buf)
return bool(buf[0].flags & mmal.MMAL_BUFFER_HEADER_FLAG_EOS)
def _callback_write(self, buf):
"""
Performs output writing on behalf of the encoder callback function;
return value determines whether writing has completed.
"""
if buf[0].length:
mmal_check(
mmal.mmal_buffer_header_mem_lock(buf),
prefix="Unable to lock buffer header memory")
try:
with self.lock:
if self.output and self.output.write(
ct.string_at(buf[0].data, buf[0].length)) != buf[0].length:
raise PiCameraError(
"Unable to write buffer to file - aborting")
finally:
mmal.mmal_buffer_header_mem_unlock(buf)
return False
def _callback_write(self, buf):
# Overridden to strip alpha bytes when necessary, and manually
# calculate the frame end
if buf[0].length and self._image_size:
mmal_check(mmal.mmal_buffer_header_mem_lock(buf), prefix="Unable to lock buffer header memory")
try:
s = ct.string_at(buf[0].data, buf[0].length)
if self._strip_alpha:
s = b"".join(s[i : i + 3] for i in range(0, len(s), 4))
with self.lock:
if self.output:
written = self.output.write(s)
# Ignore None return value; most Python 2 streams have
# no return value for write()
if (written is not None) and (written != len(s)):
raise PiCameraError("Unable to write buffer to file - aborting")
self._image_size -= len(s)
assert self._image_size >= 0
finally:
mmal.mmal_buffer_header_mem_unlock(buf)
return self._image_size <= 0
def _callback_write(self, buf):
"""
Performs output writing on behalf of the encoder callback function;
return value determines whether writing has completed.
"""
if buf[0].length:
mmal_check(mmal.mmal_buffer_header_mem_lock(buf),
prefix="Unable to lock buffer header memory")
try:
with self.lock:
if self.output:
written = self.output.write(
ct.string_at(buf[0].data, buf[0].length))
# Ignore None return value; most Python 2 streams have
# no return value for write()
if (written
is not None) and (written != buf[0].length):
raise PiCameraError(
"Unable to write buffer to file - aborting")
finally:
mmal.mmal_buffer_header_mem_unlock(buf)
return bool(buf[0].flags & mmal.MMAL_BUFFER_HEADER_FLAG_EOS)
def _callback_write(self, buf):
# Overridden to strip alpha bytes when necessary, and manually
# calculate the frame end
if buf[0].length and self._image_size:
mmal_check(mmal.mmal_buffer_header_mem_lock(buf),
prefix="Unable to lock buffer header memory")
try:
s = ct.string_at(buf[0].data, buf[0].length)
if self._strip_alpha:
s = b''.join(s[i:i + 3] for i in range(0, len(s), 4))
with self.lock:
if self.output:
written = self.output.write(s)
# Ignore None return value; most Python 2 streams have
# no return value for write()
if (written is not None) and (written != len(s)):
raise PiCameraError(
"Unable to write buffer to file - aborting")
self._image_size -= len(s)
assert self._image_size >= 0
finally:
mmal.mmal_buffer_header_mem_unlock(buf)
return self._image_size <= 0
