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#! /usr/bin/env python3
#
# GlSurface example code for VLC Python bindings
# Copyright (C) 2020 Daniël van Adrichem <daniel5gh@spiet.nl>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
#
"""VLC GlSurface example
"""
import time
import ctypes
from threading import Lock
import numpy as np
from OpenGL.GL import (GL_TEXTURE_2D, glTexSubImage2D, glTexImage2D,
GL_BGR, GL_RGB,
GL_UNSIGNED_BYTE)
import vlc
class Surface(object):
"""A lockable image buffer
"""
def __init__(self, w, h):
self._width = w
self._height = h
# size in bytes when RV32 *4 or RV24 * 3
self._row_size = self._width * 3
self._buf_size = self._height * self._row_size
# allocate buffer
self._buf1 = np.zeros(self._buf_size, dtype=np.ubyte)
# get pointer to buffer
self._buf_p = self._buf1.ctypes.data_as(ctypes.c_void_p)
self._lock = Lock()
def update_gl(self):
# with self._lock:
glTexSubImage2D(GL_TEXTURE_2D,
0, 0, 0,
self._width,
self._height,
GL_BGR,
GL_UNSIGNED_BYTE,
self._buf1)
def create_texture_gl(self):
glTexImage2D(GL_TEXTURE_2D,
0,
GL_RGB,
self._width, # width
self._height, # height
0,
GL_BGR,
GL_UNSIGNED_BYTE,
None)
@property
def width(self):
return self._width
@property
def height(self):
return self._height
@property
def row_size(self):
return self._row_size
@property
def buf(self):
return self._buf1
@property
def buf_pointer(self):
return self._buf_p
def lock(self):
self._lock.acquire()
def unlock(self):
self._lock.release()
def __enter__(self, *args):
return self._lock.__enter__(*args)
def __exit__(self, *args):
return self._lock.__exit__(*args)
def get_libvlc_lock_callback(self):
@vlc.VideoLockCb
def _cb(opaque, planes):
self._lock.acquire()
planes[0] = self._buf_p
return _cb
def get_libvlc_unlock_callback(self):
@vlc.VideoUnlockCb
def _cb(opaque, picta, planes):
self._lock.release()
return _cb
if __name__ == '__main__':
import sys
player = vlc.MediaPlayer(sys.argv[1])
# play and stop so video_get_size gets a correct value
# setting all callbacks to None prevents a window being created on play
player.video_set_callbacks(None, None, None, None)
# play and stop so video_get_size gets a correct value
player.play()
time.sleep(1)
player.stop()
w, h = player.video_get_size()
surface = Surface(w, h)
# need to keep a reference to the CFUNCTYPEs or else it will get GCed
_lock_cb = surface.get_libvlc_lock_callback()
_unlock_cb = surface.get_libvlc_unlock_callback()
player.video_set_callbacks(_lock_cb, _unlock_cb, None, None)
player.video_set_format(
"RV24",
surface.width,
surface.height,
surface.row_size)
# this starts populating the surface's buf with pixels, from another thread
player.play()
# in main thread, where gl context is current:
# FIXME: add some code to embed the surface + a mainloop
# v.surface.update_gl()
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