from __future__ import print_function
import argparse
import ctypes
import os
import sys
import pprint
import time

from qtproxy import Q
from glproxy import gl

import av

WIDTH = 960
HEIGHT = 540


class PlayerGLWidget(Q.GLWidget):

    def initializeGL(self):
        print('initialize GL')
        gl.clearColor(0, 0, 0, 0)

        gl.enable(gl.TEXTURE_2D)

        # gl.texEnv(gl.TEXTURE_ENV, gl.TEXTURE_ENV_MODE, gl.DECAL)
        self.tex_id = gl.genTextures(1)
        gl.bindTexture(gl.TEXTURE_2D, self.tex_id)
        gl.texParameter(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST)
        gl.texParameter(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST)

        print('texture id', self.tex_id)

    def setImage(self, w, h, img):
        gl.texImage2D(gl.TEXTURE_2D, 0, 3, w, h, 0, gl.RGB, gl.UNSIGNED_BYTE, img)

    def resizeGL(self, w, h):
        print('resize to', w, h)
        gl.viewport(0, 0, w, h)
        # gl.matrixMode(gl.PROJECTION)
        # gl.loadIdentity()
        # gl.ortho(0, w, 0, h, -10, 10)
        # gl.matrixMode(gl.MODELVIEW)

    def paintGL(self):
        # print 'paint!'
        gl.clear(gl.COLOR_BUFFER_BIT)
        with gl.begin('polygon'):
            gl.texCoord(0, 0); gl.vertex(-1, 1)
            gl.texCoord(1, 0); gl.vertex(1, 1)
            gl.texCoord(1, 1); gl.vertex(1, -1)
            gl.texCoord(0, 1); gl.vertex(-1, -1)



parser = argparse.ArgumentParser()
parser.add_argument('-f', '--format')
parser.add_argument('path')
args = parser.parse_args()


def _iter_images():
    video = av.open(args.path, format=args.format)
    stream = next(s for s in video.streams if s.type == b'video')
    for packet in video.demux(stream):
        for frame in packet.decode():
            yield frame.reformat(frame.width, frame.height, 'rgb24')

image_iter = _iter_images()

app = Q.Application([])

glwidget = PlayerGLWidget()
glwidget.setFixedWidth(WIDTH)
glwidget.setFixedHeight(HEIGHT)
glwidget.show()
glwidget.raise_()

start_time = 0
count = 0

timer = Q.Timer()
timer.setInterval(1000 / 30)
@timer.timeout.connect
def on_timeout(*args):

    global start_time, count
    start_time = start_time or time.time()

    frame = next(image_iter)
    ptr = ctypes.c_void_p(frame.planes[0].ptr)
    glwidget.setImage(frame.width, frame.height, ptr)
    glwidget.updateGL()

    count += 1
    elapsed = time.time() - start_time
    print(frame.pts, frame.dts, '%.2ffps' % (count / elapsed))

timer.start()

app.exec_()