Test the new mmal methods from picam

mmaltest.py

import io

from time import sleep

from picamera import mmal, mmalobj as mo, PiCameraPortDisabled


def main(output_filename):
    camera = mo.MMALCamera()
    preview = mo.MMALRenderer()
    encoder = mo.MMALVideoEncoder()
    target = mo.MMALPythonTarget(output_filename)

    # Configure camera output 0
    camera.outputs[0].framesize = (640, 480)
    camera.outputs[0].framerate = 24
    camera.outputs[0].commit()

    # Configure H.264 encoder
    encoder.outputs[0].format = mmal.MMAL_ENCODING_H264
    encoder.outputs[0].bitrate = 2000000
    encoder.outputs[0].commit()
    p = encoder.outputs[0].params[mmal.MMAL_PARAMETER_PROFILE]
    p.profile[0].profile = mmal.MMAL_VIDEO_PROFILE_H264_HIGH
    p.profile[0].level = mmal.MMAL_VIDEO_LEVEL_H264_41
    encoder.outputs[0].params[mmal.MMAL_PARAMETER_PROFILE] = p
    encoder.outputs[0].params[mmal.MMAL_PARAMETER_VIDEO_ENCODE_INLINE_HEADER] = True
    encoder.outputs[0].params[mmal.MMAL_PARAMETER_INTRAPERIOD] = 30
    encoder.outputs[0].params[mmal.MMAL_PARAMETER_VIDEO_ENCODE_INITIAL_QUANT] = 22
    encoder.outputs[0].params[mmal.MMAL_PARAMETER_VIDEO_ENCODE_MAX_QUANT] = 22
    encoder.outputs[0].params[mmal.MMAL_PARAMETER_VIDEO_ENCODE_MIN_QUANT] = 22

    # Connect everything up and enable everything (no need to enable capture on
    # camera port 0)
    preview.inputs[0].connect(camera.outputs[0])
    encoder.inputs[0].connect(camera.outputs[1])
    target.inputs[0].connect(encoder.outputs[0])

    target.connection.enable()
    encoder.connection.enable()
    preview.connection.enable()

    target.enable()
    encoder.enable()
    preview.enable()

    try:
        sleep(10)
    finally:
        # Disable everything and tear down the pipeline
        target.disable()
        encoder.disable()
        preview.disable()
        target.inputs[0].disconnect()
        encoder.inputs[0].disconnect()
        preview.inputs[0].disconnect()


if __name__ == '__main__':
    main('output.h264')