# People's Video Editor: high quality, GPU accelerated mp4 editor
# Copyright (C) 2025 Roz K <roz@rozk.net>
#
# This file is part of People's Video Editor.
#
# People's Video Editor 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 3 of the License,
# or (at your option) any later version.
#
# People's Video Editor 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 People's Video Editor.
# If not, see <https://www.gnu.org/licenses/>.

from pyav.demuxer import Demuxer
from pyav.decoder import Decoder

demuxer = Demuxer('test.mp4')

print(f"nb_streams  = {demuxer.nb_streams}")
print(f"video codec = {demuxer.video_stream.codec.name}")
print(f"audio codec = {demuxer.audio_stream.codec.name}")

video_decoder = Decoder(demuxer.video_stream)
audio_decoder = Decoder(demuxer.audio_stream)

while True:
    packet = demuxer.read_packet()
    eof = (packet is None)
    if eof or demuxer.video_stream.contains(packet):
        video_frames = video_decoder.decode(packet)
        print(f"decoded {len(video_frames)} video frames")
    if eof or demuxer.audio_stream.contains(packet):
        audio_frames = audio_decoder.decode(packet)
        print(f"decoded {len(audio_frames)} audio frames")
    if eof:
        break