270 lines
8.2 KiB
Python
270 lines
8.2 KiB
Python
# People's Video Editor: high quality, GPU accelerated mp4 editor
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# Copyright (C) 2025 Roz K <roz@rozk.net>
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#
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# This file is part of People's Video Editor.
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#
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# People's Video Editor is free software: you can redistribute it and/or modify it under the terms of the
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# GNU General Public License as published by the Free Software Foundation, either version 3 of the License,
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# or (at your option) any later version.
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#
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# People's Video Editor is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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# without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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# See the GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License along with People's Video Editor.
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# If not, see <https://www.gnu.org/licenses/>.
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import errno
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import ctypes
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from pathlib import PurePath
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shared_library_path = PurePath(__file__).parent
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def load_shared_library(name):
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path = str(shared_library_path / ("lib" + name + ".so"))
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return ctypes.cdll.LoadLibrary(path)
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_avutil = load_shared_library("avutil")
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_avformat = load_shared_library("avformat")
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_avcodec = load_shared_library("avcodec")
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def _errtag(a, b, c, d):
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return -(ord(a) | (ord(b) << 8) | (ord(c) << 16) | (ord(d) << 24))
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if errno.EAGAIN < 0:
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AVERROR_EAGAIN = errno.EAGAIN
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else:
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AVERROR_EAGAIN = -errno.EAGAIN
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AVERROR_EOF = _errtag('E', 'O', 'F', ' ')
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_AV_ERROR_MAX_STRING_SIZE = 64
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AVMEDIA_TYPE_UNKNOWN = -1
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AVMEDIA_TYPE_VIDEO = 0
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AVMEDIA_TYPE_AUDIO = 1
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AVMEDIA_TYPE_DATA = 2
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AVMEDIA_TYPE_SUBTITLE = 3
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AVMEDIA_TYPE_ATTACHMENT = 4
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AV_NUM_DATA_POINTERS = 8
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c_uint8_p = ctypes.POINTER(ctypes.c_uint8)
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c_uint8_pp = ctypes.POINTER(c_uint8_p)
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class AVRational(ctypes.Structure):
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_fields_ = [
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("num", ctypes.c_int),
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("den", ctypes.c_int)]
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class AVFrame(ctypes.Structure):
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_fields_ = [
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("data", c_uint8_p * AV_NUM_DATA_POINTERS),
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("linesize", ctypes.c_int * AV_NUM_DATA_POINTERS),
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("extended_data", c_uint8_pp),
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("width", ctypes.c_int),
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("height", ctypes.c_int),
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("nb_samples", ctypes.c_int),
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("format", ctypes.c_int),
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("key_frame", ctypes.c_int),
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("pict_type", ctypes.c_int),
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("sample_aspect_ratio", AVRational),
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("pts", ctypes.c_int64),
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("pkt_dts", ctypes.c_int64),
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("time_base", AVRational)]
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# ...
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AVFrame_p = ctypes.POINTER(AVFrame)
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AVFrame_pp = ctypes.POINTER(AVFrame_p)
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class AVCodecParameters(ctypes.Structure):
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pass
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AVCodecParameters_p = ctypes.POINTER(AVCodecParameters)
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class AVStream(ctypes.Structure):
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_fields_ = [
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("av_class", ctypes.c_void_p),
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("index", ctypes.c_int),
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("id", ctypes.c_int),
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("codecpar", AVCodecParameters_p),
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("priv_data", ctypes.c_void_p),
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("time_base", AVRational)]
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# ...
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AVStream_p = ctypes.POINTER(AVStream)
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AVStream_pp = ctypes.POINTER(AVStream_p)
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class AVFormatContext(ctypes.Structure):
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_fields_ = [
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("av_class", ctypes.c_void_p),
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("iformat", ctypes.c_void_p),
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("oformat", ctypes.c_void_p),
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("priv_data", ctypes.c_void_p),
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("pb", ctypes.c_void_p),
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("ctx_flags", ctypes.c_int),
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("nb_streams", ctypes.c_uint),
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("streams", AVStream_pp)]
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# ...
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AVFormatContext_p = ctypes.POINTER(AVFormatContext)
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AVFormatContext_pp = ctypes.POINTER(AVFormatContext_p)
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class AVPacket(ctypes.Structure):
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_fields_ = [
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("buf", ctypes.c_void_p),
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("pts", ctypes.c_int64),
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("dts", ctypes.c_int64),
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("data", ctypes.c_void_p),
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("size", ctypes.c_int),
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("stream_index", ctypes.c_int)]
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# ...
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AVPacket_p = ctypes.POINTER(AVPacket)
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AVPacket_pp = ctypes.POINTER(AVPacket_p)
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class AVCodec(ctypes.Structure):
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_fields_ = [
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("name", ctypes.c_char_p),
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("long_name", ctypes.c_char_p)]
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# ...
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AVCodec_p = ctypes.POINTER(AVCodec)
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AVCodec_pp = ctypes.POINTER(AVCodec_p)
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class AVCodecContext(ctypes.Structure):
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pass
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AVCodecContext_p = ctypes.POINTER(AVCodecContext)
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AVCodecContext_pp = ctypes.POINTER(AVCodecContext_p)
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_avutil.av_strerror.restype = ctypes.c_int
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_avutil.av_strerror.argtypes = [
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ctypes.c_int, # errno
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ctypes.c_char_p, # errbuf
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ctypes.c_size_t] # errbuff_size
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def strerror(errno):
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errbuf = ctypes.create_string_buffer(_AV_ERROR_MAX_STRING_SIZE)
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_avutil.av_strerror(errno, errbuf, _AV_ERROR_MAX_STRING_SIZE)
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return errbuf.value.decode("utf-8")
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_avutil.av_frame_alloc.restype = AVFrame_p
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_avutil.av_frame_alloc.argtypes = None
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def frame_alloc():
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return _avutil.av_frame_alloc()
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_avutil.av_frame_free.restype = None
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_avutil.av_frame_free.argtypes = [AVFrame_pp]
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def frame_free(frame):
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_avutil.av_frame_free(ctypes.byref(frame))
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_avformat.avformat_alloc_context.restype = AVFormatContext_p
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_avformat.avformat_alloc_context.argtypes = None
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def format_alloc_context():
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return _avformat.avformat_alloc_context()
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_avformat.avformat_free_context.restype = None
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_avformat.avformat_free_context.argtypes = [AVFormatContext_p]
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def format_free_context(context):
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_avformat.avformat_free_context(context)
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_avformat.avformat_open_input.restype = ctypes.c_int
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_avformat.avformat_open_input.argtypes = [
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AVFormatContext_pp,
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ctypes.c_char_p, # url
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ctypes.c_void_p, # format
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ctypes.POINTER(ctypes.c_void_p)] # options
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def format_open_input(context, url):
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return _avformat.avformat_open_input(ctypes.byref(context), url.encode('ascii', 'ignore'), None, None)
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_avformat.avformat_close_input.restype = None
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_avformat.avformat_close_input.argtypes = [AVFormatContext_pp]
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def format_close_input(context):
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_avformat.avformat_close_input(ctypes.byref(context))
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_avformat.avformat_find_stream_info.restype = ctypes.c_int
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_avformat.avformat_find_stream_info.argtypes = [
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AVFormatContext_p,
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ctypes.POINTER(ctypes.c_void_p)] # options
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def format_find_stream_info(context):
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return _avformat.avformat_find_stream_info(context, None)
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_avformat.av_find_best_stream.restype = ctypes.c_int
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_avformat.av_find_best_stream.argtypes = [
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AVFormatContext_p,
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ctypes.c_int, # type
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ctypes.c_int, # wanted stream
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ctypes.c_int, # related stream
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AVCodec_pp,
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ctypes.c_int] # flags
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def format_find_best_stream(context, type):
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codec = AVCodec_p()
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index = _avformat.av_find_best_stream(context, type, -1, -1, ctypes.byref(codec), 0)
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return index, codec
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_avformat.av_packet_alloc.restype = AVPacket_p
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_avformat.av_packet_alloc.argtypes = None
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def packet_alloc():
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return _avformat.av_packet_alloc()
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_avformat.av_packet_free.restype = None
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_avformat.av_packet_free.argtypes = [AVPacket_pp]
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def packet_free(packet):
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_avformat.av_packet_free(ctypes.byref(packet))
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_avformat.av_read_frame.restype = ctypes.c_int
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_avformat.av_read_frame.argtypes = [AVFormatContext_p, AVPacket_p]
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def read_frame(context, packet):
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return _avformat.av_read_frame(context, packet)
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_avcodec.avcodec_alloc_context3.restype = AVCodecContext_p
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_avcodec.avcodec_alloc_context3.argtypes = [AVCodec_p]
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def codec_alloc_context(codec):
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return _avcodec.avcodec_alloc_context3(codec)
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_avcodec.avcodec_free_context.restype = None
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_avcodec.avcodec_free_context.argtypes = [AVCodecContext_pp]
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def codec_free_context(context):
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_avcodec.avcodec_free_context(ctypes.byref(context))
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_avcodec.avcodec_parameters_to_context.restype = ctypes.c_int
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_avcodec.avcodec_parameters_to_context.argtypes = [AVCodecContext_p, AVCodecParameters_p]
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def codec_parameters_to_context(context, parameters):
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return _avcodec.avcodec_parameters_to_context(context, parameters)
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_avcodec.avcodec_open2.restype = ctypes.c_int
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_avcodec.avcodec_open2.argtypes = [
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AVCodecContext_p,
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AVCodec_p,
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ctypes.POINTER(ctypes.c_void_p)] # options
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def codec_open(context, codec):
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return _avcodec.avcodec_open2(context, codec, None)
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_avcodec.avcodec_send_packet.restype = ctypes.c_int
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_avcodec.avcodec_send_packet.argtypes = [AVCodecContext_p, AVPacket_p]
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def codec_send_packet(context, packet):
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return _avcodec.avcodec_send_packet(context, packet)
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_avcodec.avcodec_receive_frame.restype = ctypes.c_int
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_avcodec.avcodec_receive_frame.argtypes = [AVCodecContext_p, AVFrame_p]
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def codec_receive_frame(context, frame):
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return _avcodec.avcodec_receive_frame(context, frame)
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