cpython/Lib/plat-mac/videoreader.py

# Video file reader, using QuickTime
#
# This module was quickly ripped out of another software package, so there is a good
# chance that it does not work as-is and it needs some hacking.
#
# Jack Jansen, August 2000
#

from warnings import warnpy3k
warnpy3k("In 3.x, the videoreader module is removed.")


import sys
from Carbon import Qt
from Carbon import QuickTime
from Carbon import Qd
from Carbon import Qdoffs
from Carbon import QDOffscreen
from Carbon import Res
try:
    import MediaDescr
except ImportError:
    def _audiodescr(data):
        return None
else:
    def _audiodescr(data):
        return MediaDescr.SoundDescription.decode(data)
try:
    from imgformat import macrgb
except ImportError:
    macrgb = "Macintosh RGB format"
import os
# import audio.format

class VideoFormat:
    def __init__(self, name, descr, width, height, format):
        self.__name = name
        self.__descr = descr
        self.__width = width
        self.__height = height
        self.__format = format

    def getname(self):
        return self.__name

    def getdescr(self):
        return self.__descr

    def getsize(self):
        return self.__width, self.__height

    def getformat(self):
        return self.__format

class _Reader:
    def __init__(self, path):
        fd = Qt.OpenMovieFile(path, 0)
        self.movie, d1, d2 = Qt.NewMovieFromFile(fd, 0, 0)
        self.movietimescale = self.movie.GetMovieTimeScale()
        try:
            self.audiotrack = self.movie.GetMovieIndTrackType(1,
                QuickTime.AudioMediaCharacteristic, QuickTime.movieTrackCharacteristic)
            self.audiomedia = self.audiotrack.GetTrackMedia()
        except Qt.Error:
            self.audiotrack = self.audiomedia = None
            self.audiodescr = {}
        else:
            handle = Res.Handle('')
            n = self.audiomedia.GetMediaSampleDescriptionCount()
            self.audiomedia.GetMediaSampleDescription(1, handle)
            self.audiodescr = _audiodescr(handle.data)
            self.audiotimescale = self.audiomedia.GetMediaTimeScale()
            del handle

        try:
            self.videotrack = self.movie.GetMovieIndTrackType(1,
                QuickTime.VisualMediaCharacteristic, QuickTime.movieTrackCharacteristic)
            self.videomedia = self.videotrack.GetTrackMedia()
        except Qt.Error:
            self.videotrack = self.videomedia = self.videotimescale = None
        if self.videotrack:
            self.videotimescale = self.videomedia.GetMediaTimeScale()
            x0, y0, x1, y1 = self.movie.GetMovieBox()
            self.videodescr = {'width':(x1-x0), 'height':(y1-y0)}
            self._initgworld()
        self.videocurtime = None
        self.audiocurtime = None


    def __del__(self):
        self.audiomedia = None
        self.audiotrack = None
        self.videomedia = None
        self.videotrack = None
        self.movie = None

    def _initgworld(self):
        old_port, old_dev = Qdoffs.GetGWorld()
        try:
            movie_w = self.videodescr['width']
            movie_h = self.videodescr['height']
            movie_rect = (0, 0, movie_w, movie_h)
            self.gworld = Qdoffs.NewGWorld(32,  movie_rect, None, None, QDOffscreen.keepLocal)
            self.pixmap = self.gworld.GetGWorldPixMap()
            Qdoffs.LockPixels(self.pixmap)
            Qdoffs.SetGWorld(self.gworld.as_GrafPtr(), None)
            Qd.EraseRect(movie_rect)
            self.movie.SetMovieGWorld(self.gworld.as_GrafPtr(), None)
            self.movie.SetMovieBox(movie_rect)
            self.movie.SetMovieActive(1)
            self.movie.MoviesTask(0)
            self.movie.SetMoviePlayHints(QuickTime.hintsHighQuality, QuickTime.hintsHighQuality)
            # XXXX framerate
        finally:
            Qdoffs.SetGWorld(old_port, old_dev)

    def _gettrackduration_ms(self, track):
        tracktime = track.GetTrackDuration()
        return self._movietime_to_ms(tracktime)

    def _movietime_to_ms(self, time):
        value, d1, d2 = Qt.ConvertTimeScale((time, self.movietimescale, None), 1000)
        return value

    def _videotime_to_ms(self, time):
        value, d1, d2 = Qt.ConvertTimeScale((time, self.videotimescale, None), 1000)
        return value

    def _audiotime_to_ms(self, time):
        value, d1, d2 = Qt.ConvertTimeScale((time, self.audiotimescale, None), 1000)
        return value

    def _videotime_to_movietime(self, time):
        value, d1, d2 = Qt.ConvertTimeScale((time, self.videotimescale, None),
                self.movietimescale)
        return value

    def HasAudio(self):
        return not self.audiotrack is None

    def HasVideo(self):
        return not self.videotrack is None

    def GetAudioDuration(self):
        if not self.audiotrack:
            return 0
        return self._gettrackduration_ms(self.audiotrack)

    def GetVideoDuration(self):
        if not self.videotrack:
            return 0
        return self._gettrackduration_ms(self.videotrack)

    def GetAudioFormat(self):
        if not self.audiodescr:
            return None, None, None, None, None
        bps = self.audiodescr['sampleSize']
        nch = self.audiodescr['numChannels']
        if nch == 1:
            channels = ['mono']
        elif nch == 2:
            channels = ['left', 'right']
        else:
            channels = map(lambda x: str(x+1), range(nch))
        if bps % 8:
            # Funny bits-per sample. We pretend not to understand
            blocksize = 0
            fpb = 0
        else:
            # QuickTime is easy (for as far as we support it): samples are always a whole
            # number of bytes, so frames are nchannels*samplesize, and there's one frame per block.
            blocksize = (bps/8)*nch
            fpb = 1
        if self.audiodescr['dataFormat'] == 'raw ':
            encoding = 'linear-excess'
        elif self.audiodescr['dataFormat'] == 'twos':
            encoding = 'linear-signed'
        else:
            encoding = 'quicktime-coding-%s'%self.audiodescr['dataFormat']
##      return audio.format.AudioFormatLinear('quicktime_audio', 'QuickTime Audio Format',
##          channels, encoding, blocksize=blocksize, fpb=fpb, bps=bps)
        return channels, encoding, blocksize, fpb, bps

    def GetAudioFrameRate(self):
        if not self.audiodescr:
            return None
        return int(self.audiodescr['sampleRate'])

    def GetVideoFormat(self):
        width = self.videodescr['width']
        height = self.videodescr['height']
        return VideoFormat('dummy_format', 'Dummy Video Format', width, height, macrgb)

    def GetVideoFrameRate(self):
        tv = self.videocurtime
        if tv is None:
            tv = 0
        flags = QuickTime.nextTimeStep|QuickTime.nextTimeEdgeOK
        tv, dur = self.videomedia.GetMediaNextInterestingTime(flags, tv, 1.0)
        dur = self._videotime_to_ms(dur)
        return int((1000.0/dur)+0.5)

    def ReadAudio(self, nframes, time=None):
        if not time is None:
            self.audiocurtime = time
        flags = QuickTime.nextTimeStep|QuickTime.nextTimeEdgeOK
        if self.audiocurtime is None:
            self.audiocurtime = 0
        tv = self.audiomedia.GetMediaNextInterestingTimeOnly(flags, self.audiocurtime, 1.0)
        if tv < 0 or (self.audiocurtime and tv < self.audiocurtime):
            return self._audiotime_to_ms(self.audiocurtime), None
        h = Res.Handle('')
        desc_h = Res.Handle('')
        size, actualtime, sampleduration, desc_index, actualcount, flags = \
            self.audiomedia.GetMediaSample(h, 0, tv, desc_h, nframes)
        self.audiocurtime = actualtime + actualcount*sampleduration
        return self._audiotime_to_ms(actualtime), h.data

    def ReadVideo(self, time=None):
        if not time is None:
            self.videocurtime = time
        flags = QuickTime.nextTimeStep
        if self.videocurtime is None:
            flags = flags | QuickTime.nextTimeEdgeOK
            self.videocurtime = 0
        tv = self.videomedia.GetMediaNextInterestingTimeOnly(flags, self.videocurtime, 1.0)
        if tv < 0 or (self.videocurtime and tv <= self.videocurtime):
            return self._videotime_to_ms(self.videocurtime), None
        self.videocurtime = tv
        moviecurtime = self._videotime_to_movietime(self.videocurtime)
        self.movie.SetMovieTimeValue(moviecurtime)
        self.movie.MoviesTask(0)
        return self._videotime_to_ms(self.videocurtime), self._getpixmapcontent()

    def _getpixmapcontent(self):
        """Shuffle the offscreen PixMap data, because it may have funny stride values"""
        rowbytes = Qdoffs.GetPixRowBytes(self.pixmap)
        width = self.videodescr['width']
        height = self.videodescr['height']
        start = 0
        rv = ''
        for i in range(height):
            nextline = Qdoffs.GetPixMapBytes(self.pixmap, start, width*4)
            start = start + rowbytes
            rv = rv + nextline
        return rv

def reader(url):
    try:
        rdr = _Reader(url)
    except IOError:
        return None
    return rdr

def _test():
    import EasyDialogs
    try:
        import img
    except ImportError:
        img = None
    import MacOS
    Qt.EnterMovies()
    path = EasyDialogs.AskFileForOpen(message='Video to convert')
    if not path: sys.exit(0)
    rdr = reader(path)
    if not rdr:
        sys.exit(1)
    dstdir = EasyDialogs.AskFileForSave(message='Name for output folder')
    if not dstdir: sys.exit(0)
    num = 0
    os.mkdir(dstdir)
    videofmt = rdr.GetVideoFormat()
    imgfmt = videofmt.getformat()
    imgw, imgh = videofmt.getsize()
    timestamp, data = rdr.ReadVideo()
    while data:
        fname = 'frame%04.4d.jpg'%num
        num = num+1
        pname = os.path.join(dstdir, fname)
        if not img: print 'Not',
        print 'Writing %s, size %dx%d, %d bytes'%(fname, imgw, imgh, len(data))
        if img:
            wrt = img.writer(imgfmt, pname)
            wrt.width = imgw
            wrt.height = imgh
            wrt.write(data)
            timestamp, data = rdr.ReadVideo()
            MacOS.SetCreatorAndType(pname, 'ogle', 'JPEG')
            if num > 20:
                print 'stopping at 20 frames so your disk does not fill up:-)'
                break
    print 'Total frames:', num

if __name__ == '__main__':
    _test()
    sys.exit(1)