Class: AviGlitch::Frames
- Inherits:
-
Object
- Object
- AviGlitch::Frames
- Includes:
- Enumerable
- Defined in:
- lib/aviglitch/frames.rb
Overview
Frames provides the interface to access each frame in the AVI file. It is implemented as Enumerable. You can access this object through AviGlitch#frames, for example:
avi = AviGlitch.new '/path/to/your.avi'
frames = avi.frames
frames.each do |frame|
## frame is a reference of an AviGlitch::Frame object
frame.data = frame.data.gsub(/\d/, '0')
end
In the block passed into iteration method, the parameter is a reference of AviGlitch::Frame object.
Instance Attribute Summary collapse
-
#avi ⇒ Object
readonly
Returns the value of attribute avi.
Instance Method Summary collapse
-
#*(times) ⇒ Object
Returns the new Frames as a
times
times repeated concatenation of the original Frames. -
#+(other_frames) ⇒ Object
Returns a concatenation of the two Frames as a new Frames instance.
-
#==(other) ⇒ Object
Returns true if
other
‘s frames are same as self’s frames. -
#[]=(*args) ⇒ Object
Removes frame(s) at the given index or the range (same as []).
-
#at(n) ⇒ Object
Returns one Frame object at the given index.
-
#clear ⇒ Object
Removes all frames and returns self.
-
#concat(other_frames) ⇒ Object
Appends the frames in the other Frames into the tail of self.
-
#data_size ⇒ Object
Returns the data size of total frames.
-
#delete_at(n) ⇒ Object
Deletes one Frame at the given index.
-
#each(&block) ⇒ Object
Enumerates the frames.
-
#first ⇒ Object
Returns the first Frame object.
-
#first_of(frame_type) ⇒ Object
Returns the first Frame object in
frame_type
. -
#index(frame) ⇒ Object
(also: #find_index)
Returns an index of the first found
frame
. -
#initialize(avi) ⇒ Frames
constructor
Creates a new AviGlitch::Frames object.
-
#insert(n, *args) ⇒ Object
Inserts the given Frame objects into the given index.
-
#inspect ⇒ Object
:nodoc:.
-
#last ⇒ Object
Returns the last Frame object.
-
#last_of(frame_type) ⇒ Object
Returns the last Frame object in
frame_type
. -
#mutate_keyframes_into_deltaframes!(range = nil) ⇒ Object
Mutates keyframes into deltaframes at given range, or all.
-
#push(frame) ⇒ Object
(also: #<<)
Appends the given Frame into the tail of self.
-
#rindex(frame) ⇒ Object
Returns an index of the first found
frame
, starting from the last. -
#safe_frames_count?(count) ⇒ Boolean
:nodoc:.
-
#size ⇒ Object
Returns the number of frames.
-
#size_of(frame_type) ⇒ Object
Returns the number of the specific
frame_type
. -
#slice(*args) ⇒ Object
(also: #[])
Returns the Frame object at the given index or returns new Frames object that sliced with the given index and length or with the Range.
-
#slice!(*args) ⇒ Object
Removes frame(s) at the given index or the range (same as slice).
-
#to_avi ⇒ Object
Generates new AviGlitch::Base instance using self.
Constructor Details
#initialize(avi) ⇒ Frames
Creates a new AviGlitch::Frames object.
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# File 'lib/aviglitch/frames.rb', line 25 def initialize avi @avi = avi end |
Instance Attribute Details
#avi ⇒ Object (readonly)
Returns the value of attribute avi.
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# File 'lib/aviglitch/frames.rb', line 21 def avi @avi end |
Instance Method Details
#*(times) ⇒ Object
Returns the new Frames as a times
times repeated concatenation of the original Frames.
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# File 'lib/aviglitch/frames.rb', line 133 def * times result = self.slice 0, 0 frames = self.slice 0..-1 times.times do result.concat frames end result end |
#+(other_frames) ⇒ Object
Returns a concatenation of the two Frames as a new Frames instance.
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# File 'lib/aviglitch/frames.rb', line 124 def + other_frames r = self.to_avi r.frames.concat other_frames r.frames end |
#==(other) ⇒ Object
Returns true if other
‘s frames are same as self’s frames.
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# File 'lib/aviglitch/frames.rb', line 368 def == other @avi == other.avi end |
#[]=(*args) ⇒ Object
Removes frame(s) at the given index or the range (same as []). Inserts the given Frame or Frames’s contents into the removed index.
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# File 'lib/aviglitch/frames.rb', line 185 def []= *args value = args.pop b, l = get_beginning_and_length *args ll = l.nil? ? 1 : l head = self.slice(0, b) rest = self.slice((b + ll)..-1) if l.nil? || value.kind_of?(Frame) head.push value elsif value.kind_of?(Frames) head.concat value else raise TypeError end new_frames = head + rest self.clear self.concat new_frames end |
#at(n) ⇒ Object
Returns one Frame object at the given index.
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# File 'lib/aviglitch/frames.rb', line 206 def at n frame = nil @avi.process_movi do |indices, movi| m = indices[n] unless m.nil? movi.pos = m[:offset] + 8 frame = Frame.new(movi.read(m[:size]), m[:id], m[:flag]) movi.rewind end [indices, movi] end frame end |
#clear ⇒ Object
Removes all frames and returns self.
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# File 'lib/aviglitch/frames.rb', line 89 def clear @avi.process_movi do |indices, movi| [[], StringIO.new] end self end |
#concat(other_frames) ⇒ Object
Appends the frames in the other Frames into the tail of self. It is destructive like Array does.
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# File 'lib/aviglitch/frames.rb', line 99 def concat other_frames raise TypeError unless other_frames.kind_of?(Frames) @avi.process_movi do |this_indices, this_movi| this_size = this_movi.size this_movi.pos = this_size other_frames.avi.process_movi do |other_indices, other_movi| while d = other_movi.read(BUFFER_SIZE) do this_movi.print d end = other_indices.collect do |m| x = m.dup x[:offset] += this_size x end this_indices.concat [other_indices, other_movi] end [this_indices, this_movi] end self end |
#data_size ⇒ Object
Returns the data size of total frames.
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# File 'lib/aviglitch/frames.rb', line 78 def data_size size = 0 @avi.process_movi do |indices, movi| size = movi.size [indices, movi] end size end |
#delete_at(n) ⇒ Object
Deletes one Frame at the given index.
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# File 'lib/aviglitch/frames.rb', line 350 def delete_at n self.slice! n end |
#each(&block) ⇒ Object
Enumerates the frames. It returns Enumerator if a block is not given.
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# File 'lib/aviglitch/frames.rb', line 32 def each &block if block_given? Tempfile.open('temp', binmode: true) do |newmovi| @avi.process_movi do |indices, movi| newindices = indices.select do |m| movi.pos = m[:offset] + 8 # 8 for id and size frame = Frame.new(movi.read(m[:size]), m[:id], m[:flag]) block.call frame unless frame.data.nil? m[:offset] = newmovi.pos m[:size] = frame.data.size m[:flag] = frame.flag m[:id] = frame.id newmovi.print m[:id] newmovi.print [frame.data.size].pack('V') newmovi.print frame.data newmovi.print "\0" if frame.data.size % 2 == 1 true else false end end [newindices, newmovi] end end else self.enum_for :each end end |
#first ⇒ Object
Returns the first Frame object.
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# File 'lib/aviglitch/frames.rb', line 222 def first self.slice(0) end |
#first_of(frame_type) ⇒ Object
Returns the first Frame object in frame_type
.
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# File 'lib/aviglitch/frames.rb', line 234 def first_of frame_type frame = nil @avi.process_movi do |indices, movi| indices.each do |m| movi.pos = m[:offset] + 8 f = Frame.new(movi.read(m[:size]), m[:id], m[:flag]) if f.is?(frame_type) frame = f break end end [indices, movi] end frame end |
#index(frame) ⇒ Object Also known as: find_index
Returns an index of the first found frame
.
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# File 'lib/aviglitch/frames.rb', line 270 def index frame n = -1 @avi.process_movi do |indices, movi| indices.each_with_index do |m, i| movi.pos = m[:offset] + 8 f = Frame.new(movi.read(m[:size]), m[:id], m[:flag]) if f == frame n = i break end end [indices, movi] end n end |
#insert(n, *args) ⇒ Object
Inserts the given Frame objects into the given index.
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# File 'lib/aviglitch/frames.rb', line 336 def insert n, *args new_frames = self.slice(0, n) args.each do |f| new_frames.push f end new_frames.concat self.slice(n..-1) self.clear self.concat new_frames self end |
#inspect ⇒ Object
:nodoc:
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# File 'lib/aviglitch/frames.rb', line 378 def inspect #:nodoc: "#<#{self.class.name}:#{sprintf("0x%x", object_id)} size=#{self.size}>" end |
#last ⇒ Object
Returns the last Frame object.
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# File 'lib/aviglitch/frames.rb', line 228 def last self.slice(self.size - 1) end |
#last_of(frame_type) ⇒ Object
Returns the last Frame object in frame_type
.
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# File 'lib/aviglitch/frames.rb', line 252 def last_of frame_type frame = nil @avi.process_movi do |indices, movi| indices.reverse.each do |m| movi.pos = m[:offset] + 8 f = Frame.new(movi.read(m[:size]), m[:id], m[:flag]) if f.is?(frame_type) frame = f break end end [indices, movi] end frame end |
#mutate_keyframes_into_deltaframes!(range = nil) ⇒ Object
Mutates keyframes into deltaframes at given range, or all.
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# File 'lib/aviglitch/frames.rb', line 356 def mutate_keyframes_into_deltaframes! range = nil range = 0..self.size if range.nil? self.each_with_index do |frame, i| if range.include? i frame.flag = 0 if frame.is_keyframe? end end self end |
#push(frame) ⇒ Object Also known as: <<
Appends the given Frame into the tail of self.
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# File 'lib/aviglitch/frames.rb', line 310 def push frame raise TypeError unless frame.kind_of? Frame @avi.process_movi do |indices, movi| this_size = movi.size movi.pos = this_size movi.print frame.id movi.print [frame.data.size].pack('V') movi.print frame.data movi.print "\0" if frame.data.size % 2 == 1 indices << { :id => frame.id, :flag => frame.flag, :offset => this_size, :size => frame.data.size, } [indices, movi] end self end |
#rindex(frame) ⇒ Object
Returns an index of the first found frame
, starting from the last.
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# File 'lib/aviglitch/frames.rb', line 292 def rindex frame n = -1 @avi.process_movi do |indices, movi| indices.reverse.each_with_index do |m, i| movi.pos = m[:offset] + 8 f = Frame.new(movi.read(m[:size]), m[:id], m[:flag]) if f == frame n = indices.size - 1 - i break end end [indices, movi] end n end |
#safe_frames_count?(count) ⇒ Boolean
:nodoc:
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# File 'lib/aviglitch/frames.rb', line 394 def safe_frames_count? count #:nodoc: warn "[DEPRECATION] `safe_frames_count?` is deprecated." true end |
#size ⇒ Object
Returns the number of frames.
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# File 'lib/aviglitch/frames.rb', line 64 def size @avi.indices.size end |
#size_of(frame_type) ⇒ Object
Returns the number of the specific frame_type
.
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# File 'lib/aviglitch/frames.rb', line 70 def size_of frame_type @avi.indices.select { |m| Frame.new(nil, m[:id], m[:flag]).is? frame_type }.size end |
#slice(*args) ⇒ Object Also known as: []
Returns the Frame object at the given index or returns new Frames object that sliced with the given index and length or with the Range. Just like Array.
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# File 'lib/aviglitch/frames.rb', line 147 def slice *args b, l = get_beginning_and_length *args if l.nil? self.at b else e = b + l - 1 r = self.to_avi r.frames.each_with_index do |f, i| unless i >= b && i <= e f.data = nil end end r.frames end end |
#slice!(*args) ⇒ Object
Removes frame(s) at the given index or the range (same as slice). Returns the new Frames contains removed frames.
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# File 'lib/aviglitch/frames.rb', line 170 def slice! *args b, l = get_beginning_and_length *args head, sliced, tail = () sliced = l.nil? ? self.slice(b) : self.slice(b, l) head = self.slice(0, b) l = 1 if l.nil? tail = self.slice((b + l)..-1) self.clear self.concat head + tail sliced end |