Class: FFruby::Stream

Inherits:
Object
  • Object
show all
Defined in:
ext/ffruby/ffrubystream.c,
ext/ffruby/ffrubystream.c

Overview

An interface to FFmpeg on any type of stream. Provides access to generic metadata.

Direct Known Subclasses

AudioStream, VideoStream

Instance Method Summary collapse

Constructor Details

#new(file, index) ⇒ FFruby::Stream

Creates an FFruby::Stream instance using the given FFruby::File and stream index. This should usually only be called by FFruby itself. Access stream instances using FFruby::File#streams instead.



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# File 'ext/ffruby/ffrubystream.c', line 183

static VALUE ffrs_initialize(VALUE self, VALUE file, VALUE index)
{
  AVFormatContext *fmt;
  unsigned int i = FIX2UINT(index);

  Data_Get_Struct(file, AVFormatContext, fmt);

  if (i >= fmt->nb_streams)
    rb_raise(rb_eIndexError, "Stream index out of range!");

  DATA_PTR(self) = fmt->streams[i];

  return self;
}

Instance Method Details

#bit_rate ⇒ Object

Returns the bit rate.



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# File 'ext/ffruby/ffrubystream.c', line 95

static VALUE ffrs_bit_rate(VALUE self)
{
  AVStream *stream = ffrs_get_stream(self);
  return INT2NUM(stream->codec->bit_rate);
}

#codec ⇒ Object

Returns the codec name.



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# File 'ext/ffruby/ffrubystream.c', line 63

static VALUE ffrs_codec(VALUE self)
{
  AVStream *stream = ffrs_get_stream(self);
  ffrs_open_codec(stream);
  return rb_str_new2(stream->codec->codec->name);
}

#tag ⇒ Object

Returns the FourCC tag.



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# File 'ext/ffruby/ffrubystream.c', line 71

static VALUE ffrs_tag(VALUE self)
{
  char tag[4];
  signed int i, j;
  AVStream *stream = ffrs_get_stream(self);

  i = stream->codec->codec_tag;

  for (j = 3; j >= 0; j -= 1)
  {
    tag[j] = i >> (j * 8);
    i -= tag[j] << (j * 8);
  }

  for (j = 3; j >= 0; j -= 1)
  {
    if (tag[j] != '\0')
      break;
  }

  return rb_str_new(tag, j + 1);
}