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.



183
184
185
186
187
188
189
190
191
192
193
194
195
196
 
# 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.



95
96
97
98
99
 
# 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.



63
64
65
66
67
68
 
# 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.



71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
 
# 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);
}