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rb_ogg.c
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rb_ogg.c
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#include <icanhasaudio.h>
size_t rb_ogg_read(void *ptr, size_t size, size_t nmemb, void *datasource) {
VALUE file = (VALUE)datasource;
VALUE str;
size_t length;
str = rb_funcall(file, rb_intern("read"), 1, INT2NUM(size * nmemb));
if(str == Qnil) return 0;
length = NUM2INT(rb_funcall(str, rb_intern("length"), 0));
memcpy(ptr, StringValuePtr(str), length);
return length;
}
int rb_ogg_seek(void *datasource, ogg_int64_t offset, int whence) {
VALUE file = (VALUE)datasource;
if(rb_respond_to(file, rb_intern("seek")) == Qtrue) {
return NUM2INT(rb_funcall( file,
rb_intern("seek"),
2,
INT2NUM(offset),
INT2NUM(whence)));
}
return -1;
}
int rb_ogg_close(void *datasource) {
VALUE file = (VALUE)datasource;
rb_funcall(file, rb_intern("close"), 0);
return 0;
}
long rb_ogg_tell(void *datasource) {
VALUE file = (VALUE)datasource;
return NUM2LONG(rb_funcall(file, rb_intern("tell"), 0));
}
/*
* call-seq:
* decoder.decode(input_io, output_io)
*
* Decode the input IO and write it to the output IO.
*/
VALUE method_ogg_decode(VALUE self, VALUE infile, VALUE outf) {
OggVorbis_File vf;
ov_callbacks callbacks;
int bs = 0;
char buf[8192];
int buflen = 8192;
unsigned int written = 0;
int ret;
ogg_int64_t length = 0;
int seekable = 0;
VALUE raw;
char headbuf[44];
VALUE bits;
VALUE endian;
VALUE sign;
raw = rb_iv_get(self, "@raw");
if(raw == Qnil) {
raw = Qfalse;
rb_iv_set(self, "@raw", Qfalse);
}
bits = rb_iv_get(self, "@bits");
if(bits == Qnil) {
bits = INT2NUM(16);
rb_iv_set(self, "@bits", INT2NUM(16));
}
endian = rb_iv_get(self, "@endian");
if(endian == Qnil) {
rb_iv_set(self, "@endian", INT2NUM(0));
endian = INT2NUM(0);
}
sign = rb_iv_get(self, "@sign");
if(sign == Qnil) {
rb_iv_set(self, "@sign", INT2NUM(1));
sign = INT2NUM(1);
}
callbacks.read_func = rb_ogg_read;
callbacks.seek_func = rb_ogg_seek;
callbacks.close_func = rb_ogg_close;
callbacks.tell_func = rb_ogg_tell;
if(ov_open_callbacks((void *)infile, &vf, NULL, 0, callbacks) < 0) {
rb_raise(rb_eRuntimeError, "Failed to open input as vorbis.\n");
}
if(ov_seekable(&vf)) {
seekable = 1;
length = ov_pcm_total(&vf, 0);
}
if(!raw) {
prelim_header( self,
headbuf,
0x7fffffff,
length,
ov_info(&vf,0)->channels,
ov_info(&vf,0)->rate );
rb_funcall(outf, rb_intern("write"), 1, rb_str_new(headbuf, 44));
}
while((ret = ov_read(&vf, buf, buflen, NUM2INT(endian), NUM2INT(bits)/8, NUM2INT(sign), &bs)) != 0) {
if(bs !=0) {
rb_raise(rb_eRuntimeError,
"Only one logical bitstream currently supported.\n");
}
if(ret) {
rb_funcall(outf, rb_intern("write"), 1, rb_str_new(buf, ret));
written += ret;
}
}
if(seekable && !raw) {
rewrite_header(headbuf, written);
rb_funcall( outf,
rb_intern("seek"),
2,
INT2NUM(0),
rb_const_get(rb_cIO, rb_intern("SEEK_SET")) );
rb_funcall(outf, rb_intern("write"), 1, rb_str_new(headbuf, 44));
}
ov_clear(&vf);
return Qnil;
}