search for: floor1_final_y

Displaying 3 results from an estimated 3 matches for "floor1_final_y".

2002 Aug 13
1
Specification documents
...latter, and suggestions for correcting them. --- #1: in vorbis-spec-floor1.html, packet decode: Between 14) and 15) a crucial step is missing. Please insert: 14a) [cval] >>= [cbits] ---- #2: in vorbis-spec-floor1.html, curve computation step #1: The distinction between [floor1_Y] and [floor1_final_Y] looks invalid. IIRC the prediction loop works as follows: At the beginning Y[0] and Y[1] contain the absolute amplitudes (log scale) at the lower resp. upper X boundaries, and the Y[i] for i>=2 are the wrapped difference values, which are then progressively replaced by the predicted absolute am...
2002 Sep 23
2
More errors in the file format specification Was: Test files for decoder implementation
Hi, I've found some more errors in the file format specification (or at least points, where the specification and actual libvorbis implementation mismatch): - Floor 1 / curve computation / step 1: amplitude value synthesis 21) vector [floor1_final_Y] element [i] = [predicted] - (([val] - 1) divided by 2 using integer division) hould be: 21) vector [floor1_final_Y] element [i] = [predicted] - (([val] + 1) divided by 2 using integer division) <p>- in the function render_line 11) [ady] = [ady] - [base] * [adx] hould be: 11) [a...
2002 Oct 15
5
Specification change requests
...if and when accepting or rejecting them be so very kind and inform me about it. I will also once again try to work through the residue specification, as I beleive there are more errors in that part. Tor <p>############### #2002-09-23-001 Floor 1 / curve computation / step 1: 23) vector [floor1_final_Y] element [i] = [predicted] - ([val] - [lowroom]) - 1 hould be: 23) vector [floor1_final_Y] element [i] = [predicted] - [val] + [hiroom] - 1 due to floor1.c, line 1019: val = -1-(val-hiroom); <p>############### #2002-09-23-002 Floor 1 / curve computation / step 1: 25) vector [floo...