Author: ivo Date: Sun Nov 26 23:50:47 2006 New Revision: 21294 Modified: trunk/DOCS/tech/nut.txt Log: rename all *_nom (nominator) to the correct *_num (numerator) Modified: trunk/DOCS/tech/nut.txt ============================================================================== --- trunk/DOCS/tech/nut.txt (original) +++ trunk/DOCS/tech/nut.txt Sun Nov 26 23:50:47 2006 @@ -237,9 +237,9 @@ max_distance v time_base_count v for(i=0; i<time_base_count; i++) - time_base_nom v + time_base_num v time_base_denom v - time_base[i]= time_base_nom/time_base_denom + time_base[i]= time_base_num/time_base_denom tmp_pts=0 tmp_mul=1 tmp_stream=0 @@ -290,7 +290,7 @@ sample_height v colorspace_type v }else if(stream_class == audio){ - samplerate_nom v + samplerate_num v samplerate_denom v channel_count v } @@ -495,14 +495,14 @@ the id values used are the same as in avi, so if a codec uses a specific fourcc in avi then the same fourcc MUST be used here -time_base_nom (v) / time_base_denom (v) = time_base +time_base_num (v) / time_base_denom (v) = time_base the length of a timer tick in seconds, this MUST be equal to the 1/fps if FLAG_FIXED_FPS is set - time_base_nom and time_base_denom MUST NOT be 0 - time_base_nom and time_base_denom MUST be relatively prime + time_base_num and time_base_denom MUST NOT be 0 + time_base_num and time_base_denom MUST be relatively prime time_base_denom MUST be < 2^31 examples: - fps time_base_nom time_base_denom + fps time_base_num time_base_denom 30 1 30 29.97 1001 30000 23.976 1001 24000 @@ -517,10 +517,10 @@ To switch from 2 different timebases, the following calculation is defined: - ln = from_time_base_nom*to_time_base_denom + ln = from_time_base_num*to_time_base_denom sn = from_timestamp d1 = from_time_base_denom - d2 = to_time_base_nom + d2 = to_time_base_num timestamp = (ln/d1*sn + ln%d1*sn/d1)/d2 Note: this calculation MUST be done with unsigned 64 bit integers, and is equivalent to (ln*sn)/(d1*d2) but this would require a 96bit integer @@ -711,7 +711,7 @@ 17 ITU Rec 624 / ITU Rec 601 Y range: 0..255 Cb/Cr range: 0..255 18 ITU Rec 709 Y range: 0..255 Cb/Cr range: 0..255 -samplerate_nom (v) / samplerate_denom (v) = samplerate +samplerate_num (v) / samplerate_denom (v) = samplerate the number of samples per second, MUST NOT be 0 crc32 checksum