Lines Matching refs:item
75 \item All three fields set to the same value implies a fixed rate, or tightly bounded, nearly fixed-rate bitstream
76 \item Only nominal set implies a VBR or ABR stream that averages the nominal bitrate
77 \item Maximum and or minimum set implies a VBR bitstream that obeys the bitrate limits
78 \item None set indicates the encoder does not care to speculate.
110 \item \varname{[vorbis_codebook_count]} = read eight bits as unsigned integer and add one
111 \item Decode \varname{[vorbis_codebook_count]} codebooks in order as defined
126 \item \varname{[vorbis_time_count]} = read 6 bits as unsigned integer and add one
127 \item read \varname{[vorbis_time_count]} 16 bit values; each value should be zero. If any value is nonzero, this is an error condition and the stream is undecodable.
138 \item \varname{[vorbis_floor_count]} = read 6 bits as unsigned integer and add one
139 \item For each \varname{[i]} of \varname{[vorbis_floor_count]} floor numbers:
141 \item read the floor type: vector \varname{[vorbis_floor_types]} element \varname{[i]} =
143 \item If the floor type is zero, decode the floor
147 \item If the floor type is one,
149 \item If the the floor type is greater than one, this stream is undecodable; ERROR CONDITION
162 \item \varname{[vorbis_residue_count]} = read 6 bits as unsigned integer and add one
164 \item For each of \varname{[vorbis_residue_count]} residue numbers:
166 \item read the residue type; vector \varname{[vorbis_residue_types]} element \varname{[i]} = read 16 bits as unsigned integer
167 \item If the residue type is zero,
169 \item If the the residue type is greater than two, this stream is undecodable; ERROR CONDITION
187 \item \varname{[vorbis_mapping_count]} = read 6 bits as unsigned integer and add one
188 \item For each \varname{[i]} of \varname{[vorbis_mapping_count]} mapping numbers:
190 \item read the mapping type: 16 bits as unsigned integer. There's no reason to save the mapping type in Vorbis I.
191 \item If the mapping type is nonzero, the stream is undecodable
192 \item If the mapping type is zero:
194 \item read 1 bit as a boolean flag
196 \item if set, \varname{[vorbis_mapping_submaps]} = read 4 bits as unsigned integer and add one
197 \item if unset, \varname{[vorbis_mapping_submaps]} = 1
201 \item read 1 bit as a boolean flag
203 \item if set, square polar channel mapping is in use:
205 \item \varname{[vorbis_mapping_coupling_steps]} = read 8 bits as unsigned integer and add one
206 \item for \varname{[j]} each of \varname{[vorbis_mapping_coupling_steps]} steps:
208 \item vector \varname{[vorbis_mapping_magnitude]} element \varname{[j]}= read \link{vorbis:spec:ilog}{ilog}(\varname{[audio_channels]} - 1) bits as unsigned integer
209 \item vector \varname{[vorbis_mapping_angle]} element \varname{[j]}= read \link{vorbis:spec:ilog}{ilog}(\varname{[audio_channels]} - 1) bits as unsigned integer
210 \item the numbers read in the above two steps are channel numbers representing the channel to treat as magnitude and the channel to treat as angle, respectively. If for any coupling step the angle channel number equals the magnitude channel number, the magnitude channel number is greater than \varname{[audio_channels]}-1, or the angle channel is greater than \varname{[audio_channels]}-1, the stream is undecodable.
217 \item if unset, \varname{[vorbis_mapping_coupling_steps]} = 0
221 \item read 2 bits (reserved field); if the value is nonzero, the stream is undecodable
222 \item if \varname{[vorbis_mapping_submaps]} is greater than one, we read channel multiplex settings. For each \varname{[j]} of \varname{[audio_channels]} channels:
224 \item vector \varname{[vorbis_mapping_mux]} element \varname{[j]} = read 4 bits as unsigned integer
225 \item if the value is greater than the highest numbered submap (\varname{[vorbis_mapping_submaps]} - 1), this in an error condition rendering the stream undecodable
228 \item for each submap \varname{[j]} of \varname{[vorbis_mapping_submaps]} submaps, read the floor and residue numbers for use in decoding that submap:
230 \item read and discard 8 bits (the unused time configuration placeholder)
231 \item read 8 bits as unsigned integer for the floor number; save in vector \varname{[vorbis_mapping_submap_floor]} element \varname{[j]}
232 \item verify the floor number is not greater than the highest number floor configured for the bitstream. If it is, the bitstream is undecodable
233 \item read 8 bits as unsigned integer for the residue number; save in vector \varname{[vorbis_mapping_submap_residue]} element \varname{[j]}
234 \item verify the residue number is not greater than the highest number residue configured for the bitstream. If it is, the bitstream is undecodable
237 \item save this mapping configuration in slot \varname{[i]} of the mapping configuration array \varname{[vorbis_mapping_configurations]}.
249 \item \varname{[vorbis_mode_count]} = read 6 bits as unsigned integer and add one
250 \item For each of \varname{[vorbis_mode_count]} mode numbers:
252 \item \varname{[vorbis_mode_blockflag]} = read 1 bit
253 \item \varname{[vorbis_mode_windowtype]} = read 16 bits as unsigned integer
254 \item \varname{[vorbis_mode_transformtype]} = read 16 bits as unsigned integer
255 \item \varname{[vorbis_mode_mapping]} = read 8 bits as unsigned integer
256 \item verify ranges; zero is the only legal value in Vorbis I for
259 \item save this mode configuration in slot \varname{[i]} of the mode configuration array
263 \item read 1 bit as a framing flag. If unset, a framing error occurred and the stream is not
288 \item read 1 bit \varname{[packet_type]}; check that packet type is 0 (audio)
289 \item read \link{vorbis:spec:ilog}{ilog}([vorbis_mode_count]-1) bits
291 \item decode blocksize \varname{[n]} is equal to \varname{[blocksize_0]} if
293 \item perform window selection and setup; this window is used later by the inverse MDCT:
295 \item if this is a long window (the \varname{[vorbis_mode_blockflag]} flag of this mode is
298 \item read 1 bit for \varname{[previous_window_flag]}
299 \item read 1 bit for \varname{[next_window_flag]}
300 \item if \varname{[previous_window_flag]} is not set, the left half
306 \item if \varname{[next_window_flag]} is not set, the right half of
314 \item if this is a short window, the window is always the same
326 \item \varname{[window_center]} = \varname{[n]} / 2
327 \item if (\varname{[vorbis_mode_blockflag]} is set and \varname{[previous_window_flag]} is
330 \item \varname{[left_window_start]} = \varname{[n]}/4 -
332 \item \varname{[left_window_end]} = \varname{[n]}/4 + \varname{[blocksize_0]}/4
333 \item \varname{[left_n]} = \varname{[blocksize_0]}/2
337 \item \varname{[left_window_start]} = 0
338 \item \varname{[left_window_end]} = \varname{[window_center]}
339 \item \varname{[left_n]} = \varname{[n]}/2
342 \item if (\varname{[vorbis_mode_blockflag]} is set and \varname{[next_window_flag]} is not
345 \item \varname{[right_window_start]} = \varname{[n]*3}/4 -
347 \item \varname{[right_window_end]} = \varname{[n]*3}/4 +
349 \item \varname{[right_n]} = \varname{[blocksize_0]}/2
353 \item \varname{[right_window_start]} = \varname{[window_center]}
354 \item \varname{[right_window_end]} = \varname{[n]}
355 \item \varname{[right_n]} = \varname{[n]}/2
358 \item window from range 0 ... \varname{[left_window_start]}-1 inclusive is zero
359 \item for \varname{[i]} in range \varname{[left_window_start]} ...
361 \item window from range \varname{[left_window_end]} ... \varname{[right_window_start]}-1
362 inclusive is one\item for \varname{[i]} in range \varname{[right_window_start]} ... \varname{[right_window_end]}-1, window(\varname{[i]}) = $\sin(\frac{\pi}{2} * \sin^2($ (\varname{[i]}-\varname{[right_window_start]}+0.5) / \varname{[right_n]} $ * \frac{\pi}{2} + \frac{\pi}{2})$ )
363 \item window from range \varname{[right_window_start]} ... \varname{[n]}-1 is
387 \item \varname{[submap_number]} = element \varname{[i]} of vector [vorbis_mapping_mux]
388 \item \varname{[floor_number]} = element \varname{[submap_number]} of vector
390 \item if the floor type of this
395 \item if the type of this floor
398 \item save the needed decoded floor information for channel for later synthesis
399 \item if the decoded floor returned 'unused', set vector \varname{[no_residue]} element
423 \item if either \varname{[no_residue]} entry for channel
443 \item \varname{[ch]} = 0
444 \item for each channel \varname{[j]} in order from 0 ... \varname{[audio_channels]} - 1
446 \item if channel \varname{[j]} in submap \varname{[i]} (vector \varname{[vorbis_mapping_mux]} element \varname{[j]} is equal to \varname{[i]})
448 \item if vector \varname{[no_residue]} element \varname{[j]} is true
450 \item vector \varname{[do_not_decode_flag]} element \varname{[ch]} is set
454 \item vector \varname{[do_not_decode_flag]} element \varname{[ch]} is unset
457 \item increment \varname{[ch]}
461 \item \varname{[residue_number]} = vector \varname{[vorbis_mapping_submap_residue]} element \varname{[i]}
462 \item \varname{[residue_type]} = vector \varname{[vorbis_residue_types]} element \varname{[residue_number]}
463 \item decode \varname{[ch]} vectors using residue \varname{[residue_number]}, according to type \varname{[residue_type]}, also passing vector \varname{[do_not_decode_flag]} to indicate which vectors in the bundle should not be decoded. Correct per-vector decode length is \varname{[n]}/2.
464 \item \varname{[ch]} = 0
465 \item for each channel \varname{[j]} in order from 0 ... \varname{[audio_channels]}
467 \item if channel \varname{[j]} is in submap \varname{[i]} (vector \varname{[vorbis_mapping_mux]} element \varname{[j]} is equal to \varname{[i]})
469 \item residue vector for channel \varname{[j]} is set to decoded residue vector \varname{[ch]}
470 \item increment \varname{[ch]}
484 \item \varname{[magnitude_vector]} = the residue vector for channel
486 \item \varname{[angle_vector]} = the residue vector for channel (vector
488 \item for each scalar value \varname{[M]} in vector \varname{[magnitude_vector]} and the corresponding scalar value \varname{[A]} in vector \varname{[angle_vector]}:
490 \item if (\varname{[M]} is greater than zero)
492 \item if (\varname{[A]} is greater than zero)
494 \item \varname{[new_M]} = \varname{[M]}
495 \item \varname{[new_A]} = \varname{[M]}-\varname{[A]}
499 \item \varname{[new_A]} = \varname{[M]}
500 \item \varname{[new_M]} = \varname{[M]}+\varname{[A]}
506 \item if (\varname{[A]} is greater than zero)
508 \item \varname{[new_M]} = \varname{[M]}
509 \item \varname{[new_A]} = \varname{[M]}+\varname{[A]}
513 \item \varname{[new_A]} = \varname{[M]}
514 \item \varname{[new_M]} = \varname{[M]}-\varname{[A]}
519 \item set scalar value \varname{[M]} in vector \varname{[magnitude_vector]} to \varname{[new_M]}
520 \item set scalar value \varname{[A]} in vector \varname{[angle_vector]} to \varname{[new_A]}
612 \item[three channels]
615 \item[two channels]
618 \item[three channels]
622 \item[four channels]
626 \item[five channels]
630 \item[six channels]
634 \item[greater than six channels]