299 lines
9.0 KiB
C
299 lines
9.0 KiB
C
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/*******************************************************************************/
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/* Copyright (C) 2008 Jonathan Moore Liles */
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/* */
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/* This program is free software; you can redistribute it and/or modify it */
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/* under the terms of the GNU General Public License as published by the */
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/* Free Software Foundation; either version 2 of the License, or (at your */
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/* option) any later version. */
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/* */
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/* This program is distributed in the hope that it will be useful, but WITHOUT */
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/* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or */
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/* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for */
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/* more details. */
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/* */
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/* You should have received a copy of the GNU General Public License along */
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/* with This program; see the file COPYING. If not,write to the Free Software */
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/* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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/*******************************************************************************/
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/**********/
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/* Engine */
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/**********/
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#include "../Audio_Region.H"
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#include "Audio_File.H"
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#include "dsp.h"
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#include "const.h"
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#include "const.h"
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#include "debug.h"
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#include "Thread.H"
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/** Apply a (portion of) fade from /start/ to a buffer up to size /nframes/. */
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void
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Audio_Region::Fade::apply ( sample_t *buf, Audio_Region::Fade::fade_dir_e dir, nframes_t start, nframes_t nframes ) const
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{
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// printf( "apply fade %s: start=%ld end=%lu\n", dir == Fade::Out ? "out" : "in", start, end );
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if ( ! nframes )
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return;
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nframes_t n = nframes;
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const double inc = increment();
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double fi = start / (double)length;
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if ( dir == Fade::Out )
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{
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fi = 1.0f - fi;
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for ( ; n--; fi -= inc )
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*(buf++) *= gain( fi );
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}
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else
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for ( ; n--; fi += inc )
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*(buf++) *= gain( fi );
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}
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/** read the overlapping part of /channel/ at /pos/ for /nframes/ of
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this region into /buf/, where /pos/ is in timeline frames */
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/* this runs in the diskstream thread. */
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/* FIXME: it is far more efficient to read all the channels from a
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multichannel source at once... But how should we handle the case of a
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mismatch between the number of channels in this region's source and
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the number of channels on the track/buffer this data is being read
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for? Would it not be better to simply buffer and deinterlace the
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frames in the Audio_File class instead, so that sequential requests
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for different channels at the same position avoid hitting the disk
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again? */
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nframes_t
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Audio_Region::read ( sample_t *buf, nframes_t pos, nframes_t nframes, int channel ) const
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{
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THREAD_ASSERT( Playback );
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const Range r = _range;
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/* do nothing if we aren't covered by this frame range */
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if ( pos > r.start + r.length || pos + nframes < r.start )
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return 0;
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/* calculate offsets into file and sample buffer */
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nframes_t sofs, /* offset into source */
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ofs, /* offset into buffer */
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cnt; /* number of frames to read */
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cnt = nframes;
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if ( pos < r.start )
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{
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/* region starts somewhere after the beginning of this buffer */
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sofs = 0;
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ofs = r.start - pos;
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cnt -= ofs;
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}
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else
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{
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/* region started before this buffer */
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ofs = 0;
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sofs = pos - r.start;
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}
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if ( ofs >= nframes )
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return 0;
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// const nframes_t start = ofs + r.start + sofs;
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const nframes_t start = r.offset + sofs;
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const nframes_t len = cnt;
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if ( len == 0 )
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return 0;
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/* now that we know how much and where to read, get on with it */
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// printf( "reading region ofs = %lu, sofs = %lu, %lu-%lu\n", ofs, sofs, start, end );
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/* FIXME: keep the declick defults someplace else */
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Fade declick;
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declick.length = 256;
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declick.type = Fade::Sigmoid;
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if ( _loop )
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{
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nframes_t lofs = sofs % _loop;
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nframes_t lstart = r.offset + lofs;
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if ( lofs + len > _loop )
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{
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/* this buffer covers a loop binary */
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/* read the first part */
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cnt = _clip->read( buf + ofs, channel, lstart, len - ( ( lofs + len ) - _loop ) );
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/* read the second part */
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cnt += _clip->read( buf + ofs + cnt, channel, lstart + cnt, len - cnt );
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/* TODO: declick/crossfade transition? */
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assert( cnt == len );
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}
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else
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cnt = _clip->read( buf + ofs, channel, lstart, len );
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/* this buffer is inside declicking proximity to the loop boundary */
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if ( lofs + cnt + declick.length > _loop /* buffer ends within declick length of the end of loop */
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&&
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sofs + declick.length < r.length /* not the last loop */
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)
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{
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/* */
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/* fixme: what if loop is shorter than declick? */
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const nframes_t declick_start = _loop - declick.length;
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/* when the buffer covers the beginning of the
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* declick, how many frames between the beginning of
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* the buffer and the beginning of the declick */
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const nframes_t declick_onset_offset = declick_start > lofs ? declick_start - lofs : 0;
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/* how far into the declick we are */
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const nframes_t declick_offset = lofs > declick_start ? lofs - declick_start : 0;
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/* this is the end side of the loop boundary */
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const nframes_t fl = cnt - declick_onset_offset;
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declick.apply( buf + ofs + declick_onset_offset,
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Fade::Out,
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declick_offset, fl );
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}
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if ( lofs < declick.length /* buffer begins within declick length of beginning of loop */
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&&
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sofs > _loop ) /* not the first loop */
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{
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const nframes_t declick_end = declick.length;
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const nframes_t click_len = lofs + cnt > declick_end ? declick_end - lofs : cnt;
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/* this is the beginning of the loop next boundary */
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declick.apply( buf + ofs, Fade::In, lofs, click_len );
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}
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}
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else
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cnt = _clip->read( buf + ofs, channel, start, len );
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if ( ! cnt )
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return 0;
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/* apply gain */
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buffer_apply_gain_unaligned( buf + ofs, cnt, _scale );
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/* perform declicking if necessary */
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{
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assert( cnt <= nframes );
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Fade fade;
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fade = declick < _fade_in ? _fade_in : declick;
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/* do fade in if necessary */
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if ( sofs < fade.length )
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fade.apply( buf + ofs, Fade::In, sofs, cnt );
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fade = declick < _fade_out ? _fade_out : declick;
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/* do fade out if necessary */
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if ( start + fade.length > r.offset + r.length )
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fade.apply( buf, Fade::Out, ( start + fade.length ) - ( r.offset + r.length ), cnt );
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}
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return cnt;
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}
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/** prepare for capturing */
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void
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Audio_Region::prepare ( void )
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{
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THREAD_ASSERT( Capture );
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DMESSAGE( "Preparing capture region" );
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// log_start();
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}
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class SequenceRedrawRequest {
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public:
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nframes_t start;
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nframes_t length;
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Sequence *sequence;
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};
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static
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void
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sequence_redraw_request_handle ( void *v )
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{
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THREAD_ASSERT(UI);
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SequenceRedrawRequest *o = (SequenceRedrawRequest*)v;
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o->sequence->damage( FL_DAMAGE_USER1, timeline->offset_to_x( o->start ), o->sequence->y(), timeline->ts_to_x( o->length ), o->sequence->h() );
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delete o;
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};
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/** write /nframes/ from /buf/ to source. /buf/ is interleaved and
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must match the channel layout of the write source! */
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nframes_t
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Audio_Region::write ( nframes_t nframes )
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{
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THREAD_ASSERT( Capture );
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if ( 0 == ( timeline->ts_to_x( _range.length ) % 20 ) )
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{
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int W = 20;
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if ( W )
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{
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SequenceRedrawRequest *o = new SequenceRedrawRequest();
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o->sequence = sequence();
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o->start = _range.start + ( _range.length - timeline->x_to_ts( 20 ) );
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o->length = timeline->x_to_ts( 20 );
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Fl::awake(sequence_redraw_request_handle, o);
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}
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}
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_range.length += nframes;
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return nframes;
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}
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/** finalize region capture. Assumes that this *is* a captured region
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and that no other regions refer to the same source */
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bool
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Audio_Region::finalize ( nframes_t frame )
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{
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THREAD_ASSERT( Capture );
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DMESSAGE( "finalizing capture region" );
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_range.length = frame - _range.start;
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_clip->close();
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_clip->open();
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log_create();
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// log_end();
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return true;
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}
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