151 lines
4.2 KiB
C
151 lines
4.2 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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#include "Peak_Server.H"
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#include <stdio.h>
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#include <string.h>
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#include <sys/socket.h>
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/* Peak Server
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The Peak Server streams peak data to any Timeline Editors or other
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clients that ask for it.
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Peak request looks like (in ASCII)
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> read_peaks "foo.wav" fpp start end
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Where "foo.wav" is the base name. (actual filenames may differ if
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the channels of the source are 'broken out')
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Response looks like (in binary)
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> (int)channels (int)length (float)min max min max min max
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> min max min max
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Were length specifies the number of Peaks (min/max pairs) (for each
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channel) The first channel is transmitted first, and any others
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follow.
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*/
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#include "Audio_File.H"
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#include "Peaks.H"
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typedef unsigned long tick_t;
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#define PEAK_PORT 6100
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void
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Peak_Server::handle_new ( int s )
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{
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printf( "new connection\n" );
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}
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void
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Peak_Server::handle_hang_up ( int s )
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{
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printf( "hangup\n" );
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}
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void
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Peak_Server::handle_request ( int s, const char *buf, int l )
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{
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printf( "request: %s", buf );
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char source[512];
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float fpp;
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tick_t start, end;
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enum { GET_INFO, READ_PEAKS } request;
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if ( 1 == sscanf( buf, "get_info \"%[^\"]\"", source ) )
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{
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request = GET_INFO;
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}
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else if ( 4 == sscanf( buf, "read_peaks \"%[^\"]\" %f %lu %lu", source, &fpp, &start, &end ) )
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{
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request = READ_PEAKS;
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}
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else
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{
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const char *err = "error: malformed request\n";
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fprintf( stderr, err );
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send( s, err, strlen( err ), 0 );
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return;
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}
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Audio_File *af = Audio_File::from_file( source );
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if ( ! af )
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{
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const char *err = "error: could not open source\n";
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send( s, err, strlen( err ), 0 );
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return;
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}
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switch ( request )
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{
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case GET_INFO:
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{
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char buf[128];
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snprintf( buf, sizeof( buf ), "length=%lu channels=%d\n", af->length(), af->channels() );
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send( s, buf, strlen( buf ), 0 );
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break;
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}
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case READ_PEAKS:
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{
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int data[2];
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int peaks;
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data[0] = af->channels();
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data[1] = peaks = (end - start) / fpp;
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send( s, &data, sizeof( data ), 0 );
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const Peaks *pk = af->peaks();
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int npeaks = pk->fill_buffer( fpp, start, end );
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int channels = af->channels();
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Peak *pbuf = new Peak[ npeaks * channels ];
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/* deinterlace */
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int k = 0;
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for ( int i = 0; i < channels; i++ )
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for ( int j = i; j < npeaks * channels; j += channels )
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pbuf[ k++ ] = pk->peakbuf()[ j ];
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/* transmit */
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send( s, pbuf, sizeof( Peak ) * npeaks * channels, 0 );
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delete pbuf;
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break;
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}
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}
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// delete af;
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}
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