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573 lines
14 KiB
573 lines
14 KiB
/*
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* $id$
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*
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* This file is part of WorkMan, the civilized CD player library
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* (c) 1991-1997 by Steven Grimm (original author)
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* (c) by Dirk Försterling (current 'author' = maintainer)
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* The maintainer can be contacted by his e-mail address:
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* milliByte@DeathsDoor.com
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the Free
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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******************************************************************
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*
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* Digital audio manipulator for WorkMan.
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*
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* The CDDA architecture looks like this:
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*
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* WorkMan (or another UI!)
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* ^^^
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* ||| (separate processes connected by pipe)
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* vvv
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* +------------- cddaslave -------------+
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* | | |
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* command module CDDA reader audio output
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* (portable) (per platform) (per platform)
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*
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* This source file has the command module and some of the scaffolding
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* to hold cddaslave together, plus some non-system-dependent audio
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* processing code. Look in plat_*_cdda.c for system-specific stuff.
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*
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*/
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#include "include/wm_cdda.h"
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#ifdef BUILD_CDDA
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static char cddaslave_id[] = "$Id$";
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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#include "include/wm_struct.h"
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#include "include/wm_cdda.h"
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#include "include/wm_platform.h"
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#include "audio/audio.h"
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void send_status(struct cdda_block *);
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#define SEND_ACK(b); { (b)->status |= WMCDDA_ACK; send_status(b); }
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#define SEND_STATUS(b); { (b)->status &= ~WMCDDA_ACK; send_status(b); }
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#define SEND_STATUS_ACK(b, s); { (b)->status = ((s) | WMCDDA_ACK); send_status(b); }
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int receive_command(struct cdda_device *, struct cdda_block *);
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int playing = 0; /* Should the CD be playing now? */
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int pausing = 0;
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/*
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* Loudness setting, plus the floating volume multiplier and decaying-average
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* volume level.
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*/
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int loudness = 0;
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unsigned int volume = 32768;
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unsigned int level;
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/*
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* Playback speed (0 = slow)
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*/
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int speed = 128;
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/*
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* This is non-null if we're saving audio to a file.
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*/
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FILE *output = NULL;
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/*
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* These are driverdependent oops
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*
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*/
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struct audio_oops *oops = NULL;
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/*
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* Audio file header format.
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*/
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typedef unsigned long u_32;
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struct auheader {
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u_32 magic;
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u_32 hdr_size;
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u_32 data_size;
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u_32 encoding;
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u_32 sample_rate;
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u_32 channels;
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};
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/* had to change #ifdef to #if -> see wm_cdda.h */
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#ifdef __FreeBSD__
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/* Phungus not with htonl on FreeBSD */
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#include <sys/param.h>
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#else
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#if WM_BIG_ENDIAN
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# ifndef htonl
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# define htonl(x) (x)
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# endif
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#else
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extern unsigned long htonl(x);
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#endif
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#endif
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void *malloc();
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long cdda_transform();
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/*
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* Send status information upstream.
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*/
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void
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send_status(struct cdda_block *blk)
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{
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DEBUGLOG("send_status, send %i(%s | %s)\n", blk->status,
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gen_status(blk->status & WMCDDA_ACK), gen_status(blk->status & ~WMCDDA_ACK));
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write(1, blk, sizeof(*blk));
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}
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/*
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* Accept a command from our master.
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*
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* The protocol is byte-oriented:
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* PmsfMSFxyz Play from msf to MSF (MSF can be 0,0,0 to play to end)
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* xyz is the msf of the start of this chunk, i.e., the
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* ending boundary for reverse play.
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* S Stop.
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* E Eject. This means we just close the CD device and
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* open it again later.
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* Q Quit.
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* Vn Set volume level (0-255).
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* Bn Set balance level (0-255).
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* EnL Set an equalizer level (n = 0 for bass, 255 for treble)
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* G Get current status.
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* sn Set speed multiplier to n.
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* dn Set direction to forward (n = 0) or reverse.
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* Fllllx... Start saving to a file (length = l, followed by name)
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* F0000 Stop saving.
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* Ln Set loudness level (0-255).
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* A Pause/Resume
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* I Get status, current frame
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*/
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int
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receive_command(struct cdda_device *dev, struct cdda_block* blk)
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{
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unsigned char inbuf[10];
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char *filename;
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int namelen;
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struct auheader hdr;
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if (read(0, inbuf, 1) <= 0) {
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wmcdda_close(dev);
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oops->wmaudio_close();
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/* ERRORLOG("cddaslave: parent died, exit\n");*/
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exit(0);
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}
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DEBUGLOG("cddaslave: CMD %c\n", inbuf[0]);
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switch (inbuf[0]) {
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case 'I':
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if(dev->fd < 0) wmcdda_init(dev, blk);
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SEND_ACK(blk);
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break;
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case 'A': /* pause/resume */
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if(WMCDDA_PLAYING & blk->status) {
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oops->wmaudio_stop();
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SEND_STATUS_ACK(blk, WMCDDA_PAUSED);
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} else if (WMCDDA_PAUSED & blk->status) {
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SEND_STATUS_ACK(blk, WMCDDA_PLAYING);
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} else {
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SEND_ACK(blk);
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}
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break;
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case 'E':
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oops->wmaudio_stop();
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wmcdda_close(dev);
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SEND_ACK(blk);
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break;
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case 'P':
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read(0, inbuf, 9);
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wmcdda_setup(inbuf[0] * 60 * 75 + inbuf[1] * 75 + inbuf[2],
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inbuf[3] * 60 * 75 + inbuf[4] * 75 + inbuf[5],
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inbuf[6] * 60 * 75 + inbuf[7] * 75 + inbuf[8]);
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level = 2500;
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volume = 1 << 15;
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blk->track = -1;
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blk->index = 0;
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blk->minute = inbuf[6];
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blk->second = inbuf[7];
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blk->frame = inbuf[8];
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SEND_STATUS_ACK(blk, WMCDDA_PLAYING);
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break;
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case 'S':
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oops->wmaudio_stop();
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SEND_STATUS_ACK(blk, WMCDDA_STOPPED);
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break;
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case 'B':
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read(0, inbuf, 1);
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if(oops->wmaudio_balance)
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oops->wmaudio_balance(inbuf[0]);
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break;
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case 'V':
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read(0, inbuf, 1);
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if(oops->wmaudio_balance)
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oops->wmaudio_volume(inbuf[0]);
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break;
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case 'G':
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SEND_ACK(blk);
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if(!oops->wmaudio_state || oops->wmaudio_state(blk) == -1) {
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blk->volume = -1;
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blk->balance = 128;
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}
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send_status(blk);
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break;
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case 'Q':
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SEND_ACK(blk);
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wmcdda_close(dev);
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oops->wmaudio_close();
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exit(0);
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/*
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case 's':
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read(0, inbuf, 1);
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speed = inbuf[0];
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wmcdda_speed(speed);
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SEND_STATUS(blk, WMCDDA_ACK);
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break;
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case 'd':
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read(0, inbuf, 1);
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wmcdda_direction(inbuf[0]);
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SEND_STATUS(blk, WMCDDA_ACK);
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break;
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*/
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case 'L':
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read(0, inbuf, 1);
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loudness = inbuf[0];
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SEND_ACK(blk);
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break;
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case 'F':
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read(0, &namelen, sizeof(namelen));
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if (output != NULL) {
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fclose(output);
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output = NULL;
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}
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if (namelen) {
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filename = malloc(namelen + 1);
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if (filename == NULL) {
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perror("cddaslave");
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wmcdda_close(dev);
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oops->wmaudio_close();
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exit(1);
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}
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read(0, filename, namelen);
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filename[namelen] = '\0';
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output = fopen(filename, "w");
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if (output == NULL)
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perror(filename);
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else {
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/* Write an .au file header. */
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hdr.magic = htonl(0x2e736e64);
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hdr.hdr_size = htonl(sizeof(hdr) + 28);
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hdr.data_size = htonl(~0);
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hdr.encoding = htonl(3); /* linear-16 */
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hdr.sample_rate = htonl(44100);
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hdr.channels = htonl(2);
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fwrite(&hdr, sizeof(hdr), 1, output);
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fwrite("Recorded from CD by WorkMan", 28, 1, output);
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}
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free(filename);
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}
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SEND_ACK(blk);
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}
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return(dev->fd);
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}
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/*
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* Transform some CDDA data.
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*/
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long
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wmcdda_transform(unsigned char *rawbuf, long buflen, struct cdda_block *block)
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{
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long i;
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long *buf32 = (long *)rawbuf;
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short *buf16 = (short *)rawbuf;
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int aval;
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/*
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* Loudness transformation. Basically this is a self-adjusting
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* volume control; our goal is to keep the average output level
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* around a certain value (2500 seems to be pleasing.) We do this
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* by maintaining a decaying average of the recent output levels
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* (where "recent" is some fraction of a second.) All output levels
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* are multiplied by the inverse of the decaying average; this has
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* the volume-leveling effect we desire, and isn't too CPU-intensive.
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*
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* This is done by modifying the digital data, rather than adjusting
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* the system volume control, because (at least on some systems)
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* tweaking the system volume can generate little pops and clicks.
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*
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* There's probably a more elegant way to achieve this effect, but
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* what the heck, I never took a DSP class and am making this up as
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* I go along, with a little help from some friends.
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*
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* This is all done with fixed-point math, oriented around powers
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* of two, which with luck will keep the CPU usage to a minimum.
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* More could probably be done, for example using lookup tables to
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* replace multiplies and divides; whether the memory hit (128K
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* for each table) is worthwhile is unclear.
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*/
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if (loudness)
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{
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/* We aren't really going backwards, but i > 0 is fast */
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for (i = buflen / 2; i > 0; i--)
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{
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/*
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* Adjust this sample to the current level.
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*/
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aval = (*buf16 = (((long)*buf16) * volume) >> 15);
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buf16++;
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/*
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* Don't adjust the decaying average for each sample;
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* that just spends CPU time for very little benefit.
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*/
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if (i & 127)
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continue;
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/*
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* We want to use absolute values to compute the
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* decaying average; otherwise it'd sit around 0.
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*/
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if (aval < 0)
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aval = -aval;
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/*
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* Adjust more quickly when we start hitting peaks,
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* or we'll get clipping when there's a sudden loud
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* section after lots of quiet.
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*/
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if (aval & ~8191)
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aval <<= 3;
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/*
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* Adjust the decaying average.
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*/
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level = ((level << 11) - level + aval) >> 11;
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/*
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* Let *really* quiet sounds play softly, or we'll
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* amplify background hiss to full volume and blast
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* the user's speakers when real sound starts up.
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*/
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if (! (level & ~511))
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level = 512;
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/*
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* And adjust the volume setting using the inverse
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* of the decaying average.
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*/
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volume = (2500 << 15) / level;
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}
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}
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if (speed == 128)
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return (buflen);
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/*
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* Half-speed play. Stretch things out.
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*/
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if (speed == 0)
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{
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buflen /= 2; /* Since we're moving 32 bits at a time */
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for (i = buflen - 1; i > 0; i--)
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{
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buf32[i] = buf32[i / 2];
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}
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buflen *= 4; /* 2 for doubling the buffer, 2 from above */
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}
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/*
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* Slow play; can't optimize it as well as half-speed.
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*/
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if (speed && speed < 128)
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{
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int multiplier = ((speed + 128) * 128) / 256;
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int newlen;
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int tally = 0, pos;
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buflen /= 4; /* Get the number of 32-bit values */
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/*
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* Buffer length doubles when speed is 0, stays the same
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* when speed is 128.
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*/
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newlen = (buflen * 128) / multiplier;
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pos = buflen - 1;
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for (i = newlen - 1; i > 0; i--)
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{
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buf32[i] = buf32[pos];
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tally += multiplier;
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if (tally & 128)
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{
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pos--;
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tally ^= 128;
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}
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}
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buflen = newlen * 4;
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}
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return (buflen);
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}
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int main(int argc, char **argv)
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{
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fd_set readfd, dummyfd;
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struct timeval timeout;
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struct cdda_block blockinfo;
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long result;
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int nfds;
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struct cdda_device dev;
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const char *sondsystem;
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const char *sounddevice;
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const char *sounddevicectl;
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memset(&blockinfo, 0, sizeof(struct cdda_block));
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/*
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* Device name should be the command-line argument.
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*/
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if (argc < 2)
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dev.devname = NULL;
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else
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dev.devname = argv[1];
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if (argc < 3)
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sondsystem = "arts";
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else
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sondsystem = argv[2];
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if (argc < 4)
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sounddevice = NULL;
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else
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sounddevice = argv[3];
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if (argc < 5)
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sounddevicectl = NULL;
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else
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sounddevicectl = argv[3];
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DEBUGLOG("cddaslave: called with %s %s %s %s\n",
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dev.devname?dev.devname:"",
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sondsystem?sondsystem:"",
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sounddevice?sounddevice:"",
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sounddevicectl?sounddevicectl:"");
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/*
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* If we're running setuid root, bump up our priority then lose
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* superuser access.
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*/
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nice(-14);
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setgid(getgid());
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setuid(getuid());
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if (geteuid() != getuid())
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return 255;
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FD_ZERO(&dummyfd);
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FD_ZERO(&readfd);
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timerclear(&timeout);
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dev.fd = -1;
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wmcdda_init(&dev, &blockinfo);
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oops = setup_soundsystem(sondsystem, sounddevice, sounddevicectl);
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if (!oops) {
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ERRORLOG("cddaslave: setup_soundsystem failed\n");
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exit(1);
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}
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DEBUGLOG("cddaslave: sent first ACK\n");
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SEND_ACK(&blockinfo);
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/*
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* Accept commands as they come in, and play some sound if we're
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* supposed to be doing that.
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*/
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while (1) {
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FD_SET(0, &readfd);
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/*
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* If we're playing, we don't want select to block. Otherwise,
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* wait a little while for the next command.
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*/
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if (playing)
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timeout.tv_usec = 0;
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else
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timeout.tv_usec = 500000;
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nfds = select(1, &readfd, &dummyfd, &dummyfd, &timeout);
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if (nfds < 0) { /* Broken pipe; our GUI exited. */
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wmcdda_close(&dev);
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oops->wmaudio_close();
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exit(0);
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}
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if (FD_ISSET(0, &readfd)) {
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receive_command(&dev, &blockinfo);
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/*
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* Process all commands in rapid succession, rather
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* than possibly waiting for a CDDA read.
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*/
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continue;
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}
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if ((blockinfo.status & ~WMCDDA_ACK) == WMCDDA_PLAYING) {
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result = wmcdda_read(&dev, &blockinfo);
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if (result <= 0 && blockinfo.status != WMCDDA_DONE) {
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ERRORLOG("cddaslave: wmcdda_read failed\n");
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blockinfo.status = WMCDDA_STOPPED;
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send_status(&blockinfo);
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} else {
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|
result = wmcdda_normalize(&dev, &blockinfo);
|
|
if (output)
|
|
fwrite(dev.buf, result, 1, output);
|
|
|
|
if (oops->wmaudio_play(dev.buf, dev.buflen, &blockinfo)) {
|
|
oops->wmaudio_stop();
|
|
ERRORLOG("cddaslave: wmaudio_play failed\n");
|
|
blockinfo.status = WMCDDA_STOPPED;
|
|
send_status(&blockinfo);
|
|
}
|
|
}
|
|
} else
|
|
send_status(&blockinfo);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#endif /* BUILD_CDDA */
|