[xiph-cvs] cvs commit: ogg-tools/omplay .cvsignore COPYING ChangeLog Makefile README midi.c midi.h omplay.c
Jack Moffitt
jack at xiph.org
Sat Sep 22 21:18:34 PDT 2001
jack 01/09/22 21:18:34
Added: omplay .cvsignore COPYING ChangeLog Makefile README midi.c
midi.h omplay.c
Log:
Working Ogg MIDI player.
Revision Changes Path
1.1 ogg-tools/omplay/.cvsignore
Index: .cvsignore
===================================================================
*.o
omplay
1.1 ogg-tools/omplay/COPYING
Index: COPYING
===================================================================
GNU GENERAL PUBLIC LICENSE
Version 2, June 1991
Copyright (C) 1989, 1991 Free Software Foundation, Inc.
59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
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1.1 ogg-tools/omplay/ChangeLog
Index: ChangeLog
===================================================================
omplay 1.0
* First release
1.1 ogg-tools/omplay/Makefile
Index: Makefile
===================================================================
CFLAGS=-O3 -g
LDFLAGS=
LIBS=-logg -lvorbis -lasound
all: omplay
omplay: omplay.o midi.o
$(CC) $(CFLAGS) -o $@ omplay.o midi.o $(LDFLAGS) $(LIBS)
omplay.o: omplay.c
midi.o: midi.c midi.h
.c.o:
$(CC) $(CFLAGS) -c -o $@ $<
clean:
rm -f omplay midi.o omplay.o
1.1 ogg-tools/omplay/README
Index: README
===================================================================
This is omplay, the Ogg MIDI player. It plays files that contain
MIDI and Vorbis substreams (in either order). The files are played
synchronized. It supports pause, stop and fast-forward via status files.
This player is dependent on ALSA (0.9.x+). Currently this code will only
work with CVS versions of ALSA with a few patches. Hopefully these
patches will become part of the stock ALSA.
The patches are included in alsa-cvs.patch.
A test file test.ogg is included which contains test tones in both MIDI and
in Vorbis as well as short musical passages.
1.1 ogg-tools/omplay/midi.c
Index: midi.c
===================================================================
/*****************************************************************
This file is part of omplay.
omplay is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
omplay is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with omplay; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
This code is copyright (c) 2001 by the Xiph.org Foundation
(http://www.xiph.org/).
**********************************************************************/
/* midi.c
**
** Ogg MIDI decode routines
*/
#include <stdio.h>
#include <sys/asoundlib.h>
#include <ogg/ogg.h>
#include <vorbis/codec.h>
#include "midi.h"
int midi_header_init(midi_info_t *mi)
{
memset(mi, 0, sizeof(midi_info_t));
return 0;
}
int midi_header_clear(midi_info_t *mi)
{
if (mi->data != NULL) free(mi->data);
memset(mi, 0, sizeof(midi_info_t));
return 0;
}
int midi_header_set_queue(midi_info_t *mi, int q)
{
mi->q = q;
return 0;
}
int midi_headerin(midi_info_t *mi, ogg_packet *op)
{
int temp;
// parse the packet for the OggMIDI header
// make sure we have enough to read the version
if (op->bytes < 9)
return EHEADER;
if (memcmp(op->packet, "OggMIDI\000", 8) != 0)
return EHEADER;
mi->version = op->packet[8] & 0xFF;
if (mi->version != 0)
return EVERSION;
// version 0 has a 12 byte header; no more no less
if (op->bytes != 12)
return EHEADER;
mi->smtpe = op->packet[9] & 0xFF;
mi->ticks = (op->packet[11] << 8) | op->packet[10];
// set tempo to default
mi->tempo = 500000;
return 0;
}
int midi_packetin(midi_info_t *mi, ogg_packet *op)
{
if (mi->data != NULL) free(mi->data);
mi->data = (unsigned char *)malloc(op->bytes);
mi->size = op->bytes;
mi->pos = 0;
memcpy(mi->data, op->packet, mi->size);
return 0;
}
tatic unsigned long _data_left(midi_info_t *mi)
{
return (mi->size - mi->pos);
}
tatic int _read_byte(midi_info_t *mi)
{
if (mi->pos >= mi->size) return -1;
return mi->data[mi->pos++] & 0xFF;
}
tatic int64_t _read_var_value(midi_info_t *mi)
{
unsigned long stamp = 0;
int byte;
do {
byte = _read_byte(mi);
if (byte == -1) return -1;
stamp <<= 7;
stamp |= byte & 0x7F;
} while ((byte & 0x80) == 0x80);
return stamp;
}
int midi_eventout(midi_info_t *mi, snd_seq_event_t *ev)
{
int64_t stamp, length;
int status, data;
int tempo;
int err;
void *buf;
if (_data_left(mi) == 0) return EDATA;
snd_seq_ev_clear(ev);
snd_seq_ev_set_fixed(ev);
// We know at this point that the entire event
// is within the packet, since it's illegal
// to span packet boundries for events.
// this makes our lives _so_ much easier.
stamp = _read_var_value(mi);
if (stamp < 0) return EEVENT;
mi->time += stamp;
snd_seq_ev_schedule_tick(ev, mi->q, 0, mi->time);
status = _read_byte(mi);
if (status < 0) return EEVENT;
switch (status & 0xF0) {
case 0x80:
ev->type = SND_SEQ_EVENT_NOTEOFF;
ev->data.note.channel = status & 0x0F;
data = _read_byte(mi);
if (data < 0) return EEVENT;
ev->data.note.note = data & 0x7F;
data = _read_byte(mi);
if (data < 0) return EEVENT;
ev->data.note.velocity = data & 0x7F;
break;
case 0x90:
ev->type = SND_SEQ_EVENT_NOTEON;
ev->data.note.channel = status & 0x0F;
data = _read_byte(mi);
if (data < 0) return EEVENT;
ev->data.note.note = data & 0x7F;
data = _read_byte(mi);
if (data < 0) return EEVENT;
ev->data.note.velocity = data & 0x7F;
break;
case 0xA0:
ev->type = SND_SEQ_EVENT_KEYPRESS;
ev->data.note.channel = status & 0x0F;
data = _read_byte(mi);
if (data < 0) return EEVENT;
ev->data.note.note = data & 0x7F;
data = _read_byte(mi);
if (data < 0) return EEVENT;
ev->data.note.velocity = data & 0x7F;
break;
case 0xB0:
ev->type = SND_SEQ_EVENT_CONTROLLER;
ev->data.control.channel = status & 0x0F;
data = _read_byte(mi);
if (data < 0) return EEVENT;
ev->data.control.param = data & 0x7F;
data = _read_byte(mi);
if (data < 0) return EEVENT;
ev->data.control.value = data & 0x7F;
break;
case 0xC0:
ev->type = SND_SEQ_EVENT_PGMCHANGE;
ev->data.control.channel = status & 0x0F;
data = _read_byte(mi);
if (data < 0) return EEVENT;
ev->data.control.value = data & 0x7F;
break;
case 0xD0:
ev->type = SND_SEQ_EVENT_CHANPRESS;
ev->data.control.channel = status & 0x0F;
data = _read_byte(mi);
if (data < 0 ) return EEVENT;
ev->data.control.value = data & 0x7F;
break;
case 0xE0:
ev->type = SND_SEQ_EVENT_PITCHBEND;
ev->data.control.channel = status & 0x0F;
data = _read_byte(mi);
if (data < 0) return EEVENT;
ev->data.control.param = data & 0x7F;
data = _read_byte(mi);
if (data < 0) return EEVENT;
ev->data.control.value = data & 0x7F;
break;
case 0xF0:
// these events are special
// we should not send only the tempo changes
// and sysex events
switch (status & 0xFF) {
case 0xF0:
ev->type = SND_SEQ_EVENT_SYSEX;
length = _read_var_value(mi);
if (length < 1) return EEVENT;
if (_data_left(mi) < length) return EEVENT;
ev->data.ext.len = length;
buf = (void *)malloc(length);
if (buf == NULL) return EMALLOC;
memcpy(buf, &mi->data[mi->pos], length);
snd_seq_ev_set_variable(ev, length, buf);
mi->pos += length;
break;
case 0xFF:
data = _read_byte(mi);
if (data < 0) return EEVENT;
if (data == 0x51) {
length = _read_var_value(mi);
if (length != 3) return EEVENT;
if (_data_left(mi) < length) return EEVENT;
ev->type = SND_SEQ_EVENT_TEMPO;
ev->data.queue.queue = mi->q;
ev->data.queue.param.value = (mi->data[mi->pos] << 16) | (mi->data[mi->pos+1] << 8) | (mi->data[mi->pos+2]);
mi->pos += length;
} else {
snd_seq_ev_clear(ev);
// skip this event
length = _read_var_value(mi);
if (length < 0) return EEVENT;
if (_data_left(mi) < length) return EEVENT;
mi->pos += length;
}
break;
default:
return EEVENT;
}
break;
default:
return EEVENT;
}
return 0;
}
1.1 ogg-tools/omplay/midi.h
Index: midi.h
===================================================================
/*****************************************************************
This file is part of omplay.
omplay is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
omplay is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with omplay; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
This code is copyright (c) 2001 by the Xiph.org Foundation
(http://www.xiph.org/).
**********************************************************************/
/* midi.h
**
** Ogg MIDI decode routines header file
*/
#ifndef __MIDI_H__
#define __MIDI_H__
#include <ogg/ogg.h>
#include <sys/asoundlib.h>
typedef struct {
int version;
int smtpe;
int ticks;
u_int64_t time;
unsigned long tempo;
unsigned long pos;
unsigned long size;
unsigned char *data;
int q;
} midi_info_t;
int midi_header_init(midi_info_t *mi);
int midi_header_clear(midi_info_t *mi);
int midi_header_set_queue(midi_info_t *mi, int q);
int midi_headerin(midi_info_t *mi, ogg_packet *op);
int midi_packetin(midi_info_t *mi, ogg_packet *op);
int midi_eventout(midi_info_t *mi, snd_seq_event_t *ev);
#define EDATA -1
#define EHEADER -2
#define EVERSION -3
#define EEVENT -4
#define EMALLOC -5
#endif /* __MIDI_H__ */
1.1 ogg-tools/omplay/omplay.c
Index: omplay.c
===================================================================
/*****************************************************************
This file is part of omplay.
omplay is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
omplay is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with omplay; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
This code is copyright (c) 2001 by the Xiph.org Foundation
(http://www.xiph.org/).
**********************************************************************/
/* omplay.c
**
** main program for omplay, the Ogg MIDI player
*/
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/asoundlib.h>
#include <ogg/ogg.h>
#include <vorbis/codec.h>
#include "midi.h"
#define STATUS_FILE_PLAY "status.PLAY"
#define STATUS_FILE_PAUSE "status.PAUSE"
#define STATUS_FILE_FFWD "status.FFWD"
#define FFWD_SPEED 4
typedef struct status_file_tag
{
int fd;
char *filemap;
size_t len;
int status;
} status_file_t;
typedef struct device_tag
{
// settings
char *pcm_device;
snd_seq_addr_t seq_addr;
// device handles
snd_pcm_t *pcmhandle;
snd_seq_t *seqhandle;
// audio device stuff
snd_pcm_hw_params_t *hwparams;
snd_pcm_sw_params_t *swparams;
snd_pcm_info_t *pcminfo;
snd_pcm_status_t *pcmstat;
int card;
int device;
int subdevice;
// midi device stuff
int q;
int srcport;
FILE *fp;
ogg_sync_state oy;
ogg_stream_state *os_v;
ogg_stream_state *os_m;
int midi_serialno;
int vorbis_serialno;
midi_info_t mi;
vorbis_info vi;
vorbis_comment vc;
vorbis_dsp_state vd;
vorbis_block vb;
// status files
status_file_t play;
status_file_t pause;
status_file_t ffwd;
int fast_forwarding;
int verbose;
} device_t;
device_t device;
int open_devices(void)
{
int err;
err = snd_pcm_open(&device.pcmhandle, device.pcm_device, SND_PCM_STREAM_PLAYBACK, 0);
if (err < 0) return err;
err = snd_seq_open(&device.seqhandle, "hw", SND_SEQ_OPEN_DUPLEX, 0);
if (err < 0) {
snd_pcm_close(device.pcmhandle);
return err;
}
return err;
}
void close_devices(void)
{
snd_seq_free_queue(device.seqhandle, device.q);
snd_seq_close(device.seqhandle);
snd_pcm_close(device.pcmhandle);
}
int configure_audio_device(void)
{
int err;
// hardware parameters
snd_pcm_hw_params_malloc(&device.hwparams);
err = snd_pcm_hw_params_any(device.pcmhandle, device.hwparams);
if (err < 0) return err;
err = snd_pcm_hw_params_set_access(device.pcmhandle, device.hwparams,
SND_PCM_ACCESS_RW_INTERLEAVED);
if (err < 0) return err;
err = snd_pcm_hw_params_set_format(device.pcmhandle, device.hwparams,
SND_PCM_FORMAT_S16_LE);
if (err < 0) return err;
err = snd_pcm_hw_params_set_channels(device.pcmhandle, device.hwparams,
device.vi.channels);
if (err < 0) return err;
err = snd_pcm_hw_params_set_rate_near(device.pcmhandle, device.hwparams,
device.vi.rate, 0);
if (err < 0) return err;
err = snd_pcm_hw_params_set_period_size(device.pcmhandle, device.hwparams,
32, 0);
if (err < 0) return err;
err = snd_pcm_hw_params_set_periods(device.pcmhandle, device.hwparams,
100, 0);
if (err < 0) return err;
err = snd_pcm_hw_params(device.pcmhandle, device.hwparams);
if (err < 0) return err;
return 0;
// software parameters
snd_pcm_sw_params_malloc(&device.swparams);
err = snd_pcm_sw_params_set_xfer_align(device.pcmhandle, device.swparams, 1);
if (err < 0) return err;
err = snd_pcm_sw_params(device.pcmhandle, device.swparams);
if (err < 0) return err;
return 0;
}
int configure_midi_device(void)
{
int err;
device.q = snd_seq_alloc_queue(device.seqhandle);
err = snd_seq_create_simple_port(device.seqhandle, NULL,
SND_SEQ_PORT_CAP_WRITE |
SND_SEQ_PORT_CAP_SUBS_WRITE |
SND_SEQ_PORT_CAP_READ,
SND_SEQ_PORT_TYPE_MIDI_GENERIC);
if (err < 0) {
snd_seq_free_queue(device.seqhandle, device.q);
return err;
}
device.srcport = err;
err = snd_seq_connect_to(device.seqhandle, device.srcport,
device.seq_addr.client, device.seq_addr.port);
if (err < 0) {
snd_seq_free_queue(device.seqhandle, device.q);
return err;
}
return 0;
}
int set_midi_tempo(void)
{
int err;
snd_seq_queue_tempo_t *qtempo;
snd_seq_queue_tempo_alloca(&qtempo);
snd_seq_queue_tempo_set_ppq(qtempo, device.mi.ticks);
snd_seq_queue_tempo_set_tempo(qtempo, device.mi.tempo);
err = snd_seq_set_queue_tempo(device.seqhandle, device.q, qtempo);
if (err < 0) {
printf("Error setting queue tempo\n");
snd_seq_free_queue(device.seqhandle, device.q);
return err;
}
return 0;
}
int sync_devices(void)
{
int err;
snd_seq_queue_timer_t *qt;
snd_timer_id_t *qtid;
// get pcm device information
snd_pcm_info_malloc(&device.pcminfo);
err = snd_pcm_info(device.pcmhandle, device.pcminfo);
if (err < 0) return err;
err = snd_pcm_info_get_card(device.pcminfo);
if (err < 0) return err;
device.card = err;
err = snd_pcm_info_get_device(device.pcminfo);
if (err < 0) return err;
device.device = err;
err = snd_pcm_info_get_subdevice(device.pcminfo);
if (err < 0) return err;
device.subdevice = err << 1;
if (device.verbose >= 1)
printf("using card %d, device %d, subdev %d\n", device.card, device.device, device.subdevice);
snd_pcm_status_malloc(&device.pcmstat);
// setup the queue timer
snd_seq_queue_timer_alloca(&qt);
snd_timer_id_alloca(&qtid);
err = snd_seq_get_queue_timer(device.seqhandle, device.q, qt);
if (err < 0) {
return err;
}
snd_timer_id_set_class(qtid, SND_TIMER_CLASS_PCM);
snd_timer_id_set_sclass(qtid, SND_TIMER_SCLASS_NONE);
snd_timer_id_set_card(qtid, device.card);
snd_timer_id_set_device(qtid, device.device);
snd_timer_id_set_subdevice(qtid, device.subdevice);
snd_seq_queue_timer_set_type(qt, SND_SEQ_TIMER_ALSA);
snd_seq_queue_timer_set_id(qt, qtid);
snd_seq_set_queue_timer(device.seqhandle, device.q, qt);
return 0;
}
void open_file(char *filename)
{
int numpages = 0;
ogg_stream_state *temp;
ogg_page og;
int err = 0;
ogg_packet op;
int bytes;
int serialno;
int i;
char *buffer;
char buf[1024];
// open the file
device.fp = fopen(filename, "r");
if (device.fp == NULL) {
printf("Could not open file %s.\n", filename);
close_devices();
exit(1);
}
// setup sync and stream states
ogg_sync_init(&device.oy);
device.os_m = (ogg_stream_state *)malloc(sizeof(ogg_stream_state));
device.os_v = (ogg_stream_state *)malloc(sizeof(ogg_stream_state));
// get the headers
while (!feof(device.fp) && numpages < 2) {
while (numpages < 2 && (err = ogg_sync_pageout(&device.oy, &og)) == 1) {
// play stuff here
if (numpages == 0) {
ogg_stream_init(device.os_v, ogg_page_serialno(&og));
device.vorbis_serialno = ogg_page_serialno(&og);
if (ogg_stream_pagein(device.os_v, &og) < 0) {
printf("Error reading first page\n");
close_devices();
exit(1);
}
}
if (numpages == 1) {
ogg_stream_init(device.os_m, ogg_page_serialno(&og));
device.midi_serialno = ogg_page_serialno(&og);
if (ogg_stream_pagein(device.os_m, &og) < 0) {
printf("Error reading second page\n");
close_devices();
exit(1);
}
}
numpages++;
}
if (err < 0) break;
bytes = fread(buf, 1, 1024, device.fp);
buffer = ogg_sync_buffer(&device.oy, bytes);
memcpy(buffer, buf, bytes);
ogg_sync_wrote(&device.oy, bytes);
}
if (numpages != 2) {
printf("Couldn't read headers.\n");
close_devices();
exit(1);
}
// first try to verify os_v as a vorbis stream.
vorbis_info_init(&device.vi);
vorbis_comment_init(&device.vc);
if (ogg_stream_packetpeek(device.os_v, &op) < 0) {
printf("Error reading intial header packet\n");
close_devices();
exit(1);
}
if (vorbis_synthesis_headerin(&device.vi, &device.vc, &op) < 0) {
// this is not the vorbis stream
// so swap the stream states
temp = device.os_v;
device.os_v = device.os_m;
device.os_m = temp;
serialno = device.vorbis_serialno;
device.vorbis_serialno = device.midi_serialno;
device.midi_serialno = serialno;
// and try again
if (ogg_stream_packetout(device.os_v, &op) < 0) {
printf("Error reading intial header packet for Vorbis\n");
close_devices();
exit(1);
}
if (vorbis_synthesis_headerin(&device.vi, &device.vc, &op) < 0) {
printf("No vorbis stream found.\n");
close_devices();
exit(1);
}
} else {
ogg_stream_packetout(device.os_v, &op);
}
// at this point we've verified vorbis, and os_m should point to the midi stream
// but we need to verify it
if (ogg_stream_packetout(device.os_m, &op) < 0) {
printf("Error reading intial header packet for MIDI.\n");
close_devices();
exit(1);
}
midi_header_init(&device.mi);
midi_header_set_queue(&device.mi, device.q);
if (midi_headerin(&device.mi, &op) < 0) {
printf("No MIDI stream found.\n");
close_devices();
exit(1);
}
// finish reading vorbis headers
i = 0;
while (i < 2) {
while (i < 2) {
err = ogg_sync_pageout(&device.oy, &og);
if (err == 0) break; // need more data
if (err == 1) {
if (ogg_page_serialno(&og) == device.midi_serialno) {
// got a midi page
ogg_stream_pagein(device.os_m, &og);
break;
}
ogg_stream_pagein(device.os_v, &og);
while (i < 2) {
err = ogg_stream_packetout(device.os_v, &op);
if (err == 0) break;
if (err < 0) {
printf("Corrupt Vorbis headers.\n");
close_devices();
exit(1);
}
vorbis_synthesis_headerin(&device.vi, &device.vc, &op);
i++;
}
}
}
buffer = ogg_sync_buffer(&device.oy, 1024);
bytes = fread(buffer, 1, 1024, device.fp);
if (bytes == 0 && i < 2) {
printf("Premature end of file.\n");
close_devices();
exit(1);
}
ogg_sync_wrote(&device.oy, bytes);
}
vorbis_synthesis_init(&device.vd, &device.vi);
vorbis_block_init(&device.vd, &device.vb);
}
void close_file(void)
{
midi_header_clear(&device.mi);
vorbis_comment_clear(&device.vc);
vorbis_info_clear(&device.vi);
ogg_stream_clear(device.os_v);
ogg_stream_clear(device.os_m);
free(device.os_v);
free(device.os_m);
ogg_sync_clear(&device.oy);
fclose(device.fp);
}
void start_queue(void)
{
snd_seq_event_t ev;
// snd_seq_ev_set_queue_pos_tick(&ev, device.q, 0);
snd_seq_ev_clear(&ev);
snd_seq_ev_schedule_tick(&ev, device.q, 0, 0);
ev.type = SND_SEQ_EVENT_NOTE;
ev.data.note.note = 44;
ev.data.note.velocity = 0;
ev.data.note.duration = 120;
ev.source.port = device.srcport;
ev.dest = device.seq_addr;
snd_seq_event_output(device.seqhandle, &ev);
snd_seq_drain_output(device.seqhandle);
}
tatic int64_t samples_played = 0;
void decode_midi_packet(ogg_packet *op)
{
snd_seq_event_t ev;
int err, result;
snd_seq_queue_status_t *qs;
snd_seq_queue_status_alloca(&qs);
// submit packet
midi_packetin(&device.mi, op);
while ((err = midi_eventout(&device.mi, &ev)) == 0) {
snd_pcm_status(device.pcmhandle, device.pcmstat);
snd_seq_get_queue_status(device.seqhandle, device.q, qs);
if (ev.type == 0) {
continue;
}
if (ev.type == SND_SEQ_EVENT_TEMPO) {
if (device.verbose >= 2)
printf("Changing tempo (us/beat) to: %d\n", ev.data.queue.param.value);
device.mi.tempo = ev.data.queue.param.value;
snd_seq_change_queue_tempo(device.seqhandle, device.q,
ev.data.queue.param.value, NULL);
continue;
}
ev.dest = device.seq_addr;
ev.source.port = device.srcport;
result = snd_seq_event_output(device.seqhandle, &ev);
if (result < 0) printf("Event output result = %d\n", result);
snd_seq_drain_output(device.seqhandle);
}
if (err < 0 && err != EDATA) {
printf("MIDI packet decoding error (%d).\n", err);
close_devices();
exit(1);
}
}
void decode_vorbis_packet(ogg_packet *op)
{
float **pcm;
int samples;
ogg_int16_t convbuffer[4096];
int convsize = 4096 / device.vi.channels;
int i, err;
unsigned long count, pos;
snd_seq_queue_status_t *qs;
snd_seq_queue_status_alloca(&qs);
if (vorbis_synthesis(&device.vb, op) == 0)
vorbis_synthesis_blockin(&device.vd, &device.vb);
while ((samples = vorbis_synthesis_pcmout(&device.vd, &pcm)) > 0) {
int j;
int clipflag = 0;
int bout = (samples < convsize ? samples : convsize);
for (i = 0; i < device.vi.channels; i++) {
ogg_int16_t *ptr = convbuffer+1;
float *mono = pcm[i];
for (j = 0; j < bout; j++) {
int val = mono[j] * 32767.f;
if (val > 32767) {
val = 32767;
clipflag = 1;
}
if (val < -32768) {
val = -32768;
clipflag = 1;
}
*ptr = val;
ptr += device.vi.channels;
}
}
// write data
if (!device.fast_forwarding) {
count = bout;
} else {
count = bout / FFWD_SPEED;
for (i = 0; i < count; i++) {
for (j = 0; j < device.vi.channels; j++) {
convbuffer[i*device.vi.channels + j] = convbuffer[i*FFWD_SPEED*device.vi.channels + j];
}
}
}
pos = 0;
while (1) {
do {
err = snd_pcm_writei(device.pcmhandle, &convbuffer[pos], count);
if (err > 0) {
if (device.fast_forwarding)
samples_played += err * FFWD_SPEED;
else
samples_played += err;
count -= err;
pos += err*2;
}
} while (count > 0 && (err > 0 || err == -EAGAIN));
if (err == -EPIPE) {
if (device.verbose >= 1)
printf("audio underrun\n");
snd_pcm_prepare(device.pcmhandle);
} else {
break;
}
}
snd_pcm_status(device.pcmhandle, device.pcmstat);
snd_seq_get_queue_status(device.seqhandle, device.q, qs);
if (device.verbose >= 3)
printf("queue is at %d, samples_played == %lld\n", snd_seq_queue_status_get_tick_time(qs), samples_played - snd_pcm_status_get_delay(device.pcmstat));
vorbis_synthesis_read(&device.vd, bout);
}
}
ogg_page *copy_page(ogg_page *page)
{
ogg_page *og;
og = (ogg_page *)malloc(sizeof(ogg_page));
og->header_len = page->header_len;
og->body_len = page->body_len;
og->header = (char *)malloc(og->header_len);
og->body = (char *)malloc(og->body_len);
memcpy(og->header, page->header, og->header_len);
memcpy(og->body, page->body, og->body_len);
return og;
}
int init_status_file(status_file_t *sf, char *name, char defval)
{
/* Create/open the file */
sf->fd = open(name, O_RDWR | O_CREAT);
if (sf->fd < 0) return -1;
/* Map the file to memory */
sf->filemap = mmap(0, 1, PROT_READ | PROT_WRITE, MAP_SHARED, sf->fd, 0);
if (sf->filemap < 0) {
close(sf->fd);
return -1;
}
/* Initialize default value */
sf->filemap[0] = defval;
/* Flush to file and update other mappings */
if (msync(sf->filemap, 1, MS_SYNC | MS_INVALIDATE) < 0) {
munmap(sf->filemap, 1);
close(sf->fd);
return -1;
}
sf->status = (defval != '0');
return 0;
}
int setup_status_files(void)
{
if (init_status_file(&device.play, STATUS_FILE_PLAY, '1') != 0) {
printf("Could not initialize status file %s\n", STATUS_FILE_PLAY);
return -1;
}
if (init_status_file(&device.pause, STATUS_FILE_PAUSE, '0') != 0) {
printf("Could not initialize status file %s\n", STATUS_FILE_PAUSE);
return -1;
}
if (init_status_file(&device.ffwd, STATUS_FILE_FFWD, '0') != 0) {
printf("Could not initialize status file %s\n", STATUS_FILE_FFWD);
return -1;
}
return 0;
}
void update_status(void)
{
device.play.status = (device.play.filemap[0] != '0');
device.pause.status = (device.pause.filemap[0] != '0');
device.ffwd.status = (device.ffwd.filemap[0] != '0');
}
void close_status_files(void)
{
munmap(device.play.filemap, 1);
munmap(device.pause.filemap, 1);
munmap(device.ffwd.filemap, 1);
close(device.play.fd);
close(device.pause.fd);
close(device.ffwd.fd);
}
int main(int argc, char **argv)
{
int err;
ogg_page og;
ogg_packet op;
int eos = 0;
int serialno;
unsigned long bytes;
char *buffer;
snd_seq_timestamp_t ts;
snd_seq_event_t ev;
int c;
int use_status_files = 0;
ogg_page *buffered_page = NULL;
memset(&ts, 0, sizeof(snd_seq_timestamp_t));
device.pcm_device = "default";
device.seq_addr.client = 64;
device.seq_addr.port = 0;
device.fast_forwarding = 0;
device.play.status = 1;
device.pause.status = 0;
device.ffwd.status = 0;
device.verbose = 0;
while ((c = getopt(argc, argv, "D:p:sv")) != -1) {
switch (c) {
case 'D':
device.pcm_device = optarg;
break;
case 'p':
snd_seq_parse_address(NULL, &device.seq_addr, optarg);
break;
case 's':
use_status_files = 1;
break;
case 'v':
device.verbose++;
break;
default:
fprintf(stderr, "invalid options %c\n", c);
return 1;
}
}
open_file(argv[optind]);
err = open_devices();
if (err < 0) {
printf("Coudln't open devices\n");
return -1;
}
err = configure_audio_device();
if (err < 0) {
printf("Couldn't configure audio device\n");
close_devices();
return -1;
}
err = configure_midi_device();
if (err < 0) {
printf("Couldn't configure midi device\n");
close_devices();
return -1;
}
err = sync_devices();
if (err < 0) {
printf("Could not sync devices\n");
close_devices();
return -1;
}
if (use_status_files) {
err = setup_status_files();
if (err < 0) {
printf("Could not open/initialize status files\n");
close_devices();
return -1;
}
}
err = set_midi_tempo();
if (err < 0) {
printf("Could not set midi tempo\n");
close_devices();
return -1;
}
snd_seq_start_queue(device.seqhandle, device.q, 0);
start_queue();
/****** GUTS *********/
// decode any midi packets that were queued
while (1) {
err = ogg_stream_packetout(device.os_m, &op);
if (err == 0) break; // need more data
if (err > 0) {
// we have a packet!
decode_midi_packet(&op);
}
}
// decode any vorbis packets tthat were queued
while (1) {
err = ogg_stream_packetout(device.os_v, &op);
if (err == 0) break; // need more data
if (err > 0) {
// we have a packet!
decode_vorbis_packet(&op);
}
}
// PLAYBACK :)
while (!eos && device.play.status) {
/* Pause if we're supposed to */
while (device.pause.status) {
usleep(10000);
update_status();
}
/* Handle fast foward */
if (device.ffwd.status && !device.fast_forwarding) {
// start fast forward
device.fast_forwarding = 1;
snd_seq_change_queue_tempo(device.seqhandle, device.q, device.mi.tempo / FFWD_SPEED, NULL);
snd_seq_drain_output(device.seqhandle);
} else if (!device.ffwd.status && device.fast_forwarding) {
// stop fast forward
device.fast_forwarding = 0;
snd_seq_ev_clear(&ev);
snd_pcm_status(device.pcmhandle, device.pcmstat);
snd_seq_change_queue_tempo(device.seqhandle, device.q, device.mi.tempo, NULL);
snd_seq_ev_set_queue_pos_tick(&ev, device.q, (1000000 * (samples_played - snd_pcm_status_get_delay(device.pcmstat)) / 44100) /
((double)device.mi.tempo / (double)device.mi.ticks));
snd_seq_event_output_direct(device.seqhandle, &ev);
snd_seq_drain_output(device.seqhandle);
}
while (!eos && device.play.status) {
err = ogg_sync_pageout(&device.oy, &og);
if (err == 0) break; // need more data
if (err < 0) {
printf("Corrupt or missing data in bitstream.\n");
close_devices();
exit(1);
}
serialno = ogg_page_serialno(&og);
if (serialno == device.midi_serialno) {
ogg_stream_pagein(device.os_m, &og);
} else if (serialno == device.vorbis_serialno) {
if (buffered_page == NULL) {
buffered_page = copy_page(&og);
} else {
ogg_stream_pagein(device.os_v, buffered_page);
free(buffered_page->header);
free(buffered_page->body);
free(buffered_page);
buffered_page = copy_page(&og);
}
} else {
printf("Got a foreign page.\n");
close_devices();
exit(1);
}
while (1) {
if (serialno == device.midi_serialno) {
err = ogg_stream_packetout(device.os_m, &op);
} else {
err = ogg_stream_packetout(device.os_v, &op);
}
if (err == 0) break; // need more data
if (err > 0) {
// we have a packet!
if (serialno == device.midi_serialno) {
decode_midi_packet(&op);
} else {
decode_vorbis_packet(&op);
}
}
}
// NOTE: this is wrong. we should wait for _both_ eos's
if (ogg_page_eos(&og)) eos = 1;
}
if (!eos && device.play.status) {
buffer = ogg_sync_buffer(&device.oy, 1024);
bytes = fread(buffer, 1, 1024, device.fp);
ogg_sync_wrote(&device.oy, bytes);
if (bytes == 0) eos = 1;
}
if (use_status_files) update_status();
}
close_file();
if (use_status_files) close_status_files();
snd_seq_stop_queue(device.seqhandle, device.q, 0);
close_devices();
return 0;
}
--- >8 ----
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