mirror of
https://gitlab.freedesktop.org/pipewire/pipewire.git
synced 2025-11-03 09:01:54 -05:00
pw-cat: rework midifile a little
Move the code to read and write midi into the midifile helper and simplify things a bit.
This commit is contained in:
Wim Taymans
parent
edbf1ff500
commit
b7dbf4bbc1
3 changed files with 250 additions and 115 deletions
|
|
@ -23,11 +23,46 @@
|
|||
*/
|
||||
|
||||
#include <errno.h>
|
||||
#include <sys/mman.h>
|
||||
#include <sys/stat.h>
|
||||
#include <unistd.h>
|
||||
#include <fcntl.h>
|
||||
|
||||
#include "midifile.h"
|
||||
|
||||
#define DEFAULT_TEMPO 500000 /* 500ms per quarter note (120 BPM) is the default */
|
||||
|
||||
struct midi_track {
|
||||
uint16_t id;
|
||||
|
||||
uint8_t *data;
|
||||
uint32_t size;
|
||||
|
||||
uint8_t *p;
|
||||
int64_t tick;
|
||||
uint8_t running_status;
|
||||
unsigned int eof:1;
|
||||
};
|
||||
|
||||
struct midi_file {
|
||||
uint8_t *data;
|
||||
size_t size;
|
||||
|
||||
int mode;
|
||||
int fd;
|
||||
|
||||
struct midi_file_info info;
|
||||
uint32_t length;
|
||||
uint32_t tempo;
|
||||
|
||||
uint8_t *p;
|
||||
int64_t tick;
|
||||
double tick_sec;
|
||||
double tick_start;
|
||||
|
||||
struct midi_track tracks[64];
|
||||
};
|
||||
|
||||
static inline uint16_t parse_be16(const uint8_t *in)
|
||||
{
|
||||
return (in[0] << 8) | in[1];
|
||||
|
|
@ -62,34 +97,14 @@ static int read_mthd(struct midi_file *mf)
|
|||
return -EINVAL;
|
||||
|
||||
mf->length = parse_be32(mf->p + 4);
|
||||
mf->format = parse_be16(mf->p + 8);
|
||||
mf->ntracks = parse_be16(mf->p + 10);
|
||||
mf->division = parse_be16(mf->p + 12);
|
||||
mf->info.format = parse_be16(mf->p + 8);
|
||||
mf->info.ntracks = parse_be16(mf->p + 10);
|
||||
mf->info.division = parse_be16(mf->p + 12);
|
||||
|
||||
mf->p += 14;
|
||||
return 0;
|
||||
}
|
||||
|
||||
int midi_file_init(struct midi_file *mf, const char *mode,
|
||||
void *data, size_t size)
|
||||
{
|
||||
int res;
|
||||
|
||||
spa_zero(*mf);
|
||||
mf->data = mf->p = data;
|
||||
mf->size = size;
|
||||
|
||||
if ((res = read_mthd(mf)) < 0)
|
||||
return res;
|
||||
|
||||
spa_list_init(&mf->tracks);
|
||||
|
||||
mf->tempo = DEFAULT_TEMPO;
|
||||
mf->tick = 0;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int read_mtrk(struct midi_file *mf, struct midi_track *track)
|
||||
{
|
||||
if (mf_avail(mf) < 8 ||
|
||||
|
|
@ -117,6 +132,164 @@ static int parse_varlen(struct midi_file *mf, struct midi_track *tr, uint32_t *r
|
|||
return 0;
|
||||
}
|
||||
|
||||
static int open_read(struct midi_file *mf, const char *filename, struct midi_file_info *info)
|
||||
{
|
||||
int res;
|
||||
uint16_t i;
|
||||
struct stat st;
|
||||
|
||||
if (stat(filename, &st) < 0) {
|
||||
res = -errno;
|
||||
goto exit;
|
||||
}
|
||||
|
||||
mf->size = st.st_size;
|
||||
|
||||
if ((mf->fd = open(filename, O_RDONLY)) < 0) {
|
||||
res = -errno;
|
||||
goto exit;
|
||||
}
|
||||
|
||||
mf->data = mmap(NULL, mf->size, PROT_READ, MAP_SHARED, mf->fd, 0);
|
||||
if (mf->data == MAP_FAILED) {
|
||||
res = -errno;
|
||||
goto exit_close;
|
||||
}
|
||||
|
||||
mf->p = mf->data;
|
||||
|
||||
if ((res = read_mthd(mf)) < 0)
|
||||
goto exit_unmap;
|
||||
|
||||
mf->tempo = DEFAULT_TEMPO;
|
||||
mf->tick = 0;
|
||||
|
||||
for (i = 0; i < mf->info.ntracks; i++) {
|
||||
struct midi_track *tr = &mf->tracks[i];
|
||||
uint32_t delta_time;
|
||||
|
||||
if ((res = read_mtrk(mf, tr)) < 0)
|
||||
goto exit_unmap;
|
||||
|
||||
if ((res = parse_varlen(mf, tr, &delta_time)) < 0)
|
||||
goto exit_unmap;
|
||||
|
||||
tr->tick = delta_time;
|
||||
tr->id = i;
|
||||
}
|
||||
mf->mode = 1;
|
||||
*info = mf->info;
|
||||
return 0;
|
||||
|
||||
exit_unmap:
|
||||
munmap(mf->data, mf->size);
|
||||
exit_close:
|
||||
close(mf->fd);
|
||||
exit:
|
||||
return res ;
|
||||
}
|
||||
|
||||
static int write_headers(struct midi_file *mf)
|
||||
{
|
||||
uint8_t buf[4];
|
||||
struct midi_track *tr = &mf->tracks[0];
|
||||
|
||||
lseek(mf->fd, 0, SEEK_SET);
|
||||
|
||||
write(mf->fd, "MThd", 4);
|
||||
buf[0] = mf->length >> 24;
|
||||
buf[1] = mf->length >> 16;
|
||||
buf[2] = mf->length >> 8;
|
||||
buf[3] = mf->length;
|
||||
write(mf->fd, buf, 4);
|
||||
buf[0] = mf->info.format >> 8;
|
||||
buf[1] = mf->info.format;
|
||||
write(mf->fd, buf, 2);
|
||||
buf[0] = mf->info.ntracks >> 8;
|
||||
buf[1] = mf->info.ntracks;
|
||||
write(mf->fd, buf, 2);
|
||||
buf[0] = mf->info.division >> 8;
|
||||
buf[1] = mf->info.division;
|
||||
write(mf->fd, buf, 2);
|
||||
|
||||
write(mf->fd, "MTrk", 4);
|
||||
buf[0] = tr->size >> 24;
|
||||
buf[1] = tr->size >> 16;
|
||||
buf[2] = tr->size >> 8;
|
||||
buf[3] = tr->size;
|
||||
write(mf->fd, buf, 4);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int open_write(struct midi_file *mf, const char *filename, struct midi_file_info *info)
|
||||
{
|
||||
int res;
|
||||
|
||||
if (info->format != 0)
|
||||
return -EINVAL;
|
||||
if (info->ntracks == 0)
|
||||
info->ntracks = 1;
|
||||
else if (info->ntracks != 1)
|
||||
return -EINVAL;
|
||||
if (info->division == 0)
|
||||
info->division = 1920;
|
||||
|
||||
if ((mf->fd = open(filename, O_WRONLY | O_CREAT, 0660)) < 0) {
|
||||
res = -errno;
|
||||
goto exit;
|
||||
}
|
||||
mf->mode = 2;
|
||||
|
||||
write_headers(mf);
|
||||
|
||||
return 0;
|
||||
exit:
|
||||
return res;
|
||||
}
|
||||
|
||||
struct midi_file *
|
||||
midi_file_open(const char *filename, const char *mode, struct midi_file_info *info)
|
||||
{
|
||||
int res;
|
||||
struct midi_file *mf;
|
||||
|
||||
mf = calloc(1, sizeof(struct midi_file));
|
||||
if (mf == NULL)
|
||||
return NULL;
|
||||
|
||||
if (strcmp(mode, "r") == 0) {
|
||||
if ((res = open_read(mf, filename, info)) < 0)
|
||||
goto exit_free;
|
||||
} else if (strcmp(mode, "w") == 0) {
|
||||
if ((res = open_write(mf, filename, info)) < 0)
|
||||
goto exit_free;
|
||||
} else {
|
||||
res = -EINVAL;
|
||||
goto exit_free;
|
||||
}
|
||||
return mf;
|
||||
|
||||
exit_free:
|
||||
free(mf);
|
||||
errno = -res;
|
||||
return NULL;
|
||||
}
|
||||
|
||||
int midi_file_close(struct midi_file *mf)
|
||||
{
|
||||
if (mf->mode == 1) {
|
||||
munmap(mf->data, mf->size);
|
||||
} else if (mf->mode == 2) {
|
||||
write_headers(mf);
|
||||
} else
|
||||
return -EINVAL;
|
||||
|
||||
close(mf->fd);
|
||||
free(mf);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int peek_event(struct midi_file *mf, struct midi_track *tr, struct midi_event *event)
|
||||
{
|
||||
uint8_t *save, status;
|
||||
|
|
@ -129,8 +302,8 @@ static int peek_event(struct midi_file *mf, struct midi_track *tr, struct midi_e
|
|||
save = tr->p;
|
||||
status = *tr->p;
|
||||
|
||||
event->track = tr;
|
||||
event->sec = mf->tick_sec + ((tr->tick - mf->tick_start) * (double)mf->tempo) / (1000000.0 * mf->division);
|
||||
event->track = tr->id;
|
||||
event->sec = mf->tick_sec + ((tr->tick - mf->tick_start) * (double)mf->tempo) / (1000000.0 * mf->info.division);
|
||||
|
||||
if ((status & 0x80) == 0) {
|
||||
status = tr->running_status;
|
||||
|
|
@ -185,28 +358,13 @@ static int peek_event(struct midi_file *mf, struct midi_track *tr, struct midi_e
|
|||
return 1;
|
||||
}
|
||||
|
||||
int midi_file_add_track(struct midi_file *mf, struct midi_track *track)
|
||||
{
|
||||
int res;
|
||||
uint32_t delta_time;
|
||||
|
||||
if ((res = read_mtrk(mf, track)) < 0)
|
||||
return res;
|
||||
|
||||
if ((res = parse_varlen(mf, track, &delta_time)) < 0)
|
||||
return res;
|
||||
|
||||
track->tick = delta_time;
|
||||
spa_list_append(&mf->tracks, &track->link);
|
||||
|
||||
return 0;
|
||||
|
||||
}
|
||||
int midi_file_peek_event(struct midi_file *mf, struct midi_event *event)
|
||||
{
|
||||
struct midi_track *tr, *found = NULL;
|
||||
uint16_t i;
|
||||
|
||||
spa_list_for_each(tr, &mf->tracks, link) {
|
||||
for (i = 0; i < mf->info.ntracks; i++) {
|
||||
tr = &mf->tracks[i];
|
||||
if (tr_avail(tr) == 0)
|
||||
continue;
|
||||
if (found == NULL || tr->tick < found->tick)
|
||||
|
|
@ -218,9 +376,9 @@ int midi_file_peek_event(struct midi_file *mf, struct midi_event *event)
|
|||
return peek_event(mf, found, event);
|
||||
}
|
||||
|
||||
int midi_file_consume_event(struct midi_file *mf, struct midi_event *event)
|
||||
int midi_file_consume_event(struct midi_file *mf, const struct midi_event *event)
|
||||
{
|
||||
struct midi_track *tr = event->track;
|
||||
struct midi_track *tr = &mf->tracks[event->track];
|
||||
uint32_t delta_time;
|
||||
int res;
|
||||
|
||||
|
|
@ -230,5 +388,20 @@ int midi_file_consume_event(struct midi_file *mf, struct midi_event *event)
|
|||
return res;
|
||||
|
||||
tr->tick += delta_time;
|
||||
return 0;
|
||||
}
|
||||
|
||||
int midi_file_add_event(struct midi_file *mf, const struct midi_event *event)
|
||||
{
|
||||
struct midi_track *tr;
|
||||
|
||||
spa_return_val_if_fail(event != NULL, -EINVAL);
|
||||
spa_return_val_if_fail(mf != NULL, -EINVAL);
|
||||
spa_return_val_if_fail(event->track == 0, -EINVAL);
|
||||
|
||||
tr = &mf->tracks[event->track];
|
||||
|
||||
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -25,55 +25,30 @@
|
|||
#include <stdio.h>
|
||||
|
||||
#include <spa/utils/defs.h>
|
||||
#include <spa/utils/list.h>
|
||||
|
||||
struct midi_file;
|
||||
|
||||
struct midi_event {
|
||||
struct spa_list link;
|
||||
|
||||
struct midi_track *track;
|
||||
|
||||
uint32_t track;
|
||||
double sec;
|
||||
uint8_t status;
|
||||
uint8_t meta;
|
||||
|
||||
uint8_t *data;
|
||||
uint32_t size;
|
||||
};
|
||||
|
||||
struct midi_track {
|
||||
struct spa_list link;
|
||||
|
||||
uint8_t *data;
|
||||
uint32_t size;
|
||||
|
||||
uint8_t *p;
|
||||
int64_t tick;
|
||||
uint8_t running_status;
|
||||
unsigned int eof:1;
|
||||
};
|
||||
|
||||
struct midi_file {
|
||||
uint8_t *data;
|
||||
size_t size;
|
||||
|
||||
uint32_t length;
|
||||
struct midi_file_info {
|
||||
uint16_t format;
|
||||
uint16_t ntracks;
|
||||
uint16_t division;
|
||||
uint32_t tempo;
|
||||
|
||||
struct spa_list tracks;
|
||||
|
||||
uint8_t *p;
|
||||
int64_t tick;
|
||||
double tick_sec;
|
||||
double tick_start;
|
||||
};
|
||||
|
||||
int midi_file_init(struct midi_file *mf, const char *mode,
|
||||
void *data, size_t size);
|
||||
struct midi_file *
|
||||
midi_file_open(const char *filename, const char *mode, struct midi_file_info *info);
|
||||
|
||||
int midi_file_add_track(struct midi_file *mf, struct midi_track *track);
|
||||
int midi_file_close(struct midi_file *mf);
|
||||
|
||||
int midi_file_peek_event(struct midi_file *mf, struct midi_event *event);
|
||||
int midi_file_consume_event(struct midi_file *mf, struct midi_event *event);
|
||||
int midi_file_consume_event(struct midi_file *mf, const struct midi_event *event);
|
||||
|
||||
int midi_file_add_event(struct midi_file *mf, const struct midi_event *event);
|
||||
|
|
|
|||
|
|
@ -28,8 +28,6 @@
|
|||
#include <errno.h>
|
||||
#include <time.h>
|
||||
#include <math.h>
|
||||
#include <sys/mman.h>
|
||||
#include <sys/stat.h>
|
||||
#include <signal.h>
|
||||
#include <fcntl.h>
|
||||
#include <getopt.h>
|
||||
|
|
@ -147,11 +145,8 @@ struct data {
|
|||
uint64_t clock_time;
|
||||
|
||||
struct {
|
||||
int fd;
|
||||
void *mem;
|
||||
struct stat st;
|
||||
struct midi_file mf;
|
||||
struct midi_track track[64];
|
||||
struct midi_file *file;
|
||||
struct midi_file_info info;
|
||||
} midi;
|
||||
};
|
||||
|
||||
|
|
@ -977,7 +972,7 @@ static int midi_play(struct data *d, void *src, unsigned int n_frames)
|
|||
uint32_t frame;
|
||||
uint8_t *buf;
|
||||
|
||||
res = midi_file_peek_event(&d->midi.mf, &ev);
|
||||
res = midi_file_peek_event(d->midi.file, &ev);
|
||||
if (res <= 0) {
|
||||
if (have_data)
|
||||
break;
|
||||
|
|
@ -1003,50 +998,42 @@ static int midi_play(struct data *d, void *src, unsigned int n_frames)
|
|||
}
|
||||
have_data = true;
|
||||
next:
|
||||
midi_file_consume_event(&d->midi.mf, &ev);
|
||||
midi_file_consume_event(d->midi.file, &ev);
|
||||
}
|
||||
spa_pod_builder_pop(&b, &f);
|
||||
|
||||
return b.state.offset;
|
||||
}
|
||||
|
||||
static int midi_record(struct data *d, void *src, unsigned int n_frames)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int setup_midifile(struct data *data)
|
||||
{
|
||||
int res;
|
||||
uint16_t i;
|
||||
|
||||
if (stat(data->filename, &data->midi.st)) {
|
||||
fprintf(stderr,"error: can't find file '%s': %m\n", data->filename);
|
||||
return -errno;
|
||||
if (data->mode == mode_record) {
|
||||
spa_zero(data->midi.info);
|
||||
data->midi.info.format = 0;
|
||||
data->midi.info.ntracks = 1;
|
||||
data->midi.info.division = 0;
|
||||
}
|
||||
|
||||
if ((data->midi.fd = open(data->filename, O_RDONLY)) < 0) {
|
||||
fprintf(stderr, "error: open '%s' failed : %m\n", data->filename);
|
||||
data->midi.file = midi_file_open(data->filename,
|
||||
data->mode == mode_playback ? "r" : "w",
|
||||
&data->midi.info);
|
||||
if (data->midi.file == NULL) {
|
||||
fprintf(stderr, "error: can't read midi file '%s': %m\n", data->filename);
|
||||
return -errno;
|
||||
}
|
||||
|
||||
data->midi.mem = mmap(NULL, data->midi.st.st_size, PROT_READ, MAP_SHARED, data->midi.fd, 0);
|
||||
if (data->midi.mem == MAP_FAILED) {
|
||||
fprintf(stderr, "error: mmap '%s' failed : %m\n", data->filename);
|
||||
close(data->midi.fd);
|
||||
return -errno;
|
||||
}
|
||||
if ((res = midi_file_init(&data->midi.mf, "r", data->midi.mem, data->midi.st.st_size)) < 0) {
|
||||
fprintf(stderr, "error: can't read midi file '%s': %s\n", data->filename, spa_strerror(res));
|
||||
close(data->midi.fd);
|
||||
return res;
|
||||
}
|
||||
|
||||
if (data->verbose)
|
||||
printf("opened file \"%s\" format %08x ntracks:%d div:%d\n",
|
||||
data->filename,
|
||||
data->midi.mf.format, data->midi.mf.ntracks,
|
||||
data->midi.mf.division);
|
||||
data->midi.info.format, data->midi.info.ntracks,
|
||||
data->midi.info.division);
|
||||
|
||||
for (i = 0; i < data->midi.mf.ntracks; i++) {
|
||||
midi_file_add_track(&data->midi.mf, &data->midi.track[i]);
|
||||
}
|
||||
data->fill = data->mode == mode_playback ? midi_play : midi_play;
|
||||
data->fill = data->mode == mode_playback ? midi_play : midi_record;
|
||||
data->stride = 1;
|
||||
|
||||
return 0;
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue