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synced 2025-11-05 13:30:02 -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
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@ -23,11 +23,46 @@
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*/
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#include <errno.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include "midifile.h"
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#define DEFAULT_TEMPO 500000 /* 500ms per quarter note (120 BPM) is the default */
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struct midi_track {
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uint16_t id;
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uint8_t *data;
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uint32_t size;
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uint8_t *p;
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int64_t tick;
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uint8_t running_status;
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unsigned int eof:1;
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};
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struct midi_file {
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uint8_t *data;
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size_t size;
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int mode;
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int fd;
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struct midi_file_info info;
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uint32_t length;
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uint32_t tempo;
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uint8_t *p;
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int64_t tick;
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double tick_sec;
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double tick_start;
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struct midi_track tracks[64];
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};
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static inline uint16_t parse_be16(const uint8_t *in)
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{
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return (in[0] << 8) | in[1];
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@ -62,34 +97,14 @@ static int read_mthd(struct midi_file *mf)
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return -EINVAL;
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mf->length = parse_be32(mf->p + 4);
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mf->format = parse_be16(mf->p + 8);
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mf->ntracks = parse_be16(mf->p + 10);
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mf->division = parse_be16(mf->p + 12);
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mf->info.format = parse_be16(mf->p + 8);
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mf->info.ntracks = parse_be16(mf->p + 10);
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mf->info.division = parse_be16(mf->p + 12);
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mf->p += 14;
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return 0;
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}
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int midi_file_init(struct midi_file *mf, const char *mode,
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void *data, size_t size)
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{
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int res;
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spa_zero(*mf);
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mf->data = mf->p = data;
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mf->size = size;
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if ((res = read_mthd(mf)) < 0)
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return res;
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spa_list_init(&mf->tracks);
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mf->tempo = DEFAULT_TEMPO;
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mf->tick = 0;
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return 0;
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}
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static int read_mtrk(struct midi_file *mf, struct midi_track *track)
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{
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if (mf_avail(mf) < 8 ||
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@ -117,6 +132,164 @@ static int parse_varlen(struct midi_file *mf, struct midi_track *tr, uint32_t *r
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return 0;
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}
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static int open_read(struct midi_file *mf, const char *filename, struct midi_file_info *info)
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{
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int res;
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uint16_t i;
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struct stat st;
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if (stat(filename, &st) < 0) {
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res = -errno;
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goto exit;
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}
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mf->size = st.st_size;
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if ((mf->fd = open(filename, O_RDONLY)) < 0) {
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res = -errno;
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goto exit;
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}
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mf->data = mmap(NULL, mf->size, PROT_READ, MAP_SHARED, mf->fd, 0);
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if (mf->data == MAP_FAILED) {
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res = -errno;
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goto exit_close;
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}
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mf->p = mf->data;
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if ((res = read_mthd(mf)) < 0)
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goto exit_unmap;
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mf->tempo = DEFAULT_TEMPO;
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mf->tick = 0;
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for (i = 0; i < mf->info.ntracks; i++) {
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struct midi_track *tr = &mf->tracks[i];
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uint32_t delta_time;
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if ((res = read_mtrk(mf, tr)) < 0)
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goto exit_unmap;
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if ((res = parse_varlen(mf, tr, &delta_time)) < 0)
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goto exit_unmap;
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tr->tick = delta_time;
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tr->id = i;
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}
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mf->mode = 1;
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*info = mf->info;
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return 0;
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exit_unmap:
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munmap(mf->data, mf->size);
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exit_close:
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close(mf->fd);
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exit:
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return res ;
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}
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static int write_headers(struct midi_file *mf)
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{
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uint8_t buf[4];
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struct midi_track *tr = &mf->tracks[0];
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lseek(mf->fd, 0, SEEK_SET);
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write(mf->fd, "MThd", 4);
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buf[0] = mf->length >> 24;
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buf[1] = mf->length >> 16;
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buf[2] = mf->length >> 8;
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buf[3] = mf->length;
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write(mf->fd, buf, 4);
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buf[0] = mf->info.format >> 8;
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buf[1] = mf->info.format;
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write(mf->fd, buf, 2);
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buf[0] = mf->info.ntracks >> 8;
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buf[1] = mf->info.ntracks;
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write(mf->fd, buf, 2);
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buf[0] = mf->info.division >> 8;
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buf[1] = mf->info.division;
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write(mf->fd, buf, 2);
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write(mf->fd, "MTrk", 4);
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buf[0] = tr->size >> 24;
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buf[1] = tr->size >> 16;
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buf[2] = tr->size >> 8;
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buf[3] = tr->size;
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write(mf->fd, buf, 4);
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return 0;
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}
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static int open_write(struct midi_file *mf, const char *filename, struct midi_file_info *info)
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{
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int res;
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if (info->format != 0)
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return -EINVAL;
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if (info->ntracks == 0)
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info->ntracks = 1;
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else if (info->ntracks != 1)
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return -EINVAL;
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if (info->division == 0)
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info->division = 1920;
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if ((mf->fd = open(filename, O_WRONLY | O_CREAT, 0660)) < 0) {
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res = -errno;
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goto exit;
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}
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mf->mode = 2;
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write_headers(mf);
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return 0;
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exit:
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return res;
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}
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struct midi_file *
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midi_file_open(const char *filename, const char *mode, struct midi_file_info *info)
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{
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int res;
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struct midi_file *mf;
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mf = calloc(1, sizeof(struct midi_file));
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if (mf == NULL)
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return NULL;
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if (strcmp(mode, "r") == 0) {
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if ((res = open_read(mf, filename, info)) < 0)
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goto exit_free;
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} else if (strcmp(mode, "w") == 0) {
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if ((res = open_write(mf, filename, info)) < 0)
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goto exit_free;
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} else {
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res = -EINVAL;
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goto exit_free;
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}
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return mf;
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exit_free:
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free(mf);
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errno = -res;
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return NULL;
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}
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int midi_file_close(struct midi_file *mf)
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{
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if (mf->mode == 1) {
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munmap(mf->data, mf->size);
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} else if (mf->mode == 2) {
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write_headers(mf);
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} else
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return -EINVAL;
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close(mf->fd);
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free(mf);
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return 0;
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}
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static int peek_event(struct midi_file *mf, struct midi_track *tr, struct midi_event *event)
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{
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uint8_t *save, status;
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@ -129,8 +302,8 @@ static int peek_event(struct midi_file *mf, struct midi_track *tr, struct midi_e
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save = tr->p;
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status = *tr->p;
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event->track = tr;
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event->sec = mf->tick_sec + ((tr->tick - mf->tick_start) * (double)mf->tempo) / (1000000.0 * mf->division);
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event->track = tr->id;
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event->sec = mf->tick_sec + ((tr->tick - mf->tick_start) * (double)mf->tempo) / (1000000.0 * mf->info.division);
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if ((status & 0x80) == 0) {
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status = tr->running_status;
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@ -185,28 +358,13 @@ static int peek_event(struct midi_file *mf, struct midi_track *tr, struct midi_e
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return 1;
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}
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int midi_file_add_track(struct midi_file *mf, struct midi_track *track)
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{
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int res;
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uint32_t delta_time;
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if ((res = read_mtrk(mf, track)) < 0)
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return res;
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if ((res = parse_varlen(mf, track, &delta_time)) < 0)
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return res;
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track->tick = delta_time;
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spa_list_append(&mf->tracks, &track->link);
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return 0;
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}
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int midi_file_peek_event(struct midi_file *mf, struct midi_event *event)
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{
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struct midi_track *tr, *found = NULL;
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uint16_t i;
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spa_list_for_each(tr, &mf->tracks, link) {
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for (i = 0; i < mf->info.ntracks; i++) {
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tr = &mf->tracks[i];
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if (tr_avail(tr) == 0)
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continue;
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if (found == NULL || tr->tick < found->tick)
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@ -218,9 +376,9 @@ int midi_file_peek_event(struct midi_file *mf, struct midi_event *event)
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return peek_event(mf, found, event);
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}
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int midi_file_consume_event(struct midi_file *mf, struct midi_event *event)
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int midi_file_consume_event(struct midi_file *mf, const struct midi_event *event)
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{
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struct midi_track *tr = event->track;
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struct midi_track *tr = &mf->tracks[event->track];
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uint32_t delta_time;
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int res;
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@ -230,5 +388,20 @@ int midi_file_consume_event(struct midi_file *mf, struct midi_event *event)
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return res;
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tr->tick += delta_time;
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return 0;
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}
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int midi_file_add_event(struct midi_file *mf, const struct midi_event *event)
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{
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struct midi_track *tr;
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spa_return_val_if_fail(event != NULL, -EINVAL);
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spa_return_val_if_fail(mf != NULL, -EINVAL);
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spa_return_val_if_fail(event->track == 0, -EINVAL);
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tr = &mf->tracks[event->track];
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return 0;
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}
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