From 78f8fce7f286fd0c71774e2567404ed51f24fef3 Mon Sep 17 00:00:00 2001 From: Vito Caputo Date: Fri, 26 May 2017 21:51:04 -0700 Subject: *: initial commit of stripped schism stuff Forking schism tracker's IT playback stuff into a little playback library for embedding in demos. --- src/include/disko.h | 136 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 136 insertions(+) create mode 100644 src/include/disko.h (limited to 'src/include/disko.h') diff --git a/src/include/disko.h b/src/include/disko.h new file mode 100644 index 0000000..e7dc14c --- /dev/null +++ b/src/include/disko.h @@ -0,0 +1,136 @@ +/* + * Schism Tracker - a cross-platform Impulse Tracker clone + * copyright (c) 2003-2005 Storlek + * copyright (c) 2005-2008 Mrs. Brisby + * copyright (c) 2009 Storlek & Mrs. Brisby + * copyright (c) 2010-2012 Storlek + * URL: http://schismtracker.org/ + * + * This program 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. + * + * This program 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 this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ +#ifndef __disko_h +#define __disko_h + +#include + + +typedef struct disko disko_t; +struct disko { + // Functions whose implementation depends on the backend in use + // Use disko_write et al. instead of these. + void (*_write)(disko_t *ds, const void *buf, size_t len); + void (*_putc)(disko_t *ds, int c); + void (*_seek)(disko_t *ds, long offset, int whence); + long (*_tell)(disko_t *ds); + + // Temporary filename that's being written to + char tempname[PATH_MAX]; + + // Name to change it to on close (if successful) + char filename[PATH_MAX]; + + // these could be unionized + // file pointer (only exists for disk files) + FILE *file; + // data for memory buffers (no filename/handle) + uint8_t *data; + + // First errno value recorded after something went wrong. + int error; + + /* untouched by diskwriter; driver may use for anything */ + void *userdata; + + // for memory buffers + size_t pos, length, allocated; +}; + +enum { + DW_OK = 1, + DW_ERROR = 0, + DW_NOT_RUNNING = -1, +}; +enum { + DW_SYNC_DONE = 0, + DW_SYNC_ERROR = -1, + DW_SYNC_MORE = 1, +}; + +/* fopen/fclose-ish writeout/finish wrapper that allocates a structure */ +disko_t *disko_open(const char *filename); +/* Close the file. If there was no error writing the file, it is renamed +to the name specified in disko_open; otherwise, the original file is left +intact and the temporary file is deleted. Returns DW_OK on success, +DW_ERROR (and sets errno) if there was a file error. +'backup' parameter: + <1 don't backup + =1 backup to file~ + >1 keep numbered backups to file.n~ +(the semantics of this might change later to allow finer control) */ +int disko_close(disko_t *f, int backup); + +/* alloc/free a memory buffer +if free_buffer is 0, the internal buffer is left alone when deallocating, +so that it can continue to be used later */ +disko_t *disko_memopen(void); +int disko_memclose(disko_t *f, int free_buffer); + + +/* copy a pattern into a sample */ +int disko_writeout_sample(int smpnum, int pattern, int bind); + +/* copy a pattern into multiple samples (split by channel, +and writing into free slots starting at smpnum) */ +int disko_multiwrite_samples(int firstsmp, int pattern); + +/* Wrapper for the above that writes to the current sample, +and with a confirmation dialog if the sample already has data */ +void song_pattern_to_sample(int pattern, int split, int bind); + +/* export the song to a file */ +struct save_format; +int disko_export_song(const char *filename, const struct save_format *format); + +/* call periodically if (status.flags & DISKWRITER_ACTIVE) to write more stuff. +return: DW_SYNC_*, self explanatory */ +int disko_sync(void); + + + +/* For use by the diskwriter drivers: */ + +/* Write data to the file, as in fwrite() */ +void disko_write(disko_t *ds, const void *buf, size_t len); + +/* Write one character (unsigned char, cast to int) */ +void disko_putc(disko_t *ds, int c); + +/* Change file position. This CAN be used to seek past the end, +but be cognizant that random data might exist in the "gap". */ +void disko_seek(disko_t *ds, long pos, int whence); + +/* Get the position, as set by seek */ +long disko_tell(disko_t *ds); + +/* Call this to signal a nonrecoverable error condition. */ +void disko_seterror(disko_t *ds, int err); + +/* ------------------------------------------------------------------------- */ + +/* this call is used by audio/loadsave to send midi data */ +int _disko_writemidi(const void *data, unsigned int len, unsigned int delay); + +#endif + -- cgit v1.2.3