srd: Pass metadata to decoders only on SR_DF_HEADER.

[libsigrokdecode.git] / sigrokdecode.h

/*
 * This file is part of the sigrok project.
 *
 * Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de>
 *
 * 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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 */

#ifndef SIGROKDECODE_SIGROKDECODE_H
#define SIGROKDECODE_SIGROKDECODE_H

#include <Python.h> /* First, so we avoid a _POSIX_C_SOURCE warning. */
#include <stdint.h>
#include <glib.h>

#ifdef __cplusplus
extern "C" {
#endif

/*
 * Status/error codes returned by libsigrokdecode functions.
 *
 * All possible return codes of libsigrokdecode functions must be listed here.
 * Functions should never return hardcoded numbers as status, but rather
 * use these #defines instead. All error codes are negative numbers.
 *
 * The error codes are globally unique in libsigrokdecode, i.e. if one of the
 * libsigrokdecode functions returns a "malloc error" it must be exactly the
 * same return value as used by all other functions to indicate "malloc error".
 * There must be no functions which indicate two different errors via the
 * same return code.
 *
 * Also, for compatibility reasons, no defined return codes are ever removed
 * or reused for different #defines later. You can only add new #defines and
 * return codes, but never remove or redefine existing ones.
 */
#define SRD_OK			 0 /**< No error */
#define SRD_ERR			-1 /**< Generic/unspecified error */
#define SRD_ERR_MALLOC		-2 /**< Malloc/calloc/realloc error */
#define SRD_ERR_ARGS		-3 /**< Function argument error */
#define SRD_ERR_PYTHON		-4 /**< Python C API error */
#define SRD_ERR_DECODERS_DIR	-5 /**< Protocol decoder path invalid */

/* TODO: Documentation. */
struct srd_decoder {
	/** The decoder ID. Must be non-NULL and unique for all decoders. */
	char *id;

	/** The (short) decoder name. */
	char *name;

	/** The (long) decoder name. May be NULL. */
	char *longname;

	/** A (short, one-line) description of the decoder. */
	char *desc;

	/** A (long, multi-line) description of the decoder. May be NULL. */
	char *longdesc;

	/** The author of the decoder. May be NULL. */
	char *author;

	/** An email address of the decoder's author. May be NULL. */
	char *email;

	/** The license of the decoder. Valid values: "gplv2+", "gplv3+". */
	char *license;

	/** TODO */
	char *func;

	/** TODO */
	GSList *inputformats;

	/** TODO */
	GSList *outputformats;

	/** TODO */
	PyObject *py_mod;

	/** Python object that performs the decoding */
	PyObject *py_decobj;
};

struct srd_decoder_instance {
	PyObject *py_instance;
};

int srd_init(void);
GSList *srd_list_decoders(void);
struct srd_decoder *srd_get_decoder_by_id(const char *id);
int srd_run_decoder(struct srd_decoder_instance *dec, 
		    uint8_t *inbuf, uint64_t inbuflen,
		    uint8_t **outbuf, uint64_t *outbuflen);
struct srd_decoder_instance *srd_instance_new(const char *id);
int srd_instance_set_probe(struct srd_decoder_instance *di,
				const char *probename, int num);
int srd_instance_start(struct srd_decoder_instance *di,
			const char *driver, int unitsize, uint64_t starttime);
int srd_exit(void);

#ifdef __cplusplus
}
#endif

#endif