transform: Add struct sr_transform and struct sr_transform_module.

[libsigrok.git] / src / libsigrok-internal.h

diff --git a/src/libsigrok-internal.h b/src/libsigrok-internal.h
index e61fb464d4b7bb8ff4e4bfed4185bae0f4ca252a..14320a753c32db0c404b6ee1709aa28117c5012e 100644 (file)
--- a/src/libsigrok-internal.h
+++ b/src/libsigrok-internal.h
@@ -159,6 +159,7 @@
 /* Portability fixes for FreeBSD. */
 #ifdef __FreeBSD__
 #define LIBUSB_CLASS_APPLICATION 0xfe
+#define libusb_has_capability(x) 0
 #define libusb_handle_events_timeout_completed(ctx, tv, c) \
        libusb_handle_events_timeout(ctx, tv)
 #endif
@@ -237,6 +238,13 @@ struct sr_input_module {
         */
        const char *desc;
 
+       /**
+        * A NULL terminated array of strings containing a list of file name
+        * extensions typical for the input file format, or NULL if there is
+        * no typical extension for this file format.
+        */
+       const char *const *exts;
+
        /**
         * Zero-terminated list of metadata items the module needs to be able
         * to identify an input stream. Can be all-zero, if the module cannot
@@ -363,6 +371,13 @@ struct sr_output_module {
         */
        char *desc;
 
+       /**
+        * A NULL terminated array of strings containing a list of file name
+        * extensions typical for the input file format, or NULL if there is
+        * no typical extension for this file format.
+        */
+       const char *const *exts;
+
        /**
         * Returns a NULL-terminated list of options this module can take.
         * Can be NULL, if the module has no options.
@@ -418,6 +433,93 @@ struct sr_output_module {
        int (*cleanup) (struct sr_output *o);
 };
 
+/** Transform module instance. */
+struct sr_transform {
+       /** A pointer to this transform's module.  */
+       const struct sr_transform_module *module;
+
+       /**
+        * The device for which this transform module is used. This
+        * can be used by the module to find out channel names and numbers.
+        */
+       const struct sr_dev_inst *sdi;
+
+       /**
+        * A generic pointer which can be used by the module to keep internal
+        * state between calls into its callback functions.
+        */
+       void *priv;
+};
+
+struct sr_transform_module {
+       /**
+        * A unique ID for this transform module, suitable for use in
+        * command-line clients, [a-z0-9-]. Must not be NULL.
+        */
+       char *id;
+
+       /**
+        * A unique name for this transform module, suitable for use in GUI
+        * clients, can contain UTF-8. Must not be NULL.
+        */
+       const char *name;
+
+       /**
+        * A short description of the transform module. Must not be NULL.
+        *
+        * This can be displayed by frontends, e.g. when selecting
+        * which transform module(s) to add.
+        */
+       char *desc;
+
+       /**
+        * Returns a NULL-terminated list of options this transform module
+        * can take. Can be NULL, if the transform module has no options.
+        */
+       const struct sr_option *(*options) (void);
+
+       /**
+        * This function is called once, at the beginning of a stream.
+        *
+        * @param t Pointer to the respective 'struct sr_transform'.
+        * @param options Hash table of options for this transform module.
+        *                Can be NULL if no options are to be used.
+        *
+        * @retval SR_OK Success
+        * @retval other Negative error code.
+        */
+       int (*init) (struct sr_transform *t, GHashTable *options);
+
+       /**
+        * This function is passed a pointer to every packet in the data feed.
+        *
+        * It can either return (in packet_out) a pointer to another packet
+        * (possibly the exact same packet it got as input), or NULL.
+        *
+        * @param t Pointer to the respective 'struct sr_transform'.
+        * @param packet_in Pointer to a datafeed packet.
+        * @param packet_out Pointer to the resulting datafeed packet after
+        *                   this function was run. If NULL, the transform
+        *                   module intentionally didn't output a new packet.
+        *
+        * @retval SR_OK Success
+        * @retval other Negative error code.
+        */
+       int (*receive) (const struct sr_transform *t,
+                       struct sr_datafeed_packet *packet_in,
+                       struct sr_datafeed_packet **packet_out);
+
+       /**
+        * This function is called after the caller is finished using
+        * the transform module, and can be used to free any internal
+        * resources the module may keep.
+        *
+        * @retval SR_OK Success
+        * @retval other Negative error code.
+        */
+       int (*cleanup) (struct sr_transform *t);
+};
+
 #ifdef HAVE_LIBUSB_1_0
 /** USB device instance */
 struct sr_usb_dev_inst {
@@ -646,13 +748,18 @@ struct soft_trigger_logic {
        int unitsize;
        int cur_stage;
        uint8_t *prev_sample;
+       uint8_t *pre_trigger_buffer;
+       uint8_t *pre_trigger_head;
+       int pre_trigger_size;
+       int pre_trigger_fill;
 };
 
 SR_PRIV struct soft_trigger_logic *soft_trigger_logic_new(
-               const struct sr_dev_inst *sdi, struct sr_trigger *trigger);
+               const struct sr_dev_inst *sdi, struct sr_trigger *trigger,
+               int pre_trigger_samples);
 SR_PRIV void soft_trigger_logic_free(struct soft_trigger_logic *st);
 SR_PRIV int soft_trigger_logic_check(struct soft_trigger_logic *st, uint8_t *buf,
-               int len);
+               int len, int *pre_trigger_samples);
 
 /*--- hardware/serial.c -----------------------------------------------------*/