Pass metadata to PDs only at runtime, not at decoder start

The SRD_CONF_NUM_PROBES metadata key was removed. It wasn't actually
used for anything, since this is trivially available via the configured
(or default) probe list.

The SRD_CONF_UNITSIZE key was removed. The unit size is instead derived
from the probe list: the number of probes packed into the least amount
of space possible defines the unit size.

PD changes:
* The start() method no longer takes a 'metadata' parameter.
* Metadata now comes in only via the metadata() method, which takes
  a key and value. The only key defined so far is SRD_CONF_SAMPLERATE,
  which is exported into the module namespace.

API changes:
* srd_session_send() now takes an end_samplenum parameter, and had its
  options rearranged.
* srd_session_config_set() is now srd_session_metadata_set(). This keeps
  "config" options for a future feature to allow PDs or frontends to
  configure each other's options on the fly, up and down the stack.

1 files changed, 3 insertions, 0 deletions

diff --git a/module_sigrokdecode.c b/module_sigrokdecode.c
index 655c1f5..6fba05c 100644
--- a/module_sigrokdecode.c
+++ b/module_sigrokdecode.c
@@ -77,6 +77,9 @@ PyMODINIT_FUNC PyInit_sigrokdecode(void)
 	if (PyModule_AddIntConstant(mod, "OUTPUT_BINARY",
 	    SRD_OUTPUT_BINARY) == -1)
 		return NULL;
+	if (PyModule_AddIntConstant(mod, "SRD_CONF_SAMPLERATE",
+			SRD_CONF_SAMPLERATE) == -1)
+		return NULL;
 
 	mod_sigrokdecode = mod;