# Firefox-local: expose the audio one mid-stream encoder chunk spans, so a host
# that has to decide something per chunk - endpointing, or attributing an <EOU>
# to the words around it - can feed exactly that much per call. Feeding more
# decodes several chunks in one call and collapses their events into a single
# report, which loses the ordering between them. Upstreamable to
# https://github.com/mudler/parakeet.cpp
diff --git a/include/parakeet_capi.h b/include/parakeet_capi.h
--- a/include/parakeet_capi.h
+++ b/include/parakeet_capi.h
@@ -42,6 +42,9 @@
 //     Added parakeet_capi_stream_drain_events (typed per-event records with
 //     is_eob + timestamps, freed with parakeet_capi_free_events) and an
 //     "events" array in the stream_feed_json / stream_finalize_json documents.
+//
+// v6: added parakeet_capi_stream_chunk_samples, the audio one encoder chunk
+//     spans. Additive.
 int parakeet_capi_abi_version(void);
 
 // Load a GGUF model. Returns an owning context, or NULL on failure.
@@ -219,6 +222,11 @@
 // complete. Does NOT fabricate an <EOU> NeMo's streaming would not emit.
 char* parakeet_capi_stream_finalize(parakeet_stream* s);
 
+// Firefox-local: the audio one mid-stream encoder chunk spans, in 16 kHz
+// samples: feed at most this much per call to get one chunk's events per call
+// (-1 on error).
+int parakeet_capi_stream_chunk_samples(parakeet_stream* s);
+
 // One <EOU>/<EOB> event emitted by the streaming decoder. <EOU> marks the end
 // of a complete utterance (the user yielded the turn); <EOB> marks the end of a
 // backchannel (a short acknowledgment like "uh-huh" while the other party
diff --git a/src/parakeet_capi.cpp b/src/parakeet_capi.cpp
--- a/src/parakeet_capi.cpp
+++ b/src/parakeet_capi.cpp
@@ -31,7 +31,9 @@
 //     Added stream_drain_events / free_events (typed per-event records) and
 //     the "events" array in the stream_feed_json / stream_finalize_json
 //     documents.
-#define PARAKEET_CAPI_ABI_VERSION 5
+// v6: parakeet_capi_stream_chunk_samples, the audio one encoder chunk spans.
+//     Additive.
+#define PARAKEET_CAPI_ABI_VERSION 6
 
 // The opaque context: a loaded model plus a buffer for the last error message.
 struct parakeet_ctx {
@@ -621,6 +623,14 @@
     }
 }
 
+extern "C" int parakeet_capi_stream_chunk_samples(parakeet_stream* s) {
+    if (!s || !s->sess) return -1;
+    if (!s->ctx || !s->ctx->model) return -1;
+    // A mid-stream chunk is chunk_size() mel frames, each hop_length samples of
+    // audio (the first one is chunk_size_first(), which is smaller).
+    return s->sess->chunk_size() * (int)s->ctx->model->config().hop_length;
+}
+
 extern "C" int parakeet_capi_stream_drain_events(parakeet_stream* s,
                                                  parakeet_stream_event** out_events) {
     if (out_events) *out_events = nullptr;