* add new API function pa_stream_get_buffer_attr().

* modify pacat.c to make use of that new API
* extend protocol to allow transfer of the necessary information
* update protocol version accordingly


git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@976 fefdeb5f-60dc-0310-8127-8f9354f1896f

3 files changed, 51 insertions, 2 deletions

diff --git a/src/polyp/internal.h b/src/polyp/internal.h
index 80c28616..d88a1e5b 100644
--- a/src/polyp/internal.h
+++ b/src/polyp/internal.h
@@ -100,6 +100,7 @@ struct pa_stream {
 
     char *name;
     pa_buffer_attr buffer_attr;
+    int buffer_attr_from_server;
     pa_sample_spec sample_spec;
     pa_channel_map channel_map;
     pa_stream_flags_t flags;
diff --git a/src/polyp/stream.c b/src/polyp/stream.c
index e41c588e..17884ed3 100644
--- a/src/polyp/stream.c
+++ b/src/polyp/stream.c
@@ -84,6 +84,7 @@ pa_stream *pa_stream_new(pa_context *c, const char *name, const pa_sample_spec *
     s->requested_bytes = 0;
     s->state = PA_STREAM_UNCONNECTED;
     memset(&s->buffer_attr, 0, sizeof(s->buffer_attr));
+    s->buffer_attr_from_server = 0;
 
     s->peek_memchunk.index = 0;
     s->peek_memchunk.length = 0;
@@ -401,12 +402,43 @@ void pa_create_stream_callback(pa_pdispatch *pd, uint32_t command, PA_GCC_UNUSED
 
     if (pa_tagstruct_getu32(t, &s->channel) < 0 ||
         ((s->direction != PA_STREAM_UPLOAD) && pa_tagstruct_getu32(t, &s->device_index) < 0) ||
-        ((s->direction != PA_STREAM_RECORD) && pa_tagstruct_getu32(t, &s->requested_bytes) < 0) ||
-        !pa_tagstruct_eof(t)) {
+        ((s->direction != PA_STREAM_RECORD) && pa_tagstruct_getu32(t, &s->requested_bytes) < 0)) {
         pa_context_fail(s->context, PA_ERR_PROTOCOL);
         goto finish;
     }
 
+    if (!pa_tagstruct_eof(t)) {
+        
+        if (s->direction == PA_STREAM_PLAYBACK) {
+
+            /* This is a server 0.9.0 or later */
+            if (pa_tagstruct_getu32(t, &s->buffer_attr.maxlength) < 0 ||
+                pa_tagstruct_getu32(t, &s->buffer_attr.tlength) < 0 ||
+                pa_tagstruct_getu32(t, &s->buffer_attr.prebuf) < 0 ||
+                pa_tagstruct_getu32(t, &s->buffer_attr.minreq) < 0 ||
+                !pa_tagstruct_eof(t)) {
+                pa_context_fail(s->context, PA_ERR_PROTOCOL);
+                goto finish;
+            }
+
+            s->buffer_attr_from_server = 1;
+        } else if (s->direction == PA_STREAM_RECORD) {
+            
+            /* This is a server 0.9.0 or later */
+            if (pa_tagstruct_getu32(t, &s->buffer_attr.maxlength) < 0 ||
+                pa_tagstruct_getu32(t, &s->buffer_attr.fragsize) < 0 ||
+                !pa_tagstruct_eof(t)) {
+                pa_context_fail(s->context, PA_ERR_PROTOCOL);
+                goto finish;
+            }
+
+            s->buffer_attr_from_server = 1;
+        } else {
+            pa_context_fail(s->context, PA_ERR_PROTOCOL);
+            goto finish;
+        }
+    }
+
     if (s->direction == PA_STREAM_RECORD) {
         assert(!s->record_memblockq);
         
@@ -1336,3 +1368,14 @@ const pa_channel_map* pa_stream_get_channel_map(pa_stream *s) {
 
     return &s->channel_map;
 }
+
+const pa_buffer_attr* pa_stream_get_buffer_attr(pa_stream *s) {
+    assert(s);
+    assert(s->ref >= 1);
+
+    PA_CHECK_VALIDITY_RETURN_NULL(s->context, s->state == PA_STREAM_READY, PA_ERR_BADSTATE);
+    PA_CHECK_VALIDITY_RETURN_NULL(s->context, s->direction != PA_STREAM_UPLOAD, PA_ERR_BADSTATE);
+    PA_CHECK_VALIDITY_RETURN_NULL(s->context, s->buffer_attr_from_server, PA_ERR_NODATA);
+
+    return &s->buffer_attr;
+}
diff --git a/src/polyp/stream.h b/src/polyp/stream.h
index ad77d938..d1f558ae 100644
--- a/src/polyp/stream.h
+++ b/src/polyp/stream.h
@@ -439,6 +439,11 @@ const pa_sample_spec* pa_stream_get_sample_spec(pa_stream *s);
 /** Return a pointer to the stream's channel map. \since 0.8 */
 const pa_channel_map* pa_stream_get_channel_map(pa_stream *s);
 
+/** Return the buffer metrics of the stream. Only valid after the
+ * stream has been connected successfuly and if the server is at least
+ * Polypaudio 0.9. \since 0.9.0 */
+const pa_buffer_attr* pa_stream_get_buffer_attr(pa_stream *s);
+
 PA_C_DECL_END
 
 #endif