* add RTP/SAP/SDP reciever module

* use server cookie as RTP SSRC
* enable SVN keywords
* add new option "loop" for RTP sender module


git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@716 fefdeb5f-60dc-0310-8127-8f9354f1896f

1 files changed, 186 insertions, 12 deletions

diff --git a/src/modules/rtp/sdp.c b/src/modules/rtp/sdp.c
index 99e8c12b..9dca15ba 100644
--- a/src/modules/rtp/sdp.c
+++ b/src/modules/rtp/sdp.c
@@ -29,21 +29,15 @@
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <arpa/inet.h>
+#include <string.h>
 
 #include <polypcore/util.h>
+#include <polypcore/log.h>
+#include <polypcore/xmalloc.h>
 
 #include "sdp.h"
+#include "rtp.h"
 
-static const char* map_format(pa_sample_format_t f) {
-    switch (f) {
-        case PA_SAMPLE_S16BE: return "L16";
-        case PA_SAMPLE_U8: return "L8";
-        case PA_SAMPLE_ALAW: return "PCMA";
-        case PA_SAMPLE_ULAW: return "PCMU";
-        default:
-            return NULL;
-    }
-}
 
 char *pa_sdp_build(int af, const void *src, const void *dst, const char *name, uint16_t port, uint8_t payload, const pa_sample_spec *ss) {
     uint32_t ntp;
@@ -54,7 +48,7 @@ char *pa_sdp_build(int af, const void *src, const void *dst, const char *name, u
     assert(dst);
     assert(af == AF_INET || af == AF_INET6);
 
-    f = map_format(ss->format);
+    f = pa_rtp_format_to_string(ss->format);
     assert(f);
     
     if (!(u = getenv("USER")))
@@ -69,7 +63,7 @@ char *pa_sdp_build(int af, const void *src, const void *dst, const char *name, u
     assert(a);
     
     return pa_sprintf_malloc(
-            "v=0\n"
+            PA_SDP_HEADER
             "o=%s %lu 0 IN %s %s\n"
             "s=%s\n"
             "c=IN %s %s\n"
@@ -85,3 +79,183 @@ char *pa_sdp_build(int af, const void *src, const void *dst, const char *name, u
             port, payload,
             payload, f, ss->rate, ss->channels);
 }
+
+static pa_sample_spec *parse_sdp_sample_spec(pa_sample_spec *ss, char *c) {
+    unsigned rate, channels;
+    assert(ss);
+    assert(c);
+
+    if (pa_startswith(c, "L16/")) {
+        ss->format = PA_SAMPLE_S16BE;
+        c += 4;
+    } else if (pa_startswith(c, "L8/")) {
+        ss->format = PA_SAMPLE_U8;
+        c += 3;
+    } else if (pa_startswith(c, "PCMA/")) {
+        ss->format = PA_SAMPLE_ALAW;
+        c += 5;
+    } else if (pa_startswith(c, "PCMU/")) {
+        ss->format = PA_SAMPLE_ULAW;
+        c += 5;
+    } else
+        return NULL;
+
+    if (sscanf(c, "%u/%u", &rate, &channels) == 2) {
+        ss->rate = rate;
+        ss->channels = channels;
+    } else if (sscanf(c, "%u", &rate) == 2) {
+        ss->rate = rate;
+        ss->channels = 1;
+    } else
+        return NULL;
+
+    if (!pa_sample_spec_valid(ss))
+        return NULL;
+
+    return ss;
+}
+
+pa_sdp_info *pa_sdp_parse(const char *t, pa_sdp_info *i, int is_goodbye) {
+    uint16_t port = 0;
+    int ss_valid = 0;
+
+    assert(t);
+    assert(i);
+    
+    i->origin = i->session_name = NULL;
+    i->salen = 0;
+    i->payload = 255;
+    
+    if (!pa_startswith(t, PA_SDP_HEADER)) {
+        pa_log(__FILE__": Failed to parse SDP data: invalid header.");
+        goto fail;
+    }
+
+    t += sizeof(PA_SDP_HEADER)-1;
+
+    while (*t) {
+        size_t l;
+
+        l = strcspn(t, "\n");
+
+        if (l <= 2) {
+            pa_log(__FILE__": Failed to parse SDP data: line too short: >%s<.", t);
+            goto fail;
+        }
+
+        if (pa_startswith(t, "o="))
+            i->origin = pa_xstrndup(t+2, l-2);
+        else if (pa_startswith(t, "s="))
+            i->session_name = pa_xstrndup(t+2, l-2);
+        else if (pa_startswith(t, "c=IN IP4 ")) {
+            char a[64];
+            size_t k;
+
+            k = l-8 > sizeof(a) ? sizeof(a) : l-8;
+            
+            pa_strlcpy(a, t+9, k);
+            a[strcspn(a, "/")] = 0;
+
+            if (inet_pton(AF_INET, a, &((struct sockaddr_in*) &i->sa)->sin_addr) <= 0) {
+                pa_log(__FILE__": Failed to parse SDP data: bad address: >%s<.", a);
+                goto fail;
+            }
+
+            ((struct sockaddr_in*) &i->sa)->sin_family = AF_INET;
+            ((struct sockaddr_in*) &i->sa)->sin_port = 0;
+            i->salen = sizeof(struct sockaddr_in);
+        } else if (pa_startswith(t, "c=IN IP6 ")) {
+            char a[64];
+            size_t k;
+
+            k = l-8 > sizeof(a) ? sizeof(a) : l-8;
+            
+            pa_strlcpy(a, t+9, k);
+            a[strcspn(a, "/")] = 0;
+
+            if (inet_pton(AF_INET6, a, &((struct sockaddr_in6*) &i->sa)->sin6_addr) <= 0) {
+                pa_log(__FILE__": Failed to parse SDP data: bad address: >%s<.", a);
+                goto fail;
+            }
+
+            ((struct sockaddr_in6*) &i->sa)->sin6_family = AF_INET6;
+            ((struct sockaddr_in6*) &i->sa)->sin6_port = 0;
+            i->salen = sizeof(struct sockaddr_in6);
+        } else if (pa_startswith(t, "m=audio ")) {
+
+            if (i->payload > 127) {
+                int _port, _payload;
+                
+                if (sscanf(t+8, "%i RTP/AVP %i", &_port, &_payload) == 2) {
+
+                    if (_port <= 0 || _port > 0xFFFF) {
+                        pa_log(__FILE__": Failed to parse SDP data: invalid port %i.", _port);
+                        goto fail;
+                    }
+
+                    if (_payload < 0 || _payload > 127) {
+                        pa_log(__FILE__": Failed to parse SDP data: invalid payload %i.", _payload);
+                        goto fail;
+                    }
+
+                    port = (uint16_t) _port;
+                    i->payload = (uint8_t) _payload;
+
+                    if (pa_rtp_sample_spec_from_payload(i->payload, &i->sample_spec))
+                        ss_valid = 1;
+                }
+            }
+        } else if (pa_startswith(t, "a=rtpmap:")) {
+
+            if (i->payload <= 127) {
+                char c[64];
+                int _payload;
+
+                if (sscanf(t+9, "%i %64c", &_payload, c) == 2) {
+
+                    if (_payload < 0 || _payload > 127) {
+                        pa_log(__FILE__": Failed to parse SDP data: invalid payload %i.", _payload);
+                        goto fail;
+                    }
+                    if (_payload == i->payload) {
+
+                        c[strcspn(c, "\n")] = 0;
+                        
+                        if (parse_sdp_sample_spec(&i->sample_spec, c))
+                            ss_valid = 1;
+                    }
+                }
+            }
+        }
+        
+        t += l;
+        
+        if (*t == '\n')
+            t++;
+    }
+
+    if (!i->origin || (!is_goodbye && (!i->salen || i->payload > 127 || !ss_valid || port == 0))) {
+        pa_log(__FILE__": Failed to parse SDP data: missing data.");
+        goto fail;
+    }
+
+    if (((struct sockaddr*) &i->sa)->sa_family == AF_INET)
+        ((struct sockaddr_in*) &i->sa)->sin_port = htons(port);
+    else
+        ((struct sockaddr_in6*) &i->sa)->sin6_port = htons(port);
+    
+    return i;
+
+fail:
+    pa_xfree(i->origin);
+    pa_xfree(i->session_name);
+
+    return NULL;
+}
+
+void pa_sdp_info_destroy(pa_sdp_info *i) {
+    assert(i);
+
+    pa_xfree(i->origin);
+    pa_xfree(i->session_name);
+}