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Code Issues Releases Wiki Activity

rtsp_client: Parse RTCP APP packets

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This commit is contained in:
Dennis Hamester 2016-11-09 15:34:05 +01:00
parent 415d2c98ac
commit c5b90f130b
1 changed files with 48 additions and 0 deletions
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48
src/rtsp_client.cpp
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@ -124,6 +124,16 @@ static url parse_url(const std::string& str) {
return result;
}
void split_string(const string& s, char delim, vector<string>& elems) {
stringstream ss;
ss.str(s);
string item;
while(getline(ss, item, delim)) {
elems.push_back(item);
}
}
static int tcp_sock_read_line(string &line) {
static string buf;
@ -375,11 +385,49 @@ error:
return false;
}
static void parse_rtcp(const char *buf, int size) {
int offset = 0;
while(size > 4) {
const rtcp_app *app = reinterpret_cast<const rtcp_app *>(buf + offset);
uint16_t len = 4 * (ntohs(app->len) + 1);
if((app->pt != 204) || (memcmp(app->name, "SES1", 4) != 0)) {
size -= len;
offset += len;
continue;
}
uint16_t string_len = ntohs(app->string_len);
string app_data(&buf[offset + sizeof(rtcp_app)], string_len);
vector<string> elems;
split_string(app_data, ';', elems);
if(elems.size() != 4) {
return;
}
vector<string> tuner;
split_string(elems[2], ',', tuner);
if(tuner.size() < 4) {
return;
}
rtsp->level = atoi(tuner[1].c_str());
rtsp->quality = atoi(tuner[3].c_str());
return;
}
}
int rtsp_read(void *buf, unsigned buf_size) {
sockaddr addr;
socklen_t addr_len = sizeof(addr);
int ret = rtsp->udp_sock.recvfrom((char *)buf, buf_size, (sockaddr *)&addr, &addr_len);
char rtcp_buf[RTCP_BUFFER_SIZE];
int rtcp_len = rtsp->rtcp_sock.recvfrom(rtcp_buf, RTCP_BUFFER_SIZE, (sockaddr *)&addr, &addr_len);
parse_rtcp(rtcp_buf, rtcp_len);
// TODO: check ip
return ret;