rtsp: Add a buffer_size option

And forward it to rtp and udp.
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>

libavformat/rtsp.c

@@ -72,8 +72,10 @@
     { "audio", "Audio", 0, AV_OPT_TYPE_CONST, {.i64 = 1 << AVMEDIA_TYPE_AUDIO}, 0, 0, DEC, "allowed_media_types" }, \
     { "data", "Data", 0, AV_OPT_TYPE_CONST, {.i64 = 1 << AVMEDIA_TYPE_DATA}, 0, 0, DEC, "allowed_media_types" }
 
-#define RTSP_REORDERING_OPTS() \
-    { "reorder_queue_size", "Number of packets to buffer for handling of reordered packets", OFFSET(reordering_queue_size), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, DEC }
+#define COMMON_OPTS() \
+    { "reorder_queue_size", "Number of packets to buffer for handling of reordered packets", OFFSET(reordering_queue_size), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, DEC }, \
+    { "buffer_size",        "Underlying protocol send/receive buffer size",                  OFFSET(buffer_size),           AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, DEC|ENC } \
+
 
 const AVOption ff_rtsp_options[] = {
     { "initial_pause",  "Don't start playing the stream immediately", OFFSET(initial_pause), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, DEC },
@@ -89,7 +91,7 @@ const AVOption ff_rtsp_options[] = {
     { "min_port", "Minimum local UDP port", OFFSET(rtp_port_min), AV_OPT_TYPE_INT, {.i64 = RTSP_RTP_PORT_MIN}, 0, 65535, DEC|ENC },
     { "max_port", "Maximum local UDP port", OFFSET(rtp_port_max), AV_OPT_TYPE_INT, {.i64 = RTSP_RTP_PORT_MAX}, 0, 65535, DEC|ENC },
     { "timeout", "Maximum timeout (in seconds) to wait for incoming connections. -1 is infinite. Implies flag listen", OFFSET(initial_timeout), AV_OPT_TYPE_INT, {.i64 = -1}, INT_MIN, INT_MAX, DEC },
-    RTSP_REORDERING_OPTS(),
+    COMMON_OPTS(),
     { NULL },
 };
 
@@ -98,16 +100,28 @@ static const AVOption sdp_options[] = {
     { "custom_io", "Use custom IO", 0, AV_OPT_TYPE_CONST, {.i64 = RTSP_FLAG_CUSTOM_IO}, 0, 0, DEC, "rtsp_flags" },
     { "rtcp_to_source", "Send RTCP packets to the source address of received packets", 0, AV_OPT_TYPE_CONST, {.i64 = RTSP_FLAG_RTCP_TO_SOURCE}, 0, 0, DEC, "rtsp_flags" },
     RTSP_MEDIATYPE_OPTS("allowed_media_types", "Media types to accept from the server"),
-    RTSP_REORDERING_OPTS(),
+    COMMON_OPTS(),
     { NULL },
 };
 
 static const AVOption rtp_options[] = {
     RTSP_FLAG_OPTS("rtp_flags", "RTP flags"),
-    RTSP_REORDERING_OPTS(),
+    COMMON_OPTS(),
     { NULL },
 };
 
+
+static AVDictionary *map_to_opts(RTSPState *rt)
+{
+    AVDictionary *opts = NULL;
+    char buf[256];
+
+    snprintf(buf, sizeof(buf), "%d", rt->buffer_size);
+    av_dict_set(&opts, "buffer_size", buf, 0);
+
+    return opts;
+}
+
 static void get_word_until_chars(char *buf, int buf_size,
                                  const char *sep, const char **pp)
 {
@@ -1433,12 +1447,18 @@ int ff_rtsp_make_setup_request(AVFormatContext *s, const char *host, int port,
 
             /* first try in specified port range */
             while (j <= rt->rtp_port_max) {
+                AVDictionary *opts = map_to_opts(rt);
+
                 ff_url_join(buf, sizeof(buf), "rtp", NULL, host, -1,
                             "?localport=%d", j);
                 /* we will use two ports per rtp stream (rtp and rtcp) */
                 j += 2;
-                if (!ffurl_open(&rtsp_st->rtp_handle, buf, AVIO_FLAG_READ_WRITE,
-                               &s->interrupt_callback, NULL))
+                err = ffurl_open(&rtsp_st->rtp_handle, buf, AVIO_FLAG_READ_WRITE,
+                                 &s->interrupt_callback, &opts);
+
+                av_dict_free(&opts);
+
+                if (!err)
                     goto rtp_opened;
             }
 
@@ -2236,6 +2256,8 @@ static int sdp_read_header(AVFormatContext *s)
         rtsp_st = rt->rtsp_streams[i];
 
         if (!(rt->rtsp_flags & RTSP_FLAG_CUSTOM_IO)) {
+            AVDictionary *opts = map_to_opts(rt);
+
             getnameinfo((struct sockaddr*) &rtsp_st->sdp_ip, sizeof(rtsp_st->sdp_ip),
                         namebuf, sizeof(namebuf), NULL, 0, NI_NUMERICHOST);
             ff_url_join(url, sizeof(url), "rtp", NULL,
@@ -2251,8 +2273,12 @@ static int sdp_read_header(AVFormatContext *s)
             append_source_addrs(url, sizeof(url), "block",
                                 rtsp_st->nb_exclude_source_addrs,
                                 rtsp_st->exclude_source_addrs);
-            if (ffurl_open(&rtsp_st->rtp_handle, url, AVIO_FLAG_READ_WRITE,
-                           &s->interrupt_callback, NULL) < 0) {
+            err = ffurl_open(&rtsp_st->rtp_handle, url, AVIO_FLAG_READ_WRITE,
+                           &s->interrupt_callback, &opts);
+
+            av_dict_free(&opts);
+
+            if (err < 0) {
                 err = AVERROR_INVALIDDATA;
                 goto fail;
             }

libavformat/rtsp.h

@@ -397,6 +397,7 @@ typedef struct RTSPState {
     int reordering_queue_size;
 
     char default_lang[4];
+    int buffer_size;
 } RTSPState;
 
 #define RTSP_FLAG_FILTER_SRC  0x1    /**< Filter incoming UDP packets -

libavformat/rtspdec.c

@@ -287,10 +287,15 @@ static int rtsp_read_setup(AVFormatContext *s, char* host, char *controlurl)
                  request.transports[0].interleaved_max);
     } else {
         do {
+            AVDictionary *opts = NULL;
+            char buf[256];
+            snprintf(buf, sizeof(buf), "%d", rt->buffer_size);
+            av_dict_set(&opts, "buffer_size", buf, 0);
             ff_url_join(url, sizeof(url), "rtp", NULL, host, localport, NULL);
             av_dlog(s, "Opening: %s", url);
             ret = ffurl_open(&rtsp_st->rtp_handle, url, AVIO_FLAG_READ_WRITE,
-                             &s->interrupt_callback, NULL);
+                             &s->interrupt_callback, &opts);
+            av_dict_free(&opts);
             if (ret)
                 localport += 2;
         } while (ret || localport > rt->rtp_port_max);