http: Change the chunksize AVOption into chunked_post

The chunksize internal variable has two different uses - for
reading, it's the amount of data left of the current chunk
(or -1 if the server doesn't send data in chunked mode), where
it's only an internal state variable. For writing, it's used
to decide whether to enable chunked encoding (by default), by
using the value 0, or disable chunked encoding (value -1).

This, while consistent, doesn't make much sense to expose
as an AVOption. This splits the usage of the internal variable
into two variables, chunksize which is used for reading (as
before), and chunked_post which is the user-settable option,
with the values 0 and 1, where 1 is default.
Signed-off-by: Martin Storsjö <martin@martin.st>

libavformat/http.c

@@ -49,13 +49,14 @@ typedef struct {
     HTTPAuthState auth_state;
     char *headers;
     int willclose;          /**< Set if the server correctly handles Connection: close and will close the connection after feeding us the content. */
+    int chunked_post;
 } HTTPContext;
 
 #define OFFSET(x) offsetof(HTTPContext, x)
 #define D AV_OPT_FLAG_DECODING_PARAM
 #define E AV_OPT_FLAG_ENCODING_PARAM
 static const AVOption options[] = {
-{"chunksize", "use chunked transfer-encoding for posts, -1 disables it, 0 enables it", OFFSET(chunksize), AV_OPT_TYPE_INT64, {.dbl = 0}, -1, 0, E }, /* Default to 0, for chunked POSTs */
+{"chunked_post", "use chunked transfer-encoding for posts", OFFSET(chunked_post), AV_OPT_TYPE_INT, {.dbl = 1}, 0, 1, E },
 {"headers", "custom HTTP headers, can override built in default headers", OFFSET(headers), AV_OPT_TYPE_STRING, { 0 }, 0, 0, D|E },
 {NULL}
 };
@@ -338,7 +339,7 @@ static int http_connect(URLContext *h, const char *path, const char *hoststr,
              "\r\n",
              post ? "POST" : "GET",
              path,
-             post && s->chunksize >= 0 ? "Transfer-Encoding: chunked\r\n" : "",
+             post && s->chunked_post ? "Transfer-Encoding: chunked\r\n" : "",
              headers,
              authstr ? authstr : "");
 
@@ -435,7 +436,7 @@ static int http_write(URLContext *h, const uint8_t *buf, int size)
     char crlf[] = "\r\n";
     HTTPContext *s = h->priv_data;
 
-    if (s->chunksize == -1) {
+    if (!s->chunked_post) {
         /* non-chunked data is sent without any special encoding */
         return ffurl_write(s->hd, buf, size);
     }
@@ -461,7 +462,7 @@ static int http_close(URLContext *h)
     HTTPContext *s = h->priv_data;
 
     /* signal end of chunked encoding if used */
-    if ((h->flags & AVIO_FLAG_WRITE) && s->chunksize != -1) {
+    if ((h->flags & AVIO_FLAG_WRITE) && s->chunked_post) {
         ret = ffurl_write(s->hd, footer, sizeof(footer) - 1);
         ret = ret > 0 ? 0 : ret;
     }

libavformat/rtsp.c

@@ -1486,7 +1486,7 @@ redirect:
                  "Expires: Sun, 9 Jan 1972 00:00:00 GMT\r\n",
                  sessioncookie);
         av_opt_set(rt->rtsp_hd_out->priv_data, "headers", headers, 0);
-        av_opt_set(rt->rtsp_hd_out->priv_data, "chunksize", "-1", 0);
+        av_opt_set(rt->rtsp_hd_out->priv_data, "chunked_post", "0", 0);
 
         /* Initialize the authentication state for the POST session. The HTTP
          * protocol implementation doesn't properly handle multi-pass