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http: Add support for selecting a request range

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Comment from Reimar Döffinger included as pro memoria.

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
This commit is contained in:
Anssi Hannula 2014-03-06 18:40:00 +01:00 committed by Luca Barbato
parent ddfc989063
commit 2ec33d2712
2 changed files with 20 additions and 3 deletions
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6
doc/protocols.texi
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@ -114,6 +114,12 @@ If the server supports ICY metadata, and @option{icy} was set to 1, this
contains the last non-empty metadata packet sent by the server. It should be
polled in regular intervals by applications interested in mid-stream metadata
updates.
@item offset
Set initial byte offset.
@item end_offset
Try to limit the request to bytes preceding this offset.
@end table
@section mmst

17
libavformat/http.c
View File

@ -51,7 +51,7 @@ typedef struct {
int http_code;
/* Used if "Transfer-Encoding: chunked" otherwise -1. */
int64_t chunksize;
int64_t off, filesize;
int64_t off, end_off, filesize;
char *location;
HTTPAuthState auth_state;
HTTPAuthState proxy_auth_state;
@ -106,6 +106,8 @@ static const AVOption options[] = {
{"basic", "HTTP basic authentication", 0, AV_OPT_TYPE_CONST, {.i64 = HTTP_AUTH_BASIC}, 0, 0, D|E, "auth_type" },
{"send_expect_100", "Force sending an Expect: 100-continue header for POST", OFFSET(send_expect_100), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, E },
{"location", "The actual location of the data received", OFFSET(location), AV_OPT_TYPE_STRING, { 0 }, 0, 0, D|E },
{"offset", "initial byte offset", OFFSET(off), AV_OPT_TYPE_INT64, {.i64 = 0}, 0, INT64_MAX, D },
{"end_offset", "try to limit the request to bytes preceding this offset", OFFSET(end_off), AV_OPT_TYPE_INT64, {.i64 = 0}, 0, INT64_MAX, D },
{NULL}
};
#define HTTP_CLASS(flavor)\
@ -571,9 +573,18 @@ static int http_connect(URLContext *h, const char *path, const char *local_path,
if (!has_header(s->headers, "\r\nAccept: "))
len += av_strlcpy(headers + len, "Accept: */*\r\n",
sizeof(headers) - len);
if (!has_header(s->headers, "\r\nRange: ") && !post)
// Note: we send this on purpose even when s->off is 0 when we're probing,
// since it allows us to detect more reliably if a (non-conforming)
// server supports seeking by analysing the reply headers.
if (!has_header(s->headers, "\r\nRange: ") && !post) {
len += av_strlcatf(headers + len, sizeof(headers) - len,
"Range: bytes=%"PRId64"-\r\n", s->off);
"Range: bytes=%"PRId64"-", s->off);
if (s->end_off)
len += av_strlcatf(headers + len, sizeof(headers) - len,
"%"PRId64, s->end_off - 1);
len += av_strlcpy(headers + len, "\r\n",
sizeof(headers) - len);
}
if (send_expect_100 && !has_header(s->headers, "\r\nExpect: "))
len += av_strlcatf(headers + len, sizeof(headers) - len,
"Expect: 100-continue\r\n");