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Non-blocking protocol: core wrapper functions 

Signed-off-by: Nicolas George <nicolas.george@normalesup.org>
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
(cherry picked from commit 90441276e4)
This commit is contained in:
Nicolas George 2011-02-04 19:12:37 +01:00 committed by Michael Niedermayer
parent f4bd5800ac
commit 3ce3b49824
2 changed files with 19 additions and 14 deletions
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32
libavformat/avio.c
View File

@ -206,24 +206,21 @@ int url_open(URLContext **puc, const char *filename, int flags)
return ret;
}
int url_read(URLContext *h, unsigned char *buf, int size)
{
int ret;
if (h->flags & URL_WRONLY)
return AVERROR(EIO);
ret = h->prot->url_read(h, buf, size);
return ret;
}
static inline int retry_transfer_wrapper(URLContext *h, unsigned char *buf, int size,
static inline int retry_transfer_wrapper(URLContext *h, unsigned char *buf, int size, int size_min,
int (*transfer_func)(URLContext *h, unsigned char *buf, int size))
{
int ret, len;
int fast_retries = 5;
len = 0;
while (len < size) {
while (len < size_min) {
if (url_interrupt_cb())
return AVERROR(EINTR);
ret = transfer_func(h, buf+len, size-len);
if (ret == AVERROR(EINTR))
continue;
if (h->flags & URL_FLAG_NONBLOCK)
return ret;
if (ret == AVERROR(EAGAIN)) {
ret = 0;
if (fast_retries)
@ -239,9 +236,18 @@ static inline int retry_transfer_wrapper(URLContext *h, unsigned char *buf, int
return len;
}
int url_read(URLContext *h, unsigned char *buf, int size)
{
if (h->flags & URL_WRONLY)
return AVERROR(EIO);
return retry_transfer_wrapper(h, buf, size, 1, h->prot->url_read);
}
int url_read_complete(URLContext *h, unsigned char *buf, int size)
{
return retry_transfer_wrapper(h, buf, size, url_read);
if (h->flags & URL_WRONLY)
return AVERROR(EIO);
return retry_transfer_wrapper(h, buf, size, size, h->prot->url_read);
}
int url_write(URLContext *h, const unsigned char *buf, int size)
@ -252,7 +258,7 @@ int url_write(URLContext *h, const unsigned char *buf, int size)
if (h->max_packet_size && size > h->max_packet_size)
return AVERROR(EIO);
return retry_transfer_wrapper(h, buf, size, h->prot->url_write);
return retry_transfer_wrapper(h, buf, size, size, h->prot->url_write);
}
int64_t url_seek(URLContext *h, int64_t pos, int whence)

1
libavformat/avio.h
View File

@ -151,7 +151,6 @@ int url_read(URLContext *h, unsigned char *buf, int size);
/**
* Read as many bytes as possible (up to size), calling the
* read function multiple times if necessary.
* Will also retry if the read function returns AVERROR(EAGAIN).
* This makes special short-read handling in applications
* unnecessary, if the return value is < size then it is
* certain there was either an error or the end of file was reached.