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avformat/file: add fd protocol

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Unlike the pipe protocol, fd protocol has seek support if it
corresponding to a regular file.

Signed-off-by: Zhao Zhili <zhilizhao@tencent.com>
This commit is contained in:
Zhao Zhili
2022-12-15 01:10:10 +08:00
parent e9fe1634d4
commit 6e7c006e40
5 changed files with 101 additions and 19 deletions
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87
libavformat/file.c
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@@ -110,6 +110,13 @@ static const AVClass pipe_class = {
.version = LIBAVUTIL_VERSION_INT,
};
static const AVClass fd_class = {
.class_name = "fd",
.item_name = av_default_item_name,
.option = pipe_options,
.version = LIBAVUTIL_VERSION_INT,
};
static int file_read(URLContext *h, unsigned char *buf, int size)
{
FileContext *c = h->priv_data;
@@ -197,6 +204,23 @@ static int file_close(URLContext *h)
return (ret == -1) ? AVERROR(errno) : 0;
}
/* XXX: use llseek */
static int64_t file_seek(URLContext *h, int64_t pos, int whence)
{
FileContext *c = h->priv_data;
int64_t ret;
if (whence == AVSEEK_SIZE) {
struct stat st;
ret = fstat(c->fd, &st);
return ret < 0 ? AVERROR(errno) : (S_ISFIFO(st.st_mode) ? 0 : st.st_size);
}
ret = lseek(c->fd, pos, whence);
return ret < 0 ? AVERROR(errno) : ret;
}
#if CONFIG_FILE_PROTOCOL
static int file_delete(URLContext *h)
@@ -276,23 +300,6 @@ static int file_open(URLContext *h, const char *filename, int flags)
return 0;
}
/* XXX: use llseek */
static int64_t file_seek(URLContext *h, int64_t pos, int whence)
{
FileContext *c = h->priv_data;
int64_t ret;
if (whence == AVSEEK_SIZE) {
struct stat st;
ret = fstat(c->fd, &st);
return ret < 0 ? AVERROR(errno) : (S_ISFIFO(st.st_mode) ? 0 : st.st_size);
}
ret = lseek(c->fd, pos, whence);
return ret < 0 ? AVERROR(errno) : ret;
}
static int file_open_dir(URLContext *h)
{
#if HAVE_LSTAT
@@ -441,3 +448,49 @@ const URLProtocol ff_pipe_protocol = {
};
#endif /* CONFIG_PIPE_PROTOCOL */
#if CONFIG_FD_PROTOCOL
static int fd_open(URLContext *h, const char *filename, int flags)
{
FileContext *c = h->priv_data;
struct stat st;
if (strcmp(filename, "fd:") != 0) {
av_log(h, AV_LOG_ERROR, "Doesn't support pass file descriptor via URL,"
" please set it via -fd {num}\n");
return AVERROR(EINVAL);
}
if (c->fd < 0) {
if (flags & AVIO_FLAG_WRITE) {
c->fd = 1;
} else {
c->fd = 0;
}
}
if (fstat(c->fd, &st) < 0)
return AVERROR(errno);
h->is_streamed = !(S_ISREG(st.st_mode) || S_ISBLK(st.st_mode));
c->fd = fd_dup(h, c->fd);
if (c->fd == -1)
return AVERROR(errno);
return 0;
}
const URLProtocol ff_fd_protocol = {
.name = "fd",
.url_open = fd_open,
.url_read = file_read,
.url_write = file_write,
.url_seek = file_seek,
.url_close = file_close,
.url_get_file_handle = file_get_handle,
.url_check = file_check,
.priv_data_size = sizeof(FileContext),
.priv_data_class = &fd_class,
.default_whitelist = "crypto,data"
};
#endif /* CONFIG_FD_PROTOCOL */