mirror of https://github.com/mpv-player/mpv
373 lines
10 KiB
C
373 lines
10 KiB
C
/*
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* Original authors: Albeu, probably Arpi
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*
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* This file is part of mpv.
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*
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* mpv is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* mpv is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with mpv. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <errno.h>
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#ifndef __MINGW32__
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#include <poll.h>
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#endif
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#include "osdep/io.h"
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#include "common/common.h"
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#include "common/msg.h"
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#include "stream.h"
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#include "options/m_option.h"
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#include "options/path.h"
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#if HAVE_BSD_FSTATFS
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#include <sys/param.h>
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#include <sys/mount.h>
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#endif
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#if HAVE_LINUX_FSTATFS
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#include <sys/vfs.h>
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#endif
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#ifdef _WIN32
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#include <windows.h>
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#include <winternl.h>
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#include <io.h>
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#ifndef FILE_REMOTE_DEVICE
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#define FILE_REMOTE_DEVICE (0x10)
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#endif
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#endif
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struct priv {
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int fd;
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bool close;
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bool use_poll;
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bool regular_file;
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bool appending;
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int64_t orig_size;
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};
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// Total timeout = RETRY_TIMEOUT * MAX_RETRIES
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#define RETRY_TIMEOUT 0.2
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#define MAX_RETRIES 10
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static int64_t get_size(stream_t *s)
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{
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struct priv *p = s->priv;
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off_t size = lseek(p->fd, 0, SEEK_END);
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lseek(p->fd, s->pos, SEEK_SET);
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return size == (off_t)-1 ? -1 : size;
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}
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static int fill_buffer(stream_t *s, char *buffer, int max_len)
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{
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struct priv *p = s->priv;
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#ifndef __MINGW32__
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if (p->use_poll) {
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int c = s->cancel ? mp_cancel_get_fd(s->cancel) : -1;
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struct pollfd fds[2] = {
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{.fd = p->fd, .events = POLLIN},
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{.fd = c, .events = POLLIN},
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};
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poll(fds, c >= 0 ? 2 : 1, -1);
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if (fds[1].revents & POLLIN)
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return -1;
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}
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#endif
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for (int retries = 0; retries < MAX_RETRIES; retries++) {
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int r = read(p->fd, buffer, max_len);
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if (r > 0)
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return r;
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// Try to detect and handle files being appended during playback.
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int64_t size = get_size(s);
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if (p->regular_file && size > p->orig_size && !p->appending) {
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MP_WARN(s, "File is apparently being appended to, will keep "
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"retrying with timeouts.\n");
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p->appending = true;
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}
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if (!p->appending || p->use_poll)
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break;
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if (mp_cancel_wait(s->cancel, RETRY_TIMEOUT))
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break;
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}
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return 0;
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}
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static int write_buffer(stream_t *s, char *buffer, int len)
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{
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struct priv *p = s->priv;
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int r;
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int wr = 0;
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while (wr < len) {
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r = write(p->fd, buffer, len);
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if (r <= 0)
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return -1;
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wr += r;
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buffer += r;
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}
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return len;
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}
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static int seek(stream_t *s, int64_t newpos)
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{
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struct priv *p = s->priv;
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return lseek(p->fd, newpos, SEEK_SET) != (off_t)-1;
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}
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static int control(stream_t *s, int cmd, void *arg)
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{
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switch (cmd) {
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case STREAM_CTRL_GET_SIZE: {
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int64_t size = get_size(s);
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if (size >= 0) {
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*(int64_t *)arg = size;
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return 1;
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}
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break;
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}
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}
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return STREAM_UNSUPPORTED;
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}
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static void s_close(stream_t *s)
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{
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struct priv *p = s->priv;
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if (p->close)
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close(p->fd);
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}
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// If url is a file:// URL, return the local filename, otherwise return NULL.
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char *mp_file_url_to_filename(void *talloc_ctx, bstr url)
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{
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bstr proto = mp_split_proto(url, &url);
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if (bstrcasecmp0(proto, "file") != 0)
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return NULL;
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char *filename = bstrto0(talloc_ctx, url);
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mp_url_unescape_inplace(filename);
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#if HAVE_DOS_PATHS
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// extract '/' from '/x:/path'
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if (filename[0] == '/' && filename[1] && filename[2] == ':')
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memmove(filename, filename + 1, strlen(filename)); // including \0
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#endif
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return filename;
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}
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// Return talloc_strdup's filesystem path if local, otherwise NULL.
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// Unlike mp_file_url_to_filename(), doesn't return NULL if already local.
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char *mp_file_get_path(void *talloc_ctx, bstr url)
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{
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if (mp_split_proto(url, &(bstr){0}).len) {
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return mp_file_url_to_filename(talloc_ctx, url);
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} else {
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return bstrto0(talloc_ctx, url);
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}
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}
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#if HAVE_BSD_FSTATFS
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static bool check_stream_network(int fd)
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{
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struct statfs fs;
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const char *stypes[] = { "afpfs", "nfs", "smbfs", "webdav", NULL };
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if (fstatfs(fd, &fs) == 0)
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for (int i=0; stypes[i]; i++)
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if (strcmp(stypes[i], fs.f_fstypename) == 0)
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return true;
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return false;
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}
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#elif HAVE_LINUX_FSTATFS
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static bool check_stream_network(int fd)
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{
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struct statfs fs;
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const uint32_t stypes[] = {
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0x5346414F /*AFS*/, 0x61756673 /*AUFS*/, 0x00C36400 /*CEPH*/,
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0xFF534D42 /*CIFS*/, 0x73757245 /*CODA*/, 0x19830326 /*FHGFS*/,
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0x65735546 /*FUSEBLK*/,0x65735543 /*FUSECTL*/,0x1161970 /*GFS*/,
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0x47504653 /*GPFS*/, 0x6B414653 /*KAFS*/, 0x0BD00BD0 /*LUSTRE*/,
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0x564C /*NCP*/, 0x6969 /*NFS*/, 0x6E667364 /*NFSD*/,
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0xAAD7AAEA /*PANFS*/, 0x50495045 /*PIPEFS*/, 0x517B /*SMB*/,
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0xBEEFDEAD /*SNFS*/, 0xBACBACBC /*VMHGFS*/, 0x7461636f /*OCFS2*/,
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0
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};
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if (fstatfs(fd, &fs) == 0) {
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for (int i=0; stypes[i]; i++) {
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if (stypes[i] == fs.f_type)
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return true;
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}
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}
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return false;
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}
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#elif defined(_WIN32)
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static bool check_stream_network(int fd)
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{
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NTSTATUS (NTAPI *pNtQueryVolumeInformationFile)(HANDLE,
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PIO_STATUS_BLOCK, PVOID, ULONG, FS_INFORMATION_CLASS) = NULL;
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// NtQueryVolumeInformationFile is an internal Windows function. It has
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// been present since Windows XP, however this code should fail gracefully
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// if it's removed from a future version of Windows.
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HMODULE ntdll = GetModuleHandleW(L"ntdll.dll");
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pNtQueryVolumeInformationFile = (NTSTATUS (NTAPI*)(HANDLE,
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PIO_STATUS_BLOCK, PVOID, ULONG, FS_INFORMATION_CLASS))
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GetProcAddress(ntdll, "NtQueryVolumeInformationFile");
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if (!pNtQueryVolumeInformationFile)
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return false;
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HANDLE h = (HANDLE)_get_osfhandle(fd);
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if (h == INVALID_HANDLE_VALUE)
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return false;
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FILE_FS_DEVICE_INFORMATION info = { 0 };
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IO_STATUS_BLOCK io;
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NTSTATUS status = pNtQueryVolumeInformationFile(h, &io, &info,
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sizeof(info), FileFsDeviceInformation);
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if (!NT_SUCCESS(status))
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return false;
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return info.DeviceType == FILE_DEVICE_NETWORK_FILE_SYSTEM ||
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(info.Characteristics & FILE_REMOTE_DEVICE);
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}
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#else
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static bool check_stream_network(int fd)
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{
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return false;
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}
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#endif
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static int open_f(stream_t *stream)
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{
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struct priv *p = talloc_ptrtype(stream, p);
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*p = (struct priv) {
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.fd = -1
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};
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stream->priv = p;
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stream->is_local_file = true;
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bool write = stream->mode == STREAM_WRITE;
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int m = O_CLOEXEC | (write ? O_RDWR | O_CREAT | O_TRUNC : O_RDONLY);
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char *filename = mp_file_url_to_filename(stream, bstr0(stream->url));
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if (filename) {
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stream->path = filename;
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} else {
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filename = stream->path;
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}
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bool is_fdclose = strncmp(stream->url, "fdclose://", 10) == 0;
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if (strncmp(stream->url, "fd://", 5) == 0 || is_fdclose) {
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char *begin = strstr(stream->url, "://") + 3, *end = NULL;
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p->fd = strtol(begin, &end, 0);
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if (!end || end == begin || end[0]) {
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MP_ERR(stream, "Invalid FD: %s\n", stream->url);
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return STREAM_ERROR;
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}
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if (is_fdclose)
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p->close = true;
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} else if (!strcmp(filename, "-")) {
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if (!write) {
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MP_INFO(stream, "Reading from stdin...\n");
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p->fd = 0;
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} else {
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MP_INFO(stream, "Writing to stdout...\n");
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p->fd = 1;
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}
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} else {
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if (bstr_startswith0(bstr0(stream->url), "appending://"))
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p->appending = true;
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mode_t openmode = S_IRUSR | S_IWUSR;
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#ifndef __MINGW32__
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openmode |= S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH;
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if (!write)
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m |= O_NONBLOCK;
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p->use_poll = true;
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#endif
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p->fd = open(filename, m | O_BINARY, openmode);
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if (p->fd < 0) {
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MP_ERR(stream, "Cannot open file '%s': %s\n",
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filename, mp_strerror(errno));
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return STREAM_ERROR;
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}
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struct stat st;
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if (fstat(p->fd, &st) == 0) {
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if (S_ISDIR(st.st_mode)) {
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p->use_poll = false;
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stream->is_directory = true;
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stream->allow_caching = false;
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MP_INFO(stream, "This is a directory - adding to playlist.\n");
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}
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#ifndef __MINGW32__
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if (S_ISREG(st.st_mode)) {
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p->use_poll = false;
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p->regular_file = true;
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// O_NONBLOCK has weird semantics on file locks; remove it.
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int val = fcntl(p->fd, F_GETFL) & ~(unsigned)O_NONBLOCK;
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fcntl(p->fd, F_SETFL, val);
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}
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#endif
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}
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p->close = true;
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}
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#ifdef __MINGW32__
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setmode(p->fd, O_BINARY);
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#endif
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off_t len = lseek(p->fd, 0, SEEK_END);
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lseek(p->fd, 0, SEEK_SET);
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if (len != (off_t)-1) {
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stream->seek = seek;
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stream->seekable = true;
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}
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stream->fast_skip = true;
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stream->fill_buffer = fill_buffer;
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stream->write_buffer = write_buffer;
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stream->control = control;
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stream->read_chunk = 64 * 1024;
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stream->close = s_close;
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if (check_stream_network(p->fd))
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stream->streaming = true;
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p->orig_size = get_size(stream);
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return STREAM_OK;
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}
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const stream_info_t stream_info_file = {
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.name = "file",
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.open = open_f,
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.protocols = (const char*const[]){ "file", "", "fd", "fdclose",
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"appending", NULL },
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.can_write = true,
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.is_safe = true,
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};
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