mirror of
https://github.com/mpv-player/mpv
synced 2024-12-22 23:02:37 +00:00
91cc0d8cf6
c784820454
introduced a bool option type
as a replacement for the flag type, but didn't actually transition and
remove the flag type because it would have been too much mundane work.
900 lines
26 KiB
C
900 lines
26 KiB
C
/*
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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 <stdio.h>
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#include <stdlib.h>
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#include <limits.h>
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#include <strings.h>
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#include <assert.h>
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#include "osdep/io.h"
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#include "mpv_talloc.h"
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#include "config.h"
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#include "common/common.h"
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#include "common/global.h"
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#include "misc/bstr.h"
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#include "misc/thread_tools.h"
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#include "common/msg.h"
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#include "options/m_config.h"
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#include "options/options.h"
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#include "options/path.h"
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#include "osdep/timer.h"
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#include "stream.h"
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#include "options/m_option.h"
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#include "options/m_config.h"
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extern const stream_info_t stream_info_cdda;
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extern const stream_info_t stream_info_dvb;
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extern const stream_info_t stream_info_null;
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extern const stream_info_t stream_info_memory;
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extern const stream_info_t stream_info_mf;
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extern const stream_info_t stream_info_ffmpeg;
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extern const stream_info_t stream_info_ffmpeg_unsafe;
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extern const stream_info_t stream_info_avdevice;
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extern const stream_info_t stream_info_file;
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extern const stream_info_t stream_info_slice;
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extern const stream_info_t stream_info_fd;
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extern const stream_info_t stream_info_ifo_dvdnav;
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extern const stream_info_t stream_info_dvdnav;
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extern const stream_info_t stream_info_bdmv_dir;
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extern const stream_info_t stream_info_bluray;
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extern const stream_info_t stream_info_bdnav;
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extern const stream_info_t stream_info_edl;
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extern const stream_info_t stream_info_libarchive;
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extern const stream_info_t stream_info_cb;
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static const stream_info_t *const stream_list[] = {
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#if HAVE_CDDA
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&stream_info_cdda,
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#endif
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&stream_info_ffmpeg,
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&stream_info_ffmpeg_unsafe,
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&stream_info_avdevice,
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#if HAVE_DVBIN
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&stream_info_dvb,
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#endif
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#if HAVE_DVDNAV
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&stream_info_ifo_dvdnav,
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&stream_info_dvdnav,
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#endif
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#if HAVE_LIBBLURAY
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&stream_info_bdmv_dir,
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&stream_info_bluray,
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&stream_info_bdnav,
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#endif
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#if HAVE_LIBARCHIVE
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&stream_info_libarchive,
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#endif
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&stream_info_memory,
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&stream_info_null,
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&stream_info_mf,
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&stream_info_edl,
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&stream_info_file,
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&stream_info_slice,
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&stream_info_fd,
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&stream_info_cb,
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};
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// Because of guarantees documented on STREAM_BUFFER_SIZE.
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// Half the buffer is used as forward buffer, the other for seek-back.
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#define STREAM_MIN_BUFFER_SIZE (STREAM_BUFFER_SIZE * 2)
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// Sort of arbitrary; keep *2 of it comfortably within integer limits.
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// Must be power of 2.
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#define STREAM_MAX_BUFFER_SIZE (512 * 1024 * 1024)
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struct stream_opts {
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int64_t buffer_size;
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bool load_unsafe_playlists;
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};
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#define OPT_BASE_STRUCT struct stream_opts
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const struct m_sub_options stream_conf = {
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.opts = (const struct m_option[]){
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{"stream-buffer-size", OPT_BYTE_SIZE(buffer_size),
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M_RANGE(STREAM_MIN_BUFFER_SIZE, STREAM_MAX_BUFFER_SIZE)},
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{"load-unsafe-playlists", OPT_BOOL(load_unsafe_playlists)},
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{0}
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},
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.size = sizeof(struct stream_opts),
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.defaults = &(const struct stream_opts){
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.buffer_size = 128 * 1024,
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},
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};
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// return -1 if not hex char
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static int hex2dec(char c)
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{
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if (c >= '0' && c <= '9')
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return c - '0';
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if (c >= 'A' && c <= 'F')
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return 10 + c - 'A';
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if (c >= 'a' && c <= 'f')
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return 10 + c - 'a';
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return -1;
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}
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// Replace escape sequences in an URL (or a part of an URL)
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void mp_url_unescape_inplace(char *url)
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{
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for (int len = strlen(url), i = 0, o = 0; i <= len;) {
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if ((url[i] != '%') || (i > len - 3)) { // %NN can't start after len-3
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url[o++] = url[i++];
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continue;
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}
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int msd = hex2dec(url[i + 1]),
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lsd = hex2dec(url[i + 2]);
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if (msd >= 0 && lsd >= 0) {
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url[o++] = 16 * msd + lsd;
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i += 3;
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} else {
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url[o++] = url[i++];
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url[o++] = url[i++];
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url[o++] = url[i++];
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}
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}
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}
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static const char hex_digits[] = "0123456789ABCDEF";
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static const char url_default_ok[] = "abcdefghijklmnopqrstuvwxyz"
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"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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"0123456789"
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"-._~";
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// Escape according to http://tools.ietf.org/html/rfc3986#section-2.1
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// Only unreserved characters are not escaped.
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// The argument ok (if not NULL) is as follows:
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// ok[0] != '~': additional characters that are not escaped
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// ok[0] == '~': do not escape anything but these characters
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// (can't override the unreserved characters, which are
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// never escaped)
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char *mp_url_escape(void *talloc_ctx, const char *url, const char *ok)
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{
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char *rv = talloc_size(talloc_ctx, strlen(url) * 3 + 1);
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char *out = rv;
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bool negate = ok && ok[0] == '~';
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for (char c; (c = *url); url++) {
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bool as_is = negate ? !strchr(ok + 1, c)
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: (strchr(url_default_ok, c) || (ok && strchr(ok, c)));
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if (as_is) {
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*out++ = c;
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} else {
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unsigned char v = c;
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*out++ = '%';
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*out++ = hex_digits[v / 16];
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*out++ = hex_digits[v % 16];
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}
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}
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*out = 0;
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return rv;
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}
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static const char *match_proto(const char *url, const char *proto)
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{
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int l = strlen(proto);
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if (l > 0) {
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if (strncasecmp(url, proto, l) == 0 && strncmp("://", url + l, 3) == 0)
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return url + l + 3;
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} else if (!mp_is_url(bstr0(url))) {
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return url; // pure filenames
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}
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return NULL;
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}
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// src and new are both STREAM_ORIGIN_* values. This checks whether a stream
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// with flags "new" can be opened from the "src". On success, return
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// new origin, on incompatibility return 0.
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static int check_origin(int src, int new)
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{
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switch (src) {
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case STREAM_ORIGIN_DIRECT:
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case STREAM_ORIGIN_UNSAFE:
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// Allow anything, but constrain it to the new origin.
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return new;
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case STREAM_ORIGIN_FS:
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// From unix FS, allow all but unsafe.
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if (new == STREAM_ORIGIN_FS || new == STREAM_ORIGIN_NET)
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return new;
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break;
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case STREAM_ORIGIN_NET:
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// Allow only other network links.
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if (new == STREAM_ORIGIN_NET)
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return new;
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break;
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}
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return 0;
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}
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// Read len bytes from the start position, and wrap around as needed. Limit the
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// actually read data to the size of the buffer. Return amount of copied bytes.
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// len: max bytes to copy to dst
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// pos: index into s->buffer[], e.g. s->buf_start is byte 0
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// returns: bytes copied to dst (limited by len and available buffered data)
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static int ring_copy(struct stream *s, void *dst, int len, int pos)
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{
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assert(len >= 0);
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if (pos < s->buf_start || pos > s->buf_end)
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return 0;
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int copied = 0;
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len = MPMIN(len, s->buf_end - pos);
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if (len && pos <= s->buffer_mask) {
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int copy = MPMIN(len, s->buffer_mask + 1 - pos);
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memcpy(dst, &s->buffer[pos], copy);
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copied += copy;
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len -= copy;
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pos += copy;
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}
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if (len) {
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memcpy((char *)dst + copied, &s->buffer[pos & s->buffer_mask], len);
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copied += len;
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}
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return copied;
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}
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// Resize the current stream buffer. Uses a larger size if needed to keep data.
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// Does nothing if the size is adequate. Calling this with 0 ensures it uses the
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// default buffer size if possible.
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// The caller must check whether enough data was really allocated.
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// keep: keep at least [buf_end-keep, buf_end] (used for assert()s only)
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// new: new total size of buffer
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// returns: false if buffer allocation failed, true if reallocated or size ok
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static bool stream_resize_buffer(struct stream *s, int keep, int new)
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{
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assert(keep >= s->buf_end - s->buf_cur);
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assert(keep <= new);
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new = MPMAX(new, s->requested_buffer_size);
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new = MPMIN(new, STREAM_MAX_BUFFER_SIZE);
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new = mp_round_next_power_of_2(new);
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assert(keep <= new); // can't fail (if old buffer size was valid)
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if (new == s->buffer_mask + 1)
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return true;
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int old_pos = s->buf_cur - s->buf_start;
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int old_used_len = s->buf_end - s->buf_start;
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int skip = old_used_len > new ? old_used_len - new : 0;
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MP_DBG(s, "resize stream to %d bytes, drop %d bytes\n", new, skip);
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void *nbuf = ta_alloc_size(s, new);
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if (!nbuf)
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return false; // oom; tolerate it, caller needs to check if required
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int new_len = 0;
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if (s->buffer)
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new_len = ring_copy(s, nbuf, new, s->buf_start + skip);
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assert(new_len == old_used_len - skip);
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assert(old_pos >= skip); // "keep" too low
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assert(old_pos - skip <= new_len);
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s->buf_start = 0;
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s->buf_cur = old_pos - skip;
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s->buf_end = new_len;
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ta_free(s->buffer);
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s->buffer = nbuf;
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s->buffer_mask = new - 1;
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return true;
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}
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static int stream_create_instance(const stream_info_t *sinfo,
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struct stream_open_args *args,
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struct stream **ret)
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{
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const char *url = args->url;
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int flags = args->flags;
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*ret = NULL;
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const char *path = url;
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if (flags & STREAM_LOCAL_FS_ONLY) {
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if (!sinfo->local_fs)
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return STREAM_NO_MATCH;
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} else {
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for (int n = 0; sinfo->protocols && sinfo->protocols[n]; n++) {
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path = match_proto(url, sinfo->protocols[n]);
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if (path)
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break;
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}
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if (!path)
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return STREAM_NO_MATCH;
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}
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stream_t *s = talloc_zero(NULL, stream_t);
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s->global = args->global;
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struct stream_opts *opts = mp_get_config_group(s, s->global, &stream_conf);
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if (flags & STREAM_SILENT) {
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s->log = mp_null_log;
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} else {
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s->log = mp_log_new(s, s->global->log, sinfo->name);
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}
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s->info = sinfo;
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s->cancel = args->cancel;
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s->url = talloc_strdup(s, url);
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s->path = talloc_strdup(s, path);
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s->mode = flags & (STREAM_READ | STREAM_WRITE);
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s->requested_buffer_size = opts->buffer_size;
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if (flags & STREAM_LESS_NOISE)
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mp_msg_set_max_level(s->log, MSGL_WARN);
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bool opt;
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mp_read_option_raw(s->global, "access-references", &m_option_type_bool, &opt);
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s->access_references = opt;
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MP_VERBOSE(s, "Opening %s\n", url);
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if (strlen(url) > INT_MAX / 8) {
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MP_ERR(s, "URL too large.\n");
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talloc_free(s);
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return STREAM_ERROR;
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}
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if ((s->mode & STREAM_WRITE) && !sinfo->can_write) {
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MP_DBG(s, "No write access implemented.\n");
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talloc_free(s);
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return STREAM_NO_MATCH;
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}
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s->stream_origin = flags & STREAM_ORIGIN_MASK; // pass through by default
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if (opts->load_unsafe_playlists) {
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s->stream_origin = STREAM_ORIGIN_DIRECT;
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} else if (sinfo->stream_origin) {
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s->stream_origin = check_origin(s->stream_origin, sinfo->stream_origin);
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}
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if (!s->stream_origin) {
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talloc_free(s);
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return STREAM_UNSAFE;
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}
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int r = STREAM_UNSUPPORTED;
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if (sinfo->open2) {
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r = sinfo->open2(s, args);
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} else if (!args->special_arg) {
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r = (sinfo->open)(s);
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}
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if (r != STREAM_OK) {
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talloc_free(s);
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return r;
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}
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if (!stream_resize_buffer(s, 0, 0)) {
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free_stream(s);
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return STREAM_ERROR;
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}
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assert(s->seekable == !!s->seek);
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if (s->mime_type)
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MP_VERBOSE(s, "Mime-type: '%s'\n", s->mime_type);
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MP_DBG(s, "Stream opened successfully.\n");
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*ret = s;
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return STREAM_OK;
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}
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int stream_create_with_args(struct stream_open_args *args, struct stream **ret)
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{
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assert(args->url);
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int r = STREAM_NO_MATCH;
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*ret = NULL;
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// Open stream proper
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if (args->sinfo) {
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r = stream_create_instance(args->sinfo, args, ret);
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} else {
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for (int i = 0; i < MP_ARRAY_SIZE(stream_list); i++) {
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r = stream_create_instance(stream_list[i], args, ret);
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if (r == STREAM_OK)
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break;
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if (r == STREAM_NO_MATCH || r == STREAM_UNSUPPORTED)
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continue;
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if (r == STREAM_UNSAFE)
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continue;
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break;
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}
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}
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if (!*ret && !(args->flags & STREAM_SILENT) && !mp_cancel_test(args->cancel))
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{
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struct mp_log *log = mp_log_new(NULL, args->global->log, "!stream");
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if (r == STREAM_UNSAFE) {
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mp_err(log, "\nRefusing to load potentially unsafe URL from a playlist.\n"
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"Use the --load-unsafe-playlists option to load it anyway.\n\n");
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} else if (r == STREAM_NO_MATCH || r == STREAM_UNSUPPORTED) {
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mp_err(log, "No protocol handler found to open URL %s\n", args->url);
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mp_err(log, "The protocol is either unsupported, or was disabled "
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"at compile-time.\n");
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} else {
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mp_err(log, "Failed to open %s.\n", args->url);
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}
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talloc_free(log);
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}
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return r;
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}
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struct stream *stream_create(const char *url, int flags,
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struct mp_cancel *c, struct mpv_global *global)
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{
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struct stream_open_args args = {
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.global = global,
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.cancel = c,
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.flags = flags,
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.url = url,
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};
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struct stream *s;
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stream_create_with_args(&args, &s);
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return s;
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}
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stream_t *open_output_stream(const char *filename, struct mpv_global *global)
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{
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return stream_create(filename, STREAM_ORIGIN_DIRECT | STREAM_WRITE,
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NULL, global);
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}
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// Read function bypassing the local stream buffer. This will not write into
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// s->buffer, but into buf[0..len] instead.
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// Returns 0 on error or EOF, and length of bytes read on success.
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// Partial reads are possible, even if EOF is not reached.
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static int stream_read_unbuffered(stream_t *s, void *buf, int len)
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{
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assert(len >= 0);
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if (len <= 0)
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return 0;
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int res = 0;
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// we will retry even if we already reached EOF previously.
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if (s->fill_buffer && !mp_cancel_test(s->cancel))
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res = s->fill_buffer(s, buf, len);
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if (res <= 0) {
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s->eof = 1;
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return 0;
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}
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assert(res <= len);
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// When reading succeeded we are obviously not at eof.
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s->eof = 0;
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s->pos += res;
|
|
s->total_unbuffered_read_bytes += res;
|
|
return res;
|
|
}
|
|
|
|
// Ask for having at most "forward" bytes ready to read in the buffer.
|
|
// To read everything, you may have to call this in a loop.
|
|
// forward: desired amount of bytes in buffer after s->cur_pos
|
|
// returns: progress (false on EOF or on OOM or if enough data was available)
|
|
static bool stream_read_more(struct stream *s, int forward)
|
|
{
|
|
assert(forward >= 0);
|
|
|
|
int forward_avail = s->buf_end - s->buf_cur;
|
|
if (forward_avail >= forward)
|
|
return false;
|
|
|
|
// Avoid that many small reads will lead to many low-level read calls.
|
|
forward = MPMAX(forward, s->requested_buffer_size / 2);
|
|
assert(forward_avail < forward);
|
|
|
|
// Keep guaranteed seek-back.
|
|
int buf_old = MPMIN(s->buf_cur - s->buf_start, s->requested_buffer_size / 2);
|
|
|
|
if (!stream_resize_buffer(s, buf_old + forward_avail, buf_old + forward))
|
|
return false;
|
|
|
|
int buf_alloc = s->buffer_mask + 1;
|
|
|
|
assert(s->buf_start <= s->buf_cur);
|
|
assert(s->buf_cur <= s->buf_end);
|
|
assert(s->buf_cur < buf_alloc * 2);
|
|
assert(s->buf_end < buf_alloc * 2);
|
|
assert(s->buf_start < buf_alloc);
|
|
|
|
// Note: read as much as possible, even if forward is much smaller. Do
|
|
// this because the stream buffer is supposed to set an approx. minimum
|
|
// read size on it.
|
|
int read = buf_alloc - (buf_old + forward_avail); // free buffer past end
|
|
|
|
int pos = s->buf_end & s->buffer_mask;
|
|
read = MPMIN(read, buf_alloc - pos);
|
|
|
|
// Note: if wrap-around happens, we need to make two calls. This may
|
|
// affect latency (e.g. waiting for new data on a socket), so do only
|
|
// 1 read call always.
|
|
read = stream_read_unbuffered(s, &s->buffer[pos], read);
|
|
|
|
s->buf_end += read;
|
|
|
|
// May have overwritten old data.
|
|
if (s->buf_end - s->buf_start >= buf_alloc) {
|
|
assert(s->buf_end >= buf_alloc);
|
|
|
|
s->buf_start = s->buf_end - buf_alloc;
|
|
|
|
assert(s->buf_start <= s->buf_cur);
|
|
assert(s->buf_cur <= s->buf_end);
|
|
|
|
if (s->buf_start >= buf_alloc) {
|
|
s->buf_start -= buf_alloc;
|
|
s->buf_cur -= buf_alloc;
|
|
s->buf_end -= buf_alloc;
|
|
}
|
|
}
|
|
|
|
// Must not have overwritten guaranteed old data.
|
|
assert(s->buf_cur - s->buf_start >= buf_old);
|
|
|
|
if (s->buf_cur < s->buf_end)
|
|
s->eof = 0;
|
|
|
|
return !!read;
|
|
}
|
|
|
|
// Read between 1..buf_size bytes of data, return how much data has been read.
|
|
// Return 0 on EOF, error, or if buf_size was 0.
|
|
int stream_read_partial(stream_t *s, void *buf, int buf_size)
|
|
{
|
|
assert(s->buf_cur <= s->buf_end);
|
|
assert(buf_size >= 0);
|
|
if (s->buf_cur == s->buf_end && buf_size > 0) {
|
|
if (buf_size > (s->buffer_mask + 1) / 2) {
|
|
// Direct read if the buffer is too small anyway.
|
|
stream_drop_buffers(s);
|
|
return stream_read_unbuffered(s, buf, buf_size);
|
|
}
|
|
stream_read_more(s, 1);
|
|
}
|
|
int res = ring_copy(s, buf, buf_size, s->buf_cur);
|
|
s->buf_cur += res;
|
|
return res;
|
|
}
|
|
|
|
// Slow version of stream_read_char(); called by it if the buffer is empty.
|
|
int stream_read_char_fallback(stream_t *s)
|
|
{
|
|
uint8_t c;
|
|
return stream_read_partial(s, &c, 1) ? c : -256;
|
|
}
|
|
|
|
int stream_read(stream_t *s, void *mem, int total)
|
|
{
|
|
int len = total;
|
|
while (len > 0) {
|
|
int read = stream_read_partial(s, mem, len);
|
|
if (read <= 0)
|
|
break; // EOF
|
|
mem = (char *)mem + read;
|
|
len -= read;
|
|
}
|
|
total -= len;
|
|
return total;
|
|
}
|
|
|
|
// Read ahead so that at least forward_size bytes are readable ahead. Returns
|
|
// the actual forward amount available (restricted by EOF or buffer limits).
|
|
int stream_peek(stream_t *s, int forward_size)
|
|
{
|
|
while (stream_read_more(s, forward_size)) {}
|
|
return s->buf_end - s->buf_cur;
|
|
}
|
|
|
|
// Like stream_read(), but do not advance the current position. This may resize
|
|
// the buffer to satisfy the read request.
|
|
int stream_read_peek(stream_t *s, void *buf, int buf_size)
|
|
{
|
|
stream_peek(s, buf_size);
|
|
return ring_copy(s, buf, buf_size, s->buf_cur);
|
|
}
|
|
|
|
int stream_write_buffer(stream_t *s, void *buf, int len)
|
|
{
|
|
if (!s->write_buffer)
|
|
return -1;
|
|
int orig_len = len;
|
|
while (len) {
|
|
int w = s->write_buffer(s, buf, len);
|
|
if (w <= 0)
|
|
return -1;
|
|
s->pos += w;
|
|
buf = (char *)buf + w;
|
|
len -= w;
|
|
}
|
|
return orig_len;
|
|
}
|
|
|
|
// Drop len bytes form input, possibly reading more until all is skipped. If
|
|
// EOF or an error was encountered before all could be skipped, return false,
|
|
// otherwise return true.
|
|
static bool stream_skip_read(struct stream *s, int64_t len)
|
|
{
|
|
while (len > 0) {
|
|
unsigned int left = s->buf_end - s->buf_cur;
|
|
if (!left) {
|
|
if (!stream_read_more(s, 1))
|
|
return false;
|
|
continue;
|
|
}
|
|
unsigned skip = MPMIN(len, left);
|
|
s->buf_cur += skip;
|
|
len -= skip;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
// Drop the internal buffer. Note that this will advance the stream position
|
|
// (as seen by stream_tell()), because the real stream position is ahead of the
|
|
// logical stream position by the amount of buffered but not yet read data.
|
|
void stream_drop_buffers(stream_t *s)
|
|
{
|
|
s->pos = stream_tell(s);
|
|
s->buf_start = s->buf_cur = s->buf_end = 0;
|
|
s->eof = 0;
|
|
stream_resize_buffer(s, 0, 0);
|
|
}
|
|
|
|
// Seek function bypassing the local stream buffer.
|
|
static bool stream_seek_unbuffered(stream_t *s, int64_t newpos)
|
|
{
|
|
if (newpos != s->pos) {
|
|
MP_VERBOSE(s, "stream level seek from %" PRId64 " to %" PRId64 "\n",
|
|
s->pos, newpos);
|
|
|
|
s->total_stream_seeks++;
|
|
|
|
if (newpos > s->pos && !s->seekable) {
|
|
MP_ERR(s, "Cannot seek forward in this stream\n");
|
|
return false;
|
|
}
|
|
if (newpos < s->pos && !s->seekable) {
|
|
MP_ERR(s, "Cannot seek backward in linear streams!\n");
|
|
return false;
|
|
}
|
|
if (s->seek(s, newpos) <= 0) {
|
|
int level = mp_cancel_test(s->cancel) ? MSGL_V : MSGL_ERR;
|
|
MP_MSG(s, level, "Seek failed (to %lld, size %lld)\n",
|
|
(long long)newpos, (long long)stream_get_size(s));
|
|
return false;
|
|
}
|
|
stream_drop_buffers(s);
|
|
s->pos = newpos;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool stream_seek(stream_t *s, int64_t pos)
|
|
{
|
|
MP_TRACE(s, "seek request from %" PRId64 " to %" PRId64 "\n",
|
|
stream_tell(s), pos);
|
|
|
|
s->eof = 0; // eof should be set only on read; seeking always clears it
|
|
|
|
if (pos < 0) {
|
|
MP_ERR(s, "Invalid seek to negative position %lld!\n", (long long)pos);
|
|
pos = 0;
|
|
}
|
|
|
|
if (pos <= s->pos) {
|
|
int64_t x = pos - (s->pos - (int)s->buf_end);
|
|
if (x >= (int)s->buf_start) {
|
|
s->buf_cur = x;
|
|
assert(s->buf_cur >= s->buf_start);
|
|
assert(s->buf_cur <= s->buf_end);
|
|
return true;
|
|
}
|
|
}
|
|
|
|
if (s->mode == STREAM_WRITE)
|
|
return s->seekable && s->seek(s, pos);
|
|
|
|
// Skip data instead of performing a seek in some cases.
|
|
if (pos >= s->pos &&
|
|
((!s->seekable && s->fast_skip) ||
|
|
pos - s->pos <= s->requested_buffer_size))
|
|
{
|
|
return stream_skip_read(s, pos - stream_tell(s));
|
|
}
|
|
|
|
return stream_seek_unbuffered(s, pos);
|
|
}
|
|
|
|
// Like stream_seek(), but strictly prefer skipping data instead of failing, if
|
|
// it's a forward-seek.
|
|
bool stream_seek_skip(stream_t *s, int64_t pos)
|
|
{
|
|
uint64_t cur_pos = stream_tell(s);
|
|
|
|
if (cur_pos == pos)
|
|
return true;
|
|
|
|
return !s->seekable && pos > cur_pos
|
|
? stream_skip_read(s, pos - cur_pos)
|
|
: stream_seek(s, pos);
|
|
}
|
|
|
|
int stream_control(stream_t *s, int cmd, void *arg)
|
|
{
|
|
return s->control ? s->control(s, cmd, arg) : STREAM_UNSUPPORTED;
|
|
}
|
|
|
|
// Return the current size of the stream, or a negative value if unknown.
|
|
int64_t stream_get_size(stream_t *s)
|
|
{
|
|
return s->get_size ? s->get_size(s) : -1;
|
|
}
|
|
|
|
void free_stream(stream_t *s)
|
|
{
|
|
if (!s)
|
|
return;
|
|
|
|
if (s->close)
|
|
s->close(s);
|
|
talloc_free(s);
|
|
}
|
|
|
|
static const char *const bom[3] = {"\xEF\xBB\xBF", "\xFF\xFE", "\xFE\xFF"};
|
|
|
|
// Return utf16 argument for stream_read_line
|
|
int stream_skip_bom(struct stream *s)
|
|
{
|
|
char buf[4];
|
|
int len = stream_read_peek(s, buf, sizeof(buf));
|
|
bstr data = {buf, len};
|
|
for (int n = 0; n < 3; n++) {
|
|
if (bstr_startswith0(data, bom[n])) {
|
|
stream_seek_skip(s, stream_tell(s) + strlen(bom[n]));
|
|
return n;
|
|
}
|
|
}
|
|
return -1; // default to 8 bit codepages
|
|
}
|
|
|
|
// Read the rest of the stream into memory (current pos to EOF), and return it.
|
|
// talloc_ctx: used as talloc parent for the returned allocation
|
|
// max_size: must be set to >0. If the file is larger than that, it is treated
|
|
// as error. This is a minor robustness measure.
|
|
// returns: stream contents, or .start/.len set to NULL on error
|
|
// If the file was empty, but no error happened, .start will be non-NULL and
|
|
// .len will be 0.
|
|
// For convenience, the returned buffer is padded with a 0 byte. The padding
|
|
// is not included in the returned length.
|
|
struct bstr stream_read_complete(struct stream *s, void *talloc_ctx,
|
|
int max_size)
|
|
{
|
|
if (max_size > 1000000000)
|
|
abort();
|
|
|
|
int bufsize;
|
|
int total_read = 0;
|
|
int padding = 1;
|
|
char *buf = NULL;
|
|
int64_t size = stream_get_size(s) - stream_tell(s);
|
|
if (size > max_size)
|
|
return (struct bstr){NULL, 0};
|
|
if (size > 0)
|
|
bufsize = size + padding;
|
|
else
|
|
bufsize = 1000;
|
|
while (1) {
|
|
buf = talloc_realloc_size(talloc_ctx, buf, bufsize);
|
|
int readsize = stream_read(s, buf + total_read, bufsize - total_read);
|
|
total_read += readsize;
|
|
if (total_read < bufsize)
|
|
break;
|
|
if (bufsize > max_size) {
|
|
talloc_free(buf);
|
|
return (struct bstr){NULL, 0};
|
|
}
|
|
bufsize = MPMIN(bufsize + (bufsize >> 1), max_size + padding);
|
|
}
|
|
buf = talloc_realloc_size(talloc_ctx, buf, total_read + padding);
|
|
memset(&buf[total_read], 0, padding);
|
|
return (struct bstr){buf, total_read};
|
|
}
|
|
|
|
struct bstr stream_read_file(const char *filename, void *talloc_ctx,
|
|
struct mpv_global *global, int max_size)
|
|
{
|
|
struct bstr res = {0};
|
|
int flags = STREAM_ORIGIN_DIRECT | STREAM_READ | STREAM_LOCAL_FS_ONLY |
|
|
STREAM_LESS_NOISE;
|
|
stream_t *s = stream_create(filename, flags, NULL, global);
|
|
if (s) {
|
|
res = stream_read_complete(s, talloc_ctx, max_size);
|
|
free_stream(s);
|
|
}
|
|
return res;
|
|
}
|
|
|
|
char **stream_get_proto_list(void)
|
|
{
|
|
char **list = NULL;
|
|
int num = 0;
|
|
for (int i = 0; i < MP_ARRAY_SIZE(stream_list); i++) {
|
|
const stream_info_t *stream_info = stream_list[i];
|
|
|
|
if (!stream_info->protocols)
|
|
continue;
|
|
|
|
for (int j = 0; stream_info->protocols[j]; j++) {
|
|
if (*stream_info->protocols[j] == '\0')
|
|
continue;
|
|
|
|
MP_TARRAY_APPEND(NULL, list, num,
|
|
talloc_strdup(NULL, stream_info->protocols[j]));
|
|
}
|
|
}
|
|
MP_TARRAY_APPEND(NULL, list, num, NULL);
|
|
return list;
|
|
}
|
|
|
|
void stream_print_proto_list(struct mp_log *log)
|
|
{
|
|
int count = 0;
|
|
|
|
mp_info(log, "Protocols:\n\n");
|
|
char **list = stream_get_proto_list();
|
|
for (int i = 0; list[i]; i++) {
|
|
mp_info(log, " %s://\n", list[i]);
|
|
count++;
|
|
talloc_free(list[i]);
|
|
}
|
|
talloc_free(list);
|
|
mp_info(log, "\nTotal: %d protocols\n", count);
|
|
}
|
|
|
|
bool stream_has_proto(const char *proto)
|
|
{
|
|
for (int i = 0; i < MP_ARRAY_SIZE(stream_list); i++) {
|
|
const stream_info_t *stream_info = stream_list[i];
|
|
|
|
for (int j = 0; stream_info->protocols && stream_info->protocols[j]; j++) {
|
|
if (strcmp(stream_info->protocols[j], proto) == 0)
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|