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mpv/demux/demux_mkv_timeline.c
wm4 9349cfca91 demux_mkv_timeline: fix potential issue when enabling cache 
If the cache is enabled, the demuxer is closed and opened again (because
currently, the cache can not be enabled atfer data was already read).
The call for opening a new demuxer uses the same params struct, which
references the ctx->uids array. But there is a MP_TARRAY_GROW()
invocation somewhere on the way, which can reallocate the ctx->uids
array, making params.uids a dangling pointer.

This issue probably existed for a longer time, probably since 5cd33853
(slightly more obvious since f50b105d).
2015-02-25 13:31:37 +01:00

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/*
* This file is part of MPlayer.
*
* MPlayer is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* MPlayer is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with MPlayer; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <stdlib.h>
#include <stdbool.h>
#include <inttypes.h>
#include <assert.h>
#include <dirent.h>
#include <string.h>
#include <strings.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <libavutil/common.h>
#include "osdep/io.h"
#include "talloc.h"
#include "common/msg.h"
#include "common/global.h"
#include "demux/demux.h"
#include "demux/timeline.h"
#include "demux/matroska.h"
#include "options/options.h"
#include "options/path.h"
#include "misc/bstr.h"
#include "common/common.h"
#include "common/playlist.h"
#include "stream/stream.h"
struct tl_ctx {
struct mp_log *log;
struct mpv_global *global;
struct timeline *tl;
struct demuxer *demuxer;
struct demuxer **sources;
int num_sources;
struct timeline_part *timeline;
int num_parts;
struct matroska_segment_uid *uids;
uint64_t start_time; // When the next part should start on the complete timeline.
uint64_t missing_time; // Total missing time so far.
uint64_t last_end_time; // When the last part ended on the complete timeline.
int num_chapters; // Total number of expected chapters.
};
struct find_entry {
char *name;
int matchlen;
off_t size;
};
static int cmp_entry(const void *pa, const void *pb)
{
const struct find_entry *a = pa, *b = pb;
// check "similar" filenames first
int matchdiff = b->matchlen - a->matchlen;
if (matchdiff)
return FFSIGN(matchdiff);
// check small files first
off_t sizediff = a->size - b->size;
if (sizediff)
return FFSIGN(sizediff);
return 0;
}
static bool test_matroska_ext(const char *filename)
{
static const char *const exts[] = {".mkv", ".mka", ".mks", ".mk3d", NULL};
for (int n = 0; exts[n]; n++) {
const char *suffix = exts[n];
int offset = strlen(filename) - strlen(suffix);
// name must end with suffix
if (offset > 0 && strcasecmp(filename + offset, suffix) == 0)
return true;
}
return false;
}
static char **find_files(const char *original_file)
{
void *tmpmem = talloc_new(NULL);
char *basename = mp_basename(original_file);
struct bstr directory = mp_dirname(original_file);
char **results = talloc_size(NULL, 0);
char *dir_zero = bstrdup0(tmpmem, directory);
DIR *dp = opendir(dir_zero);
if (!dp) {
talloc_free(tmpmem);
return results;
}
struct find_entry *entries = NULL;
struct dirent *ep;
int num_results = 0;
while ((ep = readdir(dp))) {
if (!test_matroska_ext(ep->d_name))
continue;
// don't list the original name
if (!strcmp(ep->d_name, basename))
continue;
char *name = mp_path_join(results, directory, bstr0(ep->d_name));
char *s1 = ep->d_name;
char *s2 = basename;
int matchlen = 0;
while (*s1 && *s1++ == *s2++)
matchlen++;
// be a bit more fuzzy about matching the filename
matchlen = (matchlen + 3) / 5;
struct stat statbuf;
if (stat(name, &statbuf) != 0)
continue;
off_t size = statbuf.st_size;
entries = talloc_realloc(tmpmem, entries, struct find_entry,
num_results + 1);
entries[num_results] = (struct find_entry) { name, matchlen, size };
num_results++;
}
closedir(dp);
// NOTE: maybe should make it compare pointers instead
if (entries)
qsort(entries, num_results, sizeof(struct find_entry), cmp_entry);
results = talloc_realloc(NULL, results, char *, num_results);
for (int i = 0; i < num_results; i++) {
results[i] = entries[i].name;
}
talloc_free(tmpmem);
return results;
}
static bool has_source_request(struct tl_ctx *ctx,
struct matroska_segment_uid *new_uid)
{
for (int i = 0; i < ctx->num_sources; ++i) {
if (demux_matroska_uid_cmp(&ctx->uids[i], new_uid))
return true;
}
return false;
}
// segment = get Nth segment of a multi-segment file
static bool check_file_seg(struct tl_ctx *ctx, char *filename, int segment)
{
bool was_valid = false;
struct demuxer_params params = {
.force_format = "mkv",
.matroska_num_wanted_uids = ctx->num_sources,
.matroska_wanted_uids = ctx->uids,
.matroska_wanted_segment = segment,
.matroska_was_valid = &was_valid,
.disable_cache = true,
};
struct mp_cancel *cancel = ctx->tl->cancel;
if (mp_cancel_test(cancel))
return false;
struct demuxer *d = demux_open_url(filename, &params, cancel, ctx->global);
if (!d)
return false;
struct matroska_data *m = &d->matroska_data;
for (int i = 1; i < ctx->num_sources; i++) {
struct matroska_segment_uid *uid = &ctx->uids[i];
if (ctx->sources[i])
continue;
/* Accept the source if the segment uid matches and the edition
* either matches or isn't specified. */
if (!memcmp(uid->segment, m->uid.segment, 16) &&
(!uid->edition || uid->edition == m->uid.edition))
{
MP_INFO(ctx, "Match for source %d: %s\n", i, d->filename);
for (int j = 0; j < m->num_ordered_chapters; j++) {
struct matroska_chapter *c = m->ordered_chapters + j;
if (!c->has_segment_uid)
continue;
if (has_source_request(ctx, &c->uid))
continue;
/* Set the requested segment. */
MP_TARRAY_GROW(NULL, ctx->uids, ctx->num_sources);
ctx->uids[ctx->num_sources] = c->uid;
/* Add a new source slot. */
MP_TARRAY_APPEND(NULL, ctx->sources, ctx->num_sources, NULL);
}
if (stream_wants_cache(d->stream, &ctx->global->opts->stream_cache))
{
free_demuxer_and_stream(d);
params.disable_cache = false;
params.matroska_wanted_uids = ctx->uids; // potentially reallocated, same data
d = demux_open_url(filename, &params, cancel, ctx->global);
if (!d)
continue;
}
ctx->sources[i] = d;
return true;
}
}
free_demuxer_and_stream(d);
return was_valid;
}
static void check_file(struct tl_ctx *ctx, char *filename, int first)
{
for (int segment = first; ; segment++) {
if (!check_file_seg(ctx, filename, segment))
break;
}
}
static bool missing(struct tl_ctx *ctx)
{
for (int i = 0; i < ctx->num_sources; i++) {
if (!ctx->sources[i])
return true;
}
return false;
}
static void find_ordered_chapter_sources(struct tl_ctx *ctx)
{
struct MPOpts *opts = ctx->global->opts;
void *tmp = talloc_new(NULL);
int num_filenames = 0;
char **filenames = NULL;
if (ctx->num_sources > 1) {
char *main_filename = ctx->demuxer->filename;
MP_INFO(ctx, "This file references data from other sources.\n");
if (opts->ordered_chapters_files && opts->ordered_chapters_files[0]) {
MP_INFO(ctx, "Loading references from '%s'.\n",
opts->ordered_chapters_files);
struct playlist *pl =
playlist_parse_file(opts->ordered_chapters_files, ctx->global);
talloc_steal(tmp, pl);
for (struct playlist_entry *e = pl->first; e; e = e->next)
MP_TARRAY_APPEND(tmp, filenames, num_filenames, e->filename);
} else if (ctx->demuxer->stream->uncached_type != STREAMTYPE_FILE) {
MP_WARN(ctx, "Playback source is not a "
"normal disk file. Will not search for related files.\n");
} else {
MP_INFO(ctx, "Will scan other files in the "
"same directory to find referenced sources.\n");
filenames = find_files(main_filename);
num_filenames = MP_TALLOC_AVAIL(filenames);
talloc_steal(tmp, filenames);
}
// Possibly get further segments appended to the first segment
check_file(ctx, main_filename, 1);
}
int old_source_count;
do {
old_source_count = ctx->num_sources;
for (int i = 0; i < num_filenames; i++) {
if (!missing(ctx))
break;
MP_VERBOSE(ctx, "Checking file %s\n", filenames[i]);
check_file(ctx, filenames[i], 0);
}
} while (old_source_count != ctx->num_sources);
if (missing(ctx)) {
MP_ERR(ctx, "Failed to find ordered chapter part!\n");
int j = 1;
for (int i = 1; i < ctx->num_sources; i++) {
if (ctx->sources[i]) {
ctx->sources[j] = ctx->sources[i];
ctx->uids[j] = ctx->uids[i];
j++;
}
}
ctx->num_sources = j;
}
talloc_free(tmp);
}
struct inner_timeline_info {
uint64_t skip; // Amount of time to skip.
uint64_t limit; // How much time is expected for the parent chapter.
};
static int64_t add_timeline_part(struct tl_ctx *ctx,
struct demuxer *source,
uint64_t start)
{
/* Merge directly adjacent parts. We allow for a configurable fudge factor
* because of files which specify chapter end times that are one frame too
* early; we don't want to try seeking over a one frame gap. */
int64_t join_diff = start - ctx->last_end_time;
if (ctx->num_parts == 0
|| FFABS(join_diff) > ctx->global->opts->chapter_merge_threshold * 1e6
|| source != ctx->timeline[ctx->num_parts - 1].source)
{
struct timeline_part new = {
.start = ctx->start_time / 1e9,
.source_start = start / 1e9,
.source = source,
};
MP_TARRAY_APPEND(NULL, ctx->timeline, ctx->num_parts, new);
} else if (ctx->num_parts > 0 && join_diff) {
// Chapter was merged at an inexact boundary; adjust timestamps to match.
MP_VERBOSE(ctx, "Merging timeline part %d with offset %g ms.\n",
ctx->num_parts, join_diff / 1e6);
ctx->start_time += join_diff;
return join_diff;
}
return 0;
}
static void build_timeline_loop(struct tl_ctx *ctx,
struct demux_chapter *chapters,
struct inner_timeline_info *info,
int current_source)
{
uint64_t local_starttime = 0;
struct demuxer *source = ctx->sources[current_source];
struct matroska_data *m = &source->matroska_data;
for (int i = 0; i < m->num_ordered_chapters; i++) {
struct matroska_chapter *c = m->ordered_chapters + i;
uint64_t chapter_length = c->end - c->start;
if (!c->has_segment_uid)
c->uid = m->uid;
local_starttime += chapter_length;
// If we're before the start time for the chapter, skip to the next one.
if (local_starttime <= info->skip)
continue;
/* Look for the source for this chapter. */
for (int j = 0; j < ctx->num_sources; j++) {
struct demuxer *linked_source = ctx->sources[j];
struct matroska_data *linked_m = &linked_source->matroska_data;
if (!demux_matroska_uid_cmp(&c->uid, &linked_m->uid))
continue;
if (!info->limit) {
if (i >= ctx->num_chapters)
break; // malformed files can cause this to happen.
chapters[i].pts = ctx->start_time / 1e9;
chapters[i].name = talloc_strdup(chapters, c->name);
}
/* If we're the source or it's a non-ordered edition reference,
* just add a timeline part from the source. */
if (current_source == j || !linked_m->num_ordered_chapters) {
uint64_t source_full_length =
demuxer_get_time_length(linked_source) * 1e9;
uint64_t source_length = source_full_length - c->start;
int64_t join_diff = 0;
/* If the chapter starts after the end of a source, there's
* nothing we can get from it. Instead, mark the entire chapter
* as missing and make the chapter length 0. */
if (source_full_length <= c->start) {
ctx->missing_time += chapter_length;
chapter_length = 0;
goto found;
}
/* If the source length starting at the chapter start is
* shorter than the chapter it is supposed to fill, add the gap
* to missing_time. Also, modify the chapter length to be what
* we actually have to avoid playing off the end of the file
* and not switching to the next source. */
if (source_length < chapter_length) {
ctx->missing_time += chapter_length - source_length;
chapter_length = source_length;
}
join_diff = add_timeline_part(ctx, linked_source, c->start);
/* If we merged two chapters into a single part due to them
* being off by a few frames, we need to change the limit to
* avoid chopping the end of the intended chapter (the adding
* frames case) or showing extra content (the removing frames
* case). Also update chapter_length to incorporate the extra
* time. */
if (info->limit) {
info->limit += join_diff;
chapter_length += join_diff;
}
} else {
/* We have an ordered edition as the source. Since this
* can jump around all over the place, we need to build up the
* timeline parts for each of its chapters, but not add them as
* chapters. */
struct inner_timeline_info new_info = {
.skip = c->start,
.limit = c->end
};
build_timeline_loop(ctx, chapters, &new_info, j);
// Already handled by the loop call.
chapter_length = 0;
}
ctx->last_end_time = c->end;
goto found;
}
ctx->missing_time += chapter_length;
chapter_length = 0;
found:;
ctx->start_time += chapter_length;
/* If we're after the limit on this chapter, stop here. */
if (info->limit && local_starttime >= info->limit) {
/* Back up the global start time by the overflow. */
ctx->start_time -= local_starttime - info->limit;
break;
}
}
/* If we stopped before the limit, add up the missing time. */
if (local_starttime < info->limit)
ctx->missing_time += info->limit - local_starttime;
}
static void check_track_compatibility(struct timeline *tl)
{
struct demuxer *mainsrc = tl->track_layout;
for (int n = 0; n < tl->num_parts; n++) {
struct timeline_part *p = &tl->parts[n];
if (p->source == mainsrc)
continue;
for (int i = 0; i < p->source->num_streams; i++) {
struct sh_stream *s = p->source->streams[i];
if (s->attached_picture)
continue;
if (!demuxer_stream_by_demuxer_id(mainsrc, s->type, s->demuxer_id)) {
MP_WARN(tl, "Source %s has %s stream with TID=%d, which "
"is not present in the ordered chapters main "
"file. This is a broken file. "
"The additional stream is ignored.\n",
p->source->filename, stream_type_name(s->type),
s->demuxer_id);
}
}
for (int i = 0; i < mainsrc->num_streams; i++) {
struct sh_stream *m = mainsrc->streams[i];
if (m->attached_picture)
continue;
struct sh_stream *s =
demuxer_stream_by_demuxer_id(p->source, m->type, m->demuxer_id);
if (s) {
// There are actually many more things that in theory have to
// match (though mpv's implementation doesn't care).
if (s->codec && m->codec && strcmp(s->codec, m->codec) != 0)
MP_WARN(tl, "Timeline segments have mismatching codec.\n");
} else {
MP_WARN(tl, "Source %s lacks %s stream with TID=%d, which "
"is present in the ordered chapters main "
"file. This is a broken file.\n",
p->source->filename, stream_type_name(m->type),
m->demuxer_id);
}
}
}
}
void build_ordered_chapter_timeline(struct timeline *tl)
{
struct demuxer *demuxer = tl->demuxer;
if (!demuxer->matroska_data.ordered_chapters)
return;
if (!demuxer->global->opts->ordered_chapters) {
MP_INFO(demuxer, "File uses ordered chapters, but "
"you have disabled support for them. Ignoring.\n");
return;
}
struct tl_ctx *ctx = talloc_ptrtype(tl, ctx);
*ctx = (struct tl_ctx){
.log = tl->log,
.global = tl->global,
.tl = tl,
.demuxer = demuxer,
};
MP_INFO(ctx, "File uses ordered chapters, will build edit timeline.\n");
struct matroska_data *m = &demuxer->matroska_data;
// +1 because sources/uid_map[0] is original file even if all chapters
// actually use other sources and need separate entries
ctx->sources = talloc_zero_array(tl, struct demuxer *,
m->num_ordered_chapters + 1);
ctx->sources[0] = demuxer;
ctx->num_sources = 1;
ctx->uids = talloc_zero_array(NULL, struct matroska_segment_uid,
m->num_ordered_chapters + 1);
ctx->uids[0] = m->uid;
ctx->uids[0].edition = 0;
for (int i = 0; i < m->num_ordered_chapters; i++) {
struct matroska_chapter *c = m->ordered_chapters + i;
/* If there isn't a segment uid, we are the source. If the segment uid
* is our segment uid and the edition matches. We can't accept the
* "don't care" edition value of 0 since the user may have requested a
* non-default edition. */
if (!c->has_segment_uid || demux_matroska_uid_cmp(&c->uid, &m->uid))
continue;
if (has_source_request(ctx, &c->uid))
continue;
ctx->uids[ctx->num_sources] = c->uid;
ctx->sources[ctx->num_sources] = NULL;
ctx->num_sources++;
}
find_ordered_chapter_sources(ctx);
talloc_free(ctx->uids);
ctx->uids = NULL;
struct demux_chapter *chapters =
talloc_zero_array(tl, struct demux_chapter, m->num_ordered_chapters);
// Stupid hack, because fuck everything.
for (int n = 0; n < m->num_ordered_chapters; n++)
chapters[n].pts = -1;
ctx->timeline = talloc_array_ptrtype(tl, ctx->timeline, 0);
ctx->num_chapters = m->num_ordered_chapters;
struct inner_timeline_info info = {
.skip = 0,
.limit = 0
};
build_timeline_loop(ctx, chapters, &info, 0);
// Fuck everything (2): filter out all "unset" chapters.
for (int n = m->num_ordered_chapters - 1; n >= 0; n--) {
if (chapters[n].pts == -1)
MP_TARRAY_REMOVE_AT(chapters, m->num_ordered_chapters, n);
}
if (!ctx->num_parts) {
// None of the parts come from the file itself???
// Broken file, but we need at least 1 valid timeline part - add a dummy.
MP_WARN(ctx, "Ordered chapters file with no parts?\n");
struct timeline_part new = {
.source = demuxer,
};
MP_TARRAY_APPEND(NULL, ctx->timeline, ctx->num_parts, new);
}
struct timeline_part new = {
.start = ctx->start_time / 1e9,
};
MP_TARRAY_APPEND(NULL, ctx->timeline, ctx->num_parts, new);
/* Ignore anything less than a millisecond when reporting missing time. If
* users really notice less than a millisecond missing, maybe this can be
* revisited. */
if (ctx->missing_time >= 1e6) {
MP_ERR(ctx, "There are %.3f seconds missing from the timeline!\n",
ctx->missing_time / 1e9);
}
tl->sources = ctx->sources;
tl->num_sources = ctx->num_sources;
tl->parts = ctx->timeline;
tl->num_parts = ctx->num_parts - 1; // minus termination
tl->chapters = chapters;
tl->num_chapters = m->num_ordered_chapters;
// With Matroska, the "master" file usually dictates track layout etc.,
// except maybe with playlist-like files.
tl->track_layout = tl->parts[0].source;
for (int n = 0; n < tl->num_parts; n++) {
if (tl->parts[n].source == ctx->demuxer) {
tl->track_layout = ctx->demuxer;
break;
}
}
check_track_compatibility(tl);
}
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