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mpv/demux/demux_mkv_timeline.c
wm4 d6bf3880d7 demux_mkv: warn against some other aspects of mismatching codec data 
Such files violate the specification. Unfortunately, I could not test
whether it really works correctly, since I don't have a sample at hand
that is not broken in this regard.
2020-08-16 01:00:29 +02:00

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/*
* This file is part of mpv.
*
* mpv is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* mpv 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#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 "mpv_talloc.h"
#include "common/msg.h"
#include "demux/demux.h"
#include "demux/timeline.h"
#include "demux/matroska.h"
#include "options/m_config.h"
#include "options/options.h"
#include "options/path.h"
#include "misc/bstr.h"
#include "misc/thread_tools.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 MPOpts *opts;
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_bstr(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_timeline = true,
.stream_flags = ctx->tl->stream_origin,
};
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);
if (!uid->edition) {
m->uid.edition = 0;
} else {
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);
}
}
ctx->sources[i] = d;
return true;
}
}
demux_free(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->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->tl->cancel, ctx->global);
talloc_steal(tmp, pl);
for (int n = 0; n < pl->num_entries; n++) {
MP_TARRAY_APPEND(tmp, filenames, num_filenames,
pl->entries[n]->filename);
}
} else if (!ctx->demuxer->stream->is_local_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;
}
// Copy attachments from referenced sources so fonts are loaded for sub
// rendering.
for (int i = 1; i < ctx->num_sources; i++) {
for (int j = 0; j < ctx->sources[i]->num_attachments; j++) {
struct demux_attachment *att = &ctx->sources[i]->attachments[j];
demuxer_add_attachment(ctx->demuxer, att->name, att->type,
att->data, att->data_size);
}
}
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->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].metadata = talloc_zero(chapters, struct mp_tags);
mp_tags_set_str(chapters[i].metadata, "title", 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->uid.edition) {
uint64_t source_full_length = linked_source->duration * 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 tl_ctx *tl, struct demuxer *mainsrc)
{
for (int n = 0; n < tl->num_parts; n++) {
struct timeline_part *p = &tl->timeline[n];
if (p->source == mainsrc)
continue;
int num_source_streams = demux_get_num_stream(p->source);
for (int i = 0; i < num_source_streams; i++) {
struct sh_stream *s = demux_get_stream(p->source, 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);
}
}
int num_main_streams = demux_get_num_stream(mainsrc);
for (int i = 0; i < num_main_streams; i++) {
struct sh_stream *m = demux_get_stream(mainsrc, 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 (strcmp(s->codec->codec, m->codec->codec) != 0)
MP_WARN(tl, "Timeline segments have mismatching codec.\n");
if (s->codec->extradata_size != m->codec->extradata_size ||
(s->codec->extradata_size &&
memcmp(s->codec->extradata, m->codec->extradata,
s->codec->extradata_size) != 0))
MP_WARN(tl, "Timeline segments have mismatching codec info.\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;
struct tl_ctx *ctx = talloc_ptrtype(tl, ctx);
*ctx = (struct tl_ctx){
.log = tl->log,
.global = tl->global,
.tl = tl,
.demuxer = demuxer,
.opts = mp_get_config_group(ctx, tl->global, &mp_opt_root),
};
if (!ctx->opts->ordered_chapters || !demuxer->access_references) {
MP_INFO(demuxer, "File uses ordered chapters, but "
"you have disabled support for them. Ignoring.\n");
talloc_free(ctx);
return;
}
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);
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: filter out all "unset" chapters.
for (int n = m->num_ordered_chapters - 1; n >= 0; n--) {
if (!chapters[n].metadata)
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);
}
for (int n = 0; n < ctx->num_parts; n++) {
ctx->timeline[n].end = n == ctx->num_parts - 1
? ctx->start_time / 1e9
: ctx->timeline[n + 1].start;
};
/* 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);
}
// With Matroska, the "master" file usually dictates track layout etc.,
// except maybe with playlist-like files.
struct demuxer *track_layout = ctx->timeline[0].source;
for (int n = 0; n < ctx->num_parts; n++) {
if (ctx->timeline[n].source == ctx->demuxer) {
track_layout = ctx->demuxer;
break;
}
}
check_track_compatibility(ctx, track_layout);
tl->sources = ctx->sources;
tl->num_sources = ctx->num_sources;
struct timeline_par *par = talloc_ptrtype(tl, par);
*par = (struct timeline_par){
.parts = ctx->timeline,
.num_parts = ctx->num_parts,
.track_layout = track_layout,
};
MP_TARRAY_APPEND(tl, tl->pars, tl->num_pars, par);
tl->chapters = chapters;
tl->num_chapters = m->num_ordered_chapters;
tl->meta = track_layout;
tl->format = "mkv_oc";
}
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