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mpv/player/timeline/tl_matroska.c

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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 "player/core.h"
#include "common/msg.h"
#include "demux/demux.h"
#include "options/path.h"
#include "misc/bstr.h"
#include "common/common.h"
#include "common/playlist.h"
#include "stream/stream.h"
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 int enable_cache(struct MPContext *mpctx, struct stream **stream,
struct demuxer **demuxer, struct demuxer_params *params)
{
struct MPOpts *opts = mpctx->opts;
if (!stream_wants_cache(*stream, &opts->stream_cache))
return 0;
char *filename = talloc_strdup(NULL, (*demuxer)->filename);
free_demuxer(*demuxer);
free_stream(*stream);
*stream = stream_open(filename, mpctx->global);
if (!*stream) {
talloc_free(filename);
return -1;
}
stream_enable_cache(stream, &opts->stream_cache);
*demuxer = demux_open(*stream, "mkv", params, mpctx->global);
if (!*demuxer) {
talloc_free(filename);
free_stream(*stream);
return -1;
}
talloc_free(filename);
return 1;
}
static bool has_source_request(struct matroska_segment_uid *uids,
int num_sources,
struct matroska_segment_uid *new_uid)
{
for (int i = 0; i < num_sources; ++i) {
if (demux_matroska_uid_cmp(uids + i, new_uid))
return true;
}
return false;
}
// segment = get Nth segment of a multi-segment file
static bool check_file_seg(struct MPContext *mpctx, struct demuxer ***sources,
int *num_sources, struct matroska_segment_uid **uids,
char *filename, int segment)
{
bool was_valid = false;
struct demuxer_params params = {
.matroska_num_wanted_uids = *num_sources,
.matroska_wanted_uids = *uids,
.matroska_wanted_segment = segment,
.matroska_was_valid = &was_valid,
};
struct stream *s = stream_open(filename, mpctx->global);
if (!s)
return false;
struct demuxer *d = demux_open(s, "mkv", &params, mpctx->global);
if (!d) {
free_stream(s);
return was_valid;
}
if (d->type == DEMUXER_TYPE_MATROSKA) {
struct matroska_data *m = &d->matroska_data;
for (int i = 1; i < *num_sources; i++) {
struct matroska_segment_uid *uid = *uids + i;
if ((*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(mpctx, "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(*uids, *num_sources, &c->uid))
continue;
/* Set the requested segment. */
MP_TARRAY_GROW(NULL, *uids, *num_sources);
memcpy((*uids) + *num_sources, &c->uid, sizeof(c->uid));
/* Add a new source slot. */
MP_TARRAY_APPEND(NULL, *sources, *num_sources, NULL);
}
if (enable_cache(mpctx, &s, &d, &params) < 0)
continue;
(*sources)[i] = d;
return true;
}
}
}
free_demuxer(d);
free_stream(s);
return was_valid;
}
static void check_file(struct MPContext *mpctx, struct demuxer ***sources,
int *num_sources, struct matroska_segment_uid **uids,
char *filename, int first)
{
for (int segment = first; ; segment++) {
if (!check_file_seg(mpctx, sources, num_sources,
uids, filename, segment))
break;
}
}
static bool missing(struct demuxer **sources, int num_sources)
{
for (int i = 0; i < num_sources; i++) {
if (!sources[i])
return true;
}
return false;
}
static int find_ordered_chapter_sources(struct MPContext *mpctx,
struct demuxer ***sources,
int *num_sources,
struct matroska_segment_uid **uids)
{
struct MPOpts *opts = mpctx->opts;
void *tmp = talloc_new(NULL);
int num_filenames = 0;
char **filenames = NULL;
if (*num_sources > 1) {
char *main_filename = mpctx->demuxer->filename;
MP_INFO(mpctx, "This file references data from "
"other sources.\n");
if (opts->ordered_chapters_files && opts->ordered_chapters_files[0]) {
MP_INFO(mpctx, "Loading references from '%s'.\n",
opts->ordered_chapters_files);
struct playlist *pl =
playlist_parse_file(opts->ordered_chapters_files, mpctx->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 (mpctx->demuxer->stream->uncached_type != STREAMTYPE_FILE) {
MP_WARN(mpctx, "Playback source is not a "
"normal disk file. Will not search for related files.\n");
} else {
MP_INFO(mpctx, "Will scan other files in the "
"same directory to find referenced sources.\n");
filenames = find_files(main_filename);
num_filenames = MP_TALLOC_ELEMS(filenames);
talloc_steal(tmp, filenames);
}
// Possibly get further segments appended to the first segment
check_file(mpctx, sources, num_sources, uids, main_filename, 1);
}
int old_source_count;
do {
old_source_count = *num_sources;
for (int i = 0; i < num_filenames; i++) {
if (!missing(*sources, *num_sources))
break;
MP_INFO(mpctx, "Checking file %s\n", filenames[i]);
check_file(mpctx, sources, num_sources, uids, filenames[i], 0);
}
/* Loop while we have new sources to look for. */
} while (old_source_count != *num_sources);
if (missing(*sources, *num_sources)) {
MP_ERR(mpctx, "Failed to find ordered chapter part!\n"
"There will be parts MISSING from the video!\n");
int j = 1;
for (int i = 1; i < *num_sources; i++)
if ((*sources)[i]) {
struct matroska_segment_uid *source_uid = *uids + i;
struct matroska_segment_uid *target_uid = *uids + j;
(*sources)[j] = (*sources)[i];
memmove(target_uid, source_uid, sizeof(*source_uid));
j++;
}
*num_sources = j;
}
talloc_free(tmp);
return *num_sources;
}
static int64_t add_timeline_part(struct MPContext *mpctx,
struct demuxer *source,
struct timeline_part **timeline,
int *part_count,
uint64_t start,
uint64_t *last_end_time,
uint64_t *starttime)
{
/* Only add a separate part if the time or file actually changes.
* Matroska files have chapter divisions that are redundant from
* timeline point of view because the same chapter structure is used
* both to specify the timeline and for normal chapter information.
* Removing a missing inserted external chapter can also cause this.
* 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 - *last_end_time;
if (*part_count == 0
|| FFABS(join_diff) > mpctx->opts->chapter_merge_threshold * 1e6
|| source != (*timeline)[*part_count - 1].source) {
struct timeline_part new = {
.start = *starttime / 1e9,
.source_start = start / 1e9,
.source = source,
};
MP_TARRAY_APPEND(NULL, *timeline, *part_count, new);
} else if (*part_count > 0 && join_diff) {
/* Chapter was merged at an inexact boundary;
* adjust timestamps to match. */
MP_VERBOSE(mpctx, "Merging timeline part %d with "
"offset %g ms.\n", *part_count, join_diff / 1e6);
*starttime += join_diff;
return join_diff;
}
return 0;
}
static void account_missing_time(struct MPContext *mpctx,
uint64_t *total_time,
uint64_t new_time,
const char *message)
{
if (!new_time)
return;
*total_time += new_time;
MP_INFO(mpctx, "missing %"PRIu64" nanoseconds: %s\n",
new_time, message);
}
static void build_timeline_loop(struct MPContext *mpctx,
struct demuxer **sources,
int num_sources,
int current_source,
uint64_t *starttime,
uint64_t *missing_time,
uint64_t *last_end_time,
struct timeline_part **timeline,
struct chapter *chapters,
int *part_count,
uint64_t skip,
uint64_t limit)
{
uint64_t local_starttime = 0;
struct demuxer *source = 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;
/* Fill in the uid with the current one if one isn't requested. */
if (!c->has_segment_uid)
memcpy(&c->uid, &m->uid, sizeof(c->uid));
/* "Seek" to the end of the chapter. */
local_starttime += chapter_length;
/* If we're before the start time for the chapter, skip to the next
* one. */
if (local_starttime <= skip)
continue;
/* Look for the source for this chapter. */
for (int j = 0; j < num_sources; j++) {
struct demuxer *linked_source = sources[j];
struct matroska_data *linked_m = &linked_source->matroska_data;
/* Skip if the segment or edition isn't acceptable. */
if (!demux_matroska_uid_cmp(&c->uid, &linked_m->uid))
continue;
/* TODO: Add option to support recursive chapters when loading
* recursive ordered chapter editions? If so, more code will be
* needed to add chapters for external non-ordered segment loading
* as well since that part is not recursive. */
if (!limit) {
chapters[i].start = *starttime / 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) {
double source_full_length_seconds = demuxer_get_time_length(linked_source);
/* Some accuracy lost, but not enough to care. (Over one
* million parts, a nanosecond off here could add up to a
* millisecond and trigger a false-positive error message, but
* if that's your biggest problem at that point,
* congratulations. */
uint64_t source_full_length = source_full_length_seconds * 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) {
account_missing_time(mpctx, missing_time, chapter_length,
"referenced segment ends before the requested start time");
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) {
account_missing_time(mpctx, missing_time, chapter_length - source_length,
"referenced segment ends before the requested end time");
chapter_length = source_length;
}
join_diff = add_timeline_part(mpctx, linked_source, timeline, part_count,
c->start, last_end_time, starttime);
/* 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 (limit) {
limit += join_diff;
chapter_length += join_diff;
}
/* Otherwise, 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. */
} else {
build_timeline_loop(mpctx, sources, num_sources, j, starttime,
missing_time, last_end_time, timeline,
chapters, part_count, c->start, c->end);
/* The loop call has added time as needed (we can't add it here
* due to 'join_diff' in the add_timeline_part function. Since
* the time has already been added as needed, the chapter has
* an effective 0 length at this point. */
chapter_length = 0;
}
*last_end_time = c->end;
goto found;
}
/* We're missing a part of the chapter, so add it to the accounting. */
account_missing_time(mpctx, missing_time, chapter_length,
"the source for a chapter could not be found");
/* We don't have the source, but don't leave a gap in the timeline for
* the source. */
chapter_length = 0;
found:;
*starttime += chapter_length;
/* If we're after the limit on this chapter, stop here. */
if (limit && local_starttime >= limit) {
/* Back up the global start time by the overflow. */
*starttime -= local_starttime - limit;
break;
}
}
/* If we stopped before the limit, add up the missing time. */
if (local_starttime < limit)
account_missing_time(mpctx, missing_time, limit - local_starttime,
"nested ordered chapter segment is shorter than the requested end time");
}
void build_ordered_chapter_timeline(struct MPContext *mpctx)
{
struct MPOpts *opts = mpctx->opts;
if (!opts->ordered_chapters) {
MP_INFO(mpctx, "File uses ordered chapters, but "
"you have disabled support for them. Ignoring.\n");
return;
}
MP_INFO(mpctx, "File uses ordered chapters, will build "
"edit timeline.\n");
struct demuxer *demuxer = mpctx->demuxer;
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
struct demuxer **sources = talloc_zero_array(NULL, struct demuxer *,
m->num_ordered_chapters+1);
sources[0] = mpctx->demuxer;
struct matroska_segment_uid *uids =
talloc_zero_array(NULL, struct matroska_segment_uid,
m->num_ordered_chapters + 1);
int num_sources = 1;
memcpy(uids[0].segment, m->uid.segment, 16);
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(uids, num_sources, &c->uid))
continue;
memcpy(uids + num_sources, &c->uid, sizeof(c->uid));
sources[num_sources] = NULL;
num_sources++;
}
num_sources = find_ordered_chapter_sources(mpctx, &sources, &num_sources,
&uids);
talloc_free(uids);
struct timeline_part *timeline = talloc_array_ptrtype(NULL, timeline, 0);
struct chapter *chapters =
talloc_zero_array(NULL, struct chapter, m->num_ordered_chapters);
uint64_t starttime = 0;
uint64_t missing_time = 0;
uint64_t last_end_time = 0;
int part_count = 0;
build_timeline_loop(mpctx, sources, num_sources, 0, &starttime,
&missing_time, &last_end_time, &timeline,
chapters, &part_count, 0, 0);
if (!part_count) {
// None of the parts come from the file itself???
talloc_free(sources);
talloc_free(timeline);
talloc_free(chapters);
return;
}
struct timeline_part new = {
.start = starttime / 1e9,
};
MP_TARRAY_APPEND(NULL, timeline, part_count, 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 (missing_time >= 1e6)
MP_ERR(mpctx, "There are %.3f seconds missing "
"from the timeline!\n", missing_time / 1e9);
talloc_free(mpctx->sources);
mpctx->sources = sources;
mpctx->num_sources = num_sources;
mpctx->timeline = timeline;
mpctx->num_timeline_parts = part_count - 1;
mpctx->num_chapters = m->num_ordered_chapters;
mpctx->chapters = chapters;
}
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