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mpv/core/timeline/tl_matroska.c
wm4 8b017c73c4 core: matroska: support concatenated segments 
Matroska files can contain multiple segments, which are literally
further Matroska files appended to the main file. They can be referenced
by segment linking.

While this is an extraordinarily useless and dumb feature, we support it
for the hell of it.

This is implemented by adding a further demuxer parameter for skipping
segments. When scanning for linked segments, each file is opened
multiple times, until there are no further segments found. Each segment
will have a separate demuxer instance (with a separate file handle
etc.).

It appears the Matroska spec. has an even worse feature for segments:
live streaming can completely reconfigure the stream by starting a new
segment. We won't add support for it, because there are 0 people on this
earth who think Matroska life streaming is a good idea. (As opposed to
serving Matroska/WebM files via HTTP.)
2013-04-20 23:28:23 +02:00

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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 <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <libavutil/common.h>
#include "osdep/io.h"
#include "talloc.h"
#include "core/mp_core.h"
#include "core/mp_msg.h"
#include "demux/demux.h"
#include "core/path.h"
#include "core/bstr.h"
#include "core/mp_common.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 char **find_files(const char *original_file, const char *suffix)
{
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))) {
int suffix_offset = strlen(ep->d_name) - strlen(suffix);
// name must end with suffix
if (suffix_offset < 0 || strcmp(ep->d_name + suffix_offset, suffix))
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 struct demuxer *open_demuxer(struct stream *stream,
struct MPContext *mpctx, char *filename, struct demuxer_params *params)
{
return demux_open_withparams(&mpctx->opts, stream,
DEMUXER_TYPE_MATROSKA, NULL, mpctx->opts.audio_id,
mpctx->opts.video_id, mpctx->opts.sub_id, filename, params);
}
static int enable_cache(struct MPContext *mpctx, struct stream **stream,
struct demuxer **demuxer, struct demuxer_params *params)
{
struct MPOpts *opts = &mpctx->opts;
if (!(opts->stream_cache_size > 0 ||
opts->stream_cache_size < 0 && (*stream)->cache_size))
return 0;
char *filename = talloc_strdup(NULL, (*demuxer)->filename);
free_demuxer(*demuxer);
free_stream(*stream);
int format = 0;
*stream = open_stream(filename, &mpctx->opts, &format);
if (!*stream) {
talloc_free(filename);
return -1;
}
stream_enable_cache_percent(*stream,
opts->stream_cache_size,
opts->stream_cache_min_percent,
opts->stream_cache_seek_min_percent);
*demuxer = open_demuxer(*stream, mpctx, filename, params);
if (!*demuxer) {
talloc_free(filename);
free_stream(*stream);
return -1;
}
talloc_free(filename);
return 1;
}
// segment = get Nth segment of a multi-segment file
static bool check_file_seg(struct MPContext *mpctx, struct demuxer **sources,
int num_sources, unsigned char uid_map[][16],
char *filename, int segment)
{
bool was_valid = false;
struct demuxer_params params = {
.matroska_wanted_uids = uid_map,
.matroska_wanted_segment = segment,
.matroska_was_valid = &was_valid,
};
int format = 0;
struct stream *s = open_stream(filename, &mpctx->opts, &format);
if (!s)
return false;
struct demuxer *d = open_demuxer(s, mpctx, filename, &params);
if (!d) {
free_stream(s);
return was_valid;
}
if (d->file_format == DEMUXER_TYPE_MATROSKA) {
for (int i = 1; i < num_sources; i++) {
if (sources[i])
continue;
if (!memcmp(uid_map[i], d->matroska_data.segment_uid, 16)) {
mp_msg(MSGT_CPLAYER, MSGL_INFO, "Match for source %d: %s\n",
i, d->filename);
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, unsigned char uid_map[][16],
char *filename, int first)
{
for (int segment = first; ; segment++) {
if (!check_file_seg(mpctx, sources, num_sources, uid_map,
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,
unsigned char uid_map[][16])
{
int num_filenames = 0;
char **filenames = NULL;
if (num_sources > 1) {
char *main_filename = mpctx->demuxer->filename;
mp_msg(MSGT_CPLAYER, MSGL_INFO, "This file references data from "
"other sources.\n");
if (mpctx->demuxer->stream->type != STREAMTYPE_FILE) {
mp_msg(MSGT_CPLAYER, MSGL_WARN, "Playback source is not a "
"normal disk file. Will not search for related files.\n");
} else {
mp_msg(MSGT_CPLAYER, MSGL_INFO, "Will scan other files in the "
"same directory to find referenced sources.\n");
filenames = find_files(main_filename, ".mkv");
num_filenames = MP_TALLOC_ELEMS(filenames);
}
// Possibly get further segments appended to the first segment
check_file(mpctx, sources, num_sources, uid_map, main_filename, 1);
}
for (int i = 0; i < num_filenames; i++) {
if (!missing(sources, num_sources))
break;
mp_msg(MSGT_CPLAYER, MSGL_INFO, "Checking file %s\n", filenames[i]);
check_file(mpctx, sources, num_sources, uid_map, filenames[i], 0);
}
talloc_free(filenames);
if (missing(sources, num_sources)) {
mp_msg(MSGT_CPLAYER, MSGL_ERR, "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]) {
sources[j] = sources[i];
memcpy(uid_map[j], uid_map[i], 16);
j++;
}
num_sources = j;
}
return num_sources;
}
void build_ordered_chapter_timeline(struct MPContext *mpctx)
{
struct MPOpts *opts = &mpctx->opts;
if (!opts->ordered_chapters) {
mp_msg(MSGT_CPLAYER, MSGL_INFO, "File uses ordered chapters, but "
"you have disabled support for them. Ignoring.\n");
return;
}
mp_msg(MSGT_CPLAYER, MSGL_INFO, "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_array_ptrtype(NULL, sources,
m->num_ordered_chapters+1);
sources[0] = mpctx->demuxer;
unsigned char (*uid_map)[16] = talloc_array_ptrtype(NULL, uid_map,
m->num_ordered_chapters + 1);
int num_sources = 1;
memcpy(uid_map[0], m->segment_uid, 16);
for (int i = 0; i < m->num_ordered_chapters; i++) {
struct matroska_chapter *c = m->ordered_chapters + i;
if (!c->has_segment_uid)
memcpy(c->segment_uid, m->segment_uid, 16);
for (int j = 0; j < num_sources; j++)
if (!memcmp(c->segment_uid, uid_map[j], 16))
goto found1;
memcpy(uid_map[num_sources], c->segment_uid, 16);
sources[num_sources] = NULL;
num_sources++;
found1:
;
}
num_sources = find_ordered_chapter_sources(mpctx, sources, num_sources,
uid_map);
// +1 for terminating chapter with start time marking end of last real one
struct timeline_part *timeline = talloc_array_ptrtype(NULL, timeline,
m->num_ordered_chapters + 1);
struct chapter *chapters = talloc_array_ptrtype(NULL, chapters,
m->num_ordered_chapters);
uint64_t starttime = 0;
uint64_t missing_time = 0;
int part_count = 0;
int num_chapters = 0;
uint64_t prev_part_offset = 0;
for (int i = 0; i < m->num_ordered_chapters; i++) {
struct matroska_chapter *c = m->ordered_chapters + i;
int j;
for (j = 0; j < num_sources; j++) {
if (!memcmp(c->segment_uid, uid_map[j], 16))
goto found2;
}
missing_time += c->end - c->start;
continue;
found2:;
/* 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 = c->start - starttime - prev_part_offset;
if (part_count == 0
|| FFABS(join_diff) > opts->chapter_merge_threshold * 1000000
|| sources[j] != timeline[part_count - 1].source) {
timeline[part_count].source = sources[j];
timeline[part_count].start = starttime / 1e9;
timeline[part_count].source_start = c->start / 1e9;
prev_part_offset = c->start - starttime;
part_count++;
} else if (part_count > 0 && join_diff) {
/* Chapter was merged at an inexact boundary;
* adjust timestamps to match. */
mp_msg(MSGT_CPLAYER, MSGL_V, "Merging timeline part %d with "
"offset %g ms.\n", i, join_diff / 1e6);
starttime += join_diff;
}
chapters[num_chapters].start = starttime / 1e9;
chapters[num_chapters].name = talloc_strdup(chapters, c->name);
starttime += c->end - c->start;
num_chapters++;
}
timeline[part_count].start = starttime / 1e9;
talloc_free(uid_map);
if (!part_count) {
// None of the parts come from the file itself???
talloc_free(sources);
talloc_free(timeline);
talloc_free(chapters);
return;
}
if (missing_time)
mp_msg(MSGT_CPLAYER, MSGL_ERR, "There are %.3f seconds missing "
"from the timeline!\n", missing_time / 1e9);
mpctx->sources = sources;
mpctx->num_sources = num_sources;
mpctx->timeline = timeline;
mpctx->num_timeline_parts = part_count;
mpctx->num_chapters = num_chapters;
mpctx->chapters = chapters;
}
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