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mirror of https://github.com/mpv-player/mpv synced 2024-12-23 23:32:26 +00:00
mpv/demux/demux_cue.c
wm4 1890529857 demux: get rid of DEMUXER_CTRL_GET_TIME_LENGTH
Similar purpose as f34e1a0dee.

Somehow this is much more natural too, and needs less code.

This breaks runtime updates to duration. This could easily be fixed, but
no important demuxer does this anyway. Only demux_raw and demux_disc
might (the latter for BD/DVD). For the latter it might actually have
some importance when changing titles at runtime (I guess?), but guess
what, I don't care.
2017-06-20 14:22:10 +02:00

277 lines
8.5 KiB
C

/*
* Original author: Uoti Urpala
*
* 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 <string.h>
#include <dirent.h>
#include <inttypes.h>
#include "osdep/io.h"
#include "mpv_talloc.h"
#include "misc/bstr.h"
#include "common/msg.h"
#include "demux/demux.h"
#include "options/path.h"
#include "common/common.h"
#include "stream/stream.h"
#include "timeline.h"
#include "cue.h"
#define PROBE_SIZE 512
struct priv {
struct cue_file *f;
};
static void add_source(struct timeline *tl, struct demuxer *d)
{
MP_TARRAY_APPEND(tl, tl->sources, tl->num_sources, d);
}
static bool try_open(struct timeline *tl, char *filename)
{
struct bstr bfilename = bstr0(filename);
// Avoid trying to open itself or another .cue file. Best would be
// to check the result of demuxer auto-detection, but the demuxer
// API doesn't allow this without opening a full demuxer.
if (bstr_case_endswith(bfilename, bstr0(".cue"))
|| bstrcasecmp(bstr0(tl->demuxer->filename), bfilename) == 0)
return false;
struct demuxer *d = demux_open_url(filename, NULL, tl->cancel, tl->global);
// Since .bin files are raw PCM data with no headers, we have to explicitly
// open them. Also, try to avoid to open files that are most likely not .bin
// files, as that would only play noise. Checking the file extension is
// fragile, but it's about the only way we have.
// TODO: maybe also could check if the .bin file is a multiple of the Audio
// CD sector size (2352 bytes)
if (!d && bstr_case_endswith(bfilename, bstr0(".bin"))) {
MP_WARN(tl, "CUE: Opening as BIN file!\n");
struct demuxer_params p = {.force_format = "rawaudio"};
d = demux_open_url(filename, &p, tl->cancel, tl->global);
}
if (d) {
add_source(tl, d);
return true;
}
MP_ERR(tl, "Could not open source '%s'!\n", filename);
return false;
}
static bool open_source(struct timeline *tl, char *filename)
{
void *ctx = talloc_new(NULL);
bool res = false;
struct bstr dirname = mp_dirname(tl->demuxer->filename);
struct bstr base_filename = bstr0(mp_basename(filename));
if (!base_filename.len) {
MP_WARN(tl, "CUE: Invalid audio filename in .cue file!\n");
} else {
char *fullname = mp_path_join_bstr(ctx, dirname, base_filename);
if (try_open(tl, fullname)) {
res = true;
goto out;
}
}
// Try an audio file with the same name as the .cue file (but different
// extension).
// Rationale: this situation happens easily if the audio file or both files
// are renamed.
struct bstr cuefile =
bstr_strip_ext(bstr0(mp_basename(tl->demuxer->filename)));
DIR *d = opendir(bstrdup0(ctx, dirname));
if (!d)
goto out;
struct dirent *de;
while ((de = readdir(d))) {
char *dename0 = de->d_name;
struct bstr dename = bstr0(dename0);
if (bstr_case_startswith(dename, cuefile)) {
MP_WARN(tl, "CUE: No useful audio filename "
"in .cue file found, trying with '%s' instead!\n",
dename0);
if (try_open(tl, mp_path_join_bstr(ctx, dirname, dename))) {
res = true;
break;
}
}
}
closedir(d);
out:
talloc_free(ctx);
if (!res)
MP_ERR(tl, "CUE: Could not open audio file!\n");
return res;
}
static void build_timeline(struct timeline *tl)
{
struct priv *p = tl->demuxer->priv;
void *ctx = talloc_new(NULL);
add_source(tl, tl->demuxer);
struct cue_track *tracks = NULL;
size_t track_count = 0;
for (size_t n = 0; n < p->f->num_tracks; n++) {
struct cue_track *track = &p->f->tracks[n];
if (track->filename) {
MP_TARRAY_APPEND(ctx, tracks, track_count, *track);
} else {
MP_WARN(tl->demuxer, "No file specified for track entry %zd. "
"It will be removed\n", n + 1);
}
}
if (track_count == 0) {
MP_ERR(tl, "CUE: no tracks found!\n");
goto out;
}
// Remove duplicate file entries. This might be too sophisticated, since
// CUE files usually use either separate files for every single track, or
// only one file for all tracks.
char **files = 0;
size_t file_count = 0;
for (size_t n = 0; n < track_count; n++) {
struct cue_track *track = &tracks[n];
track->source = -1;
for (size_t file = 0; file < file_count; file++) {
if (strcmp(files[file], track->filename) == 0) {
track->source = file;
break;
}
}
if (track->source == -1) {
file_count++;
files = talloc_realloc(ctx, files, char *, file_count);
files[file_count - 1] = track->filename;
track->source = file_count - 1;
}
}
for (size_t i = 0; i < file_count; i++) {
if (!open_source(tl, files[i]))
goto out;
}
struct timeline_part *timeline = talloc_array_ptrtype(tl, timeline,
track_count + 1);
struct demux_chapter *chapters = talloc_array_ptrtype(tl, chapters,
track_count);
double starttime = 0;
for (int i = 0; i < track_count; i++) {
struct demuxer *source = tl->sources[1 + tracks[i].source];
double duration;
if (i + 1 < track_count && tracks[i].source == tracks[i + 1].source) {
duration = tracks[i + 1].start - tracks[i].start;
} else {
duration = source->duration;
// Two cases: 1) last track of a single-file cue, or 2) any track of
// a multi-file cue. We need to do this for 1) only because the
// timeline needs to be terminated with the length of the last
// track.
duration -= tracks[i].start;
}
if (duration < 0) {
MP_WARN(tl, "CUE: Can't get duration of source file!\n");
// xxx: do something more reasonable
duration = 0.0;
}
timeline[i] = (struct timeline_part) {
.start = starttime,
.source_start = tracks[i].start,
.source = source,
};
chapters[i] = (struct demux_chapter) {
.pts = timeline[i].start,
.metadata = mp_tags_dup(tl, tracks[i].tags),
};
starttime += duration;
}
// apparently we need this to give the last part a non-zero length
timeline[track_count] = (struct timeline_part) {
.start = starttime,
// perhaps unused by the timeline code
.source_start = 0,
.source = timeline[0].source,
};
tl->parts = timeline;
// the last part is not included it in the count
tl->num_parts = track_count + 1 - 1;
tl->chapters = chapters;
tl->num_chapters = track_count;
tl->track_layout = tl->parts[0].source;
out:
talloc_free(ctx);
}
static int try_open_file(struct demuxer *demuxer, enum demux_check check)
{
if (!demuxer->access_references)
return -1;
struct stream *s = demuxer->stream;
if (check >= DEMUX_CHECK_UNSAFE) {
bstr d = stream_peek(s, PROBE_SIZE);
if (d.len < 1 || !mp_probe_cue(d))
return -1;
}
struct priv *p = talloc_zero(demuxer, struct priv);
demuxer->priv = p;
demuxer->fully_read = true;
bstr data = stream_read_complete(s, p, 1000000);
if (data.start == NULL)
return -1;
p->f = mp_parse_cue(data);
talloc_steal(p, p->f);
if (!p->f) {
MP_ERR(demuxer, "error parsing input file!\n");
return -1;
}
mp_tags_merge(demuxer->metadata, p->f->tags);
return 0;
}
const struct demuxer_desc demuxer_desc_cue = {
.name = "cue",
.desc = "CUE sheet",
.open = try_open_file,
.load_timeline = build_timeline,
};