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mpv/demux/demux_cue.c

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/*
* This file is part of MPlayer.
*
* Original author: Uoti Urpala
*
* 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 <string.h>
#include <dirent.h>
#include <inttypes.h>
#include "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"
#define PROBE_SIZE 512
#define SECS_PER_CUE_FRAME (1.0/75.0)
enum cue_command {
CUE_ERROR = -1, // not a valid CUE command, or an unknown extension
CUE_EMPTY, // line with whitespace only
CUE_UNUSED, // valid CUE command, but ignored by this code
CUE_FILE,
CUE_TRACK,
CUE_INDEX,
CUE_TITLE,
};
static const struct {
enum cue_command command;
const char *text;
} cue_command_strings[] = {
{ CUE_FILE, "FILE" },
{ CUE_TRACK, "TRACK" },
{ CUE_INDEX, "INDEX" },
{ CUE_TITLE, "TITLE" },
{ CUE_UNUSED, "CATALOG" },
{ CUE_UNUSED, "CDTEXTFILE" },
{ CUE_UNUSED, "FLAGS" },
{ CUE_UNUSED, "ISRC" },
{ CUE_UNUSED, "PERFORMER" },
{ CUE_UNUSED, "POSTGAP" },
{ CUE_UNUSED, "PREGAP" },
{ CUE_UNUSED, "REM" },
{ CUE_UNUSED, "SONGWRITER" },
{ CUE_UNUSED, "MESSAGE" },
{ -1 },
};
struct cue_track {
double pregap_start; // corresponds to INDEX 00
double start; // corresponds to INDEX 01
struct bstr filename;
int source;
struct bstr title;
};
struct priv {
bstr data;
};
static enum cue_command read_cmd(struct bstr *data, struct bstr *out_params)
{
struct bstr line = bstr_strip_linebreaks(bstr_getline(*data, data));
line = bstr_lstrip(line);
if (line.len == 0)
return CUE_EMPTY;
for (int n = 0; cue_command_strings[n].command != -1; n++) {
struct bstr name = bstr0(cue_command_strings[n].text);
if (bstr_startswith(line, name)) {
struct bstr rest = bstr_cut(line, name.len);
if (rest.len && !strchr(WHITESPACE, rest.start[0]))
continue;
if (out_params)
*out_params = rest;
return cue_command_strings[n].command;
}
}
return CUE_ERROR;
}
static bool eat_char(struct bstr *data, char ch)
{
if (data->len && data->start[0] == ch) {
*data = bstr_cut(*data, 1);
return true;
} else {
return false;
}
}
static struct bstr read_quoted(struct bstr *data)
{
*data = bstr_lstrip(*data);
if (!eat_char(data, '"'))
return (struct bstr) {0};
int end = bstrchr(*data, '"');
if (end < 0)
return (struct bstr) {0};
struct bstr res = bstr_splice(*data, 0, end);
*data = bstr_cut(*data, end + 1);
return res;
}
// Read a 2 digit unsigned decimal integer.
// Return -1 on failure.
static int read_int_2(struct bstr *data)
{
*data = bstr_lstrip(*data);
if (data->len && data->start[0] == '-')
return -1;
struct bstr s = *data;
int res = (int)bstrtoll(s, &s, 10);
if (data->len == s.len || data->len - s.len > 2)
return -1;
*data = s;
return res;
}
static double read_time(struct bstr *data)
{
struct bstr s = *data;
bool ok = true;
double t1 = read_int_2(&s);
ok = eat_char(&s, ':') && ok;
double t2 = read_int_2(&s);
ok = eat_char(&s, ':') && ok;
double t3 = read_int_2(&s);
ok = ok && t1 >= 0 && t2 >= 0 && t3 >= 0;
return ok ? t1 * 60.0 + t2 + t3 * SECS_PER_CUE_FRAME : 0;
}
static struct bstr skip_utf8_bom(struct bstr data)
{
return bstr_startswith0(data, "\xEF\xBB\xBF") ? bstr_cut(data, 3) : data;
}
// Check if the text in data is most likely CUE data. This is used by the
// demuxer code to check the file type.
// data is the start of the probed file, possibly cut off at a random point.
static bool mp_probe_cue(struct bstr data)
{
bool valid = false;
data = skip_utf8_bom(data);
for (;;) {
enum cue_command cmd = read_cmd(&data, NULL);
// End reached. Since the line was most likely cut off, don't use the
// result of the last parsing call.
if (data.len == 0)
break;
if (cmd == CUE_ERROR)
return false;
if (cmd != CUE_EMPTY)
valid = true;
}
return valid;
}
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 stream *s = stream_create(filename, STREAM_READ, tl->cancel, tl->global);
if (!s)
return false;
struct demuxer *d = demux_open(s, NULL, 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(s, &p, tl->global);
}
if (d) {
add_source(tl, d);
return true;
}
MP_ERR(tl, "Could not open source '%s'!\n", filename);
free_stream(s);
return false;
}
static bool open_source(struct timeline *tl, struct bstr filename)
{
void *ctx = talloc_new(NULL);
bool res = false;
struct bstr dirname = mp_dirname(tl->demuxer->filename);
struct bstr base_filename = bstr0(mp_basename(bstrdup0(ctx, filename)));
if (!base_filename.len) {
MP_WARN(tl, "CUE: Invalid audio filename in .cue file!\n");
} else {
char *fullname = mp_path_join(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(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;
}
// return length of the source in seconds, or -1 if unknown
static double source_get_length(struct demuxer *demuxer)
{
double get_time_ans;
// <= 0 means DEMUXER_CTRL_NOTIMPL or DEMUXER_CTRL_DONTKNOW
if (demuxer && demux_control(demuxer, DEMUXER_CTRL_GET_TIME_LENGTH,
(void *) &get_time_ans) > 0)
{
return get_time_ans;
} else {
return -1;
}
}
static void build_timeline(struct timeline *tl)
{
struct priv *p = tl->demuxer->priv;
void *ctx = talloc_new(NULL);
add_source(tl, tl->demuxer);
struct bstr data = p->data;
data = skip_utf8_bom(data);
struct cue_track *tracks = NULL;
size_t track_count = 0;
struct bstr filename = {0};
// Global metadata, and copied into new tracks.
struct cue_track proto_track = {0};
struct cue_track *cur_track = &proto_track;
while (data.len) {
struct bstr param;
switch (read_cmd(&data, &param)) {
case CUE_ERROR:
MP_ERR(tl, "CUE: error parsing input file!\n");
goto out;
case CUE_TRACK: {
track_count++;
tracks = talloc_realloc(ctx, tracks, struct cue_track, track_count);
cur_track = &tracks[track_count - 1];
*cur_track = proto_track;
break;
}
case CUE_TITLE:
cur_track->title = read_quoted(&param);
break;
case CUE_INDEX: {
int type = read_int_2(&param);
double time = read_time(&param);
if (type == 1) {
cur_track->start = time;
cur_track->filename = filename;
} else if (type == 0) {
cur_track->pregap_start = time;
}
break;
}
case CUE_FILE:
// NOTE: FILE comes before TRACK, so don't use cur_track->filename
filename = read_quoted(&param);
break;
}
}
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.
struct bstr *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 (bstrcmp(files[file], track->filename) == 0) {
track->source = file;
break;
}
}
if (track->source == -1) {
file_count++;
files = talloc_realloc(ctx, files, struct bstr, 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_get_length(source);
// 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,
// might want to include other metadata here
.name = bstrdup0(chapters, tracks[i].title),
};
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)
{
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;
p->data = stream_read_complete(s, demuxer, 1000000);
if (p->data.start == NULL)
return -1;
return 0;
}
const struct demuxer_desc demuxer_desc_cue = {
.name = "cue",
.desc = "CUE sheet",
.open = try_open_file,
.load_timeline = build_timeline,
};
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