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mpv/mpvcore/timeline/tl_edl.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 <ctype.h>
#include "talloc.h"
#include "mpvcore/mp_core.h"
#include "mpvcore/mp_msg.h"
#include "demux/demux.h"
#include "mpvcore/path.h"
#include "mpvcore/bstr.h"
#include "mpvcore/mp_common.h"
#include "stream/stream.h"
struct edl_source {
struct bstr id;
char *filename;
int lineno;
};
struct edl_time {
int64_t start;
int64_t end;
bool implied_start;
bool implied_end;
};
struct edl_part {
struct edl_time tl;
struct edl_time src;
int64_t duration;
int id;
int lineno;
};
static int find_edl_source(struct edl_source *sources, int num_sources,
struct bstr name)
{
for (int i = 0; i < num_sources; i++)
if (!bstrcmp(sources[i].id, name))
return i;
return -1;
}
void build_edl_timeline(struct MPContext *mpctx)
{
const struct bstr file_prefix = bstr0("<");
void *tmpmem = talloc_new(NULL);
struct bstr *lines = bstr_splitlines(tmpmem, mpctx->demuxer->file_contents);
int linec = MP_TALLOC_ELEMS(lines);
struct bstr header = bstr0("mplayer EDL file, version ");
if (!linec || !bstr_startswith(lines[0], header)) {
mp_msg(MSGT_CPLAYER, MSGL_ERR, "EDL: Bad EDL header!\n");
goto out;
}
struct bstr version = bstr_strip(bstr_cut(lines[0], header.len));
if (bstrcmp(bstr0("2"), version)) {
mp_msg(MSGT_CPLAYER, MSGL_ERR, "EDL: Unsupported EDL file version!\n");
goto out;
}
int num_sources = 0;
int num_parts = 0;
for (int i = 1; i < linec; i++) {
if (bstr_startswith(lines[i], file_prefix)) {
num_sources++;
} else {
int comment = bstrchr(lines[i], '#');
if (comment >= 0)
lines[i] = bstr_splice(lines[i], 0, comment);
if (bstr_strip(lines[i]).len)
num_parts++;
}
}
if (!num_parts) {
mp_msg(MSGT_CPLAYER, MSGL_ERR, "No parts in timeline!\n");
goto out;
}
// Parse source filename definitions
struct edl_source *edl_ids = talloc_array_ptrtype(tmpmem, edl_ids,
num_sources);
num_sources = 0;
for (int i = 1; i < linec; i++) {
struct bstr line = lines[i];
if (!bstr_startswith(line, file_prefix))
continue;
line = bstr_cut(line, file_prefix.len);
struct bstr id = bstr_split(line, WHITESPACE, &line);
if (find_edl_source(edl_ids, num_sources, id) >= 0) {
mp_msg(MSGT_CPLAYER, MSGL_ERR, "EDL: Repeated ID on line %d!\n",
i+1);
goto out;
}
if (!isalpha(*id.start)) {
mp_msg(MSGT_CPLAYER, MSGL_ERR, "EDL: Invalid ID on line %d!\n",
i+1);
goto out;
}
char *filename = mp_basename(bstrdup0(tmpmem, bstr_strip(line)));
if (!strlen(filename)) {
mp_msg(MSGT_CPLAYER, MSGL_ERR,
"EDL: Invalid filename on line %d!\n", i+1);
goto out;
}
struct bstr dirname = mp_dirname(mpctx->demuxer->filename);
char *fullname = mp_path_join(tmpmem, dirname, bstr0(filename));
edl_ids[num_sources++] = (struct edl_source){id, fullname, i+1};
}
// Parse timeline part definitions
struct edl_part *parts = talloc_array_ptrtype(tmpmem, parts, num_parts);
int total_parts = num_parts;
num_parts = 0;
for (int i = 1; i < linec; i++) {
struct bstr line = bstr_strip(lines[i]);
if (!line.len || bstr_startswith(line, file_prefix))
continue;
parts[num_parts] = (struct edl_part){{-1, -1}, {-1, -1}, 0, -1};
parts[num_parts].lineno = i + 1;
for (int s = 0; s < 2; s++) {
struct edl_time *p = !s ? &parts[num_parts].tl :
&parts[num_parts].src;
while (1) {
struct bstr t = bstr_split(line, WHITESPACE, &line);
if (!t.len) {
if (!s && num_parts < total_parts - 1) {
mp_msg(MSGT_CPLAYER, MSGL_ERR, "EDL: missing source "
"identifier on line %d (not last)!\n", i+1);
goto out;
}
break;
}
if (isalpha(*t.start)) {
if (s)
goto bad;
parts[num_parts].id = find_edl_source(edl_ids, num_sources,
t);
if (parts[num_parts].id < 0) {
mp_msg(MSGT_CPLAYER, MSGL_ERR, "EDL: Undefined source "
"identifier on line %d!\n", i+1);
goto out;
}
break;
}
while (t.len) {
struct bstr next;
struct bstr arg = bstr_split(t, "+-", &next);
if (!arg.len) {
next = bstr_split(line, WHITESPACE, &line);
arg = bstr_split(next, "+-", &next);
}
if (!arg.len)
goto bad;
int64_t val;
if (!bstrcmp(arg, bstr0("*")))
val = -1;
else if (isdigit(*arg.start)) {
val = bstrtoll(arg, &arg, 10) * 1000000000;
if (arg.len && *arg.start == '.') {
int len = arg.len - 1;
arg = bstr_splice(arg, 1, 10);
int64_t val2 = bstrtoll(arg, &arg, 10);
if (arg.len)
goto bad;
for (; len < 9; len++)
val2 *= 10;
val += val2;
}
} else
goto bad;
int c = *t.start;
if (isdigit(c) || c == '*') {
if (val < 0)
p->implied_start = true;
else
p->start = val;
} else if (c == '-') {
if (val < 0)
p->implied_end = true;
else
p->end = val;
} else if (c == '+') {
if (val < 0)
goto bad;
if (val == 0) {
mp_msg(MSGT_CPLAYER, MSGL_ERR, "EDL: zero duration "
"on line %d!\n", i+1);
goto out;
}
parts[num_parts].duration = val;
} else
goto bad;
t = next;
}
}
}
num_parts++;
continue;
bad:
mp_msg(MSGT_CPLAYER, MSGL_ERR, "EDL: Malformed line %d!\n", i+1);
goto out;
}
// Fill in implied start/stop/duration values
int64_t *times = talloc_zero_array(tmpmem, int64_t, num_sources);
while (1) {
int64_t time = 0;
for (int i = 0; i < num_parts; i++) {
for (int s = 0; s < 2; s++) {
struct edl_time *p = s ? &parts[i].tl : &parts[i].src;
if (!s && parts[i].id == -1)
continue;
int64_t *t = s ? &time : times + parts[i].id;
p->implied_start |= s && *t >= 0;
if (p->implied_start && p->start >= 0 && *t >= 0
&& p->start != *t) {
mp_msg(MSGT_CPLAYER, MSGL_ERR, "EDL: Inconsistent line "
"%d!\n", parts[i].lineno);
goto out;
}
if (p->start >= 0)
*t = p->start;
if (p->implied_start)
p->start = *t;
if (*t >= 0 && parts[i].duration)
*t += parts[i].duration;
else
*t = -1;
if (p->end >= 0)
*t = p->end;
}
}
for (int i = 0; i < num_sources; i++)
times[i] = -1;
time = -1;
for (int i = num_parts - 1; i >= 0; i--) {
for (int s = 0; s < 2; s++) {
struct edl_time *p = s ? &parts[i].tl : &parts[i].src;
if (!s && parts[i].id == -1)
continue;
int64_t *t = s ? &time : times + parts[i].id;
p->implied_end |= s && *t >= 0;
if (p->implied_end && p->end >= 0 && *t >=0 && p->end != *t) {
mp_msg(MSGT_CPLAYER, MSGL_ERR, "EDL: Inconsistent line "
"%d!\n", parts[i].lineno);
goto out;
}
if (p->end >= 0)
*t = p->end;
if (p->implied_end)
p->end = *t;
if (*t >= 0 && parts[i].duration) {
*t -= parts[i].duration;
if (*t < 0) {
mp_msg(MSGT_CPLAYER, MSGL_ERR, "EDL: Negative time "
"on line %d!\n", parts[i].lineno);
goto out;
}
} else
*t = -1;
if (p->start >= 0)
*t = p->start;
}
}
int missing_duration = -1;
int missing_srcstart = -1;
bool anything_done = false;
for (int i = 0; i < num_parts; i++) {
int64_t duration = parts[i].duration;
if (parts[i].tl.start >= 0 && parts[i].tl.end >= 0) {
int64_t duration2 = parts[i].tl.end - parts[i].tl.start;
if (duration && duration != duration2)
goto incons;
duration = duration2;
if (duration <= 0)
goto neg;
}
if (parts[i].src.start >= 0 && parts[i].src.end >= 0) {
int64_t duration2 = parts[i].src.end - parts[i].src.start;
if (duration && duration != duration2) {
incons:
mp_msg(MSGT_CPLAYER, MSGL_ERR, "EDL: Inconsistent line "
"%d!\n", i+1);
goto out;
}
duration = duration2;
if (duration <= 0) {
neg:
mp_msg(MSGT_CPLAYER, MSGL_ERR, "EDL: duration <= 0 on "
"line %d!\n", parts[i].lineno);
goto out;
}
}
if (parts[i].id == -1)
continue;
if (!duration)
missing_duration = i;
else if (!parts[i].duration)
anything_done = true;
parts[i].duration = duration;
if (duration && parts[i].src.start < 0) {
if (parts[i].src.end < 0)
missing_srcstart = i;
else
parts[i].src.start = parts[i].src.end - duration;
}
}
if (!anything_done) {
if (missing_duration >= 0) {
mp_msg(MSGT_CPLAYER, MSGL_ERR, "EDL: Could not determine "
"duration for line %d!\n",
parts[missing_duration].lineno);
goto out;
}
if (missing_srcstart >= 0) {
mp_msg(MSGT_CPLAYER, MSGL_ERR, "EDL: no source start time for "
"line %d!\n", parts[missing_srcstart].lineno);
goto out;
}
break;
}
}
// Open source files
struct demuxer **sources = talloc_array_ptrtype(NULL, sources,
num_sources + 1);
talloc_free(mpctx->sources);
mpctx->sources = sources;
sources[0] = mpctx->demuxer;
mpctx->num_sources = 1;
for (int i = 0; i < num_sources; i++) {
struct stream *s = stream_open(edl_ids[i].filename, mpctx->opts);
if (!s)
goto openfail;
struct demuxer *d = demux_open(s, NULL, NULL, mpctx->opts);
if (!d) {
free_stream(s);
openfail:
mp_msg(MSGT_CPLAYER, MSGL_ERR, "EDL: Could not open source "
"file on line %d!\n", edl_ids[i].lineno);
goto out;
}
sources[mpctx->num_sources] = d;
mpctx->num_sources++;
}
// Write final timeline structure
struct timeline_part *timeline = talloc_array_ptrtype(NULL, timeline,
num_parts + 1);
int64_t starttime = 0;
for (int i = 0; i < num_parts; i++) {
timeline[i].start = starttime / 1e9;
starttime += parts[i].duration;
timeline[i].source_start = parts[i].src.start / 1e9;
timeline[i].source = sources[parts[i].id + 1];
}
if (parts[num_parts - 1].id != -1) {
timeline[num_parts].start = starttime / 1e9;
num_parts++;
}
mpctx->timeline = timeline;
mpctx->num_timeline_parts = num_parts - 1;
out:
talloc_free(tmpmem);
}
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