mirror of https://github.com/mpv-player/mpv
393 lines
14 KiB
C
393 lines
14 KiB
C
/*
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* This file is part of MPlayer.
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*
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* MPlayer is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* MPlayer is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with MPlayer; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <stdlib.h>
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#include <stdbool.h>
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#include <inttypes.h>
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#include <ctype.h>
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#include "talloc.h"
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#include "mpvcore/mp_core.h"
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#include "mpvcore/mp_msg.h"
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#include "demux/demux.h"
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#include "mpvcore/path.h"
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#include "mpvcore/bstr.h"
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#include "mpvcore/mp_common.h"
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#include "stream/stream.h"
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struct edl_source {
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struct bstr id;
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char *filename;
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int lineno;
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};
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struct edl_time {
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int64_t start;
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int64_t end;
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bool implied_start;
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bool implied_end;
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};
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struct edl_part {
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struct edl_time tl;
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struct edl_time src;
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int64_t duration;
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int id;
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int lineno;
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};
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static int find_edl_source(struct edl_source *sources, int num_sources,
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struct bstr name)
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{
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for (int i = 0; i < num_sources; i++)
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if (!bstrcmp(sources[i].id, name))
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return i;
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return -1;
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}
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void build_edl_timeline(struct MPContext *mpctx)
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{
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const struct bstr file_prefix = bstr0("<");
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void *tmpmem = talloc_new(NULL);
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struct bstr *lines = bstr_splitlines(tmpmem, mpctx->demuxer->file_contents);
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int linec = MP_TALLOC_ELEMS(lines);
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struct bstr header = bstr0("mplayer EDL file, version ");
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if (!linec || !bstr_startswith(lines[0], header)) {
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mp_msg(MSGT_CPLAYER, MSGL_ERR, "EDL: Bad EDL header!\n");
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goto out;
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}
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struct bstr version = bstr_strip(bstr_cut(lines[0], header.len));
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if (bstrcmp(bstr0("2"), version)) {
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mp_msg(MSGT_CPLAYER, MSGL_ERR, "EDL: Unsupported EDL file version!\n");
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goto out;
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}
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int num_sources = 0;
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int num_parts = 0;
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for (int i = 1; i < linec; i++) {
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if (bstr_startswith(lines[i], file_prefix)) {
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num_sources++;
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} else {
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int comment = bstrchr(lines[i], '#');
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if (comment >= 0)
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lines[i] = bstr_splice(lines[i], 0, comment);
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if (bstr_strip(lines[i]).len)
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num_parts++;
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}
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}
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if (!num_parts) {
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mp_msg(MSGT_CPLAYER, MSGL_ERR, "No parts in timeline!\n");
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goto out;
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}
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// Parse source filename definitions
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struct edl_source *edl_ids = talloc_array_ptrtype(tmpmem, edl_ids,
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num_sources);
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num_sources = 0;
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for (int i = 1; i < linec; i++) {
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struct bstr line = lines[i];
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if (!bstr_startswith(line, file_prefix))
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continue;
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line = bstr_cut(line, file_prefix.len);
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struct bstr id = bstr_split(line, WHITESPACE, &line);
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if (find_edl_source(edl_ids, num_sources, id) >= 0) {
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mp_msg(MSGT_CPLAYER, MSGL_ERR, "EDL: Repeated ID on line %d!\n",
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i+1);
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goto out;
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}
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if (!isalpha(*id.start)) {
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mp_msg(MSGT_CPLAYER, MSGL_ERR, "EDL: Invalid ID on line %d!\n",
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i+1);
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goto out;
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}
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char *filename = mp_basename(bstrdup0(tmpmem, bstr_strip(line)));
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if (!strlen(filename)) {
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mp_msg(MSGT_CPLAYER, MSGL_ERR,
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"EDL: Invalid filename on line %d!\n", i+1);
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goto out;
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}
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struct bstr dirname = mp_dirname(mpctx->demuxer->filename);
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char *fullname = mp_path_join(tmpmem, dirname, bstr0(filename));
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edl_ids[num_sources++] = (struct edl_source){id, fullname, i+1};
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}
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// Parse timeline part definitions
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struct edl_part *parts = talloc_array_ptrtype(tmpmem, parts, num_parts);
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int total_parts = num_parts;
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num_parts = 0;
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for (int i = 1; i < linec; i++) {
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struct bstr line = bstr_strip(lines[i]);
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if (!line.len || bstr_startswith(line, file_prefix))
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continue;
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parts[num_parts] = (struct edl_part){{-1, -1}, {-1, -1}, 0, -1};
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parts[num_parts].lineno = i + 1;
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for (int s = 0; s < 2; s++) {
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struct edl_time *p = !s ? &parts[num_parts].tl :
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&parts[num_parts].src;
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while (1) {
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struct bstr t = bstr_split(line, WHITESPACE, &line);
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if (!t.len) {
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if (!s && num_parts < total_parts - 1) {
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mp_msg(MSGT_CPLAYER, MSGL_ERR, "EDL: missing source "
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"identifier on line %d (not last)!\n", i+1);
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goto out;
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}
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break;
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}
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if (isalpha(*t.start)) {
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if (s)
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goto bad;
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parts[num_parts].id = find_edl_source(edl_ids, num_sources,
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t);
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if (parts[num_parts].id < 0) {
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mp_msg(MSGT_CPLAYER, MSGL_ERR, "EDL: Undefined source "
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"identifier on line %d!\n", i+1);
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goto out;
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}
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break;
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}
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while (t.len) {
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struct bstr next;
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struct bstr arg = bstr_split(t, "+-", &next);
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if (!arg.len) {
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next = bstr_split(line, WHITESPACE, &line);
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arg = bstr_split(next, "+-", &next);
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}
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if (!arg.len)
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goto bad;
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int64_t val;
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if (!bstrcmp(arg, bstr0("*")))
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val = -1;
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else if (isdigit(*arg.start)) {
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val = bstrtoll(arg, &arg, 10) * 1000000000;
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if (arg.len && *arg.start == '.') {
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int len = arg.len - 1;
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arg = bstr_splice(arg, 1, 10);
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int64_t val2 = bstrtoll(arg, &arg, 10);
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if (arg.len)
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goto bad;
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for (; len < 9; len++)
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val2 *= 10;
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val += val2;
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}
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} else
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goto bad;
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int c = *t.start;
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if (isdigit(c) || c == '*') {
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if (val < 0)
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p->implied_start = true;
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else
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p->start = val;
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} else if (c == '-') {
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if (val < 0)
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p->implied_end = true;
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else
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p->end = val;
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} else if (c == '+') {
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if (val < 0)
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goto bad;
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if (val == 0) {
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mp_msg(MSGT_CPLAYER, MSGL_ERR, "EDL: zero duration "
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"on line %d!\n", i+1);
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goto out;
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}
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parts[num_parts].duration = val;
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} else
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goto bad;
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t = next;
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}
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}
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}
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num_parts++;
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continue;
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bad:
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mp_msg(MSGT_CPLAYER, MSGL_ERR, "EDL: Malformed line %d!\n", i+1);
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goto out;
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}
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// Fill in implied start/stop/duration values
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int64_t *times = talloc_zero_array(tmpmem, int64_t, num_sources);
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while (1) {
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int64_t time = 0;
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for (int i = 0; i < num_parts; i++) {
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for (int s = 0; s < 2; s++) {
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struct edl_time *p = s ? &parts[i].tl : &parts[i].src;
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if (!s && parts[i].id == -1)
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continue;
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int64_t *t = s ? &time : times + parts[i].id;
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p->implied_start |= s && *t >= 0;
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if (p->implied_start && p->start >= 0 && *t >= 0
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&& p->start != *t) {
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mp_msg(MSGT_CPLAYER, MSGL_ERR, "EDL: Inconsistent line "
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"%d!\n", parts[i].lineno);
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goto out;
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}
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if (p->start >= 0)
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*t = p->start;
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if (p->implied_start)
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p->start = *t;
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if (*t >= 0 && parts[i].duration)
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*t += parts[i].duration;
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else
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*t = -1;
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if (p->end >= 0)
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*t = p->end;
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}
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}
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for (int i = 0; i < num_sources; i++)
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times[i] = -1;
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time = -1;
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for (int i = num_parts - 1; i >= 0; i--) {
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for (int s = 0; s < 2; s++) {
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struct edl_time *p = s ? &parts[i].tl : &parts[i].src;
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if (!s && parts[i].id == -1)
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continue;
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int64_t *t = s ? &time : times + parts[i].id;
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p->implied_end |= s && *t >= 0;
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if (p->implied_end && p->end >= 0 && *t >=0 && p->end != *t) {
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mp_msg(MSGT_CPLAYER, MSGL_ERR, "EDL: Inconsistent line "
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"%d!\n", parts[i].lineno);
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goto out;
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}
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if (p->end >= 0)
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*t = p->end;
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if (p->implied_end)
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p->end = *t;
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if (*t >= 0 && parts[i].duration) {
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*t -= parts[i].duration;
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if (*t < 0) {
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mp_msg(MSGT_CPLAYER, MSGL_ERR, "EDL: Negative time "
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"on line %d!\n", parts[i].lineno);
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goto out;
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}
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} else
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*t = -1;
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if (p->start >= 0)
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*t = p->start;
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}
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}
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int missing_duration = -1;
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int missing_srcstart = -1;
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bool anything_done = false;
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for (int i = 0; i < num_parts; i++) {
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int64_t duration = parts[i].duration;
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if (parts[i].tl.start >= 0 && parts[i].tl.end >= 0) {
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int64_t duration2 = parts[i].tl.end - parts[i].tl.start;
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if (duration && duration != duration2)
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goto incons;
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duration = duration2;
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if (duration <= 0)
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goto neg;
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}
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if (parts[i].src.start >= 0 && parts[i].src.end >= 0) {
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int64_t duration2 = parts[i].src.end - parts[i].src.start;
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if (duration && duration != duration2) {
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incons:
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mp_msg(MSGT_CPLAYER, MSGL_ERR, "EDL: Inconsistent line "
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"%d!\n", i+1);
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goto out;
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}
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duration = duration2;
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if (duration <= 0) {
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neg:
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mp_msg(MSGT_CPLAYER, MSGL_ERR, "EDL: duration <= 0 on "
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"line %d!\n", parts[i].lineno);
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goto out;
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}
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}
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if (parts[i].id == -1)
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continue;
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if (!duration)
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missing_duration = i;
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else if (!parts[i].duration)
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anything_done = true;
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parts[i].duration = duration;
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if (duration && parts[i].src.start < 0) {
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if (parts[i].src.end < 0)
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missing_srcstart = i;
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else
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parts[i].src.start = parts[i].src.end - duration;
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}
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}
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if (!anything_done) {
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if (missing_duration >= 0) {
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mp_msg(MSGT_CPLAYER, MSGL_ERR, "EDL: Could not determine "
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"duration for line %d!\n",
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parts[missing_duration].lineno);
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goto out;
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}
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if (missing_srcstart >= 0) {
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mp_msg(MSGT_CPLAYER, MSGL_ERR, "EDL: no source start time for "
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"line %d!\n", parts[missing_srcstart].lineno);
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goto out;
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}
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break;
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}
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}
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// Open source files
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struct demuxer **sources = talloc_array_ptrtype(NULL, sources,
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num_sources + 1);
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mpctx->sources = sources;
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sources[0] = mpctx->demuxer;
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mpctx->num_sources = 1;
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for (int i = 0; i < num_sources; i++) {
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struct stream *s = stream_open(edl_ids[i].filename, mpctx->opts);
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if (!s)
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goto openfail;
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struct demuxer *d = demux_open(s, NULL, NULL, mpctx->opts);
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if (!d) {
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free_stream(s);
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openfail:
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mp_msg(MSGT_CPLAYER, MSGL_ERR, "EDL: Could not open source "
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"file on line %d!\n", edl_ids[i].lineno);
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goto out;
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}
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sources[mpctx->num_sources] = d;
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mpctx->num_sources++;
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}
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// Write final timeline structure
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struct timeline_part *timeline = talloc_array_ptrtype(NULL, timeline,
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num_parts + 1);
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int64_t starttime = 0;
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for (int i = 0; i < num_parts; i++) {
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timeline[i].start = starttime / 1e9;
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starttime += parts[i].duration;
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timeline[i].source_start = parts[i].src.start / 1e9;
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timeline[i].source = sources[parts[i].id + 1];
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}
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if (parts[num_parts - 1].id != -1) {
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timeline[num_parts].start = starttime / 1e9;
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num_parts++;
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}
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mpctx->timeline = timeline;
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mpctx->num_timeline_parts = num_parts - 1;
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out:
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talloc_free(tmpmem);
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}
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