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mov: Implement parsing of the "HandlerName" from the MP4 HDLR atom

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This atom typically is used for a track title. The handler name is stored
as a Pascal string in the QT specs (first byte is the length of the string),
so do not export it.

A second length check based on the first character is added to avoid
overwriting an already specified handler_name (it happens with YouTube
videos for instance, the handler_name get masked), or specifying an
empty string metadata.

The Pascal string fix and the second length check are written
by Clément Bœsch <clement.boesch@smartjog.com>.

Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
This commit is contained in:
Hendrik Leppkes 2015-02-03 14:58:50 +00:00 committed by Vittorio Giovara
parent 27b99d929f
commit e3528d2a7b
1 changed files with 16 additions and 0 deletions
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16
libavformat/mov.c
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@ -558,6 +558,8 @@ static int mov_read_hdlr(MOVContext *c, AVIOContext *pb, MOVAtom atom)
AVStream *st;
uint32_t type;
uint32_t av_unused ctype;
int64_t title_size;
char *title_str;
if (c->fc->nb_streams < 1) // meta before first trak
return 0;
@ -587,6 +589,20 @@ static int mov_read_hdlr(MOVContext *c, AVIOContext *pb, MOVAtom atom)
avio_rb32(pb); /* component flags */
avio_rb32(pb); /* component flags mask */
title_size = atom.size - 24;
if (title_size > 0) {
title_str = av_malloc(title_size + 1); /* Add null terminator */
if (!title_str)
return AVERROR(ENOMEM);
avio_read(pb, title_str, title_size);
title_str[title_size] = 0;
if (title_str[0]) {
int off = (!c->isom && title_str[0] == title_size - 1);
av_dict_set(&st->metadata, "handler_name", title_str + off, 0);
}
av_freep(&title_str);
}
return 0;
}