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avformat/mov: enable identifying TTML subtitle streams as such

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The contents are full TTML XML documents. TTML writing tests'
results are updated as the streams are now properly identified
as TTML ones.

Signed-off-by: Jan Ekström <jan.ekstrom@24i.com>
This commit is contained in:
Jan Ekström 2023-04-21 16:07:08 +03:00 committed by Jan Ekström
parent 7de3fcb059
commit b300552dfb
3 changed files with 20 additions and 10 deletions
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11
libavformat/mov.c
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@ -2263,6 +2263,11 @@ static int mov_codec_id(AVStream *st, uint32_t format)
(st->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE &&
st->codecpar->codec_id == AV_CODEC_ID_NONE)) {
id = ff_codec_get_id(ff_codec_movsubtitle_tags, format);
if (id <= 0) {
id = (format == MOV_MP4_TTML_TAG || format == MOV_ISMV_TTML_TAG) ?
AV_CODEC_ID_TTML : id;
}
if (id > 0)
st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
else
@ -2457,8 +2462,10 @@ static void mov_parse_stsd_subtitle(MOVContext *c, AVIOContext *pb,
// ttxt stsd contains display flags, justification, background
// color, fonts, and default styles, so fake an atom to read it
MOVAtom fake_atom = { .size = size };
// mp4s contains a regular esds atom
if (st->codecpar->codec_tag != AV_RL32("mp4s"))
// mp4s contains a regular esds atom, dfxp ISMV TTML has no content
// in extradata unlike stpp MP4 TTML.
if (st->codecpar->codec_tag != AV_RL32("mp4s") &&
st->codecpar->codec_tag != MOV_ISMV_TTML_TAG)
mov_read_glbl(c, pb, fake_atom);
st->codecpar->width = sc->width;
st->codecpar->height = sc->height;

9
tests/ref/fate/mov-mp4-ttml-dfxp
View File

@ -1,13 +1,13 @@
2e7e01c821c111466e7a2844826b7f6d *tests/data/fate/mov-mp4-ttml-dfxp.mp4
8519 tests/data/fate/mov-mp4-ttml-dfxp.mp4
#tb 0: 1/1000
#media_type 0: data
#codec_id 0: none
#media_type 0: subtitle
#codec_id 0: ttml
0, 0, 0, 68500, 7866, 0x456c36b7
{
"packets": [
{
"codec_type": "data",
"codec_type": "subtitle",
"stream_index": 0,
"pts": 0,
"pts_time": "0.000000",
@ -26,7 +26,8 @@
"streams": [
{
"index": 0,
"codec_type": "data",
"codec_name": "ttml",
"codec_type": "subtitle",
"codec_tag_string": "dfxp",
"codec_tag": "0x70786664",
"time_base": "1/1000",

10
tests/ref/fate/mov-mp4-ttml-stpp
View File

@ -1,13 +1,14 @@
cbd2c7ff864a663b0d893deac5a0caec *tests/data/fate/mov-mp4-ttml-stpp.mp4
8547 tests/data/fate/mov-mp4-ttml-stpp.mp4
#extradata 0: 48, 0x62100c0d
#tb 0: 1/1000
#media_type 0: data
#codec_id 0: none
#media_type 0: subtitle
#codec_id 0: ttml
0, 0, 0, 68500, 7866, 0x456c36b7
{
"packets": [
{
"codec_type": "data",
"codec_type": "subtitle",
"stream_index": 0,
"pts": 0,
"pts_time": "0.000000",
@ -26,7 +27,8 @@ cbd2c7ff864a663b0d893deac5a0caec *tests/data/fate/mov-mp4-ttml-stpp.mp4
"streams": [
{
"index": 0,
"codec_type": "data",
"codec_name": "ttml",
"codec_type": "subtitle",
"codec_tag_string": "stpp",
"codec_tag": "0x70707473",
"time_base": "1/1000",