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avformat/mpegts: DVB subtitles multiple languages support

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Copy multiple languages data from PMT to extradata. New 5 bytes
per language extradata format.

Reviewed-by: Marton Balint <cus@passwd.hu>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
mrlika 2014-02-03 14:11:07 +02:00 committed by Michael Niedermayer
parent c107769c68
commit e2707a7cf7
2 changed files with 62 additions and 24 deletions
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84
libavformat/mpegts.c
View File

@ -1512,31 +1512,69 @@ int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type
}
break;
case 0x59: /* subtitling descriptor */
language[0] = get8(pp, desc_end);
language[1] = get8(pp, desc_end);
language[2] = get8(pp, desc_end);
language[3] = 0;
/* hearing impaired subtitles detection */
switch(get8(pp, desc_end)) {
case 0x20: /* DVB subtitles (for the hard of hearing) with no monitor aspect ratio criticality */
case 0x21: /* DVB subtitles (for the hard of hearing) for display on 4:3 aspect ratio monitor */
case 0x22: /* DVB subtitles (for the hard of hearing) for display on 16:9 aspect ratio monitor */
case 0x23: /* DVB subtitles (for the hard of hearing) for display on 2.21:1 aspect ratio monitor */
case 0x24: /* DVB subtitles (for the hard of hearing) for display on a high definition monitor */
case 0x25: /* DVB subtitles (for the hard of hearing) with plano-stereoscopic disparity for display on a high definition monitor */
st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
break;
}
if (st->codec->extradata) {
if (st->codec->extradata_size == 4 && memcmp(st->codec->extradata, *pp, 4))
avpriv_request_sample(fc, "DVB sub with multiple IDs");
} else {
if (!ff_alloc_extradata(st->codec, 4)) {
memcpy(st->codec->extradata, *pp, 4);
{
/* 8 bytes per DVB subtitle substream data:
* ISO_639_language_code (3 bytes),
* subtitling_type (1 byte),
* composition_page_id (2 bytes),
* ancillary_page_id (2 bytes) */
int language_count = desc_len / 8;
if (desc_len > 0 && desc_len % 8 != 0)
return AVERROR_INVALIDDATA;
if (language_count > 1) {
avpriv_request_sample(fc, "DVB subtitles with multiple languages");
}
if (language_count > 0) {
uint8_t *extradata;
/* 4 bytes per language code (3 bytes) with comma or NUL byte should fit language buffer */
if (language_count > sizeof(language) / 4) {
language_count = sizeof(language) / 4;
}
if (st->codec->extradata == NULL) {
if (ff_alloc_extradata(st->codec, language_count * 5)) {
return AVERROR(ENOMEM);
}
}
if (st->codec->extradata_size < language_count * 5)
return AVERROR_INVALIDDATA;
extradata = st->codec->extradata;
for (i = 0; i < language_count; i++) {
language[i * 4 + 0] = get8(pp, desc_end);
language[i * 4 + 1] = get8(pp, desc_end);
language[i * 4 + 2] = get8(pp, desc_end);
language[i * 4 + 3] = ',';
/* hearing impaired subtitles detection using subtitling_type */
switch(*pp[0]) {
case 0x20: /* DVB subtitles (for the hard of hearing) with no monitor aspect ratio criticality */
case 0x21: /* DVB subtitles (for the hard of hearing) for display on 4:3 aspect ratio monitor */
case 0x22: /* DVB subtitles (for the hard of hearing) for display on 16:9 aspect ratio monitor */
case 0x23: /* DVB subtitles (for the hard of hearing) for display on 2.21:1 aspect ratio monitor */
case 0x24: /* DVB subtitles (for the hard of hearing) for display on a high definition monitor */
case 0x25: /* DVB subtitles (for the hard of hearing) with plano-stereoscopic disparity for display on a high definition monitor */
st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
break;
}
extradata[4] = get8(pp, desc_end); /* subtitling_type */
memcpy(extradata, *pp, 4); /* composition_page_id and ancillary_page_id */
extradata += 5;
*pp += 4;
}
language[i * 4 - 1] = 0;
av_dict_set(&st->metadata, "language", language, 0);
}
}
*pp += 4;
av_dict_set(&st->metadata, "language", language, 0);
break;
case 0x0a: /* ISO 639 language descriptor */
for (i = 0; i + 4 <= desc_len; i += 4) {

2
libavformat/version.h
View File

@ -31,7 +31,7 @@
#define LIBAVFORMAT_VERSION_MAJOR 55
#define LIBAVFORMAT_VERSION_MINOR 32
#define LIBAVFORMAT_VERSION_MICRO 100
#define LIBAVFORMAT_VERSION_MICRO 101
#define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
LIBAVFORMAT_VERSION_MINOR, \