From: zheng qian <x...@xqq.im>
Writes a general ARIB stream identifier descriptor, as well
as a data component descriptor which also includes a
pre-defined additional_arib_caption_info structure.
Signed-off-by: zheng qian <x...@xqq.im>
---
libavformat/mpegtsenc.c | 48 +++++++++++++++++++++++++++++++++++++++++
1 file changed, 48 insertions(+)
diff --git a/libavformat/mpegtsenc.c b/libavformat/mpegtsenc.c
index 04af6da2db..98dac17994 100644
--- a/libavformat/mpegtsenc.c
+++ b/libavformat/mpegtsenc.c
@@ -287,6 +287,50 @@ static void putbuf(uint8_t **q_ptr, const uint8_t *buf,
size_t len)
*q_ptr += len;
}
+static int put_arib_caption_descriptor(AVFormatContext *s, uint8_t **q_ptr,
+ AVCodecParameters *codecpar)
+{
+ uint8_t stream_identifier;
+ uint16_t data_component_id;
+ uint8_t *q = *q_ptr;
+
+ switch (codecpar->profile) {
+ case FF_PROFILE_ARIB_PROFILE_A:
+ stream_identifier = 0x30;
+ data_component_id = 0x0008;
+ break;
+ case FF_PROFILE_ARIB_PROFILE_C:
+ stream_identifier = 0x87;
+ data_component_id = 0x0012;
+ break;
+ default:
+ av_log(s, AV_LOG_ERROR,
+ "Unset/unknown ARIB caption profile %d utilized!\n",
+ codecpar->profile);
+ return AVERROR_INVALIDDATA;
+ }
+
+ // stream_identifier_descriptor
+ *q++ = 0x52; // descriptor_tag
+ *q++ = 1; // descriptor_length
+ *q++ = stream_identifier; // component_tag: stream_identifier
+
+ // data_component_descriptor, defined in ARIB STD-B10, part 2, 6.2.20
+ *q++ = 0xFD; // descriptor_tag: ARIB data coding type descriptor
+ *q++ = 3; // descriptor_length
+ put16(&q, data_component_id); // data_component_id
+ // additional_arib_caption_info: defined in ARIB STD-B24, fascicle 1, Part
3, 9.6.1
+ // Here we utilize a pre-defined set of values defined in ARIB TR-B14,
+ // Fascicle 2, 4.2.8.5 for PMT usage, with the reserved bits in the middle
+ // set to 1 (as that is what every broadcaster seems to be doing in
+ // production).
+ *q++ = 0x3D; // DMF('0011'), Reserved('11'), Timing('01')
+
+ *q_ptr = q;
+
+ return 0;
+}
+
static void put_registration_descriptor(uint8_t **q_ptr, uint32_t tag)
{
uint8_t *q = *q_ptr;
@@ -369,6 +413,7 @@ static int get_dvb_stream_type(AVFormatContext *s, AVStream
*st)
break;
case AV_CODEC_ID_DVB_SUBTITLE:
case AV_CODEC_ID_DVB_TELETEXT:
+ case AV_CODEC_ID_ARIB_CAPTION:
stream_type = STREAM_TYPE_PRIVATE_DATA;
break;
case AV_CODEC_ID_SMPTE_KLV:
@@ -726,6 +771,9 @@ static int mpegts_write_pmt(AVFormatContext *s,
MpegTSService *service)
}
*len_ptr = q - len_ptr - 1;
+ } else if (codec_id == AV_CODEC_ID_ARIB_CAPTION) {
+ if (put_arib_caption_descriptor(s, &q, st->codecpar) < 0)
+ break;
}
break;
case AVMEDIA_TYPE_VIDEO:
--
2.31.1
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