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tsdemux: Detect language from ac3 descriptor

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Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/4709>
This commit is contained in:
Vivia Nikolaidou 2023-05-25 13:02:09 +03:00 committed by GStreamer Marge Bot
parent bdff780fe9
commit 0a331402d6
2 changed files with 19 additions and 0 deletions
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4
subprojects/gst-plugins-bad/gst/mpegtsdemux/gstmpegdesc.h
View file

@ -211,6 +211,10 @@
/* AC3_audio_stream_descriptor */
#define DESC_AC_AUDIO_STREAM_bsid(desc) ((desc)[2] & 0x1f)
#define DESC_AC_AUDIO_STREAM_channels(desc) ((desc[4] >> 1) & 0x0f)
#define DESC_AC_AUDIO_STREAM_textlen(desc) ((desc[7 + (DESC_AC_AUDIO_STREAM_channels(desc)==0)] >> 1) & 0x7f)
#define DESC_AC_AUDIO_STREAM_has_lang1(desc) ((desc[8 + DESC_AC_AUDIO_STREAM_textlen(desc)] >> 7) & 0x01)
#define DESC_AC_AUDIO_STREAM_lang1_code(desc) (desc + 9 + DESC_AC_AUDIO_STREAM_textlen(desc))
/* FIXME : Move list of well know registration ids to an enum
* in the mpegts library.

15
subprojects/gst-plugins-bad/gst/mpegtsdemux/tsdemux.c
View file

@ -1269,6 +1269,21 @@ gst_ts_demux_create_tags (TSDemuxStream * stream)
const GstMpegtsDescriptor *desc = NULL;
int i, nb;
if (bstream->stream_type == ST_PS_AUDIO_AC3 &&
!mpegts_get_descriptor_from_stream (bstream,
GST_MTS_DESC_DVB_ENHANCED_AC3)) {
const GstMpegtsDescriptor *ac3_desc =
mpegts_get_descriptor_from_stream (bstream,
GST_MTS_DESC_AC3_AUDIO_STREAM);
if (ac3_desc && DESC_AC_AUDIO_STREAM_has_lang1 (ac3_desc->data)) {
gchar lang_code[4];
memcpy (lang_code, DESC_AC_AUDIO_STREAM_lang1_code (ac3_desc->data), 3);
lang_code[3] = '\0';
add_iso639_language_to_tags (stream, lang_code);
}
}
desc =
mpegts_get_descriptor_from_stream (bstream,
GST_MTS_DESC_ISO_639_LANGUAGE);