From: Limin Wang <[email protected]>
Signed-off-by: Limin Wang <[email protected]>
---
libavformat/mpegts.c | 42 ++++++++++++++++++++++++++++++++++++++++++
1 file changed, 42 insertions(+)
diff --git a/libavformat/mpegts.c b/libavformat/mpegts.c
index 1ed7eaf..d450507 100644
--- a/libavformat/mpegts.c
+++ b/libavformat/mpegts.c
@@ -1990,6 +1990,48 @@ int ff_parse_mpeg2_descriptor(AVFormatContext *fc,
AVStream *st, int stream_type
st->request_probe = 50;
}
break;
+ case 0x81: /* ATSC AC-3 descriptor */
+ {
+ uint8_t buf;
+ uint8_t sample_rate_code, bsid,bitrate_code,surround_mode, bsmod;
+ uint8_t num_channels, full_svc, mainid, priority, asvcflags;
+
+ if (desc_len < 4)
+ return AVERROR_INVALIDDATA;
+
+ buf = get8(pp, desc_end);
+ sample_rate_code = (buf >> 5 ) & 0x07;
+ bsid = buf & 0x1F;
+ av_dict_set_int(&st->metadata, "atsc.ac3_desc.sample_rate_code",
sample_rate_code, 0);
+ av_dict_set_int(&st->metadata, "atsc.ac3_desc.bsid", bsid, 0);
+
+ buf = get8(pp, desc_end);
+ bitrate_code = (buf >> 2 ) & 0x1F;
+ surround_mode = buf & 0x03;
+ av_dict_set_int(&st->metadata, "atsc.ac3_desc.bitrate_code",
bitrate_code, 0);
+ av_dict_set_int(&st->metadata, "atsc.ac3_desc.surround_mode",
surround_mode, 0);
+
+ buf = get8(pp, desc_end);
+ bsmod = (buf >> 5) & 0x07;
+ num_channels = (buf >> 1) & 0x0F;
+ full_svc = buf & 0x01;
+ av_dict_set_int(&st->metadata, "atsc.ac3_desc.bsmod", bsmod, 0);
+ av_dict_set_int(&st->metadata, "atsc.ac3_desc.num_channels",
num_channels, 0);
+ av_dict_set_int(&st->metadata, "atsc.ac3_desc.full_svc", full_svc,
0);
+
+ buf = get8(pp, desc_end);
+ if (bsmod < 2) {
+ mainid = (buf >> 5) & 0x7;
+ priority = (buf >> 3) & 0x3;
+ av_dict_set_int(&st->metadata, "atsc.ac3_desc.mainid", mainid,
0);
+ av_dict_set_int(&st->metadata, "atsc.ac3_desc.priority",
priority, 0);
+ } else {
+ asvcflags = buf;
+ av_dict_set_int(&st->metadata, "atsc.ac3_desc.asvc",
asvcflags, 0);
+ }
+ /* other field in standard will be skipped */
+ }
+ break;
case 0x52: /* stream identifier descriptor */
st->stream_identifier = 1 + get8(pp, desc_end);
break;
--
1.8.3.1
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