> > But I'd like to see data decoder in the future to use more easily
> > EPG/NIT/BAT etc tables.
> > Will it be possible? With modifications if it needs to be?
>
> I don't see how, as it does not fit into the concept of the libav*
> libraries. I feel this belongs to a separate library.
A new libavdata library for data handling ?
> In case of a scrambled EIT (which I have never seen myself in the wild) you'd
> print this at every packet. You should either remove the warning, or check if
> this is the first time (e.g. by checking if the EPG stream was just created).
> You should remove this, there are tons of captures where EIT PID is
> intentionally filtered, we should not spam the user.
I made both of this log print on AV_LOG_TRACE level, I rather keep
them here if i need them.
> Not needed, as context is zero initialized.
I deleted the unnecessary init.
Anthony Delannoy
From 4fe946f525a9409321ea2bc4f78a74857b9ee2b0 Mon Sep 17 00:00:00 2001
From: Anthony Delannoy <anthony.2lan...@gmail.com>
Date: Fri, 26 Jul 2019 11:41:00 +0200
Subject: [PATCH 1/3] avformat/mpegts: add all pids & tids
---
libavformat/mpegts.h | 74 ++++++++++++++++++++++++++++++++++++++++----
1 file changed, 68 insertions(+), 6 deletions(-)
diff --git a/libavformat/mpegts.h b/libavformat/mpegts.h
index 272e2be4f7..560c319ef1 100644
--- a/libavformat/mpegts.h
+++ b/libavformat/mpegts.h
@@ -30,17 +30,79 @@
#define TS_MAX_PACKET_SIZE 204
#define NB_PID_MAX 8192
+#define USUAL_SECTION_SIZE 1024 /* except EIT which is limited to 4096 */
#define MAX_SECTION_SIZE 4096
/* pids */
-#define PAT_PID 0x0000
-#define SDT_PID 0x0011
+#define PAT_PID 0x0000 /* Program Association Table */
+#define CAT_PID 0x0001 /* Conditional Access Table */
+#define TSDT_PID 0x0002 /* Transport Stream Description Table */
+#define IPMP_PID 0x0003
+/* PID from 0x0004 to 0x000F are reserved */
+#define NIT_PID 0x0010 /* Network Information Table */
+#define SDT_PID 0x0011 /* Service Description Table */
+#define BAT_PID SDT_PID /* Bouquet Association Table */
+#define EIT_PID 0x0012 /* Event Information Table */
+#define RST_PID 0x0013 /* Running Status Table */
+#define TDT_PID 0x0014 /* Time and Date Table */
+#define TOT_PID TDT_PID
+#define NET_SYNC_PID 0x0015
+#define RNT_PID 0x0016 /* RAR Notification Table */
+/* PID from 0x0017 to 0x001B are reserved for future use */
+/* PID value 0x001C allocated to link-local inband signalling shall not be
+ * used on any broadcast signals. It shall only be used between devices in a
+ * controlled environment. */
+#define LINK_LOCAL_PID 0x001C
+#define MEASUREMENT_PID 0x001D
+#define DIT_PID 0x001E /* Discontinuity Information Table */
+#define SIT_PID 0x001F /* Selection Information Table */
+/* PID from 0x0020 to 0x1FFA may be assigned as needed to PMT, elementary
+ * streams and other data tables */
+/* PID 0x1FFB is used by DigiCipher 2/ATSC MGT metadata */
+/* PID from 0x1FFC to 0x1FFE may be assigned as needed to PMT, elementary
+ * streams and other data tables */
+#define NULL_PID 0x1FFF /* Null packet (used for fixed bandwidth padding) */
/* table ids */
-#define PAT_TID 0x00
-#define PMT_TID 0x02
-#define M4OD_TID 0x05
-#define SDT_TID 0x42
+#define PAT_TID 0x00 /* Program Association section */
+#define CAT_TID 0x01 /* Conditional Access section */
+#define PMT_TID 0x02 /* Program Map section */
+#define TSDT_TID 0x03 /* Transport Stream Description section */
+/* TID from 0x04 to 0x3F are reserved */
+#define M4OD_TID 0x05
+#define NIT_TID 0x40 /* Network Information section - actual network */
+#define ONIT_TID 0x41 /* Network Information section - other network */
+#define SDT_TID 0x42 /* Service Description section - actual TS */
+/* TID from 0x43 to 0x45 are reserved for future use */
+#define OSDT_TID 0x46 /* Service Descrition section - other TS */
+/* TID from 0x47 to 0x49 are reserved for future use */
+#define BAT_TID 0x4A /* Bouquet Association section */
+#define UNT_TID 0x4B /* Update Notification Table section */
+#define DFI_TID 0x4C /* Downloadable Font Info section */
+/* TID 0x4D is reserved for future use */
+#define EIT_TID 0x4E /* Event Information section - actual TS */
+#define OEIT_TID 0x4F /* Event Information section - other TS */
+#define EITS_START_TID 0x50 /* Event Information section schedule - actual TS */
+#define EITS_END_TID 0x5F /* Event Information section schedule - actual TS */
+#define OEITS_START_TID 0x60 /* Event Information section schedule - other TS */
+#define OEITS_END_TID 0x6F /* Event Information section schedule - other TS */
+#define TDT_TID 0x70 /* Time Date section */
+#define RST_TID 0x71 /* Running Status section */
+#define ST_TID 0x72 /* Stuffing section */
+#define TOT_TID 0x73 /* Time Offset section */
+#define AIT_TID 0x74 /* Application Inforamtion section */
+#define CT_TID 0x75 /* Container section */
+#define RCT_TID 0x76 /* Related Content section */
+#define CIT_TID 0x77 /* Content Identifier section */
+#define MPE_FEC_TID 0x78 /* MPE-FEC section */
+#define RPNT_TID 0x79 /* Resolution Provider Notification section */
+#define MPE_IFEC_TID 0x7A /* MPE-IFEC section */
+#define PROTMT_TID 0x7B /* Protection Message section */
+/* TID from 0x7C to 0x7D are reserved for future use */
+#define DIT_TID 0x7E /* Discontinuity Information section */
+#define SIT_TID 0x7F /* Selection Information section */
+/* TID from 0x80 to 0xFE are user defined */
+/* TID 0xFF is reserved */
#define STREAM_TYPE_VIDEO_MPEG1 0x01
#define STREAM_TYPE_VIDEO_MPEG2 0x02
--
2.23.0
From 6822a231d2c742ef7cb97c794b4c5541c89adae0 Mon Sep 17 00:00:00 2001
From: Anthony Delannoy <anthony.2lan...@gmail.com>
Date: Wed, 21 Aug 2019 11:36:15 +0200
Subject: [PATCH 2/3] lavc: add EPG codec ID
---
libavcodec/avcodec.h | 1 +
libavcodec/codec_desc.c | 6 ++++++
2 files changed, 7 insertions(+)
diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index de4feb6a65..1dfff67a35 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -689,6 +689,7 @@ enum AVCodecID {
AV_CODEC_ID_TTF = 0x18000,
AV_CODEC_ID_SCTE_35, ///< Contain timestamp estimated through PCR of program stream.
+ AV_CODEC_ID_EPG,
AV_CODEC_ID_BINTEXT = 0x18800,
AV_CODEC_ID_XBIN,
AV_CODEC_ID_IDF,
diff --git a/libavcodec/codec_desc.c b/libavcodec/codec_desc.c
index e6373be504..5dc8b16b8f 100644
--- a/libavcodec/codec_desc.c
+++ b/libavcodec/codec_desc.c
@@ -3191,6 +3191,12 @@ static const AVCodecDescriptor codec_descriptors[] = {
.name = "scte_35",
.long_name = NULL_IF_CONFIG_SMALL("SCTE 35 Message Queue"),
},
+ {
+ .id = AV_CODEC_ID_EPG,
+ .type = AVMEDIA_TYPE_DATA,
+ .name = "epg",
+ .long_name = NULL_IF_CONFIG_SMALL("Electronic Program Guide"),
+ },
{
.id = AV_CODEC_ID_BINTEXT,
.type = AVMEDIA_TYPE_VIDEO,
--
2.23.0
From 506706294edd6359c2ef6402a77065447396d9ce Mon Sep 17 00:00:00 2001
From: Anthony Delannoy <anthony.2lan...@gmail.com>
Date: Wed, 21 Aug 2019 11:46:56 +0200
Subject: [PATCH 3/3] lavf/mpegts: EPG extraction from mpegts
---
libavformat/mpegts.c | 70 ++++++++++++++++++++++++++++++++++++++++++--
1 file changed, 68 insertions(+), 2 deletions(-)
diff --git a/libavformat/mpegts.c b/libavformat/mpegts.c
index 0415ceea02..312e10fc37 100644
--- a/libavformat/mpegts.c
+++ b/libavformat/mpegts.c
@@ -168,6 +168,8 @@ struct MpegTSContext {
/** filters for various streams specified by PMT + for the PAT and PMT */
MpegTSFilter *pids[NB_PID_MAX];
int current_pid;
+
+ AVStream *epg_stream;
};
#define MPEGTS_OPTIONS \
@@ -2498,13 +2500,68 @@ static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len
}
}
+static void eit_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
+{
+ MpegTSContext *ts = filter->u.section_filter.opaque;
+ const uint8_t *p, *p_end;
+ SectionHeader h1, *h = &h1;
+
+ /*
+ * Sometimes we receive EPG packets but SDT table do not have
+ * eit_pres_following or eit_sched turned on, so we open EPG
+ * stream directly here.
+ */
+ if (!ts->epg_stream) {
+ ts->epg_stream = avformat_new_stream(ts->stream, NULL);
+ if (!ts->epg_stream)
+ return;
+ ts->epg_stream->id = EIT_PID;
+ ts->epg_stream->codecpar->codec_type = AVMEDIA_TYPE_DATA;
+ ts->epg_stream->codecpar->codec_id = AV_CODEC_ID_EPG;
+ }
+
+ if (ts->epg_stream->discard == AVDISCARD_ALL)
+ return;
+
+ p_end = section + section_len - 4;
+ p = section;
+
+ if (parse_section_header(h, &p, p_end) < 0)
+ return;
+ if (h->tid < EIT_TID || h->tid > OEITS_END_TID)
+ return;
+
+ av_log(ts->stream, AV_LOG_TRACE, "EIT: tid received = %.02x\n", h->tid);
+
+ /**
+ * Service_id 0xFFFF is reserved, it indicates that the current EIT table
+ * is scrambled.
+ */
+ if (h->id == 0xFFFF) {
+ av_log(ts->stream, AV_LOG_TRACE, "Scrambled EIT table received.\n");
+ return;
+ }
+
+ /**
+ * In case we receive an EPG packet before mpegts context is fully
+ * initialized.
+ */
+ if (!ts->pkt)
+ return;
+
+ new_data_packet(section, section_len, ts->pkt);
+ ts->pkt->stream_index = ts->epg_stream->index;
+ ts->stop_parse = 1;
+}
+
static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
{
MpegTSContext *ts = filter->u.section_filter.opaque;
MpegTSSectionFilter *tssf = &filter->u.section_filter;
SectionHeader h1, *h = &h1;
const uint8_t *p, *p_end, *desc_list_end, *desc_end;
- int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
+ int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type,
+ eit_sched, eit_pres_following;
char *name, *provider_name;
av_log(ts->stream, AV_LOG_TRACE, "SDT:\n");
@@ -2534,6 +2591,13 @@ static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len
val = get8(&p, p_end);
if (val < 0)
break;
+ eit_sched = (val >> 1) & 0x1;
+ eit_pres_following = val & 0x1;
+
+ if ((eit_sched | eit_pres_following) && !ts->epg_stream)
+ av_log(ts->stream, AV_LOG_TRACE, "SDT table advertise EIT but no"
+ " packets were received yet.\n");
+
desc_list_len = get16(&p, p_end);
if (desc_list_len < 0)
break;
@@ -2984,8 +3048,8 @@ static int mpegts_read_header(AVFormatContext *s)
seek_back(s, pb, pos);
mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
-
mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
+ mpegts_open_section_filter(ts, EIT_PID, eit_cb, ts, 1);
handle_packets(ts, probesize / ts->raw_packet_size);
/* if could not find service, enable auto_guess */
@@ -3240,8 +3304,10 @@ MpegTSContext *avpriv_mpegts_parse_open(AVFormatContext *s)
ts->raw_packet_size = TS_PACKET_SIZE;
ts->stream = s;
ts->auto_guess = 1;
+
mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
+ mpegts_open_section_filter(ts, EIT_PID, eit_cb, ts, 1);
return ts;
}
--
2.23.0
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