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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-07-02 20:55:55 +00:00
mpegtspacketizer: Offset calculation
Allows PCR<=>PTS<=>offset estimation/calculation Right now the calculation is very naive, but can be extended later on without disrupting the code in tsdemux/mpegtsbase
This commit is contained in:
Edward Hervey
parent
39cc29a7d2
commit
a4899af8d6
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@ -69,10 +69,35 @@ static GQuark QUARK_SEGMENT_LAST_SECTION_NUMBER;
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static GQuark QUARK_LAST_TABLE_ID;
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static GQuark QUARK_EVENTS;
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#define MPEGTS_PACKETIZER_GET_PRIVATE(obj) \
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(G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_TYPE_MPEGTS_PACKETIZER, MpegTSPacketizerPrivate))
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static void _init_local (void);
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G_DEFINE_TYPE_EXTENDED (MpegTSPacketizer2, mpegts_packetizer, G_TYPE_OBJECT, 0,
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_init_local ());
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typedef struct
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{
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guint64 offset; /* offset in upstream */
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guint64 pcr; /* pcr (wraparound not fixed) */
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} MpegTSPacketizerOffset;
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struct _MpegTSPacketizerPrivate
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{
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/* Used for bitrate calculation */
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/* FIXME : Replace this later on with a balanced tree or sequence */
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guint64 first_offset;
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guint64 first_pcr;
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guint64 last_offset;
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guint64 last_pcr;
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/* Reference offset */
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guint64 refoffset;
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guint nb_seen_offsets;
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};
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static void mpegts_packetizer_dispose (GObject * object);
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static void mpegts_packetizer_finalize (GObject * object);
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static gchar *convert_to_utf8 (const gchar * text, gint length, guint start,
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@ -82,6 +107,8 @@ static gchar *get_encoding (const gchar * text, guint * start_text,
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static gchar *get_encoding_and_convert (const gchar * text, guint length);
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static GstClockTime calculate_skew (MpegTSPacketizer2 * packetizer,
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guint64 pcrtime, GstClockTime time);
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static void record_pcr (MpegTSPacketizer2 * packetizer, guint64 pcr,
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guint64 offset);
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static void mpegts_packetizer_reset_skew (MpegTSPacketizer2 * packetizer);
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#define CONTINUITY_UNSET 255
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@ -156,6 +183,8 @@ mpegts_packetizer_class_init (MpegTSPacketizer2Class * klass)
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{
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GObjectClass *gobject_class;
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g_type_class_add_private (klass, sizeof (MpegTSPacketizerPrivate));
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gobject_class = G_OBJECT_CLASS (klass);
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gobject_class->dispose = mpegts_packetizer_dispose;
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@ -165,13 +194,22 @@ mpegts_packetizer_class_init (MpegTSPacketizer2Class * klass)
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static void
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mpegts_packetizer_init (MpegTSPacketizer2 * packetizer)
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{
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packetizer->priv = MPEGTS_PACKETIZER_GET_PRIVATE (packetizer);
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packetizer->adapter = gst_adapter_new ();
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packetizer->offset = 0;
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packetizer->empty = TRUE;
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packetizer->streams = g_new0 (MpegTSPacketizerStream *, 8192);
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packetizer->know_packet_size = FALSE;
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packetizer->calculate_skew = FALSE;
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packetizer->calculate_offset = FALSE;
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mpegts_packetizer_reset_skew (packetizer);
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packetizer->priv->first_offset = -1;
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packetizer->priv->first_pcr = -1;
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packetizer->priv->last_offset = -1;
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packetizer->priv->last_pcr = -1;
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packetizer->priv->nb_seen_offsets = 0;
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packetizer->priv->refoffset = -1;
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}
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static void
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@ -269,17 +307,24 @@ mpegts_packetizer_parse_adaptation_field_control (MpegTSPacketizer2 *
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/* PCR */
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if (afcflags & MPEGTS_AFC_PCR_FLAG) {
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packet->pcr = mpegts_packetizer_compute_pcr (data);
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*data += 6;
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GST_DEBUG ("pcr %" G_GUINT64_FORMAT " (%" GST_TIME_FORMAT ")",
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packet->pcr, GST_TIME_ARGS (PCRTIME_TO_GSTTIME (packet->pcr)));
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if (packetizer->calculate_skew)
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GST_BUFFER_TIMESTAMP (packet->buffer) =
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calculate_skew (packetizer, packet->pcr,
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GST_BUFFER_TIMESTAMP (packet->buffer));
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*data += 6;
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if (packetizer->calculate_offset)
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record_pcr (packetizer, packet->pcr, packet->offset);
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}
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/* OPCR */
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if (afcflags & MPEGTS_AFC_OPCR_FLAG) {
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packet->opcr = mpegts_packetizer_compute_pcr (data);
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*data += 6;
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/* *data += 6; */
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GST_DEBUG ("opcr %" G_GUINT64_FORMAT " (%" GST_TIME_FORMAT ")",
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packet->pcr, GST_TIME_ARGS (PCRTIME_TO_GSTTIME (packet->pcr)));
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}
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return TRUE;
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@ -2782,6 +2827,7 @@ failed:
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static void
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mpegts_packetizer_reset_skew (MpegTSPacketizer2 * packetizer)
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{
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/* FIXME : These variables should be *per* PCR PID */
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packetizer->base_time = GST_CLOCK_TIME_NONE;
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packetizer->base_pcrtime = GST_CLOCK_TIME_NONE;
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packetizer->last_pcrtime = GST_CLOCK_TIME_NONE;
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@ -2798,6 +2844,7 @@ static void
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mpegts_packetizer_resync (MpegTSPacketizer2 * packetizer, GstClockTime time,
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GstClockTime gstpcrtime, gboolean reset_skew)
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{
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/* FIXME : These variables should be *per* PCR PID */
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packetizer->base_time = time;
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packetizer->base_pcrtime = gstpcrtime;
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packetizer->prev_out_time = GST_CLOCK_TIME_NONE;
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@ -3082,3 +3129,109 @@ no_skew:
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return out_time;
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}
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static void
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record_pcr (MpegTSPacketizer2 * packetizer, guint64 pcr, guint64 offset)
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{
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MpegTSPacketizerPrivate *priv = packetizer->priv;
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/* Check against first PCR */
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if (priv->first_pcr == -1 || priv->first_offset > offset) {
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GST_DEBUG ("Recording first value. PCR:%" G_GUINT64_FORMAT " offset:%"
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G_GUINT64_FORMAT, pcr, offset);
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priv->first_pcr = pcr;
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priv->first_offset = offset;
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priv->nb_seen_offsets++;
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} else
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/* If we didn't update the first PCR, let's check against last PCR */
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if (priv->last_pcr == -1 || priv->last_offset < offset) {
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GST_DEBUG ("Recording last value. PCR:%" G_GUINT64_FORMAT " offset:%"
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G_GUINT64_FORMAT, pcr, offset);
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priv->last_pcr = pcr;
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priv->last_offset = offset;
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priv->nb_seen_offsets++;
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}
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}
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guint
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mpegts_packetizer_get_seen_pcr (MpegTSPacketizer2 * packetizer)
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{
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return packetizer->priv->nb_seen_offsets;
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}
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GstClockTime
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mpegts_packetizer_offset_to_ts (MpegTSPacketizer2 * packetizer, guint64 offset)
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{
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MpegTSPacketizerPrivate *priv = packetizer->priv;
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GstClockTime res;
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if (G_UNLIKELY (!packetizer->calculate_offset))
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return GST_CLOCK_TIME_NONE;
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if (G_UNLIKELY (priv->refoffset == -1))
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return GST_CLOCK_TIME_NONE;
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if (G_UNLIKELY (offset < priv->refoffset))
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return GST_CLOCK_TIME_NONE;
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/* Convert byte difference into time difference */
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res = PCRTIME_TO_GSTTIME (gst_util_uint64_scale (offset - priv->refoffset,
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priv->last_pcr - priv->first_pcr,
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priv->last_offset - priv->first_offset));
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GST_DEBUG ("Returning timestamp %" GST_TIME_FORMAT " for offset %"
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G_GUINT64_FORMAT, GST_TIME_ARGS (res), offset);
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return res;
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}
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GstClockTime
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mpegts_packetizer_pts_to_ts (MpegTSPacketizer2 * packetizer, guint64 pts)
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{
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/* Use clock skew if present */
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if (packetizer->calculate_skew
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&& GST_CLOCK_TIME_IS_VALID (packetizer->base_time)) {
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GST_DEBUG ("pts %" G_GUINT64_FORMAT " base_pcrtime:%" G_GUINT64_FORMAT
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" base_time:%" GST_TIME_FORMAT, pts, packetizer->base_pcrtime,
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GST_TIME_ARGS (packetizer->base_time));
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return pts - packetizer->base_pcrtime + packetizer->base_time +
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packetizer->skew;
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}
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/* If not, use pcr observations */
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if (packetizer->calculate_offset && packetizer->priv->first_pcr != -1)
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return pts - PCRTIME_TO_GSTTIME (packetizer->priv->first_pcr);
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return GST_CLOCK_TIME_NONE;
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}
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guint64
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mpegts_packetizer_ts_to_offset (MpegTSPacketizer2 * packetizer, GstClockTime ts)
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{
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MpegTSPacketizerPrivate *priv = packetizer->priv;
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guint64 res;
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if (!packetizer->calculate_offset || packetizer->priv->first_pcr == -1)
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return -1;
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GST_DEBUG ("ts(pcr) %" G_GUINT64_FORMAT " first_pcr:%" G_GUINT64_FORMAT,
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GSTTIME_TO_MPEGTIME (ts), priv->first_pcr);
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/* Convert ts to PCRTIME */
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res = gst_util_uint64_scale (GSTTIME_TO_PCRTIME (ts),
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priv->last_offset - priv->first_offset, priv->last_pcr - priv->first_pcr);
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res += priv->first_offset + priv->refoffset;
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GST_DEBUG ("Returning offset %" G_GUINT64_FORMAT " for ts %" GST_TIME_FORMAT,
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res, GST_TIME_ARGS (ts));
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return res;
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}
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void
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mpegts_packetizer_set_reference_offset (MpegTSPacketizer2 * packetizer,
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guint64 refoffset)
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{
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GST_DEBUG ("Setting reference offset to %" G_GUINT64_FORMAT, refoffset);
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packetizer->priv->refoffset = refoffset;
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}
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@ -58,6 +58,7 @@ G_BEGIN_DECLS
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typedef struct _MpegTSPacketizer2 MpegTSPacketizer2;
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typedef struct _MpegTSPacketizer2Class MpegTSPacketizer2Class;
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typedef struct _MpegTSPacketizerPrivate MpegTSPacketizerPrivate;
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typedef struct
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{
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@ -74,6 +75,7 @@ struct _MpegTSPacketizer2 {
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GstAdapter *adapter;
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/* streams hashed by pid */
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/* FIXME : be more memory efficient (see how it's done in mpegtsbase) */
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MpegTSPacketizerStream **streams;
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gboolean disposed;
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gboolean know_packet_size;
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@ -102,6 +104,11 @@ struct _MpegTSPacketizer2 {
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gint64 window_min;
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gint64 skew;
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gint64 prev_send_diff;
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/* offset/bitrate calculator */
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gboolean calculate_offset;
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MpegTSPacketizerPrivate *priv;
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};
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struct _MpegTSPacketizer2Class {
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@ -187,8 +194,22 @@ GstStructure *mpegts_packetizer_parse_eit (MpegTSPacketizer2 *packetizer,
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MpegTSPacketizerSection *section);
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GstStructure *mpegts_packetizer_parse_tdt (MpegTSPacketizer2 *packetizer,
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MpegTSPacketizerSection *section);
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guint64 mpegts_packetizer_compute_pcr(const guint8 * data);
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/* Only valid if calculate_offset is TRUE */
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guint mpegts_packetizer_get_seen_pcr (MpegTSPacketizer2 *packetizer);
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GstClockTime
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mpegts_packetizer_offset_to_ts (MpegTSPacketizer2 * packetizer,
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guint64 offset);
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guint64
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mpegts_packetizer_ts_to_offset (MpegTSPacketizer2 * packetizer,
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GstClockTime ts);
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GstClockTime
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mpegts_packetizer_pts_to_ts (MpegTSPacketizer2 * packetizer,
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guint64 pcr);
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void
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mpegts_packetizer_set_reference_offset (MpegTSPacketizer2 * packetizer,
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guint64 refoffset);
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G_END_DECLS
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#endif /* GST_MPEGTS_PACKETIZER_H */
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