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scte-section: add support for parsing splice components

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Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/913>
This commit is contained in:
Mathieu Duponchelle 2021-04-13 23:38:16 +02:00 committed by GStreamer Marge Bot
parent 66533ea77d
commit e272fb3444
2 changed files with 151 additions and 23 deletions
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119
subprojects/gst-plugins-bad/gst-libs/gst/mpegts/gst-scte-section.c
View file

@ -43,12 +43,18 @@
static GstMpegtsSCTESpliceEvent *
_gst_mpegts_scte_splice_event_copy (GstMpegtsSCTESpliceEvent * event)
{
return g_slice_dup (GstMpegtsSCTESpliceEvent, event);
GstMpegtsSCTESpliceEvent *copy =
g_slice_dup (GstMpegtsSCTESpliceEvent, event);
copy->components = g_ptr_array_ref (event->components);
return copy;
}
static void
_gst_mpegts_scte_splice_event_free (GstMpegtsSCTESpliceEvent * event)
{
g_ptr_array_unref (event->components);
g_slice_free (GstMpegtsSCTESpliceEvent, event);
}
@ -56,6 +62,71 @@ G_DEFINE_BOXED_TYPE (GstMpegtsSCTESpliceEvent, gst_mpegts_scte_splice_event,
(GBoxedCopyFunc) _gst_mpegts_scte_splice_event_copy,
(GFreeFunc) _gst_mpegts_scte_splice_event_free);
static GstMpegtsSCTESpliceComponent *
_gst_mpegts_scte_splice_component_copy (GstMpegtsSCTESpliceComponent *
component)
{
return g_slice_dup (GstMpegtsSCTESpliceComponent, component);
}
static void
_gst_mpegts_scte_splice_component_free (GstMpegtsSCTESpliceComponent *
component)
{
g_slice_free (GstMpegtsSCTESpliceComponent, component);
}
G_DEFINE_BOXED_TYPE (GstMpegtsSCTESpliceComponent,
gst_mpegts_scte_splice_component,
(GBoxedCopyFunc) _gst_mpegts_scte_splice_component_copy,
(GFreeFunc) _gst_mpegts_scte_splice_component_free);
static GstMpegtsSCTESpliceComponent *
_parse_splice_component (GstMpegtsSCTESpliceEvent * event, guint8 ** orig_data,
guint8 * end)
{
GstMpegtsSCTESpliceComponent *component =
g_slice_new0 (GstMpegtsSCTESpliceComponent);
guint8 *data = *orig_data;
if (data + 1 + 6 > end)
goto error;
component->tag = *data;
data += 1;
if (event->insert_event && event->splice_immediate_flag == 0) {
component->splice_time_specified = *data >> 7;
if (component->splice_time_specified) {
component->splice_time = ((guint64) (*data & 0x01)) << 32;
data += 1;
component->splice_time += GST_READ_UINT32_BE (data);
data += 4;
GST_LOG ("component %u splice_time %" G_GUINT64_FORMAT " (%"
GST_TIME_FORMAT ")", component->tag, component->splice_time,
GST_TIME_ARGS (MPEGTIME_TO_GSTTIME (component->splice_time)));
} else {
data += 1;
}
} else if (!event->insert_event) {
component->utc_splice_time = GST_READ_UINT32_BE (data);
GST_LOG ("component %u utc_splice_time %u", component->tag,
component->utc_splice_time);
data += 4;
}
*orig_data = data;
return component;
error:
{
if (event)
_gst_mpegts_scte_splice_event_free (event);
return NULL;
}
}
static GstMpegtsSCTESpliceEvent *
_parse_splice_event (guint8 ** orig_data, guint8 * end, gboolean insert_event)
{
@ -66,6 +137,9 @@ _parse_splice_event (guint8 ** orig_data, guint8 * end, gboolean insert_event)
if (data + 5 + 6 > end)
goto error;
event->components = g_ptr_array_new_with_free_func ((GDestroyNotify)
_gst_mpegts_scte_splice_component_free);
event->insert_event = insert_event;
event->splice_event_id = GST_READ_UINT32_BE (data);
GST_LOG ("splice_event_id: 0x%08x", event->splice_event_id);
@ -97,10 +171,19 @@ _parse_splice_event (guint8 ** orig_data, guint8 * end, gboolean insert_event)
data += 1;
if (event->program_splice_flag == 0) {
GST_ERROR ("Component splice flag not supported !");
goto error;
}
guint component_count = *data;
guint i;
data += 1;
for (i = 0; i < component_count; i++) {
GstMpegtsSCTESpliceComponent *component =
_parse_splice_component (event, &data, end);
if (component == NULL)
goto error;
g_ptr_array_add (event->components, component);
}
} else {
if (insert_event && event->splice_immediate_flag == 0) {
event->program_splice_time_specified = *data >> 7;
if (event->program_splice_time_specified) {
@ -108,8 +191,8 @@ _parse_splice_event (guint8 ** orig_data, guint8 * end, gboolean insert_event)
data += 1;
event->program_splice_time += GST_READ_UINT32_BE (data);
data += 4;
GST_LOG ("program_splice_time %" G_GUINT64_FORMAT " (%" GST_TIME_FORMAT
")", event->program_splice_time,
GST_LOG ("program_splice_time %" G_GUINT64_FORMAT " (%"
GST_TIME_FORMAT ")", event->program_splice_time,
GST_TIME_ARGS (MPEGTIME_TO_GSTTIME (event->program_splice_time)));
} else
data += 1;
@ -118,6 +201,7 @@ _parse_splice_event (guint8 ** orig_data, guint8 * end, gboolean insert_event)
GST_LOG ("utc_splice_time %u", event->utc_splice_time);
data += 4;
}
}
if (event->duration_flag) {
event->break_duration_auto_return = *data >> 7;
@ -513,10 +597,33 @@ gst_mpegts_scte_splice_event_new (void)
/* Non-0 Default values */
event->program_splice_flag = TRUE;
event->components = g_ptr_array_new_with_free_func ((GDestroyNotify)
_gst_mpegts_scte_splice_component_free);
return event;
}
/**
* gst_mpegts_scte_splice_component_new:
* tag: the elementary PID stream identifier
*
* Allocates and initializes a #GstMpegtsSCTESpliceComponent.
*
* Returns: (transfer full): A newly allocated #GstMpegtsSCTESpliceComponent
* Since: 1.20
*/
GstMpegtsSCTESpliceComponent *
gst_mpegts_scte_splice_component_new (guint8 tag)
{
GstMpegtsSCTESpliceComponent *component =
g_slice_new0 (GstMpegtsSCTESpliceComponent);
component->tag = tag;
return component;
}
static gboolean
_packetize_sit (GstMpegtsSection * section)
{

29
subprojects/gst-plugins-bad/gst-libs/gst/mpegts/gst-scte-section.h
View file

@ -103,6 +103,18 @@ typedef enum {
} GstMpegtsSectionSCTETableID;
#define GST_TYPE_MPEGTS_SCTE_SPLICE_COMPONENT (gst_mpegts_scte_splice_component_get_type())
typedef struct _GstMpegtsSCTESpliceComponent GstMpegtsSCTESpliceComponent;
struct _GstMpegtsSCTESpliceComponent {
guint8 tag;
gboolean splice_time_specified; /* Only valid for insert_event */
guint64 splice_time; /* Only valid for insert_event */
guint32 utc_splice_time; /* Only valid for !insert_event (schedule) */
};
/* Splice Information Table (SIT) */
#define GST_TYPE_MPEGTS_SCTE_SPLICE_EVENT (gst_mpegts_scte_splice_event_get_type())
typedef struct _GstMpegtsSCTESpliceEvent GstMpegtsSCTESpliceEvent;
@ -116,14 +128,17 @@ struct _GstMpegtsSCTESpliceEvent {
/* If splice_event_cancel_indicator == 0 */
gboolean out_of_network_indicator;
gboolean program_splice_flag; /* NOTE: Only program splice are supported */
gboolean program_splice_flag;
gboolean duration_flag;
gboolean splice_immediate_flag; /* Only valid for insert_event */
gboolean program_splice_time_specified; /* Only valid for insert_event */
guint64 program_splice_time; /* Only valid for insert_event */
guint32 utc_splice_time; /* Only valid for !insert_event (schedule) */
gboolean program_splice_time_specified; /* Only valid for insert_event && program_splice */
guint64 program_splice_time; /* Only valid for insert_event && program_splice */
guint32 utc_splice_time; /* Only valid for !insert_event (schedule) && program_splice */
GPtrArray *components; /* Only valid for !program_splice */
gboolean break_duration_auto_return;
guint64 break_duration;
@ -219,6 +234,12 @@ const GstMpegtsSCTESIT *gst_mpegts_section_get_scte_sit (GstMpegtsSection *secti
GST_MPEGTS_API
GstMpegtsSection *gst_mpegts_section_from_scte_sit (GstMpegtsSCTESIT * sit, guint16 pid);
GST_MPEGTS_API
GType gst_mpegts_scte_splice_component_get_type (void);
GST_MPEGTS_API
GstMpegtsSCTESpliceComponent *gst_mpegts_scte_splice_component_new (guint8 tag);
G_END_DECLS