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flvmux: Force timestamps to always be increasing

Browse source 
https://bugzilla.gnome.org/show_bug.cgi?id=796382
This commit is contained in:
Olivier Crête 2018-10-27 19:27:12 +01:00
parent dd5c6fe330
commit fea0d0b1a4
2 changed files with 16 additions and 0 deletions
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15
gst/flv/gstflvmux.c
View file

@ -322,6 +322,7 @@ gst_flv_mux_reset (GstElement * element)
mux->duration = GST_CLOCK_TIME_NONE; mux->duration = GST_CLOCK_TIME_NONE;
mux->new_tags = FALSE; mux->new_tags = FALSE;
mux->first_timestamp = GST_CLOCK_STIME_NONE; mux->first_timestamp = GST_CLOCK_STIME_NONE;
mux->last_dts = 0;
mux->state = GST_FLV_MUX_STATE_HEADER; mux->state = GST_FLV_MUX_STATE_HEADER;
mux->sent_header = FALSE; mux->sent_header = FALSE;
@ -1145,6 +1146,19 @@ gst_flv_mux_buffer_to_tag_internal (GstFlvMux * mux, GstBuffer * buffer,
dts = pad->dts / GST_MSECOND; dts = pad->dts / GST_MSECOND;
} }
/* We prevent backwards timestamps because they confuse librtmp,
* it expects timestamps to go forward not only inside one stream, but
* also between the audio & video streams.
*/
if (dts < mux->last_dts) {
GST_WARNING_OBJECT (pad, "Got backwards dts! (%" GST_TIME_FORMAT
" < %" GST_TIME_FORMAT ")", GST_TIME_ARGS (dts),
GST_TIME_ARGS (mux->last_dts));
dts = mux->last_dts;
}
mux->last_dts = dts;
/* Be safe in case TS are buggy */ /* Be safe in case TS are buggy */
if (pts > dts) if (pts > dts)
cts = pts - dts; cts = pts - dts;
@ -1190,6 +1204,7 @@ gst_flv_mux_buffer_to_tag_internal (GstFlvMux * mux, GstBuffer * buffer,
data[2] = ((size - 11 - 4) >> 8) & 0xff; data[2] = ((size - 11 - 4) >> 8) & 0xff;
data[3] = ((size - 11 - 4) >> 0) & 0xff; data[3] = ((size - 11 - 4) >> 0) & 0xff;
GST_WRITE_UINT24_BE (data + 4, dts); GST_WRITE_UINT24_BE (data + 4, dts);
data[7] = (((guint) dts) >> 24) & 0xff; data[7] = (((guint) dts) >> 24) & 0xff;

1
gst/flv/gstflvmux.h
View file

@ -98,6 +98,7 @@ typedef struct _GstFlvMux {
guint64 byte_count; guint64 byte_count;
guint64 duration; guint64 duration;
gint64 first_timestamp; gint64 first_timestamp;
GstClockTime last_dts;
gboolean sent_header; gboolean sent_header;
} GstFlvMux; } GstFlvMux;