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mpegtsbase: Check harder for program changes

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And don't just rely on the section crc/version_number changing to
indicate that the program actually changed.
This commit is contained in:
Edward Hervey 2012-03-02 10:54:48 +01:00
parent 044df35560
commit 671550714f
1 changed files with 78 additions and 0 deletions
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78
gst/mpegtsdemux/mpegtsbase.c
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@ -569,6 +569,74 @@ mpegts_base_program_remove_stream (MpegTSBase * base,
program->streams[pid] = NULL;
}
/* Return TRUE if programs are equal */
static gboolean
mpegts_base_is_same_program (MpegTSBase * base, MpegTSBaseProgram * oldprogram,
guint16 new_pmt_pid, GstStructure * new_pmt_info)
{
guint i, nbstreams;
guint pcr_pid;
guint pid;
guint stream_type;
GstStructure *stream;
MpegTSBaseStream *oldstream;
gboolean sawpcrpid = FALSE;
const GValue *new_streams;
const GValue *value;
if (oldprogram->pmt_pid != new_pmt_pid) {
GST_DEBUG ("Different pmt_pid (new:0x%04x, old:0x%04x)", new_pmt_pid,
oldprogram->pmt_pid);
return FALSE;
}
gst_structure_id_get (new_pmt_info, QUARK_PCR_PID, G_TYPE_UINT, &pcr_pid,
NULL);
if (oldprogram->pcr_pid != pcr_pid) {
GST_DEBUG ("Different pcr_pid (new:0x%04x, old:0x%04x)",
pcr_pid, oldprogram->pcr_pid);
return FALSE;
}
/* Check the streams */
new_streams = gst_structure_id_get_value (new_pmt_info, QUARK_STREAMS);
nbstreams = gst_value_list_get_size (new_streams);
for (i = 0; i < nbstreams; ++i) {
value = gst_value_list_get_value (new_streams, i);
stream = g_value_get_boxed (value);
gst_structure_id_get (stream, QUARK_PID, G_TYPE_UINT, &pid,
QUARK_STREAM_TYPE, G_TYPE_UINT, &stream_type, NULL);
oldstream = oldprogram->streams[pid];
if (!oldstream) {
GST_DEBUG ("New stream 0x%04x not present in old program", pid);
return FALSE;
}
if (oldstream->stream_type != stream_type) {
GST_DEBUG
("New stream 0x%04x has a different stream type (new:%d, old:%d)",
pid, stream_type, oldstream->stream_type);
return FALSE;
}
if (pid == oldprogram->pcr_pid)
sawpcrpid = TRUE;
}
/* If the pcr is not shared with an existing stream, we'll have one extra stream */
if (!sawpcrpid)
nbstreams += 1;
if (nbstreams != g_list_length (oldprogram->stream_list)) {
GST_DEBUG ("Different number of streams (new:%d, old:%d)",
nbstreams, g_list_length (oldprogram->stream_list));
return FALSE;
}
GST_DEBUG ("Programs are equal");
return TRUE;
}
static void
mpegts_base_deactivate_program (MpegTSBase * base, MpegTSBaseProgram * program)
{
@ -878,6 +946,10 @@ mpegts_base_apply_pmt (MpegTSBase * base,
if (G_UNLIKELY (old_program == NULL))
goto no_program;
if (G_UNLIKELY (mpegts_base_is_same_program (base, old_program, pmt_pid,
pmt_info)))
goto same_program;
/* If the current program is active, this means we have a new program */
if (old_program->active) {
old_program = mpegts_base_steal_program (base, program_number);
@ -911,6 +983,12 @@ no_program:
GST_ERROR ("Attempted to apply a PMT on a program that wasn't created");
return;
}
same_program:
{
GST_DEBUG ("Not applying identical program");
return;
}
}
static void