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asfdemux: Handle chained asfs on pull mode

Browse source 
Adds chained asfs handling to pull mode. It now checks if
there is a new asf header after the last packet (when it
is possible to know how many packets are) or it tries
checking if a processed packet that fails is an header
object.

Fixes #599718
This commit is contained in:
Thiago Santos 2009-11-09 13:30:45 -03:00
parent dc65baacf6
commit a155733bff
2 changed files with 119 additions and 19 deletions
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132
gst/asfdemux/gstasfdemux.c
View file

@ -225,8 +225,11 @@ gst_asf_demux_reset (GstASFDemux * demux, gboolean chain_reset)
--demux->num_streams;
}
memset (demux->stream, 0, sizeof (demux->stream));
demux->num_audio_streams = 0;
demux->num_video_streams = 0;
if (!chain_reset) {
/* do not remove those for not adding pads with same name */
demux->num_audio_streams = 0;
demux->num_video_streams = 0;
}
demux->num_streams = 0;
demux->activated_streams = FALSE;
demux->first_ts = GST_CLOCK_TIME_NONE;
@ -255,6 +258,8 @@ gst_asf_demux_reset (GstASFDemux * demux, gboolean chain_reset)
demux->data_size = 0;
demux->data_offset = 0;
demux->index_offset = 0;
} else {
demux->base_offset = 0;
}
}
@ -782,6 +787,22 @@ asf_demux_peek_object (GstASFDemux * demux, const guint8 * data,
return TRUE;
}
static void
gst_asf_demux_release_old_pads (GstASFDemux * demux)
{
GST_DEBUG_OBJECT (demux, "Releasing old pads");
while (demux->old_num_streams > 0) {
gst_pad_push_event (demux->old_stream[demux->old_num_streams - 1].pad,
gst_event_new_eos ());
gst_asf_demux_free_stream (demux,
&demux->old_stream[demux->old_num_streams - 1]);
--demux->old_num_streams;
}
memset (demux->old_stream, 0, sizeof (demux->old_stream));
demux->old_num_streams = 0;
}
static GstFlowReturn
gst_asf_demux_chain_headers (GstASFDemux * demux)
{
@ -814,15 +835,7 @@ gst_asf_demux_chain_headers (GstASFDemux * demux)
goto parse_failed;
/* release old pads (only happens on chained asfs) */
while (demux->old_num_streams > 0) {
gst_pad_push_event (demux->old_stream[demux->old_num_streams - 1].pad,
gst_event_new_eos ());
gst_asf_demux_free_stream (demux,
&demux->old_stream[demux->old_num_streams - 1]);
--demux->old_num_streams;
}
memset (demux->old_stream, 0, sizeof (demux->old_stream));
demux->old_num_streams = 0;
gst_asf_demux_release_old_pads (demux);
/* calculate where the packet data starts */
demux->data_offset = obj.size + 50;
@ -1028,7 +1041,7 @@ gst_asf_demux_pull_headers (GstASFDemux * demux)
GST_LOG_OBJECT (demux, "reading headers");
/* pull HEADER object header, so we know its size */
if (!gst_asf_demux_pull_data (demux, 0, 16 + 8, &buf, NULL))
if (!gst_asf_demux_pull_data (demux, demux->base_offset, 16 + 8, &buf, NULL))
goto read_failed;
asf_demux_peek_object (demux, GST_BUFFER_DATA (buf), 16 + 8, &obj, TRUE);
@ -1040,7 +1053,8 @@ gst_asf_demux_pull_headers (GstASFDemux * demux)
GST_LOG_OBJECT (demux, "header size = %u", (guint) obj.size);
/* pull HEADER object */
if (!gst_asf_demux_pull_data (demux, 0, obj.size, &buf, NULL))
if (!gst_asf_demux_pull_data (demux, demux->base_offset, obj.size, &buf,
NULL))
goto read_failed;
size = obj.size; /* don't want obj.size changed */
@ -1052,11 +1066,15 @@ gst_asf_demux_pull_headers (GstASFDemux * demux)
goto parse_failed;
}
/* release old pads (only happens on chained asfs) */
gst_asf_demux_release_old_pads (demux);
/* calculate where the packet data starts */
demux->data_offset = obj.size + 50;
demux->data_offset = demux->base_offset + obj.size + 50;
/* now pull beginning of DATA object before packet data */
if (!gst_asf_demux_pull_data (demux, obj.size, 50, &buf, NULL))
if (!gst_asf_demux_pull_data (demux, demux->base_offset + obj.size, 50, &buf,
NULL))
goto read_failed;
if (!gst_asf_demux_parse_data_object_start (demux, GST_BUFFER_DATA (buf)))
@ -1400,6 +1418,52 @@ gst_asf_demux_push_complete_payloads (GstASFDemux * demux, gboolean force)
return gst_asf_demux_aggregate_flow_return (demux);
}
static gboolean
gst_asf_demux_check_buffer_is_header (GstASFDemux * demux, GstBuffer * buf)
{
AsfObject obj;
g_assert (buf != NULL);
GST_LOG_OBJECT (demux, "Checking if buffer is a header");
/* we return false on buffer too small */
if (GST_BUFFER_SIZE (buf) < ASF_OBJECT_HEADER_SIZE)
return FALSE;
/* check if it is a header */
asf_demux_peek_object (demux, GST_BUFFER_DATA (buf),
ASF_OBJECT_HEADER_SIZE, &obj, TRUE);
if (obj.id == ASF_OBJ_HEADER) {
return TRUE;
}
return FALSE;
}
static gboolean
gst_asf_demux_check_chained_asf (GstASFDemux * demux)
{
guint64 off = demux->data_offset + (demux->packet * demux->packet_size);
GstFlowReturn ret = GST_FLOW_OK;
GstBuffer *buf = NULL;
gboolean header = FALSE;
/* TODO maybe we should skip index objects after the data and look
* further for a new header */
if (gst_asf_demux_pull_data (demux, off, ASF_OBJECT_HEADER_SIZE, &buf, &ret)) {
g_assert (buf != NULL);
/* check if it is a header */
if (gst_asf_demux_check_buffer_is_header (demux, buf)) {
GST_DEBUG_OBJECT (demux, "new base offset: %" G_GUINT64_FORMAT, off);
demux->base_offset = off;
header = TRUE;
}
gst_buffer_unref (buf);
}
return header;
}
static void
gst_asf_demux_loop (GstASFDemux * demux)
{
@ -1442,8 +1506,20 @@ gst_asf_demux_loop (GstASFDemux * demux)
if (G_LIKELY (demux->speed_packets == 1)) {
/* FIXME: maybe we should just skip broken packets and error out only
* after a few broken packets in a row? */
if (G_UNLIKELY (!gst_asf_demux_parse_packet (demux, buf)))
if (G_UNLIKELY (!gst_asf_demux_parse_packet (demux, buf))) {
/* when we don't know when the data object ends, we should check
* for a chained asf */
if (demux->num_packets == 0) {
if (gst_asf_demux_check_buffer_is_header (demux, buf)) {
GST_INFO_OBJECT (demux, "Chained asf found");
demux->base_offset = off;
gst_asf_demux_reset (demux, TRUE);
gst_buffer_unref (buf);
return;
}
}
goto parse_error;
}
flow = gst_asf_demux_push_complete_payloads (demux, FALSE);
@ -1459,8 +1535,21 @@ gst_asf_demux_loop (GstASFDemux * demux)
demux->packet_size);
/* FIXME: maybe we should just skip broken packets and error out only
* after a few broken packets in a row? */
if (G_UNLIKELY (!gst_asf_demux_parse_packet (demux, sub)))
if (G_UNLIKELY (!gst_asf_demux_parse_packet (demux, sub))) {
/* when we don't know when the data object ends, we should check
* for a chained asf */
if (demux->num_packets == 0) {
if (gst_asf_demux_check_buffer_is_header (demux, sub)) {
GST_INFO_OBJECT (demux, "Chained asf found");
demux->base_offset = off + n * demux->packet_size;
gst_asf_demux_reset (demux, TRUE);
gst_buffer_unref (sub);
gst_buffer_unref (buf);
return;
}
}
goto parse_error;
}
gst_buffer_unref (sub);
@ -1513,7 +1602,13 @@ eos:
gst_element_post_message (GST_ELEMENT_CAST (demux),
gst_message_new_segment_done (GST_OBJECT (demux), GST_FORMAT_TIME,
stop));
} else {
} else if (flow != GST_FLOW_UNEXPECTED) {
/* check if we have a chained asf, in case, we don't eos yet */
if (gst_asf_demux_check_chained_asf (demux)) {
GST_INFO_OBJECT (demux, "Chained ASF starting");
gst_asf_demux_reset (demux, TRUE);
return;
}
/* normal playback, send EOS to all linked pads */
GST_INFO_OBJECT (demux, "Sending EOS, at end of stream");
gst_asf_demux_send_event_unlocked (demux, gst_event_new_eos ());
@ -3827,6 +3922,7 @@ gst_asf_demux_change_state (GstElement * element, GstStateChange transition)
demux->data_size = 0;
demux->data_offset = 0;
demux->index_offset = 0;
demux->base_offset = 0;
break;
}
default:

6
gst/asfdemux/gstasfdemux.h
View file

@ -132,7 +132,11 @@ struct _GstASFDemux {
GstAdapter *adapter;
GstTagList *taglist;
GstAsfDemuxState state;
/* byte offset where the asf starts, which might not be zero on chained
* asfs, index_offset and data_offset already are 'offseted' by base_offset */
guint64 base_offset;
guint64 index_offset; /* byte offset where index might be, or 0 */
guint64 data_offset; /* byte offset where packets start */
guint64 data_size; /* total size of packet data in bytes, or 0 */