From 1f6ba1d28011929789612b51ddb888ca8353ceb7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sebastian=20Dr=C3=B6ge?= <slomo@circular-chaos.org>
Date: Thu, 9 Oct 2008 16:20:26 +0000
Subject: gst/flv/: Get an approximate duration of the file by looking at the
 timestamp of the last tag in pull mode. If we get...

Original commit message from CVS:
* gst/flv/gstflvdemux.c: (gst_flv_demux_loop):
* gst/flv/gstflvparse.c: (gst_flv_parse_tag_timestamp):
* gst/flv/gstflvparse.h:
Get an approximate duration of the file by looking at the timestamp
of the last tag in pull mode. If we get (maybe better) duration from
metadata later we'll use that instead.
---
 gst/flv/gstflvdemux.c | 32 ++++++++++++++++++++++++++++++++
 gst/flv/gstflvparse.c | 31 +++++++++++++++++++++++++++++++
 gst/flv/gstflvparse.h |  2 ++
 3 files changed, 65 insertions(+)

(limited to 'gst')

diff --git a/gst/flv/gstflvdemux.c b/gst/flv/gstflvdemux.c
index dc148507..8cc74f1d 100644
--- a/gst/flv/gstflvdemux.c
+++ b/gst/flv/gstflvdemux.c
@@ -443,6 +443,38 @@ gst_flv_demux_loop (GstPad * pad)
         break;
       default:
         ret = gst_flv_demux_pull_header (pad, demux);
+
+        /* If we parsed the header successfully try to get an
+         * approximate duration by looking at the last tag's timestamp */
+        if (ret == GST_FLOW_OK) {
+          gint64 size;
+          GstFormat fmt = GST_FORMAT_BYTES;
+
+          if (gst_pad_query_peer_duration (pad, &fmt, &size) &&
+              fmt == GST_FORMAT_BYTES && size != -1 && size > FLV_HEADER_SIZE) {
+            GstBuffer *buffer;
+
+            if (gst_flv_demux_pull_range (demux, pad, size - 4, 4,
+                    &buffer) == GST_FLOW_OK) {
+              guint32 prev_tag_size =
+                  GST_READ_UINT32_BE (GST_BUFFER_DATA (buffer));
+
+              gst_buffer_unref (buffer);
+
+              if (size - 4 - prev_tag_size > FLV_HEADER_SIZE &&
+                  prev_tag_size >= 8 &&
+                  gst_flv_demux_pull_range (demux, pad,
+                      size - prev_tag_size - 4, prev_tag_size,
+                      &buffer) == GST_FLOW_OK) {
+                demux->duration =
+                    gst_flv_parse_tag_timestamp (demux,
+                    GST_BUFFER_DATA (buffer), GST_BUFFER_SIZE (buffer));
+
+                gst_buffer_unref (buffer);
+              }
+            }
+          }
+        }
     }
 
     /* pause if something went wrong */
diff --git a/gst/flv/gstflvparse.c b/gst/flv/gstflvparse.c
index fd51cbfe..c5545054 100644
--- a/gst/flv/gstflvparse.c
+++ b/gst/flv/gstflvparse.c
@@ -1006,6 +1006,37 @@ beach:
   return ret;
 }
 
+GstClockTime
+gst_flv_parse_tag_timestamp (GstFLVDemux * demux, const guint8 * data,
+    size_t data_size)
+{
+  guint32 pts = 0, pts_ext = 0;
+
+  if (data[0] != 9 && data[0] != 8 && data[0] != 18) {
+    GST_WARNING_OBJECT (demux, "Unsupported tag type %u", data[0]);
+    return GST_CLOCK_TIME_NONE;
+  }
+
+  if (FLV_GET_BEUI24 (data + 1, data_size - 1) != data_size - 11) {
+    GST_WARNING_OBJECT (demux, "Invalid tag");
+    return GST_CLOCK_TIME_NONE;
+  }
+
+  data += 4;
+
+  GST_LOG_OBJECT (demux, "pts bytes %02X %02X %02X %02X", data[0], data[1],
+      data[2], data[3]);
+
+  /* Grab timestamp of tag tag */
+  pts = FLV_GET_BEUI24 (data, data_size);
+  /* read the pts extension to 32 bits integer */
+  pts_ext = GST_READ_UINT8 (data + 3);
+  /* Combine them */
+  pts |= pts_ext << 24;
+
+  return pts * GST_MSECOND;
+}
+
 GstFlowReturn
 gst_flv_parse_tag_type (GstFLVDemux * demux, const guint8 * data,
     size_t data_size)
diff --git a/gst/flv/gstflvparse.h b/gst/flv/gstflvparse.h
index 7b9d498e..0dfeaa97 100644
--- a/gst/flv/gstflvparse.h
+++ b/gst/flv/gstflvparse.h
@@ -38,5 +38,7 @@ GstFlowReturn gst_flv_parse_tag_type (GstFLVDemux * demux, const guint8 * data,
 GstFlowReturn gst_flv_parse_header (GstFLVDemux * demux, const guint8 * data,
     size_t data_size);
 
+GstClockTime gst_flv_parse_tag_timestamp (GstFLVDemux *demux, const guint8 *data, size_t data_size);
+
 G_END_DECLS
 #endif /* __FLV_PARSE_H__ */
-- 
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