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mssmanifest: Keep the stream qualities list sorted by bitrate

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This will help making adaptive streaming chose the best rate
for a particular connection speed
This commit is contained in:
Thiago Santos 2013-01-08 11:08:39 -03:00
parent 013c11f7dd
commit eec8164d9c
1 changed files with 57 additions and 12 deletions
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69
ext/smoothstreaming/gstmssmanifest.c
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@ -52,6 +52,14 @@ typedef struct _GstMssStreamFragment
guint64 duration;
} GstMssStreamFragment;
typedef struct _GstMssStreamQuality
{
xmlNodePtr xmlnode;
gchar *bitrate_str;
guint64 bitrate;
} GstMssStreamQuality;
struct _GstMssStream
{
xmlNodePtr xmlnode;
@ -85,6 +93,38 @@ node_has_type (xmlNodePtr node, const gchar * name)
return strcmp ((gchar *) node->name, name) == 0;
}
static GstMssStreamQuality *
gst_mss_stream_quality_new (xmlNodePtr node)
{
GstMssStreamQuality *q = g_slice_new (GstMssStreamQuality);
q->xmlnode = node;
q->bitrate_str = (gchar *) xmlGetProp (node, (xmlChar *) MSS_PROP_BITRATE);
q->bitrate = strtoull (q->bitrate_str, NULL, 10);
return q;
}
static void
gst_mss_stream_quality_free (GstMssStreamQuality * quality)
{
g_return_if_fail (quality != NULL);
g_free (quality->bitrate_str);
g_slice_free (GstMssStreamQuality, quality);
}
static gint
compare_bitrate (GstMssStreamQuality * a, GstMssStreamQuality * b)
{
if (a->bitrate > b->bitrate)
return 1;
if (a->bitrate < b->bitrate)
return -1;
return 0;
}
static void
_gst_mss_stream_init (GstMssStream * stream, xmlNodePtr node)
{
@ -145,14 +185,18 @@ _gst_mss_stream_init (GstMssStream * stream, xmlNodePtr node)
stream->fragments = g_list_prepend (stream->fragments, fragment);
} else if (node_has_type (iter, MSS_NODE_STREAM_QUALITY)) {
stream->qualities = g_list_prepend (stream->qualities, iter);
GstMssStreamQuality *quality = gst_mss_stream_quality_new (iter);
stream->qualities = g_list_prepend (stream->qualities, quality);
} else {
/* TODO gst log this */
}
}
stream->fragments = g_list_reverse (stream->fragments);
stream->qualities = g_list_reverse (stream->qualities);
/* order them from smaller to bigger based on bitrates */
stream->qualities =
g_list_sort (stream->qualities, (GCompareFunc) compare_bitrate);
stream->current_fragment = stream->fragments;
stream->current_quality = stream->qualities;
@ -191,7 +235,8 @@ static void
gst_mss_stream_free (GstMssStream * stream)
{
g_list_free_full (stream->fragments, g_free);
g_list_free (stream->qualities);
g_list_free_full (stream->qualities,
(GDestroyNotify) gst_mss_stream_quality_free);
g_free (stream->url);
g_regex_unref (stream->regex_position);
g_regex_unref (stream->regex_bitrate);
@ -538,13 +583,17 @@ GstCaps *
gst_mss_stream_get_caps (GstMssStream * stream)
{
GstMssStreamType streamtype = gst_mss_stream_get_type (stream);
xmlNodePtr qualitylevel = stream->current_quality->data;
GstMssStreamQuality *qualitylevel = stream->current_quality->data;
GstCaps *caps = NULL;
if (streamtype == MSS_STREAM_TYPE_VIDEO)
caps = _gst_mss_stream_video_caps_from_qualitylevel_xml (qualitylevel);
caps =
_gst_mss_stream_video_caps_from_qualitylevel_xml
(qualitylevel->xmlnode);
else if (streamtype == MSS_STREAM_TYPE_AUDIO)
caps = _gst_mss_stream_audio_caps_from_qualitylevel_xml (qualitylevel);
caps =
_gst_mss_stream_audio_caps_from_qualitylevel_xml
(qualitylevel->xmlnode);
return caps;
}
@ -553,28 +602,24 @@ GstFlowReturn
gst_mss_stream_get_fragment_url (GstMssStream * stream, gchar ** url)
{
gchar *tmp;
gchar *bitrate_str;
gchar *start_time_str;
GstMssStreamFragment *fragment;
GstMssStreamQuality *quality = stream->current_quality->data;
if (stream->current_fragment == NULL) /* stream is over */
return GST_FLOW_UNEXPECTED;
fragment = stream->current_fragment->data;
bitrate_str =
(gchar *) xmlGetProp (stream->current_quality->data,
(xmlChar *) MSS_PROP_BITRATE);
start_time_str = g_strdup_printf ("%" G_GUINT64_FORMAT, fragment->time);
tmp = g_regex_replace_literal (stream->regex_bitrate, stream->url,
strlen (stream->url), 0, bitrate_str, 0, NULL);
strlen (stream->url), 0, quality->bitrate_str, 0, NULL);
*url = g_regex_replace_literal (stream->regex_position, tmp,
strlen (tmp), 0, start_time_str, 0, NULL);
g_free (tmp);
g_free (start_time_str);
g_free (bitrate_str);
return GST_FLOW_OK;
}