gstreamer/subprojects/gst-plugins-good/ext/adaptivedemux2/dash/gstmpdhelper.c
Edward Hervey af78c16dd5 New HLS, DASH and MSS adaptive demuxer elements
This provides new HLS, DASH and MSS adaptive demuxer elements as a single plugin.

These elements offer many improvements over the legacy elements. They will only
work within a streams-aware context (`urisourcebin`, `uridecodebin3`,
`decodebin3`, `playbin3`, ...).

Stream selection and buffering is handled internally, this allows them to
directly manage the elementary streams and stream selection.

Authors:
* Edward Hervey <edward@centricular.com>
* Jan Schmidt <jan@centricular.com>
* Piotrek Brzeziński <piotr@centricular.com>
* Tim-Philipp Müller <tim@centricular.com>

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/2117>
2022-04-18 14:11:23 +00:00

214 lines
5.5 KiB
C

/* GStreamer
*
* Copyright (C) 2019 Collabora Ltd.
* Author: Stéphane Cerveau <scerveau@collabora.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#include "gstmpdhelper.h"
#include "gstmpdbaseurlnode.h"
#include <gst/pbutils/pbutils.h>
#define GST_CAT_DEFAULT gst_dash_demux2_debug
gboolean
gst_mpd_helper_get_mpd_type (xmlNode * a_node,
const gchar * property_name, GstMPDFileType * property_value)
{
xmlChar *prop_string;
gboolean exists = FALSE;
*property_value = GST_MPD_FILE_TYPE_STATIC; /* default */
prop_string = xmlGetProp (a_node, (const xmlChar *) property_name);
if (prop_string) {
if (xmlStrcmp (prop_string, (xmlChar *) "OnDemand") == 0
|| xmlStrcmp (prop_string, (xmlChar *) "static") == 0) {
exists = TRUE;
*property_value = GST_MPD_FILE_TYPE_STATIC;
GST_LOG (" - %s: static", property_name);
} else if (xmlStrcmp (prop_string, (xmlChar *) "Live") == 0
|| xmlStrcmp (prop_string, (xmlChar *) "dynamic") == 0) {
exists = TRUE;
*property_value = GST_MPD_FILE_TYPE_DYNAMIC;
GST_LOG (" - %s: dynamic", property_name);
} else {
GST_WARNING ("failed to parse MPD type property %s from xml string %s",
property_name, prop_string);
}
xmlFree (prop_string);
}
return exists;
}
gboolean
gst_mpd_helper_get_SAP_type (xmlNode * a_node,
const gchar * property_name, GstMPDSAPType * property_value)
{
xmlChar *prop_string;
guint prop_SAP_type = 0;
gboolean exists = FALSE;
prop_string = xmlGetProp (a_node, (const xmlChar *) property_name);
if (prop_string) {
if (sscanf ((gchar *) prop_string, "%u", &prop_SAP_type) == 1
&& prop_SAP_type <= 6) {
exists = TRUE;
*property_value = (GstMPDSAPType) prop_SAP_type;
GST_LOG (" - %s: %u", property_name, prop_SAP_type);
} else {
GST_WARNING
("failed to parse unsigned integer property %s from xml string %s",
property_name, prop_string);
}
xmlFree (prop_string);
}
return exists;
}
const gchar *
gst_mpd_helper_get_audio_codec_from_mime (GstCaps * caps)
{
GstStructure *s;
const gchar *name = "";
const gchar *codec_name = NULL;
if (!caps)
return NULL;
s = gst_caps_get_structure (caps, 0);
if (!s)
goto done;
name = gst_structure_get_name (s);
if (!g_strcmp0 (name, "audio/mpeg")) {
gint mpeg_version;
if (gst_structure_get_int (s, "mpegversion", &mpeg_version)) {
if (mpeg_version == 4)
return "mp4a";
}
} else {
GST_DEBUG ("No codecs for this caps name %s", name);
}
done:
return codec_name;
}
const gchar *
gst_mpd_helper_get_video_codec_from_mime (GstCaps * caps)
{
GstStructure *s;
const gchar *name = "";
const gchar *codec_name = NULL;
if (!caps)
return NULL;
s = gst_caps_get_structure (caps, 0);
if (!s)
goto done;
name = gst_structure_get_name (s);
if (!g_strcmp0 (name, "video/x-h264")) {
return "avc1";
} else if (!g_strcmp0 (name, "video/x-h265")) {
return "hvc1";
} else {
GST_DEBUG ("No codecs for this caps name %s", name);
}
done:
return codec_name;
}
const gchar *
gst_mpd_helper_mimetype_to_caps (const gchar * mimeType)
{
if (mimeType == NULL)
return NULL;
if (strcmp (mimeType, "video/mp2t") == 0) {
return "video/mpegts, systemstream=(bool) true";
} else if (strcmp (mimeType, "video/mp4") == 0) {
return "video/quicktime";
} else if (strcmp (mimeType, "audio/mp4") == 0) {
return "audio/x-m4a";
} else if (strcmp (mimeType, "text/vtt") == 0) {
return "application/x-subtitle-vtt";
} else
return mimeType;
}
/* Some top-level mime types directly tell us which
* codec is inside */
GstCaps *
gst_mpd_helper_mimetype_to_codec_caps (const gchar * mimeType)
{
if (mimeType == NULL)
return NULL;
if (strcmp (mimeType, "text/vtt") == 0)
return gst_caps_new_empty_simple ("application/x-subtitle-vtt");
return NULL;
}
/*
* Combine a base url with the current stream base url from the list of
* baseURLs. Takes ownership of base and returns a new base.
*/
GstUri *
gst_mpd_helper_combine_urls (GstUri * base, GList * list, gchar ** query,
guint idx)
{
GstMPDBaseURLNode *baseURL;
GstUri *ret = base;
if (list != NULL) {
baseURL = g_list_nth_data (list, idx);
if (!baseURL) {
baseURL = list->data;
}
ret = gst_uri_from_string_with_base (base, baseURL->baseURL);
gst_uri_unref (base);
if (ret && query) {
g_free (*query);
*query = gst_uri_get_query_string (ret);
if (*query) {
ret = gst_uri_make_writable (ret);
gst_uri_set_query_table (ret, NULL);
}
}
}
return ret;
}
/* comparison functions */
int
gst_mpd_helper_strncmp_ext (const char *s1, const char *s2)
{
if (s1 == NULL && s2 == NULL)
return 0;
if (s1 == NULL && s2 != NULL)
return 1;
if (s2 == NULL && s1 != NULL)
return 1;
return strncmp (s1, s2, strlen (s2));
}