[Asterisk-code-review] res format attr vp8: In SDP, forward max-fr and max-fs for v... (asterisk[master])
Matt Jordan
asteriskteam at digium.com
Fri Dec 4 11:34:16 CST 2015
Matt Jordan has submitted this change and it was merged.
Change subject: res_format_attr_vp8: In SDP, forward max-fr and max-fs for video-codec VP8.
......................................................................
res_format_attr_vp8: In SDP, forward max-fr and max-fs for video-codec VP8.
ASTERISK-25584 #close
Change-Id: Iae00071b4ff1ae76f24995aeac4d00284fd14f91
---
M CHANGES
A res/res_format_attr_vp8.c
2 files changed, 233 insertions(+), 0 deletions(-)
Approvals:
Richard Mudgett: Looks good to me, but someone else must approve
Anonymous Coward #1000019: Verified
Matt Jordan: Looks good to me, approved
diff --git a/CHANGES b/CHANGES
index 2b9f8e6..1180fbf 100644
--- a/CHANGES
+++ b/CHANGES
@@ -213,6 +213,11 @@
several esoteric issues that can occur when channels are removed from a
bridge after completing a T.38 fax.
+Codecs
+------------------
+ * Added format attribute negotiation for the VP8 video codec. Format attribute
+ negotiation is provided by the res_format_attr_vp8 module.
+
ConfBridge
------------------
* A new "timeout" user profile option has been added. This configures the number
diff --git a/res/res_format_attr_vp8.c b/res/res_format_attr_vp8.c
new file mode 100644
index 0000000..777239a
--- /dev/null
+++ b/res/res_format_attr_vp8.c
@@ -0,0 +1,228 @@
+/*
+ * Asterisk -- An open source telephony toolkit.
+ *
+ * Copyright (C) 2015, Alexander Traud
+ *
+ * Alexander Traud <pabstraud at compuserve.com>
+ *
+ * See http://www.asterisk.org for more information about
+ * the Asterisk project. Please do not directly contact
+ * any of the maintainers of this project for assistance;
+ * the project provides a web site, mailing lists and IRC
+ * channels for your use.
+ *
+ * This program is free software, distributed under the terms of
+ * the GNU General Public License Version 2. See the LICENSE file
+ * at the top of the source tree.
+ */
+
+/*!
+ * \file
+ * \brief VP8 format attribute interface
+ *
+ * \author Alexander Traud <pabstraud at compuserve.com>
+ *
+ * \note http://tools.ietf.org/html/draft-ietf-payload-vp8
+ */
+
+/*** MODULEINFO
+ <support_level>core</support_level>
+ ***/
+
+#include "asterisk.h"
+
+ASTERISK_REGISTER_FILE()
+
+#include "asterisk/module.h"
+#include "asterisk/format.h"
+#include "asterisk/logger.h" /* for ast_log, LOG_WARNING */
+#include "asterisk/strings.h" /* for ast_str_append */
+#include "asterisk/utils.h" /* for MIN, ast_malloc, ast_free */
+
+struct vp8_attr {
+ unsigned int maximum_frame_rate;
+ unsigned int maximum_frame_size;
+};
+
+static struct vp8_attr default_vp8_attr = {
+ .maximum_frame_rate = UINT_MAX,
+ .maximum_frame_size = UINT_MAX,
+};
+
+static void vp8_destroy(struct ast_format *format)
+{
+ struct vp8_attr *attr = ast_format_get_attribute_data(format);
+
+ ast_free(attr);
+}
+
+static int vp8_clone(const struct ast_format *src, struct ast_format *dst)
+{
+ struct vp8_attr *original = ast_format_get_attribute_data(src);
+ struct vp8_attr *attr = ast_malloc(sizeof(*attr));
+
+ if (!attr) {
+ return -1;
+ }
+
+ if (original) {
+ *attr = *original;
+ } else {
+ *attr = default_vp8_attr;
+ }
+
+ ast_format_set_attribute_data(dst, attr);
+
+ return 0;
+}
+
+static struct ast_format *vp8_parse_sdp_fmtp(const struct ast_format *format, const char *attributes)
+{
+ struct ast_format *cloned;
+ struct vp8_attr *attr;
+ const char *kvp;
+ unsigned int val;
+
+ cloned = ast_format_clone(format);
+ if (!cloned) {
+ return NULL;
+ }
+ attr = ast_format_get_attribute_data(cloned);
+
+ if ((kvp = strstr(attributes, "max-fr")) && sscanf(kvp, "max-fr=%30u", &val) == 1) {
+ attr->maximum_frame_rate = val;
+ } else {
+ attr->maximum_frame_rate = UINT_MAX;
+ }
+
+ if ((kvp = strstr(attributes, "max-fs")) && sscanf(kvp, "max-fs=%30u", &val) == 1) {
+ attr->maximum_frame_size = val;
+ } else {
+ attr->maximum_frame_size = UINT_MAX;
+ }
+
+ return cloned;
+}
+
+static void vp8_generate_sdp_fmtp(const struct ast_format *format, unsigned int payload, struct ast_str **str)
+{
+ struct vp8_attr *attr = ast_format_get_attribute_data(format);
+ int added = 0;
+
+ if (!attr) {
+ /*
+ * (Only) cached formats do not have attribute data assigned because
+ * they were created before this attribute module was registered.
+ * Therefore, we assume the default attribute values here.
+ */
+ attr = &default_vp8_attr;
+ }
+
+ if (UINT_MAX != attr->maximum_frame_rate) {
+ if (added) {
+ ast_str_append(str, 0, ";");
+ } else if (0 < ast_str_append(str, 0, "a=fmtp:%u ", payload)) {
+ added = 1;
+ }
+ ast_str_append(str, 0, "max-fr=%u", attr->maximum_frame_rate);
+ }
+
+ if (UINT_MAX != attr->maximum_frame_size) {
+ if (added) {
+ ast_str_append(str, 0, ";");
+ } else if (0 < ast_str_append(str, 0, "a=fmtp:%u ", payload)) {
+ added = 1;
+ }
+ ast_str_append(str, 0, "max-fs=%u", attr->maximum_frame_size);
+ }
+
+ if (added) {
+ ast_str_append(str, 0, "\r\n");
+ }
+}
+
+static struct ast_format *vp8_getjoint(const struct ast_format *format1, const struct ast_format *format2)
+{
+ struct vp8_attr *attr1 = ast_format_get_attribute_data(format1);
+ struct vp8_attr *attr2 = ast_format_get_attribute_data(format2);
+ struct ast_format *jointformat;
+ struct vp8_attr *attr_res;
+
+ if (!attr1) {
+ attr1 = &default_vp8_attr;
+ }
+
+ if (!attr2) {
+ attr2 = &default_vp8_attr;
+ }
+
+ jointformat = ast_format_clone(format1);
+ if (!jointformat) {
+ return NULL;
+ }
+ attr_res = ast_format_get_attribute_data(jointformat);
+
+ attr_res->maximum_frame_rate = MIN(attr1->maximum_frame_rate, attr2->maximum_frame_rate);
+ attr_res->maximum_frame_size = MIN(attr1->maximum_frame_size, attr2->maximum_frame_size);
+
+ return jointformat;
+}
+
+static struct ast_format *vp8_set(const struct ast_format *format, const char *name, const char *value)
+{
+ struct ast_format *cloned;
+ struct vp8_attr *attr;
+ unsigned int val;
+
+ if (sscanf(value, "%30u", &val) != 1) {
+ ast_log(LOG_WARNING, "Unknown value '%s' for attribute type '%s'\n",
+ value, name);
+ return NULL;
+ }
+
+ cloned = ast_format_clone(format);
+ if (!cloned) {
+ return NULL;
+ }
+ attr = ast_format_get_attribute_data(cloned);
+
+ if (!strcasecmp(name, "maximum_frame_rate")) {
+ attr->maximum_frame_rate = val;
+ } else if (!strcasecmp(name, "maximum_frame_size")) {
+ attr->maximum_frame_size = val;
+ } else {
+ ast_log(LOG_WARNING, "unknown attribute type %s\n", name);
+ }
+
+ return cloned;
+}
+
+static struct ast_format_interface vp8_interface = {
+ .format_destroy = vp8_destroy,
+ .format_clone = vp8_clone,
+ .format_get_joint = vp8_getjoint,
+ .format_attribute_set = vp8_set,
+ .format_parse_sdp_fmtp = vp8_parse_sdp_fmtp,
+ .format_generate_sdp_fmtp = vp8_generate_sdp_fmtp,
+};
+
+static int load_module(void)
+{
+ if (ast_format_interface_register("vp8", &vp8_interface)) {
+ return AST_MODULE_LOAD_DECLINE;
+ }
+
+ return AST_MODULE_LOAD_SUCCESS;
+}
+
+static int unload_module(void)
+{
+ return 0;
+}
+
+AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "VP8 Format Attribute Module",
+ .support_level = AST_MODULE_SUPPORT_CORE,
+ .load = load_module,
+ .unload = unload_module,
+ .load_pri = AST_MODPRI_CHANNEL_DEPEND,
+);
--
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Gerrit-MessageType: merged
Gerrit-Change-Id: Iae00071b4ff1ae76f24995aeac4d00284fd14f91
Gerrit-PatchSet: 4
Gerrit-Project: asterisk
Gerrit-Branch: master
Gerrit-Owner: Alexander Traud <pabstraud at compuserve.com>
Gerrit-Reviewer: Alexander Traud <pabstraud at compuserve.com>
Gerrit-Reviewer: Anonymous Coward #1000019
Gerrit-Reviewer: Joshua Colp <jcolp at digium.com>
Gerrit-Reviewer: Matt Jordan <mjordan at digium.com>
Gerrit-Reviewer: Richard Mudgett <rmudgett at digium.com>
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