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acb5f5f824
git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@370060 65c4cc65-6c06-0410-ace0-fbb531ad65f3
306 lines
11 KiB
C
306 lines
11 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 2012, Digium, Inc.
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*
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* Joshua Colp <jcolp@digium.com>
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*
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* See http://www.asterisk.org for more information about
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* the Asterisk project. Please do not directly contact
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* any of the maintainers of this project for assistance;
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* the project provides a web site, mailing lists and IRC
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* channels for your use.
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License Version 2. See the LICENSE file
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* at the top of the source tree.
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*
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*/
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/*! \file
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*
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* \brief H.264 Format Attribute Module
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*
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* \author\verbatim Joshua Colp <jcolp@digium.com> \endverbatim
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*
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* This is a format attribute module for the H.264 codec.
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* \ingroup applications
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*/
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/*** MODULEINFO
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<support_level>core</support_level>
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***/
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#include "asterisk.h"
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ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
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#include "asterisk/module.h"
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#include "asterisk/format.h"
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/*! \brief Value that indicates an attribute is actually unset */
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#define H264_ATTR_KEY_UNSET UINT8_MAX
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/*! \brief Maximum size for SPS / PPS values in sprop-parameter-sets attribute */
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#define H264_MAX_SPS_PPS_SIZE 16
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enum h264_attr_keys {
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H264_ATTR_KEY_PROFILE_IDC,
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H264_ATTR_KEY_PROFILE_IOP,
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H264_ATTR_KEY_LEVEL,
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H264_ATTR_KEY_MAX_MBPS,
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H264_ATTR_KEY_MAX_FS,
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H264_ATTR_KEY_MAX_CPB,
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H264_ATTR_KEY_MAX_DPB,
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H264_ATTR_KEY_MAX_BR,
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H264_ATTR_KEY_REDUNDANT_PIC_CAP,
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H264_ATTR_KEY_PARAMETER_ADD,
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H264_ATTR_KEY_PACKETIZATION_MODE,
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H264_ATTR_KEY_SPROP_INTERLEAVING_DEPTH,
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H264_ATTR_KEY_SPROP_DEINT_BUF_REQ,
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H264_ATTR_KEY_DEINT_BUF_CAP,
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H264_ATTR_KEY_SPROP_INIT_BUF_TIME,
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H264_ATTR_KEY_SPROP_MAX_DON_DIFF,
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H264_ATTR_KEY_MAX_RCMD_NALU_SIZE,
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H264_ATTR_KEY_LEVEL_ASYMMETRY_ALLOWED,
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H264_ATTR_KEY_SPS_LEN,
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H264_ATTR_KEY_PPS_LEN,
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H264_ATTR_KEY_SPS,
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H264_ATTR_KEY_PPS = H264_ATTR_KEY_SPS + H264_MAX_SPS_PPS_SIZE,
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H264_ATTR_KEY_END = H264_ATTR_KEY_PPS + H264_MAX_SPS_PPS_SIZE,
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};
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static enum ast_format_cmp_res h264_format_attr_cmp(const struct ast_format_attr *fattr1, const struct ast_format_attr *fattr2)
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{
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unsigned int idc1 = fattr1->format_attr[H264_ATTR_KEY_PROFILE_IDC] ? fattr1->format_attr[H264_ATTR_KEY_PROFILE_IDC] : 0x42;
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unsigned int idc2 = fattr2->format_attr[H264_ATTR_KEY_PROFILE_IDC] ? fattr2->format_attr[H264_ATTR_KEY_PROFILE_IDC] : 0x42;
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/* We are as permissive as possible to ensure the maximum number of calls succeed */
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return (idc1 == idc2) ? AST_FORMAT_CMP_EQUAL : AST_FORMAT_CMP_NOT_EQUAL;
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}
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static int h264_format_attr_get_joint(const struct ast_format_attr *fattr1, const struct ast_format_attr *fattr2, struct ast_format_attr *result)
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{
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int i;
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for (i = H264_ATTR_KEY_PROFILE_IDC; i < H264_ATTR_KEY_END; i++) {
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result->format_attr[i] = fattr1->format_attr[i] ? fattr1->format_attr[i] : fattr2->format_attr[i];
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}
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return 0;
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}
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static int h264_format_attr_sdp_parse(struct ast_format_attr *format_attr, const char *attributes)
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{
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char *attribs = ast_strdupa(attributes), *attrib;
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format_attr->format_attr[H264_ATTR_KEY_REDUNDANT_PIC_CAP] = H264_ATTR_KEY_UNSET;
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format_attr->format_attr[H264_ATTR_KEY_PARAMETER_ADD] = H264_ATTR_KEY_UNSET;
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format_attr->format_attr[H264_ATTR_KEY_PACKETIZATION_MODE] = H264_ATTR_KEY_UNSET;
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format_attr->format_attr[H264_ATTR_KEY_LEVEL_ASYMMETRY_ALLOWED] = H264_ATTR_KEY_UNSET;
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while ((attrib = strsep(&attribs, ";"))) {
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unsigned int val;
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unsigned long int val2;
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char sps[H264_MAX_SPS_PPS_SIZE], pps[H264_MAX_SPS_PPS_SIZE];
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if (sscanf(attrib, "profile-level-id=%lx", &val2) == 1) {
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format_attr->format_attr[H264_ATTR_KEY_PROFILE_IDC] = ((val2 >> 16) & 0xFF);
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format_attr->format_attr[H264_ATTR_KEY_PROFILE_IOP] = ((val2 >> 8) & 0xFF);
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format_attr->format_attr[H264_ATTR_KEY_LEVEL] = (val2 & 0xFF);
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} else if (sscanf(attrib, "sprop-parameter-sets=%[^','],%s", sps, pps) == 2) {
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unsigned char spsdecoded[H264_MAX_SPS_PPS_SIZE] = { 0, }, ppsdecoded[H264_MAX_SPS_PPS_SIZE] = { 0, };
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int i;
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ast_base64decode(spsdecoded, sps, sizeof(spsdecoded));
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ast_base64decode(ppsdecoded, pps, sizeof(ppsdecoded));
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format_attr->format_attr[H264_ATTR_KEY_SPS_LEN] = 0;
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format_attr->format_attr[H264_ATTR_KEY_PPS_LEN] = 0;
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for (i = 0; i < H264_MAX_SPS_PPS_SIZE; i++) {
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if (spsdecoded[i]) {
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format_attr->format_attr[H264_ATTR_KEY_SPS + i] = spsdecoded[i];
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format_attr->format_attr[H264_ATTR_KEY_SPS_LEN]++;
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}
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if (ppsdecoded[i]) {
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format_attr->format_attr[H264_ATTR_KEY_PPS + i] = ppsdecoded[i];
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format_attr->format_attr[H264_ATTR_KEY_PPS_LEN]++;
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}
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}
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} else if (sscanf(attrib, "max-mbps=%30u", &val) == 1) {
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format_attr->format_attr[H264_ATTR_KEY_MAX_MBPS] = val;
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} else if (sscanf(attrib, "max-fs=%30u", &val) == 1) {
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format_attr->format_attr[H264_ATTR_KEY_MAX_FS] = val;
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} else if (sscanf(attrib, "max-cpb=%30u", &val) == 1) {
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format_attr->format_attr[H264_ATTR_KEY_MAX_CPB] = val;
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} else if (sscanf(attrib, "max-dpb=%30u", &val) == 1) {
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format_attr->format_attr[H264_ATTR_KEY_MAX_DPB] = val;
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} else if (sscanf(attrib, "max-br=%30u", &val) == 1) {
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format_attr->format_attr[H264_ATTR_KEY_MAX_BR] = val;
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} else if (sscanf(attrib, "redundant-pic-cap=%30u", &val) == 1) {
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format_attr->format_attr[H264_ATTR_KEY_REDUNDANT_PIC_CAP] = val;
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} else if (sscanf(attrib, "parameter-add=%30u", &val) == 1) {
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format_attr->format_attr[H264_ATTR_KEY_PARAMETER_ADD] = val;
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} else if (sscanf(attrib, "packetization-mode=%30u", &val) == 1) {
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format_attr->format_attr[H264_ATTR_KEY_PACKETIZATION_MODE] = val;
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} else if (sscanf(attrib, "sprop-interleaving-depth=%30u", &val) == 1) {
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format_attr->format_attr[H264_ATTR_KEY_SPROP_INTERLEAVING_DEPTH] = val;
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} else if (sscanf(attrib, "sprop-deint-buf-req=%30u", &val) == 1) {
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format_attr->format_attr[H264_ATTR_KEY_SPROP_DEINT_BUF_REQ] = val;
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} else if (sscanf(attrib, "deint-buf-cap=%30u", &val) == 1) {
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format_attr->format_attr[H264_ATTR_KEY_DEINT_BUF_CAP] = val;
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} else if (sscanf(attrib, "sprop-init-buf-time=%30u", &val) == 1) {
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format_attr->format_attr[H264_ATTR_KEY_SPROP_INIT_BUF_TIME] = val;
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} else if (sscanf(attrib, "sprop-max-don-diff=%30u", &val) == 1) {
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format_attr->format_attr[H264_ATTR_KEY_SPROP_MAX_DON_DIFF] = val;
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} else if (sscanf(attrib, "max-rcmd-nalu-size=%30u", &val) == 1) {
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format_attr->format_attr[H264_ATTR_KEY_MAX_RCMD_NALU_SIZE] = val;
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} else if (sscanf(attrib, "level-asymmetry-allowed=%30u", &val) == 1) {
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format_attr->format_attr[H264_ATTR_KEY_LEVEL_ASYMMETRY_ALLOWED] = val;
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}
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}
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return 0;
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}
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/*! \brief Helper function which converts a key enum into a string value for SDP */
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static const char *h264_attr_key_to_str(enum h264_attr_keys key)
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{
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switch (key) {
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case H264_ATTR_KEY_MAX_MBPS:
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return "max-mbps";
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case H264_ATTR_KEY_MAX_FS:
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return "max-fs";
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case H264_ATTR_KEY_MAX_CPB:
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return "max-cpb";
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case H264_ATTR_KEY_MAX_DPB:
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return "max-dpb";
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case H264_ATTR_KEY_MAX_BR:
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return "max-br";
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case H264_ATTR_KEY_REDUNDANT_PIC_CAP:
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return "redundant-pic-cap";
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case H264_ATTR_KEY_PARAMETER_ADD:
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return "parameter-add";
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case H264_ATTR_KEY_PACKETIZATION_MODE:
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return "packetization-mode";
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case H264_ATTR_KEY_SPROP_INTERLEAVING_DEPTH:
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return "sprop-interleaving-depth";
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case H264_ATTR_KEY_SPROP_DEINT_BUF_REQ:
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return "sprop-deint-buf-req";
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case H264_ATTR_KEY_DEINT_BUF_CAP:
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return "deint-buf-cap";
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case H264_ATTR_KEY_SPROP_INIT_BUF_TIME:
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return "sprop-init-buf-time";
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case H264_ATTR_KEY_SPROP_MAX_DON_DIFF:
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return "sprop-max-don-diff";
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case H264_ATTR_KEY_MAX_RCMD_NALU_SIZE:
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return "max-rcmd-nalu-size";
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case H264_ATTR_KEY_LEVEL_ASYMMETRY_ALLOWED:
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return "level-asymmetry-allowed";
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default:
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return NULL;
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}
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return NULL;
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}
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/*! \brief Helper function which determines if the value of an attribute can be placed into the SDP */
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static int h264_attr_key_addable(const struct ast_format_attr *format_attr, enum h264_attr_keys key)
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{
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switch (key) {
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case H264_ATTR_KEY_REDUNDANT_PIC_CAP:
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case H264_ATTR_KEY_PARAMETER_ADD:
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case H264_ATTR_KEY_PACKETIZATION_MODE:
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case H264_ATTR_KEY_LEVEL_ASYMMETRY_ALLOWED:
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return (format_attr->format_attr[key] != H264_ATTR_KEY_UNSET) ? 1 : 0;
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default:
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return format_attr->format_attr[key] ? 1 : 0;
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}
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return 1;
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}
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static void h264_format_attr_sdp_generate(const struct ast_format_attr *format_attr, unsigned int payload, struct ast_str **str)
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{
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int i, added = 0;
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for (i = H264_ATTR_KEY_PROFILE_IDC; i < H264_ATTR_KEY_END; i++) {
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const char *name;
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if (i == H264_ATTR_KEY_SPS && format_attr->format_attr[H264_ATTR_KEY_SPS] && format_attr->format_attr[H264_ATTR_KEY_PPS]) {
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unsigned char spsdecoded[H264_MAX_SPS_PPS_SIZE] = { 0, }, ppsdecoded[H264_MAX_SPS_PPS_SIZE] = { 0, };
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int pos;
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char sps[H264_MAX_SPS_PPS_SIZE], pps[H264_MAX_SPS_PPS_SIZE];
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for (pos = 0; pos < H264_MAX_SPS_PPS_SIZE; pos++) {
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spsdecoded[pos] = format_attr->format_attr[H264_ATTR_KEY_SPS + pos];
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ppsdecoded[pos] = format_attr->format_attr[H264_ATTR_KEY_PPS + pos];
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}
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ast_base64encode(sps, spsdecoded, format_attr->format_attr[H264_ATTR_KEY_SPS_LEN], H264_MAX_SPS_PPS_SIZE);
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ast_base64encode(pps, ppsdecoded, format_attr->format_attr[H264_ATTR_KEY_PPS_LEN], H264_MAX_SPS_PPS_SIZE);
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if (!added) {
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ast_str_append(str, 0, "a=fmtp:%d sprop-parameter-sets=%s,%s", payload, sps, pps);
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added = 1;
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} else {
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ast_str_append(str, 0, ";sprop-parameter-sets=%s,%s", sps, pps);
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}
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} else if (i == H264_ATTR_KEY_PROFILE_IDC && format_attr->format_attr[H264_ATTR_KEY_PROFILE_IDC] &&
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format_attr->format_attr[H264_ATTR_KEY_PROFILE_IOP] && format_attr->format_attr[H264_ATTR_KEY_LEVEL]) {
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if (!added) {
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ast_str_append(str, 0, "a=fmtp:%d profile-level-id=%X%X%X", payload, format_attr->format_attr[H264_ATTR_KEY_PROFILE_IDC],
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format_attr->format_attr[H264_ATTR_KEY_PROFILE_IOP], format_attr->format_attr[H264_ATTR_KEY_LEVEL]);
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added = 1;
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} else {
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ast_str_append(str, 0, ";profile-level-id=%X%X%X", format_attr->format_attr[H264_ATTR_KEY_PROFILE_IDC],
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format_attr->format_attr[H264_ATTR_KEY_PROFILE_IOP], format_attr->format_attr[H264_ATTR_KEY_LEVEL]);
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}
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} else if ((name = h264_attr_key_to_str(i)) && h264_attr_key_addable(format_attr, i)) {
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if (!added) {
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ast_str_append(str, 0, "a=fmtp:%d %s=%u", payload, name, format_attr->format_attr[i]);
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added = 1;
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} else {
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ast_str_append(str, 0, ";%s=%u", name, format_attr->format_attr[i]);
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}
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}
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}
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if (added) {
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ast_str_append(str, 0, "\r\n");
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}
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return;
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}
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static struct ast_format_attr_interface h264_format_attr_interface = {
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.id = AST_FORMAT_H264,
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.format_attr_cmp = h264_format_attr_cmp,
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.format_attr_get_joint = h264_format_attr_get_joint,
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.format_attr_sdp_parse = h264_format_attr_sdp_parse,
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.format_attr_sdp_generate = h264_format_attr_sdp_generate,
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};
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static int unload_module(void)
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{
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ast_format_attr_unreg_interface(&h264_format_attr_interface);
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return 0;
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}
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static int load_module(void)
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{
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if (ast_format_attr_reg_interface(&h264_format_attr_interface)) {
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return AST_MODULE_LOAD_DECLINE;
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}
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return AST_MODULE_LOAD_SUCCESS;
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}
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AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "H.264 Format Attribute Module",
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.load = load_module,
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.unload = unload_module,
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.load_pri = AST_MODPRI_DEFAULT,
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);
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