296 lines
11 KiB
C
296 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.263 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.263 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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enum h263_attr_keys {
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H263_ATTR_KEY_SQCIF, /*!< Minimum picture interval for SQCIF resolution */
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H263_ATTR_KEY_QCIF, /*!< Minimum picture interval for QCIF resolution */
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H263_ATTR_KEY_CIF, /*!< Minimum picture interval for CIF resolution */
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H263_ATTR_KEY_CIF4, /*!< Minimum picture interval for CIF4 resolution */
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H263_ATTR_KEY_CIF16, /*!< Minimum picture interval for CIF16 resolution */
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H263_ATTR_KEY_VGA, /*!< Minimum picture interval for VGA resolution */
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H263_ATTR_KEY_CUSTOM_XMAX, /*!< Custom resolution (Xmax) */
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H263_ATTR_KEY_CUSTOM_YMAX, /*!< Custom resolution (Ymax) */
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H263_ATTR_KEY_CUSTOM_MPI, /*!< Custom resolution (MPI) */
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H263_ATTR_KEY_F, /*!< F annex support */
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H263_ATTR_KEY_I, /*!< I annex support */
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H263_ATTR_KEY_J, /*!< J annex support */
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H263_ATTR_KEY_T, /*!< T annex support */
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H263_ATTR_KEY_K, /*!< K annex support */
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H263_ATTR_KEY_N, /*!< N annex support */
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H263_ATTR_KEY_P_SUB1, /*!< Reference picture resampling (sub mode 1) */
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H263_ATTR_KEY_P_SUB2, /*!< Reference picture resampling (sub mode 2) */
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H263_ATTR_KEY_P_SUB3, /*!< Reference picture resampling (sub mode 3) */
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H263_ATTR_KEY_P_SUB4, /*!< Reference picture resampling (sub mode 4) */
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H263_ATTR_KEY_PAR_WIDTH, /*!< Pixel aspect ratio (width) */
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H263_ATTR_KEY_PAR_HEIGHT, /*!< Pixel aspect ratio (height) */
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H263_ATTR_KEY_BPP, /*!< Bits per picture maximum */
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H263_ATTR_KEY_HRD, /*!< Hypothetical reference decoder status */
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H263_ATTR_KEY_END, /*!< End terminator for list */
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};
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static int h263_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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/* These are all receiver options so we just copy over what they sent */
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for (i = H263_ATTR_KEY_SQCIF; i < H263_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 h263_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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while ((attrib = strsep(&attribs, ";"))) {
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unsigned int val, val2 = 0, val3 = 0, val4 = 0;
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if (sscanf(attrib, "SQCIF=%30u", &val) == 1) {
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format_attr->format_attr[H263_ATTR_KEY_SQCIF] = val;
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} else if (sscanf(attrib, "QCIF=%30u", &val) == 1) {
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format_attr->format_attr[H263_ATTR_KEY_QCIF] = val;
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} else if (sscanf(attrib, "CIF=%30u", &val) == 1) {
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format_attr->format_attr[H263_ATTR_KEY_CIF] = val;
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} else if (sscanf(attrib, "CIF4=%30u", &val) == 1) {
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format_attr->format_attr[H263_ATTR_KEY_CIF4] = val;
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} else if (sscanf(attrib, "CIF16=%30u", &val) == 1) {
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format_attr->format_attr[H263_ATTR_KEY_CIF16] = val;
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} else if (sscanf(attrib, "VGA=%30u", &val) == 1) {
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format_attr->format_attr[H263_ATTR_KEY_VGA] = val;
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} else if (sscanf(attrib, "CUSTOM=%30u,%30u,%30u", &val, &val2, &val3) == 3) {
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format_attr->format_attr[H263_ATTR_KEY_CUSTOM_XMAX] = val;
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format_attr->format_attr[H263_ATTR_KEY_CUSTOM_YMAX] = val2;
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format_attr->format_attr[H263_ATTR_KEY_CUSTOM_MPI] = val3;
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} else if (sscanf(attrib, "F=%30u", &val) == 1) {
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format_attr->format_attr[H263_ATTR_KEY_F] = val;
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} else if (sscanf(attrib, "I=%30u", &val) == 1) {
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format_attr->format_attr[H263_ATTR_KEY_I] = val;
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} else if (sscanf(attrib, "J=%30u", &val) == 1) {
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format_attr->format_attr[H263_ATTR_KEY_J] = val;
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} else if (sscanf(attrib, "T=%30u", &val) == 1) {
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format_attr->format_attr[H263_ATTR_KEY_T] = val;
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} else if (sscanf(attrib, "K=%30u", &val) == 1) {
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format_attr->format_attr[H263_ATTR_KEY_K] = val;
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} else if (sscanf(attrib, "N=%30u", &val) == 1) {
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format_attr->format_attr[H263_ATTR_KEY_N] = val;
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} else if (sscanf(attrib, "PAR=%30u:%30u", &val, &val2) == 2) {
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format_attr->format_attr[H263_ATTR_KEY_PAR_WIDTH] = val;
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format_attr->format_attr[H263_ATTR_KEY_PAR_HEIGHT] = val2;
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} else if (sscanf(attrib, "BPP=%30u", &val) == 1) {
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format_attr->format_attr[H263_ATTR_KEY_BPP] = val;
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} else if (sscanf(attrib, "HRD=%30u", &val) == 1) {
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format_attr->format_attr[H263_ATTR_KEY_HRD] = val;
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} else if (sscanf(attrib, "P=%30u,%30u,%30u,%30u", &val, &val2, &val3, &val4) > 0) {
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format_attr->format_attr[H263_ATTR_KEY_P_SUB1] = val;
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format_attr->format_attr[H263_ATTR_KEY_P_SUB2] = val2;
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format_attr->format_attr[H263_ATTR_KEY_P_SUB3] = val3;
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format_attr->format_attr[H263_ATTR_KEY_P_SUB4] = val4;
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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 *h263_attr_key_to_str(enum h263_attr_keys key, const struct ast_format_attr *format_attr)
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{
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switch (key) {
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case H263_ATTR_KEY_SQCIF:
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return format_attr->format_attr[key] ? "SQCIF" : NULL;
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case H263_ATTR_KEY_QCIF:
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return format_attr->format_attr[key] ? "QCIF" : NULL;
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case H263_ATTR_KEY_CIF:
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return format_attr->format_attr[key] ? "CIF" : NULL;
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case H263_ATTR_KEY_CIF4:
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return format_attr->format_attr[key] ? "CIF4" : NULL;
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case H263_ATTR_KEY_CIF16:
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return format_attr->format_attr[key] ? "CIF16" : NULL;
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case H263_ATTR_KEY_VGA:
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return format_attr->format_attr[key] ? "VGA" : NULL;
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case H263_ATTR_KEY_F:
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return "F";
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case H263_ATTR_KEY_I:
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return "I";
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case H263_ATTR_KEY_J:
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return "J";
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case H263_ATTR_KEY_T:
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return "T";
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case H263_ATTR_KEY_K:
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return "K";
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case H263_ATTR_KEY_N:
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return "N";
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case H263_ATTR_KEY_BPP:
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return "BPP";
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case H263_ATTR_KEY_HRD:
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return "HRD";
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case H263_ATTR_KEY_CUSTOM_XMAX:
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case H263_ATTR_KEY_CUSTOM_YMAX:
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case H263_ATTR_KEY_CUSTOM_MPI:
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case H263_ATTR_KEY_P_SUB1:
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case H263_ATTR_KEY_P_SUB2:
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case H263_ATTR_KEY_P_SUB3:
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case H263_ATTR_KEY_P_SUB4:
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case H263_ATTR_KEY_PAR_WIDTH:
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case H263_ATTR_KEY_PAR_HEIGHT:
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case H263_ATTR_KEY_END:
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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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static void h263_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 = H263_ATTR_KEY_SQCIF; i < H263_ATTR_KEY_END; i++) {
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const char *name;
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if (i == H263_ATTR_KEY_CUSTOM_XMAX) {
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if (!format_attr->format_attr[H263_ATTR_KEY_CUSTOM_XMAX] || !format_attr->format_attr[H263_ATTR_KEY_CUSTOM_YMAX] ||
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!format_attr->format_attr[H263_ATTR_KEY_CUSTOM_MPI]) {
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continue;
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}
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if (!added) {
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ast_str_append(str, 0, "a=fmtp:%d CUSTOM=%u,%u,%u", payload, format_attr->format_attr[H263_ATTR_KEY_CUSTOM_XMAX],
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format_attr->format_attr[H263_ATTR_KEY_CUSTOM_YMAX], format_attr->format_attr[H263_ATTR_KEY_CUSTOM_MPI]);
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added = 1;
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} else {
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ast_str_append(str, 0, ";CUSTOM=%u,%u,%u", format_attr->format_attr[H263_ATTR_KEY_CUSTOM_XMAX],
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format_attr->format_attr[H263_ATTR_KEY_CUSTOM_YMAX], format_attr->format_attr[H263_ATTR_KEY_CUSTOM_MPI]);
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}
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} else if (i == H263_ATTR_KEY_PAR_WIDTH) {
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if (!format_attr->format_attr[H263_ATTR_KEY_PAR_WIDTH] || !format_attr->format_attr[H263_ATTR_KEY_PAR_HEIGHT]) {
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continue;
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}
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if (!added) {
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ast_str_append(str, 0, "a=fmtp:%d PAR=%u:%u", payload, format_attr->format_attr[H263_ATTR_KEY_PAR_WIDTH],
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format_attr->format_attr[H263_ATTR_KEY_PAR_HEIGHT]);
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added = 1;
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} else {
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ast_str_append(str, 0, ";PAR=%u:%u", format_attr->format_attr[H263_ATTR_KEY_PAR_WIDTH],
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format_attr->format_attr[H263_ATTR_KEY_PAR_HEIGHT]);
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}
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} else if (i == H263_ATTR_KEY_P_SUB1) {
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if (!format_attr->format_attr[H263_ATTR_KEY_P_SUB1]) {
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continue;
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}
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if (!added) {
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ast_str_append(str, 0, "a=fmtp:%d P=%u", payload, format_attr->format_attr[H263_ATTR_KEY_P_SUB1]);
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added = 1;
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} else {
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ast_str_append(str, 0, ";P=%u", format_attr->format_attr[H263_ATTR_KEY_P_SUB1]);
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}
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if (format_attr->format_attr[H263_ATTR_KEY_P_SUB2]) {
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ast_str_append(str, 0, ",%u", format_attr->format_attr[H263_ATTR_KEY_P_SUB2]);
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}
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if (format_attr->format_attr[H263_ATTR_KEY_P_SUB3]) {
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ast_str_append(str, 0, ",%u", format_attr->format_attr[H263_ATTR_KEY_P_SUB3]);
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}
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if (format_attr->format_attr[H263_ATTR_KEY_P_SUB4]) {
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ast_str_append(str, 0, ",%u", format_attr->format_attr[H263_ATTR_KEY_P_SUB4]);
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}
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} else if ((name = h263_attr_key_to_str(i, format_attr))) {
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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 h263_format_attr_interface = {
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.id = AST_FORMAT_H263,
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.format_attr_get_joint = h263_format_attr_get_joint,
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.format_attr_sdp_parse = h263_format_attr_sdp_parse,
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.format_attr_sdp_generate = h263_format_attr_sdp_generate,
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};
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static struct ast_format_attr_interface h263p_format_attr_interface = {
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.id = AST_FORMAT_H263_PLUS,
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.format_attr_get_joint = h263_format_attr_get_joint,
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.format_attr_sdp_parse = h263_format_attr_sdp_parse,
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.format_attr_sdp_generate = h263_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(&h263_format_attr_interface);
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ast_format_attr_unreg_interface(&h263p_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(&h263_format_attr_interface)) {
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return AST_MODULE_LOAD_DECLINE;
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}
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if (ast_format_attr_reg_interface(&h263p_format_attr_interface)) {
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ast_format_attr_unreg_interface(&h263_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.263 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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