H.263 Format Attribute Module. More...

#include "asterisk.h"
#include <ctype.h>
#include "asterisk/module.h"
#include "asterisk/format.h"
#include "asterisk/strings.h"
#include "asterisk/utils.h"

Include dependency graph for res_format_attr_h263.c:

Go to the source code of this file.

Data Structures
struct	h263_attr

Macros
#define	APPEND_IF_NONZERO(field, str, name)

#define	APPEND_IF_NOT_H263_UNSET(field, str, name)

#define	DETERMINE_JOINT(joint, attr1, attr2, field) (joint->field = (attr1 && attr1->field) ? attr1->field : (attr2 && attr2->field) ? attr2->field : 0)

#define	H263_ATTR_KEY_UNSET UINT8_MAX
	Value that indicates an attribute is actually unset. More...

Functions
static void	__reg_module (void)

static void	__unreg_module (void)

struct ast_module *	AST_MODULE_SELF_SYM (void)

static int	h263_clone (const struct ast_format src, struct ast_format dst)

static enum ast_format_cmp_res	h263_cmp (const struct ast_format format1, const struct ast_format format2)

static void	h263_destroy (struct ast_format *format)

static void	h263_generate_sdp_fmtp (const struct ast_format format, unsigned int payload, struct ast_str *str)

static struct ast_format *	h263_getjoint (const struct ast_format format1, const struct ast_format format2)

static struct ast_format *	h263_parse_sdp_fmtp (const struct ast_format format, const char attributes)

static int	load_module (void)

static int	unload_module (void)

Variables
static struct ast_module_info	__mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_DEFAULT , .description = "H.263 Format Attribute Module" , .key = "This paragraph is copyright (c) 2006 by Digium, Inc. \In order for your module to load, it must return this \key via a function called \"key\". Any code which \includes this paragraph must be licensed under the GNU \General Public License version 2 or later (at your \option). In addition to Digium's general reservations \of rights, Digium expressly reserves the right to \allow other parties to license this paragraph under \different terms. Any use of Digium, Inc. trademarks or \logos (including \"Asterisk\" or \"Digium\") without \express written permission of Digium, Inc. is prohibited.\n" , .buildopt_sum = "30ef0c93b36035ec78c9cfd712d36d9b" , .support_level = AST_MODULE_SUPPORT_CORE, .load = load_module, .unload = unload_module, }

static const struct ast_module_info *	ast_module_info = &__mod_info

static struct ast_format_interface	h263_interface

Detailed Description

H.263 Format Attribute Module.

Author

Joshua Colp <[email protected]>

This is a format attribute module for the H.263 codec.

Definition in file res_format_attr_h263.c.

Macro Definition Documentation

◆ APPEND_IF_NONZERO

#define APPEND_IF_NONZERO	(	field,
		str,
		name
	)

Definition at line 277 of file res_format_attr_h263.c.

Referenced by h263_generate_sdp_fmtp().

◆ APPEND_IF_NOT_H263_UNSET

#define APPEND_IF_NOT_H263_UNSET	(	field,
		str,
		name
	)

Definition at line 266 of file res_format_attr_h263.c.

Referenced by h263_generate_sdp_fmtp().

◆ DETERMINE_JOINT

#define DETERMINE_JOINT	(	joint,
		attr1,
		attr2,
		field
	)	(joint->field = (attr1 && attr1->field) ? attr1->field : (attr2 && attr2->field) ? attr2->field : 0)

Definition at line 117 of file res_format_attr_h263.c.

Referenced by h263_getjoint().

◆ H263_ATTR_KEY_UNSET

#define H263_ATTR_KEY_UNSET UINT8_MAX

Value that indicates an attribute is actually unset.

Definition at line 44 of file res_format_attr_h263.c.

Referenced by h263_generate_sdp_fmtp(), and h263_parse_sdp_fmtp().

Function Documentation

◆ __reg_module()

static void __reg_module ( void )

static

Definition at line 399 of file res_format_attr_h263.c.

◆ __unreg_module()

static void __unreg_module ( void )

static

Definition at line 399 of file res_format_attr_h263.c.

◆ AST_MODULE_SELF_SYM()

struct ast_module* AST_MODULE_SELF_SYM ( void )

Definition at line 399 of file res_format_attr_h263.c.

◆ h263_clone()

static int h263_clone	(	const struct ast_format *	src,
		struct ast_format *	dst
	)

static

Definition at line 88 of file res_format_attr_h263.c.

References ast_calloc, ast_format_get_attribute_data(), and ast_format_set_attribute_data().

 {
  struct h263_attr *original = ast_format_get_attribute_data(src);
  struct h263_attr *attr = ast_calloc(1, sizeof(*attr));
 
  if (!attr) {
  return -1;
  }
 
  if (original) {
  *attr = *original;
  }
 
  ast_format_set_attribute_data(dst, attr);
 
  return 0;
 }

◆ h263_cmp()

static enum ast_format_cmp_res h263_cmp	(	const struct ast_format *	format1,
		const struct ast_format *	format2
	)

static

Definition at line 106 of file res_format_attr_h263.c.

References AST_FORMAT_CMP_EQUAL, AST_FORMAT_CMP_NOT_EQUAL, and ast_format_get_attribute_data().

 {
  struct h263_attr *attr1 = ast_format_get_attribute_data(format1);
  struct h263_attr *attr2 = ast_format_get_attribute_data(format2);
 
  if (!attr1 || !attr2 || (attr1 && attr2 && !memcmp(attr1, attr2, sizeof(*attr1)))) {
  return AST_FORMAT_CMP_EQUAL;
  }
  return AST_FORMAT_CMP_NOT_EQUAL;
 }

◆ h263_destroy()

static void h263_destroy ( struct ast_format * format )

static

Definition at line 81 of file res_format_attr_h263.c.

References ast_format_get_attribute_data(), and ast_free.

 {
  struct h263_attr *attr = ast_format_get_attribute_data(format);
 
  ast_free(attr);
 }

◆ h263_generate_sdp_fmtp()

static void h263_generate_sdp_fmtp	(	const struct ast_format *	format,
		unsigned int	payload,
		struct ast_str **	str
	)

static

Definition at line 288 of file res_format_attr_h263.c.

References APPEND_IF_NONZERO, APPEND_IF_NOT_H263_UNSET, ast_format_get_attribute_data(), ast_str_append(), h263_attr::BPP, h263_attr::CIF, h263_attr::CIF16, h263_attr::CIF4, h263_attr::CPCF, h263_attr::CPCF_2, h263_attr::CPCF_3, h263_attr::CPCF_4, h263_attr::CPCF_5, h263_attr::CPCF_6, h263_attr::CPCF_7, h263_attr::CPCF_MPI, h263_attr::CUSTOM_MPI, h263_attr::CUSTOM_XMAX, h263_attr::CUSTOM_YMAX, h263_attr::F, H263_ATTR_KEY_UNSET, h263_attr::HRD, h263_attr::I, h263_attr::J, h263_attr::K, h263_attr::MaxBR, h263_attr::N, h263_attr::P_SUB1, h263_attr::P_SUB2, h263_attr::P_SUB3, h263_attr::P_SUB4, h263_attr::PAR_HEIGHT, h263_attr::PAR_WIDTH, h263_attr::QCIF, h263_attr::SQCIF, h263_attr::T, and h263_attr::VGA.

 {
  struct h263_attr *attr = ast_format_get_attribute_data(format);
  int added = 0;
 
  if (!attr) {
  return;
  }
 
  if (attr->CPCF) {
  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, "CPCF=%u,%u,%u,%u,%u,%u,%u,%u", attr->CPCF, attr->CPCF_2, attr->CPCF_3,
  attr->CPCF_4, attr->CPCF_5, attr->CPCF_6, attr->CPCF_7, attr->CPCF_MPI);
  }
 
  APPEND_IF_NONZERO(attr->CIF16, str, "CIF16");
  APPEND_IF_NONZERO(attr->CIF4, str, "CIF4");
  APPEND_IF_NONZERO(attr->VGA, str, "VGA");
  APPEND_IF_NONZERO(attr->CIF, str, "CIF");
  APPEND_IF_NONZERO(attr->QCIF, str, "QCIF");
  APPEND_IF_NONZERO(attr->SQCIF, str, "SQCIF");
 
  if (attr->CUSTOM_XMAX && attr->CUSTOM_YMAX && attr->CUSTOM_MPI) {
  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, "CUSTOM=%u,%u,%u", attr->CUSTOM_XMAX, attr->CUSTOM_YMAX, attr->CUSTOM_MPI);
  }
 
  APPEND_IF_NONZERO(attr->F, str, "F");
  APPEND_IF_NONZERO(attr->I, str, "I");
  APPEND_IF_NONZERO(attr->J, str, "J");
  APPEND_IF_NONZERO(attr->T, str, "T");
  APPEND_IF_NONZERO(attr->K, str, "K");
  APPEND_IF_NONZERO(attr->N, str, "N");
 
  if (attr->P_SUB1) {
  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, "P=%u", attr->P_SUB1);
  if (attr->P_SUB2) {
  ast_str_append(str, 0, ",%u", attr->P_SUB2);
  }
  if (attr->P_SUB3) {
  ast_str_append(str, 0, ",%u", attr->P_SUB3);
  }
  if (attr->P_SUB4) {
  ast_str_append(str, 0, ",%u", attr->P_SUB4);
  }
  }
 
  if (attr->PAR_WIDTH != H263_ATTR_KEY_UNSET && attr->PAR_HEIGHT != H263_ATTR_KEY_UNSET) {
  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, "PAR=%u:%u", attr->PAR_WIDTH, attr->PAR_HEIGHT);
  }
 
  APPEND_IF_NOT_H263_UNSET(attr->BPP, str, "BPP");
 
  APPEND_IF_NONZERO(attr->HRD, str, "HRD");
 
  APPEND_IF_NOT_H263_UNSET(attr->MaxBR, str, "MaxBR");
 
  ast_str_append(str, 0, "\r\n");
 
  return;
 }

◆ h263_getjoint()

static struct ast_format* h263_getjoint	(	const struct ast_format *	format1,
		const struct ast_format *	format2
	)

static

Definition at line 119 of file res_format_attr_h263.c.

References ast_format_clone(), ast_format_get_attribute_data(), h263_attr::BPP, h263_attr::CIF, h263_attr::CIF16, h263_attr::CIF4, h263_attr::CPCF, h263_attr::CPCF_2, h263_attr::CPCF_3, h263_attr::CPCF_4, h263_attr::CPCF_5, h263_attr::CPCF_6, h263_attr::CPCF_7, h263_attr::CPCF_MPI, h263_attr::CUSTOM_MPI, h263_attr::CUSTOM_XMAX, h263_attr::CUSTOM_YMAX, DETERMINE_JOINT, h263_attr::F, h263_attr::HRD, h263_attr::I, h263_attr::J, h263_attr::K, h263_attr::MaxBR, h263_attr::N, NULL, h263_attr::P_SUB1, h263_attr::P_SUB2, h263_attr::P_SUB3, h263_attr::P_SUB4, h263_attr::PAR_HEIGHT, h263_attr::PAR_WIDTH, h263_attr::QCIF, h263_attr::SQCIF, h263_attr::T, and h263_attr::VGA.

 {
  struct ast_format *cloned;
  struct h263_attr *attr, *attr1, *attr2;
 
  cloned = ast_format_clone(format1);
  if (!cloned) {
  return NULL;
  }
  attr = ast_format_get_attribute_data(cloned);
 
  attr1 = ast_format_get_attribute_data(format1);
  attr2 = ast_format_get_attribute_data(format2);
 
  DETERMINE_JOINT(attr, attr1, attr2, SQCIF);
  DETERMINE_JOINT(attr, attr1, attr2, QCIF);
  DETERMINE_JOINT(attr, attr1, attr2, CIF);
  DETERMINE_JOINT(attr, attr1, attr2, CIF4);
  DETERMINE_JOINT(attr, attr1, attr2, CIF16);
  DETERMINE_JOINT(attr, attr1, attr2, VGA);
  DETERMINE_JOINT(attr, attr1, attr2, CUSTOM_XMAX);
  DETERMINE_JOINT(attr, attr1, attr2, CUSTOM_YMAX);
  DETERMINE_JOINT(attr, attr1, attr2, CUSTOM_MPI);
  DETERMINE_JOINT(attr, attr1, attr2, CPCF);
  DETERMINE_JOINT(attr, attr1, attr2, CPCF_2);
  DETERMINE_JOINT(attr, attr1, attr2, CPCF_3);
  DETERMINE_JOINT(attr, attr1, attr2, CPCF_4);
  DETERMINE_JOINT(attr, attr1, attr2, CPCF_5);
  DETERMINE_JOINT(attr, attr1, attr2, CPCF_6);
  DETERMINE_JOINT(attr, attr1, attr2, CPCF_7);
  DETERMINE_JOINT(attr, attr1, attr2, CPCF_MPI);
  DETERMINE_JOINT(attr, attr1, attr2, F);
  DETERMINE_JOINT(attr, attr1, attr2, I);
  DETERMINE_JOINT(attr, attr1, attr2, J);
  DETERMINE_JOINT(attr, attr1, attr2, T);
  DETERMINE_JOINT(attr, attr1, attr2, K);
  DETERMINE_JOINT(attr, attr1, attr2, N);
  DETERMINE_JOINT(attr, attr1, attr2, P_SUB1);
  DETERMINE_JOINT(attr, attr1, attr2, P_SUB2);
  DETERMINE_JOINT(attr, attr1, attr2, P_SUB3);
  DETERMINE_JOINT(attr, attr1, attr2, P_SUB4);
  DETERMINE_JOINT(attr, attr1, attr2, PAR_WIDTH);
  DETERMINE_JOINT(attr, attr1, attr2, PAR_HEIGHT);
  DETERMINE_JOINT(attr, attr1, attr2, BPP);
  DETERMINE_JOINT(attr, attr1, attr2, HRD);
  DETERMINE_JOINT(attr, attr1, attr2, MaxBR);
 
  return cloned;
 }

◆ h263_parse_sdp_fmtp()

static struct ast_format* h263_parse_sdp_fmtp	(	const struct ast_format *	format,
		const char *	attributes
	)

static

Definition at line 169 of file res_format_attr_h263.c.

References ast_format_clone(), ast_format_get_attribute_data(), ast_strdupa, ast_strip(), h263_attr::BPP, h263_attr::CIF, h263_attr::CIF16, h263_attr::CIF4, h263_attr::CPCF, h263_attr::CPCF_2, h263_attr::CPCF_3, h263_attr::CPCF_4, h263_attr::CPCF_5, h263_attr::CPCF_6, h263_attr::CPCF_7, h263_attr::CPCF_MPI, h263_attr::CUSTOM_MPI, h263_attr::CUSTOM_XMAX, h263_attr::CUSTOM_YMAX, h263_attr::F, H263_ATTR_KEY_UNSET, h263_attr::HRD, h263_attr::I, h263_attr::J, h263_attr::K, h263_attr::MaxBR, h263_attr::N, NULL, h263_attr::P_SUB1, h263_attr::P_SUB2, h263_attr::P_SUB3, h263_attr::P_SUB4, h263_attr::PAR_HEIGHT, h263_attr::PAR_WIDTH, h263_attr::QCIF, h263_attr::SQCIF, strsep(), h263_attr::T, and h263_attr::VGA.

 {
  char *attribs = ast_strdupa(attributes), *attrib;
  struct ast_format *cloned;
  struct h263_attr *attr;
 
  cloned = ast_format_clone(format);
  if (!cloned) {
  return NULL;
  }
  attr = ast_format_get_attribute_data(cloned);
 
  /* upper-case everything, so we are case-insensitive */
  for (attrib = attribs; *attrib; ++attrib) {
  *attrib = toupper(*attrib);
  } /* based on channels/chan_sip.c:process_a_sdp_image() */
 
  attr->BPP = H263_ATTR_KEY_UNSET;
  attr->MaxBR = H263_ATTR_KEY_UNSET;
  attr->PAR_WIDTH = H263_ATTR_KEY_UNSET;
  attr->PAR_HEIGHT = H263_ATTR_KEY_UNSET;
 
  while ((attrib = strsep(&attribs, ";"))) {
  unsigned int val, val2 = 0, val3 = 0, val4 = 0, val5 = 0, val6 = 0, val7 = 0, val8 = 0;
 
  attrib = ast_strip(attrib);
 
  if (sscanf(attrib, "SQCIF=%30u", &val) == 1) {
  attr->SQCIF = val;
  } else if (strcmp(attrib, "SQCIF") == 0) {
  attr->SQCIF = 1;
  } else if (sscanf(attrib, "QCIF=%30u", &val) == 1) {
  attr->QCIF = val;
  } else if (strcmp(attrib, "QCIF") == 0) {
  attr->QCIF = 1;
  } else if (sscanf(attrib, "CIF=%30u", &val) == 1) {
  attr->CIF = val;
  } else if (strcmp(attrib, "CIF") == 0) {
  attr->CIF = 1;
  } else if (sscanf(attrib, "CIF4=%30u", &val) == 1) {
  attr->CIF4 = val;
  } else if (strcmp(attrib, "CIF4") == 0) {
  attr->CIF4 = 1;
  } else if (sscanf(attrib, "CIF16=%30u", &val) == 1) {
  attr->CIF16 = val;
  } else if (strcmp(attrib, "CIF16") == 0) {
  attr->CIF16 = 1;
  } else if (sscanf(attrib, "VGA=%30u", &val) == 1) {
  attr->VGA = val;
  } else if (strcmp(attrib, "VGA") == 0) {
  attr->VGA = 1;
  } else if (sscanf(attrib, "CUSTOM=%30u,%30u,%30u", &val, &val2, &val3) == 3) {
  attr->CUSTOM_XMAX = val;
  attr->CUSTOM_YMAX = val2;
  attr->CUSTOM_MPI = val3;
  } else if (sscanf(attrib, "CPCF=%30u,%30u,%30u,%30u,%30u,%30u,%30u,%30u",
  &val, &val2, &val3, &val4, &val5, &val6, &val7, &val8) == 8) {
  attr->CPCF = val;
  attr->CPCF_2 = val2;
  attr->CPCF_3 = val3;
  attr->CPCF_4 = val4;
  attr->CPCF_5 = val5;
  attr->CPCF_6 = val6;
  attr->CPCF_7 = val7;
  attr->CPCF_MPI = val8;
  } else if (sscanf(attrib, "F=%30u", &val) == 1) {
  attr->F = val;
  } else if (sscanf(attrib, "I=%30u", &val) == 1) {
  attr->I = val;
  } else if (sscanf(attrib, "J=%30u", &val) == 1) {
  attr->J = val;
  } else if (sscanf(attrib, "T=%30u", &val) == 1) {
  attr->T = val;
  } else if (sscanf(attrib, "K=%30u", &val) == 1) {
  attr->K = val;
  } else if (sscanf(attrib, "N=%30u", &val) == 1) {
  attr->N = val;
  } else if (sscanf(attrib, "PAR=%30u:%30u", &val, &val2) == 2) {
  attr->PAR_WIDTH = val;
  attr->PAR_HEIGHT = val2;
  } else if (sscanf(attrib, "BPP=%30u", &val) == 1) {
  attr->BPP = val;
  } else if (sscanf(attrib, "HRD=%30u", &val) == 1) {
  attr->HRD = val;
  } else if (sscanf(attrib, "P=%30u,%30u,%30u,%30u", &val, &val2, &val3, &val4) > 0) {
  attr->P_SUB1 = val;
  attr->P_SUB2 = val2;
  attr->P_SUB3 = val3;
  attr->P_SUB4 = val4;
  } else if (sscanf(attrib, "MAXBR=%30u", &val) == 1) {
  attr->MaxBR = val;
  }
  }
 
  return cloned;
 }

◆ load_module()

static int load_module ( void )

static

Definition at line 382 of file res_format_attr_h263.c.

References ast_format_interface_register, AST_MODFLAG_DEFAULT, AST_MODULE_INFO(), AST_MODULE_LOAD_DECLINE, AST_MODULE_LOAD_SUCCESS, AST_MODULE_SUPPORT_CORE, ASTERISK_GPL_KEY, and unload_module().

 {
  if (ast_format_interface_register("h263", &h263_interface)) {
  return AST_MODULE_LOAD_DECLINE;
  }
 
  if (ast_format_interface_register("h263p", &h263_interface)) {
  return AST_MODULE_LOAD_DECLINE;
  }
 
  return AST_MODULE_LOAD_SUCCESS;
 }

◆ unload_module()

static int unload_module ( void )

static

Definition at line 377 of file res_format_attr_h263.c.

Referenced by load_module().

 {
  return 0;
 }

Variable Documentation

◆ __mod_info

struct ast_module_info __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_DEFAULT , .description = "H.263 Format Attribute Module" , .key = "This paragraph is copyright (c) 2006 by Digium, Inc. \In order for your module to load, it must return this \key via a function called \"key\". Any code which \includes this paragraph must be licensed under the GNU \General Public License version 2 or later (at your \option). In addition to Digium's general reservations \of rights, Digium expressly reserves the right to \allow other parties to license this paragraph under \different terms. Any use of Digium, Inc. trademarks or \logos (including \"Asterisk\" or \"Digium\") without \express written permission of Digium, Inc. is prohibited.\n" , .buildopt_sum = "30ef0c93b36035ec78c9cfd712d36d9b" , .support_level = AST_MODULE_SUPPORT_CORE, .load = load_module, .unload = unload_module, }

static

Definition at line 399 of file res_format_attr_h263.c.

◆ ast_module_info

const struct ast_module_info* ast_module_info = &__mod_info

static

Definition at line 399 of file res_format_attr_h263.c.

◆ h263_interface

struct ast_format_interface h263_interface

static

Definition at line 368 of file res_format_attr_h263.c.

Data Structures

Macros

Functions

Variables

Detailed Description

Macro Definition Documentation

◆ APPEND_IF_NONZERO

◆ APPEND_IF_NOT_H263_UNSET

◆ DETERMINE_JOINT

◆ H263_ATTR_KEY_UNSET

Function Documentation

◆ __reg_module()

◆ __unreg_module()

◆ AST_MODULE_SELF_SYM()

◆ h263_clone()

◆ h263_cmp()

◆ h263_destroy()

◆ h263_generate_sdp_fmtp()

◆ h263_getjoint()

◆ h263_parse_sdp_fmtp()

◆ load_module()

◆ unload_module()

Variable Documentation

◆ __mod_info

◆ ast_module_info

◆ h263_interface