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res_format_attr_h263: Generate valid SDP fmtp for H.263+.

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Fixed:
* RFC 4629 does not allow the value "0" for MPI, K, and N.
* Allow value "0" for PAR.
* BPP is printed only when specified because "0" has a meaning.

New:
* Added CPCF and MaxBR.
* Some implementations provide CIF without MPI: a=fmtp:xx CIF;F=1
  Although a violation of RFC 3555 section 3, we can support that.

Changed:
* Resorts the CIFs from large to small which partly fixes ASTERISK~29267.

Change-Id: I95a650c715007b8dde11a77cb37d9c6c123a441e
pull/23/head
Alexander Traud 5 years ago committed by Joshua Colp
parent 2c1b6b7b15
commit a34e7de61c
1 changed files with 123 additions and 9 deletions
Show Stats Download Patch File Download Diff File

132
res/res_format_attr_h263.c
Unescape View File

@ -36,6 +36,9 @@
#include "asterisk/module.h"
#include "asterisk/format.h"
/*! \brief Value that indicates an attribute is actually unset */
#define H263_ATTR_KEY_UNSET UINT8_MAX
struct h263_attr {
unsigned int SQCIF; /*!< Minimum picture interval for SQCIF resolution */
unsigned int QCIF; /*!< Minimum picture interval for QCIF resolution */
@ -46,6 +49,14 @@ struct h263_attr {
unsigned int CUSTOM_XMAX; /*!< Custom resolution (Xmax) */
unsigned int CUSTOM_YMAX; /*!< Custom resolution (Ymax) */
unsigned int CUSTOM_MPI; /*!< Custom resolution (MPI) */
unsigned int CPCF; /*!< Custom Picture Clock Frequency */
unsigned int CPCF_2;
unsigned int CPCF_3;
unsigned int CPCF_4;
unsigned int CPCF_5;
unsigned int CPCF_6;
unsigned int CPCF_7;
unsigned int CPCF_MPI;
unsigned int F; /*!< F annex support */
unsigned int I; /*!< I annex support */
unsigned int J; /*!< J annex support */
@ -60,6 +71,7 @@ struct h263_attr {
unsigned int PAR_HEIGHT; /*!< Pixel aspect ratio (height) */
unsigned int BPP; /*!< Bits per picture maximum */
unsigned int HRD; /*!< Hypothetical reference decoder status */
unsigned int MaxBR; /*!< Vendor Specific: CounterPath Bria (Solo) */
};
static void h263_destroy(struct ast_format *format)
@ -123,6 +135,14 @@ static struct ast_format *h263_getjoint(const struct ast_format *format1, const
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);
@ -137,6 +157,7 @@ static struct ast_format *h263_getjoint(const struct ast_format *format1, const
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;
}
@ -153,27 +174,54 @@ static struct ast_format *h263_parse_sdp_fmtp(const struct ast_format *format, c
}
attr = ast_format_get_attribute_data(cloned);
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;
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) {
@ -198,34 +246,85 @@ static struct ast_format *h263_parse_sdp_fmtp(const struct ast_format *format, c
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;
}
#define APPEND_IF_NOT_H263_UNSET(field, str, name) do { \
if (field != 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, "%s=%u", name, field); \
} \
} while (0)
#define APPEND_IF_NONZERO(field, str, name) do { \
if (field) { \
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, "%s=%u", name, field); \
} \
} while (0)
static void h263_generate_sdp_fmtp(const struct ast_format *format, unsigned int payload, struct ast_str **str)
{
struct h263_attr *attr = ast_format_get_attribute_data(format);
int added = 0;
if (!attr) {
return;
}
ast_str_append(str, 0, "a=fmtp:%u SQCIF=%u;QCIF=%u;CIF=%u;CIF4=%u;CIF16=%u;VGA=%u;F=%u;I=%u;J=%u;T=%u;K=%u;N=%u;BPP=%u;HRD=%u",
payload, attr->SQCIF, attr->QCIF, attr->CIF, attr->CIF4, attr->CIF16, attr->VGA, attr->F, attr->I, attr->J,
attr->T, attr->K, attr->N, attr->BPP, attr->HRD);
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) {
ast_str_append(str, 0, ";CUSTOM=%u,%u,%u", 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);
}
if (attr->PAR_WIDTH && attr->PAR_HEIGHT) {
ast_str_append(str, 0, ";PAR=%u:%u", attr->PAR_WIDTH, attr->PAR_HEIGHT);
}
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) {
ast_str_append(str, 0, ";P=%u", 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);
}
@ -237,6 +336,21 @@ static void h263_generate_sdp_fmtp(const struct ast_format *format, unsigned int
}
}
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;

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