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utils.c
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utils.c
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/*! \file utils.c
* \author Lorenzo Miniero <lorenzo@meetecho.com>
* \copyright GNU General Public License v3
* \brief Utilities and helpers
* \details Implementations of a few methods that may be of use here
* and there in the code.
*
* \ingroup core
* \ref core
*/
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/file.h>
#include <sys/types.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <inttypes.h>
#include <zlib.h>
#include "utils.h"
#include "debug.h"
#include "mutex.h"
#if __MACH__
#include "mach_gettime.h"
#endif
gint64 janus_get_monotonic_time(void) {
struct timespec ts;
clock_gettime (CLOCK_MONOTONIC, &ts);
return (ts.tv_sec*G_GINT64_CONSTANT(1000000)) + (ts.tv_nsec/G_GINT64_CONSTANT(1000));
}
gint64 janus_get_real_time(void) {
struct timespec ts;
clock_gettime (CLOCK_REALTIME, &ts);
return (ts.tv_sec*G_GINT64_CONSTANT(1000000)) + (ts.tv_nsec/G_GINT64_CONSTANT(1000));
}
gboolean janus_is_true(const char *value) {
return value && (!strcasecmp(value, "yes") || !strcasecmp(value, "true") || !strcasecmp(value, "1"));
}
gboolean janus_strcmp_const_time(const void *str1, const void *str2) {
if(str1 == NULL || str2 == NULL)
return FALSE;
const unsigned char *string1 = (const unsigned char *)str1;
const unsigned char *string2 = (const unsigned char *)str2;
size_t maxlen = strlen((char *)string1);
if(strlen((char *)string2) > maxlen)
maxlen = strlen((char *)string2);
unsigned char *buf1 = g_malloc0(maxlen+1);
memcpy(buf1, string1, strlen(str1));
unsigned char *buf2 = g_malloc0(maxlen+1);
memcpy(buf2, string2, strlen(str2));
unsigned char result = 0;
size_t i = 0;
for (i = 0; i < maxlen; i++) {
result |= buf1[i] ^ buf2[i];
}
g_free(buf1);
buf1 = NULL;
g_free(buf2);
buf2 = NULL;
return result == 0;
}
guint32 janus_random_uint32(void) {
return g_random_int();
}
guint64 janus_random_uint64(void) {
/*
* FIXME This needs to be improved, and use something that generates
* more strongly random stuff... using /dev/urandom is probably not
* a good idea, as we don't want to make it harder to cross compile Janus
*
* TODO Look into what libssl and/or libcrypto provide in that respect
*
* PS: JavaScript only supports integer up to 2^53, so we need to
* make sure the number is below 9007199254740992 for safety
*/
guint64 num = g_random_int() & 0x1FFFFF;
num = (num << 32) | g_random_int();
return num;
}
guint64 *janus_uint64_dup(guint64 num) {
guint64 *numdup = g_malloc(sizeof(guint64));
*numdup = num;
return numdup;
}
int janus_string_to_uint8(const char *str, uint8_t *num) {
if(str == NULL || num == NULL)
return -EINVAL;
long int val = strtol(str, 0, 10);
if(val < 0 || val > UINT8_MAX)
return -ERANGE;
*num = val;
return 0;
}
int janus_string_to_uint16(const char *str, uint16_t *num) {
if(str == NULL || num == NULL)
return -EINVAL;
long int val = strtol(str, 0, 10);
if(val < 0 || val > UINT16_MAX)
return -ERANGE;
*num = val;
return 0;
}
int janus_string_to_uint32(const char *str, uint32_t *num) {
if(str == NULL || num == NULL)
return -EINVAL;
long long int val = strtoll(str, 0, 10);
if(val < 0 || val > UINT32_MAX)
return -ERANGE;
*num = val;
return 0;
}
void janus_flags_reset(janus_flags *flags) {
if(flags != NULL)
g_atomic_pointer_set(flags, 0);
}
void janus_flags_set(janus_flags *flags, gsize flag) {
if(flags != NULL) {
g_atomic_pointer_or(flags, flag);
}
}
void janus_flags_clear(janus_flags *flags, gsize flag) {
if(flags != NULL) {
g_atomic_pointer_and(flags, ~(flag));
}
}
gboolean janus_flags_is_set(janus_flags *flags, gsize flag) {
if(flags != NULL) {
gsize bit = ((gsize) g_atomic_pointer_get(flags)) & flag;
return (bit != 0);
}
return FALSE;
}
/* Easy way to replace multiple occurrences of a string with another */
char *janus_string_replace(char *message, const char *old_string, const char *new_string)
{
if(!message || !old_string || !new_string)
return NULL;
if(!strstr(message, old_string)) { /* Nothing to be done (old_string is not there) */
return message;
}
if(!strcmp(old_string, new_string)) { /* Nothing to be done (old_string=new_string) */
return message;
}
if(strlen(old_string) == strlen(new_string)) { /* Just overwrite */
char *outgoing = message;
char *pos = strstr(outgoing, old_string), *tmp = NULL;
int i = 0;
while(pos) {
i++;
memcpy(pos, new_string, strlen(new_string));
pos += strlen(old_string);
tmp = strstr(pos, old_string);
pos = tmp;
}
return outgoing;
} else { /* We need to resize */
char *outgoing = g_strdup(message);
g_free(message);
if(outgoing == NULL) {
return NULL;
}
int diff = strlen(new_string) - strlen(old_string);
/* Count occurrences */
int counter = 0;
char *pos = strstr(outgoing, old_string), *tmp = NULL;
while(pos) {
counter++;
pos += strlen(old_string);
tmp = strstr(pos, old_string);
pos = tmp;
}
uint16_t old_stringlen = strlen(outgoing)+1, new_stringlen = old_stringlen + diff*counter;
if(diff > 0) { /* Resize now */
tmp = g_realloc(outgoing, new_stringlen);
outgoing = tmp;
}
/* Replace string */
pos = strstr(outgoing, old_string);
while(pos) {
if(diff > 0) { /* Move to the right (new_string is larger than old_string) */
uint16_t len = strlen(pos)+1;
memmove(pos + diff, pos, len);
memcpy(pos, new_string, strlen(new_string));
pos += strlen(new_string);
tmp = strstr(pos, old_string);
} else { /* Move to the left (new_string is smaller than old_string) */
uint16_t len = strlen(pos - diff)+1;
memmove(pos, pos - diff, len);
memcpy(pos, new_string, strlen(new_string));
pos += strlen(old_string);
tmp = strstr(pos, old_string);
}
pos = tmp;
}
if(diff < 0) { /* We skipped the resize previously (shrinking memory) */
tmp = g_realloc(outgoing, new_stringlen);
outgoing = tmp;
}
outgoing[strlen(outgoing)] = '\0';
return outgoing;
}
}
int janus_mkdir(const char *dir, mode_t mode) {
char tmp[256];
char *p = NULL;
size_t len;
int res = 0;
g_snprintf(tmp, sizeof(tmp), "%s", dir);
len = strlen(tmp);
if(tmp[len - 1] == '/')
tmp[len - 1] = 0;
for(p = tmp + 1; *p; p++) {
if(*p == '/') {
*p = 0;
res = mkdir(tmp, mode);
if(res != 0 && errno != EEXIST) {
JANUS_LOG(LOG_ERR, "Error creating folder %s\n", tmp);
return res;
}
*p = '/';
}
}
res = mkdir(tmp, mode);
if(res != 0 && errno != EEXIST)
return res;
return 0;
}
int janus_get_codec_pt(const char *sdp, const char *codec) {
if(!sdp || !codec)
return -1;
int video = 0;
const char *format = NULL, *format2 = NULL;
if(!strcasecmp(codec, "opus")) {
video = 0;
format = "opus/48000/2";
format2 = "OPUS/48000/2";
} else if(!strcasecmp(codec, "pcmu")) {
/* We know the payload type is 0: we just need to make sure it's there */
video = 0;
format = "pcmu/8000";
format2 = "PCMU/8000";
} else if(!strcasecmp(codec, "pcma")) {
/* We know the payload type is 8: we just need to make sure it's there */
video = 0;
format = "pcma/8000";
format2 = "PCMA/8000";
} else if(!strcasecmp(codec, "g722")) {
/* We know the payload type is 9: we just need to make sure it's there */
video = 0;
format = "g722/8000";
format2 = "G722/8000";
} else if(!strcasecmp(codec, "isac16")) {
video = 0;
format = "isac/16000";
format2 = "ISAC/16000";
} else if(!strcasecmp(codec, "isac32")) {
video = 0;
format = "isac/32000";
format2 = "ISAC/32000";
} else if(!strcasecmp(codec, "vp8")) {
video = 1;
format = "vp8/90000";
format2 = "VP8/90000";
} else if(!strcasecmp(codec, "vp9")) {
video = 1;
format = "vp9/90000";
format2 = "VP9/90000";
} else if(!strcasecmp(codec, "h264")) {
video = 1;
format = "h264/90000";
format2 = "H264/90000";
} else {
JANUS_LOG(LOG_ERR, "Unsupported codec '%s'\n", codec);
return -1;
}
/* First of all, let's check if the codec is there */
if(!video) {
if(!strstr(sdp, "m=audio") || (!strstr(sdp, format) && !strstr(sdp, format2)))
return -2;
} else {
if(!strstr(sdp, "m=video") || (!strstr(sdp, format) && !strstr(sdp, format2)))
return -2;
}
char rtpmap[50], rtpmap2[50];
g_snprintf(rtpmap, 50, "a=rtpmap:%%d %s", format);
g_snprintf(rtpmap2, 50, "a=rtpmap:%%d %s", format2);
/* Look for the mapping */
const char *line = strstr(sdp, video ? "m=video" : "m=audio");
while(line) {
char *next = strchr(line, '\n');
if(next) {
*next = '\0';
if(strstr(line, "a=rtpmap") && strstr(line, format)) {
/* Gotcha! */
int pt = 0;
#pragma GCC diagnostic ignored "-Wformat-nonliteral"
if(sscanf(line, rtpmap, &pt) == 1) {
*next = '\n';
return pt;
}
} else if(strstr(line, "a=rtpmap") && strstr(line, format2)) {
/* Gotcha! */
int pt = 0;
if(sscanf(line, rtpmap2, &pt) == 1) {
#pragma GCC diagnostic warning "-Wformat-nonliteral"
*next = '\n';
return pt;
}
}
*next = '\n';
}
line = next ? (next+1) : NULL;
}
return -3;
}
const char *janus_get_codec_from_pt(const char *sdp, int pt) {
if(!sdp || pt < 0)
return NULL;
if(pt == 0)
return "pcmu";
if(pt == 8)
return "pcma";
if(pt == 9)
return "g722";
/* Look for the mapping */
char rtpmap[50];
g_snprintf(rtpmap, 50, "a=rtpmap:%d ", pt);
const char *line = strstr(sdp, "m=");
while(line) {
char *next = strchr(line, '\n');
if(next) {
*next = '\0';
if(strstr(line, rtpmap)) {
/* Gotcha! */
char name[100];
if(sscanf(line, "a=rtpmap:%d %s", &pt, name) == 2) {
*next = '\n';
if(strstr(name, "vp8") || strstr(name, "VP8"))
return "vp8";
if(strstr(name, "vp9") || strstr(name, "VP9"))
return "vp9";
if(strstr(name, "h264") || strstr(name, "H264"))
return "h264";
if(strstr(name, "opus") || strstr(name, "OPUS"))
return "opus";
if(strstr(name, "pcmu") || strstr(name, "PCMU"))
return "pcmu";
if(strstr(name, "pcma") || strstr(name, "PCMA"))
return "pcma";
if(strstr(name, "g722") || strstr(name, "G722"))
return "g722";
if(strstr(name, "isac/16") || strstr(name, "ISAC/16"))
return "isac16";
if(strstr(name, "isac/32") || strstr(name, "ISAC/32"))
return "isac32";
JANUS_LOG(LOG_ERR, "Unsupported codec '%s'\n", name);
return NULL;
}
}
*next = '\n';
}
line = next ? (next+1) : NULL;
}
return NULL;
}
/* PID file management */
static char *pidfile = NULL;
static int pidfd = -1;
static FILE *pidf = NULL;
int janus_pidfile_create(const char *file) {
if(file == NULL)
return 0;
pidfile = g_strdup(file);
/* Try creating a PID file (or opening an existing one) */
pidfd = open(pidfile, O_RDWR|O_CREAT|O_TRUNC, 0644);
if(pidfd < 0) {
JANUS_LOG(LOG_FATAL, "Error opening/creating PID file %s, does Janus have enough permissions?\n", pidfile);
return -1;
}
pidf = fdopen(pidfd, "r+");
if(pidf == NULL) {
JANUS_LOG(LOG_FATAL, "Error opening/creating PID file %s, does Janus have enough permissions?\n", pidfile);
close(pidfd);
return -1;
}
/* Try locking the PID file */
int pid = 0;
if(flock(pidfd, LOCK_EX|LOCK_NB) < 0) {
if(fscanf(pidf, "%d", &pid) == 1) {
JANUS_LOG(LOG_FATAL, "Error locking PID file (lock held by PID %d?)\n", pid);
} else {
JANUS_LOG(LOG_FATAL, "Error locking PID file (lock held by unknown PID?)\n");
}
fclose(pidf);
return -1;
}
/* Write the PID */
pid = getpid();
if(fprintf(pidf, "%d\n", pid) < 0) {
JANUS_LOG(LOG_FATAL, "Error writing PID in file, error %d (%s)\n", errno, strerror(errno));
fclose(pidf);
return -1;
}
fflush(pidf);
/* We're done */
return 0;
}
int janus_pidfile_remove(void) {
if(pidfile == NULL || pidfd < 0 || pidf == NULL)
return 0;
/* Unlock the PID file and remove it */
if(flock(pidfd, LOCK_UN) < 0) {
JANUS_LOG(LOG_FATAL, "Error unlocking PID file\n");
fclose(pidf);
close(pidfd);
return -1;
}
fclose(pidf);
unlink(pidfile);
g_free(pidfile);
return 0;
}
/* Protected folders management */
static GList *protected_folders = NULL;
static janus_mutex pf_mutex = JANUS_MUTEX_INITIALIZER;
void janus_protected_folder_add(const char *folder) {
if(folder == NULL)
return;
janus_mutex_lock(&pf_mutex);
protected_folders = g_list_append(protected_folders, g_strdup(folder));
janus_mutex_unlock(&pf_mutex);
}
gboolean janus_is_folder_protected(const char *path) {
/* We need a valid pathname (can't start with a space, we don't trim) */
if(path == NULL || *path == ' ')
return TRUE;
/* Resolve the pathname to its real path first */
char resolved[PATH_MAX+1];
resolved[0] = '\0';
if(realpath(path, resolved) == NULL && errno != ENOENT) {
JANUS_LOG(LOG_ERR, "Error resolving path '%s'... %d (%s)\n",
path, errno, strerror(errno));
return TRUE;
}
/* Traverse the list of protected folders to see if any match */
janus_mutex_lock(&pf_mutex);
if(protected_folders == NULL) {
/* No protected folder in the list */
janus_mutex_unlock(&pf_mutex);
return FALSE;
}
gboolean protected = FALSE;
GList *temp = protected_folders;
while(temp) {
char *folder = (char *)temp->data;
if(folder && (strstr(resolved, folder) == resolved)) {
protected = TRUE;
break;
}
temp = temp->next;
}
janus_mutex_unlock(&pf_mutex);
return protected;
}
void janus_protected_folders_clear(void) {
janus_mutex_lock(&pf_mutex);
g_list_free_full(protected_folders, (GDestroyNotify)g_free);
janus_mutex_unlock(&pf_mutex);
}
void janus_get_json_type_name(int jtype, unsigned int flags, char *type_name) {
/* Longest possible combination is "a non-empty boolean" plus one for null char */
gsize req_size = 20;
/* Don't allow for both "positive" and "non-empty" because that needlessly increases the size. */
if((flags & JANUS_JSON_PARAM_POSITIVE) != 0) {
g_strlcpy(type_name, "a positive ", req_size);
}
else if((flags & JANUS_JSON_PARAM_NONEMPTY) != 0) {
g_strlcpy(type_name, "a non-empty ", req_size);
}
else if(jtype == JSON_INTEGER || jtype == JSON_ARRAY || jtype == JSON_OBJECT) {
g_strlcpy(type_name, "an ", req_size);
}
else {
g_strlcpy(type_name, "a ", req_size);
}
switch(jtype) {
case JSON_TRUE:
g_strlcat(type_name, "boolean", req_size);
break;
case JSON_INTEGER:
g_strlcat(type_name, "integer", req_size);
break;
case JSON_REAL:
g_strlcat(type_name, "real", req_size);
break;
case JSON_STRING:
g_strlcat(type_name, "string", req_size);
break;
case JSON_ARRAY:
g_strlcat(type_name, "array", req_size);
break;
case JSON_OBJECT:
g_strlcat(type_name, "object", req_size);
break;
default:
break;
}
}
gboolean janus_json_is_valid(json_t *val, json_type jtype, unsigned int flags) {
gboolean is_valid = (json_typeof(val) == jtype || (jtype == JSON_TRUE && json_typeof(val) == JSON_FALSE));
if(!is_valid)
return FALSE;
if((flags & JANUS_JSON_PARAM_POSITIVE) != 0) {
switch(jtype) {
case JSON_INTEGER:
is_valid = (json_integer_value(val) >= 0);
break;
case JSON_REAL:
is_valid = (json_real_value(val) >= 0);
break;
default:
break;
}
}
else if((flags & JANUS_JSON_PARAM_NONEMPTY) != 0) {
switch(jtype) {
case JSON_STRING:
is_valid = (strlen(json_string_value(val)) > 0);
break;
case JSON_ARRAY:
is_valid = (json_array_size(val) > 0);
break;
default:
break;
}
}
return is_valid;
}
/* The following code is more related to codec specific helpers */
#if defined(__ppc__) || defined(__ppc64__)
# define swap2(d) \
((d&0x000000ff)<<8) | \
((d&0x0000ff00)>>8)
#else
# define swap2(d) d
#endif
gboolean janus_vp8_is_keyframe(const char *buffer, int len) {
if(!buffer || len < 16)
return FALSE;
/* Parse VP8 header now */
uint8_t vp8pd = *buffer;
uint8_t xbit = (vp8pd & 0x80);
uint8_t sbit = (vp8pd & 0x10);
if(xbit) {
JANUS_LOG(LOG_HUGE, " -- X bit is set!\n");
/* Read the Extended control bits octet */
buffer++;
vp8pd = *buffer;
uint8_t ibit = (vp8pd & 0x80);
uint8_t lbit = (vp8pd & 0x40);
uint8_t tbit = (vp8pd & 0x20);
uint8_t kbit = (vp8pd & 0x10);
if(ibit) {
JANUS_LOG(LOG_HUGE, " -- I bit is set!\n");
/* Read the PictureID octet */
buffer++;
vp8pd = *buffer;
uint16_t picid = vp8pd, wholepicid = picid;
uint8_t mbit = (vp8pd & 0x80);
if(mbit) {
JANUS_LOG(LOG_HUGE, " -- M bit is set!\n");
memcpy(&picid, buffer, sizeof(uint16_t));
wholepicid = ntohs(picid);
picid = (wholepicid & 0x7FFF);
buffer++;
}
JANUS_LOG(LOG_HUGE, " -- -- PictureID: %"SCNu16"\n", picid);
}
if(lbit) {
JANUS_LOG(LOG_HUGE, " -- L bit is set!\n");
/* Read the TL0PICIDX octet */
buffer++;
vp8pd = *buffer;
}
if(tbit || kbit) {
JANUS_LOG(LOG_HUGE, " -- T/K bit is set!\n");
/* Read the TID/KEYIDX octet */
buffer++;
vp8pd = *buffer;
}
buffer++; /* Now we're in the payload */
if(sbit) {
JANUS_LOG(LOG_HUGE, " -- S bit is set!\n");
unsigned long int vp8ph = 0;
memcpy(&vp8ph, buffer, 4);
vp8ph = ntohl(vp8ph);
uint8_t pbit = ((vp8ph & 0x01000000) >> 24);
if(!pbit) {
JANUS_LOG(LOG_HUGE, " -- P bit is NOT set!\n");
/* It is a key frame! Get resolution for debugging */
unsigned char *c = (unsigned char *)buffer+3;
/* vet via sync code */
if(c[0]!=0x9d||c[1]!=0x01||c[2]!=0x2a) {
JANUS_LOG(LOG_HUGE, "First 3-bytes after header not what they're supposed to be?\n");
} else {
unsigned short val3, val5;
memcpy(&val3,c+3,sizeof(short));
int vp8w = swap2(val3)&0x3fff;
int vp8ws = swap2(val3)>>14;
memcpy(&val5,c+5,sizeof(short));
int vp8h = swap2(val5)&0x3fff;
int vp8hs = swap2(val5)>>14;
JANUS_LOG(LOG_HUGE, "Got a VP8 key frame: %dx%d (scale=%dx%d)\n", vp8w, vp8h, vp8ws, vp8hs);
return TRUE;
}
}
}
}
/* If we got here it's not a key frame */
return FALSE;
}
gboolean janus_vp9_is_keyframe(const char *buffer, int len) {
if(!buffer || len < 16)
return FALSE;
/* Parse VP9 header now */
uint8_t vp9pd = *buffer;
uint8_t ibit = (vp9pd & 0x80);
uint8_t pbit = (vp9pd & 0x40);
uint8_t lbit = (vp9pd & 0x20);
uint8_t fbit = (vp9pd & 0x10);
uint8_t vbit = (vp9pd & 0x02);
buffer++;
len--;
if(ibit) {
/* Read the PictureID octet */
vp9pd = *buffer;
uint16_t picid = vp9pd, wholepicid = picid;
uint8_t mbit = (vp9pd & 0x80);
if(!mbit) {
buffer++;
len--;
} else {
memcpy(&picid, buffer, sizeof(uint16_t));
wholepicid = ntohs(picid);
picid = (wholepicid & 0x7FFF);
buffer += 2;
len -= 2;
}
}
if(lbit) {
buffer++;
len--;
if(!fbit) {
/* Non-flexible mode, skip TL0PICIDX */
buffer++;
len--;
}
}
if(fbit && pbit) {
/* Skip reference indices */
uint8_t nbit = 1;
while(nbit) {
vp9pd = *buffer;
nbit = (vp9pd & 0x01);
buffer++;
len--;
if(len == 0) /* Make sure we don't overflow */
return FALSE;
}
}
if(vbit) {
/* Parse and skip SS */
vp9pd = *buffer;
uint n_s = (vp9pd & 0xE0) >> 5;
n_s++;
uint8_t ybit = (vp9pd & 0x10);
if(ybit) {
/* Iterate on all spatial layers and get resolution */
buffer++;
len--;
if(len == 0) /* Make sure we don't overflow */
return FALSE;
uint i=0;
for(i=0; i<n_s && len>=4; i++,len-=4) {
/* Width */
uint16_t w;
memcpy(&w, buffer, sizeof(uint16_t));
int vp9w = ntohs(w);
buffer += 2;
/* Height */
uint16_t h;
memcpy(&h, buffer, sizeof(uint16_t));
int vp9h = ntohs(h);
buffer += 2;
if(vp9w || vp9h) {
JANUS_LOG(LOG_HUGE, "Got a VP9 key frame: %dx%d\n", vp9w, vp9h);
return TRUE;
}
}
}
}
/* If we got here it's not a key frame */
return FALSE;
}
gboolean janus_h264_is_keyframe(const char *buffer, int len) {
if(!buffer || len < 16)
return FALSE;
/* Parse H264 header now */
uint8_t fragment = *buffer & 0x1F;
uint8_t nal = *(buffer+1) & 0x1F;
if(fragment == 7 || ((fragment == 28 || fragment == 29) && nal == 7)) {
JANUS_LOG(LOG_HUGE, "Got an H264 key frame\n");
return TRUE;
} else if(fragment == 24) {
/* May we find an SPS in this STAP-A? */
buffer++;
len--;
uint16_t psize = 0;
/* We're reading 3 bytes */
while(len > 2) {
memcpy(&psize, buffer, 2);
psize = ntohs(psize);
buffer += 2;
len -= 2;
int nal = *buffer & 0x1F;
if(nal == 7) {
JANUS_LOG(LOG_HUGE, "Got an SPS/PPS\n");
return TRUE;
}
buffer += psize;
len -= psize;
}
}
/* If we got here it's not a key frame */
return FALSE;
}
int janus_vp8_parse_descriptor(char *buffer, int len,
uint16_t *picid, uint8_t *tl0picidx, uint8_t *tid, uint8_t *y, uint8_t *keyidx) {
if(!buffer || len < 6)
return -1;
if(picid)
*picid = 0;
if(tl0picidx)
*tl0picidx = 0;
if(tid)
*tid = 0;
if(y)
*y = 0;
if(keyidx)
*keyidx = 0;
uint8_t vp8pd = *buffer;
uint8_t xbit = (vp8pd & 0x80);
/* Read the Extended control bits octet */
if(xbit) {
buffer++;
vp8pd = *buffer;
uint8_t ibit = (vp8pd & 0x80);
uint8_t lbit = (vp8pd & 0x40);
uint8_t tbit = (vp8pd & 0x20);
uint8_t kbit = (vp8pd & 0x10);
if(ibit) {
/* Read the PictureID octet */
buffer++;
vp8pd = *buffer;
uint16_t partpicid = vp8pd, wholepicid = partpicid;
uint8_t mbit = (vp8pd & 0x80);
if(mbit) {
memcpy(&partpicid, buffer, sizeof(uint16_t));
wholepicid = ntohs(partpicid);
partpicid = (wholepicid & 0x7FFF);
if(picid)
*picid = partpicid;
buffer++;
}
}
if(lbit) {
/* Read the TL0PICIDX octet */
buffer++;
vp8pd = *buffer;
if(tl0picidx)
*tl0picidx = vp8pd;
}
if(tbit || kbit) {
/* Read the TID/Y/KEYIDX octet */
buffer++;
vp8pd = *buffer;
if(tid)
*tid = (vp8pd & 0xC0) >> 6;
if(y)
*y = (vp8pd & 0x20) >> 5;
if(keyidx)
*keyidx = (vp8pd & 0x1F) >> 4;
}
}
return 0;
}
static int janus_vp8_replace_descriptor(char *buffer, int len, uint16_t picid, uint8_t tl0picidx) {
if(!buffer || len < 6)
return -1;
uint8_t vp8pd = *buffer;
uint8_t xbit = (vp8pd & 0x80);
/* Read the Extended control bits octet */
if(xbit) {
buffer++;
vp8pd = *buffer;
uint8_t ibit = (vp8pd & 0x80);
uint8_t lbit = (vp8pd & 0x40);
uint8_t tbit = (vp8pd & 0x20);
uint8_t kbit = (vp8pd & 0x10);
if(ibit) {
/* Overwrite the PictureID octet */
buffer++;
vp8pd = *buffer;
uint8_t mbit = (vp8pd & 0x80);
if(!mbit) {
*buffer = picid;
} else {
uint16_t wholepicid = htons(picid);
memcpy(buffer, &wholepicid, 2);
*buffer |= 0x80;
buffer++;
}
}
if(lbit) {
/* Overwrite the TL0PICIDX octet */
buffer++;
*buffer = tl0picidx;
}
if(tbit || kbit) {
/* Should we overwrite the TID/Y/KEYIDX octet? */
buffer++;
}
}
return 0;
}
void janus_vp8_simulcast_context_reset(janus_vp8_simulcast_context *context) {
if(context == NULL)
return;
/* Reset the context values */
context->last_picid = 0;
context->base_picid = 0;
context->base_picid_prev = 0;
context->last_tlzi = 0;
context->base_tlzi = 0;
context->base_tlzi_prev = 0;
}
void janus_vp8_simulcast_descriptor_update(char *buffer, int len, janus_vp8_simulcast_context *context, gboolean switched) {
if(!buffer || len < 0)
return;
uint16_t picid = 0;
uint8_t tlzi = 0;
uint8_t tid = 0;
uint8_t ybit = 0;
uint8_t keyidx = 0;
/* Parse the identifiers in the VP8 payload descriptor */
if(janus_vp8_parse_descriptor(buffer, len, &picid, &tlzi, &tid, &ybit, &keyidx) < 0)
return;
if(switched) {
context->base_picid_prev = context->last_picid;
context->base_picid = picid;
context->base_tlzi_prev = context->last_tlzi;
context->base_tlzi = tlzi;
}
context->last_picid = (picid-context->base_picid)+context->base_picid_prev+1;
context->last_tlzi = (tlzi-context->base_tlzi)+context->base_tlzi_prev+1;
/* Overwrite the values in the VP8 payload descriptors with the ones we have */
janus_vp8_replace_descriptor(buffer, len, context->last_picid, context->last_tlzi);
}
/* Helper method to parse a VP9 RTP video frame and get some SVC-related info:
* notice that this only works with VP9, right now, on an experimental basis */
int janus_vp9_parse_svc(char *buffer, int len, gboolean *found, janus_vp9_svc_info *info) {
if(!buffer || len < 8)
return -1;
/* VP9 depay: */
/* https://tools.ietf.org/html/draft-ietf-payload-vp9-04 */
/* Read the first octet (VP9 Payload Descriptor) */
uint8_t vp9pd = *buffer;
uint8_t ibit = (vp9pd & 0x80) >> 7;
uint8_t pbit = (vp9pd & 0x40) >> 6;
uint8_t lbit = (vp9pd & 0x20) >> 5;
uint8_t fbit = (vp9pd & 0x10) >> 4;
uint8_t bbit = (vp9pd & 0x08) >> 3;
uint8_t ebit = (vp9pd & 0x04) >> 2;
uint8_t vbit = (vp9pd & 0x02) >> 1;
if(!lbit) {
/* No Layer indices present, no need to go on */
if(found)
*found = FALSE;
return 0;
}
/* Move to the next octet and see what's there */
buffer++;
len--;
if(ibit) {
/* Read the PictureID octet */
vp9pd = *buffer;
uint16_t picid = vp9pd, wholepicid = picid;
uint8_t mbit = (vp9pd & 0x80);
if(!mbit) {
buffer++;
len--;
} else {
memcpy(&picid, buffer, sizeof(uint16_t));
wholepicid = ntohs(picid);
picid = (wholepicid & 0x7FFF);
buffer += 2;
len -= 2;
}
}
if(lbit) {
/* Read the octet and parse the layer indices now */
vp9pd = *buffer;
int tlid = (vp9pd & 0xE0) >> 5;
uint8_t ubit = (vp9pd & 0x10) >> 4;
int slid = (vp9pd & 0x0E) >> 1;
uint8_t dbit = (vp9pd & 0x01);
JANUS_LOG(LOG_HUGE, "%s Mode, Layer indices: Temporal: %d (u=%u), Spatial: %d (d=%u)\n",
fbit ? "Flexible" : "Non-flexible", tlid, ubit, slid, dbit);
if(info) {
info->temporal_layer = tlid;
info->spatial_layer = slid;
info->fbit = fbit;
info->pbit = pbit;
info->dbit = dbit;
info->ubit = ubit;
info->bbit = bbit;
info->ebit = ebit;
}
if(found)
*found = TRUE;
/* Go on, just to get to the SS, if available (which we currently ignore anyway) */
buffer++;
len--;
if(!fbit) {
/* Non-flexible mode, skip TL0PICIDX */
buffer++;
len--;
}
}
if(fbit && pbit) {
/* Skip reference indices */
uint8_t nbit = 1;
while(nbit) {
vp9pd = *buffer;
nbit = (vp9pd & 0x01);
buffer++;
len--;
if(len == 0) /* Make sure we don't overflow */
return -1;
}
}
if(vbit) {
/* Parse and skip SS */
vp9pd = *buffer;
int n_s = (vp9pd & 0xE0) >> 5;
n_s++;