static int
h264or5_get_vparam(int type, int channelId, unsigned char *data, int datalen) {
int ret = -1;
unsigned char *r;
unsigned char *sps = NULL, *pps = NULL, *vps = NULL;
int spslen = 0, ppslen = 0, vpslen = 0;
if(_sps[channelId] != NULL)
return 0;
r = find_startcode(data, data + datalen);
while(r < data + datalen) {
unsigned char nal_type;
unsigned char *r1;
#if 0
if(sps != NULL && pps != NULL)
break;
#endif
while(0 == (*r++))
;
r1 = find_startcode(r, data + datalen);
if(type == 265) {
nal_type = ((*r)>>1) & 0x3f;
if(nal_type == 32) { // VPS
vps = r;
vpslen = r1 - r;
} else if(nal_type == 33) { // SPS
sps = r;
spslen = r1 - r;
} else if(nal_type == 34) { // PPS
pps = r;
ppslen = r1 - r;
}
} else {
static char *encode_header(uint8_t *p, unsigned int len, int packet_mode)
{
uint8_t *end = p + len;
char *sprop = NULL, *out, *buf = NULL;
const uint8_t *r = find_startcode(p, end);
while (r < end) {
const uint8_t *r1;
uint8_t nal_type;
while (!*(r++));
nal_type = *r & 0x1f;
r1 = find_startcode(r, end);
if (nal_type != 7 && nal_type != 8) { /* Only output SPS and PPS */
r = r1;
continue;
}
if (buf == NULL) {
// profile-level-id aka the first 3 bytes from sps
out = g_strdup_printf("profile-level-id=%02x%02x%02x; "
"packetization-mode=%d; ",
r[0], r[1], r[2], packet_mode);
buf = g_base64_encode(r, r1-r);
sprop = g_strdup_printf("%ssprop-parameter-sets=%s", out, buf);
g_free(out);
g_free(buf);
} else {
buf = g_base64_encode(r, r1-r);
out = g_strdup_printf("%s,%s",sprop, buf);
g_free(sprop);
g_free(buf);
sprop = out;
}
}
return sprop;
}
/* determine the position of the packed marker in the userdata,
* the number of VOPs and the position of the second VOP */
static void scan_buffer(const uint8_t *buf, int buf_size,
int *pos_p, int *nb_vop, int *pos_vop2) {
unsigned int startcode;
int pos, i;
for (pos = 0; pos < buf_size;) {
startcode = find_startcode(buf, buf_size, &pos);
if (startcode == USER_DATA_STARTCODE && pos_p) {
/* check if the (DivX) userdata string ends with 'p' (packed) */
for (i = 0; i < 255 && pos + i + 1 < buf_size; i++) {
if (buf[pos + i] == 'p' && buf[pos + i + 1] == '\0') {
*pos_p = pos + i;
break;
}
}
} else if (startcode == VOP_STARTCODE && nb_vop) {
*nb_vop += 1;
if (*nb_vop == 2 && pos_vop2) {
*pos_vop2 = pos - 4; /* subtract 4 bytes startcode */
}
}
}
}
