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module-emulator-streamserver.c
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module-emulator-streamserver.c
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#define MODULE_LOG_PREFIX "emu"
#include "globals.h"
#ifdef WITH_EMU
#include "cscrypt/des.h"
#include "ffdecsa/ffdecsa.h"
#include "module-emulator-osemu.h"
#include "module-emulator-streamserver.h"
#include "module-emulator-powervu.h"
#include "module-emulator-icam.h"
#include "oscam-config.h"
#include "oscam-net.h"
#include "oscam-string.h"
#include "oscam-time.h"
#include "oscam-chk.h"
#define STREAM_UNDEFINED 0x00
#define STREAM_VIDEO 0x01
#define STREAM_AUDIO 0x02
#define STREAM_SUBTITLE 0x03
#define STREAM_TELETEXT 0x04
extern int32_t exit_oscam;
typedef struct
{
int32_t connfd;
int32_t connid;
} emu_stream_client_conn_data;
int8_t stream_server_thread_init = 0;
char emu_stream_source_host[256] = {"127.0.0.1"};
int32_t emu_stream_source_port = 8001;
char *emu_stream_source_auth = NULL;
int32_t emu_stream_relay_port = 17999;
int8_t emu_stream_emm_enabled = 0;
uint32_t cluster_size = 50;
static uint8_t emu_stream_server_mutex_init = 0;
static pthread_mutex_t emu_stream_server_mutex;
static int32_t glistenfd, gconncount = 0, gconnfd[EMU_STREAM_SERVER_MAX_CONNECTIONS];
pthread_mutex_t emu_fixed_key_srvid_mutex;
uint16_t emu_stream_cur_srvid[EMU_STREAM_SERVER_MAX_CONNECTIONS];
int8_t stream_server_has_ecm[EMU_STREAM_SERVER_MAX_CONNECTIONS];
pthread_mutex_t emu_fixed_key_data_mutex[EMU_STREAM_SERVER_MAX_CONNECTIONS];
emu_stream_client_key_data emu_fixed_key_data[EMU_STREAM_SERVER_MAX_CONNECTIONS];
LLIST *ll_emu_stream_delayed_keys[EMU_STREAM_SERVER_MAX_CONNECTIONS];
static void SearchTsPackets(uint8_t *buf, uint32_t bufLength, uint16_t *packetSize, uint16_t *startOffset)
{
uint32_t i;
(*packetSize) = 0;
(*startOffset) = 0;
for (i = 0; i < bufLength; i++)
{
if (buf[i] == 0x47)
{
// if three packets align, probably safe to assume correct size
if ((buf[i + 188] == 0x47) & (buf[i + 376] == 0x47))
{
(*packetSize) = 188;
(*startOffset) = i;
return;
}
else if ((buf[i + 204] == 0x47) & (buf[i + 408] == 0x47))
{
(*packetSize) = 204;
(*startOffset) = i;
return;
}
else if ((buf[i + 208] == 0x47) & (buf[i + 416] == 0x47))
{
(*packetSize) = 208;
(*startOffset) = i;
return;
}
}
}
}
typedef void (*ts_data_callback)(emu_stream_client_data *cdata);
static void ParseTsData(uint8_t table_id, uint8_t table_mask, uint8_t min_table_length, int8_t *flag,
uint8_t *data, uint16_t data_length, uint16_t *data_pos, int8_t payloadStart,
uint8_t *buf, int32_t len, ts_data_callback func, emu_stream_client_data *cdata)
{
int8_t found_start = 0;
int32_t free_data_length, copySize, i;
uint16_t section_length, offset = 0;
if (len < 1)
{
return;
}
if (*flag == 0 && !payloadStart)
{
return;
}
if (*flag == 0)
{
*data_pos = 0;
offset = 1 + buf[0];
}
else if (payloadStart)
{
offset = 1;
}
if (len - offset < 1)
{
return;
}
free_data_length = data_length - *data_pos;
copySize = (len - offset) > free_data_length ? free_data_length : (len - offset);
memcpy(data + (*data_pos), buf + offset, copySize);
(*data_pos) += copySize;
found_start = 0;
for (i = 0; i < *data_pos; i++)
{
if ((data[i] & table_mask) == table_id)
{
if (i != 0)
{
if ((*data_pos) - i > i)
{
memmove(data, &data[i], (*data_pos) - i);
}
else
{
memcpy(data, &data[i], (*data_pos) - i);
}
*data_pos -= i;
}
found_start = 1;
break;
}
}
if (!found_start)
{
*flag = 0;
return;
}
*flag = 2;
if (*data_pos < 3)
{
return;
}
section_length = SCT_LEN(data);
if (section_length > data_length || section_length < min_table_length)
{
*flag = 0;
return;
}
if ((*data_pos) < section_length)
{
return;
}
func(cdata);
found_start = 0;
for (i = section_length; i < *data_pos; i++)
{
if ((data[i] & table_mask) == table_id)
{
if ((*data_pos) - i > i)
{
memmove(data, &data[i], (*data_pos) - i);
}
else
{
memcpy(data, &data[i], (*data_pos) - i);
}
*data_pos -= i;
found_start = 1;
break;
}
}
if (!found_start)
{
*data_pos = 0;
}
*flag = 1;
}
static void ParsePatData(emu_stream_client_data *cdata)
{
int32_t i;
uint8_t *data = cdata->pat_data;
uint16_t srvid, section_length = SCT_LEN(data);
for (i = 8; i + 7 < section_length; i += 4)
{
srvid = b2i(2, data + i);
if (srvid == 0)
{
continue;
}
if (cdata->srvid == srvid)
{
cdata->pmt_pid = b2i(2, data + i + 2) & 0x1FFF;
cs_log_dbg(D_READER, "Stream client %i found pmt pid: 0x%04X (%i)",
cdata->connid, cdata->pmt_pid, cdata->pmt_pid);
break;
}
}
}
static int8_t stream_client_get_caid(emu_stream_client_data *cdata)
{
uint32_t tmp1 = (cdata->srvid << 16) | cdata->pmt_pid;
uint8_t tmp2[2];
if (emu_find_key('A', tmp1, 0, "FAKE", tmp2, 2, 0, 0, 0, NULL))
{
cdata->caid = b2i(2, tmp2);
return 1;
}
return 0;
}
static void ParseDescriptors(uint8_t *buffer, uint16_t info_length, uint8_t *type)
{
uint8_t descriptor_tag = buffer[0], descriptor_length = 0;
uint32_t j, k;
if (info_length < 1)
{
return;
}
for (j = 0; j + 1 < info_length; j += descriptor_length + 2)
{
descriptor_tag = buffer[j];
descriptor_length = buffer[j + 1];
switch (descriptor_tag)
{
case 0x05: // Registration descriptor
{
// "HDMV" format identifier is removed
// OSCam does not need to know about Blu-ray
const char format_identifiers_audio[10][5] =
{
"AC-3", "BSSD", "dmat", "DRA1", "DTS1",
"DTS2", "DTS3", "EAC3", "mlpa", "Opus",
};
for (k = 0; k < 10; k++)
{
if (memcmp(buffer + j + 2, format_identifiers_audio[k], 4) == 0)
{
*type = STREAM_AUDIO;
break;
}
}
break;
}
//case 0x09: // CA descriptor
//{
// break;
//}
case 0x46: // VBI teletext descriptor (DVB)
case 0x56: // teletext descriptor (DVB)
{
*type = STREAM_TELETEXT;
break;
}
case 0x59: // subtitling descriptor (DVB)
{
*type = STREAM_SUBTITLE;
break;
}
case 0x6A: // AC-3 descriptor (DVB)
case 0x7A: // enhanced AC-3 descriptor (DVB)
case 0x7B: // DTS descriptor (DVB)
case 0x7C: // AAC descriptor (DVB)
case 0x81: // AC-3 descriptor (ATSC)
case 0xCC: // Enhanced AC-3 descriptor (ATSC)
{
*type = STREAM_AUDIO;
break;
}
case 0x7F: // extension descriptor (DVB)
{
uint8_t extension_descriptor_tag = buffer[j + 2];
switch (extension_descriptor_tag)
{
case 0x0E: // DTS-HD descriptor (DVB)
case 0x0F: // DTS Neural descriptor (DVB)
case 0x15: // AC-4 descriptor (DVB)
*type = STREAM_AUDIO;
break;
case 0x20: // TTML subtitling descriptor (DVB)
*type = STREAM_SUBTITLE;
break;
default:
*type = STREAM_UNDEFINED;
break;
}
break;
}
default:
break;
}
}
}
static void ParsePmtData(emu_stream_client_data *cdata)
{
int32_t i;
uint8_t *data = cdata->pmt_data;
uint8_t descriptor_tag = 0, descriptor_length = 0, stream_type;
uint16_t program_info_length = 0, es_info_length = 0, elementary_pid, caid;
uint16_t section_length = SCT_LEN(data);
cdata->pcr_pid = b2i(2, data + 8) & 0x1FFF;
if (cdata->pcr_pid != 0x1FFF)
{
cs_log_dbg(D_READER, "Stream client %i found pcr pid: 0x%04X (%i)",
cdata->connid, cdata->pcr_pid, cdata->pcr_pid);
}
program_info_length = b2i(2, data + 10) & 0xFFF;
if (12 + program_info_length >= section_length)
{
return;
}
// parse program descriptors (we are looking only for CA descriptor here)
for (i = 12; i + 1 < 12 + program_info_length; i += descriptor_length + 2)
{
descriptor_tag = data[i];
descriptor_length = data[i + 1];
if (descriptor_length < 1)
{
break;
}
if (i + 1 + descriptor_length >= 12 + program_info_length)
{
break;
}
if (descriptor_tag == 0x09 && descriptor_length >= 4)
{
caid = b2i(2, data + i + 2);
if (chk_ctab_ex(caid, &cfg.emu_stream_relay_ctab) && (caid_is_powervu(caid) || caid == 0xA101 || caid_is_icam(caid))) // add all supported caids here
{
if (cdata->caid == NO_CAID_VALUE)
{
cdata->caid = caid;
}
cdata->ecm_pid = b2i(2, data + i + 4) & 0x1FFF;
cs_log_dbg(D_READER, "Stream client %i found ecm pid: 0x%04X (%i)",
cdata->connid, cdata->ecm_pid, cdata->ecm_pid);
break;
}
}
}
for (i = 12 + program_info_length; i + 4 < section_length; i += 5 + es_info_length)
{
stream_type = data[i];
elementary_pid = b2i(2, data + i + 1) & 0x1FFF;
es_info_length = b2i(2, data + i + 3) & 0xFFF;
switch (stream_type)
{
case 0x01:
case 0x02:
case 0x10:
case 0x1B:
case 0x20:
case 0x24:
case 0x25:
case 0x42:
case 0xD1:
case 0xEA:
{
cdata->video_pid = elementary_pid;
cs_log_dbg(D_READER, "Stream client %i found video pid: 0x%04X (%i)",
cdata->connid, elementary_pid, elementary_pid);
break;
}
case 0x03:
case 0x04:
case 0x0F:
case 0x11:
case 0x1C:
case 0x2D:
case 0x2E:
case 0x81:
{
if (cdata->audio_pid_count >= EMU_STREAM_MAX_AUDIO_SUB_TRACKS)
{
continue;
}
cdata->audio_pids[cdata->audio_pid_count] = elementary_pid;
cdata->audio_pid_count++;
cs_log_dbg(D_READER, "Stream client %i found audio pid: 0x%04X (%i)",
cdata->connid, elementary_pid, elementary_pid);
break;
}
case 0x06:
//case 0x81: // some ATSC AC-3 streams do not contain the AC-3 descriptor!
case 0x87:
{
uint8_t type = STREAM_UNDEFINED;
ParseDescriptors(data + i + 5, es_info_length, &type);
if (type == STREAM_AUDIO)
{
if (cdata->audio_pid_count >= EMU_STREAM_MAX_AUDIO_SUB_TRACKS)
{
continue;
}
cdata->audio_pids[cdata->audio_pid_count] = elementary_pid;
cdata->audio_pid_count++;
cs_log_dbg(D_READER, "Stream client %i found audio pid: 0x%04X (%i)",
cdata->connid, elementary_pid, elementary_pid);
}
else if (type == STREAM_TELETEXT)
{
cdata->teletext_pid = elementary_pid;
cs_log_dbg(D_READER, "Stream client %i found teletext pid: 0x%04X (%i)",
cdata->connid, elementary_pid, elementary_pid);
}
break;
}
}
}
// If we haven't found a CAID for this service,
// search the keyDB for a fake one
if (cdata->caid == NO_CAID_VALUE && stream_client_get_caid(cdata) == 1)
{
cs_log_dbg(D_READER, "Stream client %i found fake caid: 0x%04X (%i)",
cdata->connid, cdata->caid, cdata->caid);
}
}
static void ParseCatData(emu_stream_client_data *cdata)
{
uint8_t *data = cdata->cat_data;
uint32_t i;
for (i = 8; i < (b2i(2, data + 1) & 0xFFF) - 1; i += data[i + 1] + 2)
{
if (data[i] != 0x09)
{
continue;
}
uint16_t caid = b2i(2, data + i + 2);
if (caid_is_powervu(caid)) // add all supported caids here
{
if (cdata->caid == NO_CAID_VALUE)
{
cdata->caid = caid;
}
cdata->emm_pid = b2i(2, data + i + 4) & 0x1FFF;;
cs_log_dbg(D_READER, "Stream client %i found emm pid: 0x%04X (%i)",
cdata->connid, cdata->emm_pid, cdata->emm_pid);
break;
}
}
}
static void ParseEmmData(emu_stream_client_data *cdata)
{
uint32_t keysAdded = 0;
emu_process_emm(NULL, cdata->caid, cdata->emm_data, &keysAdded);
if (keysAdded)
{
//refresh_entitlements(rdr);
cs_log("Stream client %i found %i keys", cdata->connid, keysAdded);
}
}
static void ParseEcmData(emu_stream_client_data *cdata)
{
uint8_t *data = cdata->ecm_data;
uint8_t dcw[16];
uint16_t section_length = SCT_LEN(data);
if (section_length < 11)
{
return;
}
if (caid_is_powervu(cdata->caid))
{
if (data[11] > cdata->ecm_nb || (cdata->ecm_nb == 255 && data[11] == 0) || ((cdata->ecm_nb - data[11]) > 5))
{
cdata->ecm_nb = data[11];
powervu_ecm(data, dcw, NULL, cdata->srvid, cdata->caid, cdata->tsid, cdata->onid, cdata->ens, &cdata->key);
}
}
#ifdef MODULE_RADEGAST
else if (caid_is_icam(cdata->caid))
{
icam_ecm(cdata);
}
#endif // MODULE_RADEGAST
//else if () // All other caids
//{
//emu_process_ecm();
//}
}
static void ParseTsPackets(emu_stream_client_data *data, uint8_t *stream_buf, uint32_t bufLength, uint16_t packetSize)
{
uint8_t payloadStart;
uint16_t pid, offset;
uint32_t i, tsHeader;
for (i = 0; i < bufLength; i += packetSize)
{
tsHeader = b2i(4, stream_buf + i);
pid = (tsHeader & 0x1FFF00) >> 8;
payloadStart = (tsHeader & 0x400000) >> 22;
if (tsHeader & 0x20)
{
offset = 4 + stream_buf[i + 4] + 1;
}
else
{
offset = 4;
}
if (packetSize - offset < 1)
{
continue;
}
if (pid == 0x0000 && data->have_pat_data != 1) // Search the PAT for the PMT pid
{
ParseTsData(0x00, 0xFF, 16, &data->have_pat_data, data->pat_data, sizeof(data->pat_data),
&data->pat_data_pos, payloadStart, stream_buf + i + offset, packetSize - offset, ParsePatData, data);
continue;
}
if (pid == data->pmt_pid && data->have_pmt_data != 1) // Search the PMT for PCR, ECM, Video and Audio pids
{
ParseTsData(0x02, 0xFF, 21, &data->have_pmt_data, data->pmt_data, sizeof(data->pmt_data),
&data->pmt_data_pos, payloadStart, stream_buf + i + offset, packetSize - offset, ParsePmtData, data);
continue;
}
// We have bot PAT and PMT data - No need to search the rest of the packets
if (data->have_pat_data == 1 && data->have_pmt_data == 1)
{
break;
}
}
}
static void DescrambleTsPacketsPowervu(emu_stream_client_data *data, uint8_t *stream_buf, uint32_t bufLength, uint16_t packetSize)
{
int8_t oddKeyUsed;
uint8_t scramblingControl, payloadStart, oddeven;
uint8_t *pdata, *packetClusterV[256];
uint8_t *packetClusterA[EMU_STREAM_MAX_AUDIO_SUB_TRACKS][64]; // separate cluster arrays for video and each audio track
uint16_t pid, offset;
uint32_t i, j, k, tsHeader;
uint32_t scrambled_packets = 0, scrambled_packetsA[EMU_STREAM_MAX_AUDIO_SUB_TRACKS] = { 0 };
uint32_t *deskey;
uint32_t cs = 0; // video cluster start
uint32_t ce = 1; // video cluster end
uint32_t csa[EMU_STREAM_MAX_AUDIO_SUB_TRACKS] = { 0 }; // cluster index for audio tracks
void *csakeyA[EMU_STREAM_MAX_AUDIO_SUB_TRACKS] = { 0 };
void *csakeyV = 0;
emu_stream_client_key_data *keydata;
packetClusterV[0] = NULL;
for (i = 0; i < bufLength; i += packetSize)
{
tsHeader = b2i(4, stream_buf + i);
pid = (tsHeader & 0x1FFF00) >> 8;
scramblingControl = tsHeader & 0xC0;
payloadStart = (tsHeader & 0x400000) >> 22;
if (tsHeader & 0x20)
{
offset = 4 + stream_buf[i + 4] + 1;
}
else
{
offset = 4;
}
if (packetSize - offset < 1)
{
continue;
}
if (emu_stream_emm_enabled && pid == 0x0001 && data->have_cat_data != 1) // Search the CAT for EMM pids
{
// set to null pid
stream_buf[i + 1] |= 0x1F;
stream_buf[i + 2] = 0xFF;
ParseTsData(0x01, 0xFF, 8, &data->have_cat_data, data->cat_data, sizeof(data->cat_data),
&data->cat_data_pos, payloadStart, stream_buf + i + offset, packetSize - offset, ParseCatData, data);
continue;
}
if (emu_stream_emm_enabled && data->emm_pid && pid == data->emm_pid) // Process the EMM data
{
// set to null pid
stream_buf[i + 1] |= 0x1F;
stream_buf[i + 2] = 0xFF;
ParseTsData(0x80, 0xF0, 3, &data->have_emm_data, data->emm_data, sizeof(data->emm_data),
&data->emm_data_pos, payloadStart, stream_buf + i + offset, packetSize - offset, ParseEmmData, data);
continue;
}
if (data->ecm_pid && pid == data->ecm_pid) // Process the ECM data
{
stream_server_has_ecm[data->connid] = 1;
// set to null pid
stream_buf[i + 1] |= 0x1F;
stream_buf[i + 2] = 0xFF;
ParseTsData(0x80, 0xFE, 3, &data->have_ecm_data, data->ecm_data, sizeof(data->ecm_data),
&data->ecm_data_pos, payloadStart, stream_buf + i + offset, packetSize - offset, ParseEcmData, data);
continue;
}
if (scramblingControl == 0)
{
continue;
}
if (!(stream_buf[i + 3] & 0x10))
{
stream_buf[i + 3] &= 0x3F;
continue;
}
oddKeyUsed = scramblingControl == 0xC0 ? 1 : 0;
if (!stream_server_has_ecm[data->connid])
{
keydata = &emu_fixed_key_data[data->connid];
SAFE_MUTEX_LOCK(&emu_fixed_key_data_mutex[data->connid]);
data->key.pvu_csa_used = keydata->pvu_csa_used;
}
else
{
keydata = &data->key;
}
if (keydata->pvu_csa_used)
{
oddeven = scramblingControl; // for detecting odd/even switch
if (pid == data->video_pid) // start with video pid, since it is most dominant
{
csakeyV = keydata->pvu_csa_ks[PVU_CW_VID];
if (csakeyV != NULL)
{
cs = 0;
ce = 1;
packetClusterV[cs] = stream_buf + i; // set first cluster start
packetClusterV[ce] = stream_buf + i + packetSize - 1;
scrambled_packets = 1;
// Now iterate through the rest of the packets and create clusters for batch decryption
for (j = i + packetSize; j < bufLength; j += packetSize)
{
tsHeader = b2i(4, stream_buf + j);
pid = (tsHeader & 0x1FFF00) >> 8;
if (pid == data->video_pid)
{
if (oddeven != (tsHeader & 0xC0)) // changed key so stop adding clusters
{
break;
}
if (cs > ce) // First video packet for each cluster
{
packetClusterV[cs] = stream_buf + j;
ce = cs + 1;
}
scrambled_packets++;
}
else
{
if (cs < ce) // First non-video packet - need to set end of video cluster
{
packetClusterV[ce] = stream_buf + j - 1;
cs = ce + 1;
}
if ((tsHeader & 0xC0) == 0)
{
continue;
}
if (oddeven != (tsHeader & 0xC0)) // changed key so stop adding clusters
{
j = bufLength; // to break out of outer loop also
break;
}
// Check for audio tracks and create single packet clusters
for (k = 0; k < data->audio_pid_count; k++)
{
if (pid == data->audio_pids[k])
{
packetClusterA[k][csa[k]] = stream_buf + j;
csa[k]++;
packetClusterA[k][csa[k]] = stream_buf + j + packetSize - 1;
csa[k]++;
scrambled_packetsA[k]++;
}
}
}
}
if (cs > ce) // last packet was not a video packet, so set null for end of all clusters
{
packetClusterV[cs] = NULL;
}
else
{
// last packet was a video packet, so set end of cluster to end of last packet
if (scrambled_packets > 1)
{
packetClusterV[ce] = stream_buf + j - 1;
}
packetClusterV[ce + 1] = NULL; // add null to end of cluster list
}
while (j >= cluster_size)
{
j = decrypt_packets(csakeyV, packetClusterV);
}
for (k = 0; k < data->audio_pid_count; k++)
{
// if audio track has scrambled packets, set null to mark end and decrypt
if (scrambled_packetsA[k])
{
csakeyA[k] = keydata->pvu_csa_ks[PVU_CW_A1 + k];
packetClusterA[k][csa[k]] = NULL;
decrypt_packets(csakeyA[k], packetClusterA[k]);
csa[k] = 0;
scrambled_packetsA[k] = 0;
}
}
}
}
else
{
for (j = 0; j < data->audio_pid_count; j++)
{
if (pid == data->audio_pids[j])
{
csakeyA[0] = keydata->pvu_csa_ks[PVU_CW_A1 + j];
}
}
if (csakeyA[0] != NULL)
{
packetClusterA[0][0] = stream_buf + i;
packetClusterA[0][1] = stream_buf + i + packetSize - 1;
packetClusterA[0][2] = NULL;
decrypt_packets(csakeyA[0], packetClusterA[0]);
}
}
}
else
{
deskey = NULL;
if (pid == data->video_pid)
{
deskey = keydata->pvu_des_ks[PVU_CW_VID][oddKeyUsed];
}
else
{
for (j = 0; j < data->audio_pid_count; j++)
{
if (pid == data->audio_pids[j])
{
deskey = keydata->pvu_des_ks[PVU_CW_A1 + j][oddKeyUsed];
}
}
}
if (deskey == NULL)
{
deskey = keydata->pvu_des_ks[PVU_CW_HSD][oddKeyUsed];
}
for (j = offset; j + 7 < 188; j += 8)
{
pdata = stream_buf + i + j;
des(pdata, deskey, 0);
}
stream_buf[i + 3] &= 0x3F;
}
if (!stream_server_has_ecm[data->connid])
{
SAFE_MUTEX_UNLOCK(&emu_fixed_key_data_mutex[data->connid]);
}
}
}
static void DescrambleTsPacketsRosscrypt1(emu_stream_client_data *data, uint8_t *stream_buf, uint32_t bufLength, uint16_t packetSize)
{
int8_t is_av_pid;
int32_t j;
uint8_t scramblingControl;
uint16_t pid, offset;
uint32_t i, tsHeader;
for (i = 0; i < bufLength; i += packetSize)
{
tsHeader = b2i(4, stream_buf + i);
pid = (tsHeader & 0x1FFF00) >> 8;
scramblingControl = tsHeader & 0xC0;
if (tsHeader & 0x20)
{
offset = 4 + stream_buf[i + 4] + 1;
}
else
{
offset = 4;
}
if (packetSize - offset < 1)
{
continue;
}
if (scramblingControl == 0)
{
continue;
}
if (!(stream_buf[i + 3] & 0x10))
{
stream_buf[i + 3] &= 0x3F;
continue;
}
is_av_pid = 0;
if (pid == data->video_pid)
{
is_av_pid = 1;
}
else
{
for (j = 0; j < data->audio_pid_count; j++)
{
if (pid == data->audio_pids[j])
{
is_av_pid = 1;
break;
}
}
}
if (is_av_pid)
{
static uint8_t dyn_key[184];
static uint8_t last_packet[184];
// Reset key on channel change
if (data->reset_key_data == 1)
{
memset(dyn_key, 0x00, 184);
memset(last_packet, 0x00, 184);
data->reset_key_data = 0;
}
if (memcmp(last_packet, stream_buf + i + 4, 184) == 0)
{
if (memcmp(dyn_key, stream_buf + i + 4, 184) != 0)
{
memcpy(dyn_key, stream_buf + i + 4, 184);
}
}
else
{
memcpy(last_packet, stream_buf + i + 4, 184);
}
for (j = 0; j < 184; j++)
{
stream_buf[i + 4 + j] ^= dyn_key[j];
}
stream_buf[i + 3] &= 0x3F;
}
}
}
static void DescrambleTsPacketsCompel(emu_stream_client_data *data, uint8_t *stream_buf, uint32_t bufLength, uint16_t packetSize)
{
int8_t is_pes_pid; // any PES pid
int32_t j;
const int8_t limit = 4;
uint8_t scramblingControl;
uint16_t pid, offset;
uint32_t i, tsHeader;
for (i = 0; i < bufLength; i += packetSize)
{
tsHeader = b2i(4, stream_buf + i);
pid = (tsHeader & 0x1FFF00) >> 8;
scramblingControl = tsHeader & 0xC0;
if (tsHeader & 0x20)
{
offset = 4 + stream_buf[i + 4] + 1;
}
else
{
offset = 4;
}
if (packetSize - offset < 1)
{
continue;
}
if (scramblingControl == 0)
{
continue;
}
if (!(stream_buf[i + 3] & 0x10))
{
stream_buf[i + 3] &= 0x3F;
continue;
}
is_pes_pid = 0;