1997 lines
52 KiB
C
1997 lines
52 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* This file contains the logic to work with MPEG Program-Specific Information.
|
|
* These are defined both in ISO/IEC 13818-1 (systems) and ETSI EN 300 468.
|
|
* PSI is carried in the form of table structures, and although each table might
|
|
* technically be broken into one or more sections, we do not do this here,
|
|
* hence 'table' and 'section' are interchangeable for vidtv.
|
|
*
|
|
* Copyright (C) 2020 Daniel W. S. Almeida
|
|
*/
|
|
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ":%s, %d: " fmt, __func__, __LINE__
|
|
|
|
#include <linux/bcd.h>
|
|
#include <linux/crc32.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/ktime.h>
|
|
#include <linux/printk.h>
|
|
#include <linux/ratelimit.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/string.h>
|
|
#include <linux/time.h>
|
|
#include <linux/types.h>
|
|
|
|
#include "vidtv_common.h"
|
|
#include "vidtv_psi.h"
|
|
#include "vidtv_ts.h"
|
|
|
|
#define CRC_SIZE_IN_BYTES 4
|
|
#define MAX_VERSION_NUM 32
|
|
#define INITIAL_CRC 0xffffffff
|
|
#define ISO_LANGUAGE_CODE_LEN 3
|
|
|
|
static void vidtv_psi_update_version_num(struct vidtv_psi_table_header *h)
|
|
{
|
|
h->version++;
|
|
}
|
|
|
|
static u16 vidtv_psi_get_sec_len(struct vidtv_psi_table_header *h)
|
|
{
|
|
u16 mask;
|
|
|
|
mask = GENMASK(11, 0);
|
|
|
|
return be16_to_cpu(h->bitfield) & mask;
|
|
}
|
|
|
|
u16 vidtv_psi_get_pat_program_pid(struct vidtv_psi_table_pat_program *p)
|
|
{
|
|
u16 mask;
|
|
|
|
mask = GENMASK(12, 0);
|
|
|
|
return be16_to_cpu(p->bitfield) & mask;
|
|
}
|
|
|
|
u16 vidtv_psi_pmt_stream_get_elem_pid(struct vidtv_psi_table_pmt_stream *s)
|
|
{
|
|
u16 mask;
|
|
|
|
mask = GENMASK(12, 0);
|
|
|
|
return be16_to_cpu(s->bitfield) & mask;
|
|
}
|
|
|
|
static void vidtv_psi_set_desc_loop_len(__be16 *bitfield, u16 new_len,
|
|
u8 desc_len_nbits)
|
|
{
|
|
__be16 new;
|
|
u16 mask;
|
|
|
|
mask = GENMASK(15, desc_len_nbits);
|
|
|
|
new = cpu_to_be16((be16_to_cpu(*bitfield) & mask) | new_len);
|
|
*bitfield = new;
|
|
}
|
|
|
|
static void vidtv_psi_set_sec_len(struct vidtv_psi_table_header *h, u16 new_len)
|
|
{
|
|
u16 old_len = vidtv_psi_get_sec_len(h);
|
|
__be16 new;
|
|
u16 mask;
|
|
|
|
mask = GENMASK(15, 13);
|
|
|
|
new = cpu_to_be16((be16_to_cpu(h->bitfield) & mask) | new_len);
|
|
|
|
if (old_len > MAX_SECTION_LEN)
|
|
pr_warn_ratelimited("section length: %d > %d, old len was %d\n",
|
|
new_len,
|
|
MAX_SECTION_LEN,
|
|
old_len);
|
|
|
|
h->bitfield = new;
|
|
}
|
|
|
|
/*
|
|
* Packetize PSI sections into TS packets:
|
|
* push a TS header (4bytes) every 184 bytes
|
|
* manage the continuity_counter
|
|
* add stuffing (i.e. padding bytes) after the CRC
|
|
*/
|
|
static u32 vidtv_psi_ts_psi_write_into(struct psi_write_args *args)
|
|
{
|
|
struct vidtv_mpeg_ts ts_header = {
|
|
.sync_byte = TS_SYNC_BYTE,
|
|
.bitfield = cpu_to_be16((args->new_psi_section << 14) | args->pid),
|
|
.scrambling = 0,
|
|
.payload = 1,
|
|
.adaptation_field = 0, /* no adaptation field */
|
|
};
|
|
u32 nbytes_past_boundary = (args->dest_offset % TS_PACKET_LEN);
|
|
bool aligned = (nbytes_past_boundary == 0);
|
|
u32 remaining_len = args->len;
|
|
u32 payload_write_len = 0;
|
|
u32 payload_offset = 0;
|
|
u32 nbytes = 0;
|
|
|
|
if (!args->crc && !args->is_crc)
|
|
pr_warn_ratelimited("Missing CRC for chunk\n");
|
|
|
|
if (args->crc)
|
|
*args->crc = crc32_be(*args->crc, args->from, args->len);
|
|
|
|
if (args->new_psi_section && !aligned) {
|
|
pr_warn_ratelimited("Cannot write a new PSI section in a misaligned buffer\n");
|
|
|
|
/* forcibly align and hope for the best */
|
|
nbytes += vidtv_memset(args->dest_buf,
|
|
args->dest_offset + nbytes,
|
|
args->dest_buf_sz,
|
|
TS_FILL_BYTE,
|
|
TS_PACKET_LEN - nbytes_past_boundary);
|
|
}
|
|
|
|
while (remaining_len) {
|
|
nbytes_past_boundary = (args->dest_offset + nbytes) % TS_PACKET_LEN;
|
|
aligned = (nbytes_past_boundary == 0);
|
|
|
|
if (aligned) {
|
|
/* if at a packet boundary, write a new TS header */
|
|
ts_header.continuity_counter = *args->continuity_counter;
|
|
|
|
nbytes += vidtv_memcpy(args->dest_buf,
|
|
args->dest_offset + nbytes,
|
|
args->dest_buf_sz,
|
|
&ts_header,
|
|
sizeof(ts_header));
|
|
/*
|
|
* This will trigger a discontinuity if the buffer is full,
|
|
* effectively dropping the packet.
|
|
*/
|
|
vidtv_ts_inc_cc(args->continuity_counter);
|
|
}
|
|
|
|
/* write the pointer_field in the first byte of the payload */
|
|
if (args->new_psi_section)
|
|
nbytes += vidtv_memset(args->dest_buf,
|
|
args->dest_offset + nbytes,
|
|
args->dest_buf_sz,
|
|
0x0,
|
|
1);
|
|
|
|
/* write as much of the payload as possible */
|
|
nbytes_past_boundary = (args->dest_offset + nbytes) % TS_PACKET_LEN;
|
|
payload_write_len = min(TS_PACKET_LEN - nbytes_past_boundary, remaining_len);
|
|
|
|
nbytes += vidtv_memcpy(args->dest_buf,
|
|
args->dest_offset + nbytes,
|
|
args->dest_buf_sz,
|
|
args->from + payload_offset,
|
|
payload_write_len);
|
|
|
|
/* 'payload_write_len' written from a total of 'len' requested*/
|
|
remaining_len -= payload_write_len;
|
|
payload_offset += payload_write_len;
|
|
}
|
|
|
|
/*
|
|
* fill the rest of the packet if there is any remaining space unused
|
|
*/
|
|
|
|
nbytes_past_boundary = (args->dest_offset + nbytes) % TS_PACKET_LEN;
|
|
|
|
if (args->is_crc)
|
|
nbytes += vidtv_memset(args->dest_buf,
|
|
args->dest_offset + nbytes,
|
|
args->dest_buf_sz,
|
|
TS_FILL_BYTE,
|
|
TS_PACKET_LEN - nbytes_past_boundary);
|
|
|
|
return nbytes;
|
|
}
|
|
|
|
static u32 table_section_crc32_write_into(struct crc32_write_args *args)
|
|
{
|
|
struct psi_write_args psi_args = {
|
|
.dest_buf = args->dest_buf,
|
|
.from = &args->crc,
|
|
.len = CRC_SIZE_IN_BYTES,
|
|
.dest_offset = args->dest_offset,
|
|
.pid = args->pid,
|
|
.new_psi_section = false,
|
|
.continuity_counter = args->continuity_counter,
|
|
.is_crc = true,
|
|
.dest_buf_sz = args->dest_buf_sz,
|
|
};
|
|
|
|
/* the CRC is the last entry in the section */
|
|
|
|
return vidtv_psi_ts_psi_write_into(&psi_args);
|
|
}
|
|
|
|
static void vidtv_psi_desc_chain(struct vidtv_psi_desc *head, struct vidtv_psi_desc *desc)
|
|
{
|
|
if (head) {
|
|
while (head->next)
|
|
head = head->next;
|
|
|
|
head->next = desc;
|
|
}
|
|
}
|
|
|
|
struct vidtv_psi_desc_service *vidtv_psi_service_desc_init(struct vidtv_psi_desc *head,
|
|
enum service_type service_type,
|
|
char *service_name,
|
|
char *provider_name)
|
|
{
|
|
struct vidtv_psi_desc_service *desc;
|
|
u32 service_name_len = service_name ? strlen(service_name) : 0;
|
|
u32 provider_name_len = provider_name ? strlen(provider_name) : 0;
|
|
|
|
desc = kzalloc_obj(*desc);
|
|
if (!desc)
|
|
return NULL;
|
|
|
|
desc->type = SERVICE_DESCRIPTOR;
|
|
|
|
desc->length = sizeof_field(struct vidtv_psi_desc_service, service_type)
|
|
+ sizeof_field(struct vidtv_psi_desc_service, provider_name_len)
|
|
+ provider_name_len
|
|
+ sizeof_field(struct vidtv_psi_desc_service, service_name_len)
|
|
+ service_name_len;
|
|
|
|
desc->service_type = service_type;
|
|
|
|
desc->service_name_len = service_name_len;
|
|
|
|
if (service_name && service_name_len) {
|
|
desc->service_name = kstrdup(service_name, GFP_KERNEL);
|
|
if (!desc->service_name)
|
|
goto free_desc;
|
|
}
|
|
|
|
desc->provider_name_len = provider_name_len;
|
|
|
|
if (provider_name && provider_name_len) {
|
|
desc->provider_name = kstrdup(provider_name, GFP_KERNEL);
|
|
if (!desc->provider_name)
|
|
goto free_desc_service_name;
|
|
}
|
|
|
|
vidtv_psi_desc_chain(head, (struct vidtv_psi_desc *)desc);
|
|
return desc;
|
|
|
|
free_desc_service_name:
|
|
if (service_name && service_name_len)
|
|
kfree(desc->service_name);
|
|
free_desc:
|
|
kfree(desc);
|
|
return NULL;
|
|
}
|
|
|
|
struct vidtv_psi_desc_registration
|
|
*vidtv_psi_registration_desc_init(struct vidtv_psi_desc *head,
|
|
__be32 format_id,
|
|
u8 *additional_ident_info,
|
|
u32 additional_info_len)
|
|
{
|
|
struct vidtv_psi_desc_registration *desc;
|
|
|
|
desc = kzalloc(sizeof(*desc) + sizeof(format_id) + additional_info_len, GFP_KERNEL);
|
|
if (!desc)
|
|
return NULL;
|
|
|
|
desc->type = REGISTRATION_DESCRIPTOR;
|
|
|
|
desc->length = sizeof_field(struct vidtv_psi_desc_registration, format_id)
|
|
+ additional_info_len;
|
|
|
|
desc->format_id = format_id;
|
|
|
|
if (additional_ident_info && additional_info_len)
|
|
memcpy(desc->additional_identification_info,
|
|
additional_ident_info,
|
|
additional_info_len);
|
|
|
|
vidtv_psi_desc_chain(head, (struct vidtv_psi_desc *)desc);
|
|
return desc;
|
|
}
|
|
|
|
struct vidtv_psi_desc_network_name
|
|
*vidtv_psi_network_name_desc_init(struct vidtv_psi_desc *head, char *network_name)
|
|
{
|
|
u32 network_name_len = network_name ? strlen(network_name) : 0;
|
|
struct vidtv_psi_desc_network_name *desc;
|
|
|
|
desc = kzalloc_obj(*desc);
|
|
if (!desc)
|
|
return NULL;
|
|
|
|
desc->type = NETWORK_NAME_DESCRIPTOR;
|
|
|
|
desc->length = network_name_len;
|
|
|
|
if (network_name && network_name_len) {
|
|
desc->network_name = kstrdup(network_name, GFP_KERNEL);
|
|
if (!desc->network_name) {
|
|
kfree(desc);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
vidtv_psi_desc_chain(head, (struct vidtv_psi_desc *)desc);
|
|
return desc;
|
|
}
|
|
|
|
struct vidtv_psi_desc_service_list
|
|
*vidtv_psi_service_list_desc_init(struct vidtv_psi_desc *head,
|
|
struct vidtv_psi_desc_service_list_entry *entry)
|
|
{
|
|
struct vidtv_psi_desc_service_list_entry *curr_e = NULL;
|
|
struct vidtv_psi_desc_service_list_entry *head_e = NULL;
|
|
struct vidtv_psi_desc_service_list_entry *prev_e = NULL;
|
|
struct vidtv_psi_desc_service_list *desc;
|
|
u16 length = 0;
|
|
|
|
desc = kzalloc_obj(*desc);
|
|
if (!desc)
|
|
return NULL;
|
|
|
|
desc->type = SERVICE_LIST_DESCRIPTOR;
|
|
|
|
while (entry) {
|
|
curr_e = kzalloc_obj(*curr_e);
|
|
if (!curr_e) {
|
|
while (head_e) {
|
|
curr_e = head_e;
|
|
head_e = head_e->next;
|
|
kfree(curr_e);
|
|
}
|
|
kfree(desc);
|
|
return NULL;
|
|
}
|
|
|
|
curr_e->service_id = entry->service_id;
|
|
curr_e->service_type = entry->service_type;
|
|
|
|
length += sizeof(struct vidtv_psi_desc_service_list_entry) -
|
|
sizeof(struct vidtv_psi_desc_service_list_entry *);
|
|
|
|
if (!head_e)
|
|
head_e = curr_e;
|
|
if (prev_e)
|
|
prev_e->next = curr_e;
|
|
|
|
prev_e = curr_e;
|
|
entry = entry->next;
|
|
}
|
|
|
|
desc->length = length;
|
|
desc->service_list = head_e;
|
|
|
|
vidtv_psi_desc_chain(head, (struct vidtv_psi_desc *)desc);
|
|
return desc;
|
|
}
|
|
|
|
struct vidtv_psi_desc_short_event
|
|
*vidtv_psi_short_event_desc_init(struct vidtv_psi_desc *head,
|
|
char *iso_language_code,
|
|
char *event_name,
|
|
char *text)
|
|
{
|
|
u32 iso_len = iso_language_code ? strlen(iso_language_code) : 0;
|
|
u32 event_name_len = event_name ? strlen(event_name) : 0;
|
|
struct vidtv_psi_desc_short_event *desc;
|
|
u32 text_len = text ? strlen(text) : 0;
|
|
|
|
desc = kzalloc_obj(*desc);
|
|
if (!desc)
|
|
return NULL;
|
|
|
|
desc->type = SHORT_EVENT_DESCRIPTOR;
|
|
|
|
desc->length = ISO_LANGUAGE_CODE_LEN +
|
|
sizeof_field(struct vidtv_psi_desc_short_event, event_name_len) +
|
|
event_name_len +
|
|
sizeof_field(struct vidtv_psi_desc_short_event, text_len) +
|
|
text_len;
|
|
|
|
desc->event_name_len = event_name_len;
|
|
desc->text_len = text_len;
|
|
|
|
if (iso_len != ISO_LANGUAGE_CODE_LEN)
|
|
iso_language_code = "eng";
|
|
|
|
desc->iso_language_code = kstrdup(iso_language_code, GFP_KERNEL);
|
|
if (!desc->iso_language_code)
|
|
goto free_desc;
|
|
|
|
if (event_name && event_name_len) {
|
|
desc->event_name = kstrdup(event_name, GFP_KERNEL);
|
|
if (!desc->event_name)
|
|
goto free_desc_language_code;
|
|
}
|
|
|
|
if (text && text_len) {
|
|
desc->text = kstrdup(text, GFP_KERNEL);
|
|
if (!desc->text)
|
|
goto free_desc_event_name;
|
|
}
|
|
|
|
vidtv_psi_desc_chain(head, (struct vidtv_psi_desc *)desc);
|
|
return desc;
|
|
|
|
free_desc_event_name:
|
|
if (event_name && event_name_len)
|
|
kfree(desc->event_name);
|
|
free_desc_language_code:
|
|
kfree(desc->iso_language_code);
|
|
free_desc:
|
|
kfree(desc);
|
|
return NULL;
|
|
}
|
|
|
|
struct vidtv_psi_desc *vidtv_psi_desc_clone(struct vidtv_psi_desc *desc)
|
|
{
|
|
struct vidtv_psi_desc_network_name *desc_network_name;
|
|
struct vidtv_psi_desc_service_list *desc_service_list;
|
|
struct vidtv_psi_desc_short_event *desc_short_event;
|
|
struct vidtv_psi_desc_service *service;
|
|
struct vidtv_psi_desc *head = NULL;
|
|
struct vidtv_psi_desc *prev = NULL;
|
|
struct vidtv_psi_desc *curr = NULL;
|
|
|
|
while (desc) {
|
|
switch (desc->type) {
|
|
case SERVICE_DESCRIPTOR:
|
|
service = (struct vidtv_psi_desc_service *)desc;
|
|
curr = (struct vidtv_psi_desc *)
|
|
vidtv_psi_service_desc_init(head,
|
|
service->service_type,
|
|
service->service_name,
|
|
service->provider_name);
|
|
break;
|
|
|
|
case NETWORK_NAME_DESCRIPTOR:
|
|
desc_network_name = (struct vidtv_psi_desc_network_name *)desc;
|
|
curr = (struct vidtv_psi_desc *)
|
|
vidtv_psi_network_name_desc_init(head,
|
|
desc_network_name->network_name);
|
|
break;
|
|
|
|
case SERVICE_LIST_DESCRIPTOR:
|
|
desc_service_list = (struct vidtv_psi_desc_service_list *)desc;
|
|
curr = (struct vidtv_psi_desc *)
|
|
vidtv_psi_service_list_desc_init(head,
|
|
desc_service_list->service_list);
|
|
break;
|
|
|
|
case SHORT_EVENT_DESCRIPTOR:
|
|
desc_short_event = (struct vidtv_psi_desc_short_event *)desc;
|
|
curr = (struct vidtv_psi_desc *)
|
|
vidtv_psi_short_event_desc_init(head,
|
|
desc_short_event->iso_language_code,
|
|
desc_short_event->event_name,
|
|
desc_short_event->text);
|
|
break;
|
|
|
|
case REGISTRATION_DESCRIPTOR:
|
|
default:
|
|
curr = kmemdup(desc, sizeof(*desc) + desc->length, GFP_KERNEL);
|
|
if (!curr)
|
|
return NULL;
|
|
}
|
|
|
|
if (!curr)
|
|
return NULL;
|
|
|
|
curr->next = NULL;
|
|
if (!head)
|
|
head = curr;
|
|
if (prev)
|
|
prev->next = curr;
|
|
|
|
prev = curr;
|
|
desc = desc->next;
|
|
}
|
|
|
|
return head;
|
|
}
|
|
|
|
void vidtv_psi_desc_destroy(struct vidtv_psi_desc *desc)
|
|
{
|
|
struct vidtv_psi_desc_service_list_entry *sl_entry_tmp = NULL;
|
|
struct vidtv_psi_desc_service_list_entry *sl_entry = NULL;
|
|
struct vidtv_psi_desc *curr = desc;
|
|
struct vidtv_psi_desc *tmp = NULL;
|
|
|
|
while (curr) {
|
|
tmp = curr;
|
|
curr = curr->next;
|
|
|
|
switch (tmp->type) {
|
|
case SERVICE_DESCRIPTOR:
|
|
kfree(((struct vidtv_psi_desc_service *)tmp)->provider_name);
|
|
kfree(((struct vidtv_psi_desc_service *)tmp)->service_name);
|
|
|
|
break;
|
|
case REGISTRATION_DESCRIPTOR:
|
|
/* nothing to do */
|
|
break;
|
|
|
|
case NETWORK_NAME_DESCRIPTOR:
|
|
kfree(((struct vidtv_psi_desc_network_name *)tmp)->network_name);
|
|
break;
|
|
|
|
case SERVICE_LIST_DESCRIPTOR:
|
|
sl_entry = ((struct vidtv_psi_desc_service_list *)tmp)->service_list;
|
|
while (sl_entry) {
|
|
sl_entry_tmp = sl_entry;
|
|
sl_entry = sl_entry->next;
|
|
kfree(sl_entry_tmp);
|
|
}
|
|
break;
|
|
|
|
case SHORT_EVENT_DESCRIPTOR:
|
|
kfree(((struct vidtv_psi_desc_short_event *)tmp)->iso_language_code);
|
|
kfree(((struct vidtv_psi_desc_short_event *)tmp)->event_name);
|
|
kfree(((struct vidtv_psi_desc_short_event *)tmp)->text);
|
|
break;
|
|
|
|
default:
|
|
pr_warn_ratelimited("Possible leak: not handling descriptor type %d\n",
|
|
tmp->type);
|
|
break;
|
|
}
|
|
|
|
kfree(tmp);
|
|
}
|
|
}
|
|
|
|
static u16
|
|
vidtv_psi_desc_comp_loop_len(struct vidtv_psi_desc *desc)
|
|
{
|
|
u32 length = 0;
|
|
|
|
if (!desc)
|
|
return 0;
|
|
|
|
while (desc) {
|
|
length += sizeof_field(struct vidtv_psi_desc, type);
|
|
length += sizeof_field(struct vidtv_psi_desc, length);
|
|
length += desc->length; /* from 'length' field until the end of the descriptor */
|
|
desc = desc->next;
|
|
}
|
|
|
|
return length;
|
|
}
|
|
|
|
void vidtv_psi_desc_assign(struct vidtv_psi_desc **to,
|
|
struct vidtv_psi_desc *desc)
|
|
{
|
|
if (desc == *to)
|
|
return;
|
|
|
|
if (*to)
|
|
vidtv_psi_desc_destroy(*to);
|
|
|
|
*to = desc;
|
|
}
|
|
|
|
void vidtv_pmt_desc_assign(struct vidtv_psi_table_pmt *pmt,
|
|
struct vidtv_psi_desc **to,
|
|
struct vidtv_psi_desc *desc)
|
|
{
|
|
vidtv_psi_desc_assign(to, desc);
|
|
vidtv_psi_pmt_table_update_sec_len(pmt);
|
|
|
|
if (vidtv_psi_get_sec_len(&pmt->header) > MAX_SECTION_LEN)
|
|
vidtv_psi_desc_assign(to, NULL);
|
|
|
|
vidtv_psi_update_version_num(&pmt->header);
|
|
}
|
|
|
|
void vidtv_sdt_desc_assign(struct vidtv_psi_table_sdt *sdt,
|
|
struct vidtv_psi_desc **to,
|
|
struct vidtv_psi_desc *desc)
|
|
{
|
|
vidtv_psi_desc_assign(to, desc);
|
|
vidtv_psi_sdt_table_update_sec_len(sdt);
|
|
|
|
if (vidtv_psi_get_sec_len(&sdt->header) > MAX_SECTION_LEN)
|
|
vidtv_psi_desc_assign(to, NULL);
|
|
|
|
vidtv_psi_update_version_num(&sdt->header);
|
|
}
|
|
|
|
static u32 vidtv_psi_desc_write_into(struct desc_write_args *args)
|
|
{
|
|
struct psi_write_args psi_args = {
|
|
.dest_buf = args->dest_buf,
|
|
.from = &args->desc->type,
|
|
.pid = args->pid,
|
|
.new_psi_section = false,
|
|
.continuity_counter = args->continuity_counter,
|
|
.is_crc = false,
|
|
.dest_buf_sz = args->dest_buf_sz,
|
|
.crc = args->crc,
|
|
.len = sizeof_field(struct vidtv_psi_desc, type) +
|
|
sizeof_field(struct vidtv_psi_desc, length),
|
|
};
|
|
struct vidtv_psi_desc_service_list_entry *serv_list_entry = NULL;
|
|
u32 nbytes = 0;
|
|
|
|
psi_args.dest_offset = args->dest_offset + nbytes;
|
|
|
|
nbytes += vidtv_psi_ts_psi_write_into(&psi_args);
|
|
|
|
switch (args->desc->type) {
|
|
case SERVICE_DESCRIPTOR:
|
|
psi_args.dest_offset = args->dest_offset + nbytes;
|
|
psi_args.len = sizeof_field(struct vidtv_psi_desc_service, service_type) +
|
|
sizeof_field(struct vidtv_psi_desc_service, provider_name_len);
|
|
psi_args.from = &((struct vidtv_psi_desc_service *)args->desc)->service_type;
|
|
|
|
nbytes += vidtv_psi_ts_psi_write_into(&psi_args);
|
|
|
|
psi_args.dest_offset = args->dest_offset + nbytes;
|
|
psi_args.len = ((struct vidtv_psi_desc_service *)args->desc)->provider_name_len;
|
|
psi_args.from = ((struct vidtv_psi_desc_service *)args->desc)->provider_name;
|
|
|
|
nbytes += vidtv_psi_ts_psi_write_into(&psi_args);
|
|
|
|
psi_args.dest_offset = args->dest_offset + nbytes;
|
|
psi_args.len = sizeof_field(struct vidtv_psi_desc_service, service_name_len);
|
|
psi_args.from = &((struct vidtv_psi_desc_service *)args->desc)->service_name_len;
|
|
|
|
nbytes += vidtv_psi_ts_psi_write_into(&psi_args);
|
|
|
|
psi_args.dest_offset = args->dest_offset + nbytes;
|
|
psi_args.len = ((struct vidtv_psi_desc_service *)args->desc)->service_name_len;
|
|
psi_args.from = ((struct vidtv_psi_desc_service *)args->desc)->service_name;
|
|
|
|
nbytes += vidtv_psi_ts_psi_write_into(&psi_args);
|
|
break;
|
|
|
|
case NETWORK_NAME_DESCRIPTOR:
|
|
psi_args.dest_offset = args->dest_offset + nbytes;
|
|
psi_args.len = args->desc->length;
|
|
psi_args.from = ((struct vidtv_psi_desc_network_name *)args->desc)->network_name;
|
|
|
|
nbytes += vidtv_psi_ts_psi_write_into(&psi_args);
|
|
break;
|
|
|
|
case SERVICE_LIST_DESCRIPTOR:
|
|
serv_list_entry = ((struct vidtv_psi_desc_service_list *)args->desc)->service_list;
|
|
while (serv_list_entry) {
|
|
psi_args.dest_offset = args->dest_offset + nbytes;
|
|
psi_args.len = sizeof(struct vidtv_psi_desc_service_list_entry) -
|
|
sizeof(struct vidtv_psi_desc_service_list_entry *);
|
|
psi_args.from = serv_list_entry;
|
|
|
|
nbytes += vidtv_psi_ts_psi_write_into(&psi_args);
|
|
|
|
serv_list_entry = serv_list_entry->next;
|
|
}
|
|
break;
|
|
|
|
case SHORT_EVENT_DESCRIPTOR:
|
|
psi_args.dest_offset = args->dest_offset + nbytes;
|
|
psi_args.len = ISO_LANGUAGE_CODE_LEN;
|
|
psi_args.from = ((struct vidtv_psi_desc_short_event *)
|
|
args->desc)->iso_language_code;
|
|
|
|
nbytes += vidtv_psi_ts_psi_write_into(&psi_args);
|
|
|
|
psi_args.dest_offset = args->dest_offset + nbytes;
|
|
psi_args.len = sizeof_field(struct vidtv_psi_desc_short_event, event_name_len);
|
|
psi_args.from = &((struct vidtv_psi_desc_short_event *)
|
|
args->desc)->event_name_len;
|
|
|
|
nbytes += vidtv_psi_ts_psi_write_into(&psi_args);
|
|
|
|
psi_args.dest_offset = args->dest_offset + nbytes;
|
|
psi_args.len = ((struct vidtv_psi_desc_short_event *)args->desc)->event_name_len;
|
|
psi_args.from = ((struct vidtv_psi_desc_short_event *)args->desc)->event_name;
|
|
|
|
nbytes += vidtv_psi_ts_psi_write_into(&psi_args);
|
|
|
|
psi_args.dest_offset = args->dest_offset + nbytes;
|
|
psi_args.len = sizeof_field(struct vidtv_psi_desc_short_event, text_len);
|
|
psi_args.from = &((struct vidtv_psi_desc_short_event *)args->desc)->text_len;
|
|
|
|
nbytes += vidtv_psi_ts_psi_write_into(&psi_args);
|
|
|
|
psi_args.dest_offset = args->dest_offset + nbytes;
|
|
psi_args.len = ((struct vidtv_psi_desc_short_event *)args->desc)->text_len;
|
|
psi_args.from = ((struct vidtv_psi_desc_short_event *)args->desc)->text;
|
|
|
|
nbytes += vidtv_psi_ts_psi_write_into(&psi_args);
|
|
|
|
break;
|
|
|
|
case REGISTRATION_DESCRIPTOR:
|
|
default:
|
|
psi_args.dest_offset = args->dest_offset + nbytes;
|
|
psi_args.len = args->desc->length;
|
|
psi_args.from = &args->desc->data;
|
|
|
|
nbytes += vidtv_psi_ts_psi_write_into(&psi_args);
|
|
break;
|
|
}
|
|
|
|
return nbytes;
|
|
}
|
|
|
|
static u32
|
|
vidtv_psi_table_header_write_into(struct header_write_args *args)
|
|
{
|
|
struct psi_write_args psi_args = {
|
|
.dest_buf = args->dest_buf,
|
|
.from = args->h,
|
|
.len = sizeof(struct vidtv_psi_table_header),
|
|
.dest_offset = args->dest_offset,
|
|
.pid = args->pid,
|
|
.new_psi_section = true,
|
|
.continuity_counter = args->continuity_counter,
|
|
.is_crc = false,
|
|
.dest_buf_sz = args->dest_buf_sz,
|
|
.crc = args->crc,
|
|
};
|
|
|
|
return vidtv_psi_ts_psi_write_into(&psi_args);
|
|
}
|
|
|
|
void
|
|
vidtv_psi_pat_table_update_sec_len(struct vidtv_psi_table_pat *pat)
|
|
{
|
|
u16 length = 0;
|
|
u32 i;
|
|
|
|
/* see ISO/IEC 13818-1 : 2000 p.43 */
|
|
|
|
/* from immediately after 'section_length' until 'last_section_number'*/
|
|
length += PAT_LEN_UNTIL_LAST_SECTION_NUMBER;
|
|
|
|
/* do not count the pointer */
|
|
for (i = 0; i < pat->num_pat; ++i)
|
|
length += sizeof(struct vidtv_psi_table_pat_program) -
|
|
sizeof(struct vidtv_psi_table_pat_program *);
|
|
|
|
length += CRC_SIZE_IN_BYTES;
|
|
|
|
vidtv_psi_set_sec_len(&pat->header, length);
|
|
}
|
|
|
|
void vidtv_psi_pmt_table_update_sec_len(struct vidtv_psi_table_pmt *pmt)
|
|
{
|
|
struct vidtv_psi_table_pmt_stream *s = pmt->stream;
|
|
u16 desc_loop_len;
|
|
u16 length = 0;
|
|
|
|
/* see ISO/IEC 13818-1 : 2000 p.46 */
|
|
|
|
/* from immediately after 'section_length' until 'program_info_length'*/
|
|
length += PMT_LEN_UNTIL_PROGRAM_INFO_LENGTH;
|
|
|
|
desc_loop_len = vidtv_psi_desc_comp_loop_len(pmt->descriptor);
|
|
vidtv_psi_set_desc_loop_len(&pmt->bitfield2, desc_loop_len, 10);
|
|
|
|
length += desc_loop_len;
|
|
|
|
while (s) {
|
|
/* skip both pointers at the end */
|
|
length += sizeof(struct vidtv_psi_table_pmt_stream) -
|
|
sizeof(struct vidtv_psi_desc *) -
|
|
sizeof(struct vidtv_psi_table_pmt_stream *);
|
|
|
|
desc_loop_len = vidtv_psi_desc_comp_loop_len(s->descriptor);
|
|
vidtv_psi_set_desc_loop_len(&s->bitfield2, desc_loop_len, 10);
|
|
|
|
length += desc_loop_len;
|
|
|
|
s = s->next;
|
|
}
|
|
|
|
length += CRC_SIZE_IN_BYTES;
|
|
|
|
vidtv_psi_set_sec_len(&pmt->header, length);
|
|
}
|
|
|
|
void vidtv_psi_sdt_table_update_sec_len(struct vidtv_psi_table_sdt *sdt)
|
|
{
|
|
struct vidtv_psi_table_sdt_service *s = sdt->service;
|
|
u16 desc_loop_len;
|
|
u16 length = 0;
|
|
|
|
/* see ETSI EN 300 468 V 1.10.1 p.24 */
|
|
|
|
/*
|
|
* from immediately after 'section_length' until
|
|
* 'reserved_for_future_use'
|
|
*/
|
|
length += SDT_LEN_UNTIL_RESERVED_FOR_FUTURE_USE;
|
|
|
|
while (s) {
|
|
/* skip both pointers at the end */
|
|
length += sizeof(struct vidtv_psi_table_sdt_service) -
|
|
sizeof(struct vidtv_psi_desc *) -
|
|
sizeof(struct vidtv_psi_table_sdt_service *);
|
|
|
|
desc_loop_len = vidtv_psi_desc_comp_loop_len(s->descriptor);
|
|
vidtv_psi_set_desc_loop_len(&s->bitfield, desc_loop_len, 12);
|
|
|
|
length += desc_loop_len;
|
|
|
|
s = s->next;
|
|
}
|
|
|
|
length += CRC_SIZE_IN_BYTES;
|
|
vidtv_psi_set_sec_len(&sdt->header, length);
|
|
}
|
|
|
|
struct vidtv_psi_table_pat_program*
|
|
vidtv_psi_pat_program_init(struct vidtv_psi_table_pat_program *head,
|
|
u16 service_id,
|
|
u16 program_map_pid)
|
|
{
|
|
struct vidtv_psi_table_pat_program *program;
|
|
const u16 RESERVED = 0x07;
|
|
|
|
program = kzalloc_obj(*program);
|
|
if (!program)
|
|
return NULL;
|
|
|
|
program->service_id = cpu_to_be16(service_id);
|
|
|
|
/* pid for the PMT section in the TS */
|
|
program->bitfield = cpu_to_be16((RESERVED << 13) | program_map_pid);
|
|
program->next = NULL;
|
|
|
|
if (head) {
|
|
while (head->next)
|
|
head = head->next;
|
|
|
|
head->next = program;
|
|
}
|
|
|
|
return program;
|
|
}
|
|
|
|
void
|
|
vidtv_psi_pat_program_destroy(struct vidtv_psi_table_pat_program *p)
|
|
{
|
|
struct vidtv_psi_table_pat_program *tmp = NULL;
|
|
struct vidtv_psi_table_pat_program *curr = p;
|
|
|
|
while (curr) {
|
|
tmp = curr;
|
|
curr = curr->next;
|
|
kfree(tmp);
|
|
}
|
|
}
|
|
|
|
/* This function transfers ownership of p to the table */
|
|
void
|
|
vidtv_psi_pat_program_assign(struct vidtv_psi_table_pat *pat,
|
|
struct vidtv_psi_table_pat_program *p)
|
|
{
|
|
struct vidtv_psi_table_pat_program *program;
|
|
u16 program_count;
|
|
|
|
do {
|
|
program_count = 0;
|
|
program = p;
|
|
|
|
if (p == pat->program)
|
|
return;
|
|
|
|
while (program) {
|
|
++program_count;
|
|
program = program->next;
|
|
}
|
|
|
|
pat->num_pat = program_count;
|
|
pat->program = p;
|
|
|
|
/* Recompute section length */
|
|
vidtv_psi_pat_table_update_sec_len(pat);
|
|
|
|
p = NULL;
|
|
} while (vidtv_psi_get_sec_len(&pat->header) > MAX_SECTION_LEN);
|
|
|
|
vidtv_psi_update_version_num(&pat->header);
|
|
}
|
|
|
|
struct vidtv_psi_table_pat *vidtv_psi_pat_table_init(u16 transport_stream_id)
|
|
{
|
|
struct vidtv_psi_table_pat *pat;
|
|
const u16 SYNTAX = 0x1;
|
|
const u16 ZERO = 0x0;
|
|
const u16 ONES = 0x03;
|
|
|
|
pat = kzalloc_obj(*pat);
|
|
if (!pat)
|
|
return NULL;
|
|
|
|
pat->header.table_id = 0x0;
|
|
|
|
pat->header.bitfield = cpu_to_be16((SYNTAX << 15) | (ZERO << 14) | (ONES << 12));
|
|
pat->header.id = cpu_to_be16(transport_stream_id);
|
|
pat->header.current_next = 0x1;
|
|
|
|
pat->header.version = 0x1f;
|
|
|
|
pat->header.one2 = 0x03;
|
|
pat->header.section_id = 0x0;
|
|
pat->header.last_section = 0x0;
|
|
|
|
vidtv_psi_pat_table_update_sec_len(pat);
|
|
|
|
return pat;
|
|
}
|
|
|
|
u32 vidtv_psi_pat_write_into(struct vidtv_psi_pat_write_args *args)
|
|
{
|
|
struct vidtv_psi_table_pat_program *p = args->pat->program;
|
|
struct header_write_args h_args = {
|
|
.dest_buf = args->buf,
|
|
.dest_offset = args->offset,
|
|
.pid = VIDTV_PAT_PID,
|
|
.h = &args->pat->header,
|
|
.continuity_counter = args->continuity_counter,
|
|
.dest_buf_sz = args->buf_sz,
|
|
};
|
|
struct psi_write_args psi_args = {
|
|
.dest_buf = args->buf,
|
|
.pid = VIDTV_PAT_PID,
|
|
.new_psi_section = false,
|
|
.continuity_counter = args->continuity_counter,
|
|
.is_crc = false,
|
|
.dest_buf_sz = args->buf_sz,
|
|
};
|
|
struct crc32_write_args c_args = {
|
|
.dest_buf = args->buf,
|
|
.pid = VIDTV_PAT_PID,
|
|
.dest_buf_sz = args->buf_sz,
|
|
};
|
|
u32 crc = INITIAL_CRC;
|
|
u32 nbytes = 0;
|
|
|
|
vidtv_psi_pat_table_update_sec_len(args->pat);
|
|
|
|
h_args.crc = &crc;
|
|
|
|
nbytes += vidtv_psi_table_header_write_into(&h_args);
|
|
|
|
/* note that the field 'u16 programs' is not really part of the PAT */
|
|
|
|
psi_args.crc = &crc;
|
|
|
|
while (p) {
|
|
/* copy the PAT programs */
|
|
psi_args.from = p;
|
|
/* skip the pointer */
|
|
psi_args.len = sizeof(*p) -
|
|
sizeof(struct vidtv_psi_table_pat_program *);
|
|
psi_args.dest_offset = args->offset + nbytes;
|
|
psi_args.continuity_counter = args->continuity_counter;
|
|
|
|
nbytes += vidtv_psi_ts_psi_write_into(&psi_args);
|
|
|
|
p = p->next;
|
|
}
|
|
|
|
c_args.dest_offset = args->offset + nbytes;
|
|
c_args.continuity_counter = args->continuity_counter;
|
|
c_args.crc = cpu_to_be32(crc);
|
|
|
|
/* Write the CRC32 at the end */
|
|
nbytes += table_section_crc32_write_into(&c_args);
|
|
|
|
return nbytes;
|
|
}
|
|
|
|
void
|
|
vidtv_psi_pat_table_destroy(struct vidtv_psi_table_pat *p)
|
|
{
|
|
vidtv_psi_pat_program_destroy(p->program);
|
|
kfree(p);
|
|
}
|
|
|
|
struct vidtv_psi_table_pmt_stream*
|
|
vidtv_psi_pmt_stream_init(struct vidtv_psi_table_pmt_stream *head,
|
|
enum vidtv_psi_stream_types stream_type,
|
|
u16 es_pid)
|
|
{
|
|
struct vidtv_psi_table_pmt_stream *stream;
|
|
const u16 RESERVED1 = 0x07;
|
|
const u16 RESERVED2 = 0x0f;
|
|
const u16 ZERO = 0x0;
|
|
u16 desc_loop_len;
|
|
|
|
stream = kzalloc_obj(*stream);
|
|
if (!stream)
|
|
return NULL;
|
|
|
|
stream->type = stream_type;
|
|
|
|
stream->bitfield = cpu_to_be16((RESERVED1 << 13) | es_pid);
|
|
|
|
desc_loop_len = vidtv_psi_desc_comp_loop_len(stream->descriptor);
|
|
|
|
stream->bitfield2 = cpu_to_be16((RESERVED2 << 12) |
|
|
(ZERO << 10) |
|
|
desc_loop_len);
|
|
stream->next = NULL;
|
|
|
|
if (head) {
|
|
while (head->next)
|
|
head = head->next;
|
|
|
|
head->next = stream;
|
|
}
|
|
|
|
return stream;
|
|
}
|
|
|
|
void vidtv_psi_pmt_stream_destroy(struct vidtv_psi_table_pmt_stream *s)
|
|
{
|
|
struct vidtv_psi_table_pmt_stream *tmp_stream = NULL;
|
|
struct vidtv_psi_table_pmt_stream *curr_stream = s;
|
|
|
|
while (curr_stream) {
|
|
tmp_stream = curr_stream;
|
|
curr_stream = curr_stream->next;
|
|
vidtv_psi_desc_destroy(tmp_stream->descriptor);
|
|
kfree(tmp_stream);
|
|
}
|
|
}
|
|
|
|
void vidtv_psi_pmt_stream_assign(struct vidtv_psi_table_pmt *pmt,
|
|
struct vidtv_psi_table_pmt_stream *s)
|
|
{
|
|
do {
|
|
/* This function transfers ownership of s to the table */
|
|
if (s == pmt->stream)
|
|
return;
|
|
|
|
pmt->stream = s;
|
|
vidtv_psi_pmt_table_update_sec_len(pmt);
|
|
|
|
s = NULL;
|
|
} while (vidtv_psi_get_sec_len(&pmt->header) > MAX_SECTION_LEN);
|
|
|
|
vidtv_psi_update_version_num(&pmt->header);
|
|
}
|
|
|
|
u16 vidtv_psi_pmt_get_pid(struct vidtv_psi_table_pmt *section,
|
|
struct vidtv_psi_table_pat *pat)
|
|
{
|
|
struct vidtv_psi_table_pat_program *program = pat->program;
|
|
|
|
/*
|
|
* service_id is the same as program_number in the
|
|
* corresponding program_map_section
|
|
* see ETSI EN 300 468 v1.15.1 p. 24
|
|
*/
|
|
while (program) {
|
|
if (program->service_id == section->header.id)
|
|
return vidtv_psi_get_pat_program_pid(program);
|
|
|
|
program = program->next;
|
|
}
|
|
|
|
return TS_LAST_VALID_PID + 1; /* not found */
|
|
}
|
|
|
|
struct vidtv_psi_table_pmt *vidtv_psi_pmt_table_init(u16 program_number,
|
|
u16 pcr_pid)
|
|
{
|
|
struct vidtv_psi_table_pmt *pmt;
|
|
const u16 RESERVED1 = 0x07;
|
|
const u16 RESERVED2 = 0x0f;
|
|
const u16 SYNTAX = 0x1;
|
|
const u16 ONES = 0x03;
|
|
const u16 ZERO = 0x0;
|
|
u16 desc_loop_len;
|
|
|
|
pmt = kzalloc_obj(*pmt);
|
|
if (!pmt)
|
|
return NULL;
|
|
|
|
if (!pcr_pid)
|
|
pcr_pid = 0x1fff;
|
|
|
|
pmt->header.table_id = 0x2;
|
|
|
|
pmt->header.bitfield = cpu_to_be16((SYNTAX << 15) | (ZERO << 14) | (ONES << 12));
|
|
|
|
pmt->header.id = cpu_to_be16(program_number);
|
|
pmt->header.current_next = 0x1;
|
|
|
|
pmt->header.version = 0x1f;
|
|
|
|
pmt->header.one2 = ONES;
|
|
pmt->header.section_id = 0;
|
|
pmt->header.last_section = 0;
|
|
|
|
pmt->bitfield = cpu_to_be16((RESERVED1 << 13) | pcr_pid);
|
|
|
|
desc_loop_len = vidtv_psi_desc_comp_loop_len(pmt->descriptor);
|
|
|
|
pmt->bitfield2 = cpu_to_be16((RESERVED2 << 12) |
|
|
(ZERO << 10) |
|
|
desc_loop_len);
|
|
|
|
vidtv_psi_pmt_table_update_sec_len(pmt);
|
|
|
|
return pmt;
|
|
}
|
|
|
|
u32 vidtv_psi_pmt_write_into(struct vidtv_psi_pmt_write_args *args)
|
|
{
|
|
struct vidtv_psi_desc *table_descriptor = args->pmt->descriptor;
|
|
struct vidtv_psi_table_pmt_stream *stream = args->pmt->stream;
|
|
struct vidtv_psi_desc *stream_descriptor;
|
|
u32 crc = INITIAL_CRC;
|
|
u32 nbytes = 0;
|
|
struct header_write_args h_args = {
|
|
.dest_buf = args->buf,
|
|
.dest_offset = args->offset,
|
|
.h = &args->pmt->header,
|
|
.pid = args->pid,
|
|
.continuity_counter = args->continuity_counter,
|
|
.dest_buf_sz = args->buf_sz,
|
|
};
|
|
struct psi_write_args psi_args = {
|
|
.dest_buf = args->buf,
|
|
.from = &args->pmt->bitfield,
|
|
.len = sizeof_field(struct vidtv_psi_table_pmt, bitfield) +
|
|
sizeof_field(struct vidtv_psi_table_pmt, bitfield2),
|
|
.pid = args->pid,
|
|
.new_psi_section = false,
|
|
.is_crc = false,
|
|
.dest_buf_sz = args->buf_sz,
|
|
.crc = &crc,
|
|
};
|
|
struct desc_write_args d_args = {
|
|
.dest_buf = args->buf,
|
|
.desc = table_descriptor,
|
|
.pid = args->pid,
|
|
.dest_buf_sz = args->buf_sz,
|
|
};
|
|
struct crc32_write_args c_args = {
|
|
.dest_buf = args->buf,
|
|
.pid = args->pid,
|
|
.dest_buf_sz = args->buf_sz,
|
|
};
|
|
|
|
vidtv_psi_pmt_table_update_sec_len(args->pmt);
|
|
|
|
h_args.crc = &crc;
|
|
|
|
nbytes += vidtv_psi_table_header_write_into(&h_args);
|
|
|
|
/* write the two bitfields */
|
|
psi_args.dest_offset = args->offset + nbytes;
|
|
psi_args.continuity_counter = args->continuity_counter;
|
|
nbytes += vidtv_psi_ts_psi_write_into(&psi_args);
|
|
|
|
while (table_descriptor) {
|
|
/* write the descriptors, if any */
|
|
d_args.dest_offset = args->offset + nbytes;
|
|
d_args.continuity_counter = args->continuity_counter;
|
|
d_args.crc = &crc;
|
|
|
|
nbytes += vidtv_psi_desc_write_into(&d_args);
|
|
|
|
table_descriptor = table_descriptor->next;
|
|
}
|
|
|
|
psi_args.len += sizeof_field(struct vidtv_psi_table_pmt_stream, type);
|
|
while (stream) {
|
|
/* write the streams, if any */
|
|
psi_args.from = stream;
|
|
psi_args.dest_offset = args->offset + nbytes;
|
|
psi_args.continuity_counter = args->continuity_counter;
|
|
|
|
nbytes += vidtv_psi_ts_psi_write_into(&psi_args);
|
|
|
|
stream_descriptor = stream->descriptor;
|
|
|
|
while (stream_descriptor) {
|
|
/* write the stream descriptors, if any */
|
|
d_args.dest_offset = args->offset + nbytes;
|
|
d_args.desc = stream_descriptor;
|
|
d_args.continuity_counter = args->continuity_counter;
|
|
d_args.crc = &crc;
|
|
|
|
nbytes += vidtv_psi_desc_write_into(&d_args);
|
|
|
|
stream_descriptor = stream_descriptor->next;
|
|
}
|
|
|
|
stream = stream->next;
|
|
}
|
|
|
|
c_args.dest_offset = args->offset + nbytes;
|
|
c_args.crc = cpu_to_be32(crc);
|
|
c_args.continuity_counter = args->continuity_counter;
|
|
|
|
/* Write the CRC32 at the end */
|
|
nbytes += table_section_crc32_write_into(&c_args);
|
|
|
|
return nbytes;
|
|
}
|
|
|
|
void vidtv_psi_pmt_table_destroy(struct vidtv_psi_table_pmt *pmt)
|
|
{
|
|
vidtv_psi_desc_destroy(pmt->descriptor);
|
|
vidtv_psi_pmt_stream_destroy(pmt->stream);
|
|
kfree(pmt);
|
|
}
|
|
|
|
struct vidtv_psi_table_sdt *vidtv_psi_sdt_table_init(u16 network_id,
|
|
u16 transport_stream_id)
|
|
{
|
|
struct vidtv_psi_table_sdt *sdt;
|
|
const u16 RESERVED = 0xff;
|
|
const u16 SYNTAX = 0x1;
|
|
const u16 ONES = 0x03;
|
|
const u16 ONE = 0x1;
|
|
|
|
sdt = kzalloc_obj(*sdt);
|
|
if (!sdt)
|
|
return NULL;
|
|
|
|
sdt->header.table_id = 0x42;
|
|
sdt->header.bitfield = cpu_to_be16((SYNTAX << 15) | (ONE << 14) | (ONES << 12));
|
|
|
|
/*
|
|
* This is a 16-bit field which serves as a label for identification
|
|
* of the TS, about which the SDT informs, from any other multiplex
|
|
* within the delivery system.
|
|
*/
|
|
sdt->header.id = cpu_to_be16(transport_stream_id);
|
|
sdt->header.current_next = ONE;
|
|
|
|
sdt->header.version = 0x1f;
|
|
|
|
sdt->header.one2 = ONES;
|
|
sdt->header.section_id = 0;
|
|
sdt->header.last_section = 0;
|
|
|
|
/*
|
|
* FIXME: The network_id range from 0xFF01 to 0xFFFF is used to
|
|
* indicate temporary private use. For now, let's use the first
|
|
* value.
|
|
* This can be changed to something more useful, when support for
|
|
* NIT gets added
|
|
*/
|
|
sdt->network_id = cpu_to_be16(network_id);
|
|
sdt->reserved = RESERVED;
|
|
|
|
vidtv_psi_sdt_table_update_sec_len(sdt);
|
|
|
|
return sdt;
|
|
}
|
|
|
|
u32 vidtv_psi_sdt_write_into(struct vidtv_psi_sdt_write_args *args)
|
|
{
|
|
struct header_write_args h_args = {
|
|
.dest_buf = args->buf,
|
|
.dest_offset = args->offset,
|
|
.h = &args->sdt->header,
|
|
.pid = VIDTV_SDT_PID,
|
|
.dest_buf_sz = args->buf_sz,
|
|
};
|
|
struct psi_write_args psi_args = {
|
|
.dest_buf = args->buf,
|
|
.len = sizeof_field(struct vidtv_psi_table_sdt, network_id) +
|
|
sizeof_field(struct vidtv_psi_table_sdt, reserved),
|
|
.pid = VIDTV_SDT_PID,
|
|
.new_psi_section = false,
|
|
.is_crc = false,
|
|
.dest_buf_sz = args->buf_sz,
|
|
};
|
|
struct desc_write_args d_args = {
|
|
.dest_buf = args->buf,
|
|
.pid = VIDTV_SDT_PID,
|
|
.dest_buf_sz = args->buf_sz,
|
|
};
|
|
struct crc32_write_args c_args = {
|
|
.dest_buf = args->buf,
|
|
.pid = VIDTV_SDT_PID,
|
|
.dest_buf_sz = args->buf_sz,
|
|
};
|
|
struct vidtv_psi_table_sdt_service *service = args->sdt->service;
|
|
struct vidtv_psi_desc *service_desc;
|
|
u32 nbytes = 0;
|
|
u32 crc = INITIAL_CRC;
|
|
|
|
/* see ETSI EN 300 468 v1.15.1 p. 11 */
|
|
|
|
vidtv_psi_sdt_table_update_sec_len(args->sdt);
|
|
|
|
h_args.continuity_counter = args->continuity_counter;
|
|
h_args.crc = &crc;
|
|
|
|
nbytes += vidtv_psi_table_header_write_into(&h_args);
|
|
|
|
psi_args.from = &args->sdt->network_id;
|
|
psi_args.dest_offset = args->offset + nbytes;
|
|
psi_args.continuity_counter = args->continuity_counter;
|
|
psi_args.crc = &crc;
|
|
|
|
/* copy u16 network_id + u8 reserved)*/
|
|
nbytes += vidtv_psi_ts_psi_write_into(&psi_args);
|
|
|
|
/* skip both pointers at the end */
|
|
psi_args.len = sizeof(struct vidtv_psi_table_sdt_service) -
|
|
sizeof(struct vidtv_psi_desc *) -
|
|
sizeof(struct vidtv_psi_table_sdt_service *);
|
|
|
|
while (service) {
|
|
/* copy the services, if any */
|
|
psi_args.from = service;
|
|
psi_args.dest_offset = args->offset + nbytes;
|
|
psi_args.continuity_counter = args->continuity_counter;
|
|
|
|
nbytes += vidtv_psi_ts_psi_write_into(&psi_args);
|
|
|
|
service_desc = service->descriptor;
|
|
|
|
while (service_desc) {
|
|
/* copy the service descriptors, if any */
|
|
d_args.dest_offset = args->offset + nbytes;
|
|
d_args.desc = service_desc;
|
|
d_args.continuity_counter = args->continuity_counter;
|
|
d_args.crc = &crc;
|
|
|
|
nbytes += vidtv_psi_desc_write_into(&d_args);
|
|
|
|
service_desc = service_desc->next;
|
|
}
|
|
|
|
service = service->next;
|
|
}
|
|
|
|
c_args.dest_offset = args->offset + nbytes;
|
|
c_args.crc = cpu_to_be32(crc);
|
|
c_args.continuity_counter = args->continuity_counter;
|
|
|
|
/* Write the CRC at the end */
|
|
nbytes += table_section_crc32_write_into(&c_args);
|
|
|
|
return nbytes;
|
|
}
|
|
|
|
void vidtv_psi_sdt_table_destroy(struct vidtv_psi_table_sdt *sdt)
|
|
{
|
|
vidtv_psi_sdt_service_destroy(sdt->service);
|
|
kfree(sdt);
|
|
}
|
|
|
|
struct vidtv_psi_table_sdt_service
|
|
*vidtv_psi_sdt_service_init(struct vidtv_psi_table_sdt_service *head,
|
|
u16 service_id,
|
|
bool eit_schedule,
|
|
bool eit_present_following)
|
|
{
|
|
struct vidtv_psi_table_sdt_service *service;
|
|
|
|
service = kzalloc_obj(*service);
|
|
if (!service)
|
|
return NULL;
|
|
|
|
/*
|
|
* ETSI 300 468: this is a 16bit field which serves as a label to
|
|
* identify this service from any other service within the TS.
|
|
* The service id is the same as the program number in the
|
|
* corresponding program_map_section
|
|
*/
|
|
service->service_id = cpu_to_be16(service_id);
|
|
service->EIT_schedule = eit_schedule;
|
|
service->EIT_present_following = eit_present_following;
|
|
service->reserved = 0x3f;
|
|
|
|
service->bitfield = cpu_to_be16(RUNNING << 13);
|
|
|
|
if (head) {
|
|
while (head->next)
|
|
head = head->next;
|
|
|
|
head->next = service;
|
|
}
|
|
|
|
return service;
|
|
}
|
|
|
|
void
|
|
vidtv_psi_sdt_service_destroy(struct vidtv_psi_table_sdt_service *service)
|
|
{
|
|
struct vidtv_psi_table_sdt_service *curr = service;
|
|
struct vidtv_psi_table_sdt_service *tmp = NULL;
|
|
|
|
while (curr) {
|
|
tmp = curr;
|
|
curr = curr->next;
|
|
vidtv_psi_desc_destroy(tmp->descriptor);
|
|
kfree(tmp);
|
|
}
|
|
}
|
|
|
|
void
|
|
vidtv_psi_sdt_service_assign(struct vidtv_psi_table_sdt *sdt,
|
|
struct vidtv_psi_table_sdt_service *service)
|
|
{
|
|
do {
|
|
if (service == sdt->service)
|
|
return;
|
|
|
|
sdt->service = service;
|
|
|
|
/* recompute section length */
|
|
vidtv_psi_sdt_table_update_sec_len(sdt);
|
|
|
|
service = NULL;
|
|
} while (vidtv_psi_get_sec_len(&sdt->header) > MAX_SECTION_LEN);
|
|
|
|
vidtv_psi_update_version_num(&sdt->header);
|
|
}
|
|
|
|
/*
|
|
* PMTs contain information about programs. For each program,
|
|
* there is one PMT section. This function will create a section
|
|
* for each program found in the PAT
|
|
*/
|
|
struct vidtv_psi_table_pmt**
|
|
vidtv_psi_pmt_create_sec_for_each_pat_entry(struct vidtv_psi_table_pat *pat,
|
|
u16 pcr_pid)
|
|
|
|
{
|
|
struct vidtv_psi_table_pat_program *program;
|
|
struct vidtv_psi_table_pmt **pmt_secs;
|
|
u32 i = 0, num_pmt = 0;
|
|
|
|
/*
|
|
* The number of PMT entries is the number of PAT entries
|
|
* that contain service_id. That exclude special tables, like NIT
|
|
*/
|
|
program = pat->program;
|
|
while (program) {
|
|
if (program->service_id)
|
|
num_pmt++;
|
|
program = program->next;
|
|
}
|
|
|
|
pmt_secs = kzalloc_objs(struct vidtv_psi_table_pmt *, num_pmt);
|
|
if (!pmt_secs)
|
|
return NULL;
|
|
|
|
for (program = pat->program; program; program = program->next) {
|
|
if (!program->service_id)
|
|
continue;
|
|
pmt_secs[i] = vidtv_psi_pmt_table_init(be16_to_cpu(program->service_id),
|
|
pcr_pid);
|
|
|
|
if (!pmt_secs[i]) {
|
|
while (i > 0) {
|
|
i--;
|
|
vidtv_psi_pmt_table_destroy(pmt_secs[i]);
|
|
}
|
|
return NULL;
|
|
}
|
|
i++;
|
|
}
|
|
pat->num_pmt = num_pmt;
|
|
|
|
return pmt_secs;
|
|
}
|
|
|
|
/* find the PMT section associated with 'program_num' */
|
|
struct vidtv_psi_table_pmt
|
|
*vidtv_psi_find_pmt_sec(struct vidtv_psi_table_pmt **pmt_sections,
|
|
u16 nsections,
|
|
u16 program_num)
|
|
{
|
|
struct vidtv_psi_table_pmt *sec = NULL;
|
|
u32 i;
|
|
|
|
for (i = 0; i < nsections; ++i) {
|
|
sec = pmt_sections[i];
|
|
if (be16_to_cpu(sec->header.id) == program_num)
|
|
return sec;
|
|
}
|
|
|
|
return NULL; /* not found */
|
|
}
|
|
|
|
static void vidtv_psi_nit_table_update_sec_len(struct vidtv_psi_table_nit *nit)
|
|
{
|
|
u16 length = 0;
|
|
struct vidtv_psi_table_transport *t = nit->transport;
|
|
u16 desc_loop_len;
|
|
u16 transport_loop_len = 0;
|
|
|
|
/*
|
|
* from immediately after 'section_length' until
|
|
* 'network_descriptor_length'
|
|
*/
|
|
length += NIT_LEN_UNTIL_NETWORK_DESCRIPTOR_LEN;
|
|
|
|
desc_loop_len = vidtv_psi_desc_comp_loop_len(nit->descriptor);
|
|
vidtv_psi_set_desc_loop_len(&nit->bitfield, desc_loop_len, 12);
|
|
|
|
length += desc_loop_len;
|
|
|
|
length += sizeof_field(struct vidtv_psi_table_nit, bitfield2);
|
|
|
|
while (t) {
|
|
/* skip both pointers at the end */
|
|
transport_loop_len += sizeof(struct vidtv_psi_table_transport) -
|
|
sizeof(struct vidtv_psi_desc *) -
|
|
sizeof(struct vidtv_psi_table_transport *);
|
|
|
|
length += transport_loop_len;
|
|
|
|
desc_loop_len = vidtv_psi_desc_comp_loop_len(t->descriptor);
|
|
vidtv_psi_set_desc_loop_len(&t->bitfield, desc_loop_len, 12);
|
|
|
|
length += desc_loop_len;
|
|
|
|
t = t->next;
|
|
}
|
|
|
|
// Actually sets the transport stream loop len, maybe rename this function later
|
|
vidtv_psi_set_desc_loop_len(&nit->bitfield2, transport_loop_len, 12);
|
|
length += CRC_SIZE_IN_BYTES;
|
|
|
|
vidtv_psi_set_sec_len(&nit->header, length);
|
|
}
|
|
|
|
struct vidtv_psi_table_nit
|
|
*vidtv_psi_nit_table_init(u16 network_id,
|
|
u16 transport_stream_id,
|
|
char *network_name,
|
|
struct vidtv_psi_desc_service_list_entry *service_list)
|
|
{
|
|
struct vidtv_psi_table_transport *transport;
|
|
struct vidtv_psi_table_nit *nit;
|
|
const u16 SYNTAX = 0x1;
|
|
const u16 ONES = 0x03;
|
|
const u16 ONE = 0x1;
|
|
|
|
nit = kzalloc_obj(*nit);
|
|
if (!nit)
|
|
return NULL;
|
|
|
|
transport = kzalloc_obj(*transport);
|
|
if (!transport)
|
|
goto free_nit;
|
|
|
|
nit->header.table_id = 0x40; // ACTUAL_NETWORK
|
|
|
|
nit->header.bitfield = cpu_to_be16((SYNTAX << 15) | (ONE << 14) | (ONES << 12));
|
|
|
|
nit->header.id = cpu_to_be16(network_id);
|
|
nit->header.current_next = ONE;
|
|
|
|
nit->header.version = 0x1f;
|
|
|
|
nit->header.one2 = ONES;
|
|
nit->header.section_id = 0;
|
|
nit->header.last_section = 0;
|
|
|
|
nit->bitfield = cpu_to_be16(0xf);
|
|
nit->bitfield2 = cpu_to_be16(0xf);
|
|
|
|
nit->descriptor = (struct vidtv_psi_desc *)
|
|
vidtv_psi_network_name_desc_init(NULL, network_name);
|
|
if (!nit->descriptor)
|
|
goto free_transport;
|
|
|
|
transport->transport_id = cpu_to_be16(transport_stream_id);
|
|
transport->network_id = cpu_to_be16(network_id);
|
|
transport->bitfield = cpu_to_be16(0xf);
|
|
transport->descriptor = (struct vidtv_psi_desc *)
|
|
vidtv_psi_service_list_desc_init(NULL, service_list);
|
|
if (!transport->descriptor)
|
|
goto free_nit_desc;
|
|
|
|
nit->transport = transport;
|
|
|
|
vidtv_psi_nit_table_update_sec_len(nit);
|
|
|
|
return nit;
|
|
|
|
free_nit_desc:
|
|
vidtv_psi_desc_destroy((struct vidtv_psi_desc *)nit->descriptor);
|
|
|
|
free_transport:
|
|
kfree(transport);
|
|
free_nit:
|
|
kfree(nit);
|
|
return NULL;
|
|
}
|
|
|
|
u32 vidtv_psi_nit_write_into(struct vidtv_psi_nit_write_args *args)
|
|
{
|
|
struct header_write_args h_args = {
|
|
.dest_buf = args->buf,
|
|
.dest_offset = args->offset,
|
|
.h = &args->nit->header,
|
|
.pid = VIDTV_NIT_PID,
|
|
.dest_buf_sz = args->buf_sz,
|
|
};
|
|
struct psi_write_args psi_args = {
|
|
.dest_buf = args->buf,
|
|
.from = &args->nit->bitfield,
|
|
.len = sizeof_field(struct vidtv_psi_table_nit, bitfield),
|
|
.pid = VIDTV_NIT_PID,
|
|
.new_psi_section = false,
|
|
.is_crc = false,
|
|
.dest_buf_sz = args->buf_sz,
|
|
};
|
|
struct desc_write_args d_args = {
|
|
.dest_buf = args->buf,
|
|
.pid = VIDTV_NIT_PID,
|
|
.dest_buf_sz = args->buf_sz,
|
|
};
|
|
struct crc32_write_args c_args = {
|
|
.dest_buf = args->buf,
|
|
.pid = VIDTV_NIT_PID,
|
|
.dest_buf_sz = args->buf_sz,
|
|
};
|
|
struct vidtv_psi_desc *table_descriptor = args->nit->descriptor;
|
|
struct vidtv_psi_table_transport *transport = args->nit->transport;
|
|
struct vidtv_psi_desc *transport_descriptor;
|
|
u32 crc = INITIAL_CRC;
|
|
u32 nbytes = 0;
|
|
|
|
vidtv_psi_nit_table_update_sec_len(args->nit);
|
|
|
|
h_args.continuity_counter = args->continuity_counter;
|
|
h_args.crc = &crc;
|
|
|
|
nbytes += vidtv_psi_table_header_write_into(&h_args);
|
|
|
|
/* write the bitfield */
|
|
|
|
psi_args.dest_offset = args->offset + nbytes;
|
|
psi_args.continuity_counter = args->continuity_counter;
|
|
psi_args.crc = &crc;
|
|
|
|
nbytes += vidtv_psi_ts_psi_write_into(&psi_args);
|
|
|
|
while (table_descriptor) {
|
|
/* write the descriptors, if any */
|
|
d_args.dest_offset = args->offset + nbytes;
|
|
d_args.desc = table_descriptor;
|
|
d_args.continuity_counter = args->continuity_counter;
|
|
d_args.crc = &crc;
|
|
|
|
nbytes += vidtv_psi_desc_write_into(&d_args);
|
|
|
|
table_descriptor = table_descriptor->next;
|
|
}
|
|
|
|
/* write the second bitfield */
|
|
psi_args.from = &args->nit->bitfield2;
|
|
psi_args.len = sizeof_field(struct vidtv_psi_table_nit, bitfield2);
|
|
psi_args.dest_offset = args->offset + nbytes;
|
|
|
|
nbytes += vidtv_psi_ts_psi_write_into(&psi_args);
|
|
|
|
psi_args.len = sizeof_field(struct vidtv_psi_table_transport, transport_id) +
|
|
sizeof_field(struct vidtv_psi_table_transport, network_id) +
|
|
sizeof_field(struct vidtv_psi_table_transport, bitfield);
|
|
while (transport) {
|
|
/* write the transport sections, if any */
|
|
psi_args.from = transport;
|
|
psi_args.dest_offset = args->offset + nbytes;
|
|
|
|
nbytes += vidtv_psi_ts_psi_write_into(&psi_args);
|
|
|
|
transport_descriptor = transport->descriptor;
|
|
|
|
while (transport_descriptor) {
|
|
/* write the transport descriptors, if any */
|
|
d_args.dest_offset = args->offset + nbytes;
|
|
d_args.desc = transport_descriptor;
|
|
d_args.continuity_counter = args->continuity_counter;
|
|
d_args.crc = &crc;
|
|
|
|
nbytes += vidtv_psi_desc_write_into(&d_args);
|
|
|
|
transport_descriptor = transport_descriptor->next;
|
|
}
|
|
|
|
transport = transport->next;
|
|
}
|
|
|
|
c_args.dest_offset = args->offset + nbytes;
|
|
c_args.crc = cpu_to_be32(crc);
|
|
c_args.continuity_counter = args->continuity_counter;
|
|
|
|
/* Write the CRC32 at the end */
|
|
nbytes += table_section_crc32_write_into(&c_args);
|
|
|
|
return nbytes;
|
|
}
|
|
|
|
static void vidtv_psi_transport_destroy(struct vidtv_psi_table_transport *t)
|
|
{
|
|
struct vidtv_psi_table_transport *tmp_t = NULL;
|
|
struct vidtv_psi_table_transport *curr_t = t;
|
|
|
|
while (curr_t) {
|
|
tmp_t = curr_t;
|
|
curr_t = curr_t->next;
|
|
vidtv_psi_desc_destroy(tmp_t->descriptor);
|
|
kfree(tmp_t);
|
|
}
|
|
}
|
|
|
|
void vidtv_psi_nit_table_destroy(struct vidtv_psi_table_nit *nit)
|
|
{
|
|
vidtv_psi_desc_destroy(nit->descriptor);
|
|
vidtv_psi_transport_destroy(nit->transport);
|
|
kfree(nit);
|
|
}
|
|
|
|
void vidtv_psi_eit_table_update_sec_len(struct vidtv_psi_table_eit *eit)
|
|
{
|
|
struct vidtv_psi_table_eit_event *e = eit->event;
|
|
u16 desc_loop_len;
|
|
u16 length = 0;
|
|
|
|
/*
|
|
* from immediately after 'section_length' until
|
|
* 'last_table_id'
|
|
*/
|
|
length += EIT_LEN_UNTIL_LAST_TABLE_ID;
|
|
|
|
while (e) {
|
|
/* skip both pointers at the end */
|
|
length += sizeof(struct vidtv_psi_table_eit_event) -
|
|
sizeof(struct vidtv_psi_desc *) -
|
|
sizeof(struct vidtv_psi_table_eit_event *);
|
|
|
|
desc_loop_len = vidtv_psi_desc_comp_loop_len(e->descriptor);
|
|
vidtv_psi_set_desc_loop_len(&e->bitfield, desc_loop_len, 12);
|
|
|
|
length += desc_loop_len;
|
|
|
|
e = e->next;
|
|
}
|
|
|
|
length += CRC_SIZE_IN_BYTES;
|
|
|
|
vidtv_psi_set_sec_len(&eit->header, length);
|
|
}
|
|
|
|
void vidtv_psi_eit_event_assign(struct vidtv_psi_table_eit *eit,
|
|
struct vidtv_psi_table_eit_event *e)
|
|
{
|
|
do {
|
|
if (e == eit->event)
|
|
return;
|
|
|
|
eit->event = e;
|
|
vidtv_psi_eit_table_update_sec_len(eit);
|
|
|
|
e = NULL;
|
|
} while (vidtv_psi_get_sec_len(&eit->header) > EIT_MAX_SECTION_LEN);
|
|
|
|
vidtv_psi_update_version_num(&eit->header);
|
|
}
|
|
|
|
struct vidtv_psi_table_eit
|
|
*vidtv_psi_eit_table_init(u16 network_id,
|
|
u16 transport_stream_id,
|
|
__be16 service_id)
|
|
{
|
|
struct vidtv_psi_table_eit *eit;
|
|
const u16 SYNTAX = 0x1;
|
|
const u16 ONE = 0x1;
|
|
const u16 ONES = 0x03;
|
|
|
|
eit = kzalloc_obj(*eit);
|
|
if (!eit)
|
|
return NULL;
|
|
|
|
eit->header.table_id = 0x4e; //actual_transport_stream: present/following
|
|
|
|
eit->header.bitfield = cpu_to_be16((SYNTAX << 15) | (ONE << 14) | (ONES << 12));
|
|
|
|
eit->header.id = service_id;
|
|
eit->header.current_next = ONE;
|
|
|
|
eit->header.version = 0x1f;
|
|
|
|
eit->header.one2 = ONES;
|
|
eit->header.section_id = 0;
|
|
eit->header.last_section = 0;
|
|
|
|
eit->transport_id = cpu_to_be16(transport_stream_id);
|
|
eit->network_id = cpu_to_be16(network_id);
|
|
|
|
eit->last_segment = eit->header.last_section; /* not implemented */
|
|
eit->last_table_id = eit->header.table_id; /* not implemented */
|
|
|
|
vidtv_psi_eit_table_update_sec_len(eit);
|
|
|
|
return eit;
|
|
}
|
|
|
|
u32 vidtv_psi_eit_write_into(struct vidtv_psi_eit_write_args *args)
|
|
{
|
|
struct header_write_args h_args = {
|
|
.dest_buf = args->buf,
|
|
.dest_offset = args->offset,
|
|
.h = &args->eit->header,
|
|
.pid = VIDTV_EIT_PID,
|
|
.dest_buf_sz = args->buf_sz,
|
|
};
|
|
struct psi_write_args psi_args = {
|
|
.dest_buf = args->buf,
|
|
.len = sizeof_field(struct vidtv_psi_table_eit, transport_id) +
|
|
sizeof_field(struct vidtv_psi_table_eit, network_id) +
|
|
sizeof_field(struct vidtv_psi_table_eit, last_segment) +
|
|
sizeof_field(struct vidtv_psi_table_eit, last_table_id),
|
|
.pid = VIDTV_EIT_PID,
|
|
.new_psi_section = false,
|
|
.is_crc = false,
|
|
.dest_buf_sz = args->buf_sz,
|
|
};
|
|
struct desc_write_args d_args = {
|
|
.dest_buf = args->buf,
|
|
.pid = VIDTV_EIT_PID,
|
|
.dest_buf_sz = args->buf_sz,
|
|
};
|
|
struct crc32_write_args c_args = {
|
|
.dest_buf = args->buf,
|
|
.pid = VIDTV_EIT_PID,
|
|
.dest_buf_sz = args->buf_sz,
|
|
};
|
|
struct vidtv_psi_table_eit_event *event = args->eit->event;
|
|
struct vidtv_psi_desc *event_descriptor;
|
|
u32 crc = INITIAL_CRC;
|
|
u32 nbytes = 0;
|
|
|
|
vidtv_psi_eit_table_update_sec_len(args->eit);
|
|
|
|
h_args.continuity_counter = args->continuity_counter;
|
|
h_args.crc = &crc;
|
|
|
|
nbytes += vidtv_psi_table_header_write_into(&h_args);
|
|
|
|
psi_args.from = &args->eit->transport_id;
|
|
psi_args.dest_offset = args->offset + nbytes;
|
|
psi_args.continuity_counter = args->continuity_counter;
|
|
psi_args.crc = &crc;
|
|
|
|
nbytes += vidtv_psi_ts_psi_write_into(&psi_args);
|
|
|
|
/* skip both pointers at the end */
|
|
psi_args.len = sizeof(struct vidtv_psi_table_eit_event) -
|
|
sizeof(struct vidtv_psi_desc *) -
|
|
sizeof(struct vidtv_psi_table_eit_event *);
|
|
while (event) {
|
|
/* copy the events, if any */
|
|
psi_args.from = event;
|
|
psi_args.dest_offset = args->offset + nbytes;
|
|
|
|
nbytes += vidtv_psi_ts_psi_write_into(&psi_args);
|
|
|
|
event_descriptor = event->descriptor;
|
|
|
|
while (event_descriptor) {
|
|
/* copy the event descriptors, if any */
|
|
d_args.dest_offset = args->offset + nbytes;
|
|
d_args.desc = event_descriptor;
|
|
d_args.continuity_counter = args->continuity_counter;
|
|
d_args.crc = &crc;
|
|
|
|
nbytes += vidtv_psi_desc_write_into(&d_args);
|
|
|
|
event_descriptor = event_descriptor->next;
|
|
}
|
|
|
|
event = event->next;
|
|
}
|
|
|
|
c_args.dest_offset = args->offset + nbytes;
|
|
c_args.crc = cpu_to_be32(crc);
|
|
c_args.continuity_counter = args->continuity_counter;
|
|
|
|
/* Write the CRC at the end */
|
|
nbytes += table_section_crc32_write_into(&c_args);
|
|
|
|
return nbytes;
|
|
}
|
|
|
|
struct vidtv_psi_table_eit_event
|
|
*vidtv_psi_eit_event_init(struct vidtv_psi_table_eit_event *head, u16 event_id)
|
|
{
|
|
static const u8 DURATION[] = {0x23, 0x59, 0x59}; /* BCD encoded */
|
|
struct vidtv_psi_table_eit_event *e;
|
|
struct timespec64 ts;
|
|
struct tm time;
|
|
int mjd, l;
|
|
__be16 mjd_be;
|
|
|
|
e = kzalloc_obj(*e);
|
|
if (!e)
|
|
return NULL;
|
|
|
|
e->event_id = cpu_to_be16(event_id);
|
|
|
|
ts = ktime_to_timespec64(ktime_get_real());
|
|
time64_to_tm(ts.tv_sec, 0, &time);
|
|
|
|
/* Convert date to Modified Julian Date - per EN 300 468 Annex C */
|
|
if (time.tm_mon < 2)
|
|
l = 1;
|
|
else
|
|
l = 0;
|
|
|
|
mjd = 14956 + time.tm_mday;
|
|
mjd += (time.tm_year - l) * 36525 / 100;
|
|
mjd += (time.tm_mon + 2 + l * 12) * 306001 / 10000;
|
|
mjd_be = cpu_to_be16(mjd);
|
|
|
|
/*
|
|
* Store MJD and hour/min/sec to the event.
|
|
*
|
|
* Let's make the event to start on a full hour
|
|
*/
|
|
memcpy(e->start_time, &mjd_be, sizeof(mjd_be));
|
|
e->start_time[2] = bin2bcd(time.tm_hour);
|
|
e->start_time[3] = 0;
|
|
e->start_time[4] = 0;
|
|
|
|
/*
|
|
* TODO: for now, the event will last for a day. Should be
|
|
* enough for testing purposes, but if one runs the driver
|
|
* for more than that, the current event will become invalid.
|
|
* So, we need a better code here in order to change the start
|
|
* time once the event expires.
|
|
*/
|
|
memcpy(e->duration, DURATION, sizeof(e->duration));
|
|
|
|
e->bitfield = cpu_to_be16(RUNNING << 13);
|
|
|
|
if (head) {
|
|
while (head->next)
|
|
head = head->next;
|
|
|
|
head->next = e;
|
|
}
|
|
|
|
return e;
|
|
}
|
|
|
|
void vidtv_psi_eit_event_destroy(struct vidtv_psi_table_eit_event *e)
|
|
{
|
|
struct vidtv_psi_table_eit_event *tmp_e = NULL;
|
|
struct vidtv_psi_table_eit_event *curr_e = e;
|
|
|
|
while (curr_e) {
|
|
tmp_e = curr_e;
|
|
curr_e = curr_e->next;
|
|
vidtv_psi_desc_destroy(tmp_e->descriptor);
|
|
kfree(tmp_e);
|
|
}
|
|
}
|
|
|
|
void vidtv_psi_eit_table_destroy(struct vidtv_psi_table_eit *eit)
|
|
{
|
|
vidtv_psi_eit_event_destroy(eit->event);
|
|
kfree(eit);
|
|
}
|