tresor.bessoh
/
linuxdebug
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
linuxdebug/drivers/media/test-drivers/vidtv/vidtv_psi.c

2019 lines
55 KiB
C
Raw Normal View History

null pointer error
2024-07-16 15:50:57 +02:00
// 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 const u32 CRC_LUT[256] = {
/* from libdvbv5 */
0x00000000, 0x04c11db7, 0x09823b6e, 0x0d4326d9, 0x130476dc, 0x17c56b6b,
0x1a864db2, 0x1e475005, 0x2608edb8, 0x22c9f00f, 0x2f8ad6d6, 0x2b4bcb61,
0x350c9b64, 0x31cd86d3, 0x3c8ea00a, 0x384fbdbd, 0x4c11db70, 0x48d0c6c7,
0x4593e01e, 0x4152fda9, 0x5f15adac, 0x5bd4b01b, 0x569796c2, 0x52568b75,
0x6a1936c8, 0x6ed82b7f, 0x639b0da6, 0x675a1011, 0x791d4014, 0x7ddc5da3,
0x709f7b7a, 0x745e66cd, 0x9823b6e0, 0x9ce2ab57, 0x91a18d8e, 0x95609039,
0x8b27c03c, 0x8fe6dd8b, 0x82a5fb52, 0x8664e6e5, 0xbe2b5b58, 0xbaea46ef,
0xb7a96036, 0xb3687d81, 0xad2f2d84, 0xa9ee3033, 0xa4ad16ea, 0xa06c0b5d,
0xd4326d90, 0xd0f37027, 0xddb056fe, 0xd9714b49, 0xc7361b4c, 0xc3f706fb,
0xceb42022, 0xca753d95, 0xf23a8028, 0xf6fb9d9f, 0xfbb8bb46, 0xff79a6f1,
0xe13ef6f4, 0xe5ffeb43, 0xe8bccd9a, 0xec7dd02d, 0x34867077, 0x30476dc0,
0x3d044b19, 0x39c556ae, 0x278206ab, 0x23431b1c, 0x2e003dc5, 0x2ac12072,
0x128e9dcf, 0x164f8078, 0x1b0ca6a1, 0x1fcdbb16, 0x018aeb13, 0x054bf6a4,
0x0808d07d, 0x0cc9cdca, 0x7897ab07, 0x7c56b6b0, 0x71159069, 0x75d48dde,
0x6b93dddb, 0x6f52c06c, 0x6211e6b5, 0x66d0fb02, 0x5e9f46bf, 0x5a5e5b08,
0x571d7dd1, 0x53dc6066, 0x4d9b3063, 0x495a2dd4, 0x44190b0d, 0x40d816ba,
0xaca5c697, 0xa864db20, 0xa527fdf9, 0xa1e6e04e, 0xbfa1b04b, 0xbb60adfc,
0xb6238b25, 0xb2e29692, 0x8aad2b2f, 0x8e6c3698, 0x832f1041, 0x87ee0df6,
0x99a95df3, 0x9d684044, 0x902b669d, 0x94ea7b2a, 0xe0b41de7, 0xe4750050,
0xe9362689, 0xedf73b3e, 0xf3b06b3b, 0xf771768c, 0xfa325055, 0xfef34de2,
0xc6bcf05f, 0xc27dede8, 0xcf3ecb31, 0xcbffd686, 0xd5b88683, 0xd1799b34,
0xdc3abded, 0xd8fba05a, 0x690ce0ee, 0x6dcdfd59, 0x608edb80, 0x644fc637,
0x7a089632, 0x7ec98b85, 0x738aad5c, 0x774bb0eb, 0x4f040d56, 0x4bc510e1,
0x46863638, 0x42472b8f, 0x5c007b8a, 0x58c1663d, 0x558240e4, 0x51435d53,
0x251d3b9e, 0x21dc2629, 0x2c9f00f0, 0x285e1d47, 0x36194d42, 0x32d850f5,
0x3f9b762c, 0x3b5a6b9b, 0x0315d626, 0x07d4cb91, 0x0a97ed48, 0x0e56f0ff,
0x1011a0fa, 0x14d0bd4d, 0x19939b94, 0x1d528623, 0xf12f560e, 0xf5ee4bb9,
0xf8ad6d60, 0xfc6c70d7, 0xe22b20d2, 0xe6ea3d65, 0xeba91bbc, 0xef68060b,
0xd727bbb6, 0xd3e6a601, 0xdea580d8, 0xda649d6f, 0xc423cd6a, 0xc0e2d0dd,
0xcda1f604, 0xc960ebb3, 0xbd3e8d7e, 0xb9ff90c9, 0xb4bcb610, 0xb07daba7,
0xae3afba2, 0xaafbe615, 0xa7b8c0cc, 0xa379dd7b, 0x9b3660c6, 0x9ff77d71,
0x92b45ba8, 0x9675461f, 0x8832161a, 0x8cf30bad, 0x81b02d74, 0x857130c3,
0x5d8a9099, 0x594b8d2e, 0x5408abf7, 0x50c9b640, 0x4e8ee645, 0x4a4ffbf2,
0x470cdd2b, 0x43cdc09c, 0x7b827d21, 0x7f436096, 0x7200464f, 0x76c15bf8,
0x68860bfd, 0x6c47164a, 0x61043093, 0x65c52d24, 0x119b4be9, 0x155a565e,
0x18197087, 0x1cd86d30, 0x029f3d35, 0x065e2082, 0x0b1d065b, 0x0fdc1bec,
0x3793a651, 0x3352bbe6, 0x3e119d3f, 0x3ad08088, 0x2497d08d, 0x2056cd3a,
0x2d15ebe3, 0x29d4f654, 0xc5a92679, 0xc1683bce, 0xcc2b1d17, 0xc8ea00a0,
0xd6ad50a5, 0xd26c4d12, 0xdf2f6bcb, 0xdbee767c, 0xe3a1cbc1, 0xe760d676,
0xea23f0af, 0xeee2ed18, 0xf0a5bd1d, 0xf464a0aa, 0xf9278673, 0xfde69bc4,
0x89b8fd09, 0x8d79e0be, 0x803ac667, 0x84fbdbd0, 0x9abc8bd5, 0x9e7d9662,
0x933eb0bb, 0x97ffad0c, 0xafb010b1, 0xab710d06, 0xa6322bdf, 0xa2f33668,
0xbcb4666d, 0xb8757bda, 0xb5365d03, 0xb1f740b4
};
static u32 dvb_crc32(u32 crc, u8 *data, u32 len)
{
/* from libdvbv5 */
while (len--)
crc = (crc << 8) ^ CRC_LUT[((crc >> 24) ^ *data++) & 0xff];
return crc;
}
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 = dvb_crc32(*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(sizeof(*desc), GFP_KERNEL);
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);
desc->provider_name_len = provider_name_len;
if (provider_name && provider_name_len)
desc->provider_name = kstrdup(provider_name, GFP_KERNEL);
vidtv_psi_desc_chain(head, (struct vidtv_psi_desc *)desc);
return desc;
}
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(sizeof(*desc), GFP_KERNEL);
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);
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(sizeof(*desc), GFP_KERNEL);
if (!desc)
return NULL;
desc->type = SERVICE_LIST_DESCRIPTOR;
while (entry) {
curr_e = kzalloc(sizeof(*curr_e), GFP_KERNEL);
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(sizeof(*desc), GFP_KERNEL);
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 (event_name && event_name_len)
desc->event_name = kstrdup(event_name, GFP_KERNEL);
if (text && text_len)
desc->text = kstrdup(text, GFP_KERNEL);
vidtv_psi_desc_chain(head, (struct vidtv_psi_desc *)desc);
return desc;
}
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(sizeof(*program), GFP_KERNEL);
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(sizeof(*pat), GFP_KERNEL);
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(sizeof(*stream), GFP_KERNEL);
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(sizeof(*pmt), GFP_KERNEL);
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(sizeof(*sdt), GFP_KERNEL);
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(sizeof(*service), GFP_KERNEL);
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 = kcalloc(num_pmt,
sizeof(struct vidtv_psi_table_pmt *),
GFP_KERNEL);
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(sizeof(*nit), GFP_KERNEL);
if (!nit)
return NULL;
transport = kzalloc(sizeof(*transport), GFP_KERNEL);
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(sizeof(*eit), GFP_KERNEL);
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)
{
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(sizeof(*e), GFP_KERNEL);
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);
}