// 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 #include #include #include #include #include #include #include #include #include #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; u16 ret; mask = GENMASK(11, 0); ret = be16_to_cpu(h->bitfield) & mask; return ret; } u16 vidtv_psi_get_pat_program_pid(struct vidtv_psi_table_pat_program *p) { u16 mask; u16 ret; mask = GENMASK(12, 0); ret = be16_to_cpu(p->bitfield) & mask; return ret; } u16 vidtv_psi_pmt_stream_get_elem_pid(struct vidtv_psi_table_pmt_stream *s) { u16 mask; u16 ret; mask = GENMASK(12, 0); ret = be16_to_cpu(s->bitfield) & mask; return ret; } 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); 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(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); 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(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 (!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(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); }