diff options
Diffstat (limited to 'drivers/media/test-drivers/vidtv/vidtv_psi.c')
| -rw-r--r-- | drivers/media/test-drivers/vidtv/vidtv_psi.c | 1322 |
1 files changed, 1322 insertions, 0 deletions
diff --git a/drivers/media/test-drivers/vidtv/vidtv_psi.c b/drivers/media/test-drivers/vidtv/vidtv_psi.c new file mode 100644 index 000000000000..82cf67dd27c0 --- /dev/null +++ b/drivers/media/test-drivers/vidtv/vidtv_psi.c @@ -0,0 +1,1322 @@ +// 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. + * + * This code currently supports three tables: PAT, PMT and SDT. These are the + * bare minimum to get userspace to recognize our MPEG transport stream. It can + * be extended to support more PSI tables in the future. + * + * Copyright (C) 2020 Daniel W. S. Almeida + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ":%s, %d: " fmt, __func__, __LINE__ + +#include <linux/kernel.h> +#include <linux/types.h> +#include <linux/slab.h> +#include <linux/crc32.h> +#include <linux/string.h> +#include <linux/printk.h> +#include <linux/ratelimit.h> +#include <linux/string.h> +#include <asm/byteorder.h> + +#include "vidtv_psi.h" +#include "vidtv_common.h" +#include "vidtv_ts.h" + +#define CRC_SIZE_IN_BYTES 4 +#define MAX_VERSION_NUM 32 + +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 inline 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 inline u16 vidtv_psi_sdt_serv_get_desc_loop_len(struct vidtv_psi_table_sdt_service *s) +{ + u16 mask; + u16 ret; + + mask = GENMASK(11, 0); + + ret = be16_to_cpu(s->bitfield) & mask; + return ret; +} + +static inline u16 vidtv_psi_pmt_stream_get_desc_loop_len(struct vidtv_psi_table_pmt_stream *s) +{ + u16 mask; + u16 ret; + + mask = GENMASK(9, 0); + + ret = be16_to_cpu(s->bitfield2) & mask; + return ret; +} + +static inline u16 vidtv_psi_pmt_get_desc_loop_len(struct vidtv_psi_table_pmt *p) +{ + u16 mask; + u16 ret; + + mask = GENMASK(9, 0); + + ret = be16_to_cpu(p->bitfield2) & mask; + return ret; +} + +static inline 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; +} + +inline 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; +} + +inline 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 inline void vidtv_psi_set_desc_loop_len(__be16 *bitfield, u16 new_len, u8 desc_len_nbits) +{ + u16 mask; + __be16 new; + + 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; +} + +static u32 vidtv_psi_ts_psi_write_into(struct psi_write_args args) +{ + /* + * 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 + */ + + u32 nbytes_past_boundary = (args.dest_offset % TS_PACKET_LEN); + bool aligned = (nbytes_past_boundary == 0); + struct vidtv_mpeg_ts ts_header = {}; + + /* number of bytes written by this function */ + u32 nbytes = 0; + /* how much there is left to write */ + u32 remaining_len = args.len; + /* how much we can be written in this packet */ + u32 payload_write_len = 0; + /* where we are in the source */ + u32 payload_offset = 0; + + const u16 PAYLOAD_START = args.new_psi_section; + + 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.sync_byte = TS_SYNC_BYTE; + ts_header.bitfield = cpu_to_be16((PAYLOAD_START << 14) | args.pid); + ts_header.scrambling = 0; + ts_header.continuity_counter = *args.continuity_counter; + ts_header.payload = 1; + /* no adaptation field */ + ts_header.adaptation_field = 0; + + /* copy the header */ + 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) +{ + /* the CRC is the last entry in the section */ + u32 nbytes = 0; + struct psi_write_args psi_args = {}; + + psi_args.dest_buf = args.dest_buf; + psi_args.from = &args.crc; + psi_args.len = CRC_SIZE_IN_BYTES; + psi_args.dest_offset = args.dest_offset; + psi_args.pid = args.pid; + psi_args.new_psi_section = false; + psi_args.continuity_counter = args.continuity_counter; + psi_args.is_crc = true; + psi_args.dest_buf_sz = args.dest_buf_sz; + + nbytes += vidtv_psi_ts_psi_write_into(psi_args); + + return nbytes; +} + +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); + + 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); + + if (head) { + while (head->next) + head = head->next; + + head->next = (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); + + 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); + + if (head) { + while (head->next) + head = head->next; + + head->next = (struct vidtv_psi_desc *)desc; + } + + return desc; +} + +struct vidtv_psi_desc *vidtv_psi_desc_clone(struct vidtv_psi_desc *desc) +{ + struct vidtv_psi_desc *head = NULL; + struct vidtv_psi_desc *prev = NULL; + struct vidtv_psi_desc *curr = NULL; + + struct vidtv_psi_desc_service *service; + + 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 REGISTRATION_DESCRIPTOR: + default: + curr = kzalloc(sizeof(*desc) + desc->length, GFP_KERNEL); + memcpy(curr, desc, sizeof(*desc) + desc->length); + break; + } + + if (curr) + 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 *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; + + 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) +{ + /* the number of bytes written by this function */ + u32 nbytes = 0; + struct psi_write_args psi_args = {}; + + psi_args.dest_buf = args.dest_buf; + psi_args.from = &args.desc->type; + + psi_args.len = sizeof_field(struct vidtv_psi_desc, type) + + sizeof_field(struct vidtv_psi_desc, length); + + psi_args.dest_offset = args.dest_offset + nbytes; + psi_args.pid = args.pid; + psi_args.new_psi_section = false; + psi_args.continuity_counter = args.continuity_counter; + psi_args.is_crc = false; + psi_args.dest_buf_sz = args.dest_buf_sz; + psi_args.crc = args.crc; + + 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 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) +{ + /* the number of bytes written by this function */ + u32 nbytes = 0; + struct psi_write_args psi_args = {}; + + psi_args.dest_buf = args.dest_buf; + psi_args.from = args.h; + psi_args.len = sizeof(struct vidtv_psi_table_header); + psi_args.dest_offset = args.dest_offset; + psi_args.pid = args.pid; + psi_args.new_psi_section = true; + psi_args.continuity_counter = args.continuity_counter; + psi_args.is_crc = false; + psi_args.dest_buf_sz = args.dest_buf_sz; + psi_args.crc = args.crc; + + nbytes += vidtv_psi_ts_psi_write_into(psi_args); + + return nbytes; +} + +void +vidtv_psi_pat_table_update_sec_len(struct vidtv_psi_table_pat *pat) +{ + /* see ISO/IEC 13818-1 : 2000 p.43 */ + u16 length = 0; + u32 i; + + /* 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->programs; ++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) +{ + /* see ISO/IEC 13818-1 : 2000 p.46 */ + u16 length = 0; + struct vidtv_psi_table_pmt_stream *s = pmt->stream; + u16 desc_loop_len; + + /* 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) +{ + /* see ETSI EN 300 468 V 1.10.1 p.24 */ + u16 length = 0; + struct vidtv_psi_table_sdt_service *s = sdt->service; + u16 desc_loop_len; + + /* + * 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); + + 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 *curr = p; + struct vidtv_psi_table_pat_program *tmp = NULL; + + while (curr) { + tmp = curr; + curr = curr->next; + kfree(tmp); + } +} + +void +vidtv_psi_pat_program_assign(struct vidtv_psi_table_pat *pat, + struct vidtv_psi_table_pat_program *p) +{ + /* This function transfers ownership of p to the table */ + + u16 program_count = 0; + struct vidtv_psi_table_pat_program *program = p; + + if (p == pat->program) + return; + + while (program) { + ++program_count; + program = program->next; + } + + pat->programs = program_count; + pat->program = p; + + /* Recompute section length */ + vidtv_psi_pat_table_update_sec_len(pat); + + if (vidtv_psi_get_sec_len(&pat->header) > MAX_SECTION_LEN) + vidtv_psi_pat_program_assign(pat, NULL); + + 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 = kzalloc(sizeof(*pat), GFP_KERNEL); + const u16 SYNTAX = 0x1; + const u16 ZERO = 0x0; + const u16 ONES = 0x03; + + 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; + + pat->programs = 0; + + vidtv_psi_pat_table_update_sec_len(pat); + + return pat; +} + +u32 vidtv_psi_pat_write_into(struct vidtv_psi_pat_write_args args) +{ + /* the number of bytes written by this function */ + u32 nbytes = 0; + const u16 pat_pid = VIDTV_PAT_PID; + u32 crc = 0xffffffff; + + struct vidtv_psi_table_pat_program *p = args.pat->program; + + struct header_write_args h_args = {}; + struct psi_write_args psi_args = {}; + struct crc32_write_args c_args = {}; + + vidtv_psi_pat_table_update_sec_len(args.pat); + + h_args.dest_buf = args.buf; + h_args.dest_offset = args.offset; + h_args.h = &args.pat->header; + h_args.pid = pat_pid; + h_args.continuity_counter = args.continuity_counter; + h_args.dest_buf_sz = args.buf_sz; + 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.dest_buf = args.buf; + psi_args.pid = pat_pid; + psi_args.new_psi_section = false; + psi_args.continuity_counter = args.continuity_counter; + psi_args.is_crc = false; + psi_args.dest_buf_sz = args.buf_sz; + 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; + + nbytes += vidtv_psi_ts_psi_write_into(psi_args); + + p = p->next; + } + + c_args.dest_buf = args.buf; + c_args.dest_offset = args.offset + nbytes; + c_args.crc = cpu_to_be32(crc); + c_args.pid = pat_pid; + c_args.continuity_counter = args.continuity_counter; + c_args.dest_buf_sz = args.buf_sz; + + /* 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); + + 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 *curr_stream = s; + struct vidtv_psi_table_pmt_stream *tmp_stream = NULL; + + 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) +{ + /* 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); + + if (vidtv_psi_get_sec_len(&pmt->header) > MAX_SECTION_LEN) + vidtv_psi_pmt_stream_assign(pmt, NULL); + + 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 = kzalloc(sizeof(*pmt), GFP_KERNEL); + const u16 SYNTAX = 0x1; + const u16 ZERO = 0x0; + const u16 ONES = 0x03; + const u16 RESERVED1 = 0x07; + const u16 RESERVED2 = 0x0f; + u16 desc_loop_len; + + 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) +{ + /* the number of bytes written by this function */ + u32 nbytes = 0; + u32 crc = 0xffffffff; + + 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 = (stream) ? + args.pmt->stream->descriptor : + NULL; + + struct header_write_args h_args = {}; + struct psi_write_args psi_args = {}; + struct desc_write_args d_args = {}; + struct crc32_write_args c_args = {}; + + vidtv_psi_pmt_table_update_sec_len(args.pmt); + + h_args.dest_buf = args.buf; + h_args.dest_offset = args.offset; + h_args.h = &args.pmt->header; + h_args.pid = args.pid; + h_args.continuity_counter = args.continuity_counter; + h_args.dest_buf_sz = args.buf_sz; + h_args.crc = &crc; + + nbytes += vidtv_psi_table_header_write_into(h_args); + + /* write the two bitfields */ + psi_args.dest_buf = args.buf; + psi_args.from = &args.pmt->bitfield; + psi_args.len = sizeof_field(struct vidtv_psi_table_pmt, bitfield) + + sizeof_field(struct vidtv_psi_table_pmt, bitfield2); + + psi_args.dest_offset = args.offset + nbytes; + psi_args.pid = args.pid; + psi_args.new_psi_section = false; + psi_args.continuity_counter = args.continuity_counter; + psi_args.is_crc = false; + psi_args.dest_buf_sz = args.buf_sz; + psi_args.crc = &crc; + + nbytes += vidtv_psi_ts_psi_write_into(psi_args); + + while (table_descriptor) { + /* write the descriptors, if any */ + d_args.dest_buf = args.buf; + d_args.dest_offset = args.offset + nbytes; + d_args.desc = table_descriptor; + d_args.pid = args.pid; + d_args.continuity_counter = args.continuity_counter; + d_args.dest_buf_sz = args.buf_sz; + d_args.crc = &crc; + + nbytes += vidtv_psi_desc_write_into(d_args); + + table_descriptor = table_descriptor->next; + } + + while (stream) { + /* write the streams, if any */ + psi_args.from = stream; + psi_args.len = sizeof_field(struct vidtv_psi_table_pmt_stream, type) + + sizeof_field(struct vidtv_psi_table_pmt_stream, bitfield) + + sizeof_field(struct vidtv_psi_table_pmt_stream, bitfield2); + psi_args.dest_offset = args.offset + nbytes; + + nbytes += vidtv_psi_ts_psi_write_into(psi_args); + + while (stream_descriptor) { + /* write the stream descriptors, if any */ + d_args.dest_buf = args.buf; + d_args.dest_offset = args.offset + nbytes; + d_args.desc = stream_descriptor; + d_args.pid = args.pid; + d_args.continuity_counter = args.continuity_counter; + d_args.dest_buf_sz = args.buf_sz; + d_args.crc = &crc; + + nbytes += vidtv_psi_desc_write_into(d_args); + + stream_descriptor = stream_descriptor->next; + } + + stream = stream->next; + } + + c_args.dest_buf = args.buf; + c_args.dest_offset = args.offset + nbytes; + c_args.crc = cpu_to_be32(crc); + c_args.pid = args.pid; + c_args.continuity_counter = args.continuity_counter; + c_args.dest_buf_sz = args.buf_sz; + + /* 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 transport_stream_id) +{ + struct vidtv_psi_table_sdt *sdt = kzalloc(sizeof(*sdt), GFP_KERNEL); + const u16 SYNTAX = 0x1; + const u16 ONE = 0x1; + const u16 ONES = 0x03; + const u16 RESERVED = 0xff; + + 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(0xff01); + 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) +{ + u32 nbytes = 0; + u16 sdt_pid = VIDTV_SDT_PID; /* see ETSI EN 300 468 v1.15.1 p. 11 */ + + u32 crc = 0xffffffff; + + struct vidtv_psi_table_sdt_service *service = args.sdt->service; + struct vidtv_psi_desc *service_desc = (args.sdt->service) ? + args.sdt->service->descriptor : + NULL; + + struct header_write_args h_args = {}; + struct psi_write_args psi_args = {}; + struct desc_write_args d_args = {}; + struct crc32_write_args c_args = {}; + + vidtv_psi_sdt_table_update_sec_len(args.sdt); + + h_args.dest_buf = args.buf; + h_args.dest_offset = args.offset; + h_args.h = &args.sdt->header; + h_args.pid = sdt_pid; + h_args.continuity_counter = args.continuity_counter; + h_args.dest_buf_sz = args.buf_sz; + h_args.crc = &crc; + + nbytes += vidtv_psi_table_header_write_into(h_args); + + psi_args.dest_buf = args.buf; + psi_args.from = &args.sdt->network_id; + + psi_args.len = sizeof_field(struct vidtv_psi_table_sdt, network_id) + + sizeof_field(struct vidtv_psi_table_sdt, reserved); + + psi_args.dest_offset = args.offset + nbytes; + psi_args.pid = sdt_pid; + psi_args.new_psi_section = false; + psi_args.continuity_counter = args.continuity_counter; + psi_args.is_crc = false; + psi_args.dest_buf_sz = args.buf_sz; + psi_args.crc = &crc; + + /* copy u16 network_id + u8 reserved)*/ + nbytes += vidtv_psi_ts_psi_write_into(psi_args); + + while (service) { + /* copy the services, if any */ + psi_args.from = service; + /* 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 *); + psi_args.dest_offset = args.offset + nbytes; + + nbytes += vidtv_psi_ts_psi_write_into(psi_args); + + while (service_desc) { + /* copy the service descriptors, if any */ + d_args.dest_buf = args.buf; + d_args.dest_offset = args.offset + nbytes; + d_args.desc = service_desc; + d_args.pid = sdt_pid; + d_args.continuity_counter = args.continuity_counter; + d_args.dest_buf_sz = args.buf_sz; + d_args.crc = &crc; + + nbytes += vidtv_psi_desc_write_into(d_args); + + service_desc = service_desc->next; + } + + service = service->next; + } + + c_args.dest_buf = args.buf; + c_args.dest_offset = args.offset + nbytes; + c_args.crc = cpu_to_be32(crc); + c_args.pid = sdt_pid; + c_args.continuity_counter = args.continuity_counter; + c_args.dest_buf_sz = args.buf_sz; + + /* 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) +{ + struct vidtv_psi_table_sdt_service *service; + + service = kzalloc(sizeof(*service), GFP_KERNEL); + + /* + * 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 = 0x0; + service->EIT_present_following = 0x0; + 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) +{ + if (service == sdt->service) + return; + + sdt->service = service; + + /* recompute section length */ + vidtv_psi_sdt_table_update_sec_len(sdt); + + if (vidtv_psi_get_sec_len(&sdt->header) > MAX_SECTION_LEN) + vidtv_psi_sdt_service_assign(sdt, NULL); + + vidtv_psi_update_version_num(&sdt->header); +} + +struct vidtv_psi_table_pmt** +vidtv_psi_pmt_create_sec_for_each_pat_entry(struct vidtv_psi_table_pat *pat, u16 pcr_pid) + +{ + /* + * 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_pat_program *program = pat->program; + struct vidtv_psi_table_pmt **pmt_secs; + u32 i = 0; + + /* a section for each program_id */ + pmt_secs = kcalloc(pat->programs, + sizeof(struct vidtv_psi_table_pmt *), + GFP_KERNEL); + + while (program) { + pmt_secs[i] = vidtv_psi_pmt_table_init(be16_to_cpu(program->service_id), pcr_pid); + ++i; + program = program->next; + } + + return pmt_secs; +} + +struct vidtv_psi_table_pmt +*vidtv_psi_find_pmt_sec(struct vidtv_psi_table_pmt **pmt_sections, + u16 nsections, + u16 program_num) +{ + /* find the PMT section associated with '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 */ +} |