Because the generator is implemented in a separate file, it can be
reused elsewhere in the media subsystem.
- Currently vidtv supports working with 4 PSI tables: PAT, PMT,
- SDT and NIT.
+ Currently vidtv supports working with 5 PSI tables: PAT, PMT,
+ SDT, NIT and EIT.
The specification for PAT and PMT can be found in *ISO 13818-1:
- Systems*, while the specification for the SDT, NIT can be found in *ETSI
+ Systems*, while the specification for the SDT, NIT, EIT can be found in *ETSI
EN 300 468: Specification for Service Information (SI) in DVB
systems*.
#. Their programs will be concatenated to populate the PAT
+ #. Their events will be concatenated to populate the EIT
+
#. For each program in the PAT, a PMT section will be created
#. The PMT section for a channel will be assigned its streams.
* When vidtv boots, it will create some hardcoded channels.
* Their services will be concatenated to populate the SDT.
* Their programs will be concatenated to populate the PAT
+ * Their events will be concatenated to populate the EIT
* For each program in the PAT, a PMT section will be created
* The PMT section for a channel will be assigned its streams.
* Every stream will have its corresponding encoder polled to produce TS packets
char *name = ENCODING_ISO8859_15 "Beethoven";
char *provider = ENCODING_ISO8859_15 "LinuxTV.org";
+ char *iso_language_code = ENCODING_ISO8859_15 "eng";
+ char *event_name = ENCODING_ISO8859_15 "Beethoven Music";
+ char *event_text = ENCODING_ISO8859_15 "Beethoven's 5th Symphony";
+ const u16 s302m_beethoven_event_id = 1;
struct vidtv_channel *s302m = kzalloc(sizeof(*s302m), GFP_KERNEL);
struct vidtv_s302m_encoder_init_args encoder_args = {};
s302m->name = kstrdup(name, GFP_KERNEL);
- s302m->service = vidtv_psi_sdt_service_init(NULL, s302m_service_id);
+ s302m->service = vidtv_psi_sdt_service_init(NULL, s302m_service_id, false, true);
s302m->service->descriptor = (struct vidtv_psi_desc *)
vidtv_psi_service_desc_init(NULL,
s302m->encoders = vidtv_s302m_encoder_init(encoder_args);
+ s302m->events = vidtv_psi_eit_event_init(NULL, s302m_beethoven_event_id);
+ s302m->events->descriptor = (struct vidtv_psi_desc *)
+ vidtv_psi_short_event_desc_init(NULL,
+ iso_language_code,
+ event_name,
+ event_text);
+
if (head) {
while (head->next)
head = head->next;
return s302m;
}
+static struct vidtv_psi_table_eit_event
+*vidtv_channel_eit_event_cat_into_new(struct vidtv_mux *m)
+{
+ /* Concatenate the events */
+ const struct vidtv_channel *cur_chnl = m->channels;
+
+ struct vidtv_psi_table_eit_event *curr = NULL;
+ struct vidtv_psi_table_eit_event *head = NULL;
+ struct vidtv_psi_table_eit_event *tail = NULL;
+
+ struct vidtv_psi_desc *desc = NULL;
+ u16 event_id;
+
+ if (!cur_chnl)
+ return NULL;
+
+ while (cur_chnl) {
+ curr = cur_chnl->events;
+
+ if (!curr)
+ dev_warn_ratelimited(m->dev,
+ "No events found for channel %s\n", cur_chnl->name);
+
+ while (curr) {
+ event_id = be16_to_cpu(curr->event_id);
+ tail = vidtv_psi_eit_event_init(tail, event_id);
+
+ desc = vidtv_psi_desc_clone(curr->descriptor);
+ vidtv_psi_desc_assign(&tail->descriptor, desc);
+
+ if (!head)
+ head = tail;
+
+ curr = curr->next;
+ }
+
+ cur_chnl = cur_chnl->next;
+ }
+
+ return head;
+}
+
static struct vidtv_psi_table_sdt_service
*vidtv_channel_sdt_serv_cat_into_new(struct vidtv_mux *m)
{
while (curr) {
service_id = be16_to_cpu(curr->service_id);
- tail = vidtv_psi_sdt_service_init(tail, service_id);
+ tail = vidtv_psi_sdt_service_init(tail,
+ service_id,
+ curr->EIT_schedule,
+ curr->EIT_present_following);
desc = vidtv_psi_desc_clone(curr->descriptor);
vidtv_psi_desc_assign(&tail->descriptor, desc);
struct vidtv_psi_table_pat_program *programs = NULL;
struct vidtv_psi_table_sdt_service *services = NULL;
struct vidtv_psi_desc_service_list_entry *service_list = NULL;
+ struct vidtv_psi_table_eit_event *events = NULL;
m->si.pat = vidtv_psi_pat_table_init(m->transport_stream_id);
programs = vidtv_channel_pat_prog_cat_into_new(m);
services = vidtv_channel_sdt_serv_cat_into_new(m);
+ events = vidtv_channel_eit_event_cat_into_new(m);
+
/* look for a service descriptor for every service */
service_list = vidtv_channel_build_service_list(services);
m->network_name,
service_list);
+ m->si.eit = vidtv_psi_eit_table_init(m->network_id, m->transport_stream_id);
+
/* assemble all programs and assign to PAT */
vidtv_psi_pat_program_assign(m->si.pat, programs);
/* assemble all services and assign to SDT */
vidtv_psi_sdt_service_assign(m->si.sdt, services);
+ /* assemble all events and assign to EIT */
+ vidtv_psi_eit_event_assign(m->si.eit, events);
+
m->si.pmt_secs = vidtv_psi_pmt_create_sec_for_each_pat_entry(m->si.pat, m->pcr_pid);
vidtv_channel_pmt_match_sections(m->channels,
kfree(m->si.pmt_secs);
vidtv_psi_sdt_table_destroy(m->si.sdt);
vidtv_psi_nit_table_destroy(m->si.nit);
+ vidtv_psi_eit_table_destroy(m->si.eit);
}
void vidtv_channels_init(struct vidtv_mux *m)
vidtv_psi_pat_program_destroy(curr->program);
vidtv_psi_pmt_stream_destroy(curr->streams);
vidtv_channel_encoder_destroy(curr->encoders);
+ vidtv_psi_eit_event_destroy(curr->events);
tmp = curr;
curr = curr->next;
* When vidtv boots, it will create some hardcoded channels.
* Their services will be concatenated to populate the SDT.
* Their programs will be concatenated to populate the PAT
+ * Their events will be concatenated to populate the EIT
* For each program in the PAT, a PMT section will be created
* The PMT section for a channel will be assigned its streams.
* Every stream will have its corresponding encoder polled to produce TS packets
* Will be concatenated into the PAT.
* @streams: A stream loop used to populate the PMT section for 'program'
* @encoders: A encoder loop. There must be one encoder for each stream.
+ * @events: Optional event information. This will feed into the EIT.
* @next: Optionally chain this channel.
*/
struct vidtv_channel {
struct vidtv_psi_table_pat_program *program;
struct vidtv_psi_table_pmt_stream *streams;
struct vidtv_encoder *encoders;
+ struct vidtv_psi_table_eit_event *events;
struct vidtv_channel *next;
};
vidtv_mux_create_pid_ctx_once(m, VIDTV_SDT_PID);
/* push the NIT pid ctx */
vidtv_mux_create_pid_ctx_once(m, VIDTV_NIT_PID);
+ /* push the EIT pid ctx */
+ vidtv_mux_create_pid_ctx_once(m, VIDTV_EIT_PID);
/* add a ctx for all PMT sections */
while (p) {
struct vidtv_mux_pid_ctx *pmt_ctx;
struct vidtv_mux_pid_ctx *sdt_ctx;
struct vidtv_mux_pid_ctx *nit_ctx;
+ struct vidtv_mux_pid_ctx *eit_ctx;
struct vidtv_psi_pat_write_args pat_args = {};
struct vidtv_psi_pmt_write_args pmt_args = {};
struct vidtv_psi_sdt_write_args sdt_args = {};
struct vidtv_psi_nit_write_args nit_args = {};
+ struct vidtv_psi_eit_write_args eit_args = {};
u32 nbytes; /* the number of bytes written by this function */
u16 pmt_pid;
pat_ctx = vidtv_mux_get_pid_ctx(m, VIDTV_PAT_PID);
sdt_ctx = vidtv_mux_get_pid_ctx(m, VIDTV_SDT_PID);
nit_ctx = vidtv_mux_get_pid_ctx(m, VIDTV_NIT_PID);
+ eit_ctx = vidtv_mux_get_pid_ctx(m, VIDTV_EIT_PID);
pat_args.buf = m->mux_buf;
pat_args.offset = m->mux_buf_offset;
m->mux_buf_offset += vidtv_psi_nit_write_into(nit_args);
+ eit_args.buf = m->mux_buf;
+ eit_args.offset = m->mux_buf_offset;
+ eit_args.eit = m->si.eit;
+ eit_args.buf_sz = m->mux_buf_sz;
+ eit_args.continuity_counter = &eit_ctx->cc;
+
+ m->mux_buf_offset += vidtv_psi_eit_write_into(eit_args);
+
nbytes = m->mux_buf_offset - initial_offset;
m->num_streamed_si++;
* @pat: The PAT in use by the muxer.
* @pmt_secs: The PMT sections in use by the muxer. One for each program in the PAT.
* @sdt: The SDT in use by the muxer.
+ * @eit: the EIT in use by the muxer.
*/
struct vidtv_mux_si {
/* the SI tables */
struct vidtv_psi_table_pmt **pmt_secs; /* the PMT sections */
struct vidtv_psi_table_sdt *sdt;
struct vidtv_psi_table_nit *nit;
+ struct vidtv_psi_table_eit *eit;
};
/**
#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 */
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)
+{
+ struct vidtv_psi_desc_short_event *desc;
+ u32 event_name_len = event_name ? strlen(event_name) : 0;
+ u32 text_len = text ? strlen(text) : 0;
+ u32 iso_len = iso_language_code ? strlen(iso_language_code) : 0;
+
+ desc = kzalloc(sizeof(*desc), GFP_KERNEL);
+
+ 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);
+
+ 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_service *service;
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;
while (desc) {
switch (desc->type) {
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 = kzalloc(sizeof(*desc) + desc->length, GFP_KERNEL);
}
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;
+ 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;
struct vidtv_psi_table_sdt_service
*vidtv_psi_sdt_service_init(struct vidtv_psi_table_sdt_service *head,
- u16 service_id)
+ u16 service_id,
+ bool eit_schedule,
+ bool eit_present_following)
{
struct vidtv_psi_table_sdt_service *service;
* corresponding program_map_section
*/
service->service_id = cpu_to_be16(service_id);
- service->EIT_schedule = 0x0;
- service->EIT_present_following = 0x0;
+ service->EIT_schedule = eit_schedule;
+ service->EIT_present_following = eit_present_following;
service->reserved = 0x3f;
service->bitfield = cpu_to_be16(RUNNING << 13);
vidtv_psi_transport_destroy(nit->transport);
kfree(nit);
}
+
+void vidtv_psi_eit_table_update_sec_len(struct vidtv_psi_table_eit *eit)
+{
+ u16 length = 0;
+ struct vidtv_psi_table_eit_event *e = eit->event;
+ u16 desc_loop_len;
+
+ /*
+ * 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)
+{
+ if (e == eit->event)
+ return;
+
+ eit->event = e;
+ vidtv_psi_eit_table_update_sec_len(eit);
+
+ if (vidtv_psi_get_sec_len(&eit->header) > EIT_MAX_SECTION_LEN)
+ vidtv_psi_eit_event_assign(eit, NULL);
+
+ vidtv_psi_update_version_num(&eit->header);
+}
+
+struct vidtv_psi_table_eit
+*vidtv_psi_eit_table_init(u16 network_id,
+ u16 transport_stream_id)
+{
+ struct vidtv_psi_table_eit *eit = kzalloc(sizeof(*eit), GFP_KERNEL);
+
+ const u16 SYNTAX = 0x1;
+ const u16 ONE = 0x1;
+ const u16 ONES = 0x03;
+
+ 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 = cpu_to_be16(network_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)
+{
+ u32 nbytes = 0;
+ u32 crc = INITIAL_CRC;
+
+ struct vidtv_psi_table_eit_event *event = args.eit->event;
+ struct vidtv_psi_desc *event_descriptor = (args.eit->event) ?
+ args.eit->event->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_eit_table_update_sec_len(args.eit);
+
+ h_args.dest_buf = args.buf;
+ h_args.dest_offset = args.offset;
+ h_args.h = &args.eit->header;
+ h_args.pid = VIDTV_EIT_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.eit->transport_id;
+
+ psi_args.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);
+
+ psi_args.dest_offset = args.offset + nbytes;
+ psi_args.pid = VIDTV_EIT_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 (event) {
+ /* copy the events, if any */
+ psi_args.from = event;
+ /* 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 *);
+ 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_buf = args.buf;
+ d_args.dest_offset = args.offset + nbytes;
+ d_args.desc = event_descriptor;
+ d_args.pid = VIDTV_EIT_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);
+
+ event_descriptor = event_descriptor->next;
+ }
+
+ event = event->next;
+ }
+
+ c_args.dest_buf = args.buf;
+ c_args.dest_offset = args.offset + nbytes;
+ c_args.crc = cpu_to_be32(crc);
+ c_args.pid = VIDTV_EIT_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;
+}
+
+struct vidtv_psi_table_eit_event
+*vidtv_psi_eit_event_init(struct vidtv_psi_table_eit_event *head, u16 event_id)
+{
+ struct vidtv_psi_table_eit_event *e = kzalloc(sizeof(*e), GFP_KERNEL);
+ const u8 DURATION_ONE_HOUR[] = {1, 0, 0};
+
+ e->event_id = cpu_to_be16(event_id);
+ memset(e->start_time, 0xff, sizeof(e->start_time)); //todo: 0xff means 'unspecified'
+ memcpy(e->duration, DURATION_ONE_HOUR, sizeof(e->duration)); //todo, default to this for now
+
+ 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 *curr_e = e;
+ struct vidtv_psi_table_eit_event *tmp_e = NULL;
+
+ 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);
+}
#define PMT_LEN_UNTIL_PROGRAM_INFO_LENGTH 9
#define SDT_LEN_UNTIL_RESERVED_FOR_FUTURE_USE 8
#define NIT_LEN_UNTIL_NETWORK_DESCRIPTOR_LEN 7
+#define EIT_LEN_UNTIL_LAST_TABLE_ID 11
#define MAX_SECTION_LEN 1021
+#define EIT_MAX_SECTION_LEN 4093 /* see ETSI 300 468 v.1.10.1 p. 26 */
#define VIDTV_PAT_PID 0 /* mandated by the specs */
#define VIDTV_SDT_PID 0x0011 /* mandated by the specs */
#define VIDTV_NIT_PID 0x0010 /* mandated by the specs */
+#define VIDTV_EIT_PID 0x0012 /*mandated by the specs */
enum vidtv_psi_descriptors {
REGISTRATION_DESCRIPTOR = 0x05, /* See ISO/IEC 13818-1 section 2.6.8 */
NETWORK_NAME_DESCRIPTOR = 0x40, /* See ETSI EN 300 468 section 6.2.27 */
SERVICE_LIST_DESCRIPTOR = 0x41, /* See ETSI EN 300 468 section 6.2.35 */
SERVICE_DESCRIPTOR = 0x48, /* See ETSI EN 300 468 section 6.2.33 */
+ SHORT_EVENT_DESCRIPTOR = 0x4d, /* See ETSI EN 300 468 section 6.2.37 */
};
enum vidtv_psi_stream_types {
struct vidtv_psi_desc_service_list_entry *service_list;
} __packed;
+/**
+ * struct vidtv_psi_desc_short_event - A short event descriptor
+ * see ETSI EN 300 468 v1.15.1 section 6.2.37
+ */
+struct vidtv_psi_desc_short_event {
+ struct vidtv_psi_desc *next;
+ u8 type;
+ u8 length;
+ char *iso_language_code;
+ u8 event_name_len;
+ char *event_name;
+ u8 text_len;
+ char *text;
+} __packed;
+
+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);
+
/**
* struct vidtv_psi_table_header - A header that is present for all PSI tables.
*/
struct vidtv_psi_table_sdt_service*
vidtv_psi_sdt_service_init(struct vidtv_psi_table_sdt_service *head,
- u16 service_id);
+ u16 service_id,
+ bool eit_schedule,
+ bool eit_present_following);
void
vidtv_psi_desc_destroy(struct vidtv_psi_desc *desc);
void vidtv_psi_nit_table_destroy(struct vidtv_psi_table_nit *nit);
+/**
+ * struct vidtv_psi_desc_short_event - A short event descriptor
+ * see ETSI EN 300 468 v1.15.1 section 6.2.37
+ */
+struct vidtv_psi_table_eit_event {
+ __be16 event_id;
+ u8 start_time[5];
+ u8 duration[3];
+ __be16 bitfield; /* desc_length: 12, free_CA_mode: 1, running_status: 1 */
+ struct vidtv_psi_desc *descriptor;
+ struct vidtv_psi_table_eit_event *next;
+} __packed;
+
+/*
+ * struct vidtv_psi_table_eit - A Event Information Table (EIT)
+ * See ETSI 300 468 section 5.2.4
+ */
+struct vidtv_psi_table_eit {
+ struct vidtv_psi_table_header header;
+ __be16 transport_id;
+ __be16 network_id;
+ u8 last_segment;
+ u8 last_table_id;
+ struct vidtv_psi_table_eit_event *event;
+} __packed;
+
+struct vidtv_psi_table_eit
+*vidtv_psi_eit_table_init(u16 network_id,
+ u16 transport_stream_id);
+
+/**
+ * struct vidtv_psi_eit_write_args - Arguments for writing an EIT section
+ * @buf: The destination buffer.
+ * @offset: The offset into the destination buffer.
+ * @nit: A pointer to the NIT
+ * @buf_sz: The size of the destination buffer.
+ * @continuity_counter: A pointer to the CC. Incremented on every new packet.
+ *
+ */
+struct vidtv_psi_eit_write_args {
+ char *buf;
+ u32 offset;
+ struct vidtv_psi_table_eit *eit;
+ u32 buf_sz;
+ u8 *continuity_counter;
+};
+
+/**
+ * vidtv_psi_eit_write_into - Write EIT as MPEG-TS packets into a buffer.
+ * @args: an instance of struct vidtv_psi_nit_write_args
+ *
+ * This function writes the MPEG TS packets for a EIT table into a buffer.
+ * Calling code will usually generate the EIT via a call to its init function
+ * and thus is responsible for freeing it.
+ *
+ * Return: The number of bytes written into the buffer. This is NOT
+ * equal to the size of the EIT, since more space is needed for TS headers during TS
+ * encapsulation.
+ */
+u32 vidtv_psi_eit_write_into(struct vidtv_psi_eit_write_args args);
+
+void vidtv_psi_eit_table_destroy(struct vidtv_psi_table_eit *eit);
+
+/**
+ * vidtv_psi_eit_table_update_sec_len - Recompute and update the EIT section length.
+ * @eit: The EIT whose length is to be updated.
+ *
+ * This will traverse the table and accumulate the length of its components,
+ * which is then used to replace the 'section_length' field.
+ *
+ * If section_length > EIT_MAX_SECTION_LEN, the operation fails.
+ */
+void vidtv_psi_eit_table_update_sec_len(struct vidtv_psi_table_eit *eit);
+
+/**
+ * vidtv_psi_eit_event_assign - Assigns the event loop to the EIT.
+ * @eit: The EIT to assign to.
+ * @e: The event loop
+ *
+ * This will free the previous event loop in the table.
+ * This will assign ownership of the stream loop to the table, i.e. the table
+ * will free this stream loop when a call to its destroy function is made.
+ */
+void vidtv_psi_eit_event_assign(struct vidtv_psi_table_eit *eit,
+ struct vidtv_psi_table_eit_event *e);
+
+struct vidtv_psi_table_eit_event
+*vidtv_psi_eit_event_init(struct vidtv_psi_table_eit_event *head, u16 event_id);
+
+void vidtv_psi_eit_event_destroy(struct vidtv_psi_table_eit_event *e);
+
#endif // VIDTV_PSI_H
projects / users / jedix / linux-maple.git / commitdiff