1 // SPDX-License-Identifier: GPL-2.0
3 * Vidtv serves as a reference DVB driver and helps validate the existing APIs
4 * in the media subsystem. It can also aid developers working on userspace
7 * This file contains the code for a 'channel' abstraction.
9 * When vidtv boots, it will create some hardcoded channels.
10 * Their services will be concatenated to populate the SDT.
11 * Their programs will be concatenated to populate the PAT
12 * Their events will be concatenated to populate the EIT
13 * For each program in the PAT, a PMT section will be created
14 * The PMT section for a channel will be assigned its streams.
15 * Every stream will have its corresponding encoder polled to produce TS packets
16 * These packets may be interleaved by the mux and then delivered to the bridge
19 * Copyright (C) 2020 Daniel W. S. Almeida
22 #include <linux/dev_printk.h>
23 #include <linux/ratelimit.h>
24 #include <linux/slab.h>
25 #include <linux/types.h>
27 #include "vidtv_channel.h"
28 #include "vidtv_common.h"
29 #include "vidtv_encoder.h"
30 #include "vidtv_mux.h"
31 #include "vidtv_psi.h"
32 #include "vidtv_s302m.h"
34 static void vidtv_channel_encoder_destroy(struct vidtv_encoder *e)
36 struct vidtv_encoder *tmp = NULL;
37 struct vidtv_encoder *curr = e;
40 /* forward the call to the derived type */
47 #define ENCODING_ISO8859_15 "\x0b"
48 #define TS_NIT_PID 0x10
51 * init an audio only channel with a s302m encoder
54 *vidtv_channel_s302m_init(struct vidtv_channel *head, u16 transport_stream_id)
56 const __be32 s302m_fid = cpu_to_be32(VIDTV_S302M_FORMAT_IDENTIFIER);
57 char *event_text = ENCODING_ISO8859_15 "Bagatelle No. 25 in A minor for solo piano, also known as F\xfcr Elise, composed by Ludwig van Beethoven";
58 char *event_name = ENCODING_ISO8859_15 "Ludwig van Beethoven: F\xfcr Elise";
59 struct vidtv_s302m_encoder_init_args encoder_args = {};
60 char *iso_language_code = ENCODING_ISO8859_15 "eng";
61 char *provider = ENCODING_ISO8859_15 "LinuxTV.org";
62 char *name = ENCODING_ISO8859_15 "Beethoven";
63 const u16 s302m_es_pid = 0x111; /* packet id for the ES */
64 const u16 s302m_program_pid = 0x101; /* packet id for PMT*/
65 const u16 s302m_service_id = 0x880;
66 const u16 s302m_program_num = 0x880;
67 const u16 s302m_beethoven_event_id = 1;
68 struct vidtv_channel *s302m;
70 s302m = kzalloc(sizeof(*s302m), GFP_KERNEL);
74 s302m->name = kstrdup(name, GFP_KERNEL);
78 s302m->service = vidtv_psi_sdt_service_init(NULL, s302m_service_id, false, true);
82 s302m->service->descriptor = (struct vidtv_psi_desc *)
83 vidtv_psi_service_desc_init(NULL,
84 DIGITAL_TELEVISION_SERVICE,
87 if (!s302m->service->descriptor)
90 s302m->transport_stream_id = transport_stream_id;
92 s302m->program = vidtv_psi_pat_program_init(NULL,
98 s302m->program_num = s302m_program_num;
100 s302m->streams = vidtv_psi_pmt_stream_init(NULL,
106 s302m->streams->descriptor = (struct vidtv_psi_desc *)
107 vidtv_psi_registration_desc_init(NULL,
111 if (!s302m->streams->descriptor)
114 encoder_args.es_pid = s302m_es_pid;
116 s302m->encoders = vidtv_s302m_encoder_init(encoder_args);
117 if (!s302m->encoders)
120 s302m->events = vidtv_psi_eit_event_init(NULL, s302m_beethoven_event_id);
123 s302m->events->descriptor = (struct vidtv_psi_desc *)
124 vidtv_psi_short_event_desc_init(NULL,
128 if (!s302m->events->descriptor)
141 vidtv_psi_eit_event_destroy(s302m->events);
143 vidtv_s302m_encoder_destroy(s302m->encoders);
145 vidtv_psi_pmt_stream_destroy(s302m->streams);
147 vidtv_psi_pat_program_destroy(s302m->program);
149 vidtv_psi_sdt_service_destroy(s302m->service);
158 static struct vidtv_psi_table_eit_event
159 *vidtv_channel_eit_event_cat_into_new(struct vidtv_mux *m)
161 /* Concatenate the events */
162 const struct vidtv_channel *cur_chnl = m->channels;
163 struct vidtv_psi_table_eit_event *curr = NULL;
164 struct vidtv_psi_table_eit_event *head = NULL;
165 struct vidtv_psi_table_eit_event *tail = NULL;
166 struct vidtv_psi_desc *desc = NULL;
173 curr = cur_chnl->events;
176 dev_warn_ratelimited(m->dev,
177 "No events found for channel %s\n",
181 event_id = be16_to_cpu(curr->event_id);
182 tail = vidtv_psi_eit_event_init(tail, event_id);
184 vidtv_psi_eit_event_destroy(head);
188 desc = vidtv_psi_desc_clone(curr->descriptor);
189 vidtv_psi_desc_assign(&tail->descriptor, desc);
197 cur_chnl = cur_chnl->next;
203 static struct vidtv_psi_table_sdt_service
204 *vidtv_channel_sdt_serv_cat_into_new(struct vidtv_mux *m)
206 /* Concatenate the services */
207 const struct vidtv_channel *cur_chnl = m->channels;
209 struct vidtv_psi_table_sdt_service *curr = NULL;
210 struct vidtv_psi_table_sdt_service *head = NULL;
211 struct vidtv_psi_table_sdt_service *tail = NULL;
213 struct vidtv_psi_desc *desc = NULL;
220 curr = cur_chnl->service;
223 dev_warn_ratelimited(m->dev,
224 "No services found for channel %s\n",
228 service_id = be16_to_cpu(curr->service_id);
229 tail = vidtv_psi_sdt_service_init(tail,
232 curr->EIT_present_following);
236 desc = vidtv_psi_desc_clone(curr->descriptor);
239 vidtv_psi_desc_assign(&tail->descriptor, desc);
247 cur_chnl = cur_chnl->next;
253 vidtv_psi_sdt_service_destroy(tail);
255 vidtv_psi_sdt_service_destroy(head);
259 static struct vidtv_psi_table_pat_program*
260 vidtv_channel_pat_prog_cat_into_new(struct vidtv_mux *m)
262 /* Concatenate the programs */
263 const struct vidtv_channel *cur_chnl = m->channels;
264 struct vidtv_psi_table_pat_program *curr = NULL;
265 struct vidtv_psi_table_pat_program *head = NULL;
266 struct vidtv_psi_table_pat_program *tail = NULL;
274 curr = cur_chnl->program;
277 dev_warn_ratelimited(m->dev,
278 "No programs found for channel %s\n",
282 serv_id = be16_to_cpu(curr->service_id);
283 pid = vidtv_psi_get_pat_program_pid(curr);
284 tail = vidtv_psi_pat_program_init(tail,
288 vidtv_psi_pat_program_destroy(head);
298 cur_chnl = cur_chnl->next;
300 /* Add the NIT table */
301 vidtv_psi_pat_program_init(tail, 0, TS_NIT_PID);
307 * Match channels to their respective PMT sections, then assign the
311 vidtv_channel_pmt_match_sections(struct vidtv_channel *channels,
312 struct vidtv_psi_table_pmt **sections,
315 struct vidtv_psi_table_pmt *curr_section = NULL;
316 struct vidtv_psi_table_pmt_stream *head = NULL;
317 struct vidtv_psi_table_pmt_stream *tail = NULL;
318 struct vidtv_psi_table_pmt_stream *s = NULL;
319 struct vidtv_channel *cur_chnl = channels;
320 struct vidtv_psi_desc *desc = NULL;
321 u16 e_pid; /* elementary stream pid */
326 for (j = 0; j < nsections; ++j) {
327 curr_section = sections[j];
332 curr_id = be16_to_cpu(curr_section->header.id);
335 if (curr_id == cur_chnl->program_num) {
336 s = cur_chnl->streams;
338 /* clone the streams for the PMT */
340 e_pid = vidtv_psi_pmt_stream_get_elem_pid(s);
341 tail = vidtv_psi_pmt_stream_init(tail,
348 desc = vidtv_psi_desc_clone(s->descriptor);
349 vidtv_psi_desc_assign(&tail->descriptor,
355 vidtv_psi_pmt_stream_assign(curr_section, head);
360 cur_chnl = cur_chnl->next;
365 vidtv_channel_destroy_service_list(struct vidtv_psi_desc_service_list_entry *e)
367 struct vidtv_psi_desc_service_list_entry *tmp;
376 static struct vidtv_psi_desc_service_list_entry
377 *vidtv_channel_build_service_list(struct vidtv_psi_table_sdt_service *s)
379 struct vidtv_psi_desc_service_list_entry *curr_e = NULL;
380 struct vidtv_psi_desc_service_list_entry *head_e = NULL;
381 struct vidtv_psi_desc_service_list_entry *prev_e = NULL;
382 struct vidtv_psi_desc *desc = s->descriptor;
383 struct vidtv_psi_desc_service *s_desc;
387 if (s->descriptor->type != SERVICE_DESCRIPTOR)
390 s_desc = (struct vidtv_psi_desc_service *)desc;
392 curr_e = kzalloc(sizeof(*curr_e), GFP_KERNEL);
394 vidtv_channel_destroy_service_list(head_e);
398 curr_e->service_id = s->service_id;
399 curr_e->service_type = s_desc->service_type;
404 prev_e->next = curr_e;
416 int vidtv_channel_si_init(struct vidtv_mux *m)
418 struct vidtv_psi_desc_service_list_entry *service_list = NULL;
419 struct vidtv_psi_table_pat_program *programs = NULL;
420 struct vidtv_psi_table_sdt_service *services = NULL;
421 struct vidtv_psi_table_eit_event *events = NULL;
423 m->si.pat = vidtv_psi_pat_table_init(m->transport_stream_id);
427 m->si.sdt = vidtv_psi_sdt_table_init(m->transport_stream_id);
431 programs = vidtv_channel_pat_prog_cat_into_new(m);
434 services = vidtv_channel_sdt_serv_cat_into_new(m);
438 events = vidtv_channel_eit_event_cat_into_new(m);
442 /* look for a service descriptor for every service */
443 service_list = vidtv_channel_build_service_list(services);
447 /* use these descriptors to build the NIT */
448 m->si.nit = vidtv_psi_nit_table_init(m->network_id,
449 m->transport_stream_id,
453 goto free_service_list;
455 m->si.eit = vidtv_psi_eit_table_init(m->network_id,
456 m->transport_stream_id,
457 programs->service_id);
461 /* assemble all programs and assign to PAT */
462 vidtv_psi_pat_program_assign(m->si.pat, programs);
464 /* assemble all services and assign to SDT */
465 vidtv_psi_sdt_service_assign(m->si.sdt, services);
467 /* assemble all events and assign to EIT */
468 vidtv_psi_eit_event_assign(m->si.eit, events);
470 m->si.pmt_secs = vidtv_psi_pmt_create_sec_for_each_pat_entry(m->si.pat,
475 vidtv_channel_pmt_match_sections(m->channels,
479 vidtv_channel_destroy_service_list(service_list);
484 vidtv_psi_eit_table_destroy(m->si.eit);
486 vidtv_psi_nit_table_destroy(m->si.nit);
488 vidtv_channel_destroy_service_list(service_list);
490 vidtv_psi_eit_event_destroy(events);
492 vidtv_psi_sdt_service_destroy(services);
494 vidtv_psi_pat_program_destroy(programs);
496 vidtv_psi_sdt_table_destroy(m->si.sdt);
498 vidtv_psi_pat_table_destroy(m->si.pat);
502 void vidtv_channel_si_destroy(struct vidtv_mux *m)
506 vidtv_psi_pat_table_destroy(m->si.pat);
508 for (i = 0; i < m->si.pat->num_pmt; ++i)
509 vidtv_psi_pmt_table_destroy(m->si.pmt_secs[i]);
511 kfree(m->si.pmt_secs);
512 vidtv_psi_sdt_table_destroy(m->si.sdt);
513 vidtv_psi_nit_table_destroy(m->si.nit);
514 vidtv_psi_eit_table_destroy(m->si.eit);
517 int vidtv_channels_init(struct vidtv_mux *m)
519 /* this is the place to add new 'channels' for vidtv */
520 m->channels = vidtv_channel_s302m_init(NULL, m->transport_stream_id);
528 void vidtv_channels_destroy(struct vidtv_mux *m)
530 struct vidtv_channel *curr = m->channels;
531 struct vidtv_channel *tmp = NULL;
535 vidtv_psi_sdt_service_destroy(curr->service);
536 vidtv_psi_pat_program_destroy(curr->program);
537 vidtv_psi_pmt_stream_destroy(curr->streams);
538 vidtv_channel_encoder_destroy(curr->encoders);
539 vidtv_psi_eit_event_destroy(curr->events);