1 // SPDX-License-Identifier: GPL-2.0
2 #include "dvb_filter.h"
3 #include "av7110_ipack.h"
4 #include <linux/string.h> /* for memcpy() */
5 #include <linux/vmalloc.h>
6
7
8 void av7110_ipack_reset(struct ipack *p)
9 {
10 p->found = 0;
11 p->cid = 0;
12 p->plength = 0;
13 p->flag1 = 0;
14 p->flag2 = 0;
15 p->hlength = 0;
16 p->mpeg = 0;
17 p->check = 0;
18 p->which = 0;
19 p->done = 0;
20 p->count = 0;
21 }
22
23
24 int av7110_ipack_init(struct ipack *p, int size,
25 void (*func)(u8 *buf, int size, void *priv))
26 {
27 if (!(p->buf = vmalloc(size))) {
28 printk(KERN_WARNING "Couldn't allocate memory for ipack\n");
29 return -ENOMEM;
30 }
31 p->size = size;
32 p->func = func;
33 p->repack_subids = 0;
34 av7110_ipack_reset(p);
35 return 0;
36 }
37
38
39 void av7110_ipack_free(struct ipack *p)
40 {
41 vfree(p->buf);
42 }
43
44
45 static void send_ipack(struct ipack *p)
46 {
47 int off;
48 struct dvb_audio_info ai;
49 int ac3_off = 0;
50 int streamid = 0;
51 int nframes = 0;
52 int f = 0;
53
54 switch (p->mpeg) {
55 case 2:
56 if (p->count < 10)
57 return;
58 p->buf[3] = p->cid;
59 p->buf[4] = (u8)(((p->count - 6) & 0xff00) >> 8);
60 p->buf[5] = (u8)((p->count - 6) & 0x00ff);
61 if (p->repack_subids && p->cid == PRIVATE_STREAM1) {
62 off = 9 + p->buf[8];
63 streamid = p->buf[off];
64 if ((streamid & 0xf8) == 0x80) {
65 ai.off = 0;
66 ac3_off = ((p->buf[off + 2] << 8)|
67 p->buf[off + 3]);
68 if (ac3_off < p->count)
69 f = dvb_filter_get_ac3info(p->buf + off + 3 + ac3_off,
70 p->count - ac3_off, &ai, 0);
71 if (!f) {
72 nframes = (p->count - off - 3 - ac3_off) /
73 ai.framesize + 1;
74 p->buf[off + 2] = (ac3_off >> 8) & 0xff;
75 p->buf[off + 3] = (ac3_off) & 0xff;
76 p->buf[off + 1] = nframes;
77 ac3_off += nframes * ai.framesize - p->count;
78 }
79 }
80 }
81 p->func(p->buf, p->count, p->data);
82
83 p->buf[6] = 0x80;
84 p->buf[7] = 0x00;
85 p->buf[8] = 0x00;
86 p->count = 9;
87 if (p->repack_subids && p->cid == PRIVATE_STREAM1
88 && (streamid & 0xf8) == 0x80) {
89 p->count += 4;
90 p->buf[9] = streamid;
91 p->buf[10] = (ac3_off >> 8) & 0xff;
92 p->buf[11] = (ac3_off) & 0xff;
93 p->buf[12] = 0;
94 }
95 break;
96
97 case 1:
98 if (p->count < 8)
99 return;
100 p->buf[3] = p->cid;
101 p->buf[4] = (u8)(((p->count - 6) & 0xff00) >> 8);
102 p->buf[5] = (u8)((p->count - 6) & 0x00ff);
103 p->func(p->buf, p->count, p->data);
104
105 p->buf[6] = 0x0f;
106 p->count = 7;
107 break;
108 }
109 }
110
111
112 void av7110_ipack_flush(struct ipack *p)
113 {
114 if (p->plength != MMAX_PLENGTH - 6 || p->found <= 6)
115 return;
116 p->plength = p->found - 6;
117 p->found = 0;
118 send_ipack(p);
119 av7110_ipack_reset(p);
120 }
121
122
123 static void write_ipack(struct ipack *p, const u8 *data, int count)
124 {
125 u8 headr[3] = { 0x00, 0x00, 0x01 };
126
127 if (p->count < 6) {
128 memcpy(p->buf, headr, 3);
129 p->count = 6;
130 }
131
132 if (p->count + count < p->size){
133 memcpy(p->buf+p->count, data, count);
134 p->count += count;
135 } else {
136 int rest = p->size - p->count;
137 memcpy(p->buf+p->count, data, rest);
138 p->count += rest;
139 send_ipack(p);
140 if (count - rest > 0)
141 write_ipack(p, data + rest, count - rest);
142 }
143 }
144
145
146 int av7110_ipack_instant_repack (const u8 *buf, int count, struct ipack *p)
147 {
148 int l;
149 int c = 0;
150
151 while (c < count && (p->mpeg == 0 ||
152 (p->mpeg == 1 && p->found < 7) ||
153 (p->mpeg == 2 && p->found < 9))
154 && (p->found < 5 || !p->done)) {
155 switch (p->found) {
156 case 0:
157 case 1:
158 if (buf[c] == 0x00)
159 p->found++;
160 else
161 p->found = 0;
162 c++;
163 break;
164 case 2:
165 if (buf[c] == 0x01)
166 p->found++;
167 else if (buf[c] == 0)
168 p->found = 2;
169 else
170 p->found = 0;
171 c++;
172 break;
173 case 3:
174 p->cid = 0;
175 switch (buf[c]) {
176 case PROG_STREAM_MAP:
177 case PRIVATE_STREAM2:
178 case PROG_STREAM_DIR:
179 case ECM_STREAM :
180 case EMM_STREAM :
181 case PADDING_STREAM :
182 case DSM_CC_STREAM :
183 case ISO13522_STREAM:
184 p->done = 1;
185 /* fall through */
186 case PRIVATE_STREAM1:
187 case VIDEO_STREAM_S ... VIDEO_STREAM_E:
188 case AUDIO_STREAM_S ... AUDIO_STREAM_E:
189 p->found++;
190 p->cid = buf[c];
191 c++;
192 break;
193 default:
194 p->found = 0;
195 break;
196 }
197 break;
198
199 case 4:
200 if (count-c > 1) {
201 p->plen[0] = buf[c];
202 c++;
203 p->plen[1] = buf[c];
204 c++;
205 p->found += 2;
206 p->plength = (p->plen[0] << 8) | p->plen[1];
207 } else {
208 p->plen[0] = buf[c];
209 p->found++;
210 return count;
211 }
212 break;
213 case 5:
214 p->plen[1] = buf[c];
215 c++;
216 p->found++;
217 p->plength = (p->plen[0] << 8) | p->plen[1];
218 break;
219 case 6:
220 if (!p->done) {
221 p->flag1 = buf[c];
222 c++;
223 p->found++;
224 if ((p->flag1 & 0xc0) == 0x80)
225 p->mpeg = 2;
226 else {
227 p->hlength = 0;
228 p->which = 0;
229 p->mpeg = 1;
230 p->flag2 = 0;
231 }
232 }
233 break;
234
235 case 7:
236 if (!p->done && p->mpeg == 2) {
237 p->flag2 = buf[c];
238 c++;
239 p->found++;
240 }
241 break;
242
243 case 8:
244 if (!p->done && p->mpeg == 2) {
245 p->hlength = buf[c];
246 c++;
247 p->found++;
248 }
249 break;
250 }
251 }
252
253 if (c == count)
254 return count;
255
256 if (!p->plength)
257 p->plength = MMAX_PLENGTH - 6;
258
259 if (p->done || ((p->mpeg == 2 && p->found >= 9) ||
260 (p->mpeg == 1 && p->found >= 7))) {
261 switch (p->cid) {
262 case AUDIO_STREAM_S ... AUDIO_STREAM_E:
263 case VIDEO_STREAM_S ... VIDEO_STREAM_E:
264 case PRIVATE_STREAM1:
265 if (p->mpeg == 2 && p->found == 9) {
266 write_ipack(p, &p->flag1, 1);
267 write_ipack(p, &p->flag2, 1);
268 write_ipack(p, &p->hlength, 1);
269 }
270
271 if (p->mpeg == 1 && p->found == 7)
272 write_ipack(p, &p->flag1, 1);
273
274 if (p->mpeg == 2 && (p->flag2 & PTS_ONLY) &&
275 p->found < 14) {
276 while (c < count && p->found < 14) {
277 p->pts[p->found - 9] = buf[c];
278 write_ipack(p, buf + c, 1);
279 c++;
280 p->found++;
281 }
282 if (c == count)
283 return count;
284 }
285
286 if (p->mpeg == 1 && p->which < 2000) {
287
288 if (p->found == 7) {
289 p->check = p->flag1;
290 p->hlength = 1;
291 }
292
293 while (!p->which && c < count &&
294 p->check == 0xff){
295 p->check = buf[c];
296 write_ipack(p, buf + c, 1);
297 c++;
298 p->found++;
299 p->hlength++;
300 }
301
302 if (c == count)
303 return count;
304
305 if ((p->check & 0xc0) == 0x40 && !p->which) {
306 p->check = buf[c];
307 write_ipack(p, buf + c, 1);
308 c++;
309 p->found++;
310 p->hlength++;
311
312 p->which = 1;
313 if (c == count)
314 return count;
315 p->check = buf[c];
316 write_ipack(p, buf + c, 1);
317 c++;
318 p->found++;
319 p->hlength++;
320 p->which = 2;
321 if (c == count)
322 return count;
323 }
324
325 if (p->which == 1) {
326 p->check = buf[c];
327 write_ipack(p, buf + c, 1);
328 c++;
329 p->found++;
330 p->hlength++;
331 p->which = 2;
332 if (c == count)
333 return count;
334 }
335
336 if ((p->check & 0x30) && p->check != 0xff) {
337 p->flag2 = (p->check & 0xf0) << 2;
338 p->pts[0] = p->check;
339 p->which = 3;
340 }
341
342 if (c == count)
343 return count;
344 if (p->which > 2){
345 if ((p->flag2 & PTS_DTS_FLAGS) == PTS_ONLY) {
346 while (c < count && p->which < 7) {
347 p->pts[p->which - 2] = buf[c];
348 write_ipack(p, buf + c, 1);
349 c++;
350 p->found++;
351 p->which++;
352 p->hlength++;
353 }
354 if (c == count)
355 return count;
356 } else if ((p->flag2 & PTS_DTS_FLAGS) == PTS_DTS) {
357 while (c < count && p->which < 12) {
358 if (p->which < 7)
359 p->pts[p->which - 2] = buf[c];
360 write_ipack(p, buf + c, 1);
361 c++;
362 p->found++;
363 p->which++;
364 p->hlength++;
365 }
366 if (c == count)
367 return count;
368 }
369 p->which = 2000;
370 }
371
372 }
373
374 while (c < count && p->found < p->plength + 6) {
375 l = count - c;
376 if (l + p->found > p->plength + 6)
377 l = p->plength + 6 - p->found;
378 write_ipack(p, buf + c, l);
379 p->found += l;
380 c += l;
381 }
382 break;
383 }
384
385
386 if (p->done) {
387 if (p->found + count - c < p->plength + 6) {
388 p->found += count - c;
389 c = count;
390 } else {
391 c += p->plength + 6 - p->found;
392 p->found = p->plength + 6;
393 }
394 }
395
396 if (p->plength && p->found == p->plength + 6) {
397 send_ipack(p);
398 av7110_ipack_reset(p);
399 if (c < count)
400 av7110_ipack_instant_repack(buf + c, count - c, p);
401 }
402 }
403 return count;
404 }