// SPDX-License-Identifier: GPL-2.0
#include "dvb_filter.h"
#include "av7110_ipack.h"
#include <linux/string.h> /* for memcpy() */
#include <linux/vmalloc.h>
void av7110_ipack_reset(struct ipack *p)
{
p->found = 0;
p->cid = 0;
p->plength = 0;
p->flag1 = 0;
p->flag2 = 0;
p->hlength = 0;
p->mpeg = 0;
p->check = 0;
p->which = 0;
p->done = 0;
p->count = 0;
}
int av7110_ipack_init(struct ipack *p, int size,
void (*func)(u8 *buf, int size, void *priv))
{
p->buf = vmalloc(size);
if (!p->buf)
return -ENOMEM;
p->size = size;
p->func = func;
p->repack_subids = 0;
av7110_ipack_reset(p);
return 0;
}
void av7110_ipack_free(struct ipack *p)
{
vfree(p->buf);
}
static void send_ipack(struct ipack *p)
{
int off;
struct dvb_audio_info ai;
int ac3_off = 0;
int streamid = 0;
int nframes = 0;
int f = 0;
switch (p->mpeg) {
case 2:
if (p->count < 10)
return;
p->buf[3] = p->cid;
p->buf[4] = (u8)(((p->count - 6) & 0xff00) >> 8);
p->buf[5] = (u8)((p->count - 6) & 0x00ff);
if (p->repack_subids && p->cid == PRIVATE_STREAM1) {
off = 9 + p->buf[8];
streamid = p->buf[off];
if ((streamid & 0xf8) == 0x80) {
ai.off = 0;
ac3_off = ((p->buf[off + 2] << 8) |
p->buf[off + 3]);
if (ac3_off < p->count)
f = dvb_filter_get_ac3info(p->buf + off + 3 + ac3_off,
p->count - ac3_off, &ai, 0);
if (!f) {
nframes = (p->count - off - 3 - ac3_off) /
ai.framesize + 1;
p->buf[off + 2] = (ac3_off >> 8) & 0xff;
p->buf[off + 3] = (ac3_off) & 0xff;
p->buf[off + 1] = nframes;
ac3_off += nframes * ai.framesize - p->count;
}
}
}
p->func(p->buf, p->count, p->data);
p->buf[6] = 0x80;
p->buf[7] = 0x00;
p->buf[8] = 0x00;
p->count = 9;
if (p->repack_subids && p->cid == PRIVATE_STREAM1 &&
(streamid & 0xf8) == 0x80) {
p->count += 4;
p->buf[9] = streamid;
p->buf[10] = (ac3_off >> 8) & 0xff;
p->buf[11] = (ac3_off) & 0xff;
p->buf[12] = 0;
}
break;
case 1:
if (p->count < 8)
return;
p->buf[3] = p->cid;
p->buf[4] = (u8)(((p->count - 6) & 0xff00) >> 8);
p->buf[5] = (u8)((p->count - 6) & 0x00ff);
p->func(p->buf, p->count, p->data);
p->buf[6] = 0x0f;
p->count = 7;
break;
}
}
void av7110_ipack_flush(struct ipack *p)
{
if (p->plength != MMAX_PLENGTH - 6 || p->found <= 6)
return;
p->plength = p->found - 6;
p->found = 0;
send_ipack(p);
av7110_ipack_reset(p);
}
static void write_ipack(struct ipack *p, const u8 *data, int count)
{
u8 headr[3] = { 0x00, 0x00, 0x01 };
if (p->count < 6) {
memcpy(p->buf, headr, 3);
p->count = 6;
}
if (p->count + count < p->size) {
memcpy(p->buf + p->count, data, count);
p->count += count;
} else {
int rest = p->size - p->count;
memcpy(p->buf + p->count, data, rest);
p->count += rest;
send_ipack(p);
if (count - rest > 0)
write_ipack(p, data + rest, count - rest);
}
}
int av7110_ipack_instant_repack(const u8 *buf, int count, struct ipack *p)
{
int l;
int c = 0;
while (c < count && (p->mpeg == 0 ||
(p->mpeg == 1 && p->found < 7) ||
(p->mpeg == 2 && p->found < 9)) &&
(p->found < 5 || !p->done)) {
switch (p->found) {
case 0:
case 1:
if (buf[c] == 0x00)
p->found++;
else
p->found = 0;
c++;
break;
case 2:
if (buf[c] == 0x01)
p->found++;
else if (buf[c] == 0)
p->found = 2;
else
p->found = 0;
c++;
break;
case 3:
p->cid = 0;
switch (buf[c]) {
case PROG_STREAM_MAP:
case PRIVATE_STREAM2:
case PROG_STREAM_DIR:
case ECM_STREAM:
case EMM_STREAM:
case PADDING_STREAM:
case DSM_CC_STREAM:
case ISO13522_STREAM:
p->done = 1;
fallthrough;
case PRIVATE_STREAM1:
case VIDEO_STREAM_S ... VIDEO_STREAM_E:
case AUDIO_STREAM_S ... AUDIO_STREAM_E:
p->found++;
p->cid = buf[c];
c++;
break;
default:
p->found = 0;
break;
}
break;
case 4:
if (count - c > 1) {
p->plen[0] = buf[c];
c++;
p->plen[1] = buf[c];
c++;
p->found += 2;
p->plength = (p->plen[0] << 8) | p->plen[1];
} else {
p->plen[0] = buf[c];
p->found++;
return count;
}
break;
case 5:
p->plen[1] = buf[c];
c++;
p->found++;
p->plength = (p->plen[0] << 8) | p->plen[1];
break;
case 6:
if (!p->done) {
p->flag1 = buf[c];
c++;
p->found++;
if ((p->flag1 & 0xc0) == 0x80) {
p->mpeg = 2;
} else {
p->hlength = 0;
p->which = 0;
p->mpeg = 1;
p->flag2 = 0;
}
}
break;
case 7:
if (!p->done && p->mpeg == 2) {
p->flag2 = buf[c];
c++;
p->found++;
}
break;
case 8:
if (!p->done && p->mpeg == 2) {
p->hlength = buf[c];
c++;
p->found++;
}
break;
}
}
if (c == count)
return count;
if (!p->plength)
p->plength = MMAX_PLENGTH - 6;
if (!(p->done || ((p->mpeg == 2 && p->found >= 9) ||
(p->mpeg == 1 && p->found >= 7))))
return count;
switch (p->cid) {
case AUDIO_STREAM_S ... AUDIO_STREAM_E:
case VIDEO_STREAM_S ... VIDEO_STREAM_E:
case PRIVATE_STREAM1:
if (p->mpeg == 2 && p->found == 9) {
write_ipack(p, &p->flag1, 1);
write_ipack(p, &p->flag2, 1);
write_ipack(p, &p->hlength, 1);
}
if (p->mpeg == 1 && p->found == 7)
write_ipack(p, &p->flag1, 1);
if (p->mpeg == 2 && (p->flag2 & PTS_ONLY) && p->found < 14) {
while (c < count && p->found < 14) {
p->pts[p->found - 9] = buf[c];
write_ipack(p, buf + c, 1);
c++;
p->found++;
}
if (c == count)
return count;
}
if (p->mpeg == 1 && p->which < 2000) {
if (p->found == 7) {
p->check = p->flag1;
p->hlength = 1;
}
while (!p->which && c < count && p->check == 0xff) {
p->check = buf[c];
write_ipack(p, buf + c, 1);
c++;
p->found++;
p->hlength++;
}
if (c == count)
return count;
if ((p->check & 0xc0) == 0x40 && !p->which) {
p->check = buf[c];
write_ipack(p, buf + c, 1);
c++;
p->found++;
p->hlength++;
p->which = 1;
if (c == count)
return count;
p->check = buf[c];
write_ipack(p, buf + c, 1);
c++;
p->found++;
p->hlength++;
p->which = 2;
if (c == count)
return count;
}
if (p->which == 1) {
p->check = buf[c];
write_ipack(p, buf + c, 1);
c++;
p->found++;
p->hlength++;
p->which = 2;
if (c == count)
return count;
}
if ((p->check & 0x30) && p->check != 0xff) {
p->flag2 = (p->check & 0xf0) << 2;
p->pts[0] = p->check;
p->which = 3;
}
if (c == count)
return count;
if (p->which > 2) {
if ((p->flag2 & PTS_DTS_FLAGS) == PTS_ONLY) {
while (c < count && p->which < 7) {
p->pts[p->which - 2] = buf[c];
write_ipack(p, buf + c, 1);
c++;
p->found++;
p->which++;
p->hlength++;
}
if (c == count)
return count;
} else if ((p->flag2 & PTS_DTS_FLAGS) == PTS_DTS) {
while (c < count && p->which < 12) {
if (p->which < 7)
p->pts[p->which - 2] = buf[c];
write_ipack(p, buf + c, 1);
c++;
p->found++;
p->which++;
p->hlength++;
}
if (c == count)
return count;
}
p->which = 2000;
}
}
while (c < count && p->found < p->plength + 6) {
l = count - c;
if (l + p->found > p->plength + 6)
l = p->plength + 6 - p->found;
write_ipack(p, buf + c, l);
p->found += l;
c += l;
}
break;
}
if (p->done) {
if (p->found + count - c < p->plength + 6) {
p->found += count - c;
c = count;
} else {
c += p->plength + 6 - p->found;
p->found = p->plength + 6;
}
}
if (p->plength && p->found == p->plength + 6) {
send_ipack(p);
av7110_ipack_reset(p);
if (c < count)
av7110_ipack_instant_repack(buf + c, count - c, p);
}
return count;
}
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