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path: root/drivers/media/dvb/ttpci/av7110_ipack.c
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Diffstat (limited to 'drivers/media/dvb/ttpci/av7110_ipack.c')
-rw-r--r--drivers/media/dvb/ttpci/av7110_ipack.c403
1 files changed, 403 insertions, 0 deletions
diff --git a/drivers/media/dvb/ttpci/av7110_ipack.c b/drivers/media/dvb/ttpci/av7110_ipack.c
new file mode 100644
index 000000000000..246640741888
--- /dev/null
+++ b/drivers/media/dvb/ttpci/av7110_ipack.c
@@ -0,0 +1,403 @@
+#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))
+{
+ if (!(p->buf = vmalloc(size*sizeof(u8)))) {
+ printk ("Couldn't allocate memory for ipack\n");
+ 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;
+ /* fall through */
+ 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))) {
+ 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;
+}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.