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