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More non-functional code for extracting the PAR from MPEG 4 layer 10 streams.

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This commit is contained in:
Moritz Bunkus 2004-12-28 10:02:36 +00:00
parent 2fee42f4d0
commit 78cd9491bc
1 changed files with 95 additions and 6 deletions
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101
src/common/mpeg4_common.cpp
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@ -258,17 +258,106 @@ decode_nal(const uint8_t *src,
return dst;
}
static const uint8_t golomb_vlc_len[512] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1
};
static int
ilog2(uint32_t value) {
int n;
n = 0;
if (value & 0xffff0000) {
value >>= 16;
n += 16;
}
if (value & 0xff00) {
value >>= 8;
n += 8;
}
if (value >= 0x80)
return n + 7;
else if (value >= 0x40)
return n + 6;
else if (value >= 0x20)
return n + 5;
else if (value >= 0x10)
return n + 4;
else if (value >= 0x08)
return n + 3;
else if (value >= 0x04)
return n + 2;
else if (value >= 0x02)
return n + 1;
return n;
}
static bool
skip_golomb_ue(bit_cursor_c &bits) {
uint32_t buf;
bool ok;
ok = bits.get_bits(32, buf);
if (buf >= (1 << 27)) {
buf >>= 23;
ok &= bits.skip_bits(golomb_vlc_len[buf]);
} else {
int log;
log = 2 * ilog2(buf) - 31;
ok &= bits.skip_bits(32 - log);
}
return ok;
}
static bool
decode_seq_parameter_set(bit_cursor_c &bits,
uint32_t &par_num,
uint32_t &par_den) {
// bool ok;
bool ok;
ok = true;
ok &= bits.skip_bits(8); // profile_idc
ok &= bits.skip_bits(4); // constraint_setX_flag
ok &= bits.skip_bits(4); // reserved
ok &= bits.skip_bits(8); // level_idc
ok &= skip_golomb_ue(bits); // sps_id
ok &= skip_golomb_ue(bits); // sps: log2_max_frame_num
ok &= skip_golomb_ue(bits); // sps: poc_type
// ok = true;
// ok &= bits.skip_bits(8); // profile_idc
// ok &= bits.skip_bits(4); // constraint_setX_flag
// ok &= bits.skip_bits(4); // reserved
// ok &= bits.skip_bits(
return false;
}