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bitstream: add get_bits64() to support reading more than 32 bits at once 

Also remove a duplicate function in the MPEG-TS demuxer.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Signed-off-by: Justin Ruggles <justin.ruggles@gmail.com>
This commit is contained in:
Michael Niedermayer 2012-09-30 02:39:55 +02:00 committed by Justin Ruggles
parent b57c1da81e
commit 41540b36a1
2 changed files with 18 additions and 13 deletions
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18
libavcodec/get_bits.h
View File

@ -313,6 +313,24 @@ static inline unsigned int get_bits_long(GetBitContext *s, int n)
}
}
/*
* Read 0-64 bits.
*/
static inline uint64_t get_bits64(GetBitContext *s, int n)
{
if (n <= 32) {
return get_bits_long(s, n);
} else {
#ifdef BITSTREAM_READER_LE
uint64_t ret = get_bits_long(s, 32);
return ret | (uint64_t)get_bits_long(s, n - 32) << 32;
#else
uint64_t ret = (uint64_t)get_bits_long(s, n - 32) << 32;
return ret | get_bits_long(s, 32);
#endif
}
}
/**
* Read 0-32 bits as a signed integer.
*/

13
libavformat/mpegts.c
View File

@ -665,19 +665,6 @@ static void new_pes_packet(PESContext *pes, AVPacket *pkt)
pes->flags = 0;
}
static uint64_t get_bits64(GetBitContext *gb, int bits)
{
uint64_t ret = 0;
while (bits > 17) {
ret <<= 17;
ret |= get_bits(gb, 17);
bits -= 17;
}
ret <<= bits;
ret |= get_bits(gb, bits);
return ret;
}
static int read_sl_header(PESContext *pes, SLConfigDescr *sl, const uint8_t *buf, int buf_size)
{
GetBitContext gb;