diff options
author | Jan Gerber <j@v2v.cc> | 2013-11-15 22:00:37 +0400 |
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committer | Michael Niedermayer <michaelni@gmx.at> | 2013-11-16 00:38:12 +0400 |
commit | d03eea36b2c329241f63c8aca2d6adbb6ea81d9c (patch) | |
tree | 3c284e1187b4074b7a0d1d75c08b536b8767b5db /libavformat/matroskaenc.c | |
parent | 5592d1b741924d375a04470eda8e601715e0d04c (diff) |
lavf/matroska*: add support for signed integers
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Diffstat (limited to 'libavformat/matroskaenc.c')
-rw-r--r-- | libavformat/matroskaenc.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/libavformat/matroskaenc.c b/libavformat/matroskaenc.c index d8355b23cc..8db4795d8c 100644 --- a/libavformat/matroskaenc.c +++ b/libavformat/matroskaenc.c @@ -202,6 +202,27 @@ static void put_ebml_uint(AVIOContext *pb, unsigned int elementid, uint64_t val) avio_w8(pb, (uint8_t)(val >> i*8)); } +static void put_ebml_sint(AVIOContext *pb, unsigned int elementid, int64_t val) +{ + int i, bytes = 1; + uint64_t uval = (val < 0 ? (-val - 1) << 1 : val << 1); + while (uval>>=8) bytes++; + + /* make unsigned */ + if (val >= 0) { + uval = val; + } else { + uval = 0x80 << (bytes - 1); + uval += val; + uval |= 0x80 << (bytes - 1); + } + + put_ebml_id(pb, elementid); + put_ebml_num(pb, bytes, 0); + for (i = bytes - 1; i >= 0; i--) + avio_w8(pb, (uint8_t)(uval >> i*8)); +} + static void put_ebml_float(AVIOContext *pb, unsigned int elementid, double val) { put_ebml_id(pb, elementid); |