diff options
| author | Mans Rullgard <mans@mansr.com> | 2011-11-27 14:04:16 +0000 |
|---|---|---|
| committer | Mans Rullgard <mans@mansr.com> | 2011-12-11 18:47:19 +0000 |
| commit | 3383a53e7d0abb9639c3ea3481f0eda9dca61a26 (patch) | |
| tree | d53f0c38d95d4256b727dc4f4c5add488aabe501 /libavformat/aiffdec.c | |
| parent | 5b3265a7181889b53ff8217c1bdccdf966c86955 (diff) | |
| download | ffmpeg-3383a53e7d0abb9639c3ea3481f0eda9dca61a26.tar.gz | |
lavu: replace int/float punning functions
The existing functions defined in intfloat_readwrite.[ch] are
both slow and incorrect (infinities are not handled).
This introduces a new header with fast, inline conversion
functions using direct union punning assuming an IEEE-754
system, an assumption already made throughout the code.
The one use of Intel/Motorola extended 80-bit format is
replaced by simpler code sufficient under the present
constraints (positive normal values).
The old functions are marked deprecated and retained for
compatibility.
Signed-off-by: Mans Rullgard <mans@mansr.com>
Diffstat (limited to 'libavformat/aiffdec.c')
| -rw-r--r-- | libavformat/aiffdec.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/libavformat/aiffdec.c b/libavformat/aiffdec.c index f54a7ffafe..0e69d02c8c 100644 --- a/libavformat/aiffdec.c +++ b/libavformat/aiffdec.c @@ -19,7 +19,7 @@ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ -#include "libavutil/intfloat_readwrite.h" +#include "libavutil/mathematics.h" #include "libavutil/dict.h" #include "avformat.h" #include "internal.h" @@ -88,7 +88,8 @@ static void get_meta(AVFormatContext *s, const char *key, int size) static unsigned int get_aiff_header(AVIOContext *pb, AVCodecContext *codec, int size, unsigned version) { - AVExtFloat ext; + int exp; + uint64_t val; double sample_rate; unsigned int num_frames; @@ -99,8 +100,9 @@ static unsigned int get_aiff_header(AVIOContext *pb, AVCodecContext *codec, num_frames = avio_rb32(pb); codec->bits_per_coded_sample = avio_rb16(pb); - avio_read(pb, (uint8_t*)&ext, sizeof(ext));/* Sample rate is in */ - sample_rate = av_ext2dbl(ext); /* 80 bits BE IEEE extended float */ + exp = avio_rb16(pb); + val = avio_rb64(pb); + sample_rate = ldexp(val, exp - 16383 - 63); codec->sample_rate = sample_rate; size -= 18; |