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| author | Diego Biurrun <diego@biurrun.de> | 2013-05-15 15:17:08 +0200 |
|---|---|---|
| committer | Diego Biurrun <diego@biurrun.de> | 2013-05-15 23:53:42 +0200 |
| commit | 004b81c465d5bad63e72cdaa923429696e899caa (patch) | |
| tree | ebe2a61d522cf81e16f5a82fb9c45165be043b15 /libavcodec/x86/mpegvideo.c | |
| parent | d46c588f3cb1963a00e990ceaf4ba9ffa05a716d (diff) | |
| download | ffmpeg-streaming-004b81c465d5bad63e72cdaa923429696e899caa.zip ffmpeg-streaming-004b81c465d5bad63e72cdaa923429696e899caa.tar.gz | |
mpegvideo: Remove commented-out PARANOID debug cruft
Diffstat (limited to 'libavcodec/x86/mpegvideo.c')
| -rw-r--r-- | libavcodec/x86/mpegvideo.c | 30 |
1 files changed, 0 insertions, 30 deletions
diff --git a/libavcodec/x86/mpegvideo.c b/libavcodec/x86/mpegvideo.c index 55cff74..68f3b62 100644 --- a/libavcodec/x86/mpegvideo.c +++ b/libavcodec/x86/mpegvideo.c @@ -164,36 +164,6 @@ __asm__ volatile( ); } - -/* - NK: - Note: looking at PARANOID: - "enable all paranoid tests for rounding, overflows, etc..." - -#ifdef PARANOID - if (level < -2048 || level > 2047) - fprintf(stderr, "unquant error %d %d\n", i, level); -#endif - We can suppose that result of two multiplications can't be greater than 0xFFFF - i.e. is 16-bit, so we use here only PMULLW instruction and can avoid - a complex multiplication. -===================================================== - Full formula for multiplication of 2 integer numbers - which are represent as high:low words: - input: value1 = high1:low1 - value2 = high2:low2 - output: value3 = value1*value2 - value3=high3:low3 (on overflow: modulus 2^32 wrap-around) - this mean that for 0x123456 * 0x123456 correct result is 0x766cb0ce4 - but this algorithm will compute only 0x66cb0ce4 - this limited by 16-bit size of operands - --------------------------------- - tlow1 = high1*low2 - tlow2 = high2*low1 - tlow1 = tlow1 + tlow2 - high3:low3 = low1*low2 - high3 += tlow1 -*/ static void dct_unquantize_mpeg1_intra_mmx(MpegEncContext *s, int16_t *block, int n, int qscale) { |
