diff options
Diffstat (limited to 'src/lib/ffmpeg/avcodec.pas')
| -rw-r--r-- | src/lib/ffmpeg/avcodec.pas | 20 |
1 files changed, 14 insertions, 6 deletions
diff --git a/src/lib/ffmpeg/avcodec.pas b/src/lib/ffmpeg/avcodec.pas index 175ed053..2c98f8fa 100644 --- a/src/lib/ffmpeg/avcodec.pas +++ b/src/lib/ffmpeg/avcodec.pas @@ -4693,13 +4693,21 @@ const {$ENDIF} {$ENDIF} +(** + * We need the sign of of the error, because some platforms have + * E* and errno already negated. The previous version failed + * with Delphi, because it needs EINVAL defined. + * Warning: This code is platform dependent and assumes constants + * to be 32 bit. + * This version does the following steps: + * 1) shr 6: shifts the sign bit to bit position 2 + * 2) and $00000002: sets all other bits to zero + * positive EINVAL gives 0, negative gives 2 + * 3) not: inverts all bits. This gives -1 and -3 + * 4) + 2: positive EINVAL gives 1, negative -1 + *) const -{$IF EINVAL > 0} - AVERROR_SIGN = -1; -{$ELSE} - {* Some platforms have E* and errno already negated. *} - AVERROR_SIGN = 1; -{$IFEND} + AVERROR_SIGN = not((EINVAL shr 6) and $00000002) + 2; (* #if EINVAL > 0 |