[FFmpeg-devel] [PATCH 1/2] Add some dsputil functions useful for AAC decoder

[Måns Rullgård]

Alex Converse <alex.converse at gmail.com> writes:

> On Mon, Sep 21, 2009 at 4:40 PM, Mans Rullgard <mans at mansr.com> wrote:
>>
>> ---
>> ?libavcodec/dsputil.c | ? 83 ++++++++++++++++++++++++++++++++++++++++++++++++++
>> ?libavcodec/dsputil.h | ? 50 ++++++++++++++++++++++++++++++
>> ?2 files changed, 133 insertions(+), 0 deletions(-)
>>
>> diff --git a/libavcodec/dsputil.c b/libavcodec/dsputil.c
>> index 773d47f..f32ba50 100644
>> --- a/libavcodec/dsputil.c
>> +++ b/libavcodec/dsputil.c
> [...]
>> +static void butterflies_float_c(float *v1, float *v2, int len)
>> +{
>> + ? ?int i;
>> + ? ?for (i = 0; i < len; i++) {
>> + ? ? ? ?float t = v1[i] - v2[i];
>> + ? ? ? ?v1[i] += v2[i];
>> + ? ? ? ?v2[i] = t;
>> + ? ?}
>> +}
> [...]
>> + ? ?/**
>> + ? ? * Calculate the sum and difference of two vectors of floats.
>> + ? ? * @param v1 ?first input vector, sum output, 16-byte aligned
>> + ? ? * @param v2 ?second input vector, difference output, 16-byte aligned
>> + ? ? * @param len length of vectors, multiple of 4
>> + ? ? */
>> + ? ?void (*butterflies_float)(float *v1, float *v2, int len);
>
> I'd really like to see the "restrict" qualifier on this one. It makes
> no sense to call it with the same vector for both inputs.

Added locally.

-- 
M?ns Rullg?rd
mans at mansr.com