[FFmpeg-devel] PATCH: COOK audio decode infastructure to support fixpoint optimization

Benjamin Larsson banan
Sun Jul 15 23:26:04 CEST 2007

Marc Hoffman wrote:
> On 7/15/07, Benjamin Larsson <banan at ludd.ltu.se> wrote:
>> Marc Hoffman wrote:
>>> +
>>> +static void joint_decode(COOKContext *q, vec_t* mlt_buffer1,
>>> +                         vec_t* mlt_buffer2) {
>>> +    int decouple_tab[SUBBAND_SIZE];
>>> +    vec_t *decode_buffer;
>>> +
>>> +    decode_buffer = av_malloc (1060*q->f_sample_size);
>> Don't allocate memory with malloc during decode. Use a fixed max size.
> why? your just allocating a really big buffer on the stack which causes
> actually problems for a machine with out a address translation.  Would it be
> acceptable to put that extra memory into COOKContext instead?
> Marc

Sure, either preallocate the needed memory or keep it on the stack. The
malloc here could take long time or even fail to allocate the needed memory.

Benjamin Larsson

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