Re: [FFmpeg-devel] [PATCHv5] checkasm/lpc: test compute_autocorr

["Rémi Denis-Courmont" <remi@remlab.net>]

Le 31 mai 2024 00:56:21 GMT+03:00, James Almer <jamrial@gmail.com> a écrit :
>On 5/30/2024 12:58 PM, Rémi Denis-Courmont wrote:
>> Also restrict length to even values as per (questionable) assumption in
>> the reference C code.
>> ---
>>   tests/checkasm/lpc.c | 59 +++++++++++++++++++++++++++++++++++++++++---
>>   1 file changed, 56 insertions(+), 3 deletions(-)
>> 
>> diff --git a/tests/checkasm/lpc.c b/tests/checkasm/lpc.c
>> index 592e34c03d..f9f3d84080 100644
>> --- a/tests/checkasm/lpc.c
>> +++ b/tests/checkasm/lpc.c
>> @@ -16,6 +16,7 @@
>>    * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
>>    */
>>   +#include "libavutil/avassert.h"
>>   #include "libavutil/mem_internal.h"
>>     #include "libavcodec/lpc.h"
>> @@ -30,7 +31,7 @@
>>           }                                                                 \
>>       } while (0)
>>   -#define EPS 0.005
>> +#define EPS 0.0001
>
>Wont this end up in failures for some targets?

Not that I know. That was an awful high value for double precision.

>>     static void test_window(int len)
>>   {
>> @@ -57,10 +58,51 @@ static void test_window(int len)
>>       bench_new(src, len, dst1);
>>   }
>>   +#if !ARCH_X86
>> +static void test_compute_autocorr(ptrdiff_t len, int lag)
>> +{
>> +    const double eps = EPS * (double)len;
>> +    LOCAL_ALIGNED(32, double, src, [5000 + 2 + MAX_LPC_ORDER]);
>> +    LOCAL_ALIGNED(16, double, dst0, [MAX_LPC_ORDER + 1]);
>> +    LOCAL_ALIGNED(16, double, dst1, [MAX_LPC_ORDER + 1]);
>> +
>> +    declare_func(void, const double *in, ptrdiff_t len, int lag, double *out);
>> +
>> +    av_assert0(lag >= 0 && lag <= MAX_LPC_ORDER);
>> +
>> +    for (int i = 0; i < MAX_LPC_ORDER; i++)
>> +        src[i] = 0.;
>> +
>> +    src += MAX_LPC_ORDER;
>> +
>> +    for (int i = 0; i < 5000 + 2; i++) {
>> +        src[i] = (double)rnd() / (double)UINT_MAX;
>> +    }
>> +
>> +    call_ref(src, len, lag, dst0);
>> +    call_new(src, len, lag, dst1);
>> +
>> +    for (size_t i = 0; i <= lag; i++) {
>> +        if (!double_near_abs_eps(dst0[i], dst1[i], eps)) {
>> +            fprintf(stderr, "%zu: %- .12f - %- .12f = % .12g\n",
>> +                    i, dst0[i], dst1[i], dst0[i] - dst1[i]);
>> +            fail();
>> +            break;
>> +        }
>> +    }
>> +
>> +    bench_new(src, 4608, lag, dst1);
>> +}
>> +#endif
>> +
>>   void checkasm_check_lpc(void)
>>   {
>>       LPCContext ctx;
>> -    int len = rnd() % 5000;
>> +    int len = 2000 + rnd() % 3000;
>> +#if !ARCH_X86
>> +    static const int lags[] = { 8, 12, };
>> +#endif
>> +
>>       ff_lpc_init(&ctx, 32, 16, FF_LPC_TYPE_DEFAULT);
>>         if (check_func(ctx.lpc_apply_welch_window, "apply_welch_window_even")) {
>> @@ -72,6 +114,17 @@ void checkasm_check_lpc(void)
>>           test_window(len | 1);
>>       }
>>       report("apply_welch_window_odd");
>> -
>>       ff_lpc_end(&ctx);
>> +
>> +#if !ARCH_X86
>> +    for (size_t i = 0; i < FF_ARRAY_ELEMS(lags); i++) {
>> +        ff_lpc_init(&ctx, len, lags[i], FF_LPC_TYPE_DEFAULT);
>> +        if (check_func(ctx.lpc_compute_autocorr, "autocorr_%d", lags[i])) {
>> +            test_compute_autocorr(len & ~1, lags[i]);
>> +            /*TODO: test_compute_autocorr(len | 1, lags[i]);*/
>> +        }
>> +        ff_lpc_end(&ctx);
>> +    }
>> +    report("compute_autocorr");
>> +#endif
>>   }
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