RepoMirrors
/
ffmpeg
mirror of https://git.ffmpeg.org/ffmpeg.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity

Fix the fixed-point MDCT and FFT tests so that they actually compile and work. 

Also, use LFG from libavutil instead of random().

Originally committed as revision 25955 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Justin Ruggles 2010-12-14 14:50:58 +00:00
parent a8d2b06b7c
commit 228315bbd3
1 changed files with 30 additions and 34 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

64
libavcodec/ac3enc.c
View File

@ -1280,14 +1280,15 @@ static av_cold int AC3_encode_close(AVCodecContext *avctx)
return 0;
}
#if 0
#ifdef TEST
/*************************************************************************/
/* TEST */
#undef random
#define FN (N/4)
#include "libavutil/lfg.h"
void fft_test(void)
#define FN (MDCT_SAMPLES/4)
static void fft_test(AVLFG *lfg)
{
IComplex in[FN], in1[FN];
int k, n, i;
@ -1296,8 +1297,8 @@ void fft_test(void)
/* FFT test */
for(i=0;i<FN;i++) {
in[i].re = random() % 65535 - 32767;
in[i].im = random() % 65535 - 32767;
in[i].re = av_lfg_get(lfg) % 65535 - 32767;
in[i].im = av_lfg_get(lfg) % 65535 - 32767;
in1[i] = in[i];
}
fft(in, 7);
@ -1311,67 +1312,62 @@ void fft_test(void)
sum_re += in1[n].re * cos(a) - in1[n].im * sin(a);
sum_im += in1[n].re * sin(a) + in1[n].im * cos(a);
}
printf("%3d: %6d,%6d %6.0f,%6.0f\n",
av_log(NULL, AV_LOG_DEBUG, "%3d: %6d,%6d %6.0f,%6.0f\n",
k, in[k].re, in[k].im, sum_re / FN, sum_im / FN);
}
}
void mdct_test(void)
static void mdct_test(AVLFG *lfg)
{
int16_t input[N];
int32_t output[N/2];
float input1[N];
float output1[N/2];
int16_t input[MDCT_SAMPLES];
int32_t output[AC3_MAX_COEFS];
float input1[MDCT_SAMPLES];
float output1[AC3_MAX_COEFS];
float s, a, err, e, emax;
int i, k, n;
for(i=0;i<N;i++) {
input[i] = (random() % 65535 - 32767) * 9 / 10;
for(i=0;i<MDCT_SAMPLES;i++) {
input[i] = (av_lfg_get(lfg) % 65535 - 32767) * 9 / 10;
input1[i] = input[i];
}
mdct512(output, input);
/* do it by hand */
for(k=0;k<N/2;k++) {
for(k=0;k<AC3_MAX_COEFS;k++) {
s = 0;
for(n=0;n<N;n++) {
a = (2*M_PI*(2*n+1+N/2)*(2*k+1) / (4 * N));
for(n=0;n<MDCT_SAMPLES;n++) {
a = (2*M_PI*(2*n+1+MDCT_SAMPLES/2)*(2*k+1) / (4 * MDCT_SAMPLES));
s += input1[n] * cos(a);
}
output1[k] = -2 * s / N;
output1[k] = -2 * s / MDCT_SAMPLES;
}
err = 0;
emax = 0;
for(i=0;i<N/2;i++) {
printf("%3d: %7d %7.0f\n", i, output[i], output1[i]);
for(i=0;i<AC3_MAX_COEFS;i++) {
av_log(NULL, AV_LOG_DEBUG, "%3d: %7d %7.0f\n", i, output[i], output1[i]);
e = output[i] - output1[i];
if (e > emax)
emax = e;
err += e * e;
}
printf("err2=%f emax=%f\n", err / (N/2), emax);
av_log(NULL, AV_LOG_DEBUG, "err2=%f emax=%f\n", err / AC3_MAX_COEFS, emax);
}
void test_ac3(void)
int main(void)
{
AC3EncodeContext ctx;
unsigned char frame[AC3_MAX_CODED_FRAME_SIZE];
int16_t samples[AC3_FRAME_SIZE];
int ret, i;
AVLFG lfg;
AC3_encode_init(&ctx, 44100, 64000, 1);
av_log_set_level(AV_LOG_DEBUG);
mdct_init(9);
fft_test();
mdct_test();
fft_test(&lfg);
mdct_test(&lfg);
for(i=0;i<AC3_FRAME_SIZE;i++)
samples[i] = (int)(sin(2*M_PI*i*1000.0/44100) * 10000);
ret = AC3_encode_frame(&ctx, frame, samples);
printf("ret=%d\n", ret);
return 0;
}
#endif
#endif /* TEST */
AVCodec ac3_encoder = {
"ac3",