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Separate code in imdct_and_windowing() into distinct IMDCT, windowing and

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buffer update sections

Originally committed as revision 14906 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Robert Swain 2008-08-22 18:18:50 +00:00
parent 95801b6a07
commit f49905588a
1 changed files with 24 additions and 19 deletions
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43
libavcodec/aac.c
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@ -1173,6 +1173,7 @@ static void imdct_and_windowing(AACContext * ac, SingleChannelElement * sce) {
float * buf = ac->buf_mdct;
int i;
// imdct
if (ics->window_sequence[0] == EIGHT_SHORT_SEQUENCE) {
if (ics->window_sequence[1] == ONLY_LONG_SEQUENCE || ics->window_sequence[1] == LONG_STOP_SEQUENCE)
av_log(ac->avccontext, AV_LOG_WARNING,
@ -1182,45 +1183,49 @@ static void imdct_and_windowing(AACContext * ac, SingleChannelElement * sce) {
ff_imdct_calc(&ac->mdct_small, buf + i, in + i/2);
ac->dsp.vector_fmul_reverse(ac->revers + i/2, buf + i + 128, swindow, 128);
}
} else
ff_imdct_calc(&ac->mdct, buf, in);
/* window overlapping
* NOTE: To simplify the overlapping code, all 'meaningless' short to long
* and long to short transitions are considered to be short to short
* transitions. This leaves just two cases (long to long and short to short)
* with a little special sauce for EIGHT_SHORT_SEQUENCE.
*/
if ((ics->window_sequence[1] == ONLY_LONG_SEQUENCE || ics->window_sequence[1] == LONG_STOP_SEQUENCE) &&
(ics->window_sequence[0] == ONLY_LONG_SEQUENCE || ics->window_sequence[0] == LONG_START_SEQUENCE)) {
ac->dsp.vector_fmul_add_add(out, buf, lwindow_prev, saved, ac->add_bias, 1024, 1);
} else {
for (i = 0; i < 448; i++) out[i] = saved[i] + ac->add_bias;
if (ics->window_sequence[0] == EIGHT_SHORT_SEQUENCE) {
ac->dsp.vector_fmul_add_add(out + 448 + 0*128, buf + 0*128, swindow_prev, saved + 448 , ac->add_bias, 128, 1);
ac->dsp.vector_fmul_add_add(out + 448 + 1*128, buf + 2*128, swindow, ac->revers + 0*128, ac->add_bias, 128, 1);
ac->dsp.vector_fmul_add_add(out + 448 + 2*128, buf + 4*128, swindow, ac->revers + 1*128, ac->add_bias, 128, 1);
ac->dsp.vector_fmul_add_add(out + 448 + 3*128, buf + 6*128, swindow, ac->revers + 2*128, ac->add_bias, 128, 1);
ac->dsp.vector_fmul_add_add(out + 448 + 4*128, buf + 8*128, swindow, ac->revers + 3*128, ac->add_bias, 64, 1);
} else {
ac->dsp.vector_fmul_add_add(out + 448, buf + 448, swindow_prev, saved + 448, ac->add_bias, 128, 1);
for (i = 576; i < 1024; i++) out[i] = buf[i] + saved[i] + ac->add_bias;
}
}
#if 0
vector_fmul_add_add_add(&ac->dsp, out + 448 + 1*128, buf + 2*128, swindow, saved + 448 + 1*128, ac->revers + 0*128, ac->add_bias, 128);
vector_fmul_add_add_add(&ac->dsp, out + 448 + 2*128, buf + 4*128, swindow, saved + 448 + 2*128, ac->revers + 1*128, ac->add_bias, 128);
vector_fmul_add_add_add(&ac->dsp, out + 448 + 3*128, buf + 6*128, swindow, saved + 448 + 3*128, ac->revers + 2*128, ac->add_bias, 128);
vector_fmul_add_add_add(&ac->dsp, out + 448 + 4*128, buf + 8*128, swindow, saved + 448 + 4*128, ac->revers + 3*128, ac->add_bias, 64);
#endif
// buffer update
if (ics->window_sequence[0] == EIGHT_SHORT_SEQUENCE) {
ac->dsp.vector_fmul_add_add(saved, buf + 1024 + 64, swindow + 64, ac->revers + 3*128+64, 0, 64, 1);
ac->dsp.vector_fmul_add_add(saved + 64, buf + 1024 + 2*128, swindow, ac->revers + 4*128, 0, 128, 1);
ac->dsp.vector_fmul_add_add(saved + 192, buf + 1024 + 4*128, swindow, ac->revers + 5*128, 0, 128, 1);
ac->dsp.vector_fmul_add_add(saved + 320, buf + 1024 + 6*128, swindow, ac->revers + 6*128, 0, 128, 1);
memcpy( saved + 448, ac->revers + 7*128, 128 * sizeof(float));
memset( saved + 576, 0, 448 * sizeof(float));
} else {
ff_imdct_calc(&ac->mdct, buf, in);
if (ics->window_sequence[0] == LONG_STOP_SEQUENCE) {
for (i = 0; i < 448; i++) out[i] = saved[i] + ac->add_bias;
ac->dsp.vector_fmul_add_add(out + 448, buf + 448, swindow_prev, saved + 448, ac->add_bias, 128, 1);
for (i = 576; i < 1024; i++) out[i] = buf[i] + saved[i] + ac->add_bias;
} else {
ac->dsp.vector_fmul_add_add(out, buf, lwindow_prev, saved, ac->add_bias, 1024, 1);
}
if (ics->window_sequence[0] == LONG_START_SEQUENCE) {
} else if (ics->window_sequence[0] == LONG_START_SEQUENCE) {
memcpy(saved, buf + 1024, 448 * sizeof(float));
ac->dsp.vector_fmul_reverse(saved + 448, buf + 1024 + 448, swindow, 128);
memset(saved + 576, 0, 448 * sizeof(float));
} else {
} else { // LONG_STOP or ONLY_LONG
ac->dsp.vector_fmul_reverse(saved, buf + 1024, lwindow, 1024);
}
}
}
/**
* Apply dependent channel coupling (applied before IMDCT).