diff options
Diffstat (limited to 'libavcodec/mpegaudiodec.c')
| -rw-r--r-- | libavcodec/mpegaudiodec.c | 89 |
1 files changed, 20 insertions, 69 deletions
diff --git a/libavcodec/mpegaudiodec.c b/libavcodec/mpegaudiodec.c index eae030ce44..18ef40e011 100644 --- a/libavcodec/mpegaudiodec.c +++ b/libavcodec/mpegaudiodec.c @@ -132,10 +132,6 @@ static uint16_t band_index_long[9][23]; static INTFLOAT is_table[2][16]; static INTFLOAT is_table_lsf[2][2][16]; static INTFLOAT csa_table[8][4]; -/** Window for MDCT. Note that only the component [0,17] and [20,37] are used, - the components 18 and 19 are there only to assure 128-bit alignment for asm - */ -DECLARE_ALIGNED(16, static INTFLOAT, mdct_win)[8][40]; static int16_t division_tab3[1<<6 ]; static int16_t division_tab5[1<<8 ]; @@ -422,45 +418,6 @@ static av_cold void decode_init_static(void) csa_table[i][3] = ca - cs; #endif } - - /* compute mdct windows */ - for (i = 0; i < 36; i++) { - for (j = 0; j < 4; j++) { - double d; - - if (j == 2 && i % 3 != 1) - continue; - - d = sin(M_PI * (i + 0.5) / 36.0); - if (j == 1) { - if (i >= 30) d = 0; - else if (i >= 24) d = sin(M_PI * (i - 18 + 0.5) / 12.0); - else if (i >= 18) d = 1; - } else if (j == 3) { - if (i < 6) d = 0; - else if (i < 12) d = sin(M_PI * (i - 6 + 0.5) / 12.0); - else if (i < 18) d = 1; - } - //merge last stage of imdct into the window coefficients - d *= 0.5 / cos(M_PI * (2 * i + 19) / 72); - - if (j == 2) - mdct_win[j][i/3] = FIXHR((d / (1<<5))); - else { - int idx = i < 18 ? i : i + 2; - mdct_win[j][idx] = FIXHR((d / (1<<5))); - } - } - } - - /* NOTE: we do frequency inversion adter the MDCT by changing - the sign of the right window coefs */ - for (j = 0; j < 4; j++) { - for (i = 0; i < 40; i += 2) { - mdct_win[j + 4][i ] = mdct_win[j][i ]; - mdct_win[j + 4][i + 1] = -mdct_win[j][i + 1]; - } - } } static av_cold int decode_init(AVCodecContext * avctx) @@ -1284,59 +1241,53 @@ static void compute_imdct(MPADecodeContext *s, GranuleDef *g, mdct_long_end = sblimit; } - buf = mdct_buf; - ptr = g->sb_hybrid; - for (j = 0; j < mdct_long_end; j++) { - int win_idx = (g->switch_point && j < 2) ? 0 : g->block_type; - /* apply window & overlap with previous buffer */ - out_ptr = sb_samples + j; - /* select window */ - win = mdct_win[win_idx + (4 & -(j & 1))]; - s->mpadsp.RENAME(imdct36)(out_ptr, buf, ptr, win); - out_ptr += 18 * SBLIMIT; - ptr += 18; - buf += 18; - } + s->mpadsp.RENAME(imdct36_blocks)(sb_samples, mdct_buf, g->sb_hybrid, + mdct_long_end, g->switch_point, + g->block_type); + + buf = mdct_buf + 4*18*(mdct_long_end >> 2) + (mdct_long_end & 3); + ptr = g->sb_hybrid + 18 * mdct_long_end; + for (j = mdct_long_end; j < sblimit; j++) { /* select frequency inversion */ - win = mdct_win[2 + (4 & -(j & 1))]; + win = RENAME(ff_mdct_win)[2 + (4 & -(j & 1))]; out_ptr = sb_samples + j; for (i = 0; i < 6; i++) { - *out_ptr = buf[i]; + *out_ptr = buf[4*i]; out_ptr += SBLIMIT; } imdct12(out2, ptr + 0); for (i = 0; i < 6; i++) { - *out_ptr = MULH3(out2[i ], win[i ], 1) + buf[i + 6*1]; - buf[i + 6*2] = MULH3(out2[i + 6], win[i + 6], 1); + *out_ptr = MULH3(out2[i ], win[i ], 1) + buf[4*(i + 6*1)]; + buf[4*(i + 6*2)] = MULH3(out2[i + 6], win[i + 6], 1); out_ptr += SBLIMIT; } imdct12(out2, ptr + 1); for (i = 0; i < 6; i++) { - *out_ptr = MULH3(out2[i ], win[i ], 1) + buf[i + 6*2]; - buf[i + 6*0] = MULH3(out2[i + 6], win[i + 6], 1); + *out_ptr = MULH3(out2[i ], win[i ], 1) + buf[4*(i + 6*2)]; + buf[4*(i + 6*0)] = MULH3(out2[i + 6], win[i + 6], 1); out_ptr += SBLIMIT; } imdct12(out2, ptr + 2); for (i = 0; i < 6; i++) { - buf[i + 6*0] = MULH3(out2[i ], win[i ], 1) + buf[i + 6*0]; - buf[i + 6*1] = MULH3(out2[i + 6], win[i + 6], 1); - buf[i + 6*2] = 0; + buf[4*(i + 6*0)] = MULH3(out2[i ], win[i ], 1) + buf[4*(i + 6*0)]; + buf[4*(i + 6*1)] = MULH3(out2[i + 6], win[i + 6], 1); + buf[4*(i + 6*2)] = 0; } ptr += 18; - buf += 18; + buf += (j&3) != 3 ? 1 : (4*18-3); } /* zero bands */ for (j = sblimit; j < SBLIMIT; j++) { /* overlap */ out_ptr = sb_samples + j; for (i = 0; i < 18; i++) { - *out_ptr = buf[i]; - buf[i] = 0; + *out_ptr = buf[4*i]; + buf[4*i] = 0; out_ptr += SBLIMIT; } - buf += 18; + buf += (j&3) != 3 ? 1 : (4*18-3); } } |