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Diffstat (limited to '')
| -rw-r--r-- | media/ffvpx/libavcodec/mpegaudiodsp.c | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/media/ffvpx/libavcodec/mpegaudiodsp.c b/media/ffvpx/libavcodec/mpegaudiodsp.c new file mode 100644 index 0000000000..5a5a679d91 --- /dev/null +++ b/media/ffvpx/libavcodec/mpegaudiodsp.c @@ -0,0 +1,113 @@ +/* + * Copyright (c) 2011 Mans Rullgard + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include "config.h" +#include "libavutil/attributes.h" +#include "libavutil/thread.h" +#include "mpegaudio.h" +#include "mpegaudiodsp.h" +#include "dct.h" +#include "dct32.h" + +static AVOnce mpadsp_table_init = AV_ONCE_INIT; + +static av_cold void mpadsp_init_tabs(void) +{ + int i, j; + /* 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 * IMDCT_SCALAR / cos(M_PI * (2 * i + 19) / 72); + + if (j == 2) { + ff_mdct_win_float[j][i/3] = d / (1 << 5); + ff_mdct_win_fixed[j][i/3] = d / (1 << 5) * (1LL << 32) + 0.5; + } else { + int idx = i < 18 ? i : i + (MDCT_BUF_SIZE/2 - 18); + ff_mdct_win_float[j][idx] = d / (1 << 5); + ff_mdct_win_fixed[j][idx] = d / (1 << 5) * (1LL << 32) + 0.5; + } + } + } + + /* NOTE: we do frequency inversion after the MDCT by changing + the sign of the right window coefs */ + for (j = 0; j < 4; j++) { + for (i = 0; i < MDCT_BUF_SIZE; i += 2) { + ff_mdct_win_float[j + 4][i ] = ff_mdct_win_float[j][i ]; + ff_mdct_win_float[j + 4][i + 1] = -ff_mdct_win_float[j][i + 1]; + ff_mdct_win_fixed[j + 4][i ] = ff_mdct_win_fixed[j][i ]; + ff_mdct_win_fixed[j + 4][i + 1] = -ff_mdct_win_fixed[j][i + 1]; + } + } + +#if ARCH_X86 + ff_mpadsp_init_x86_tabs(); +#endif +} + +av_cold void ff_mpadsp_init(MPADSPContext *s) +{ + DCTContext dct; + + ff_dct_init(&dct, 5, DCT_II); + ff_thread_once(&mpadsp_table_init, &mpadsp_init_tabs); + + s->apply_window_float = ff_mpadsp_apply_window_float; + s->apply_window_fixed = ff_mpadsp_apply_window_fixed; + + s->dct32_float = dct.dct32; + s->dct32_fixed = ff_dct32_fixed; + + s->imdct36_blocks_float = ff_imdct36_blocks_float; + s->imdct36_blocks_fixed = ff_imdct36_blocks_fixed; + +#if ARCH_AARCH64 + ff_mpadsp_init_aarch64(s); +#elif ARCH_ARM + ff_mpadsp_init_arm(s); +#elif ARCH_PPC + ff_mpadsp_init_ppc(s); +#elif ARCH_X86 + ff_mpadsp_init_x86(s); +#endif +#if HAVE_MIPSFPU + ff_mpadsp_init_mipsfpu(s); +#endif +#if HAVE_MIPSDSP + ff_mpadsp_init_mipsdsp(s); +#endif +} |