diff options
Diffstat (limited to 'ffmpeg/libavcodec/gsmdec_template.c')
| -rw-r--r-- | ffmpeg/libavcodec/gsmdec_template.c | 160 |
1 files changed, 0 insertions, 160 deletions
diff --git a/ffmpeg/libavcodec/gsmdec_template.c b/ffmpeg/libavcodec/gsmdec_template.c deleted file mode 100644 index 0c60813..0000000 --- a/ffmpeg/libavcodec/gsmdec_template.c +++ /dev/null @@ -1,160 +0,0 @@ -/* - * gsm 06.10 decoder - * Copyright (c) 2010 Reimar Döffinger <Reimar.Doeffinger@gmx.de> - * - * 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 - */ - -/** - * @file - * GSM decoder - */ - -#include "get_bits.h" -#include "gsm.h" -#include "gsmdec_data.h" - -static const int requant_tab[4][8] = { - { 0 }, - { 0, 7 }, - { 0, 2, 5, 7 }, - { 0, 1, 2, 3, 4, 5, 6, 7 } -}; - -static void apcm_dequant_add(GetBitContext *gb, int16_t *dst, const int *frame_bits) -{ - int i, val; - int maxidx = get_bits(gb, 6); - const int16_t *tab = ff_gsm_dequant_tab[maxidx]; - for (i = 0; i < 13; i++) { - val = get_bits(gb, frame_bits[i]); - dst[3*i] += tab[requant_tab[frame_bits[i]][val]]; - } -} - -static inline int gsm_mult(int a, int b) -{ - return (a * b + (1 << 14)) >> 15; -} - -static void long_term_synth(int16_t *dst, int lag, int gain_idx) -{ - int i; - const int16_t *src = dst - lag; - uint16_t gain = ff_gsm_long_term_gain_tab[gain_idx]; - for (i = 0; i < 40; i++) - dst[i] = gsm_mult(gain, src[i]); -} - -static inline int decode_log_area(int coded, int factor, int offset) -{ - coded <<= 10; - coded -= offset; - return gsm_mult(coded, factor) << 1; -} - -static av_noinline int get_rrp(int filtered) -{ - int abs = FFABS(filtered); - if (abs < 11059) abs <<= 1; - else if (abs < 20070) abs += 11059; - else abs = (abs >> 2) + 26112; - return filtered < 0 ? -abs : abs; -} - -static int filter_value(int in, int rrp[8], int v[9]) -{ - int i; - for (i = 7; i >= 0; i--) { - in -= gsm_mult(rrp[i], v[i]); - v[i + 1] = v[i] + gsm_mult(rrp[i], in); - } - v[0] = in; - return in; -} - -static void short_term_synth(GSMContext *ctx, int16_t *dst, const int16_t *src) -{ - int i; - int rrp[8]; - int *lar = ctx->lar[ctx->lar_idx]; - int *lar_prev = ctx->lar[ctx->lar_idx ^ 1]; - for (i = 0; i < 8; i++) - rrp[i] = get_rrp((lar_prev[i] >> 2) + (lar_prev[i] >> 1) + (lar[i] >> 2)); - for (i = 0; i < 13; i++) - dst[i] = filter_value(src[i], rrp, ctx->v); - - for (i = 0; i < 8; i++) - rrp[i] = get_rrp((lar_prev[i] >> 1) + (lar [i] >> 1)); - for (i = 13; i < 27; i++) - dst[i] = filter_value(src[i], rrp, ctx->v); - - for (i = 0; i < 8; i++) - rrp[i] = get_rrp((lar_prev[i] >> 2) + (lar [i] >> 1) + (lar[i] >> 2)); - for (i = 27; i < 40; i++) - dst[i] = filter_value(src[i], rrp, ctx->v); - - for (i = 0; i < 8; i++) - rrp[i] = get_rrp(lar[i]); - for (i = 40; i < 160; i++) - dst[i] = filter_value(src[i], rrp, ctx->v); - - ctx->lar_idx ^= 1; -} - -static int postprocess(int16_t *data, int msr) -{ - int i; - for (i = 0; i < 160; i++) { - msr = av_clip_int16(data[i] + gsm_mult(msr, 28180)); - data[i] = av_clip_int16(msr << 1) & ~7; - } - return msr; -} - -static int gsm_decode_block(AVCodecContext *avctx, int16_t *samples, - GetBitContext *gb, int mode) -{ - GSMContext *ctx = avctx->priv_data; - int i; - int16_t *ref_dst = ctx->ref_buf + 120; - int *lar = ctx->lar[ctx->lar_idx]; - lar[0] = decode_log_area(get_bits(gb, 6), 13107, 1 << 15); - lar[1] = decode_log_area(get_bits(gb, 6), 13107, 1 << 15); - lar[2] = decode_log_area(get_bits(gb, 5), 13107, (1 << 14) + 2048*2); - lar[3] = decode_log_area(get_bits(gb, 5), 13107, (1 << 14) - 2560*2); - lar[4] = decode_log_area(get_bits(gb, 4), 19223, (1 << 13) + 94*2); - lar[5] = decode_log_area(get_bits(gb, 4), 17476, (1 << 13) - 1792*2); - lar[6] = decode_log_area(get_bits(gb, 3), 31454, (1 << 12) - 341*2); - lar[7] = decode_log_area(get_bits(gb, 3), 29708, (1 << 12) - 1144*2); - - for (i = 0; i < 4; i++) { - int lag = get_bits(gb, 7); - int gain_idx = get_bits(gb, 2); - int offset = get_bits(gb, 2); - lag = av_clip(lag, 40, 120); - long_term_synth(ref_dst, lag, gain_idx); - apcm_dequant_add(gb, ref_dst + offset, ff_gsm_apcm_bits[mode][i]); - ref_dst += 40; - } - memcpy(ctx->ref_buf, ctx->ref_buf + 160, 120 * sizeof(*ctx->ref_buf)); - short_term_synth(ctx, samples, ctx->ref_buf + 120); - // for optimal speed this could be merged with short_term_synth, - // not done yet because it is a bit ugly - ctx->msr = postprocess(samples, ctx->msr); - return 0; -} |