From 704721bc9cb47c58ce3dff8ef64ce3fb85283069 Mon Sep 17 00:00:00 2001 From: Justin Ruggles Date: Sat, 22 Oct 2011 17:49:50 -0400 Subject: g722: split decoder and encoder into separate files --- libavcodec/g722.h | 74 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 74 insertions(+) create mode 100644 libavcodec/g722.h (limited to 'libavcodec/g722.h') diff --git a/libavcodec/g722.h b/libavcodec/g722.h new file mode 100644 index 0000000000..5edb6c8119 --- /dev/null +++ b/libavcodec/g722.h @@ -0,0 +1,74 @@ +/* + * Copyright (c) CMU 1993 Computer Science, Speech Group + * Chengxiang Lu and Alex Hauptmann + * Copyright (c) 2005 Steve Underwood + * Copyright (c) 2009 Kenan Gillet + * Copyright (c) 2010 Martin Storsjo + * + * This file is part of Libav. + * + * Libav 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. + * + * Libav 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 Libav; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#ifndef AVCODEC_G722_H +#define AVCODEC_G722_H + +#include + +#define PREV_SAMPLES_BUF_SIZE 1024 + +typedef struct { + int16_t prev_samples[PREV_SAMPLES_BUF_SIZE]; ///< memory of past decoded samples + int prev_samples_pos; ///< the number of values in prev_samples + + /** + * The band[0] and band[1] correspond respectively to the lower band and higher band. + */ + struct G722Band { + int16_t s_predictor; ///< predictor output value + int32_t s_zero; ///< previous output signal from zero predictor + int8_t part_reconst_mem[2]; ///< signs of previous partially reconstructed signals + int16_t prev_qtzd_reconst; ///< previous quantized reconstructed signal (internal value, using low_inv_quant4) + int16_t pole_mem[2]; ///< second-order pole section coefficient buffer + int32_t diff_mem[6]; ///< quantizer difference signal memory + int16_t zero_mem[6]; ///< Seventh-order zero section coefficient buffer + int16_t log_factor; ///< delayed 2-logarithmic quantizer factor + int16_t scale_factor; ///< delayed quantizer scale factor + } band[2]; + + struct TrellisNode { + struct G722Band state; + uint32_t ssd; + int path; + } *node_buf[2], **nodep_buf[2]; + + struct TrellisPath { + int value; + int prev; + } *paths[2]; +} G722Context; + +extern const int16_t ff_g722_high_inv_quant[4]; +extern const int16_t ff_g722_low_inv_quant4[16]; +extern const int16_t ff_g722_low_inv_quant6[64]; + +void ff_g722_update_low_predictor(struct G722Band *band, const int ilow); + +void ff_g722_update_high_predictor(struct G722Band *band, const int dhigh, + const int ihigh); + +void ff_g722_apply_qmf(const int16_t *prev_samples, int *xout1, int *xout2); + +#endif /* AVCODEC_G722_H */ -- cgit v1.2.3