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![Michael Niedermayer](/assets/img/avatar_default.png)
* qatar/master: (30 commits) AVOptions: make default_val a union, as proposed in AVOption2. arm/h264pred: add missing argument type. h264dsp_mmx: place bracket outside #if/#endif block. lavf/utils: fix ff_interleave_compare_dts corner case. fate: add 10-bit H264 tests. h264: do not print "too many references" warning for intra-only. Enable decoding of high bit depth h264. Adds 8-, 9- and 10-bit versions of some of the functions used by the h264 decoder. Add support for higher QP values in h264. Add the notion of pixel size in h264 related functions. Make the h264 loop filter bit depth aware. Template dsputil_template.c with respect to pixel size, etc. Template h264idct_template.c with respect to pixel size, etc. Preparatory patch for high bit depth h264 decoding support. Move some functions in dsputil.c into a new file dsputil_template.c. Move the functions in h264idct into a new file h264idct_template.c. Move the functions in h264pred.c into a new file h264pred_template.c. Preparatory patch for high bit depth h264 decoding support. Add pixel formats for 9- and 10-bit yuv420p. Choose h264 chroma dc dequant function dynamically. ... Conflicts: doc/APIchanges ffmpeg.c ffplay.c libavcodec/alpha/dsputil_alpha.c libavcodec/arm/dsputil_init_arm.c libavcodec/arm/dsputil_init_armv6.c libavcodec/arm/dsputil_init_neon.c libavcodec/arm/dsputil_iwmmxt.c libavcodec/arm/h264pred_init_arm.c libavcodec/bfin/dsputil_bfin.c libavcodec/dsputil.c libavcodec/h264.c libavcodec/h264.h libavcodec/h264_cabac.c libavcodec/h264_cavlc.c libavcodec/h264_loopfilter.c libavcodec/h264_ps.c libavcodec/h264_refs.c libavcodec/h264dsp.c libavcodec/h264idct.c libavcodec/h264pred.c libavcodec/mlib/dsputil_mlib.c libavcodec/options.c libavcodec/ppc/dsputil_altivec.c libavcodec/ppc/dsputil_ppc.c libavcodec/ppc/h264_altivec.c libavcodec/ps2/dsputil_mmi.c libavcodec/sh4/dsputil_align.c libavcodec/sh4/dsputil_sh4.c libavcodec/sparc/dsputil_vis.c libavcodec/utils.c libavcodec/version.h libavcodec/x86/dsputil_mmx.c libavformat/options.c libavformat/utils.c libavutil/pixfmt.h libswscale/swscale.c libswscale/swscale_internal.h libswscale/swscale_template.c tests/ref/seek/lavf_avi Merged-by: Michael Niedermayer <michaelni@gmx.at>
161 lines
4.7 KiB
C
161 lines
4.7 KiB
C
/**
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* LPC utility code
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* Copyright (c) 2006 Justin Ruggles <justin.ruggles@gmail.com>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVCODEC_LPC_H
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#define AVCODEC_LPC_H
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#include <stdint.h>
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#include "dsputil.h"
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#define ORDER_METHOD_EST 0
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#define ORDER_METHOD_2LEVEL 1
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#define ORDER_METHOD_4LEVEL 2
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#define ORDER_METHOD_8LEVEL 3
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#define ORDER_METHOD_SEARCH 4
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#define ORDER_METHOD_LOG 5
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#define MIN_LPC_ORDER 1
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#define MAX_LPC_ORDER 32
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/**
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* LPC analysis type
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*/
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enum FFLPCType {
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FF_LPC_TYPE_DEFAULT = -1, ///< use the codec default LPC type
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FF_LPC_TYPE_NONE = 0, ///< do not use LPC prediction or use all zero coefficients
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FF_LPC_TYPE_FIXED = 1, ///< fixed LPC coefficients
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FF_LPC_TYPE_LEVINSON = 2, ///< Levinson-Durbin recursion
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FF_LPC_TYPE_CHOLESKY = 3, ///< Cholesky factorization
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FF_LPC_TYPE_NB , ///< Not part of ABI
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};
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typedef struct LPCContext {
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int blocksize;
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int max_order;
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enum FFLPCType lpc_type;
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double *windowed_samples;
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/**
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* Apply a Welch window to an array of input samples.
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* The output samples have the same scale as the input, but are in double
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* sample format.
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* @param data input samples
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* @param len number of input samples
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* @param w_data output samples
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*/
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void (*lpc_apply_welch_window)(const int32_t *data, int len,
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double *w_data);
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/**
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* Perform autocorrelation on input samples with delay of 0 to lag.
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* @param data input samples.
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* constraints: no alignment needed, but must have have at
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* least lag*sizeof(double) valid bytes preceeding it, and
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* size must be at least (len+1)*sizeof(double) if data is
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* 16-byte aligned or (len+2)*sizeof(double) if data is
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* unaligned.
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* @param len number of input samples to process
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* @param lag maximum delay to calculate
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* @param autoc output autocorrelation coefficients.
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* constraints: array size must be at least lag+1.
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*/
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void (*lpc_compute_autocorr)(const double *data, int len, int lag,
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double *autoc);
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} LPCContext;
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/**
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* Calculate LPC coefficients for multiple orders
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*/
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int ff_lpc_calc_coefs(LPCContext *s,
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const int32_t *samples, int blocksize, int min_order,
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int max_order, int precision,
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int32_t coefs[][MAX_LPC_ORDER], int *shift,
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enum FFLPCType lpc_type, int lpc_passes,
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int omethod, int max_shift, int zero_shift);
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/**
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* Initialize LPCContext.
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*/
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int ff_lpc_init(LPCContext *s, int blocksize, int max_order,
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enum FFLPCType lpc_type);
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void ff_lpc_init_x86(LPCContext *s);
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/**
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* Uninitialize LPCContext.
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*/
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void ff_lpc_end(LPCContext *s);
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#ifdef LPC_USE_DOUBLE
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#define LPC_TYPE double
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#else
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#define LPC_TYPE float
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#endif
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/**
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* Levinson-Durbin recursion.
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* Produce LPC coefficients from autocorrelation data.
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*/
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static inline int compute_lpc_coefs(const LPC_TYPE *autoc, int max_order,
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LPC_TYPE *lpc, int lpc_stride, int fail,
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int normalize)
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{
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int i, j;
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LPC_TYPE err;
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LPC_TYPE *lpc_last = lpc;
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if (normalize)
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err = *autoc++;
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if (fail && (autoc[max_order - 1] == 0 || err <= 0))
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return -1;
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for(i=0; i<max_order; i++) {
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LPC_TYPE r = -autoc[i];
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if (normalize) {
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for(j=0; j<i; j++)
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r -= lpc_last[j] * autoc[i-j-1];
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r /= err;
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err *= 1.0 - (r * r);
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}
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lpc[i] = r;
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for(j=0; j < (i+1)>>1; j++) {
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LPC_TYPE f = lpc_last[ j];
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LPC_TYPE b = lpc_last[i-1-j];
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lpc[ j] = f + r * b;
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lpc[i-1-j] = b + r * f;
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}
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if (fail && err < 0)
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return -1;
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lpc_last = lpc;
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lpc += lpc_stride;
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}
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return 0;
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}
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#endif /* AVCODEC_LPC_H */
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