mirror of
https://github.com/FFmpeg/FFmpeg.git
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Merge commit '0517c9e098092709397cc522c59fa63c83cc81be'
* commit '0517c9e098092709397cc522c59fa63c83cc81be': lavc: remove disabled FF_API_AVCODEC_RESAMPLE cruft Conflicts: libavcodec/Makefile libavcodec/avcodec.h libavcodec/resample.c libavcodec/resample2.c libavcodec/version.h Merged-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer
commit
d3edc65dd1
@ -27,8 +27,6 @@ OBJS = allcodecs.o \
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parser.o \
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raw.o \
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rawdec.o \
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resample.o \
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resample2.o \
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utils.o \
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# parts needed for many different codecs
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@ -4097,103 +4097,6 @@ int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
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* @}
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*/
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#if FF_API_AVCODEC_RESAMPLE
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/**
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* @defgroup lavc_resample Audio resampling
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* @ingroup libavc
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* @deprecated use libswresample instead
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*
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* @{
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*/
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struct ReSampleContext;
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struct AVResampleContext;
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typedef struct ReSampleContext ReSampleContext;
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/**
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* Initialize audio resampling context.
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*
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* @param output_channels number of output channels
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* @param input_channels number of input channels
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* @param output_rate output sample rate
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* @param input_rate input sample rate
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* @param sample_fmt_out requested output sample format
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* @param sample_fmt_in input sample format
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* @param filter_length length of each FIR filter in the filterbank relative to the cutoff frequency
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* @param log2_phase_count log2 of the number of entries in the polyphase filterbank
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* @param linear if 1 then the used FIR filter will be linearly interpolated
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between the 2 closest, if 0 the closest will be used
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* @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
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* @return allocated ReSampleContext, NULL if error occurred
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*/
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attribute_deprecated
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ReSampleContext *av_audio_resample_init(int output_channels, int input_channels,
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int output_rate, int input_rate,
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enum AVSampleFormat sample_fmt_out,
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enum AVSampleFormat sample_fmt_in,
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int filter_length, int log2_phase_count,
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int linear, double cutoff);
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attribute_deprecated
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int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
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/**
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* Free resample context.
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*
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* @param s a non-NULL pointer to a resample context previously
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* created with av_audio_resample_init()
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*/
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attribute_deprecated
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void audio_resample_close(ReSampleContext *s);
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/**
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* Initialize an audio resampler.
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* Note, if either rate is not an integer then simply scale both rates up so they are.
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* @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
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* @param log2_phase_count log2 of the number of entries in the polyphase filterbank
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* @param linear If 1 then the used FIR filter will be linearly interpolated
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between the 2 closest, if 0 the closest will be used
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* @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
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*/
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attribute_deprecated
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struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
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/**
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* Resample an array of samples using a previously configured context.
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* @param src an array of unconsumed samples
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* @param consumed the number of samples of src which have been consumed are returned here
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* @param src_size the number of unconsumed samples available
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* @param dst_size the amount of space in samples available in dst
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* @param update_ctx If this is 0 then the context will not be modified, that way several channels can be resampled with the same context.
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* @return the number of samples written in dst or -1 if an error occurred
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*/
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attribute_deprecated
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int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
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/**
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* Compensate samplerate/timestamp drift. The compensation is done by changing
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* the resampler parameters, so no audible clicks or similar distortions occur
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* @param compensation_distance distance in output samples over which the compensation should be performed
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* @param sample_delta number of output samples which should be output less
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*
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* example: av_resample_compensate(c, 10, 500)
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* here instead of 510 samples only 500 samples would be output
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*
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* note, due to rounding the actual compensation might be slightly different,
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* especially if the compensation_distance is large and the in_rate used during init is small
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*/
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attribute_deprecated
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void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
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attribute_deprecated
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void av_resample_close(struct AVResampleContext *c);
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/**
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* @}
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*/
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#endif
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/**
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* @addtogroup lavc_picture
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* @{
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@ -1,435 +0,0 @@
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/*
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* samplerate conversion for both audio and video
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* Copyright (c) 2000 Fabrice Bellard
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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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/**
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* @file
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* samplerate conversion for both audio and video
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*/
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#include <string.h>
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#include "avcodec.h"
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#include "audioconvert.h"
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#include "libavutil/opt.h"
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#include "libavutil/mem.h"
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#include "libavutil/samplefmt.h"
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#if FF_API_AVCODEC_RESAMPLE
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#define MAX_CHANNELS 8
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struct AVResampleContext;
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static const char *context_to_name(void *ptr)
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{
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return "audioresample";
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}
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static const AVOption options[] = {{NULL}};
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static const AVClass audioresample_context_class = {
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"ReSampleContext", context_to_name, options, LIBAVUTIL_VERSION_INT
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};
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struct ReSampleContext {
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struct AVResampleContext *resample_context;
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short *temp[MAX_CHANNELS];
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int temp_len;
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float ratio;
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/* channel convert */
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int input_channels, output_channels, filter_channels;
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AVAudioConvert *convert_ctx[2];
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enum AVSampleFormat sample_fmt[2]; ///< input and output sample format
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unsigned sample_size[2]; ///< size of one sample in sample_fmt
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short *buffer[2]; ///< buffers used for conversion to S16
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unsigned buffer_size[2]; ///< sizes of allocated buffers
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};
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/* n1: number of samples */
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static void stereo_to_mono(short *output, short *input, int n1)
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{
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short *p, *q;
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int n = n1;
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p = input;
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q = output;
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while (n >= 4) {
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q[0] = (p[0] + p[1]) >> 1;
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q[1] = (p[2] + p[3]) >> 1;
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q[2] = (p[4] + p[5]) >> 1;
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q[3] = (p[6] + p[7]) >> 1;
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q += 4;
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p += 8;
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n -= 4;
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}
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while (n > 0) {
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q[0] = (p[0] + p[1]) >> 1;
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q++;
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p += 2;
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n--;
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}
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}
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/* n1: number of samples */
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static void mono_to_stereo(short *output, short *input, int n1)
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{
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short *p, *q;
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int n = n1;
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int v;
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p = input;
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q = output;
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while (n >= 4) {
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v = p[0]; q[0] = v; q[1] = v;
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v = p[1]; q[2] = v; q[3] = v;
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v = p[2]; q[4] = v; q[5] = v;
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v = p[3]; q[6] = v; q[7] = v;
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q += 8;
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p += 4;
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n -= 4;
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}
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while (n > 0) {
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v = p[0]; q[0] = v; q[1] = v;
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q += 2;
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p += 1;
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n--;
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}
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}
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/*
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5.1 to stereo input: [fl, fr, c, lfe, rl, rr]
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- Left = front_left + rear_gain * rear_left + center_gain * center
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- Right = front_right + rear_gain * rear_right + center_gain * center
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Where rear_gain is usually around 0.5-1.0 and
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center_gain is almost always 0.7 (-3 dB)
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*/
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static void surround_to_stereo(short **output, short *input, int channels, int samples)
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{
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int i;
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short l, r;
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for (i = 0; i < samples; i++) {
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int fl,fr,c,rl,rr;
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fl = input[0];
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fr = input[1];
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c = input[2];
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// lfe = input[3];
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rl = input[4];
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rr = input[5];
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l = av_clip_int16(fl + (0.5 * rl) + (0.7 * c));
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r = av_clip_int16(fr + (0.5 * rr) + (0.7 * c));
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/* output l & r. */
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*output[0]++ = l;
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*output[1]++ = r;
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/* increment input. */
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input += channels;
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}
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}
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static void deinterleave(short **output, short *input, int channels, int samples)
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{
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int i, j;
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for (i = 0; i < samples; i++) {
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for (j = 0; j < channels; j++) {
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*output[j]++ = *input++;
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}
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}
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}
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static void interleave(short *output, short **input, int channels, int samples)
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{
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int i, j;
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for (i = 0; i < samples; i++) {
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for (j = 0; j < channels; j++) {
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*output++ = *input[j]++;
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}
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}
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}
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static void ac3_5p1_mux(short *output, short *input1, short *input2, int n)
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{
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int i;
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short l, r;
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for (i = 0; i < n; i++) {
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l = *input1++;
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r = *input2++;
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*output++ = l; /* left */
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*output++ = (l / 2) + (r / 2); /* center */
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*output++ = r; /* right */
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*output++ = 0; /* left surround */
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*output++ = 0; /* right surroud */
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*output++ = 0; /* low freq */
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}
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}
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#define SUPPORT_RESAMPLE(ch1, ch2, ch3, ch4, ch5, ch6, ch7, ch8) \
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ch8<<7 | ch7<<6 | ch6<<5 | ch5<<4 | ch4<<3 | ch3<<2 | ch2<<1 | ch1<<0
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static const uint8_t supported_resampling[MAX_CHANNELS] = {
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// output ch: 1 2 3 4 5 6 7 8
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SUPPORT_RESAMPLE(1, 1, 0, 0, 0, 0, 0, 0), // 1 input channel
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SUPPORT_RESAMPLE(1, 1, 0, 0, 0, 1, 0, 0), // 2 input channels
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SUPPORT_RESAMPLE(0, 0, 1, 0, 0, 0, 0, 0), // 3 input channels
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SUPPORT_RESAMPLE(0, 0, 0, 1, 0, 0, 0, 0), // 4 input channels
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SUPPORT_RESAMPLE(0, 0, 0, 0, 1, 0, 0, 0), // 5 input channels
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SUPPORT_RESAMPLE(0, 1, 0, 0, 0, 1, 0, 0), // 6 input channels
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SUPPORT_RESAMPLE(0, 0, 0, 0, 0, 0, 1, 0), // 7 input channels
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SUPPORT_RESAMPLE(0, 0, 0, 0, 0, 0, 0, 1), // 8 input channels
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};
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ReSampleContext *av_audio_resample_init(int output_channels, int input_channels,
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int output_rate, int input_rate,
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enum AVSampleFormat sample_fmt_out,
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enum AVSampleFormat sample_fmt_in,
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int filter_length, int log2_phase_count,
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int linear, double cutoff)
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{
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ReSampleContext *s;
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if (input_channels > MAX_CHANNELS) {
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av_log(NULL, AV_LOG_ERROR,
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"Resampling with input channels greater than %d is unsupported.\n",
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MAX_CHANNELS);
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return NULL;
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}
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if (!(supported_resampling[input_channels-1] & (1<<(output_channels-1)))) {
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int i;
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av_log(NULL, AV_LOG_ERROR, "Unsupported audio resampling. Allowed "
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"output channels for %d input channel%s", input_channels,
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input_channels > 1 ? "s:" : ":");
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for (i = 0; i < MAX_CHANNELS; i++)
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if (supported_resampling[input_channels-1] & (1<<i))
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av_log(NULL, AV_LOG_ERROR, " %d", i + 1);
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av_log(NULL, AV_LOG_ERROR, "\n");
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return NULL;
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}
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s = av_mallocz(sizeof(ReSampleContext));
|
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if (!s) {
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av_log(NULL, AV_LOG_ERROR, "Can't allocate memory for resample context.\n");
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return NULL;
|
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}
|
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s->ratio = (float)output_rate / (float)input_rate;
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|
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s->input_channels = input_channels;
|
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s->output_channels = output_channels;
|
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|
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s->filter_channels = s->input_channels;
|
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if (s->output_channels < s->filter_channels)
|
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s->filter_channels = s->output_channels;
|
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|
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s->sample_fmt[0] = sample_fmt_in;
|
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s->sample_fmt[1] = sample_fmt_out;
|
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s->sample_size[0] = av_get_bytes_per_sample(s->sample_fmt[0]);
|
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s->sample_size[1] = av_get_bytes_per_sample(s->sample_fmt[1]);
|
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|
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if (s->sample_fmt[0] != AV_SAMPLE_FMT_S16) {
|
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if (!(s->convert_ctx[0] = av_audio_convert_alloc(AV_SAMPLE_FMT_S16, 1,
|
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s->sample_fmt[0], 1, NULL, 0))) {
|
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av_log(s, AV_LOG_ERROR,
|
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"Cannot convert %s sample format to s16 sample format\n",
|
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av_get_sample_fmt_name(s->sample_fmt[0]));
|
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av_free(s);
|
||||
return NULL;
|
||||
}
|
||||
}
|
||||
|
||||
if (s->sample_fmt[1] != AV_SAMPLE_FMT_S16) {
|
||||
if (!(s->convert_ctx[1] = av_audio_convert_alloc(s->sample_fmt[1], 1,
|
||||
AV_SAMPLE_FMT_S16, 1, NULL, 0))) {
|
||||
av_log(s, AV_LOG_ERROR,
|
||||
"Cannot convert s16 sample format to %s sample format\n",
|
||||
av_get_sample_fmt_name(s->sample_fmt[1]));
|
||||
av_audio_convert_free(s->convert_ctx[0]);
|
||||
av_free(s);
|
||||
return NULL;
|
||||
}
|
||||
}
|
||||
|
||||
s->resample_context = av_resample_init(output_rate, input_rate,
|
||||
filter_length, log2_phase_count,
|
||||
linear, cutoff);
|
||||
|
||||
*(const AVClass**)s->resample_context = &audioresample_context_class;
|
||||
|
||||
return s;
|
||||
}
|
||||
|
||||
/* resample audio. 'nb_samples' is the number of input samples */
|
||||
/* XXX: optimize it ! */
|
||||
int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples)
|
||||
{
|
||||
int i, nb_samples1;
|
||||
short *bufin[MAX_CHANNELS];
|
||||
short *bufout[MAX_CHANNELS];
|
||||
short *buftmp2[MAX_CHANNELS], *buftmp3[MAX_CHANNELS];
|
||||
short *output_bak = NULL;
|
||||
int lenout;
|
||||
|
||||
if (s->input_channels == s->output_channels && s->ratio == 1.0 && 0) {
|
||||
/* nothing to do */
|
||||
memcpy(output, input, nb_samples * s->input_channels * sizeof(short));
|
||||
return nb_samples;
|
||||
}
|
||||
|
||||
if (s->sample_fmt[0] != AV_SAMPLE_FMT_S16) {
|
||||
int istride[1] = { s->sample_size[0] };
|
||||
int ostride[1] = { 2 };
|
||||
const void *ibuf[1] = { input };
|
||||
void *obuf[1];
|
||||
unsigned input_size = nb_samples * s->input_channels * 2;
|
||||
|
||||
if (!s->buffer_size[0] || s->buffer_size[0] < input_size) {
|
||||
av_free(s->buffer[0]);
|
||||
s->buffer_size[0] = input_size;
|
||||
s->buffer[0] = av_malloc(s->buffer_size[0]);
|
||||
if (!s->buffer[0]) {
|
||||
av_log(s->resample_context, AV_LOG_ERROR, "Could not allocate buffer\n");
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
|
||||
obuf[0] = s->buffer[0];
|
||||
|
||||
if (av_audio_convert(s->convert_ctx[0], obuf, ostride,
|
||||
ibuf, istride, nb_samples * s->input_channels) < 0) {
|
||||
av_log(s->resample_context, AV_LOG_ERROR,
|
||||
"Audio sample format conversion failed\n");
|
||||
return 0;
|
||||
}
|
||||
|
||||
input = s->buffer[0];
|
||||
}
|
||||
|
||||
lenout= 2*s->output_channels*nb_samples * s->ratio + 16;
|
||||
|
||||
if (s->sample_fmt[1] != AV_SAMPLE_FMT_S16) {
|
||||
int out_size = lenout * av_get_bytes_per_sample(s->sample_fmt[1]) *
|
||||
s->output_channels;
|
||||
output_bak = output;
|
||||
|
||||
if (!s->buffer_size[1] || s->buffer_size[1] < out_size) {
|
||||
av_free(s->buffer[1]);
|
||||
s->buffer_size[1] = out_size;
|
||||
s->buffer[1] = av_malloc(s->buffer_size[1]);
|
||||
if (!s->buffer[1]) {
|
||||
av_log(s->resample_context, AV_LOG_ERROR, "Could not allocate buffer\n");
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
|
||||
output = s->buffer[1];
|
||||
}
|
||||
|
||||
/* XXX: move those malloc to resample init code */
|
||||
for (i = 0; i < s->filter_channels; i++) {
|
||||
bufin[i] = av_malloc((nb_samples + s->temp_len) * sizeof(short));
|
||||
memcpy(bufin[i], s->temp[i], s->temp_len * sizeof(short));
|
||||
buftmp2[i] = bufin[i] + s->temp_len;
|
||||
bufout[i] = av_malloc(lenout * sizeof(short));
|
||||
}
|
||||
|
||||
if (s->input_channels == 2 && s->output_channels == 1) {
|
||||
buftmp3[0] = output;
|
||||
stereo_to_mono(buftmp2[0], input, nb_samples);
|
||||
} else if (s->output_channels >= 2 && s->input_channels == 1) {
|
||||
buftmp3[0] = bufout[0];
|
||||
memcpy(buftmp2[0], input, nb_samples * sizeof(short));
|
||||
} else if (s->input_channels == 6 && s->output_channels ==2) {
|
||||
buftmp3[0] = bufout[0];
|
||||
buftmp3[1] = bufout[1];
|
||||
surround_to_stereo(buftmp2, input, s->input_channels, nb_samples);
|
||||
} else if (s->output_channels >= s->input_channels && s->input_channels >= 2) {
|
||||
for (i = 0; i < s->input_channels; i++) {
|
||||
buftmp3[i] = bufout[i];
|
||||
}
|
||||
deinterleave(buftmp2, input, s->input_channels, nb_samples);
|
||||
} else {
|
||||
buftmp3[0] = output;
|
||||
memcpy(buftmp2[0], input, nb_samples * sizeof(short));
|
||||
}
|
||||
|
||||
nb_samples += s->temp_len;
|
||||
|
||||
/* resample each channel */
|
||||
nb_samples1 = 0; /* avoid warning */
|
||||
for (i = 0; i < s->filter_channels; i++) {
|
||||
int consumed;
|
||||
int is_last = i + 1 == s->filter_channels;
|
||||
|
||||
nb_samples1 = av_resample(s->resample_context, buftmp3[i], bufin[i],
|
||||
&consumed, nb_samples, lenout, is_last);
|
||||
s->temp_len = nb_samples - consumed;
|
||||
s->temp[i] = av_realloc(s->temp[i], s->temp_len * sizeof(short));
|
||||
memcpy(s->temp[i], bufin[i] + consumed, s->temp_len * sizeof(short));
|
||||
}
|
||||
|
||||
if (s->output_channels == 2 && s->input_channels == 1) {
|
||||
mono_to_stereo(output, buftmp3[0], nb_samples1);
|
||||
} else if (s->output_channels == 6 && s->input_channels == 2) {
|
||||
ac3_5p1_mux(output, buftmp3[0], buftmp3[1], nb_samples1);
|
||||
} else if ((s->output_channels == s->input_channels && s->input_channels >= 2) ||
|
||||
(s->output_channels == 2 && s->input_channels == 6)) {
|
||||
interleave(output, buftmp3, s->output_channels, nb_samples1);
|
||||
}
|
||||
|
||||
if (s->sample_fmt[1] != AV_SAMPLE_FMT_S16) {
|
||||
int istride[1] = { 2 };
|
||||
int ostride[1] = { s->sample_size[1] };
|
||||
const void *ibuf[1] = { output };
|
||||
void *obuf[1] = { output_bak };
|
||||
|
||||
if (av_audio_convert(s->convert_ctx[1], obuf, ostride,
|
||||
ibuf, istride, nb_samples1 * s->output_channels) < 0) {
|
||||
av_log(s->resample_context, AV_LOG_ERROR,
|
||||
"Audio sample format conversion failed\n");
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
|
||||
for (i = 0; i < s->filter_channels; i++) {
|
||||
av_free(bufin[i]);
|
||||
av_free(bufout[i]);
|
||||
}
|
||||
|
||||
return nb_samples1;
|
||||
}
|
||||
|
||||
void audio_resample_close(ReSampleContext *s)
|
||||
{
|
||||
int i;
|
||||
av_resample_close(s->resample_context);
|
||||
for (i = 0; i < s->filter_channels; i++)
|
||||
av_freep(&s->temp[i]);
|
||||
av_freep(&s->buffer[0]);
|
||||
av_freep(&s->buffer[1]);
|
||||
av_audio_convert_free(s->convert_ctx[0]);
|
||||
av_audio_convert_free(s->convert_ctx[1]);
|
||||
av_free(s);
|
||||
}
|
||||
|
||||
#endif
|
||||
@ -1,319 +0,0 @@
|
||||
/*
|
||||
* audio resampling
|
||||
* Copyright (c) 2004 Michael Niedermayer <michaelni@gmx.at>
|
||||
*
|
||||
* 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
|
||||
* audio resampling
|
||||
* @author Michael Niedermayer <michaelni@gmx.at>
|
||||
*/
|
||||
|
||||
#include "libavutil/avassert.h"
|
||||
#include "avcodec.h"
|
||||
#include "libavutil/common.h"
|
||||
|
||||
#if FF_API_AVCODEC_RESAMPLE
|
||||
|
||||
#ifndef CONFIG_RESAMPLE_HP
|
||||
#define FILTER_SHIFT 15
|
||||
|
||||
#define FELEM int16_t
|
||||
#define FELEM2 int32_t
|
||||
#define FELEML int64_t
|
||||
#define FELEM_MAX INT16_MAX
|
||||
#define FELEM_MIN INT16_MIN
|
||||
#define WINDOW_TYPE 9
|
||||
#elif !defined(CONFIG_RESAMPLE_AUDIOPHILE_KIDDY_MODE)
|
||||
#define FILTER_SHIFT 30
|
||||
|
||||
#define FELEM int32_t
|
||||
#define FELEM2 int64_t
|
||||
#define FELEML int64_t
|
||||
#define FELEM_MAX INT32_MAX
|
||||
#define FELEM_MIN INT32_MIN
|
||||
#define WINDOW_TYPE 12
|
||||
#else
|
||||
#define FILTER_SHIFT 0
|
||||
|
||||
#define FELEM double
|
||||
#define FELEM2 double
|
||||
#define FELEML double
|
||||
#define WINDOW_TYPE 24
|
||||
#endif
|
||||
|
||||
|
||||
typedef struct AVResampleContext{
|
||||
const AVClass *av_class;
|
||||
FELEM *filter_bank;
|
||||
int filter_length;
|
||||
int ideal_dst_incr;
|
||||
int dst_incr;
|
||||
int index;
|
||||
int frac;
|
||||
int src_incr;
|
||||
int compensation_distance;
|
||||
int phase_shift;
|
||||
int phase_mask;
|
||||
int linear;
|
||||
}AVResampleContext;
|
||||
|
||||
/**
|
||||
* 0th order modified bessel function of the first kind.
|
||||
*/
|
||||
static double bessel(double x){
|
||||
double v=1;
|
||||
double lastv=0;
|
||||
double t=1;
|
||||
int i;
|
||||
|
||||
x= x*x/4;
|
||||
for(i=1; v != lastv; i++){
|
||||
lastv=v;
|
||||
t *= x/(i*i);
|
||||
v += t;
|
||||
}
|
||||
return v;
|
||||
}
|
||||
|
||||
/**
|
||||
* Build a polyphase filterbank.
|
||||
* @param factor resampling factor
|
||||
* @param scale wanted sum of coefficients for each filter
|
||||
* @param type 0->cubic, 1->blackman nuttall windowed sinc, 2..16->kaiser windowed sinc beta=2..16
|
||||
* @return 0 on success, negative on error
|
||||
*/
|
||||
static int build_filter(FELEM *filter, double factor, int tap_count, int phase_count, int scale, int type){
|
||||
int ph, i;
|
||||
double x, y, w;
|
||||
double *tab = av_malloc(tap_count * sizeof(*tab));
|
||||
const int center= (tap_count-1)/2;
|
||||
|
||||
if (!tab)
|
||||
return AVERROR(ENOMEM);
|
||||
|
||||
/* if upsampling, only need to interpolate, no filter */
|
||||
if (factor > 1.0)
|
||||
factor = 1.0;
|
||||
|
||||
for(ph=0;ph<phase_count;ph++) {
|
||||
double norm = 0;
|
||||
for(i=0;i<tap_count;i++) {
|
||||
x = M_PI * ((double)(i - center) - (double)ph / phase_count) * factor;
|
||||
if (x == 0) y = 1.0;
|
||||
else y = sin(x) / x;
|
||||
switch(type){
|
||||
case 0:{
|
||||
const float d= -0.5; //first order derivative = -0.5
|
||||
x = fabs(((double)(i - center) - (double)ph / phase_count) * factor);
|
||||
if(x<1.0) y= 1 - 3*x*x + 2*x*x*x + d*( -x*x + x*x*x);
|
||||
else y= d*(-4 + 8*x - 5*x*x + x*x*x);
|
||||
break;}
|
||||
case 1:
|
||||
w = 2.0*x / (factor*tap_count) + M_PI;
|
||||
y *= 0.3635819 - 0.4891775 * cos(w) + 0.1365995 * cos(2*w) - 0.0106411 * cos(3*w);
|
||||
break;
|
||||
default:
|
||||
w = 2.0*x / (factor*tap_count*M_PI);
|
||||
y *= bessel(type*sqrt(FFMAX(1-w*w, 0)));
|
||||
break;
|
||||
}
|
||||
|
||||
tab[i] = y;
|
||||
norm += y;
|
||||
}
|
||||
|
||||
/* normalize so that an uniform color remains the same */
|
||||
for(i=0;i<tap_count;i++) {
|
||||
#ifdef CONFIG_RESAMPLE_AUDIOPHILE_KIDDY_MODE
|
||||
filter[ph * tap_count + i] = tab[i] / norm;
|
||||
#else
|
||||
filter[ph * tap_count + i] = av_clip(lrintf(tab[i] * scale / norm), FELEM_MIN, FELEM_MAX);
|
||||
#endif
|
||||
}
|
||||
}
|
||||
#if 0
|
||||
{
|
||||
#define LEN 1024
|
||||
int j,k;
|
||||
double sine[LEN + tap_count];
|
||||
double filtered[LEN];
|
||||
double maxff=-2, minff=2, maxsf=-2, minsf=2;
|
||||
for(i=0; i<LEN; i++){
|
||||
double ss=0, sf=0, ff=0;
|
||||
for(j=0; j<LEN+tap_count; j++)
|
||||
sine[j]= cos(i*j*M_PI/LEN);
|
||||
for(j=0; j<LEN; j++){
|
||||
double sum=0;
|
||||
ph=0;
|
||||
for(k=0; k<tap_count; k++)
|
||||
sum += filter[ph * tap_count + k] * sine[k+j];
|
||||
filtered[j]= sum / (1<<FILTER_SHIFT);
|
||||
ss+= sine[j + center] * sine[j + center];
|
||||
ff+= filtered[j] * filtered[j];
|
||||
sf+= sine[j + center] * filtered[j];
|
||||
}
|
||||
ss= sqrt(2*ss/LEN);
|
||||
ff= sqrt(2*ff/LEN);
|
||||
sf= 2*sf/LEN;
|
||||
maxff= FFMAX(maxff, ff);
|
||||
minff= FFMIN(minff, ff);
|
||||
maxsf= FFMAX(maxsf, sf);
|
||||
minsf= FFMIN(minsf, sf);
|
||||
if(i%11==0){
|
||||
av_log(NULL, AV_LOG_ERROR, "i:%4d ss:%f ff:%13.6e-%13.6e sf:%13.6e-%13.6e\n", i, ss, maxff, minff, maxsf, minsf);
|
||||
minff=minsf= 2;
|
||||
maxff=maxsf= -2;
|
||||
}
|
||||
}
|
||||
}
|
||||
#endif
|
||||
|
||||
av_free(tab);
|
||||
return 0;
|
||||
}
|
||||
|
||||
AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_size, int phase_shift, int linear, double cutoff){
|
||||
AVResampleContext *c= av_mallocz(sizeof(AVResampleContext));
|
||||
double factor= FFMIN(out_rate * cutoff / in_rate, 1.0);
|
||||
int phase_count= 1<<phase_shift;
|
||||
|
||||
if (!c)
|
||||
return NULL;
|
||||
|
||||
c->phase_shift= phase_shift;
|
||||
c->phase_mask= phase_count-1;
|
||||
c->linear= linear;
|
||||
|
||||
c->filter_length= FFMAX((int)ceil(filter_size/factor), 1);
|
||||
c->filter_bank= av_mallocz(c->filter_length*(phase_count+1)*sizeof(FELEM));
|
||||
if (!c->filter_bank)
|
||||
goto error;
|
||||
if (build_filter(c->filter_bank, factor, c->filter_length, phase_count, 1<<FILTER_SHIFT, WINDOW_TYPE))
|
||||
goto error;
|
||||
memcpy(&c->filter_bank[c->filter_length*phase_count+1], c->filter_bank, (c->filter_length-1)*sizeof(FELEM));
|
||||
c->filter_bank[c->filter_length*phase_count]= c->filter_bank[c->filter_length - 1];
|
||||
|
||||
if(!av_reduce(&c->src_incr, &c->dst_incr, out_rate, in_rate * (int64_t)phase_count, INT32_MAX/2))
|
||||
goto error;
|
||||
c->ideal_dst_incr= c->dst_incr;
|
||||
|
||||
c->index= -phase_count*((c->filter_length-1)/2);
|
||||
|
||||
return c;
|
||||
error:
|
||||
av_free(c->filter_bank);
|
||||
av_free(c);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
void av_resample_close(AVResampleContext *c){
|
||||
av_freep(&c->filter_bank);
|
||||
av_freep(&c);
|
||||
}
|
||||
|
||||
void av_resample_compensate(AVResampleContext *c, int sample_delta, int compensation_distance){
|
||||
// sample_delta += (c->ideal_dst_incr - c->dst_incr)*(int64_t)c->compensation_distance / c->ideal_dst_incr;
|
||||
c->compensation_distance= compensation_distance;
|
||||
c->dst_incr = c->ideal_dst_incr - c->ideal_dst_incr * (int64_t)sample_delta / compensation_distance;
|
||||
}
|
||||
|
||||
int av_resample(AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx){
|
||||
int dst_index, i;
|
||||
int index= c->index;
|
||||
int frac= c->frac;
|
||||
int dst_incr_frac= c->dst_incr % c->src_incr;
|
||||
int dst_incr= c->dst_incr / c->src_incr;
|
||||
int compensation_distance= c->compensation_distance;
|
||||
|
||||
if(compensation_distance == 0 && c->filter_length == 1 && c->phase_shift==0){
|
||||
int64_t index2= ((int64_t)index)<<32;
|
||||
int64_t incr= (1LL<<32) * c->dst_incr / c->src_incr;
|
||||
dst_size= FFMIN(dst_size, (src_size-1-index) * (int64_t)c->src_incr / c->dst_incr);
|
||||
|
||||
for(dst_index=0; dst_index < dst_size; dst_index++){
|
||||
dst[dst_index] = src[index2>>32];
|
||||
index2 += incr;
|
||||
}
|
||||
index += dst_index * dst_incr;
|
||||
index += (frac + dst_index * (int64_t)dst_incr_frac) / c->src_incr;
|
||||
frac = (frac + dst_index * (int64_t)dst_incr_frac) % c->src_incr;
|
||||
}else{
|
||||
for(dst_index=0; dst_index < dst_size; dst_index++){
|
||||
FELEM *filter= c->filter_bank + c->filter_length*(index & c->phase_mask);
|
||||
int sample_index= index >> c->phase_shift;
|
||||
FELEM2 val=0;
|
||||
|
||||
if(sample_index < 0){
|
||||
for(i=0; i<c->filter_length; i++)
|
||||
val += src[FFABS(sample_index + i) % src_size] * filter[i];
|
||||
}else if(sample_index + c->filter_length > src_size){
|
||||
break;
|
||||
}else if(c->linear){
|
||||
FELEM2 v2=0;
|
||||
for(i=0; i<c->filter_length; i++){
|
||||
val += src[sample_index + i] * (FELEM2)filter[i];
|
||||
v2 += src[sample_index + i] * (FELEM2)filter[i + c->filter_length];
|
||||
}
|
||||
val+=(v2-val)*(FELEML)frac / c->src_incr;
|
||||
}else{
|
||||
for(i=0; i<c->filter_length; i++){
|
||||
val += src[sample_index + i] * (FELEM2)filter[i];
|
||||
}
|
||||
}
|
||||
|
||||
#ifdef CONFIG_RESAMPLE_AUDIOPHILE_KIDDY_MODE
|
||||
dst[dst_index] = av_clip_int16(lrintf(val));
|
||||
#else
|
||||
val = (val + (1<<(FILTER_SHIFT-1)))>>FILTER_SHIFT;
|
||||
dst[dst_index] = (unsigned)(val + 32768) > 65535 ? (val>>31) ^ 32767 : val;
|
||||
#endif
|
||||
|
||||
frac += dst_incr_frac;
|
||||
index += dst_incr;
|
||||
if(frac >= c->src_incr){
|
||||
frac -= c->src_incr;
|
||||
index++;
|
||||
}
|
||||
|
||||
if(dst_index + 1 == compensation_distance){
|
||||
compensation_distance= 0;
|
||||
dst_incr_frac= c->ideal_dst_incr % c->src_incr;
|
||||
dst_incr= c->ideal_dst_incr / c->src_incr;
|
||||
}
|
||||
}
|
||||
}
|
||||
*consumed= FFMAX(index, 0) >> c->phase_shift;
|
||||
if(index>=0) index &= c->phase_mask;
|
||||
|
||||
if(compensation_distance){
|
||||
compensation_distance -= dst_index;
|
||||
av_assert2(compensation_distance > 0);
|
||||
}
|
||||
if(update_ctx){
|
||||
c->frac= frac;
|
||||
c->index= index;
|
||||
c->dst_incr= dst_incr_frac + c->src_incr*dst_incr;
|
||||
c->compensation_distance= compensation_distance;
|
||||
}
|
||||
|
||||
return dst_index;
|
||||
}
|
||||
|
||||
#endif
|
||||
@ -73,9 +73,6 @@
|
||||
#ifndef FF_API_CODEC_ID
|
||||
#define FF_API_CODEC_ID (LIBAVCODEC_VERSION_MAJOR < 56)
|
||||
#endif
|
||||
#ifndef FF_API_AVCODEC_RESAMPLE
|
||||
#define FF_API_AVCODEC_RESAMPLE (LIBAVCODEC_VERSION_MAJOR < 55)
|
||||
#endif
|
||||
#ifndef FF_API_LIBMPEG2
|
||||
#define FF_API_LIBMPEG2 (LIBAVCODEC_VERSION_MAJOR < 55)
|
||||
#endif
|
||||
|
||||
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Reference in New Issue
Block a user