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lavr: add option for dithering during sample format conversion to s16

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This commit is contained in:
Justin Ruggles 2012-10-31 15:40:12 -04:00
parent 5823686261
commit b2fe6756e3
10 changed files with 583 additions and 12 deletions
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1
libavresample/Makefile
View File

@ -8,6 +8,7 @@ OBJS = audio_convert.o \
audio_data.o \
audio_mix.o \
audio_mix_matrix.o \
dither.o \
options.o \
resample.o \
utils.o \

33
libavresample/audio_convert.c
View File

@ -29,6 +29,8 @@
#include "libavutil/samplefmt.h"
#include "audio_convert.h"
#include "audio_data.h"
#include "dither.h"
#include "internal.h"
enum ConvFuncType {
CONV_FUNC_TYPE_FLAT,
@ -46,6 +48,7 @@ typedef void (conv_func_deinterleave)(uint8_t **out, const uint8_t *in, int len,
struct AudioConvert {
AVAudioResampleContext *avr;
DitherContext *dc;
enum AVSampleFormat in_fmt;
enum AVSampleFormat out_fmt;
int channels;
@ -246,10 +249,18 @@ static void set_generic_function(AudioConvert *ac)
SET_CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, AV_SAMPLE_FMT_DBL)
}
void ff_audio_convert_free(AudioConvert **ac)
{
if (!*ac)
return;
ff_dither_free(&(*ac)->dc);
av_freep(ac);
}
AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr,
enum AVSampleFormat out_fmt,
enum AVSampleFormat in_fmt,
int channels)
int channels, int sample_rate)
{
AudioConvert *ac;
int in_planar, out_planar;
@ -263,6 +274,17 @@ AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr,
ac->in_fmt = in_fmt;
ac->channels = channels;
if (avr->dither_method != AV_RESAMPLE_DITHER_NONE &&
av_get_packed_sample_fmt(out_fmt) == AV_SAMPLE_FMT_S16 &&
av_get_bytes_per_sample(in_fmt) > 2) {
ac->dc = ff_dither_alloc(avr, out_fmt, in_fmt, channels, sample_rate);
if (!ac->dc) {
av_free(ac);
return NULL;
}
return ac;
}
in_planar = av_sample_fmt_is_planar(in_fmt);
out_planar = av_sample_fmt_is_planar(out_fmt);
@ -289,6 +311,15 @@ int ff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in)
int use_generic = 1;
int len = in->nb_samples;
if (ac->dc) {
/* dithered conversion */
av_dlog(ac->avr, "%d samples - audio_convert: %s to %s (dithered)\n",
len, av_get_sample_fmt_name(ac->in_fmt),
av_get_sample_fmt_name(ac->out_fmt));
return ff_convert_dither(ac->dc, out, in);
}
/* determine whether to use the optimized function based on pointer and
samples alignment in both the input and output */
if (ac->has_optimized_func) {

12
libavresample/audio_convert.h
View File

@ -58,12 +58,22 @@ void ff_audio_convert_set_func(AudioConvert *ac, enum AVSampleFormat out_fmt,
* @param out_fmt output sample format
* @param in_fmt input sample format
* @param channels number of channels
* @param sample_rate sample rate (used for dithering)
* @return newly-allocated AudioConvert context
*/
AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr,
enum AVSampleFormat out_fmt,
enum AVSampleFormat in_fmt,
int channels);
int channels, int sample_rate);
/**
* Free AudioConvert.
*
* The AudioConvert must have been previously allocated with ff_audio_convert_alloc().
*
* @param ac AudioConvert struct
*/
void ff_audio_convert_free(AudioConvert **ac);
/**
* Convert audio data from one sample format to another.

9
libavresample/avresample.h
View File

@ -119,6 +119,15 @@ enum AVResampleFilterType {
AV_RESAMPLE_FILTER_TYPE_KAISER, /**< Kaiser Windowed Sinc */
};
enum AVResampleDitherMethod {
AV_RESAMPLE_DITHER_NONE, /**< Do not use dithering */
AV_RESAMPLE_DITHER_RECTANGULAR, /**< Rectangular Dither */
AV_RESAMPLE_DITHER_TRIANGULAR, /**< Triangular Dither*/
AV_RESAMPLE_DITHER_TRIANGULAR_HP, /**< Triangular Dither with High Pass */
AV_RESAMPLE_DITHER_TRIANGULAR_NS, /**< Triangular Dither with Noise Shaping */
AV_RESAMPLE_DITHER_NB, /**< Number of dither types. Not part of ABI. */
};
/**
* Return the LIBAVRESAMPLE_VERSION_INT constant.
*/

423
libavresample/dither.c Normal file
View File

@ -0,0 +1,423 @@
/*
* Copyright (c) 2012 Justin Ruggles <justin.ruggles@gmail.com>
*
* Triangular with Noise Shaping is based on opusfile.
* Copyright (c) 1994-2012 by the Xiph.Org Foundation and contributors
*
* 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
*/
/**
* @file
* Dithered Audio Sample Quantization
*
* Converts from dbl, flt, or s32 to s16 using dithering.
*/
#include <math.h>
#include <stdint.h>
#include "libavutil/common.h"
#include "libavutil/lfg.h"
#include "libavutil/mem.h"
#include "libavutil/samplefmt.h"
#include "audio_convert.h"
#include "dither.h"
#include "internal.h"
typedef struct DitherState {
int mute;
unsigned int seed;
AVLFG lfg;
float *noise_buf;
int noise_buf_size;
int noise_buf_ptr;
float dither_a[4];
float dither_b[4];
} DitherState;
struct DitherContext {
DitherDSPContext ddsp;
enum AVResampleDitherMethod method;
int mute_dither_threshold; // threshold for disabling dither
int mute_reset_threshold; // threshold for resetting noise shaping
const float *ns_coef_b; // noise shaping coeffs
const float *ns_coef_a; // noise shaping coeffs
int channels;
DitherState *state; // dither states for each channel
AudioData *flt_data; // input data in fltp
AudioData *s16_data; // dithered output in s16p
AudioConvert *ac_in; // converter for input to fltp
AudioConvert *ac_out; // converter for s16p to s16 (if needed)
void (*quantize)(int16_t *dst, const float *src, float *dither, int len);
int samples_align;
};
/* mute threshold, in seconds */
#define MUTE_THRESHOLD_SEC 0.000333
/* scale factor for 16-bit output.
The signal is attenuated slightly to avoid clipping */
#define S16_SCALE 32753.0f
/* scale to convert lfg from INT_MIN/INT_MAX to -0.5/0.5 */
#define LFG_SCALE (1.0f / (2.0f * INT32_MAX))
/* noise shaping coefficients */
static const float ns_48_coef_b[4] = {
2.2374f, -0.7339f, -0.1251f, -0.6033f
};
static const float ns_48_coef_a[4] = {
0.9030f, 0.0116f, -0.5853f, -0.2571f
};
static const float ns_44_coef_b[4] = {
2.2061f, -0.4707f, -0.2534f, -0.6213f
};
static const float ns_44_coef_a[4] = {
1.0587f, 0.0676f, -0.6054f, -0.2738f
};
static void dither_int_to_float_rectangular_c(float *dst, int *src, int len)
{
int i;
for (i = 0; i < len; i++)
dst[i] = src[i] * LFG_SCALE;
}
static void dither_int_to_float_triangular_c(float *dst, int *src0, int len)
{
int i;
int *src1 = src0 + len;
for (i = 0; i < len; i++) {
float r = src0[i] * LFG_SCALE;
r += src1[i] * LFG_SCALE;
dst[i] = r;
}
}
static void quantize_c(int16_t *dst, const float *src, float *dither, int len)
{
int i;
for (i = 0; i < len; i++)
dst[i] = av_clip_int16(lrintf(src[i] * S16_SCALE + dither[i]));
}
#define SQRT_1_6 0.40824829046386301723f
static void dither_highpass_filter(float *src, int len)
{
int i;
/* filter is from libswresample in FFmpeg */
for (i = 0; i < len - 2; i++)
src[i] = (-src[i] + 2 * src[i + 1] - src[i + 2]) * SQRT_1_6;
}
static int generate_dither_noise(DitherContext *c, DitherState *state,
int min_samples)
{
int i;
int nb_samples = FFALIGN(min_samples, 16) + 16;
int buf_samples = nb_samples *
(c->method == AV_RESAMPLE_DITHER_RECTANGULAR ? 1 : 2);
unsigned int *noise_buf_ui;
av_freep(&state->noise_buf);
state->noise_buf_size = state->noise_buf_ptr = 0;
state->noise_buf = av_malloc(buf_samples * sizeof(*state->noise_buf));
if (!state->noise_buf)
return AVERROR(ENOMEM);
state->noise_buf_size = FFALIGN(min_samples, 16);
noise_buf_ui = (unsigned int *)state->noise_buf;
av_lfg_init(&state->lfg, state->seed);
for (i = 0; i < buf_samples; i++)
noise_buf_ui[i] = av_lfg_get(&state->lfg);
c->ddsp.dither_int_to_float(state->noise_buf, noise_buf_ui, nb_samples);
if (c->method == AV_RESAMPLE_DITHER_TRIANGULAR_HP)
dither_highpass_filter(state->noise_buf, nb_samples);
return 0;
}
static void quantize_triangular_ns(DitherContext *c, DitherState *state,
int16_t *dst, const float *src,
int nb_samples)
{
int i, j;
float *dither = &state->noise_buf[state->noise_buf_ptr];
if (state->mute > c->mute_reset_threshold)
memset(state->dither_a, 0, sizeof(state->dither_a));
for (i = 0; i < nb_samples; i++) {
float err = 0;
float sample = src[i] * S16_SCALE;
for (j = 0; j < 4; j++) {
err += c->ns_coef_b[j] * state->dither_b[j] -
c->ns_coef_a[j] * state->dither_a[j];
}
for (j = 3; j > 0; j--) {
state->dither_a[j] = state->dither_a[j - 1];
state->dither_b[j] = state->dither_b[j - 1];
}
state->dither_a[0] = err;
sample -= err;
if (state->mute > c->mute_dither_threshold) {
dst[i] = av_clip_int16(lrintf(sample));
state->dither_b[0] = 0;
} else {
dst[i] = av_clip_int16(lrintf(sample + dither[i]));
state->dither_b[0] = av_clipf(dst[i] - sample, -1.5f, 1.5f);
}
state->mute++;
if (src[i])
state->mute = 0;
}
}
static int convert_samples(DitherContext *c, int16_t **dst, float * const *src,
int channels, int nb_samples)
{
int ch, ret;
int aligned_samples = FFALIGN(nb_samples, 16);
for (ch = 0; ch < channels; ch++) {
DitherState *state = &c->state[ch];
if (state->noise_buf_size < aligned_samples) {
ret = generate_dither_noise(c, state, nb_samples);
if (ret < 0)
return ret;
} else if (state->noise_buf_size - state->noise_buf_ptr < aligned_samples) {
state->noise_buf_ptr = 0;
}
if (c->method == AV_RESAMPLE_DITHER_TRIANGULAR_NS) {
quantize_triangular_ns(c, state, dst[ch], src[ch], nb_samples);
} else {
c->quantize(dst[ch], src[ch],
&state->noise_buf[state->noise_buf_ptr],
FFALIGN(nb_samples, c->samples_align));
}
state->noise_buf_ptr += aligned_samples;
}
return 0;
}
int ff_convert_dither(DitherContext *c, AudioData *dst, AudioData *src)
{
int ret;
AudioData *flt_data;
/* output directly to dst if it is planar */
if (dst->sample_fmt == AV_SAMPLE_FMT_S16P)
c->s16_data = dst;
else {
/* make sure s16_data is large enough for the output */
ret = ff_audio_data_realloc(c->s16_data, src->nb_samples);
if (ret < 0)
return ret;
}
if (src->sample_fmt != AV_SAMPLE_FMT_FLTP) {
/* make sure flt_data is large enough for the input */
ret = ff_audio_data_realloc(c->flt_data, src->nb_samples);
if (ret < 0)
return ret;
flt_data = c->flt_data;
/* convert input samples to fltp and scale to s16 range */
ret = ff_audio_convert(c->ac_in, flt_data, src);
if (ret < 0)
return ret;
} else {
flt_data = src;
}
/* check alignment and padding constraints */
if (c->method != AV_RESAMPLE_DITHER_TRIANGULAR_NS) {
int ptr_align = FFMIN(flt_data->ptr_align, c->s16_data->ptr_align);
int samples_align = FFMIN(flt_data->samples_align, c->s16_data->samples_align);
int aligned_len = FFALIGN(src->nb_samples, c->ddsp.samples_align);
if (!(ptr_align % c->ddsp.ptr_align) && samples_align >= aligned_len) {
c->quantize = c->ddsp.quantize;
c->samples_align = c->ddsp.samples_align;
} else {
c->quantize = quantize_c;
c->samples_align = 1;
}
}
ret = convert_samples(c, (int16_t **)c->s16_data->data,
(float * const *)flt_data->data, src->channels,
src->nb_samples);
if (ret < 0)
return ret;
c->s16_data->nb_samples = src->nb_samples;
/* interleave output to dst if needed */
if (dst->sample_fmt == AV_SAMPLE_FMT_S16) {
ret = ff_audio_convert(c->ac_out, dst, c->s16_data);
if (ret < 0)
return ret;
} else
c->s16_data = NULL;
return 0;
}
void ff_dither_free(DitherContext **cp)
{
DitherContext *c = *cp;
int ch;
if (!c)
return;
ff_audio_data_free(&c->flt_data);
ff_audio_data_free(&c->s16_data);
ff_audio_convert_free(&c->ac_in);
ff_audio_convert_free(&c->ac_out);
for (ch = 0; ch < c->channels; ch++)
av_free(c->state[ch].noise_buf);
av_free(c->state);
av_freep(cp);
}
static void dither_init(DitherDSPContext *ddsp,
enum AVResampleDitherMethod method)
{
ddsp->quantize = quantize_c;
ddsp->ptr_align = 1;
ddsp->samples_align = 1;
if (method == AV_RESAMPLE_DITHER_RECTANGULAR)
ddsp->dither_int_to_float = dither_int_to_float_rectangular_c;
else
ddsp->dither_int_to_float = dither_int_to_float_triangular_c;
}
DitherContext *ff_dither_alloc(AVAudioResampleContext *avr,
enum AVSampleFormat out_fmt,
enum AVSampleFormat in_fmt,
int channels, int sample_rate)
{
AVLFG seed_gen;
DitherContext *c;
int ch;
if (av_get_packed_sample_fmt(out_fmt) != AV_SAMPLE_FMT_S16 ||
av_get_bytes_per_sample(in_fmt) <= 2) {
av_log(avr, AV_LOG_ERROR, "dithering %s to %s is not supported\n",
av_get_sample_fmt_name(in_fmt), av_get_sample_fmt_name(out_fmt));
return NULL;
}
c = av_mallocz(sizeof(*c));
if (!c)
return NULL;
if (avr->dither_method == AV_RESAMPLE_DITHER_TRIANGULAR_NS &&
sample_rate != 48000 && sample_rate != 44100) {
av_log(avr, AV_LOG_WARNING, "sample rate must be 48000 or 44100 Hz "
"for triangular_ns dither. using triangular_hp instead.\n");
avr->dither_method = AV_RESAMPLE_DITHER_TRIANGULAR_HP;
}
c->method = avr->dither_method;
dither_init(&c->ddsp, c->method);
if (c->method == AV_RESAMPLE_DITHER_TRIANGULAR_NS) {
if (sample_rate == 48000) {
c->ns_coef_b = ns_48_coef_b;
c->ns_coef_a = ns_48_coef_a;
} else {
c->ns_coef_b = ns_44_coef_b;
c->ns_coef_a = ns_44_coef_a;
}
}
/* Either s16 or s16p output format is allowed, but s16p is used
internally, so we need to use a temp buffer and interleave if the output
format is s16 */
if (out_fmt != AV_SAMPLE_FMT_S16P) {
c->s16_data = ff_audio_data_alloc(channels, 1024, AV_SAMPLE_FMT_S16P,
"dither s16 buffer");
if (!c->s16_data)
goto fail;
c->ac_out = ff_audio_convert_alloc(avr, out_fmt, AV_SAMPLE_FMT_S16P,
channels, sample_rate);
if (!c->ac_out)
goto fail;
}
if (in_fmt != AV_SAMPLE_FMT_FLTP) {
c->flt_data = ff_audio_data_alloc(channels, 1024, AV_SAMPLE_FMT_FLTP,
"dither flt buffer");
if (!c->flt_data)
goto fail;
c->ac_in = ff_audio_convert_alloc(avr, AV_SAMPLE_FMT_FLTP, in_fmt,
channels, sample_rate);
if (!c->ac_in)
goto fail;
}
c->state = av_mallocz(channels * sizeof(*c->state));
if (!c->state)
goto fail;
c->channels = channels;
/* calculate thresholds for turning off dithering during periods of
silence to avoid replacing digital silence with quiet dither noise */
c->mute_dither_threshold = lrintf(sample_rate * MUTE_THRESHOLD_SEC);
c->mute_reset_threshold = c->mute_dither_threshold * 4;
/* initialize dither states */
av_lfg_init(&seed_gen, 0xC0FFEE);
for (ch = 0; ch < channels; ch++) {
DitherState *state = &c->state[ch];
state->mute = c->mute_reset_threshold + 1;
state->seed = av_lfg_get(&seed_gen);
generate_dither_noise(c, state, FFMAX(32768, sample_rate / 2));
}
return c;
fail:
ff_dither_free(&c);
return NULL;
}

88
libavresample/dither.h Normal file
View File

@ -0,0 +1,88 @@
/*
* Copyright (c) 2012 Justin Ruggles <justin.ruggles@gmail.com>
*
* 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 AVRESAMPLE_DITHER_H
#define AVRESAMPLE_DITHER_H
#include "avresample.h"
#include "audio_data.h"
typedef struct DitherContext DitherContext;
typedef struct DitherDSPContext {
/**
* Convert samples from flt to s16 with added dither noise.
*
* @param dst destination float array, range -0.5 to 0.5
* @param src source int array, range INT_MIN to INT_MAX.
* @param dither float dither noise array
* @param len number of samples
*/
void (*quantize)(int16_t *dst, const float *src, float *dither, int len);
int ptr_align; ///< src and dst constraits for quantize()
int samples_align; ///< len constraits for quantize()
/**
* Convert dither noise from int to float with triangular distribution.
*
* @param dst destination float array, range -0.5 to 0.5
* constraints: 32-byte aligned
* @param src0 source int array, range INT_MIN to INT_MAX.
* the array size is len * 2
* constraints: 32-byte aligned
* @param len number of output noise samples
* constraints: multiple of 16
*/
void (*dither_int_to_float)(float *dst, int *src0, int len);
} DitherDSPContext;
/**
* Allocate and initialize a DitherContext.
*
* The parameters in the AVAudioResampleContext are used to initialize the
* DitherContext.
*
* @param avr AVAudioResampleContext
* @return newly-allocated DitherContext
*/
DitherContext *ff_dither_alloc(AVAudioResampleContext *avr,
enum AVSampleFormat out_fmt,
enum AVSampleFormat in_fmt,
int channels, int sample_rate);
/**
* Free a DitherContext.
*
* @param c DitherContext
*/
void ff_dither_free(DitherContext **c);
/**
* Convert audio sample format with dithering.
*
* @param c DitherContext
* @param dst destination audio data
* @param src source audio data
* @return 0 if ok, negative AVERROR code on failure
*/
int ff_convert_dither(DitherContext *c, AudioData *dst, AudioData *src);
#endif /* AVRESAMPLE_DITHER_H */

1
libavresample/internal.h
View File

@ -53,6 +53,7 @@ struct AVAudioResampleContext {
double cutoff; /**< resampling cutoff frequency. 1.0 corresponds to half the output sample rate */
enum AVResampleFilterType filter_type; /**< resampling filter type */
int kaiser_beta; /**< beta value for Kaiser window (only applicable if filter_type == AV_FILTER_TYPE_KAISER) */
enum AVResampleDitherMethod dither_method; /**< dither method */
int in_channels; /**< number of input channels */
int out_channels; /**< number of output channels */

6
libavresample/options.c
View File

@ -63,6 +63,12 @@ static const AVOption options[] = {
{ "blackman_nuttall", "Blackman Nuttall Windowed Sinc", 0, AV_OPT_TYPE_CONST, { .i64 = AV_RESAMPLE_FILTER_TYPE_BLACKMAN_NUTTALL }, INT_MIN, INT_MAX, PARAM, "filter_type" },
{ "kaiser", "Kaiser Windowed Sinc", 0, AV_OPT_TYPE_CONST, { .i64 = AV_RESAMPLE_FILTER_TYPE_KAISER }, INT_MIN, INT_MAX, PARAM, "filter_type" },
{ "kaiser_beta", "Kaiser Window Beta", OFFSET(kaiser_beta), AV_OPT_TYPE_INT, { .i64 = 9 }, 2, 16, PARAM },
{ "dither_method", "Dither Method", OFFSET(dither_method), AV_OPT_TYPE_INT, { .i64 = AV_RESAMPLE_DITHER_NONE }, 0, AV_RESAMPLE_DITHER_NB-1, PARAM, "dither_method"},
{"none", "No Dithering", 0, AV_OPT_TYPE_CONST, { .i64 = AV_RESAMPLE_DITHER_NONE }, INT_MIN, INT_MAX, PARAM, "dither_method"},
{"rectangular", "Rectangular Dither", 0, AV_OPT_TYPE_CONST, { .i64 = AV_RESAMPLE_DITHER_RECTANGULAR }, INT_MIN, INT_MAX, PARAM, "dither_method"},
{"triangular", "Triangular Dither", 0, AV_OPT_TYPE_CONST, { .i64 = AV_RESAMPLE_DITHER_TRIANGULAR }, INT_MIN, INT_MAX, PARAM, "dither_method"},
{"triangular_hp", "Triangular Dither With High Pass", 0, AV_OPT_TYPE_CONST, { .i64 = AV_RESAMPLE_DITHER_TRIANGULAR_HP }, INT_MIN, INT_MAX, PARAM, "dither_method"},
{"triangular_ns", "Triangular Dither With Noise Shaping", 0, AV_OPT_TYPE_CONST, { .i64 = AV_RESAMPLE_DITHER_TRIANGULAR_NS }, INT_MIN, INT_MAX, PARAM, "dither_method"},
{ NULL },
};

10
libavresample/utils.c
View File

@ -142,7 +142,8 @@ int avresample_open(AVAudioResampleContext *avr)
/* setup contexts */
if (avr->in_convert_needed) {
avr->ac_in = ff_audio_convert_alloc(avr, avr->internal_sample_fmt,
avr->in_sample_fmt, avr->in_channels);
avr->in_sample_fmt, avr->in_channels,
avr->in_sample_rate);
if (!avr->ac_in) {
ret = AVERROR(ENOMEM);
goto error;
@ -155,7 +156,8 @@ int avresample_open(AVAudioResampleContext *avr)
else
src_fmt = avr->in_sample_fmt;
avr->ac_out = ff_audio_convert_alloc(avr, avr->out_sample_fmt, src_fmt,
avr->out_channels);
avr->out_channels,
avr->out_sample_rate);
if (!avr->ac_out) {
ret = AVERROR(ENOMEM);
goto error;
@ -190,8 +192,8 @@ void avresample_close(AVAudioResampleContext *avr)
ff_audio_data_free(&avr->out_buffer);
av_audio_fifo_free(avr->out_fifo);
avr->out_fifo = NULL;
av_freep(&avr->ac_in);
av_freep(&avr->ac_out);
ff_audio_convert_free(&avr->ac_in);
ff_audio_convert_free(&avr->ac_out);
ff_audio_resample_free(&avr->resample);
ff_audio_mix_free(&avr->am);
av_freep(&avr->mix_matrix);

2
libavresample/version.h
View File

@ -21,7 +21,7 @@
#define LIBAVRESAMPLE_VERSION_MAJOR 1
#define LIBAVRESAMPLE_VERSION_MINOR 0
#define LIBAVRESAMPLE_VERSION_MICRO 0
#define LIBAVRESAMPLE_VERSION_MICRO 1
#define LIBAVRESAMPLE_VERSION_INT AV_VERSION_INT(LIBAVRESAMPLE_VERSION_MAJOR, \
LIBAVRESAMPLE_VERSION_MINOR, \