61 #define OFFSET(x) offsetof(ASoftClipContext, x) 62 #define A AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM 63 #define F AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM 116 void **dptr,
const void **sptr,
125 for (
int c = start;
c <
end;
c++) {
126 const float *
src = sptr[
c];
127 float *dst = dptr[
c];
131 for (
int n = 0; n < nb_samples; n++) {
132 dst[n] =
av_clipf(src[n] * factor, -1.
f, 1.
f);
137 for (
int n = 0; n < nb_samples; n++) {
138 dst[n] = tanhf(src[n] * factor * param);
143 for (
int n = 0; n < nb_samples; n++) {
144 dst[n] = 2.f /
M_PI *
atanf(src[n] * factor * param);
149 for (
int n = 0; n < nb_samples; n++) {
152 if (
FFABS(sample) >= 1.5
f)
155 dst[n] = sample - 0.1481f *
powf(sample, 3.
f);
160 for (
int n = 0; n < nb_samples; n++) {
161 dst[n] = 2.f / (1.f +
expf(-2.
f * src[n] * factor)) - 1.;
166 for (
int n = 0; n < nb_samples; n++) {
169 dst[n] = sample / (sqrtf(param + sample * sample));
174 for (
int n = 0; n < nb_samples; n++) {
177 if (
FFABS(sample) >= 1.25)
180 dst[n] = sample - 0.08192f *
powf(sample, 5.
f);
185 for (
int n = 0; n < nb_samples; n++) {
191 dst[n] =
sinf(sample);
196 for (
int n = 0; n < nb_samples; n++) {
197 dst[n] = erff(src[n] * factor);
208 void **dptr,
const void **sptr,
217 for (
int c = start;
c <
end;
c++) {
218 const double *
src = sptr[
c];
219 double *dst = dptr[
c];
223 for (
int n = 0; n < nb_samples; n++) {
224 dst[n] =
av_clipd(src[n] * factor, -1., 1.);
229 for (
int n = 0; n < nb_samples; n++) {
230 dst[n] = tanh(src[n] * factor * param);
235 for (
int n = 0; n < nb_samples; n++) {
236 dst[n] = 2. /
M_PI * atan(src[n] * factor * param);
241 for (
int n = 0; n < nb_samples; n++) {
244 if (
FFABS(sample) >= 1.5)
247 dst[n] = sample - 0.1481 * pow(sample, 3.);
252 for (
int n = 0; n < nb_samples; n++) {
253 dst[n] = 2. / (1. +
exp(-2. * src[n] * factor)) - 1.;
258 for (
int n = 0; n < nb_samples; n++) {
261 dst[n] = sample / (sqrt(param + sample * sample));
266 for (
int n = 0; n < nb_samples; n++) {
269 if (
FFABS(sample) >= 1.25)
272 dst[n] = sample - 0.08192 * pow(sample, 5.);
277 for (
int n = 0; n < nb_samples; n++) {
283 dst[n] = sin(sample);
288 for (
int n = 0; n < nb_samples; n++) {
289 dst[n] =
erf(src[n] * factor);
362 const int start = (channels * jobnr) / nb_jobs;
363 const int end = (channels * (jobnr+1)) / nb_jobs;
366 nb_samples, channels, start, end);
482 .priv_class = &asoftclip_class,
This structure describes decoded (raw) audio or video data.
static int config_input(AVFilterLink *inlink)
static double erf(double z)
erf function Algorithm taken from the Boost project, source: http://www.boost.org/doc/libs/1_46_1/boo...
static av_cold void uninit(AVFilterContext *ctx)
Main libavfilter public API header.
static const AVOption asoftclip_options[]
static const AVFilterPad outputs[]
static int query_formats(AVFilterContext *ctx)
#define AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC
Some filters support a generic "enable" expression option that can be used to enable or disable a fil...
const char * name
Pad name.
#define av_assert0(cond)
assert() equivalent, that is always enabled.
int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
Send a frame of data to the next filter.
av_cold struct SwrContext * swr_alloc(void)
Allocate SwrContext.
static av_cold int end(AVCodecContext *avctx)
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
int av_sample_fmt_is_planar(enum AVSampleFormat sample_fmt)
Check if the sample format is planar.
A filter pad used for either input or output.
A link between two filters.
libswresample public header
int sample_rate
samples per second
AVFrame * ff_get_audio_buffer(AVFilterLink *link, int nb_samples)
Request an audio samples buffer with a specific set of permissions.
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
The libswresample context.
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
int ff_filter_process_command(AVFilterContext *ctx, const char *cmd, const char *arg, char *res, int res_len, int flags)
Generic processing of user supplied commands that are set in the same way as the filter options...
void * priv
private data for use by the filter
#define AVFILTER_FLAG_SLICE_THREADS
The filter supports multithreading by splitting frames into multiple parts and processing them concur...
static const AVFilterPad inputs[]
int av_opt_set_int(void *obj, const char *name, int64_t val, int search_flags)
simple assert() macros that are a bit more flexible than ISO C assert().
static void filter_dbl(ASoftClipContext *s, void **dptr, const void **sptr, int nb_samples, int channels, int start, int end)
int channels
number of audio channels, only used for audio.
audio channel layout utility functions
int ff_filter_get_nb_threads(AVFilterContext *ctx)
Get number of threads for current filter instance.
static int process_command(AVFilterContext *ctx, const char *cmd, const char *args, char *res, int res_len, int flags)
typedef void(APIENTRY *FF_PFNGLACTIVETEXTUREPROC)(GLenum texture)
AVFILTER_DEFINE_CLASS(asoftclip)
#define FFABS(a)
Absolute value, Note, INT_MIN / INT64_MIN result in undefined behavior as they are not representable ...
int format
agreed upon media format
void(* filter)(struct ASoftClipContext *s, void **dst, const void **src, int nb_samples, int channels, int start, int end)
A list of supported channel layouts.
int format
format of the frame, -1 if unknown or unset Values correspond to enum AVPixelFormat for video frames...
AVSampleFormat
Audio sample formats.
int av_frame_is_writable(AVFrame *frame)
Check if the frame data is writable.
Used for passing data between threads.
av_cold void swr_free(SwrContext **ss)
Free the given SwrContext and set the pointer to NULL.
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(const uint8_t *) pi-0x80)*(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(const uint8_t *) pi-0x80)*(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(const int16_t *) pi >> 8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t,*(const int16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t,*(const int16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(const int32_t *) pi >> 24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t,*(const int32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t,*(const int32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(const float *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(const float *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(const float *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(const double *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(const double *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(const double *) pi *(1U<< 31))))#define SET_CONV_FUNC_GROUP(ofmt, ifmt) static void set_generic_function(AudioConvert *ac){}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 sample_rate, int apply_map){AudioConvert *ac;int in_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) return NULL;ac->avr=avr;ac->out_fmt=out_fmt;ac->in_fmt=in_fmt;ac->channels=channels;ac->apply_map=apply_map;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, apply_map);if(!ac->dc){av_free(ac);return NULL;}return ac;}in_planar=ff_sample_fmt_is_planar(in_fmt, channels);out_planar=ff_sample_fmt_is_planar(out_fmt, channels);if(in_planar==out_planar){ac->func_type=CONV_FUNC_TYPE_FLAT;ac->planes=in_planar?ac->channels:1;}else if(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;else ac->func_type=CONV_FUNC_TYPE_DEINTERLEAVE;set_generic_function(ac);if(ARCH_AARCH64) ff_audio_convert_init_aarch64(ac);if(ARCH_ARM) ff_audio_convert_init_arm(ac);if(ARCH_X86) ff_audio_convert_init_x86(ac);return ac;}int ff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in){int use_generic=1;int len=in->nb_samples;int p;if(ac->dc){av_log(ac->avr, AV_LOG_TRACE,"%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-> in
Describe the class of an AVClass context structure.
static const int factor[16]
const char * name
Filter name.
int attribute_align_arg swr_convert(struct SwrContext *s, uint8_t *out_arg[SWR_CH_MAX], int out_count, const uint8_t *in_arg[SWR_CH_MAX], int in_count)
AVFilterLink ** outputs
array of pointers to output links
enum MovChannelLayoutTag * layouts
#define flags(name, subs,...)
AVFilterInternal * internal
An opaque struct for libavfilter internal use.
The exact code depends on how similar the blocks are and how related they are to the and needs to apply these operations to the correct inlink or outlink if there are several Macros are available to factor that when no extra processing is inlink
uint64_t channel_layout
channel layout of current buffer (see libavutil/channel_layout.h)
avfilter_execute_func * execute
static void filter_flt(ASoftClipContext *s, void **dptr, const void **sptr, int nb_samples, int channels, int start, int end)
AVFilterContext * dst
dest filter
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
static int filter_channels(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
static enum AVSampleFormat sample_fmts[]
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later.That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another.Frame references ownership and permissions
uint8_t ** extended_data
pointers to the data planes/channels.
int av_opt_set_sample_fmt(void *obj, const char *name, enum AVSampleFormat fmt, int search_flags)
int nb_samples
number of audio samples (per channel) described by this frame
int av_frame_copy_props(AVFrame *dst, const AVFrame *src)
Copy only "metadata" fields from src to dst.
av_cold int swr_init(struct SwrContext *s)
Initialize context after user parameters have been set.