FFmpeg
tx.h
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1 /*
2  * This file is part of FFmpeg.
3  *
4  * FFmpeg is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * FFmpeg is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with FFmpeg; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17  */
18 
19 #ifndef AVUTIL_TX_H
20 #define AVUTIL_TX_H
21 
22 #include <stdint.h>
23 #include <stddef.h>
24 
25 typedef struct AVTXContext AVTXContext;
26 
27 typedef struct AVComplexFloat {
28  float re, im;
30 
31 typedef struct AVComplexDouble {
32  double re, im;
34 
35 typedef struct AVComplexInt32 {
38 
39 enum AVTXType {
40  /**
41  * Standard complex to complex FFT with sample data type AVComplexFloat.
42  * Output is not 1/len normalized. Scaling currently unsupported.
43  * The stride parameter is ignored.
44  */
46  /**
47  * Standard MDCT with sample data type of float and a scale type of
48  * float. Length is the frame size, not the window size (which is 2x frame)
49  * For forward transforms, the stride specifies the spacing between each
50  * sample in the output array in bytes. The input must be a flat array.
51  * For inverse transforms, the stride specifies the spacing between each
52  * sample in the input array in bytes. The output will be a flat array.
53  * Stride must be a non-zero multiple of sizeof(float).
54  */
56  /**
57  * Same as AV_TX_FLOAT_FFT with a data type of AVComplexDouble.
58  */
60  /**
61  * Same as AV_TX_FLOAT_MDCT with data and scale type of double.
62  * Stride must be a non-zero multiple of sizeof(double).
63  */
65  /**
66  * Same as AV_TX_FLOAT_FFT with a data type of AVComplexInt32.
67  */
69  /**
70  * Same as AV_TX_FLOAT_MDCT with data type of int32_t and scale type of float.
71  * Only scale values less than or equal to 1.0 are supported.
72  * Stride must be a non-zero multiple of sizeof(int32_t).
73  */
75 };
76 
77 /**
78  * Function pointer to a function to perform the transform.
79  *
80  * @note Using a different context than the one allocated during av_tx_init()
81  * is not allowed.
82  *
83  * @param s the transform context
84  * @param out the output array
85  * @param in the input array
86  * @param stride the input or output stride in bytes
87  *
88  * The out and in arrays must be aligned to the maximum required by the CPU
89  * architecture.
90  * The stride must follow the constraints the transform type has specified.
91  */
92 typedef void (*av_tx_fn)(AVTXContext *s, void *out, void *in, ptrdiff_t stride);
93 
94 /**
95  * Initialize a transform context with the given configuration
96  * Currently power of two lengths from 2 to 131072 are supported, along with
97  * any length decomposable to a power of two and either 3, 5 or 15.
98  *
99  * @param ctx the context to allocate, will be NULL on error
100  * @param tx pointer to the transform function pointer to set
101  * @param type type the type of transform
102  * @param inv whether to do an inverse or a forward transform
103  * @param len the size of the transform in samples
104  * @param scale pointer to the value to scale the output if supported by type
105  * @param flags currently unused
106  *
107  * @return 0 on success, negative error code on failure
108  */
110  int inv, int len, const void *scale, uint64_t flags);
111 
112 /**
113  * Frees a context and sets ctx to NULL, does nothing when ctx == NULL
114  */
116 
117 #endif /* AVUTIL_TX_H */
GLint GLenum type
Definition: opengl_enc.c:104
float re
Definition: tx.h:28
Same as AV_TX_FLOAT_FFT with a data type of AVComplexInt32.
Definition: tx.h:68
void(* av_tx_fn)(AVTXContext *s, void *out, void *in, ptrdiff_t stride)
Function pointer to a function to perform the transform.
Definition: tx.h:92
AVTXType
Definition: tx.h:39
Same as AV_TX_FLOAT_FFT with a data type of AVComplexDouble.
Definition: tx.h:59
Standard complex to complex FFT with sample data type AVComplexFloat.
Definition: tx.h:45
double re
Definition: tx.h:32
typedef void(APIENTRY *FF_PFNGLACTIVETEXTUREPROC)(GLenum texture)
int32_t
AVFormatContext * ctx
Definition: movenc.c:48
#define s(width, name)
Definition: cbs_vp9.c:257
void av_tx_uninit(AVTXContext **ctx)
Frees a context and sets ctx to NULL, does nothing when ctx == NULL.
Definition: tx.c:110
float im
Definition: tx.h:28
int av_tx_init(AVTXContext **ctx, av_tx_fn *tx, enum AVTXType type, int inv, int len, const void *scale, uint64_t flags)
Initialize a transform context with the given configuration Currently power of two lengths from 2 to ...
Definition: tx.c:123
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
#define flags(name, subs,...)
Definition: cbs_av1.c:560
int32_t re
Definition: tx.h:36
Standard MDCT with sample data type of float and a scale type of float.
Definition: tx.h:55
int len
Same as AV_TX_FLOAT_MDCT with data and scale type of double.
Definition: tx.h:64
Same as AV_TX_FLOAT_MDCT with data type of int32_t and scale type of float.
Definition: tx.h:74
FILE * out
Definition: movenc.c:54
#define stride