L4T Multimedia API Reference

28.2 Release

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NvJpegEncoder.h
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1 /*
2  * Copyright (c) 2016-2017, NVIDIA CORPORATION. All rights reserved.
3  *
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28 
36 #ifndef __NV_JPEG_ENCODER_H__
37 #define __NV_JPEG_ENCODER_H__
38 
51 #ifndef TEGRA_ACCELERATE
52 
56 #define TEGRA_ACCELERATE
57 #endif
58 
59 #include <stdio.h>
60 #include "jpeglib.h"
61 #include "NvElement.h"
62 #include "NvBuffer.h"
63 
64 #ifndef MAX_CHANNELS
65 
69 #define MAX_CHANNELS 3
70 #endif
71 
86 {
87 public:
94  static NvJPEGEncoder *createJPEGEncoder(const char *comp_name);
96 
118  int encodeFromFd(int fd, J_COLOR_SPACE color_space,
119  unsigned char **out_buf, unsigned long &out_buf_size,
120  int quality = 75);
121 
147  int encodeFromBuffer(NvBuffer & buffer, J_COLOR_SPACE color_space,
148  unsigned char **out_buf, unsigned long &out_buf_size,
149  int quality = 75);
150 
165  void setCropRect(uint32_t left, uint32_t top, uint32_t width,
166  uint32_t height);
167 
168 
177  void setScaledEncodeParams(uint32_t scale_width, uint32_t scale_height);
178 
179 private:
180 
181  NvJPEGEncoder(const char *comp_name);
182  struct jpeg_compress_struct cinfo;
183  struct jpeg_error_mgr jerr;
184 
185  static const NvElementProfiler::ProfilerField valid_fields =
188 };
189 #endif
190 
int encodeFromFd(int fd, J_COLOR_SPACE color_space, unsigned char **out_buf, unsigned long &out_buf_size, int quality=75)
Encodes a JPEG image from a file descriptor (FD) of hardware buffer memory.
NVIDIA Multimedia API: NvElement Base Class
static const ProfilerField PROFILER_FIELD_TOTAL_UNITS
Class representing a buffer.
Definition: NvBuffer.h:85
NVIDIA Multimedia API: Buffer API
Every element has a unique name that can be used for identifying the element in debug logs...
Definition: NvElement.h:63
const char * comp_name
Specifies the name of the component, for debugging.
Definition: NvElement.h:122
static NvJPEGEncoder * createJPEGEncoder(const char *comp_name)
Creates a new JPEG encoder named comp_name.
int encodeFromBuffer(NvBuffer &buffer, J_COLOR_SPACE color_space, unsigned char **out_buf, unsigned long &out_buf_size, int quality=75)
Encodes a JPEG image from software buffer memory.
void setCropRect(uint32_t left, uint32_t top, uint32_t width, uint32_t height)
Sets the cropping rectangle used by the JPEG encoder.
void setScaledEncodeParams(uint32_t scale_width, uint32_t scale_height)
Sets scaling parameters by which image needs to be scaled and encoded.
NvJpegEncoder uses the libjpeg APIs for decoding JPEG images.
Definition: NvJpegEncoder.h:85
static const ProfilerField PROFILER_FIELD_LATENCIES