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357 lines
12 KiB
C
357 lines
12 KiB
C
/*
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* gstjpegparser.h - JPEG parser
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*
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* Copyright (C) 2011 Intel Corporation
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public License
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* as published by the Free Software Foundation; either version 2.1
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* of the License, or (at your option) any later version.
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*
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* This library 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 this library; if not, write to the Free
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* Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301 USA
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*/
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#ifndef GST_JPEG_PARSER_H
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#define GST_JPEG_PARSER_H
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#ifndef GST_USE_UNSTABLE_API
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# warning "The JPEG parsing library is unstable API and may change in future."
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# warning "You can define GST_USE_UNSTABLE_API to avoid this warning."
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#endif
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#include <gst/gst.h>
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G_BEGIN_DECLS
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/**
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* GST_JPEG_MAX_FRAME_COMPONENTS:
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*
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* Maximum number of image components in a frame (Nf).
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*/
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#define GST_JPEG_MAX_FRAME_COMPONENTS 256
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/**
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* GST_JPEG_MAX_SCAN_COMPONENTS:
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*
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* Maximum number of image components in a scan (Ns).
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*/
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#define GST_JPEG_MAX_SCAN_COMPONENTS 4
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/**
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* GST_JPEG_MAX_QUANT_ELEMENTS:
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*
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* Number of elements in the quantization table.
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*/
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#define GST_JPEG_MAX_QUANT_ELEMENTS 64
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typedef struct _GstJpegQuantTable GstJpegQuantTable;
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typedef struct _GstJpegHuffmanTable GstJpegHuffmanTable;
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typedef struct _GstJpegScanComponent GstJpegScanComponent;
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typedef struct _GstJpegScanHdr GstJpegScanHdr;
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typedef struct _GstJpegFrameComponent GstJpegFrameComponent;
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typedef struct _GstJpegFrameHdr GstJpegFrameHdr;
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typedef struct _GstJpegTypeOffsetSize GstJpegTypeOffsetSize;
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/**
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* GstJpegParserResult:
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* @GST_JPEG_PARSER_OK: The parsing succeeded
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* @GST_JPEG_PARSER_BROKEN_DATA: The data to parse is broken
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* @GST_JPEG_PARSER_NO_SCAN_FOUND: No scan found during the parsing
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* @GST_JPEG_PARSER_ERROR: An error occured while parsing
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*
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* The result of parsing JPEG data.
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*/
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typedef enum
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{
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GST_JPEG_PARSER_OK,
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GST_JPEG_PARSER_BROKEN_DATA,
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GST_JPEG_PARSER_NO_SCAN_FOUND,
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GST_JPEG_PARSER_ERROR,
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} GstJpegParserResult;
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/**
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* GstJpegMarkerCode:
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* @GST_JPEG_MARKER_SOF_MIN: Start of frame min marker code
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* @GST_JPEG_MARKER_SOF_MAX: Start of frame max marker code
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* @GST_JPEG_MARKER_DHT: Huffman tabler marker code
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* @GST_JPEG_MARKER_DAC: Arithmetic coding marker code
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* @GST_JPEG_MARKER_RST_MIN: Restart interval min marker code
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* @GST_JPEG_MARKER_RST_MAX: Restart interval max marker code
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* @GST_JPEG_MARKER_SOI: Start of image marker code
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* @GST_JPEG_MARKER_EOI: End of image marker code
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* @GST_JPEG_MARKER_SOS: Start of scan marker code
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* @GST_JPEG_MARKER_DQT: Define quantization table marker code
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* @GST_JPEG_MARKER_DNL: Define number of lines marker code
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* @GST_JPEG_MARKER_DRI: Define restart interval marker code
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* @GST_JPEG_MARKER_APP_MIN: Application segment min marker code
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* @GST_JPEG_MARKER_APP_MAX: Application segment max marker code
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* @GST_JPEG_MARKER_COM: Comment marker code
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*
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* Indicates the type of JPEG segment.
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*/
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typedef enum {
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GST_JPEG_MARKER_SOF_MIN = 0xC0,
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GST_JPEG_MARKER_SOF_MAX = 0xCF,
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GST_JPEG_MARKER_DHT = 0xC4,
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GST_JPEG_MARKER_DAC = 0xCC,
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GST_JPEG_MARKER_RST_MIN = 0xD0,
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GST_JPEG_MARKER_RST_MAX = 0xD7,
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GST_JPEG_MARKER_SOI = 0xD8,
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GST_JPEG_MARKER_EOI = 0xD9,
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GST_JPEG_MARKER_SOS = 0xDA,
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GST_JPEG_MARKER_DQT = 0xDB,
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GST_JPEG_MARKER_DNL = 0xDC,
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GST_JPEG_MARKER_DRI = 0xDD,
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GST_JPEG_MARKER_APP_MIN = 0xE0,
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GST_JPEG_MARKER_APP_MAX = 0xEF,
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GST_JPEG_MARKER_COM = 0xFE,
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} GstJpegMarkerCode;
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/**
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* GstJpegProfile:
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* @GST_JPEG_PROFILE_BASELINE: Baseline DCT
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* @GST_JPEG_PROFILE_EXTENDED: Extended sequential DCT
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* @GST_JPEG_PROFILE_PROGRESSIVE: Progressive DCT
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* @GST_JPEG_PROFILE_LOSSLESS: Lossless (sequential)
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* @GST_JPEG_PROFILE_ARITHMETIC: Flag for arithmetic coding
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*
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* JPEG encoding processes.
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*/
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typedef enum {
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GST_JPEG_PROFILE_BASELINE = 0x00,
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GST_JPEG_PROFILE_EXTENDED = 0x01,
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GST_JPEG_PROFILE_PROGRESSIVE = 0x02,
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GST_JPEG_PROFILE_LOSSLESS = 0x03,
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GST_JPEG_PROFILE_ARITHMETIC = 0x80
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} GstJpegProfile;
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/**
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* GstJpegQuantTable:
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* @quant_precision: Quantization table element precision (Pq)
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* @quant_table: Quantization table elements (Qk)
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*
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* Quantization table.
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*/
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struct _GstJpegQuantTable
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{
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guint8 quant_precision;
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guint16 quant_table[GST_JPEG_MAX_QUANT_ELEMENTS];
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};
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/**
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* GstJpegHuffmanTable:
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* @huf_bits: Number of Huffman codes of length i + 1 (Li)
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* @huf_vales: Value associated with each Huffman code (Vij)
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*
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* Huffman table.
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*/
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struct _GstJpegHuffmanTable
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{
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guint8 huf_bits[16];
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guint8 huf_values[256];
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};
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/**
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* GstJpegScanComponent:
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* @component_selector: Scan component selector (Csj)
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* @dc_selector: DC entropy coding table destination selector (Tdj)
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* @ac_selector: AC entropy coding table destination selector (Taj)
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* Component-specification parameters.
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*/
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struct _GstJpegScanComponent
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{
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guint8 component_selector; /* 0 .. 255 */
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guint8 dc_selector; /* 0 .. 3 */
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guint8 ac_selector; /* 0 .. 3 */
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};
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/**
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* GstJpegScanHdr:
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* @num_components: Number of image components in scan (Ns)
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* @components: Image components
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*
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* Scan header.
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*/
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struct _GstJpegScanHdr
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{
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guint8 num_components; /* 1 .. 4 */
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GstJpegScanComponent components[GST_JPEG_MAX_SCAN_COMPONENTS];
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};
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/**
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* GstJpegFrameComponent:
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* @identifier: Component identifier (Ci)
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* @horizontal_factor: Horizontal sampling factor (Hi)
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* @vertical_factor: Vertical sampling factor (Vi)
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* @quant_table_selector: Quantization table destination selector (Tqi)
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*
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* Component-specification parameters.
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*/
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struct _GstJpegFrameComponent
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{
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guint8 identifier; /* 0 .. 255 */
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guint8 horizontal_factor; /* 1 .. 4 */
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guint8 vertical_factor; /* 1 .. 4 */
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guint8 quant_table_selector; /* 0 .. 3 */
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};
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/**
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* GstJpegFrameHdr:
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* @profile: JPEG encoding process (see #GstJpegProfile)
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* @sample_precision: Sample precision (P)
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* @height: Number of lines (Y)
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* @width: Number of samples per line (X)
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* @num_components: Number of image components in frame (Nf)
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* @components: Image components
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* @restart_interval: Number of MCU in the restart interval (Ri)
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*
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* Frame header.
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*/
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struct _GstJpegFrameHdr
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{
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guint8 profile;
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guint8 sample_precision; /* 2 .. 16 */
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guint16 width; /* 1 .. 65535 */
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guint16 height; /* 0 .. 65535 */
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guint8 num_components; /* 1 .. 255 */
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GstJpegFrameComponent components[GST_JPEG_MAX_FRAME_COMPONENTS];
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};
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/**
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* GstJpegTypeOffsetSize:
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* @type: The type of the segment that starts at @offset
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* @offset: The offset to the segment start in bytes
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* @size: The size in bytes of the segment, or -1 if the end was not found
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*
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* A structure that contains the type of a segment, its offset and its size.
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*/
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struct _GstJpegTypeOffsetSize
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{
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guint8 type;
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guint offset;
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gint size;
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};
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/**
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* gst_jpeg_parse:
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* @data: The data to parse
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* @size: The size of @data
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* @offset: The offset from which to start parsing
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*
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* Parses the JPEG bitstream contained in @data, and returns the detected
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* segments as a newly-allocated list of #GstJpegTypeOffsetSize elements.
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* The caller is responsible for destroying the list when no longer needed.
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*
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* Returns: a #GList of #GstJpegTypeOffsetSize.
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*/
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GList *gst_jpeg_parse (const guint8 * data,
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gsize size,
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guint offset);
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/**
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* gst_jpeg_parse_frame_hdr:
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* @hdr: (out): The #GstJpegFrameHdr structure to fill in
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* @data: The data from which to parse the frame header
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* @size: The size of @data
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* @offset: The offset in bytes from which to start parsing @data
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*
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* Parses the @hdr JPEG frame header structure members from @data.
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*
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* Returns: a #GstJpegParserResult
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*/
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GstJpegParserResult gst_jpeg_parse_frame_hdr (GstJpegFrameHdr * hdr,
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const guint8 * data,
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gsize size,
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guint offset);
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/**
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* gst_jpeg_parse_scan_hdr:
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* @hdr: (out): The #GstJpegScanHdr structure to fill in
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* @data: The data from which to parse the scan header
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* @size: The size of @data
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* @offset: The offset in bytes from which to start parsing @data
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*
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* Parses the @hdr JPEG scan header structure members from @data.
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*
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* Returns: a #GstJpegParserResult
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*/
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GstJpegParserResult gst_jpeg_parse_scan_hdr (GstJpegScanHdr * hdr,
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const guint8 * data,
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gsize size,
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guint offset);
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/**
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* gst_jpeg_parse_quantization_table:
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* @quant_tables: (out): The #GstJpegQuantizationTable structure to fill in
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* @num_quant_tables: The number of allocated quantization tables in @quant_tables
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* @data: The data from which to parse the quantization table
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* @size: The size of @data
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* @offset: The offset in bytes from which to start parsing @data
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*
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* Parses the JPEG quantization table structure members from @data.
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*
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* Note: @quant_tables represents the user-allocated quantization
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* tables based on the number of scan components. That is, the parser
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* writes the output quantization table at the index specified by the
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* quantization table destination identifier (Tq). So, the array of
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* quantization tables shall be large enough to hold the table for the
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* last component.
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*
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* Returns: a #GstJpegParserResult
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*/
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GstJpegParserResult gst_jpeg_parse_quant_table (GstJpegQuantTable *quant_tables,
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guint num_quant_tables,
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const guint8 * data,
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gsize size,
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guint offset);
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/**
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* gst_jpeg_parse_huffman_table:
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* @huf_tables: (out): The #GstJpegHuffmanTable structure to fill in
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* @num_huf_tables: The number of allocated Huffman tables in @huf_tables
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* @data: The data from which to parse the Huffman table
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* @size: The size of @data
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* @offset: The offset in bytes from which to start parsing @data
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*
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* Parses the JPEG Huffman table structure members from @data.
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*
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* Note: @huf_tables represents the user-allocated Huffman tables
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* based on the number of scan components. That is, the parser writes
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* the output Huffman table at the index specified by the Huffman
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* table destination identifier (Th). So, the array of Huffman tables
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* shall be large enough to hold the table for the last component.
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*
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* Returns: a #GstJpegParserResult
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*/
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GstJpegParserResult gst_jpeg_parse_huffman_table (GstJpegHuffmanTable *huf_tables,
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guint num_huf_tables,
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const guint8 * data,
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gsize size,
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guint offset);
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/**
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* gst_jpeg_parse_restart_interval:
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* @interval: (out): The parsed restart interval value
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* @data: The data from which to parse the restart interval specification
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* @size: The size of @data
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* @offset: The offset in bytes from which to start parsing @data
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*
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* Returns: a #GstJpegParserResult
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*/
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GstJpegParserResult gst_jpeg_parse_restart_interval (guint * interval,
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const guint8 * data,
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gsize size,
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guint offset);
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G_END_DECLS
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#endif /* GST_JPEG_PARSER_H */
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