mirror of
https://github.com/outbackdingo/UltraGrid.git
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0db80ba471
- allow reading up to 4 quantization tables (extended mode) - check errors (unsupported/wrong precision)
100 lines
3.4 KiB
C++
100 lines
3.4 KiB
C++
/**
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* @file utils/jpeg_reader.h
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* @author Martin Pulec <pulec@cesnet.cz>
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*/
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/*
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* Copyright (c) 2018 CESNET, z. s. p. o.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, is permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of CESNET nor the names of its contributors may be
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* used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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* EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef UTILS_JPEG_READER_H_
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#define UTILS_JPEG_READER_H_
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#ifndef __cplusplus
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#include <stdbool.h>
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#include <stdint.h>
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#else
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#include <cstdint>
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#endif
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enum jpeg_color_spec {
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JPEG_COLOR_SPEC_NONE = 0,
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JPEG_COLOR_SPEC_YCBCR,
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JPEG_COLOR_SPEC_RGB,
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JPEG_COLOR_SPEC_CMYK,
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JPEG_COLOR_SPEC_YCCK
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};
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enum {
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JPEG_MAX_COMPONENT_COUNT = 4,
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};
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struct jpeg_info {
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int width, height, comp_count;
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enum jpeg_color_spec color_spec;
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bool interleaved;
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int sampling_factor_v[JPEG_MAX_COMPONENT_COUNT];
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int sampling_factor_h[JPEG_MAX_COMPONENT_COUNT];
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int restart_interval; // content of DRI marker
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uint8_t *quantization_tables[JPEG_MAX_COMPONENT_COUNT];
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/// mapping component -> index to table_quantization
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int comp_table_quantization_map[JPEG_MAX_COMPONENT_COUNT];
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uint8_t *data; // entropy-coded segment start
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char com[65536 - 2 + 1]; // comment (COM marker)
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uint8_t huff_lum_dc[16 + 256]; // if first byte is 255, table was not defined
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uint8_t huff_lum_ac[16 + 256];
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uint8_t huff_chm_dc[16 + 256];
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uint8_t huff_chm_ac[16 + 256];
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};
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struct jpeg_rtp_data {
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int width, height;
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int type; // RTP JPEG type
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int q; // either 0..100 or 255 (dynamic QT - included in quantization_tables)
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int restart_interval; // content of DRI marker
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uint8_t *quantization_tables[2]; // assuming 8-bit tables
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uint8_t *data; // entropy-coded data start
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};
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#ifdef __cplusplus
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extern "C" {
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#endif // defined __cplusplus
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int jpeg_read_info(uint8_t *image, int len, struct jpeg_info *info);
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bool jpeg_get_rtp_hdr_data(uint8_t *jpeg_data, int len, struct jpeg_rtp_data *hdr_data);
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#ifdef __cplusplus
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}
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#endif // defined __cplusplus
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#endif// UTILS_JPEG_READER_H_
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