mirror of
https://github.com/outbackdingo/UltraGrid.git
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147 lines
4.1 KiB
C
147 lines
4.1 KiB
C
/**
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* Copyright (c) 2011, CESNET z.s.p.o
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* Copyright (c) 2011, Silicon Genome, LLC.
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*
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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, are permitted provided that the following conditions are met:
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*
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* * 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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* * 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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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef GPUJPEG_WRITER_H
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#define GPUJPEG_WRITER_H
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#include <libgpujpeg/gpujpeg_type.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/** JPEG encoder structure predeclaration */
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struct gpujpeg_encoder;
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/** JPEG writer structure */
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struct gpujpeg_writer
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{
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// Output buffer
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uint8_t* buffer;
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// Output buffer current position
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uint8_t* buffer_current;
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// Segment info buffers (every buffer is placed inside another header)
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uint8_t* segment_info[GPUJPEG_MAX_SEGMENT_INFO_HEADER_COUNT];
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// Segment info buffers count (equals number of segment info headers)
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int segment_info_count;
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// Segment info current position in scan
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uint8_t* segment_info_position;
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// Segment info current segment index
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int segment_info_index;
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};
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/**
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* Create JPEG writer
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*
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* @return writer structure if succeeds, otherwise NULL
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*/
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struct gpujpeg_writer*
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gpujpeg_writer_create(struct gpujpeg_encoder* encoder);
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/**
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* Destroy JPEG writer
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*
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* @param writer Writer structure
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* @return 0 if succeeds, otherwise nonzero
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*/
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int
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gpujpeg_writer_destroy(struct gpujpeg_writer* writer);
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/**
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* Write one byte to file
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*
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* @param writer Writer structure
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* @param value Byte value to write
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* @return void
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*/
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#define gpujpeg_writer_emit_byte(writer, value) { \
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*writer->buffer_current = (uint8_t)(value); \
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writer->buffer_current++; }
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/**
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* Write two bytes to file
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*
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* @param writer Writer structure
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* @param value Two-byte value to write
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* @return void
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*/
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#define gpujpeg_writer_emit_2byte(writer, value) { \
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*writer->buffer_current = (uint8_t)(((value) >> 8) & 0xFF); \
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writer->buffer_current++; \
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*writer->buffer_current = (uint8_t)((value) & 0xFF); \
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writer->buffer_current++; }
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/**
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* Write marker to file
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*
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* @param writer Writer structure
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* @oaran marker Marker to write (JPEG_MARKER_...)
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* @return void
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*/
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#define gpujpeg_writer_emit_marker(writer, marker) { \
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*writer->buffer_current = 0xFF;\
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writer->buffer_current++; \
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*writer->buffer_current = (uint8_t)(marker); \
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writer->buffer_current++; }
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/**
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* Write JPEG header (write soi, app0, Y_dqt, CbCr_dqt, sof, 4 * dht blocks)
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*
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* @param encoder Encoder structure
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* @return void
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*/
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void
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gpujpeg_writer_write_header(struct gpujpeg_encoder* encoder);
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/**
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* Write segment info for current position in write buffer
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*
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* @param encoder Encoder structure
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* @return void
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*/
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void
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gpujpeg_writer_write_segment_info(struct gpujpeg_encoder* encoder);
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/**
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* Write scan header for one component
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*
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* @param encoder Encoder structure
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* @param scan_index Scan index
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* @return void
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*/
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void
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gpujpeg_writer_write_scan_header(struct gpujpeg_encoder* encoder, int scan_index);
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#ifdef __cplusplus
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}
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#endif
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#endif // GPUJPEG_WRITER_H
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