136 lines
5 KiB
C
136 lines
5 KiB
C
/*
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* BPG decoder
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*
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* Copyright (c) 2014 Fabrice Bellard
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#ifndef _LIBBPG_H
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#define _LIBBPG_H
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typedef struct BPGDecoderContext BPGDecoderContext;
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typedef enum {
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BPG_FORMAT_GRAY,
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BPG_FORMAT_420, /* chroma at offset (0.5, 0.5) (JPEG) */
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BPG_FORMAT_422, /* chroma at offset (0.5, 0) (JPEG) */
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BPG_FORMAT_444,
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BPG_FORMAT_420_VIDEO, /* chroma at offset (0, 0.5) (MPEG2) */
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BPG_FORMAT_422_VIDEO, /* chroma at offset (0, 0) (MPEG2) */
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} BPGImageFormatEnum;
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typedef enum {
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BPG_CS_YCbCr,
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BPG_CS_RGB,
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BPG_CS_YCgCo,
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BPG_CS_YCbCr_BT709,
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BPG_CS_YCbCr_BT2020,
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BPG_CS_COUNT,
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} BPGColorSpaceEnum;
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typedef struct {
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uint32_t width;
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uint32_t height;
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uint8_t format; /* see BPGImageFormatEnum */
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uint8_t has_alpha; /* TRUE if an alpha plane is present */
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uint8_t color_space; /* see BPGColorSpaceEnum */
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uint8_t bit_depth;
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uint8_t premultiplied_alpha; /* TRUE if the color is alpha premultiplied */
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uint8_t has_w_plane; /* TRUE if a W plane is present (for CMYK encoding) */
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uint8_t limited_range; /* TRUE if limited range for the color */
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uint8_t has_animation; /* TRUE if the image contains animations */
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uint16_t loop_count; /* animations: number of loop, 0 = infinity */
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} BPGImageInfo;
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typedef enum {
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BPG_EXTENSION_TAG_EXIF = 1,
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BPG_EXTENSION_TAG_ICCP = 2,
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BPG_EXTENSION_TAG_XMP = 3,
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BPG_EXTENSION_TAG_THUMBNAIL = 4,
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BPG_EXTENSION_TAG_ANIM_CONTROL = 5,
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} BPGExtensionTagEnum;
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typedef struct BPGExtensionData {
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BPGExtensionTagEnum tag;
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uint32_t buf_len;
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uint8_t *buf;
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struct BPGExtensionData *next;
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} BPGExtensionData;
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typedef enum {
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BPG_OUTPUT_FORMAT_RGB24,
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BPG_OUTPUT_FORMAT_RGBA32, /* not premultiplied alpha */
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BPG_OUTPUT_FORMAT_RGB48,
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BPG_OUTPUT_FORMAT_RGBA64, /* not premultiplied alpha */
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BPG_OUTPUT_FORMAT_CMYK32,
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BPG_OUTPUT_FORMAT_CMYK64,
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} BPGDecoderOutputFormat;
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#define BPG_DECODER_INFO_BUF_SIZE 16
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BPGDecoderContext *bpg_decoder_open(void);
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/* If enable is true, extension data are kept during the image
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decoding and can be accessed after bpg_decoder_decode() with
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bpg_decoder_get_extension(). By default, the extension data are
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discarded. */
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void bpg_decoder_keep_extension_data(BPGDecoderContext *s, int enable);
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/* return 0 if 0K, < 0 if error */
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int bpg_decoder_decode(BPGDecoderContext *s, const uint8_t *buf, int buf_len);
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/* Return the first element of the extension data list */
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BPGExtensionData *bpg_decoder_get_extension_data(BPGDecoderContext *s);
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/* return 0 if 0K, < 0 if error */
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int bpg_decoder_get_info(BPGDecoderContext *s, BPGImageInfo *p);
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/* return 0 if 0K, < 0 if error */
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int bpg_decoder_start(BPGDecoderContext *s, BPGDecoderOutputFormat out_fmt);
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/* return the frame delay for animations as a fraction (*pnum) / (*pden)
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in seconds. In case there is no animation, 0 / 1 is returned. */
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void bpg_decoder_get_frame_duration(BPGDecoderContext *s, int *pnum, int *pden);
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/* return 0 if 0K, < 0 if error */
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int bpg_decoder_get_line(BPGDecoderContext *s, void *buf);
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void bpg_decoder_close(BPGDecoderContext *s);
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/* only useful for low level access to the image data */
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uint8_t *bpg_decoder_get_data(BPGDecoderContext *s, int *pline_size, int plane);
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/* Get information from the start of the image data in 'buf' (at least
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min(BPG_DECODER_INFO_BUF_SIZE, file_size) bytes must be given).
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If pfirst_md != NULL, the extension data are also parsed and the
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first element of the list is returned in *pfirst_md. The list must
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be freed with bpg_decoder_free_extension_data().
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BPGImageInfo.loop_count is only set if extension data are parsed.
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Return 0 if OK, < 0 if unrecognized data. */
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int bpg_decoder_get_info_from_buf(BPGImageInfo *p,
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BPGExtensionData **pfirst_md,
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const uint8_t *buf, int buf_len);
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/* Free the extension data returned by bpg_decoder_get_info_from_buf() */
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void bpg_decoder_free_extension_data(BPGExtensionData *first_md);
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#endif /* _LIBBPG_H */
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